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

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

export interface ValuationRequest {
  propertyType: string;
  area: number;
  district: string;
  city: string;
  bedrooms?: number;
  bathrooms?: number;
  floors?: number;
  frontage?: number;
  roadWidth?: number;
  yearBuilt?: number;
  hasLegalPaper?: boolean;
  latitude?: number;
  longitude?: number;
  /** Optional project ID for project-based valuation */
  projectId?: string;
  /** Image file for visual analysis */
  imageUrl?: string;
  /** Description text for AI context */
  description?: string;
  /** Request deep analysis (confidence explanation, more drivers) */
  deepAnalysis?: boolean;
}

export interface ValuationComparable {
  id: string;
  title: string;
  address: string;
  district: string;
  priceVND: string;
  areaM2: number;
  pricePerM2: number;
  similarity: number;
  propertyType?: string;
  bedrooms?: number;
  bathrooms?: number;
  floors?: number;
  yearBuilt?: number;
  latitude?: number;
  longitude?: number;
}

export interface PriceDriver {
  feature: string;
  impact: number;
  direction: 'positive' | 'negative';
  /** Human-readable explanation of this driver's impact */
  explanation?: string;
}

export interface MarketContext {
  avgPricePerM2: number;
  medianPrice: number;
  priceGrowthYoY: number;
  demandIndex: number;
  supplyCount: number;
  avgDaysOnMarket: number;
  district: string;
  city: string;
  period: string;
}

export interface ValuationHistoryPoint {
  date: string;
  estimatedPriceVND: number;
  confidence: number;
}

export interface ConfidenceExplanation {
  level: 'high' | 'medium' | 'low';
  score: number;
  factors: Array<{
    factor: string;
    contribution: 'positive' | 'negative';
    detail: string;
  }>;
  summary: string;
}

export interface ValuationResult {
  id: string;
  estimatedPriceVND: number;
  confidence: number;
  pricePerM2: number;
  priceRangeLow: number;
  priceRangeHigh: number;
  comparables: ValuationComparable[];
  priceDrivers: PriceDriver[];
  modelVersion: string;
  createdAt: string;
  /** Enhanced fields from deep analysis */
  confidenceExplanation?: ConfidenceExplanation;
  marketContext?: MarketContext;
  valuationHistory?: ValuationHistoryPoint[];
}

export interface ValuationHistoryItem {
  id: string;
  propertyType: string;
  district: string;
  city: string;
  area: number;
  estimatedPriceVND: number;
  confidence: number;
  createdAt: string;
}

export interface ValuationHistoryResponse {
  data: ValuationHistoryItem[];
  total: number;
  page: number;
  limit: number;
}

export interface BatchValuationRequest {
  properties: ValuationRequest[];
}

export interface BatchValuationResponse {
  results: ValuationResult[];
  totalProcessed: number;
  errors: Array<{ index: number; message: string }>;
}

export interface ValuationCompareRequest {
  propertyIds: string[];
}

export interface ValuationCompareResponse {
  properties: Array<{
    id: string;
    valuation: ValuationResult;
    property: {
      title: string;
      district: string;
      city: string;
      area: number;
      propertyType: string;
    };
  }>;
}

export interface ProjectSuggestion {
  id: string;
  name: string;
  district: string;
  city: string;
  type: string;
}

// ─── API ────────────────────────────────────────────────

export const valuationApi = {
  /** Request AVM estimate via POST /analytics/valuation */
  predict: (data: ValuationRequest) => {
    // Build request body with all fields
    const body: Record<string, unknown> = {
      propertyType: data.propertyType,
      areaM2: data.area,
      district: data.district,
      city: data.city,
    };

    if (data.bedrooms != null) body['bedrooms'] = data.bedrooms;
    if (data.bathrooms != null) body['bathrooms'] = data.bathrooms;
    if (data.floors != null) body['floors'] = data.floors;
    if (data.frontage != null) body['frontage'] = data.frontage;
    if (data.roadWidth != null) body['roadWidth'] = data.roadWidth;
    if (data.yearBuilt != null) body['yearBuilt'] = data.yearBuilt;
    if (data.hasLegalPaper != null) body['hasLegalPaper'] = data.hasLegalPaper;
    if (data.latitude) body['latitude'] = data.latitude;
    if (data.longitude) body['longitude'] = data.longitude;
    if (data.projectId) body['projectId'] = data.projectId;
    if (data.imageUrl) body['imageUrl'] = data.imageUrl;
    if (data.description) body['description'] = data.description;
    if (data.deepAnalysis) body['deepAnalysis'] = data.deepAnalysis;

    return apiClient.post<ValuationResult>('/analytics/valuation', body);
  },

  /** Batch valuation: POST /analytics/valuation/batch (max 50) */
  batchPredict: (data: BatchValuationRequest) =>
    apiClient.post<BatchValuationResponse>('/analytics/valuation/batch', data),

  /** Get valuation history for a property: GET /analytics/valuation/history/:propertyId */
  getPropertyHistory: (propertyId: string) =>
    apiClient.get<{ data: ValuationHistoryPoint[] }>(
      `/analytics/valuation/history/${propertyId}`,
    ),

  /** Compare valuations: POST /analytics/valuation/compare */
  compare: (data: ValuationCompareRequest) =>
    apiClient.post<ValuationCompareResponse>('/analytics/valuation/compare', data),

  /** User valuation history (paginated) */
  getHistory: (page = 1, limit = 10) =>
    apiClient.get<ValuationHistoryResponse>(
      `/analytics/valuation/user-history?page=${page}&limit=${limit}`,
    ),

  /** Get single valuation by ID */
  getById: (id: string) =>
    apiClient.get<ValuationResult>(`/analytics/valuation/${id}`),

  /** Predict for existing listing */
  predictForListing: (listingId: string) =>
    apiClient.post<ValuationResult>('/analytics/valuation', {
      propertyId: listingId,
    }),

  /** Search projects for autocomplete */
  searchProjects: (query: string) =>
    apiClient.get<{ data: ProjectSuggestion[] }>(
      `/projects/search?q=${encodeURIComponent(query)}&limit=10`,
    ),
};