import {
  Controller,
  Get,
  Put,
  Body,
  UseGuards,
  UsePipes,
  ValidationPipe,
  Param,
} from '@nestjs/common';
import { AuthGuard, CurrentUser } from '@mana-core/nestjs-integration';
import { UserToken } from '../decorators/user.decorator';
import { SettingsClientService, UserSettings } from './settings-client.service';
import { SettingsService } from '../core/services/settings.service';
import { JwtPayload } from '../types/jwt-payload.interface';
import { UpdateUserSettingsDto } from './dto/settings.dto';
import { ImageModelId } from '../core/models/image-models';

@Controller('settings')
@UseGuards(AuthGuard)
export class SettingsController {
  constructor(
    private readonly settingsClientService: SettingsClientService,
    private readonly settingsService: SettingsService,
  ) {}

  /**
   * Get user-specific settings
   */
  @Get('user')
  async getUserSettings(
    @CurrentUser() user: JwtPayload,
    @UserToken() token: string,
  ): Promise<{ userId: string; settings: UserSettings }> {
    const settings = await this.settingsClientService.getUserSettings(token);
    return {
      userId: user.sub,
      settings: settings || {
        // Default settings if none exist
        preferences: {
          language: 'en',
          timezone: 'UTC',
          dateFormat: 'MM/DD/YYYY',
        },
        maerchenzauber: {
          language: 'de',
          storyLength: 'medium',
          ageGroup: '4-6',
        },
      },
    };
  }

  /**
   * Get available image generation models
   */
  @Get('image-models')
  async getAvailableImageModels() {
    const models = this.settingsService.getAvailableImageModels();
    return {
      models,
      default: 'imagen-4-fast',
      categories: {
        budget: models.filter((m) => m.category === 'budget'),
        standard: models.filter((m) => m.category === 'standard'),
        premium: models.filter((m) => m.category === 'premium'),
        specialty: models.filter((m) => m.category === 'specialty'),
      },
    };
  }

  /**
   * Get user's selected image model
   */
  @Get('user/image-model')
  async getUserImageModel(@CurrentUser() user: JwtPayload) {
    const result = await this.settingsService.getUserImageModel(user.sub);
    if (result.error) {
      return {
        model: 'imagen-4-fast',
        error: result.error.message,
      };
    }
    return {
      model: result.data,
      modelInfo: this.settingsService.getImageModelInfo(result.data!),
    };
  }

  /**
   * Update user's selected image model
   */
  @Put('user/image-model')
  async updateUserImageModel(
    @CurrentUser() user: JwtPayload,
    @Body('model') modelId: ImageModelId,
  ) {
    const result = await this.settingsService.setUserImageModel(
      user.sub,
      modelId,
    );
    if (result.error) {
      return {
        success: false,
        error: result.error.message,
      };
    }
    return {
      success: true,
      model: modelId,
      modelInfo: this.settingsService.getImageModelInfo(modelId),
    };
  }

  /**
   * Update user-specific settings
   */
  @Put('user')
  @UsePipes(ValidationPipe)
  async updateUserSettings(
    @CurrentUser() user: JwtPayload,
    @UserToken() token: string,
    @Body() settings: UpdateUserSettingsDto,
  ) {
    await this.settingsClientService.updateServiceSettings(
      settings as any,
      token,
    );

    return {
      success: true,
      userId: user.sub,
      settings,
    };
  }

  /**
   * Get app-wide settings (public)
   */
  @Get('app')
  async getAppSettings() {
    const settings = this.settingsService.getAllSettings();
    return {
      app: 'storyteller',
      version: '1.0.0',
      settings: {
        features: {
          aiStoryGeneration: true,
          characterCreation: true,
          imageGeneration: true,
          collaborativeStories: false, // Coming soon
          voiceNarration: false, // Coming soon
        },
        limits: {
          maxCharactersPerUser: 50,
          maxStoriesPerUser: 100,
          maxPagesPerStory: 20,
          maxImageGenerationsPerDay: 10,
        },
        costs: {
          characterCreation: 5,
          storyGeneration: 10,
          imageGeneration: 3,
          voiceNarration: 15,
        },
        ...settings,
      },
    };
  }

  /**
   * Get feature flags
   */
  @Get('features')
  async getFeatureFlags(@CurrentUser() user: JwtPayload) {
    // Check user-specific feature flags
    const userRole = user.role || 'user';

    return {
      userId: user.sub,
      role: userRole,
      features: {
        // Core features
        createCharacter: true,
        createStory: true,
        generateImages: true,

        // Premium features (role-based)
        unlimitedStories: userRole === 'premium' || userRole === 'admin',
        voiceNarration: userRole === 'premium' || userRole === 'admin',
        collaborativeMode: false, // Not implemented yet

        // Beta features
        betaFeatures: userRole === 'admin',
        debugMode: userRole === 'admin',
      },
    };
  }

  /**
   * Get creators list (for story creation)
   */
  @Get('creators')
  async getCreators() {
    const creators = this.settingsService.getCreators();
    const authors = creators.filter((c) => c.type === 'author');
    const illustrators = creators.filter((c) => c.type === 'illustrator');

    return {
      authors,
      illustrators,
      total: creators.length,
    };
  }

  /**
   * Get creators by type
   */
  @Get('creators/:type')
  async getCreatorsByType(@Param('type') type: 'author' | 'illustrator') {
    if (type !== 'author' && type !== 'illustrator') {
      return {
        error: 'Invalid creator type. Must be "author" or "illustrator"',
      };
    }

    const creators = this.settingsService.getCreatorsByType(type);
    return {
      creators,
      type,
      count: creators.length,
    };
  }

  /**
   * Get supported languages
   */
  @Get('languages')
  async getSupportedLanguages() {
    return {
      languages: [
        { code: 'en', name: 'English', flag: '🇺🇸' },
        { code: 'de', name: 'Deutsch', flag: '🇩🇪' },
        { code: 'es', name: 'Español', flag: '🇪🇸' },
        { code: 'fr', name: 'Français', flag: '🇫🇷' },
        { code: 'it', name: 'Italiano', flag: '🇮🇹' },
      ],
      default: 'en',
    };
  }

  /**
   * Get theme options
   */
  @Get('themes')
  async getThemeOptions() {
    return {
      themes: [
        {
          id: 'light',
          name: 'Light Mode',
          description: 'Default light theme',
        },
        {
          id: 'dark',
          name: 'Dark Mode',
          description: 'Easy on the eyes',
        },
        {
          id: 'kids',
          name: 'Kids Mode',
          description: 'Colorful and playful',
        },
      ],
      default: 'light',
    };
  }
}