"use client";

import { getMediaType } from "@archestra/shared";
import type { ChatStatus, FileUIPart } from "ai";
import {
  CornerDownLeftIcon,
  FileTextIcon,
  ImageIcon,
  Loader2Icon,
  Maximize2Icon,
  MicIcon,
  Minimize2Icon,
  PaperclipIcon,
  PlusIcon,
  SquareIcon,
  XIcon,
} from "lucide-react";
import { nanoid } from "nanoid";
import {
  type ChangeEvent,
  type ChangeEventHandler,
  Children,
  type ClipboardEventHandler,
  type ComponentProps,
  createContext,
  type FormEvent,
  type FormEventHandler,
  Fragment,
  type HTMLAttributes,
  type KeyboardEventHandler,
  type PropsWithChildren,
  type ReactNode,
  type RefObject,
  useCallback,
  useContext,
  useEffect,
  useMemo,
  useRef,
  useState,
} from "react";
import { Button } from "@/components/ui/button";
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
  CommandSeparator,
} from "@/components/ui/command";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import {
  HoverCard,
  HoverCardContent,
  HoverCardTrigger,
} from "@/components/ui/hover-card";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupTextarea,
} from "@/components/ui/input-group";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  getAttachmentFallbackLabel,
  isCsvAttachment,
  isPlainTextAttachment,
} from "@/lib/chat/chat-attachment-display";
import { useIsMobile } from "@/lib/hooks/use-mobile";
import { cn } from "@/lib/utils";

// ============================================================================
// Provider Context & Types
// ============================================================================

export type AttachmentsContext = {
  files: (FileUIPart & { id: string })[];
  add: (files: File[] | FileList) => void;
  remove: (id: string) => void;
  clear: () => void;
  openFileDialog: () => void;
  fileInputRef: RefObject<HTMLInputElement | null>;
};

export type TextInputContext = {
  value: string;
  setInput: (v: string) => void;
  clear: () => void;
};

export type PromptInputControllerProps = {
  textInput: TextInputContext;
  attachments: AttachmentsContext;
  /** INTERNAL: Allows PromptInput to register its file textInput + "open" callback */
  __registerFileInput: (
    ref: RefObject<HTMLInputElement | null>,
    open: () => void,
  ) => void;
};

const PromptInputController = createContext<PromptInputControllerProps | null>(
  null,
);
const ProviderAttachmentsContext = createContext<AttachmentsContext | null>(
  null,
);

export const usePromptInputController = () => {
  const ctx = useContext(PromptInputController);
  if (!ctx) {
    throw new Error(
      "Wrap your component inside <PromptInputProvider> to use usePromptInputController().",
    );
  }
  return ctx;
};

// Optional variants (do NOT throw). Useful for dual-mode components.
const useOptionalPromptInputController = () =>
  useContext(PromptInputController);

export const useProviderAttachments = () => {
  const ctx = useContext(ProviderAttachmentsContext);
  if (!ctx) {
    throw new Error(
      "Wrap your component inside <PromptInputProvider> to use useProviderAttachments().",
    );
  }
  return ctx;
};

const useOptionalProviderAttachments = () =>
  useContext(ProviderAttachmentsContext);

export type PromptInputProviderProps = PropsWithChildren<{
  initialInput?: string;
  maxFileSize?: number;
  /**
   * Per-file policy check beyond the MIME `accept` and `maxFileSize` constraints.
   * Returns a human-readable reason to reject the file, or null to accept it.
   * Rejected files are dropped and reported via `onError` with code `rejected`.
   */
  validateFile?: (file: File) => string | null;
  onError?: (err: {
    code: "max_files" | "max_file_size" | "accept" | "rejected";
    message: string;
  }) => void;
}>;

/**
 * Optional global provider that lifts PromptInput state outside of PromptInput.
 * If you don't use it, PromptInput stays fully self-managed.
 */
export function PromptInputProvider({
  initialInput: initialTextInput = "",
  maxFileSize,
  validateFile,
  onError,
  children,
}: PromptInputProviderProps) {
  // ----- textInput state
  const [textInput, setTextInput] = useState(initialTextInput);
  const clearInput = useCallback(() => setTextInput(""), []);

  // ----- attachments state (global when wrapped)
  const [attachmentFiles, setAttachmentFiles] = useState<
    (FileUIPart & { id: string })[]
  >([]);
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const openRef = useRef<() => void>(() => {});

  const add = useCallback(
    (files: File[] | FileList) => {
      const incoming = Array.from(files);
      if (incoming.length === 0) {
        return;
      }

      let accepted = incoming;
      if (maxFileSize) {
        accepted = incoming.filter((f) => f.size <= maxFileSize);
        if (incoming.length > 0 && accepted.length === 0) {
          onError?.({
            code: "max_file_size",
            message: "All files exceed the maximum size.",
          });
          return;
        }
        if (accepted.length < incoming.length) {
          onError?.({
            code: "max_file_size",
            message: "Some files exceed the maximum size.",
          });
        }
      }

      if (validateFile) {
        accepted = accepted.filter((f) => {
          const rejection = validateFile(f);
          if (rejection) {
            onError?.({ code: "rejected", message: rejection });
            return false;
          }
          return true;
        });
        if (accepted.length === 0) {
          return;
        }
      }

