import { api } from '../api';

// Users API
export interface User {
  id: string;
  email: string;
  username: string;
  isActive: boolean;
  lastLogin?: string | null;
  employeeId?: string | null;
  employee?: {
    id: string;
    firstName: string;
    lastName: string;
    firstNameAr?: string | null;
    lastNameAr?: string | null;
    position?: { id: string; title: string; titleAr?: string | null };
    department?: { name: string; nameAr?: string | null };
  };
  createdAt: string;
  updatedAt: string;
}

export interface CreateUserData {
  email: string;
  username: string;
  password: string;
  employeeId: string;
  isActive?: boolean;
}

export interface UpdateUserData {
  email?: string;
  username?: string;
  password?: string;
  employeeId?: string | null;
  isActive?: boolean;
}

export interface UserFilters {
  search?: string;
  status?: 'active' | 'inactive';
  positionId?: string;
  page?: number;
  pageSize?: number;
}

export interface PaginatedResponse<T> {
  success: boolean;
  data: T[];
  pagination: {
    total: number;
    page: number;
    pageSize: number;
    totalPages: number;
  };
}

export const usersAPI = {
  getAll: async (filters?: UserFilters): Promise<PaginatedResponse<User>> => {
    const params = new URLSearchParams();
    if (filters?.search) params.append('search', filters.search);
    if (filters?.status) params.append('status', filters.status);
    if (filters?.positionId) params.append('positionId', filters.positionId);
    if (filters?.page) params.append('page', String(filters.page));
    if (filters?.pageSize) params.append('pageSize', String(filters.pageSize));

    const response = await api.get(`/admin/users?${params.toString()}`);
    return {
      success: true,
      data: response.data.data || [],
      pagination: response.data.pagination || { total: 0, page: 1, pageSize: 20, totalPages: 0 },
    };
  },

  getById: async (id: string): Promise<User> => {
    const response = await api.get(`/admin/users/${id}`);
    return response.data.data;
  },

  create: async (data: CreateUserData): Promise<User> => {
    const response = await api.post('/admin/users', data);
    return response.data.data;
  },

  update: async (id: string, data: UpdateUserData): Promise<User> => {
    const response = await api.put(`/admin/users/${id}`, data);
    return response.data.data;
  },

  toggleActive: async (id: string): Promise<User> => {
    const response = await api.patch(`/admin/users/${id}/toggle-active`);
    return response.data.data;
  },

  delete: async (id: string): Promise<void> => {
    await api.delete(`/admin/users/${id}`);
  },
};

// Stats API
export interface AdminStats {
  totalUsers: number;
  activeUsers: number;
  inactiveUsers: number;
  loginsToday: number;
}

export const statsAPI = {
  get: async (): Promise<AdminStats> => {
    const response = await api.get('/admin/stats');
    return response.data.data || response.data;
  },
};

// Positions (Roles) API - maps to HR positions with permissions
export interface PositionPermission {
  id: string;
  module: string;
  resource: string;
  actions: string[];
}

export interface PositionRole {
  id: string;
  title: string;
  titleAr?: string | null;
  code: string;
  department?: { name: string; nameAr?: string | null };
  permissions: PositionPermission[];
  usersCount: number;
  _count?: { employees: number };
}

export interface CreatePositionData {
  title: string;
  titleAr?: string;
  code: string;
  departmentId: string;
  level?: number;
  description?: string;
}

export const positionsAPI = {
  getAll: async (): Promise<PositionRole[]> => {
    const response = await api.get('/admin/positions');
    return response.data.data || [];
  },

  create: async (data: CreatePositionData): Promise<PositionRole> => {
    const response = await api.post('/admin/positions', data);
    return response.data.data;
  },

  update: async (
    id: string,
    data: Partial<CreatePositionData & { isActive?: boolean }>
  ): Promise<PositionRole> => {
    const response = await api.put(`/admin/positions/${id}`, data);
    return response.data.data;
  },

  updatePermissions: async (
    positionId: string,
    permissions: Array<{ module: string; resource: string; actions: string[] }>
  ): Promise<PositionRole> => {
    const response = await api.put(`/admin/positions/${positionId}/permissions`, {
      permissions,
    });
    return response.data.data;
  },
};

