import { apiClient } from './api-client';

// ─── Types ──────────────────────────────────────────────

export type LeadStatus = 'NEW' | 'CONTACTED' | 'QUALIFIED' | 'NEGOTIATING' | 'CONVERTED' | 'LOST';

export interface LeadReadDto {
  id: string;
  agentId: string;
  name: string;
  phone: string;
  email: string | null;
  source: string;
  score: number | null;
  notes: Record<string, unknown> | null;
  status: LeadStatus;
  createdAt: string;
  updatedAt: string;
}

export interface LeadStatsData {
  totalLeads: number;
  byStatus: Record<string, number>;
  conversionRate: number;
  avgScore: number | null;
}

export interface PaginatedResult<T> {
  data: T[];
  total: number;
  page: number;
  limit: number;
  totalPages: number;
}

export interface ListLeadsParams {
  status?: LeadStatus;
  page?: number;
  limit?: number;
}

export interface CreateLeadPayload {
  name: string;
  phone: string;
  email?: string;
  source: string;
  score?: number;
  notes?: Record<string, unknown>;
}

// ─── Constants ──────────────────────────────────────────

export const LEAD_STATUSES: Record<LeadStatus, { label: string; variant: 'default' | 'secondary' | 'destructive' | 'outline' | 'success' | 'warning' | 'info' }> = {
  NEW: { label: 'Mới', variant: 'info' },
  CONTACTED: { label: 'Đã liên hệ', variant: 'secondary' },
  QUALIFIED: { label: 'Đủ điều kiện', variant: 'warning' },
  NEGOTIATING: { label: 'Đang thương lượng', variant: 'default' },
  CONVERTED: { label: 'Chuyển đổi', variant: 'success' },
  LOST: { label: 'Mất', variant: 'destructive' },
};

export const LEAD_SOURCES = [
  { value: 'website', label: 'Website' },
  { value: 'referral', label: 'Giới thiệu' },
  { value: 'social', label: 'Mạng xã hội' },
  { value: 'phone', label: 'Điện thoại' },
  { value: 'walk_in', label: 'Đến trực tiếp' },
  { value: 'other', label: 'Khác' },
] as const;

// ─── API Functions ──────────────────────────────────────

export const leadsApi = {
  /** Create a new lead */
  create: (data: CreateLeadPayload) =>
    apiClient.post<{ leadId: string }>('/leads', data),

  /** List leads for current agent */
  getLeads: (params: ListLeadsParams = {}) => {
    const query = new URLSearchParams();
    if (params.status) query.append('status', params.status);
    if (params.page) query.append('page', String(params.page));
    if (params.limit) query.append('limit', String(params.limit));
    const qs = query.toString();
    return apiClient.get<PaginatedResult<LeadReadDto>>(
      `/leads${qs ? `?${qs}` : ''}`,
    );
  },

  /** Get lead statistics */
  getStats: () => apiClient.get<LeadStatsData>('/leads/stats'),

  /** Update lead status */
  updateStatus: (id: string, status: LeadStatus) =>
    apiClient.patch<{ updated: boolean }>(`/leads/${id}/status`, { status }),

  /** Delete a lead */
  delete: (id: string) =>
    apiClient.delete<{ deleted: boolean }>(`/leads/${id}`),
};