      setAttachmentFiles((prev) =>
        prev.concat(
          accepted.map((file) => ({
            id: nanoid(),
            type: "file" as const,
            url: URL.createObjectURL(file),
            mediaType: getMediaType(file),
            filename: file.name,
          })),
        ),
      );
    },
    [maxFileSize, validateFile, onError],
  );

  const remove = useCallback((id: string) => {
    setAttachmentFiles((prev) => {
      const found = prev.find((f) => f.id === id);
      if (found?.url) {
        URL.revokeObjectURL(found.url);
      }
      return prev.filter((f) => f.id !== id);
    });
  }, []);

  const clear = useCallback(() => {
    setAttachmentFiles((prev) => {
      for (const f of prev) {
        if (f.url) {
          URL.revokeObjectURL(f.url);
        }
      }
      return [];
    });
  }, []);

  // Keep a ref to attachments for cleanup on unmount (avoids stale closure)
  const attachmentsRef = useRef(attachmentFiles);
  attachmentsRef.current = attachmentFiles;

  // Cleanup blob URLs on unmount to prevent memory leaks
  useEffect(() => {
    return () => {
      for (const f of attachmentsRef.current) {
        if (f.url) {
          URL.revokeObjectURL(f.url);
        }
      }
    };
  }, []);

  const openFileDialog = useCallback(() => {
    openRef.current?.();
  }, []);

  const attachments = useMemo<AttachmentsContext>(
    () => ({
      files: attachmentFiles,
      add,
      remove,
      clear,
      openFileDialog,
      fileInputRef,
    }),
    [attachmentFiles, add, remove, clear, openFileDialog],
  );

  const __registerFileInput = useCallback(
    (ref: RefObject<HTMLInputElement | null>, open: () => void) => {
      fileInputRef.current = ref.current;
      openRef.current = open;
    },
    [],
  );

  const controller = useMemo<PromptInputControllerProps>(
    () => ({
      textInput: {
        value: textInput,
        setInput: setTextInput,
        clear: clearInput,
      },
      attachments,
      __registerFileInput,
    }),
    [textInput, clearInput, attachments, __registerFileInput],
  );

  return (
    <PromptInputController.Provider value={controller}>
      <ProviderAttachmentsContext.Provider value={attachments}>
        {children}
      </ProviderAttachmentsContext.Provider>
    </PromptInputController.Provider>
  );
}

// ============================================================================
// Component Context & Hooks
// ============================================================================

const LocalAttachmentsContext = createContext<AttachmentsContext | null>(null);

export const usePromptInputAttachments = () => {
  // Dual-mode: prefer provider if present, otherwise use local
  const provider = useOptionalProviderAttachments();
  const local = useContext(LocalAttachmentsContext);
  const context = provider ?? local;
  if (!context) {
    throw new Error(
      "usePromptInputAttachments must be used within a PromptInput or PromptInputProvider",
    );
  }
  return context;
};

export type PromptInputAttachmentProps = HTMLAttributes<HTMLDivElement> & {
  data: FileUIPart & { id: string };
  className?: string;
};

export function PromptInputAttachment({
  data,
  className,
  ...props
}: PromptInputAttachmentProps) {
  const attachments = usePromptInputAttachments();

  const filename = data.filename || "";

  const mediaType =
    data.mediaType?.startsWith("image/") && data.url ? "image" : "file";
  const isImage = mediaType === "image";
  const isTextDocument =
    isCsvAttachment(data.mediaType, filename) ||
    isPlainTextAttachment(data.mediaType, filename);

  const attachmentLabel =
    filename ||
    (isImage
      ? "Image"
      : getAttachmentFallbackLabel({ mediaType: data.mediaType, filename }));

  return (
    <PromptInputHoverCard>
      <HoverCardTrigger asChild>
        <div
          className={cn(
            "group relative flex h-8 cursor-pointer select-none items-center gap-1.5 rounded-md border border-border px-1.5 pr-1 font-medium text-sm transition-all hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
            className,
          )}
          key={data.id}
          {...props}
        >
          <div className="size-5 shrink-0 flex items-center justify-center overflow-hidden rounded bg-background">
            {isImage ? (
              <img
                alt={filename || "attachment"}
                className="size-5 object-cover"
                height={20}
                src={data.url}
                width={20}
              />
            ) : isTextDocument ? (
              <div className="flex size-5 items-center justify-center text-muted-foreground">
                <FileTextIcon className="size-3" />
              </div>
            ) : (
              <div className="flex size-5 items-center justify-center text-muted-foreground">
                <PaperclipIcon className="size-3" />
              </div>
            )}
          </div>

