import { DocumentDuplicateIcon, PencilSquareIcon, TrashIcon } from "@heroicons/react/20/solid";
import { ClipboardIcon } from "@heroicons/react/24/outline";
import { ChartBarIcon } from "@heroicons/react/24/solid";
import { type OutputColumnMetadata } from "@internal/tsql";
import { DialogClose } from "@radix-ui/react-dialog";
import { IconBraces, IconChartHistogram, IconFileTypeCsv } from "@tabler/icons-react";
import { assertNever } from "assert-never";
import { Maximize2 } from "lucide-react";
import { useCallback, useRef, useState, type ReactNode } from "react";
import { z } from "zod";
import { Card } from "~/components/primitives/charts/Card";
import { ShortcutKey } from "~/components/primitives/ShortcutKey";
import { SimpleTooltip } from "~/components/primitives/Tooltip";
import { useShortcutKeys } from "~/hooks/useShortcutKeys";
import { cn } from "~/utils/cn";
import { rowsToCSV, rowsToJSON } from "~/utils/dataExport";
import { QueryResultsChart } from "../code/QueryResultsChart";
import { TSQLResultsTable } from "../code/TSQLResultsTable";
import { Button } from "../primitives/Buttons";
import { Callout } from "../primitives/Callout";
import { BigNumberCard } from "../primitives/charts/BigNumberCard";
import { Dialog, DialogContent, DialogFooter, DialogHeader } from "../primitives/Dialog";
import { Input } from "../primitives/Input";
import { InputGroup } from "../primitives/InputGroup";
import { Label } from "../primitives/Label";
import { LoadingBarDivider } from "../primitives/LoadingBarDivider";
import {
  Popover,
  PopoverContent,
  PopoverMenuItem,
  PopoverVerticalEllipseTrigger,
} from "../primitives/Popover";

const ChartType = z.union([z.literal("bar"), z.literal("line")]);
export type ChartType = z.infer<typeof ChartType>;

const SortDirection = z.union([z.literal("asc"), z.literal("desc")]);
export type SortDirection = z.infer<typeof SortDirection>;

const AggregationType = z.union([
  z.literal("sum"),
  z.literal("avg"),
  z.literal("count"),
  z.literal("min"),
  z.literal("max"),
]);
export type AggregationType = z.infer<typeof AggregationType>;

const chartConfigOptions = {
  chartType: ChartType,
  xAxisColumn: z.string().nullable(),
  yAxisColumns: z.string().array(),
  groupByColumn: z.string().nullable(),
  stacked: z.boolean(),
  sortByColumn: z.string().nullable(),
  sortDirection: SortDirection,
  aggregation: AggregationType,
  seriesColors: z.record(z.string()).optional(),
};

const ChartConfiguration = z.object({ ...chartConfigOptions });
export type ChartConfiguration = z.infer<typeof ChartConfiguration>;

const BigNumberAggregationType = z.union([
  z.literal("sum"),
  z.literal("avg"),
  z.literal("count"),
  z.literal("min"),
  z.literal("max"),
  z.literal("first"),
  z.literal("last"),
]);
export type BigNumberAggregationType = z.infer<typeof BigNumberAggregationType>;

const BigNumberSortDirection = z.union([z.literal("asc"), z.literal("desc")]);

const bigNumberConfigOptions = {
  column: z.string(),
  aggregation: BigNumberAggregationType,
  sortDirection: BigNumberSortDirection.optional(),
  abbreviate: z.boolean().default(false),
  prefix: z.string().optional(),
  suffix: z.string().optional(),
};

const BigNumberConfiguration = z.object({ ...bigNumberConfigOptions });
export type BigNumberConfiguration = z.infer<typeof BigNumberConfiguration>;

export const QueryWidgetConfig = z.discriminatedUnion("type", [
  z.object({
    type: z.literal("table"),
    prettyFormatting: z.boolean().default(true),
    sorting: z
      .array(
        z.object({
          desc: z.boolean(),
          id: z.string(),
        })
      )
      .default([]),
  }),
  z.object({
    type: z.literal("chart"),
    ...chartConfigOptions,
  }),
  z.object({
    type: z.literal("bignumber"),
    ...bigNumberConfigOptions,
  }),
  z.object({
    type: z.literal("title"),
  }),
]);

export type QueryWidgetConfig = z.infer<typeof QueryWidgetConfig>;

