"use client";

import { E2eTestId, parseVaultReference } from "@shared";
import { CheckCircle2, Info, Key, Loader2 } from "lucide-react";
import { lazy, Suspense, useEffect, useMemo, useState } from "react";
import {
  FieldScopeSelect,
  type FieldScopeValue,
} from "@/components/field-scope-select";
import { StandardDialog } from "@/components/standard-dialog";
import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Switch } from "@/components/ui/switch";
import { Textarea } from "@/components/ui/textarea";
import {
  MCP_CONFIG_AUTOCOMPLETE,
  MCP_SECRET_AUTOCOMPLETE,
} from "@/lib/mcp/mcp-form-autocomplete";
import { usePresetEntityName } from "@/lib/organization.query";

const ExternalSecretSelector = lazy(
  () =>
    // biome-ignore lint/style/noRestrictedImports: lazy loading
    import("@/components/external-secret-selector.ee"),
);

export type EnvVarType = "plain_text" | "secret" | "boolean" | "number";

export interface EnvVarDraft {
  key: string;
  type: EnvVarType;
  scope: FieldScopeValue;
  required: boolean;
  description: string;
  value: string;
}

export type EnvironmentVariableDialogMode = "add" | "edit";

interface EnvironmentVariableDialogProps {
  open: boolean;
  mode: EnvironmentVariableDialogMode;
  initial: EnvVarDraft | null;
  existingKeys: string[];
  secretKeysWithStoredValue?: Set<string>;
  useExternalSecretsManager?: boolean;
  disableInstallation?: boolean;
  disableInstallationReason?: string;
  onClose: () => void;
  onConfirm: (draft: EnvVarDraft) => void;
}

function makeEmptyDraft(disableInstallation: boolean): EnvVarDraft {
  return {
    key: "",
    type: "plain_text",
    scope: disableInstallation ? "static" : "installation",
    required: !disableInstallation,
    description: "",
    value: "",
  };
}

export function EnvironmentVariableDialog({
  open,
  mode,
  initial,
  existingKeys,
  secretKeysWithStoredValue,
  useExternalSecretsManager = false,
  disableInstallation = false,
  disableInstallationReason,
  onClose,
  onConfirm,
}: EnvironmentVariableDialogProps) {
  const { singular } = usePresetEntityName();
  const [draft, setDraft] = useState<EnvVarDraft>(
    initial ?? makeEmptyDraft(disableInstallation),
  );
  const [vaultDialogOpen, setVaultDialogOpen] = useState(false);

  useEffect(() => {
    if (open) {
      setDraft(initial ?? makeEmptyDraft(disableInstallation));
    }
  }, [open, initial, disableInstallation]);

  const trimmedKey = draft.key.trim();
  const duplicate = useMemo(
    () => existingKeys.includes(trimmedKey) && trimmedKey.length > 0,
    [existingKeys, trimmedKey],
  );

  const hasStoredSecret =
    mode === "edit" &&
    draft.type === "secret" &&
    secretKeysWithStoredValue?.has(trimmedKey) === true;

  const isVaultRef =
    useExternalSecretsManager &&
    draft.type === "secret" &&
    draft.scope === "static" &&
    draft.value.length > 0;

  const valueRequired =
    draft.scope === "static" && !hasStoredSecret && !(draft.type === "boolean");

  const canSubmit =
    trimmedKey.length > 0 &&
    !duplicate &&
    (!valueRequired || draft.value.trim().length > 0);

  function updateDraft(patch: Partial<EnvVarDraft>) {
    setDraft((prev) => {
      const next = { ...prev, ...patch };
      if (patch.scope === "installation") {
        next.required = true;
      } else if (patch.scope) {
        next.required = false;
      }
      if (patch.scope && patch.scope !== "static") {
        next.value = "";
      }
      if (patch.type && patch.type !== prev.type) {
        next.value = patch.type === "boolean" ? "false" : "";
      }
      return next;
    });
  }

  function submit() {
    if (!canSubmit) return;
    onConfirm({ ...draft, key: trimmedKey });
  }

  return (
    <StandardDialog
      open={open}
      onOpenChange={(next) => {
        if (!next) onClose();
      }}
      size="small"
      title={
        mode === "add"
          ? "Add environment variable"
          : "Edit environment variable"
      }
      description={
        mode === "add"
          ? "Configure how this variable is supplied to the MCP server."
          : undefined
      }
      footer={
        <>
          <Button type="button" variant="outline" onClick={onClose}>
            Cancel
          </Button>
          <Button type="button" onClick={submit} disabled={!canSubmit}>
            {mode === "add" ? "Add variable" : "Save"}
          </Button>
        </>
      }
    >
      <div className="space-y-4">
        <div className="space-y-2">
          <Label htmlFor="env-var-key">Key</Label>
          <Input
            id="env-var-key"
            value={draft.key}
            onChange={(e) => updateDraft({ key: e.target.value })}
            placeholder="API_KEY"
            className="font-mono"
            autoComplete={MCP_CONFIG_AUTOCOMPLETE}
          />
          {duplicate && (
            <p className="text-xs text-destructive">
              A variable named &quot;{trimmedKey}&quot; already exists.
            </p>
          )}
        </div>