          <span className="flex-1 truncate">{attachmentLabel}</span>

          <Button
            aria-label="Remove attachment"
            className="size-5 shrink-0 cursor-pointer rounded p-0 opacity-60 hover:opacity-100 transition-opacity [&>svg]:size-3"
            onClick={(e) => {
              e.stopPropagation();
              attachments.remove(data.id);
            }}
            type="button"
            variant="ghost"
          >
            <XIcon />
            <span className="sr-only">Remove</span>
          </Button>
        </div>
      </HoverCardTrigger>
      <PromptInputHoverCardContent className="w-auto p-2">
        <div className="w-auto space-y-3">
          {isImage && (
            <div className="flex max-h-96 w-96 items-center justify-center overflow-hidden rounded-md border">
              <img
                alt={filename || "attachment preview"}
                className="max-h-full max-w-full object-contain"
                height={384}
                src={data.url}
                width={448}
              />
            </div>
          )}
          <div className="flex items-center gap-2.5">
            <div className="min-w-0 flex-1 space-y-1 px-0.5">
              <h4 className="truncate font-semibold text-sm leading-none">
                {attachmentLabel}
              </h4>
              {data.mediaType && (
                <p className="truncate font-mono text-muted-foreground text-xs">
                  {data.mediaType}
                </p>
              )}
            </div>
          </div>
        </div>
      </PromptInputHoverCardContent>
    </PromptInputHoverCard>
  );
}

export type PromptInputAttachmentsProps = Omit<
  HTMLAttributes<HTMLDivElement>,
  "children"
> & {
  children: (attachment: FileUIPart & { id: string }) => ReactNode;
};

export function PromptInputAttachments({
  children,
  className,
  ...props
}: PromptInputAttachmentsProps) {
  const attachments = usePromptInputAttachments();

  if (!attachments.files.length) {
    return null;
  }

  return (
    <div
      className={cn(
        "flex flex-wrap items-center gap-2 px-3 pt-1 pb-0 w-full",
        className,
      )}
      {...props}
    >
      {attachments.files.map((file) => (
        <Fragment key={file.id}>{children(file)}</Fragment>
      ))}
    </div>
  );
}

export type PromptInputActionAddAttachmentsProps = ComponentProps<
  typeof DropdownMenuItem
> & {
  label?: string;
};

export const PromptInputActionAddAttachments = ({
  label = "Add photos or files",
  ...props
}: PromptInputActionAddAttachmentsProps) => {
  const attachments = usePromptInputAttachments();

  return (
    <DropdownMenuItem
      {...props}
      onSelect={(e) => {
        e.preventDefault();
        attachments.openFileDialog();
      }}
    >
      <ImageIcon className="mr-2 size-4" /> {label}
    </DropdownMenuItem>
  );
};

export type PromptInputMessage = {
  text: string;
  files: FileUIPart[];
};

export type PromptInputProps = Omit<
  HTMLAttributes<HTMLFormElement>,
  "onSubmit" | "onError"
> & {
  accept?: string; // e.g., "image/*" or leave undefined for any
  multiple?: boolean;
  // When true, accepts drops anywhere on document. Default false (opt-in).
  globalDrop?: boolean;
  // Render a hidden input with given name and keep it in sync for native form posts. Default false.
  syncHiddenInput?: boolean;
  // Minimal constraints
  maxFiles?: number;
  maxFileSize?: number; // bytes
  onError?: (err: {
    code: "max_files" | "max_file_size" | "accept";
    message: string;
  }) => void;
  /**
   * When false, keep user input intact after submit.
   * Useful for actions like Stop where the text should remain.
   */
  clearOnSubmit?: boolean;
  onSubmit: (
    message: PromptInputMessage,
    event: FormEvent<HTMLFormElement>,
  ) => void | Promise<void>;
};

export const PromptInput = ({
  className,
  accept,
  multiple,
  globalDrop,
  syncHiddenInput,
  maxFiles,
  maxFileSize,
  onError,
  onSubmit,
  clearOnSubmit = true,
  children,
  ...props
}: PromptInputProps) => {
  // Try to use a provider controller if present
  const controller = useOptionalPromptInputController();
  const usingProvider = !!controller;

  // Refs
  const inputRef = useRef<HTMLInputElement | null>(null);
  const formRef = useRef<HTMLFormElement | null>(null);

  // ----- Local attachments (only used when no provider)
  const [items, setItems] = useState<(FileUIPart & { id: string })[]>([]);
  const files = usingProvider ? controller.attachments.files : items;

  // Keep a ref to files for cleanup on unmount (avoids stale closure)
  const filesRef = useRef(files);
  filesRef.current = files;

  const openFileDialogLocal = useCallback(() => {
    inputRef.current?.click();
  }, []);

  const matchesAccept = useCallback(
    (f: File) => {
      if (!accept || accept.trim() === "") {
        return true;
      }

      const patterns = accept
        .split(",")
        .map((s) => s.trim())
        .filter(Boolean);

      const mediaType = getMediaType(f);
      return patterns.some((pattern) => {
        if (pattern.endsWith("/*")) {
          const prefix = pattern.slice(0, -1); // e.g: image/* -> image/
          return mediaType.startsWith(prefix);
        }
        return mediaType === pattern;
      });
    },
    [accept],
  );

  const addLocal = useCallback(
    (fileList: File[] | FileList) => {
      const incoming = Array.from(fileList);
      const accepted = incoming.filter((f) => matchesAccept(f));
      if (incoming.length && accepted.length === 0) {
        onError?.({
          code: "accept",
          message: "No files match the accepted types.",
        });
        return;
      }
      const withinSize = (f: File) =>
        maxFileSize ? f.size <= maxFileSize : true;
      const sized = accepted.filter(withinSize);
      if (accepted.length > 0 && sized.length === 0) {
        onError?.({
          code: "max_file_size",
          message: "All files exceed the maximum size.",
        });
        return;
      }

