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> {
    try {
      const res = await fetch(`${API_BASE}/state`);
      if (!res.ok) throw new Error(`HTTP Error ${res.status}`);
      return res.json();
    } catch (err) {
      console.error('API Error (getState):', err);
      throw err;
    }
  }

  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('Unauthorized or failed to toggle CTF');
  }

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

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

  async updateProfile(data: { password?: string }): Promise<void> {
    const res = await fetch(`${API_BASE}/profile`, {
      method: 'PUT',
      headers: this.getHeaders(),
      body: JSON.stringify(data),
    });
    if (!res.ok) {
      const err = await res.json();
      throw new Error(err.message || '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 }),
    });
    if (!res.ok) throw new Error('Submission failed');
    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 = {};
    if (session) {
      const { token } = JSON.parse(session);
      headers['Authorization'] = `Bearer ${token}`;
    }

    const res = await fetch(url, {
      method,
      headers,
      body: formData,
    });
    if (!res.ok) {
      const err = await res.json().catch(() => ({ message: 'Save failed' }));
      throw new Error(err.message || 'Failed to save challenge');
    }
    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: { title: string, content: string }): Promise<void> {
    const res = await fetch(`${API_BASE}/admin/blogs`, {
      method: 'POST',
      headers: this.getHeaders(),
      body: JSON.stringify(data),
    });
    if (!res.ok) throw new Error('Failed to create blog post');
  }

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

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

export const api = new ApiService();