import { Injectable, Logger } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { HttpService } from '@nestjs/axios';
import { lastValueFrom } from 'rxjs';
import { ArticlesService } from './articles.service';
import { LiveBlogService } from './live-blog.service';
import { CreateArticleDto, CreateLiveBlogDto } from './articles.dto';
import { ArticleStatus, LiveBlogStatus } from './entities';

interface StrapiArticle {
  id: number;
  documentId: string;
  title: string;
  description: string;
  content: string;
  slug: string;
  publishedAt: string | null;
  createdAt: string;
  updatedAt: string;
}

interface StrapiLiveBlog {
  id: number;
  documentId: string;
  title: string;
  description: string;
  slug: string;
  status: 'draft' | 'live' | 'ended' | 'archived';
  publishedAt: string | null;
  createdAt: string;
  updatedAt: string;
}

interface StrapiResponse<T> {
  data: T;
  meta: {
    pagination: {
      page: number;
      pageSize: number;
      pageCount: number;
      total: number;
    };
  };
}

@Injectable()
export class StrapiService {
  private readonly logger = new Logger(StrapiService.name);
  private readonly strapiUrl: string;
  private readonly strapiApiToken: string;

  constructor(
    private readonly configService: ConfigService,
    private readonly httpService: HttpService,
    private readonly articlesService: ArticlesService,
    private readonly liveBlogService: LiveBlogService,
  ) {
    this.strapiUrl =
      this.configService.get<string>('STRAPI_URL') || 'http://localhost:1337';
    this.strapiApiToken =
      this.configService.get<string>('STRAPI_API_TOKEN') || '';
  }

  private getHeaders() {
    const headers: Record<string, string> = {
      'Content-Type': 'application/json',
    };
    if (this.strapiApiToken) {
      headers['Authorization'] = `Bearer ${this.strapiApiToken}`;
    }
    return headers;
  }

  async syncArticles(): Promise<void> {
    try {
      this.logger.log('Starting articles sync from Strapi...');

      const response = await lastValueFrom(
        this.httpService.get<StrapiResponse<StrapiArticle[]>>(
          `${this.strapiUrl}/api/articles`,
          {
            headers: this.getHeaders(),
          },
        ),
      );

      const strapiArticles = response.data.data;
      let syncedCount = 0;

      for (const strapiArticle of strapiArticles) {
        const articleData: Partial<CreateArticleDto> = {
          title: strapiArticle.title,
          excerpt: strapiArticle.description,
          content: strapiArticle.content,
          slug: strapiArticle.slug,
          status: strapiArticle.publishedAt
            ? ArticleStatus.PUBLISHED
            : ArticleStatus.DRAFT,
          tags: [],
        };

        await this.articlesService.syncFromStrapi(
          strapiArticle.documentId,
          articleData,
        );
        syncedCount++;
      }

      this.logger.log(
        `Successfully synced ${syncedCount} articles from Strapi`,
      );
    } catch (error) {
      this.logger.error('Failed to sync articles from Strapi', error);
      throw error;
    }
  }

  async syncSingleArticle(strapiId: string): Promise<void> {
    try {
      this.logger.log(`Syncing single article from Strapi: ${strapiId}`);

      const response = await lastValueFrom(
        this.httpService.get<StrapiResponse<StrapiArticle>>(
          `${this.strapiUrl}/api/articles/${strapiId}`,
          {
            headers: this.getHeaders(),
          },
        ),
      );

      const strapiArticle = response.data.data;
      const articleData: Partial<CreateArticleDto> = {
        title: strapiArticle.title,
        excerpt: strapiArticle.description,
        content: strapiArticle.content,
        slug: strapiArticle.slug,
        status: strapiArticle.publishedAt
          ? ArticleStatus.PUBLISHED
          : ArticleStatus.DRAFT,
        tags: [],
      };

      await this.articlesService.syncFromStrapi(
        strapiArticle.documentId,
        articleData,
      );
      this.logger.log(`Successfully synced article: ${strapiArticle.title}`);
    } catch (error) {
      this.logger.error(
        `Failed to sync article ${strapiId} from Strapi`,
        error,
      );
      throw error;
    }
  }

  async syncLiveBlogs(): Promise<void> {
    try {
      this.logger.log('Starting live blogs sync from Strapi...');

      const response = await lastValueFrom(
        this.httpService.get<StrapiResponse<StrapiLiveBlog[]>>(
          `${this.strapiUrl}/api/live-blogs`,
          {
            headers: this.getHeaders(),
          },
        ),
      );

      const strapiLiveBlogs = response.data.data;
      let syncedCount = 0;

      for (const strapiLiveBlog of strapiLiveBlogs) {
        const liveBlogData: Partial<CreateLiveBlogDto> = {
          title: strapiLiveBlog.title,
          description: strapiLiveBlog.description,
          slug: strapiLiveBlog.slug,
          status: this.mapStrapiStatusToLiveBlogStatus(strapiLiveBlog.status),
        };

        await this.liveBlogService.syncFromStrapi(
          strapiLiveBlog.documentId,
          liveBlogData,
        );
        syncedCount++;
      }

      this.logger.log(
        `Successfully synced ${syncedCount} live blogs from Strapi`,
      );
    } catch (error) {
      this.logger.error('Failed to sync live blogs from Strapi', error);
      throw error;
    }
  }

  async syncSingleLiveBlog(strapiId: string): Promise<void> {
    try {
      this.logger.log(`Syncing single live blog from Strapi: ${strapiId}`);

      const response = await lastValueFrom(
        this.httpService.get<StrapiResponse<StrapiLiveBlog>>(
          `${this.strapiUrl}/api/live-blogs/${strapiId}`,
          {
            headers: this.getHeaders(),
          },
        ),
      );

      const strapiLiveBlog = response.data.data;
      const liveBlogData: Partial<CreateLiveBlogDto> = {
        title: strapiLiveBlog.title,
        description: strapiLiveBlog.description,
        slug: strapiLiveBlog.slug,
        status: this.mapStrapiStatusToLiveBlogStatus(strapiLiveBlog.status),
      };

      await this.liveBlogService.syncFromStrapi(
        strapiLiveBlog.documentId,
        liveBlogData,
      );
      this.logger.log(`Successfully synced live blog: ${strapiLiveBlog.title}`);
    } catch (error) {
      this.logger.error(
        `Failed to sync live blog ${strapiId} from Strapi`,
        error,
      );
      throw error;
    }
  }

  private mapStrapiStatusToLiveBlogStatus(status: string): LiveBlogStatus {
    switch (status) {
      case 'live':
        return LiveBlogStatus.LIVE;
      case 'draft':
        return LiveBlogStatus.DRAFT;
      case 'ended':
        return LiveBlogStatus.ENDED;
      case 'archived':
        return LiveBlogStatus.ARCHIVED;
      default:
        return LiveBlogStatus.DRAFT;
    }
  }

  async handleWebhook(
    event: 'entry.create' | 'entry.update' | 'entry.delete',
    data: { documentId: string; model?: string },
  ): Promise<void> {
    this.logger.log(
      `Received webhook event: ${event} for model: ${data.model}`,
    );

    if (event === 'entry.delete') {
      this.logger.log(`Handling delete for document: ${data.documentId}`);
      return;
    }

    // Route to appropriate sync method based on model
    if (data.model === 'article') {
      await this.syncSingleArticle(data.documentId);
    } else if (data.model === 'live-blog') {
      await this.syncSingleLiveBlog(data.documentId);
    } else {
      this.logger.warn(`Unknown model type in webhook: ${data.model}`);
    }
  }
}