      setItems((prev) => {
        const capacity =
          typeof maxFiles === "number"
            ? Math.max(0, maxFiles - prev.length)
            : undefined;
        const capped =
          typeof capacity === "number" ? sized.slice(0, capacity) : sized;
        if (typeof capacity === "number" && sized.length > capacity) {
          onError?.({
            code: "max_files",
            message: "Too many files. Some were not added.",
          });
        }
        const next: (FileUIPart & { id: string })[] = [];
        for (const file of capped) {
          next.push({
            id: nanoid(),
            type: "file",
            url: URL.createObjectURL(file),
            mediaType: getMediaType(file),
            filename: file.name,
          });
        }
        return prev.concat(next);
      });
    },
    [matchesAccept, maxFiles, maxFileSize, onError],
  );

  const removeLocal = useCallback(
    (id: string) =>
      setItems((prev) => {
        const found = prev.find((file) => file.id === id);
        if (found?.url) {
          URL.revokeObjectURL(found.url);
        }
        return prev.filter((file) => file.id !== id);
      }),
    [],
  );

  const clearLocal = useCallback(
    () =>
      setItems((prev) => {
        for (const file of prev) {
          if (file.url) {
            URL.revokeObjectURL(file.url);
          }
        }
        return [];
      }),
    [],
  );

  const baseAdd = usingProvider ? controller.attachments.add : addLocal;
  // addLocal already enforces maxFileSize, but the controller's add does not.
  // Wrap so the size limit holds whether or not a PromptInputProvider is used.
  const add = useCallback(
    (files: File[] | FileList) => {
      const incoming = Array.from(files);
      if (!maxFileSize) {
        baseAdd(files);
        return;
      }
      const sized = incoming.filter((f) => f.size <= maxFileSize);
      if (incoming.length > 0 && sized.length === 0) {
        onError?.({
          code: "max_file_size",
          message: "All files exceed the maximum size.",
        });
        return;
      }
      if (sized.length < incoming.length) {
        onError?.({
          code: "max_file_size",
          message: "Some files exceed the maximum size.",
        });
      }
      if (sized.length > 0) baseAdd(sized);
    },
    [baseAdd, maxFileSize, onError],
  );
  const remove = usingProvider ? controller.attachments.remove : removeLocal;
  const clear = usingProvider ? controller.attachments.clear : clearLocal;
  const openFileDialog = usingProvider
    ? controller.attachments.openFileDialog
    : openFileDialogLocal;

  // Let provider know about our hidden file input so external menus can call openFileDialog()
  useEffect(() => {
    if (!usingProvider) return;
    controller.__registerFileInput(inputRef, () => inputRef.current?.click());
  }, [usingProvider, controller]);

  // Note: File input cannot be programmatically set for security reasons
  // The syncHiddenInput prop is no longer functional
  useEffect(() => {
    if (syncHiddenInput && inputRef.current && files.length === 0) {
      inputRef.current.value = "";
    }
  }, [files, syncHiddenInput]);

  // Attach drop handlers on nearest form and document (opt-in)
  useEffect(() => {
    const form = formRef.current;
    if (!form) return;
    if (globalDrop) return; // when global drop is on, let the document-level handler own drops

    const onDragOver = (e: DragEvent) => {
      if (e.dataTransfer?.types?.includes("Files")) {
        e.preventDefault();
      }
    };
    const onDrop = (e: DragEvent) => {
      if (e.dataTransfer?.types?.includes("Files")) {
        e.preventDefault();
      }
      if (e.dataTransfer?.files && e.dataTransfer.files.length > 0) {
        const incoming = Array.from(e.dataTransfer.files);
        const accepted = incoming.filter((f) => matchesAccept(f));
        if (accepted.length === 0) {
          onError?.({
            code: "accept",
            message: "No files match the accepted types.",
          });
          return;
        }
        add(accepted);
      }
    };
    form.addEventListener("dragover", onDragOver);
    form.addEventListener("drop", onDrop);
    return () => {
      form.removeEventListener("dragover", onDragOver);
      form.removeEventListener("drop", onDrop);
    };
  }, [add, globalDrop, matchesAccept, onError]);

  useEffect(() => {
    if (!globalDrop) return;

    const onDragOver = (e: DragEvent) => {
      if (e.dataTransfer?.types?.includes("Files")) {
        e.preventDefault();
      }
    };
    const onDrop = (e: DragEvent) => {
      if (e.dataTransfer?.types?.includes("Files")) {
        e.preventDefault();
      }
      if (e.dataTransfer?.files && e.dataTransfer.files.length > 0) {
        const incoming = Array.from(e.dataTransfer.files);
        const accepted = incoming.filter((f) => matchesAccept(f));
        if (accepted.length === 0) {
          onError?.({
            code: "accept",
            message: "No files match the accepted types.",
          });
          return;
        }
        add(accepted);
      }
    };
    document.addEventListener("dragover", onDragOver);
    document.addEventListener("drop", onDrop);
    return () => {
      document.removeEventListener("dragover", onDragOver);
      document.removeEventListener("drop", onDrop);
    };
  }, [add, globalDrop, matchesAccept, onError]);

  useEffect(
    () => () => {
      if (!usingProvider) {
        for (const f of filesRef.current) {
          if (f.url) URL.revokeObjectURL(f.url);
        }
      }
    },
    // eslint-disable-next-line react-hooks/exhaustive-deps -- cleanup only on unmount; filesRef always current
    [usingProvider],
  );