        <div className="grid grid-cols-2 gap-3">
          <div className="space-y-2">
            <Label htmlFor="env-var-type">Type</Label>
            <Select
              value={draft.type}
              onValueChange={(v) => updateDraft({ type: v as EnvVarType })}
            >
              <SelectTrigger
                id="env-var-type"
                data-testid={E2eTestId.SelectEnvironmentVariableType}
              >
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="plain_text">Plain text</SelectItem>
                <SelectItem value="secret">Secret</SelectItem>
                <SelectItem value="boolean">Boolean</SelectItem>
                <SelectItem value="number">Number</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="space-y-2">
            <Label>Scope</Label>
            <FieldScopeSelect
              value={draft.scope}
              onChange={(scope) => updateDraft({ scope })}
              disableInstallation={disableInstallation}
              disabledReason={disableInstallationReason}
            />
          </div>
        </div>

        {draft.scope === "installation" && (
          <ScopeCallout
            title="The user enters this when installing"
            body={
              <>
                They&apos;ll see a field labeled{" "}
                <span className="font-mono">
                  &quot;{trimmedKey || "KEY"}&quot;
                </span>{" "}
                and your description below as the helper text.
              </>
            }
          />
        )}
        {draft.scope === "preset" && (
          <ScopeCallout
            title={`An admin sets this for each ${singular}`}
            body={`Each ${singular} that uses this server supplies its own value.`}
          />
        )}
        {draft.scope === "static" && (
          <StaticValueEditor
            draft={draft}
            hasStoredSecret={hasStoredSecret}
            isVaultRef={isVaultRef}
            useExternalSecretsManager={useExternalSecretsManager}
            onOpenVault={() => setVaultDialogOpen(true)}
            onClearVault={() => updateDraft({ value: "" })}
            onValueChange={(value) => updateDraft({ value })}
          />
        )}

        {draft.scope === "installation" && (
          <RequiredToggleCard
            checked={draft.required}
            onChange={(required) => updateDraft({ required })}
          />
        )}

        <div className="space-y-2">
          <Label htmlFor="env-var-description">Description</Label>
          <Textarea
            id="env-var-description"
            value={draft.description}
            onChange={(e) => updateDraft({ description: e.target.value })}
            placeholder="Optional description"
            rows={2}
          />
        </div>
      </div>

      {useExternalSecretsManager && vaultDialogOpen && (
        <VaultPickerDialog
          envKey={trimmedKey || "field"}
          initialValue={isVaultRef ? draft.value : undefined}
          onClose={() => setVaultDialogOpen(false)}
          onConfirm={(ref) => {
            updateDraft({ value: ref });
            setVaultDialogOpen(false);
          }}
        />
      )}
    </StandardDialog>
  );
}

function ScopeCallout({
  title,
  body,
}: {
  title: string;
  body: React.ReactNode;
}) {
  return (
    <div className="flex items-start gap-3 rounded-md border border-primary/20 bg-primary/5 p-3">
      <Info className="mt-0.5 h-4 w-4 shrink-0 text-primary" />
      <div className="space-y-0.5 text-xs">
        <div className="font-medium text-foreground">{title}</div>
        <div className="text-muted-foreground">{body}</div>
      </div>
    </div>
  );
}

function RequiredToggleCard({
  checked,
  onChange,
}: {
  checked: boolean;
  onChange: (value: boolean) => void;
}) {
  return (
    <div className="flex items-center justify-between gap-3 rounded-md border border-border p-3">
      <div className="space-y-0.5">
        <div className="text-sm font-medium">Required variable</div>
        <div className="text-xs text-muted-foreground">
          Block installation until the user supplies a value.
        </div>
      </div>
      <Switch
        checked={checked}
        onCheckedChange={onChange}
        aria-label="Required variable"
      />
    </div>
  );
}

