import type { CategoryId, TravelMode } from "./osm-tags.js";

// ─── Cities ──────────────────────────────────────────────────────────────────

export type CityStatus = "pending" | "processing" | "ready" | "error" | "empty";

export interface City {
  slug: string;
  name: string;
  countryCode: string;
  geofabrikUrl: string;
  bbox: [number, number, number, number]; // [minLng, minLat, maxLng, maxLat]
  boundary?: object | null;
  status: CityStatus;
  lastIngested: string | null;
}

// ─── POIs ────────────────────────────────────────────────────────────────────

export interface Poi {
  osmId: string;
  osmType: "N" | "W" | "R";
  category: CategoryId;
  subcategory: string;
  name: string | null;
  lng: number;
  lat: number;
}

// ─── Grid / Heatmap ──────────────────────────────────────────────────────────

export interface GridCell {
  gridX: number;
  gridY: number;
  lng: number;
  lat: number;
  score: number;
  categoryScores: Partial<Record<CategoryId, number>>;
}

export interface HeatmapPayload {
  citySlug: string;
  travelMode: TravelMode;
  thresholdMin: number;
  weights: Record<CategoryId, number>;
  gridSpacingM: number;
  cells: GridCell[];
  generatedAt: string;
}

// ─── Stats ───────────────────────────────────────────────────────────────────

export interface CategoryStats {
  category: CategoryId;
  poiCount: number;
  p10: number;
  p25: number;
  p50: number;
  p75: number;
  p90: number;
  coveragePct: number;
}

export interface CityStats {
  citySlug: string;
  totalPois: number;
  gridPointCount: number;
  categoryStats: CategoryStats[];
}

// ─── Isochrones ──────────────────────────────────────────────────────────────

export interface IsochroneRequest {
  lng: number;
  lat: number;
  travelMode: TravelMode;
  contourMinutes: number[];
}

// ─── Job / Pipeline ──────────────────────────────────────────────────────────

export interface JobProgress {
  stage: string;
  pct: number;
  message: string;
  bytesDownloaded?: number;
  totalBytes?: number;
}

export type JobState =
  | "waiting"
  | "active"
  | "completed"
  | "failed"
  | "delayed"
  | "waiting-children";

export interface JobSummary {
  id: string;
  type: string;
  citySlug: string;
  state: JobState;
  progress: JobProgress | null;
  failedReason: string | null;
  createdAt: number;
  finishedAt: number | null;
  duration: number | null;
}

// ─── SSE Events ──────────────────────────────────────────────────────────────

export type RoutingDetail = Record<string, { done: number; total: number }>;

export type SSEEvent =
  | { type: "progress"; stage: string; pct: number; message: string; bytesDownloaded?: number; totalBytes?: number; routingDetail?: RoutingDetail }
  | { type: "completed"; jobId: string }
  | { type: "failed"; jobId: string; error: string }
  | { type: "heartbeat" };

// ─── Geofabrik ───────────────────────────────────────────────────────────────

export interface GeofabrikFeature {
  type: "Feature";
  properties: {
    id: string;
    parent?: string;
    name: string;
    urls: {
      pbf: string;
      "pbf.md5": string;
    };
    poly?: string;
  };
  geometry: GeoJSON.Polygon | GeoJSON.MultiPolygon | null;
}

export interface GeofabrikIndex {
  type: "FeatureCollection";
  features: GeofabrikFeature[];
}

// ─── API helpers ─────────────────────────────────────────────────────────────

export interface ApiError {
  error: string;
  code: string;
}