  const handleChange: ChangeEventHandler<HTMLInputElement> = (event) => {
    if (event.currentTarget.files) {
      add(event.currentTarget.files);
    }
    // Reset input value to allow selecting files that were previously removed
    event.currentTarget.value = "";
  };

  const convertBlobUrlToDataUrl = async (
    url: string,
  ): Promise<string | null> => {
    try {
      const response = await fetch(url);
      const blob = await response.blob();
      return new Promise((resolve) => {
        const reader = new FileReader();
        reader.onloadend = () => resolve(reader.result as string);
        reader.onerror = () => resolve(null);
        reader.readAsDataURL(blob);
      });
    } catch {
      return null;
    }
  };

  const ctx = useMemo<AttachmentsContext>(
    () => ({
      files: files.map((item) => ({ ...item, id: item.id })),
      add,
      remove,
      clear,
      openFileDialog,
      fileInputRef: inputRef,
    }),
    [files, add, remove, clear, openFileDialog],
  );

  const handleSubmit: FormEventHandler<HTMLFormElement> = (event) => {
    event.preventDefault();

    const form = event.currentTarget;
    const text = usingProvider
      ? controller.textInput.value
      : (() => {
          const formData = new FormData(form);
          return (formData.get("message") as string) || "";
        })();

    // Reset form immediately after capturing text to avoid race condition
    // where user input during async blob conversion would be lost
    if (clearOnSubmit && !usingProvider) {
      form.reset();
    }

    // Convert blob URLs to data URLs asynchronously
    Promise.all(
      files.map(async ({ id, ...item }) => {
        // biome-ignore lint/complexity/useOptionalChain: codegen - ai elements
        if (item.url && item.url.startsWith("blob:")) {
          const dataUrl = await convertBlobUrlToDataUrl(item.url);
          // If conversion failed, keep the original blob URL
          return {
            ...item,
            url: dataUrl ?? item.url,
          };
        }
        return item;
      }),
    )
      .then((convertedFiles: FileUIPart[]) => {
        try {
          const result = onSubmit({ text, files: convertedFiles }, event);

          // Handle both sync and async onSubmit
          if (result instanceof Promise) {
            result
              .then(() => {
                if (clearOnSubmit) {
                  clear();
                  if (usingProvider) {
                    controller.textInput.clear();
                  }
                }
              })
              .catch(() => {
                // Don't clear on error - user may want to retry
              });
          } else {
            // Sync function completed without throwing, clear attachments
            if (clearOnSubmit) {
              clear();
              if (usingProvider) {
                controller.textInput.clear();
              }
            }
          }
        } catch {
          // Don't clear on error - user may want to retry
        }
      })
      .catch(() => {
        // Don't clear on error - user may want to retry
      });
  };

  // Render with or without local provider
  const inner = (
    <>
      <input
        accept={accept}
        aria-label="Upload files"
        className="hidden"
        multiple={multiple}
        onChange={handleChange}
        ref={inputRef}
        title="Upload files"
        type="file"
      />
      <form
        className={cn("w-full", className)}
        onSubmit={handleSubmit}
        ref={formRef}
        {...props}
      >
        <InputGroup className="overflow-hidden shadow-md ring-1 ring-ring/10 has-[[data-slot=input-group-control]:focus-visible]:shadow-lg has-[[data-slot=input-group-control]:focus-visible]:ring-[4px] has-[[data-slot=input-group-control]:focus-visible]:ring-ring/30">
          {children}
        </InputGroup>
      </form>
    </>
  );

  return usingProvider ? (
    inner
  ) : (
    <LocalAttachmentsContext.Provider value={ctx}>
      {inner}
    </LocalAttachmentsContext.Provider>
  );
};

export type PromptInputBodyProps = HTMLAttributes<HTMLDivElement>;

export const PromptInputBody = ({
  className,
  ...props
}: PromptInputBodyProps) => (
  <div className={cn("contents", className)} {...props} />
);

export type PromptInputTextareaProps = ComponentProps<
  typeof InputGroupTextarea
> & {
  disableEnterSubmit?: boolean;
};

export const PromptInputTextarea = ({
  onChange,
  onKeyDown,
  className,
  placeholder = "What would you like to know?",
  disableEnterSubmit = false,
  ...props
}: PromptInputTextareaProps) => {
  const controller = useOptionalPromptInputController();
  const attachments = usePromptInputAttachments();
  const [isComposing, setIsComposing] = useState(false);
  const [isFullscreen, setIsFullscreen] = useState(false);
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);
  const isMobile = useIsMobile();

  const handleKeyDown: KeyboardEventHandler<HTMLTextAreaElement> = (e) => {
    onKeyDown?.(e);
    if (e.defaultPrevented) {
      return;
    }

    if (e.key === "Enter") {
      if (isComposing || e.nativeEvent.isComposing) {
        return;
      }
      if (disableEnterSubmit) {
        e.preventDefault();
        return;
      }
      if (e.shiftKey) {
        return;
      }
      e.preventDefault();

