// ========================================
// Command Create Dialog Component
// ========================================
// Modal dialog for creating/importing commands with two modes:
// - Import: import existing command file
// - CLI Generate: AI-generated command from description

import { useState, useCallback } from 'react';
import { useIntl } from 'react-intl';
import {
  Folder,
  User,
  FileCode,
  Sparkles,
  CheckCircle,
  XCircle,
  Loader2,
  Info,
} from 'lucide-react';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogFooter,
  DialogTitle,
  DialogDescription,
} from '@/components/ui/Dialog';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';
import { Textarea } from '@/components/ui/Textarea';
import { Label } from '@/components/ui/Label';
import { validateCommandImport, createCommand } from '@/lib/api';
import { useWorkflowStore, selectProjectPath } from '@/stores/workflowStore';
import { cn } from '@/lib/utils';

export interface CommandCreateDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onCreated: () => void;
  cliType?: 'claude' | 'codex';
}

type CreateMode = 'import' | 'cli-generate';
type CommandLocation = 'project' | 'user';

interface ValidationResult {
  valid: boolean;
  errors?: string[];
  commandInfo?: { name: string; description: string; usage?: string };
}

export function CommandCreateDialog({ open, onOpenChange, onCreated, cliType = 'claude' }: CommandCreateDialogProps) {
  const { formatMessage } = useIntl();
  const projectPath = useWorkflowStore(selectProjectPath);

  const [mode, setMode] = useState<CreateMode>('import');
  const [location, setLocation] = useState<CommandLocation>('project');

  // Import mode state
  const [sourcePath, setSourcePath] = useState('');
  const [customName, setCustomName] = useState('');
  const [validationResult, setValidationResult] = useState<ValidationResult | null>(null);
  const [isValidating, setIsValidating] = useState(false);

  // CLI Generate mode state
  const [commandName, setCommandName] = useState('');
  const [description, setDescription] = useState('');

  const [isCreating, setIsCreating] = useState(false);

  const resetState = useCallback(() => {
    setMode('import');
    setLocation('project');
    setSourcePath('');
    setCustomName('');
    setValidationResult(null);
    setIsValidating(false);
    setCommandName('');
    setDescription('');
    setIsCreating(false);
  }, []);

  const handleOpenChange = useCallback((open: boolean) => {
    if (!open) {
      resetState();
    }
    onOpenChange(open);
  }, [onOpenChange, resetState]);

  const handleValidate = useCallback(async () => {
    if (!sourcePath.trim()) return;

    setIsValidating(true);
    setValidationResult(null);

    try {
      const result = await validateCommandImport(sourcePath.trim());
      setValidationResult(result);
    } catch (err) {
      setValidationResult({
        valid: false,
        errors: [err instanceof Error ? err.message : String(err)],
      });
    } finally {
      setIsValidating(false);
    }
  }, [sourcePath]);

  const handleCreate = useCallback(async () => {
    if (mode === 'import') {
      if (!sourcePath.trim()) return;
      if (!validationResult?.valid) return;
    } else {
      if (!commandName.trim()) return;
      if (!description.trim()) return;
    }

    setIsCreating(true);

    try {
      await createCommand({
        mode,
        location,
        sourcePath: mode === 'import' ? sourcePath.trim() : undefined,
        commandName: mode === 'import' ? (customName.trim() || undefined) : commandName.trim(),
        description: mode === 'cli-generate' ? description.trim() : undefined,
        generationType: mode === 'cli-generate' ? 'description' : undefined,
        projectPath,
        cliType,
      });

      handleOpenChange(false);
      onCreated();
    } catch (err) {
      console.error('Failed to create command:', err);
      if (mode === 'import') {
        setValidationResult({
          valid: false,
          errors: [err instanceof Error ? err.message : formatMessage({ id: 'commands.create.createError' })],
        });
      }
    } finally {
      setIsCreating(false);
    }
  }, [mode, location, sourcePath, customName, commandName, description, validationResult, projectPath, handleOpenChange, onCreated, formatMessage]);

  const canCreate = mode === 'import'
    ? sourcePath.trim() && validationResult?.valid && !isCreating
    : commandName.trim() && description.trim() && !isCreating;