/** Result data containing rows and column metadata */
export type QueryWidgetData = {
  rows: Record<string, unknown>[];
  columns: OutputColumnMetadata[];
};

/** Widget configuration with optional result data (used for edit callbacks) */
export type WidgetData = {
  title: string;
  query: string;
  display: QueryWidgetConfig;
  /** The current result data from the widget */
  resultData?: QueryWidgetData;
};

export type QueryWidgetProps = {
  title: ReactNode;
  /** String title for rename dialog (optional - if not provided, rename won't be available) */
  titleString?: string;
  /** The TSQL query string (used for "Copy query" in the menu) */
  query?: string;
  isLoading?: boolean;
  error?: string;
  data: QueryWidgetData;
  config: QueryWidgetConfig;
  /** The effective time range for the query (used to show full x-axis on time-based charts) */
  timeRange?: { from: string; to: string };
  accessory?: ReactNode;
  isResizing?: boolean;
  isDraggable?: boolean;
  /** Additional className applied to the Card wrapper */
  className?: string;
  /** Callback when edit is clicked. Receives the current data. */
  onEdit?: (data: QueryWidgetData) => void;
  /** Callback when rename is clicked. Receives the new title. */
  onRename?: (newTitle: string) => void;
  /** Callback when delete is clicked. */
  onDelete?: () => void;
  /** Callback when duplicate is clicked. Receives the current data. */
  onDuplicate?: (data: QueryWidgetData) => void;
  /** When true, show table column headers even when there are no rows */
  showTableHeaderOnEmpty?: boolean;
  /** Column names to hide from table display but keep in row data (useful for linking) */
  hiddenColumns?: string[];
};

export function QueryWidget({
  title,
  titleString,
  query,
  accessory,
  isLoading,
  error,
  isResizing,
  isDraggable,
  className,
  onEdit,
  onRename,
  onDelete,
  onDuplicate,
  ...props
}: QueryWidgetProps) {
  const [isFullscreen, setIsFullscreen] = useState(false);
  const [isMenuOpen, setIsMenuOpen] = useState(false);
  const [isRenameDialogOpen, setIsRenameDialogOpen] = useState(false);
  const [renameValue, setRenameValue] = useState(titleString ?? "");
  const containerRef = useRef<HTMLDivElement>(null);

  const hasEditActions = onEdit || onRename || onDelete || onDuplicate;
  const hasData = props.data.rows.length > 0;

  // "v" to toggle fullscreen on hovered widget
  useShortcutKeys({
    shortcut: { key: "v" },
    action: useCallback(() => {
      const isHovered = containerRef.current?.matches(":hover");
      if (!isFullscreen && !isHovered) return;
      setIsFullscreen((prev) => !prev);
    }, [isFullscreen]),
  });

  const copyToClipboard = useCallback((text: string) => {
    navigator.clipboard.writeText(text);
  }, []);

  const copyQuery = useCallback(() => {
    if (query) {
      copyToClipboard(query);
    }
  }, [query, copyToClipboard]);

  const copyJSON = useCallback(() => {
    copyToClipboard(rowsToJSON(props.data.rows));
  }, [props.data.rows, copyToClipboard]);

  const copyCSV = useCallback(() => {
    copyToClipboard(rowsToCSV(props.data.rows, props.data.columns));
  }, [props.data, copyToClipboard]);