      // Check if the submit button is disabled before submitting
      const form = e.currentTarget.form;
      const submitButton = form?.querySelector(
        'button[type="submit"]',
      ) as HTMLButtonElement | null;
      if (submitButton?.disabled) {
        return;
      }

      form?.requestSubmit();

      if (isFullscreen) {
        setIsFullscreen(false);
      }
    }

    // Remove last attachment when Backspace is pressed and textarea is empty
    if (
      e.key === "Backspace" &&
      e.currentTarget.value === "" &&
      attachments.files.length > 0
    ) {
      e.preventDefault();
      const lastAttachment = attachments.files.at(-1);
      if (lastAttachment) {
        attachments.remove(lastAttachment.id);
      }
    }
  };

  const handlePaste: ClipboardEventHandler<HTMLTextAreaElement> = (event) => {
    const items = event.clipboardData?.items;

    if (!items) {
      return;
    }

    const files: File[] = [];

    for (const item of items) {
      if (item.kind === "file") {
        const file = item.getAsFile();
        if (file) {
          files.push(file);
        }
      }
    }

    if (files.length > 0) {
      event.preventDefault();
      attachments.add(files);
    }
  };

  const controlledProps = controller
    ? {
        value: controller.textInput.value,
        onChange: (e: ChangeEvent<HTMLTextAreaElement>) => {
          controller.textInput.setInput(e.currentTarget.value);
          onChange?.(e);
        },
      }
    : {
        onChange,
      };

  const showExpandButton =
    isMobile && controller
      ? controller.textInput.value.split("\n").length > 5 ||
        controller.textInput.value.length > 300
      : false;

  const toggleFullscreen = useCallback(() => {
    setIsFullscreen((prev) => !prev);
  }, []);

  return (
    <div ref={containerRef} className="relative w-full">
      <InputGroupTextarea
        className={cn(
          "field-sizing-content",
          isFullscreen ? "max-h-[75vh]" : "max-h-48 min-h-16",
          className,
        )}
        name="message"
        onCompositionEnd={() => setIsComposing(false)}
        onCompositionStart={() => setIsComposing(true)}
        onKeyDown={handleKeyDown}
        onPaste={handlePaste}
        placeholder={placeholder}
        ref={textareaRef}
        {...props}
        {...controlledProps}
      />

      {showExpandButton && (
        <Button
          type="button"
          variant="ghost"
          size="icon-sm"
          className={cn(
            "absolute bottom-2 right-2 size-6 opacity-70 hover:opacity-100 bg-background",
            "transition-opacity",
          )}
          onClick={toggleFullscreen}
        >
          {isFullscreen ? (
            <>
              <Minimize2Icon className="size-4" />
              <span className="sr-only">Minimize</span>
            </>
          ) : (
            <>
              <Maximize2Icon className="size-3" />
              <span className="sr-only">Expand to fullscreen</span>
            </>
          )}
        </Button>
      )}
    </div>
  );
};

export type PromptInputHeaderProps = Omit<
  ComponentProps<typeof InputGroupAddon>,
  "align"
>;

export const PromptInputHeader = ({
  className,
  ...props
}: PromptInputHeaderProps) => (
  <InputGroupAddon
    align="block-end"
    className={cn("order-first flex-wrap gap-1", className)}
    {...props}
  />
);

export type PromptInputFooterProps = Omit<
  ComponentProps<typeof InputGroupAddon>,
  "align"
>;

export const PromptInputFooter = ({
  className,
  ...props
}: PromptInputFooterProps) => (
  <InputGroupAddon
    align="block-end"
    className={cn("justify-between gap-1", className)}
    {...props}
  />
);

export type PromptInputToolsProps = ComponentProps<"div">;

export const PromptInputTools = ({
  className,
  ...props
}: PromptInputToolsProps) => (
  <div className={cn("flex items-center gap-1", className)} {...props} />
);

export type PromptInputButtonProps = ComponentProps<typeof InputGroupButton>;

export const PromptInputButton = ({
  variant = "ghost",
  className,
  size,
  ...props
}: PromptInputButtonProps) => {
  const newSize =
    size ?? (Children.count(props.children) > 1 ? "sm" : "icon-sm");

  return (
    <InputGroupButton
      className={cn(className)}
      size={newSize}
      type="button"
      variant={variant}
      {...props}
    />
  );
};

export type PromptInputActionMenuProps = ComponentProps<typeof DropdownMenu> & {
  /** Close the menu when files are added to attachments */
  closeOnFileAdd?: boolean;
};

export const PromptInputActionMenu = ({
  closeOnFileAdd = true,
  open: controlledOpen,
  onOpenChange: controlledOnOpenChange,
  ...props
}: PromptInputActionMenuProps) => {
  const attachments = usePromptInputAttachments();
  const [internalOpen, setInternalOpen] = useState(false);
  const prevFilesCountRef = useRef(attachments.files.length);