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogContent className="max-w-2xl max-h-[90vh] overflow-y-auto">
        <DialogHeader>
          <DialogTitle>{formatMessage({ id: 'commands.create.title' })}</DialogTitle>
          <DialogDescription>
            {formatMessage({ id: 'commands.description' })}
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-5 py-2">
          {/* Location Selection */}
          <div className="space-y-2">
            <Label>{formatMessage({ id: 'commands.create.location' })}</Label>
            <div className="grid grid-cols-2 gap-3">
              <button
                type="button"
                className={cn(
                  'px-4 py-3 text-left border-2 rounded-lg transition-all',
                  location === 'project'
                    ? 'border-primary bg-primary/10'
                    : 'border-border hover:border-primary/50'
                )}
                onClick={() => setLocation('project')}
              >
                <div className="flex items-center gap-2">
                  <Folder className="w-5 h-5" />
                  <div>
                    <div className="font-medium text-sm">{formatMessage({ id: 'commands.create.locationProject' })}</div>
                    <div className="text-xs text-muted-foreground">{`.${cliType}/commands/`}</div>
                  </div>
                </div>
              </button>
              <button
                type="button"
                className={cn(
                  'px-4 py-3 text-left border-2 rounded-lg transition-all',
                  location === 'user'
                    ? 'border-primary bg-primary/10'
                    : 'border-border hover:border-primary/50'
                )}
                onClick={() => setLocation('user')}
              >
                <div className="flex items-center gap-2">
                  <User className="w-5 h-5" />
                  <div>
                    <div className="font-medium text-sm">{formatMessage({ id: 'commands.create.locationUser' })}</div>
                    <div className="text-xs text-muted-foreground">{`~/.${cliType}/commands/`}</div>
                  </div>
                </div>
              </button>
            </div>
          </div>

          {/* Mode Selection */}
          <div className="space-y-2">
            <Label>{formatMessage({ id: 'commands.create.mode' })}</Label>
            <div className="grid grid-cols-2 gap-3">
              <button
                type="button"
                className={cn(
                  'px-4 py-3 text-left border-2 rounded-lg transition-all',
                  mode === 'import'
                    ? 'border-primary bg-primary/10'
                    : 'border-border hover:border-primary/50'
                )}
                onClick={() => setMode('import')}
              >
                <div className="flex items-center gap-2">
                  <FileCode className="w-5 h-5" />
                  <div>
                    <div className="font-medium text-sm">{formatMessage({ id: 'commands.create.modeImport' })}</div>
                    <div className="text-xs text-muted-foreground">{formatMessage({ id: 'commands.create.modeImportHint' })}</div>
                  </div>
                </div>
              </button>
              <button
                type="button"
                className={cn(
                  'px-4 py-3 text-left border-2 rounded-lg transition-all',
                  mode === 'cli-generate'
                    ? 'border-primary bg-primary/10'
                    : 'border-border hover:border-primary/50'
                )}
                onClick={() => setMode('cli-generate')}
              >
                <div className="flex items-center gap-2">
                  <Sparkles className="w-5 h-5" />
                  <div>
                    <div className="font-medium text-sm">{formatMessage({ id: 'commands.create.modeGenerate' })}</div>
                    <div className="text-xs text-muted-foreground">{formatMessage({ id: 'commands.create.modeGenerateHint' })}</div>
                  </div>
                </div>
              </button>
            </div>
          </div>

          {/* Import Mode Content */}
          {mode === 'import' && (
            <div className="space-y-4">
              <div className="space-y-2">
                <Label htmlFor="sourcePath">{formatMessage({ id: 'commands.create.sourcePath' })}</Label>
                <Input
                  id="sourcePath"
                  value={sourcePath}
                  onChange={(e) => {
                    setSourcePath(e.target.value);
                    setValidationResult(null);
                  }}
                  placeholder={formatMessage({ id: 'commands.create.sourcePathPlaceholder' })}
                  className="font-mono text-sm"
                />
                <p className="text-xs text-muted-foreground">{formatMessage({ id: 'commands.create.sourcePathHint' })}</p>
              </div>

              <div className="space-y-2">
                <Label htmlFor="customName">
                  {formatMessage({ id: 'commands.create.customName' })}
                  <span className="text-muted-foreground ml-1">({formatMessage({ id: 'commands.create.customNameHint' })})</span>
                </Label>
                <Input
                  id="customName"
                  value={customName}
                  onChange={(e) => setCustomName(e.target.value)}
                  placeholder={formatMessage({ id: 'commands.create.customNamePlaceholder' })}
                />
              </div>

