export type Lang = 'pl' | 'en';

export type ProfileKind = 'wheelchair' | 'stroller';

/** Preferences only — never a diagnosis. Stored on the device. */
export interface Profile {
  kind: ProfileKind;
  /** Highest kerb the user can cross, cm. */
  maxKerbCm: number;
  /** Narrowest passage, metres. */
  minWidthM: number;
  /** Steepest slope, percent. */
  maxInclinePct: number;
  avoidCobbles: boolean;
  needToilet: boolean;
  needRest: boolean;
  needChanging: boolean;
}

export type PlaceCategory = 'food' | 'culture' | 'shop' | 'stay' | 'health' | 'services' | 'toilets' | 'elevator' | 'transit';

export interface Place {
  id: string;
  lat: number;
  lon: number;
  name: string | null;
  cat: PlaceCategory;
  kind: string | null;
  /** ISO date of the last edit of the OSM element (not necessarily of the access tags). */
  ts: string | null;
  tags: Record<string, string>;
  /** Fictional place that exists only to demonstrate data states. */
  demo?: boolean;
  /** City-feed extras (GTFS stops). */
  ext?: { gtfsWheelchair: number | null; feedDate: string | null; mode: 'tram' | 'bus'; osmMatch: string | null };
}

export interface Way {
  id: number;
  hw: string;
  ts: string | null;
  nodes: number[];
  name?: string;
  surface?: string;
  smooth?: string;
  incline?: string;
  width?: string;
  stepCount?: number;
  ramp?: string;
  rampWheelchair?: string;
  rampStroller?: string;
  handrail?: string;
  footway?: 'crossing' | 'sidewalk';
  tunnel?: boolean;
  bridge?: boolean;
  wheelchair?: string;
  checked?: string;
}

export interface Snapshot {
  meta: {
    fetchedAt: string;
    bbox: [number, number, number, number];
    source: string;
    license: string;
    endpoint: string;
    cityData: { name: string; url: string; feedDates: { mode: string; version: string | null }[]; license: string };
    counts: Record<string, number>;
  };
  places: Place[];
  toilets: Place[];
  elevators: Place[];
  /** [lat, lon, ISO date | null] */
  benches: [number, number, string | null][];
  nodes: [number, number][];
  ways: Way[];
  kerbs: Record<string, string>;
}

// ---------------- assessment ----------------

export type Status = 'ok' | 'warn' | 'fail' | 'unknown' | 'conflict';

/**
 * How far a piece of information can be trusted. Ordered strongest first.
 * - verified: dated survey (check_date / survey:date) within 24 months
 * - mapped: present in OSM, edited within 24 months, no survey date
 * - stale: present in OSM but not touched for over 24 months
 * - inferred: derived from nearby geometry, not stated for this place
 * - user: unverified report from a user of this app
 * - none: nothing is known
 */
export type Confidence = 'verified' | 'mapped' | 'stale' | 'inferred' | 'user' | 'none';

export type SourceKind = 'osm-tag' | 'osm-geometry' | 'user-report' | 'city-review' | 'city-gtfs' | 'demo' | 'none';

export type FactKey = 'entrance' | 'steps' | 'ramp' | 'width' | 'surface' | 'toilet' | 'rest' | 'changing';

/** Translatable message: key into the i18n dictionary plus parameters. */
export interface Msg {
  k: string;
  p?: Record<string, string | number>;
}

export interface Fact {
  key: FactKey;
  status: Status;
  headline: Msg;
  detail?: Msg;
  source: SourceKind;
  confidence: Confidence;
  /** ISO date this information dates from, when known. */
  date: string | null;
  /** Required for this profile, i.e. it can decide the verdict. */
  required: boolean;
  /** Second opinion that disagrees (user report vs OSM). */
  alt?: { headline: Msg; source: SourceKind; confidence: Confidence; date: string | null };
}

export type Verdict = 'match' | 'partial' | 'fail' | 'incomplete' | 'conflict';

export interface Assessment {
  placeId: string;
  verdict: Verdict;
  facts: Fact[];
}

export type ReportAttr = 'entrance' | 'steps' | 'width' | 'toilet' | 'ramp';

export type MeasureMethod = 'photo-ref' | 'inclinometer' | 'manual' | 'lidar';

/** A number measured on site. `lidar` is reserved for a future native iOS companion app. */
export interface Measurement {
  kind: 'kerb' | 'incline';
  value: number;
  unit: 'cm' | 'pct';
  method: MeasureMethod;
}
export type ReportValue = 'yes' | 'limited' | 'no' | number;

export interface UserReport {
  id: string;
  placeId: string;
  attr: ReportAttr;
  /** yes/limited/no, or entrance width in cm. */
  value: ReportValue;
  note?: string;
  createdAt: string;
  /** Who wrote it (demo account id). */
  authorId?: string;
  /** City moderation outcome; absent = pending. */
  status?: 'pending' | 'accepted' | 'rejected';
  reviewedAt?: string;
  reviewedBy?: string;
  /** Seeded example, not a real user report. */
  demo?: boolean;
  /** Photo stored in IndexedDB under this id (EXIF stripped, downscaled). */
  photoId?: string;
  /** Measured on site, if any. */
  measure?: Measurement;
  /** Automated first look; a human always decides. */
  vetting?: VetState;
}

// ---------------- AI triage ----------------

export type EvidenceFlag = 'blurry' | 'face' | 'text' | 'unrelated' | 'no-photo';

export interface Vetting {
  provider: string;
  at: string;
  validity: 'valid' | 'unclear' | 'invalid';
  /** Does the photo agree with what the reporter claims? */
  consistency: 'supports' | 'contradicts' | 'neutral';
  severity: 'critical' | 'major' | 'minor' | 'none';
  accessibilityClass: 'inaccessible' | 'difficult' | 'accessible' | 'unknown';
  triage: 'fast-track' | 'review' | 'likely-reject';
  confidence: number;
  flags: EvidenceFlag[];
  /** Top photo labels with probabilities (0..1). */
  top: { key: string; score: number }[];
  reasons: Msg[];
}

export type VetState =
  | { state: 'running' }
  | { state: 'done'; result: Vetting }
  | { state: 'failed'; reason: 'no-credits' | 'error' };