  // Track when files are added and close the menu
  useEffect(() => {
    if (
      closeOnFileAdd &&
      attachments.files.length > prevFilesCountRef.current
    ) {
      setInternalOpen(false);
      controlledOnOpenChange?.(false);
    }
    prevFilesCountRef.current = attachments.files.length;
  }, [attachments.files.length, closeOnFileAdd, controlledOnOpenChange]);

  const isControlled = controlledOpen !== undefined;
  const open = isControlled ? controlledOpen : internalOpen;
  const onOpenChange = isControlled
    ? controlledOnOpenChange
    : (newOpen: boolean) => {
        setInternalOpen(newOpen);
        controlledOnOpenChange?.(newOpen);
      };

  return <DropdownMenu open={open} onOpenChange={onOpenChange} {...props} />;
};

export type PromptInputActionMenuTriggerProps = PromptInputButtonProps;

export const PromptInputActionMenuTrigger = ({
  className,
  children,
  ...props
}: PromptInputActionMenuTriggerProps) => (
  <DropdownMenuTrigger asChild>
    <PromptInputButton className={className} {...props}>
      {children ?? <PlusIcon className="size-4" />}
    </PromptInputButton>
  </DropdownMenuTrigger>
);

export type PromptInputActionMenuContentProps = ComponentProps<
  typeof DropdownMenuContent
>;
export const PromptInputActionMenuContent = ({
  className,
  ...props
}: PromptInputActionMenuContentProps) => (
  <DropdownMenuContent align="start" className={cn(className)} {...props} />
);

export type PromptInputActionMenuItemProps = ComponentProps<
  typeof DropdownMenuItem
>;
export const PromptInputActionMenuItem = ({
  className,
  ...props
}: PromptInputActionMenuItemProps) => (
  <DropdownMenuItem className={cn(className)} {...props} />
);

// Note: Actions that perform side-effects (like opening a file dialog)
// are provided in opt-in modules (e.g., prompt-input-attachments).

export type PromptInputSubmitProps = ComponentProps<typeof InputGroupButton> & {
  status?: ChatStatus;
};

export const PromptInputSubmit = ({
  className,
  variant = "default",
  size = "icon-sm",
  status,
  children,
  ...props
}: PromptInputSubmitProps) => {
  let Icon = <CornerDownLeftIcon className="size-4" />;

  if (status === "submitted") {
    Icon = <Loader2Icon className="size-4 animate-spin" />;
  } else if (status === "streaming") {
    Icon = <SquareIcon className="size-4" />;
  } else if (status === "error") {
    Icon = <XIcon className="size-4" />;
  }

  return (
    <InputGroupButton
      aria-label="Submit"
      className={cn(className)}
      size={size}
      type="submit"
      variant={variant}
      {...props}
    >
      {children ?? Icon}
    </InputGroupButton>
  );
};

interface SpeechRecognition extends EventTarget {
  continuous: boolean;
  interimResults: boolean;
  lang: string;
  start(): void;
  stop(): void;
  // biome-ignore lint/suspicious/noExplicitAny: codegen - ai elements
  onstart: ((this: SpeechRecognition, ev: Event) => any) | null;
  // biome-ignore lint/suspicious/noExplicitAny: codegen - ai elements
  onend: ((this: SpeechRecognition, ev: Event) => any) | null;
  onresult: // biome-ignore lint/suspicious/noExplicitAny: codegen - ai elements
  ((this: SpeechRecognition, ev: SpeechRecognitionEvent) => any) | null;
  onerror: // biome-ignore lint/suspicious/noExplicitAny: codegen - ai elements
  ((this: SpeechRecognition, ev: SpeechRecognitionErrorEvent) => any) | null;
}

interface SpeechRecognitionEvent extends Event {
  results: SpeechRecognitionResultList;
  resultIndex: number;
}

type SpeechRecognitionResultList = {
  readonly length: number;
  item(index: number): SpeechRecognitionResult;
  [index: number]: SpeechRecognitionResult;
};

type SpeechRecognitionResult = {
  readonly length: number;
  item(index: number): SpeechRecognitionAlternative;
  [index: number]: SpeechRecognitionAlternative;
  isFinal: boolean;
};

type SpeechRecognitionAlternative = {
  transcript: string;
  confidence: number;
};

interface SpeechRecognitionErrorEvent extends Event {
  error: string;
}

declare global {
  interface Window {
    SpeechRecognition: {
      new (): SpeechRecognition;
    };
    webkitSpeechRecognition: {
      new (): SpeechRecognition;
    };
  }
}

export type PromptInputSpeechButtonProps = ComponentProps<
  typeof PromptInputButton
> & {
  textareaRef?: RefObject<HTMLTextAreaElement | null>;
  onTranscriptionChange?: (text: string) => void;
};

export const PromptInputSpeechButton = ({
  className,
  textareaRef,
  onTranscriptionChange,
  ...props
}: PromptInputSpeechButtonProps) => {
  const [isListening, setIsListening] = useState(false);
  const [recognition, setRecognition] = useState<SpeechRecognition | null>(
    null,
  );
  const recognitionRef = useRef<SpeechRecognition | null>(null);

  useEffect(() => {
    if (
      typeof window !== "undefined" &&
      ("SpeechRecognition" in window || "webkitSpeechRecognition" in window)
    ) {
      const SpeechRecognition =
        window.SpeechRecognition || window.webkitSpeechRecognition;
      const speechRecognition = new SpeechRecognition();

      speechRecognition.continuous = true;
      speechRecognition.interimResults = true;
      speechRecognition.lang = "en-US";

      speechRecognition.onstart = () => {
        setIsListening(true);
      };

      speechRecognition.onend = () => {
        setIsListening(false);
      };

      speechRecognition.onresult = (event) => {
        let finalTranscript = "";

        for (let i = event.resultIndex; i < event.results.length; i++) {
          const result = event.results[i];
          if (result.isFinal) {
            finalTranscript += result[0]?.transcript ?? "";
          }
        }