  return (
    <div ref={containerRef} className="group h-full">
      <Card className={cn("h-full overflow-hidden px-0 pb-0", className)}>
        <Card.Header draggable={isDraggable}>
          <div className="flex items-center gap-1.5">{title}</div>
          <Card.Accessory>
            <SimpleTooltip
              button={
                <span className="opacity-0 transition-opacity group-hover:opacity-100">
                  <Button
                    variant="minimal/small"
                    LeadingIcon={Maximize2}
                    leadingIconClassName="text-text-dimmed group-hover/button:text-text-bright"
                    onClick={() => setIsFullscreen(true)}
                    className="!px-1"
                  />
                </span>
              }
              content={
                <span className="flex items-center gap-1">
                  Maximize
                  <ShortcutKey shortcut={{ key: "v" }} variant="small/bright" />
                </span>
              }
              asChild
            />
            <Popover open={isMenuOpen} onOpenChange={setIsMenuOpen}>
              <PopoverVerticalEllipseTrigger
                isOpen={isMenuOpen}
                className={cn(
                  "transition-opacity",
                  isMenuOpen ? "opacity-100" : "opacity-0 group-hover:opacity-100"
                )}
              />
              <PopoverContent align="end" className="p-0">
                <div className="flex flex-col gap-1 p-1">
                  {hasEditActions && (
                    <>
                      {onEdit && (
                        <PopoverMenuItem
                          icon={IconChartHistogram}
                          title="Edit chart"
                          onClick={() => {
                            onEdit(props.data);
                            setIsMenuOpen(false);
                          }}
                          leadingIconClassName="-ml-0.5 -mr-1"
                        />
                      )}
                      {onRename && (
                        <PopoverMenuItem
                          icon={PencilSquareIcon}
                          title="Rename"
                          onClick={() => {
                            setRenameValue(titleString ?? "");
                            setIsRenameDialogOpen(true);
                            setIsMenuOpen(false);
                          }}
                        />
                      )}
                      {onDuplicate && (
                        <PopoverMenuItem
                          icon={DocumentDuplicateIcon}
                          title="Duplicate chart"
                          onClick={() => {
                            onDuplicate(props.data);
                            setIsMenuOpen(false);
                          }}
                          className="pr-4"
                        />
                      )}
                    </>
                  )}
                  {query && (
                    <PopoverMenuItem
                      icon={ClipboardIcon}
                      title="Copy query"
                      onClick={() => {
                        copyQuery();
                        setIsMenuOpen(false);
                      }}
                    />
                  )}
                  <PopoverMenuItem
                    icon={IconBraces}
                    title="Copy JSON"
                    disabled={!hasData}
                    onClick={() => {
                      copyJSON();
                      setIsMenuOpen(false);
                    }}
                    leadingIconClassName="-ml-0.5 -mr-1"
                  />
                  <PopoverMenuItem
                    icon={IconFileTypeCsv}
                    title="Copy CSV"
                    disabled={!hasData}
                    onClick={() => {
                      copyCSV();
                      setIsMenuOpen(false);
                    }}
                    leadingIconClassName="-ml-0.5 -mr-1"
                  />
                  {onDelete && (
                    <PopoverMenuItem
                      icon={TrashIcon}
                      title="Delete chart"
                      leadingIconClassName="text-error"
                      className="text-error hover:!bg-error/10"
                      onClick={() => {
                        onDelete();
                        setIsMenuOpen(false);
                      }}
                    />
                  )}
                </div>
              </PopoverContent>
            </Popover>
            {accessory}
          </Card.Accessory>
        </Card.Header>
        <LoadingBarDivider isLoading={isLoading ?? false} className="bg-transparent" />
        <Card.Content className="min-h-0 flex-1 overflow-hidden p-0">
          {isResizing ? (
            <div className="flex h-full flex-1 items-center justify-center p-3">
              <div className="flex flex-col items-center gap-1 text-text-dimmed">
                <ChartBarIcon className="size-10 text-text-dimmed" />{" "}
                <span className="text-base font-medium">Resizing...</span>
              </div>
            </div>
          ) : error ? (
            <div className="p-3">
              <Callout variant="error">{error}</Callout>
            </div>
          ) : (
            <QueryWidgetBody
              {...props}
              title={title}
              isFullscreen={isFullscreen}
              setIsFullscreen={setIsFullscreen}
              isLoading={isLoading ?? false}
            />
          )}
        </Card.Content>
      </Card>