// Roles API - alias for positions (for compatibility with existing frontend)
export interface Role {
  id: string;
  name: string;
  nameAr?: string;
  title?: string;
  titleAr?: string;
  permissions: { id?: string; module: string; resource: string; actions: string[] }[];
  usersCount?: number;
}

export const rolesAPI = {
  getAll: async (): Promise<Role[]> => {
    const positions = await positionsAPI.getAll();
    return positions.map((p) => ({
      id: p.id,
      name: p.title,
      nameAr: p.titleAr || undefined,
      title: p.title,
      titleAr: p.titleAr || undefined,
      permissions: p.permissions,
      usersCount: p.usersCount,
    }));
  },

  update: async (
    id: string,
    permissions: Array<{ module: string; resource: string; actions: string[] }>
  ): Promise<Role> => {
    const position = await positionsAPI.updatePermissions(id, permissions);
    return {
      id: position.id,
      name: position.title,
      nameAr: position.titleAr || undefined,
      permissions: position.permissions,
      usersCount: position.usersCount,
    };
  },
};

// Permission Groups API (Phase 3 - multi-group)
export interface PermissionGroup {
  id: string;
  name: string;
  nameAr?: string | null;
  description?: string | null;
  isActive: boolean;
  permissions: { id: string; module: string; resource: string; actions: string[] }[];
  _count?: { userRoles: number };
}

export const permissionGroupsAPI = {
  getAll: async (): Promise<PermissionGroup[]> => {
    const response = await api.get('/admin/permission-groups');
    return response.data.data || [];
  },
  create: async (data: { name: string; nameAr?: string; description?: string }) => {
    const response = await api.post('/admin/permission-groups', data);
    return response.data.data;
  },
  update: async (id: string, data: Partial<{ name: string; nameAr: string; description: string; isActive: boolean }>) => {
    const response = await api.put(`/admin/permission-groups/${id}`, data);
    return response.data.data;
  },
  updatePermissions: async (
    id: string,
    permissions: Array<{ module: string; resource: string; actions: string[] }>
  ) => {
    const response = await api.put(`/admin/permission-groups/${id}/permissions`, { permissions });
    return response.data.data;
  },
};

export const userRolesAPI = {
  getAll: async (userId: string) => {
    const response = await api.get(`/admin/users/${userId}/roles`);
    return response.data.data || [];
  },
  assign: async (userId: string, roleId: string) => {
    const response = await api.post(`/admin/users/${userId}/roles`, { roleId });
    return response.data.data;
  },
  remove: async (userId: string, roleId: string) => {
    await api.delete(`/admin/users/${userId}/roles/${roleId}`);
  },
};

// Audit Logs API
export interface AuditLog {
  id: string;
  entityType: string;
  entityId: string;
  action: string;
  userId: string;
  user?: { id: string; username: string; email: string };
  changes?: unknown;
  createdAt: string;
}

export interface AuditLogFilters {
  entityType?: string;
  action?: string;
  userId?: string;
  startDate?: string;
  endDate?: string;
  page?: number;
  pageSize?: number;
}

export const auditLogsAPI = {
  getAll: async (filters?: AuditLogFilters): Promise<PaginatedResponse<AuditLog>> => {
    const params = new URLSearchParams();
    if (filters?.entityType) params.append('entityType', filters.entityType);
    if (filters?.action) params.append('action', filters.action);
    if (filters?.userId) params.append('userId', filters.userId);
    if (filters?.startDate) params.append('startDate', filters.startDate);
    if (filters?.endDate) params.append('endDate', filters.endDate);
    if (filters?.page) params.append('page', String(filters.page));
    if (filters?.pageSize) params.append('pageSize', String(filters.pageSize));

    const response = await api.get(`/admin/audit-logs?${params.toString()}`);
    return {
      success: true,
      data: response.data.data || [],
      pagination: response.data.pagination || { total: 0, page: 1, pageSize: 20, totalPages: 0 },
    };
  },
};

// System Settings API (placeholder - out of scope)
export interface SystemSetting {
  key: string;
  value: unknown;
  description?: string;
}

export const settingsAPI = {
  getAll: async (): Promise<SystemSetting[]> => {
    const response = await api.get('/admin/settings').catch(() => ({ data: { data: [] } }));
    return response.data?.data || [];
  },

  update: async (key: string, value: unknown): Promise<SystemSetting> => {
    const response = await api.put(`/admin/settings/${key}`, { value });
    return response.data.data;
  },
};

// System Health API (placeholder - optional)
export interface SystemHealth {
  status: string;
  database: string;
  memory?: unknown;
  uptime?: number;
}

export const healthAPI = {
  check: async (): Promise<SystemHealth> => {
    const response = await api.get('/admin/health').catch(() => ({ data: { data: {} } }));
    return response.data?.data || response.data || {};
  },
};