        if (finalTranscript && textareaRef?.current) {
          const textarea = textareaRef.current;
          const currentValue = textarea.value;
          const newValue =
            currentValue + (currentValue ? " " : "") + finalTranscript;

          textarea.value = newValue;
          textarea.dispatchEvent(new Event("input", { bubbles: true }));
          onTranscriptionChange?.(newValue);
        }
      };

      speechRecognition.onerror = (event) => {
        console.error("Speech recognition error:", event.error);
        setIsListening(false);
      };

      recognitionRef.current = speechRecognition;
      setRecognition(speechRecognition);
    }

    return () => {
      if (recognitionRef.current) {
        recognitionRef.current.stop();
      }
    };
  }, [textareaRef, onTranscriptionChange]);

  const toggleListening = useCallback(() => {
    if (!recognition) {
      return;
    }

    if (isListening) {
      recognition.stop();
    } else {
      recognition.start();
    }
  }, [recognition, isListening]);

  return (
    <PromptInputButton
      className={cn(
        "relative transition-all duration-200",
        isListening && "animate-pulse bg-accent text-accent-foreground",
        className,
      )}
      disabled={!recognition}
      onClick={toggleListening}
      {...props}
    >
      <MicIcon className="size-4" />
    </PromptInputButton>
  );
};

export type PromptInputSelectProps = ComponentProps<typeof Select>;

export const PromptInputSelect = (props: PromptInputSelectProps) => (
  <Select {...props} />
);

export type PromptInputSelectTriggerProps = ComponentProps<
  typeof SelectTrigger
>;

export const PromptInputSelectTrigger = ({
  className,
  ...props
}: PromptInputSelectTriggerProps) => (
  <SelectTrigger
    className={cn(
      "border-none bg-transparent font-medium text-muted-foreground shadow-none transition-colors",
      "hover:bg-accent hover:text-foreground aria-expanded:bg-accent aria-expanded:text-foreground",
      className,
    )}
    {...props}
  />
);

export type PromptInputSelectContentProps = ComponentProps<
  typeof SelectContent
>;

export const PromptInputSelectContent = ({
  className,
  ...props
}: PromptInputSelectContentProps) => (
  <SelectContent className={cn(className)} {...props} />
);

export type PromptInputSelectItemProps = ComponentProps<typeof SelectItem>;

export const PromptInputSelectItem = ({
  className,
  ...props
}: PromptInputSelectItemProps) => (
  <SelectItem className={cn(className)} {...props} />
);

export type PromptInputSelectValueProps = ComponentProps<typeof SelectValue>;

export const PromptInputSelectValue = ({
  className,
  ...props
}: PromptInputSelectValueProps) => (
  <SelectValue className={cn(className)} {...props} />
);

export type PromptInputHoverCardProps = ComponentProps<typeof HoverCard>;

export const PromptInputHoverCard = ({
  openDelay = 0,
  closeDelay = 0,
  ...props
}: PromptInputHoverCardProps) => (
  <HoverCard closeDelay={closeDelay} openDelay={openDelay} {...props} />
);

export type PromptInputHoverCardTriggerProps = ComponentProps<
  typeof HoverCardTrigger
>;

export const PromptInputHoverCardTrigger = (
  props: PromptInputHoverCardTriggerProps,
) => <HoverCardTrigger {...props} />;

export type PromptInputHoverCardContentProps = ComponentProps<
  typeof HoverCardContent
>;

export const PromptInputHoverCardContent = ({
  align = "start",
  ...props
}: PromptInputHoverCardContentProps) => (
  <HoverCardContent align={align} {...props} />
);

export type PromptInputCommandProps = ComponentProps<typeof Command>;

export const PromptInputCommand = ({
  className,
  ...props
}: PromptInputCommandProps) => <Command className={cn(className)} {...props} />;

export type PromptInputCommandInputProps = ComponentProps<typeof CommandInput>;

export const PromptInputCommandInput = ({
  className,
  ...props
}: PromptInputCommandInputProps) => (
  <CommandInput className={cn(className)} {...props} />
);

export type PromptInputCommandListProps = ComponentProps<typeof CommandList>;

export const PromptInputCommandList = ({
  className,
  ...props
}: PromptInputCommandListProps) => (
  <CommandList className={cn(className)} {...props} />
);

export type PromptInputCommandEmptyProps = ComponentProps<typeof CommandEmpty>;

export const PromptInputCommandEmpty = ({
  className,
  ...props
}: PromptInputCommandEmptyProps) => (
  <CommandEmpty className={cn(className)} {...props} />
);

export type PromptInputCommandGroupProps = ComponentProps<typeof CommandGroup>;

export const PromptInputCommandGroup = ({
  className,
  ...props
}: PromptInputCommandGroupProps) => (
  <CommandGroup className={cn(className)} {...props} />
);

export type PromptInputCommandItemProps = ComponentProps<typeof CommandItem>;

export const PromptInputCommandItem = ({
  className,
  ...props
}: PromptInputCommandItemProps) => (
  <CommandItem className={cn(className)} {...props} />
);

export type PromptInputCommandSeparatorProps = ComponentProps<
  typeof CommandSeparator
>;

export const PromptInputCommandSeparator = ({
  className,
  ...props
}: PromptInputCommandSeparatorProps) => (
  <CommandSeparator className={cn(className)} {...props} />
);
