const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'https://api.sojorn.net';

class ApiClient {
  private token: string | null = null;

  setToken(token: string | null) {
    this.token = token;
    if (token) {
      if (typeof window !== 'undefined') localStorage.setItem('admin_token', token);
    } else {
      if (typeof window !== 'undefined') localStorage.removeItem('admin_token');
    }
  }

  getToken(): string | null {
    if (this.token) return this.token;
    if (typeof window !== 'undefined') {
      this.token = localStorage.getItem('admin_token');
    }
    return this.token;
  }

  private async request<T>(path: string, options: RequestInit = {}): Promise<T> {
    const token = this.getToken();
    const headers: Record<string, string> = {
      'Content-Type': 'application/json',
      ...(options.headers as Record<string, string>),
    };
    if (token) {
      headers['Authorization'] = `Bearer ${token}`;
    }

    const res = await fetch(`${API_BASE}${path}`, {
      ...options,
      headers,
    });

    if (res.status === 401) {
      this.setToken(null);
      if (typeof window !== 'undefined') {
        window.location.href = '/login';
      }
      throw new Error('Unauthorized');
    }

    if (!res.ok) {
      const body = await res.json().catch(() => ({ error: res.statusText }));
      throw new Error(body.error || `Request failed: ${res.status}`);
    }

    return res.json();
  }

  // Auth
  async login(email: string, password: string) {
    const data = await this.request<{ access_token: string; user: any }>('/api/v1/auth/login', {
      method: 'POST',
      body: JSON.stringify({ email, password }),
    });
    this.setToken(data.access_token);
    return data;
  }

  // Dashboard
  async getDashboardStats() {
    return this.request<any>('/api/v1/admin/dashboard');
  }

  async getGrowthStats(days = 30) {
    return this.request<any>(`/api/v1/admin/growth?days=${days}`);
  }

  // Users
  async listUsers(params: { limit?: number; offset?: number; search?: string; status?: string; role?: string } = {}) {
    const qs = new URLSearchParams();
    if (params.limit) qs.set('limit', String(params.limit));
    if (params.offset) qs.set('offset', String(params.offset));
    if (params.search) qs.set('search', params.search);
    if (params.status) qs.set('status', params.status);
    if (params.role) qs.set('role', params.role);
    return this.request<any>(`/api/v1/admin/users?${qs}`);
  }

  async getUser(id: string) {
    return this.request<any>(`/api/v1/admin/users/${id}`);
  }

  async updateUserStatus(id: string, status: string, reason: string) {
    return this.request<any>(`/api/v1/admin/users/${id}/status`, {
      method: 'PATCH',
      body: JSON.stringify({ status, reason }),
    });
  }

  async updateUserRole(id: string, role: string) {
    return this.request<any>(`/api/v1/admin/users/${id}/role`, {
      method: 'PATCH',
      body: JSON.stringify({ role }),
    });
  }

  async updateUserVerification(id: string, isOfficial: boolean, isVerified: boolean) {
    return this.request<any>(`/api/v1/admin/users/${id}/verification`, {
      method: 'PATCH',
      body: JSON.stringify({ is_official: isOfficial, is_verified: isVerified }),
    });
  }

  async resetUserStrikes(id: string) {
    return this.request<any>(`/api/v1/admin/users/${id}/reset-strikes`, { method: 'POST' });
  }

  // Posts
  async listPosts(params: { limit?: number; offset?: number; search?: string; status?: string; author_id?: string } = {}) {
    const qs = new URLSearchParams();
    if (params.limit) qs.set('limit', String(params.limit));
    if (params.offset) qs.set('offset', String(params.offset));
    if (params.search) qs.set('search', params.search);
    if (params.status) qs.set('status', params.status);
    if (params.author_id) qs.set('author_id', params.author_id);
    return this.request<any>(`/api/v1/admin/posts?${qs}`);
  }

  async getPost(id: string) {
    return this.request<any>(`/api/v1/admin/posts/${id}`);
  }

  async updatePostStatus(id: string, status: string, reason?: string) {
    return this.request<any>(`/api/v1/admin/posts/${id}/status`, {
      method: 'PATCH',
      body: JSON.stringify({ status, reason }),
    });
  }

  async deletePost(id: string) {
    return this.request<any>(`/api/v1/admin/posts/${id}`, { method: 'DELETE' });
  }

  // Moderation
  async getModerationQueue(params: { limit?: number; offset?: number; status?: string } = {}) {
    const qs = new URLSearchParams();
    if (params.limit) qs.set('limit', String(params.limit));
    if (params.offset) qs.set('offset', String(params.offset));
    if (params.status) qs.set('status', params.status || 'pending');
    return this.request<any>(`/api/v1/admin/moderation?${qs}`);
  }

  async reviewModerationFlag(id: string, action: string, reason?: string) {
    return this.request<any>(`/api/v1/admin/moderation/${id}/review`, {
      method: 'PATCH',
      body: JSON.stringify({ action, reason }),
    });
  }

  // Appeals
  async listAppeals(params: { limit?: number; offset?: number; status?: string } = {}) {
    const qs = new URLSearchParams();
    if (params.limit) qs.set('limit', String(params.limit));
    if (params.offset) qs.set('offset', String(params.offset));
    if (params.status) qs.set('status', params.status || 'pending');
    return this.request<any>(`/api/v1/admin/appeals?${qs}`);
  }

  async reviewAppeal(id: string, decision: string, reviewDecision: string, restoreContent = false) {
    return this.request<any>(`/api/v1/admin/appeals/${id}/review`, {
      method: 'PATCH',
      body: JSON.stringify({ decision, review_decision: reviewDecision, restore_content: restoreContent }),
    });
  }

  // Reports
  async listReports(params: { limit?: number; offset?: number; status?: string } = {}) {
    const qs = new URLSearchParams();
    if (params.limit) qs.set('limit', String(params.limit));
    if (params.offset) qs.set('offset', String(params.offset));
    if (params.status) qs.set('status', params.status || 'pending');
    return this.request<any>(`/api/v1/admin/reports?${qs}`);
  }

  async updateReportStatus(id: string, status: string) {
    return this.request<any>(`/api/v1/admin/reports/${id}`, {
      method: 'PATCH',
      body: JSON.stringify({ status }),
    });
  }

  // Algorithm
  async getAlgorithmConfig() {
    return this.request<any>('/api/v1/admin/algorithm');
  }

  async updateAlgorithmConfig(key: string, value: string) {
    return this.request<any>('/api/v1/admin/algorithm', {
      method: 'PUT',
      body: JSON.stringify({ key, value }),
    });
  }

  // Categories
  async listCategories() {
    return this.request<any>('/api/v1/admin/categories');
  }

  async createCategory(data: { slug: string; name: string; description?: string; is_sensitive?: boolean }) {
    return this.request<any>('/api/v1/admin/categories', {
      method: 'POST',
      body: JSON.stringify(data),
    });
  }

  async updateCategory(id: string, data: { name?: string; description?: string; is_sensitive?: boolean }) {
    return this.request<any>(`/api/v1/admin/categories/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(data),
    });
  }

  // System
  async getSystemHealth() {
    return this.request<any>('/api/v1/admin/health');
  }

  async getAuditLog(params: { limit?: number; offset?: number } = {}) {
    const qs = new URLSearchParams();
    if (params.limit) qs.set('limit', String(params.limit));
    if (params.offset) qs.set('offset', String(params.offset));
    return this.request<any>(`/api/v1/admin/audit-log?${qs}`);
  }
}

export const api = new ApiClient();