import { Injectable, inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { firstValueFrom } from 'rxjs';

export type BlogStatus = 'draft' | 'published';

export interface AdminBlogPost {
  id: string;
  title: string;
  bodyMd: string;
  status: BlogStatus;
  createdAt: string;
  updatedAt: string;
  publishedAt: string | null;
}

export interface CreatePostBody {
  title: string;
  bodyMd: string;
  status?: BlogStatus;
}

export interface UpdatePostBody {
  title?: string;
  bodyMd?: string;
  status?: BlogStatus;
}

export interface PublicBlogPost {
  id: string;
  title: string;
  publishedAt: string;
  bodyMd: string;
}

@Injectable({ providedIn: 'root' })
export class BlogApiService {
  private readonly http = inject(HttpClient);

  async listAllPosts(): Promise<AdminBlogPost[]> {
    return firstValueFrom(
      this.http.get<AdminBlogPost[]>('/api/v1/admin/blog/posts', { withCredentials: true }),
    );
  }

  async createPost(body: CreatePostBody): Promise<AdminBlogPost> {
    return firstValueFrom(
      this.http.post<AdminBlogPost>('/api/v1/admin/blog/posts', body, { withCredentials: true }),
    );
  }

  async updatePost(id: string, body: UpdatePostBody): Promise<AdminBlogPost> {
    return firstValueFrom(
      this.http.put<AdminBlogPost>(`/api/v1/admin/blog/posts/${encodeURIComponent(id)}`, body, {
        withCredentials: true,
      }),
    );
  }

  async deletePost(id: string): Promise<void> {
    await firstValueFrom(
      this.http.delete<void>(`/api/v1/admin/blog/posts/${encodeURIComponent(id)}`, {
        withCredentials: true,
      }),
    );
  }

  async listPublished(): Promise<PublicBlogPost[]> {
    const res = await firstValueFrom(
      this.http.get<{ posts: PublicBlogPost[] }>('/api/v1/blog/posts', { withCredentials: true }),
    );
    return res.posts ?? [];
  }
}