function StaticValueEditor({
  draft,
  hasStoredSecret,
  isVaultRef,
  useExternalSecretsManager,
  onOpenVault,
  onClearVault,
  onValueChange,
}: {
  draft: EnvVarDraft;
  hasStoredSecret: boolean;
  isVaultRef: boolean;
  useExternalSecretsManager: boolean;
  onOpenVault: () => void;
  onClearVault: () => void;
  onValueChange: (value: string) => void;
}) {
  if (useExternalSecretsManager && draft.type === "secret") {
    return (
      <div className="space-y-2">
        <Label>Vault secret</Label>
        {isVaultRef ? (
          <div className="flex items-center gap-2">
            <Button
              type="button"
              variant="ghost"
              size="sm"
              className="h-8 px-2 text-xs font-mono text-green-600 hover:text-green-700"
              onClick={onOpenVault}
            >
              <CheckCircle2 className="h-3 w-3 mr-1" />
              <span className="truncate max-w-[200px]">
                {parseVaultReference(draft.value).key}
              </span>
            </Button>
            <Button
              type="button"
              variant="ghost"
              size="sm"
              className="h-8 text-xs"
              onClick={onClearVault}
            >
              Clear
            </Button>
          </div>
        ) : (
          <Button
            type="button"
            variant="outline"
            size="sm"
            className="h-8 text-xs"
            onClick={onOpenVault}
          >
            <Key className="h-3 w-3 mr-1" />
            Set secret
          </Button>
        )}
      </div>
    );
  }

  if (draft.type === "boolean") {
    const checked = draft.value === "true";
    return (
      <Label className="flex cursor-pointer items-center gap-2 rounded-md border border-border p-2.5 hover:bg-muted/30">
        <Checkbox
          checked={checked}
          onCheckedChange={(v) => onValueChange(v === true ? "true" : "false")}
        />
        <span className="text-sm">Value</span>
        <span className="font-mono text-xs text-muted-foreground">
          {checked ? "true" : "false"}
        </span>
      </Label>
    );
  }

  return (
    <div className="space-y-2">
      <Label htmlFor="env-var-value">Value</Label>
      <Input
        id="env-var-value"
        type={draft.type === "secret" ? "password" : "text"}
        inputMode={draft.type === "number" ? "numeric" : undefined}
        value={draft.value}
        onChange={(e) => onValueChange(e.target.value)}
        placeholder={hasStoredSecret ? "••••••••" : "your-value"}
        className="font-mono"
        autoComplete={
          draft.type === "secret"
            ? MCP_SECRET_AUTOCOMPLETE
            : MCP_CONFIG_AUTOCOMPLETE
        }
      />
      {hasStoredSecret && (
        <p className="text-xs text-muted-foreground">
          A value is already stored. Leave blank to keep it, or enter a new
          value to replace.
        </p>
      )}
    </div>
  );
}

function VaultPickerDialog({
  envKey,
  initialValue,
  onClose,
  onConfirm,
}: {
  envKey: string;
  initialValue: string | undefined;
  onClose: () => void;
  onConfirm: (ref: string) => void;
}) {
  const parsed = initialValue ? parseVaultReference(initialValue) : null;
  const [teamId, setTeamId] = useState<string | null>(null);
  const [secretPath, setSecretPath] = useState<string | null>(
    parsed?.path ?? null,
  );
  const [secretKey, setSecretKey] = useState<string | null>(
    parsed?.key ?? null,
  );

  return (
    <StandardDialog
      open
      onOpenChange={(next) => {
        if (!next) onClose();
      }}
      size="small"
      title={
        <span className="flex items-center gap-2">
          <Key className="h-5 w-5" />
          Set external secret
          <span className="font-mono text-muted-foreground">{envKey}</span>
        </span>
      }
      description="Select a secret from your team's external Vault to use for this environment variable."
      footer={
        <>
          <Button type="button" variant="outline" onClick={onClose}>
            Cancel
          </Button>
          <Button
            type="button"
            onClick={() => {
              if (secretPath && secretKey) {
                onConfirm(`${secretPath}#${secretKey}`);
              }
            }}
            disabled={!secretPath || !secretKey}
          >
            Confirm
          </Button>
        </>
      }
    >
      <Suspense
        fallback={
          <div className="flex h-24 items-center justify-center text-muted-foreground">
            <Loader2 className="mr-2 h-4 w-4 animate-spin" />
            Loading...
          </div>
        }
      >
        <ExternalSecretSelector
          selectedTeamId={teamId}
          selectedSecretPath={secretPath}
          selectedSecretKey={secretKey}
          onTeamChange={setTeamId}
          onSecretChange={setSecretPath}
          onSecretKeyChange={setSecretKey}
        />
      </Suspense>
    </StandardDialog>
  );
}