      {/* Rename Dialog */}
      {onRename && (
        <Dialog open={isRenameDialogOpen} onOpenChange={setIsRenameDialogOpen}>
          <DialogContent className="sm:max-w-md">
            <DialogHeader>Rename chart</DialogHeader>
            <form
              className="space-y-4 pt-3"
              onSubmit={(e) => {
                e.preventDefault();
                if (renameValue.trim()) {
                  onRename(renameValue.trim());
                  setIsRenameDialogOpen(false);
                }
              }}
            >
              <InputGroup>
                <Label>Title</Label>
                <Input
                  value={renameValue}
                  onChange={(e) => setRenameValue(e.target.value)}
                  placeholder="Chart title"
                  autoFocus
                />
              </InputGroup>
              <DialogFooter>
                <DialogClose asChild>
                  <Button variant="tertiary/medium">Cancel</Button>
                </DialogClose>
                <Button type="submit" variant="primary/medium" disabled={!renameValue.trim()}>
                  Save
                </Button>
              </DialogFooter>
            </form>
          </DialogContent>
        </Dialog>
      )}
    </div>
  );
}

type QueryWidgetBodyProps = {
  title: ReactNode;
  data: QueryWidgetData;
  config: QueryWidgetConfig;
  timeRange?: { from: string; to: string };
  isFullscreen: boolean;
  setIsFullscreen: (open: boolean) => void;
  isLoading: boolean;
  showTableHeaderOnEmpty?: boolean;
  hiddenColumns?: string[];
};

function QueryWidgetBody({
  title,
  data,
  config,
  timeRange,
  isFullscreen,
  setIsFullscreen,
  isLoading,
  showTableHeaderOnEmpty,
  hiddenColumns,
}: QueryWidgetBodyProps) {
  const type = config.type;

  // Only show the loading state if we have no data yet (initial load).
  // During a reload with existing data, keep showing the current data
  // while the loading bar in the header indicates a refresh is in progress.
  const hasData = data.rows.length > 0;
  const showLoading = isLoading && !hasData;

  switch (type) {
    case "table": {
      return (
        <>
          <TSQLResultsTable
            rows={data.rows}
            columns={data.columns}
            prettyFormatting={config.prettyFormatting}
            sorting={config.sorting}
            showHeaderOnEmpty={showTableHeaderOnEmpty}
            hiddenColumns={hiddenColumns}
          />
          <Dialog open={isFullscreen} onOpenChange={setIsFullscreen}>
            <DialogContent
              fullscreen
              className="flex flex-col gap-0 bg-background-bright px-0 pb-0"
            >
              <DialogHeader className="px-4">{title}</DialogHeader>
              <div className="min-h-0 w-full flex-1 pt-2.5">
                <TSQLResultsTable
                  rows={data.rows}
                  columns={data.columns}
                  prettyFormatting={config.prettyFormatting}
                  sorting={config.sorting}
                  showHeaderOnEmpty={showTableHeaderOnEmpty}
                />
              </div>
            </DialogContent>
          </Dialog>
        </>
      );
    }
    case "chart": {
      return (
        <>
          <QueryResultsChart
            rows={data.rows}
            columns={data.columns}
            config={config}
            timeRange={timeRange}
            onViewAllLegendItems={() => setIsFullscreen(true)}
            isLoading={showLoading}
          />
          <Dialog open={isFullscreen} onOpenChange={setIsFullscreen}>
            <DialogContent fullscreen className="flex flex-col bg-background-bright">
              <DialogHeader>{title}</DialogHeader>
              <div className="min-h-0 w-full flex-1 overflow-hidden pt-4">
                <QueryResultsChart
                  rows={data.rows}
                  columns={data.columns}
                  config={config}
                  timeRange={timeRange}
                  fullLegend
                  legendScrollable
                  isLoading={showLoading}
                />
              </div>
            </DialogContent>
          </Dialog>
        </>
      );
    }
    case "bignumber": {
      return (
        <>
          <BigNumberCard
            rows={data.rows}
            columns={data.columns}
            config={config}
            isLoading={showLoading}
          />
          <Dialog open={isFullscreen} onOpenChange={setIsFullscreen}>
            <DialogContent fullscreen className="flex flex-col bg-background-bright">
              <DialogHeader>{title}</DialogHeader>
              <div className="flex min-h-0 w-full flex-1 items-center justify-center pt-4">
                <BigNumberCard
                  rows={data.rows}
                  columns={data.columns}
                  config={config}
                  isLoading={showLoading}
                />
              </div>
            </DialogContent>
          </Dialog>
        </>
      );
    }
    case "title": {
      // Title widgets are rendered by TitleWidget, not QueryWidget
      return null;
    }
    default: {
      assertNever(type);
    }
  }
}
