import { Challenge, Team, Solve, CTFState, BlogPost } from '../types';

const API_BASE = '/api';

class ApiService {
  private getHeaders() {
    const session = localStorage.getItem('hip6_session');
    const headers: HeadersInit = { 'Content-Type': 'application/json' };
    if (session) {
      const { token } = JSON.parse(session);
      if (token) headers['Authorization'] = `Bearer ${token}`;
    }
    return headers;
  }

  async getState(): Promise<CTFState> {
    const res = await fetch(`${API_BASE}/state`);
    if (!res.ok) throw new Error(`HTTP Error ${res.status}`);
    return res.json();
  }

  async login(name: string, pass: string): Promise<{ team: Team, token: string }> {
    const res = await fetch(`${API_BASE}/auth/login`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ name, password: pass }),
    });
    if (!res.ok) {
      const err = await res.json();
      throw new Error(err.message || 'Invalid credentials');
    }
    return res.json();
  }

  async register(name: string, pass: string): Promise<{ team: Team, token: string }> {
    const res = await fetch(`${API_BASE}/auth/register`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ name, password: pass }),
    });
    if (!res.ok) {
      const err = await res.json();
      throw new Error(err.message || 'Registration failed');
    }
    return res.json();
  }

  async toggleCtf(): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/toggle-ctf`, {
      method: 'POST',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Failed to toggle CTF');
  }

  async resetScores(): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/reset-scores`, {
      method: 'POST',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Failed to reset scores');
  }

  async backupDatabase(): Promise<any> {
    const res = await fetch(`${API_BASE}/admin/db/export`, {
      method: 'GET',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Backup failed');
    return res.json();
  }

  async restoreDatabase(file: File): Promise<void> {
    const formData = new FormData();
    formData.append('restoreFile', file);
    const session = localStorage.getItem('hip6_session');
    const headers: HeadersInit = session ? { 'Authorization': `Bearer ${JSON.parse(session).token}` } : {};
    const res = await fetch(`${API_BASE}/admin/db/restore`, { method: 'POST', headers, body: formData });
    if (!res.ok) throw new Error('Restore failed');
  }

  async exportChallenges(): Promise<{ challenges: any[] }> {
    const res = await fetch(`${API_BASE}/admin/challenges/export`, {
      method: 'GET',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Export failed');
    return res.json();
  }

  async importChallenges(file: File): Promise<void> {
    const formData = new FormData();
    formData.append('importFile', file);
    const session = localStorage.getItem('hip6_session');
    const headers: HeadersInit = session ? { 'Authorization': `Bearer ${JSON.parse(session).token}` } : {};
    const res = await fetch(`${API_BASE}/admin/challenges/import`, { method: 'POST', headers, body: formData });
    if (!res.ok) throw new Error('Import failed');
  }

  async deleteAllChallenges(): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/challenges/all`, {
      method: 'DELETE',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Failed to delete all challenges');
  }

  async updateConfig(formData: FormData): Promise<void> {
    const session = localStorage.getItem('hip6_session');
    const headers: HeadersInit = session ? { 'Authorization': `Bearer ${JSON.parse(session).token}` } : {};
    const res = await fetch(`${API_BASE}/admin/config`, { method: 'PUT', headers, body: formData });
    if (!res.ok) throw new Error('Failed to update config');
  }

  async updateTeam(id: string, data: any): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/teams/${id}`, {
      method: 'PUT',
      headers: this.getHeaders(),
      body: JSON.stringify(data),
    });
    if (!res.ok) throw new Error('Failed to update team');
  }

  async updateProfile(data: any): Promise<void> {
    const res = await fetch(`${API_BASE}/profile`, {
      method: 'PUT',
      headers: this.getHeaders(),
      body: JSON.stringify(data),
    });
    if (!res.ok) throw new Error('Failed to update profile');
  }

  async deleteTeam(id: string): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/teams/${id}`, {
      method: 'DELETE',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Failed to delete team');
  }

  async submitFlag(challengeId: string, flag: string): Promise<{ success: boolean }> {
    const res = await fetch(`${API_BASE}/challenges/submit`, {
      method: 'POST',
      headers: this.getHeaders(),
      body: JSON.stringify({ challengeId, flag }),
    });
    return res.json();
  }

  async upsertChallenge(formData: FormData, id?: string): Promise<any> {
    const method = id ? 'PUT' : 'POST';
    const url = id ? `${API_BASE}/admin/challenges/${id}` : `${API_BASE}/admin/challenges`;
    const session = localStorage.getItem('hip6_session');
    const headers: HeadersInit = session ? { 'Authorization': `Bearer ${JSON.parse(session).token}` } : {};
    const res = await fetch(url, { method, headers, body: formData });
    return res.json();
  }

  async deleteChallenge(id: string): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/challenges/${id}`, {
      method: 'DELETE',
      headers: this.getHeaders(),
    });
    if (!res.ok) throw new Error('Failed to delete challenge');
  }

  async createBlogPost(data: any): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/blogs`, {
      method: 'POST',
      headers: this.getHeaders(),
      body: JSON.stringify(data),
    });
  }

  async updateBlogPost(id: string, data: any): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/blogs/${id}`, {
      method: 'PUT',
      headers: this.getHeaders(),
      body: JSON.stringify(data),
    });
  }

  async deleteBlogPost(id: string): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/blogs/${id}`, {
      method: 'DELETE',
      headers: this.getHeaders(),
    });
  }
}

export const api = new ApiService();