              {/* Validation Result */}
              {isValidating && (
                <div className="flex items-center gap-2 p-3 bg-muted/50 rounded-lg">
                  <Loader2 className="w-4 h-4 animate-spin" />
                  <span className="text-sm text-muted-foreground">{formatMessage({ id: 'commands.create.validating' })}</span>
                </div>
              )}
              {validationResult && !isValidating && (
                validationResult.valid ? (
                  <div className="p-4 bg-green-500/10 border border-green-500/20 rounded-lg">
                    <div className="flex items-center gap-2 text-green-600 mb-2">
                      <CheckCircle className="w-5 h-5" />
                      <span className="font-medium">{formatMessage({ id: 'commands.create.validCommand' })}</span>
                    </div>
                    {validationResult.commandInfo && (
                      <div className="space-y-1 text-sm">
                        <div>
                          <span className="text-muted-foreground">{formatMessage({ id: 'commands.card.name' })}: </span>
                          <span>{validationResult.commandInfo.name}</span>
                        </div>
                        {validationResult.commandInfo.description && (
                          <div>
                            <span className="text-muted-foreground">{formatMessage({ id: 'commands.card.description' })}: </span>
                            <span>{validationResult.commandInfo.description}</span>
                          </div>
                        )}
                        {validationResult.commandInfo.usage && (
                          <div>
                            <span className="text-muted-foreground">{formatMessage({ id: 'commands.card.usage' })}: </span>
                            <span>{validationResult.commandInfo.usage}</span>
                          </div>
                        )}
                      </div>
                    )}
                  </div>
                ) : (
                  <div className="p-4 bg-destructive/10 border border-destructive/20 rounded-lg">
                    <div className="flex items-center gap-2 text-destructive mb-2">
                      <XCircle className="w-5 h-5" />
                      <span className="font-medium">{formatMessage({ id: 'commands.create.invalidCommand' })}</span>
                    </div>
                    {validationResult.errors && (
                      <ul className="space-y-1 text-sm">
                        {validationResult.errors.map((error, i) => (
                          <li key={i} className="text-destructive">{error}</li>
                        ))}
                      </ul>
                    )}
                  </div>
                )
              )}
            </div>
          )}

          {/* CLI Generate Mode Content */}
          {mode === 'cli-generate' && (
            <div className="space-y-4">
              <div className="space-y-2">
                <Label htmlFor="commandName">
                  {formatMessage({ id: 'commands.create.commandName' })} <span className="text-destructive">*</span>
                </Label>
                <Input
                  id="commandName"
                  value={commandName}
                  onChange={(e) => setCommandName(e.target.value)}
                  placeholder={formatMessage({ id: 'commands.create.commandNamePlaceholder' })}
                />
                <p className="text-xs text-muted-foreground">{formatMessage({ id: 'commands.create.commandNameHint' })}</p>
              </div>

              <div className="space-y-2">
                <Label htmlFor="description">
                  {formatMessage({ id: 'commands.create.descriptionLabel' })} <span className="text-destructive">*</span>
                </Label>
                <Textarea
                  id="description"
                  value={description}
                  onChange={(e) => setDescription(e.target.value)}
                  placeholder={formatMessage({ id: 'commands.create.descriptionPlaceholder' })}
                  rows={6}
                />
                <p className="text-xs text-muted-foreground">{formatMessage({ id: 'commands.create.descriptionHint' })}</p>
              </div>

              <div className="p-3 bg-blue-500/10 border border-blue-500/20 rounded-lg">
                <div className="flex items-start gap-2">
                  <Info className="w-4 h-4 text-blue-600 mt-0.5" />
                  <div className="text-sm text-blue-600">
                    <p className="font-medium">{formatMessage({ id: 'commands.create.generateInfo' })}</p>
                    <p className="text-xs mt-1">{formatMessage({ id: 'commands.create.generateTimeHint' })}</p>
                  </div>
                </div>
              </div>
            </div>
          )}
        </div>

        <DialogFooter className="gap-2">
          <Button variant="outline" onClick={() => handleOpenChange(false)} disabled={isCreating}>
            {formatMessage({ id: 'commands.actions.cancel' })}
          </Button>
          {mode === 'import' && (
            <Button
              variant="outline"
              onClick={handleValidate}
              disabled={!sourcePath.trim() || isValidating || isCreating}
            >
              {isValidating && <Loader2 className="w-4 h-4 mr-2 animate-spin" />}
              {formatMessage({ id: 'commands.create.validate' })}
            </Button>
          )}
          <Button
            onClick={handleCreate}
            disabled={!canCreate}
          >
            {isCreating && <Loader2 className="w-4 h-4 mr-2 animate-spin" />}
            {isCreating
              ? formatMessage({ id: 'commands.create.creating' })
              : mode === 'import'
                ? formatMessage({ id: 'commands.create.import' })
                : formatMessage({ id: 'commands.create.generate' })
            }
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

export default CommandCreateDialog;