home-automation/frontend/src/map/mapUtils.ts

/**
 * Pure data-transform utilities for the map view (M2-T09).
 * No leaflet imports — these functions are unit-testable in jsdom.
 */

import type { LocationRecord, PooRecord } from '../records'

/** A heat point for L.heatLayer: [lat, lng, intensity]. */
export type HeatPoint = [number, number, number]

/** Map point with attached source record for click-to-edit. */
export interface LocationMapPoint {
  lat: number
  lng: number
  record: LocationRecord
}

export interface PooMapPoint {
  lat: number
  lng: number
  record: PooRecord
}

// ---------------------------------------------------------------------------
// Transforms
// ---------------------------------------------------------------------------

/**
 * Convert location records to heat points.
 * All points get intensity=1; callers can adjust if needed.
 */
export function locationsToHeatPoints(records: LocationRecord[]): HeatPoint[] {
  return records.map((r) => [r.latitude, r.longitude, 1])
}

/**
 * Convert poo records to heat points.
 */
export function pooToHeatPoints(records: PooRecord[]): HeatPoint[] {
  return records.map((r) => [r.latitude, r.longitude, 1])
}

/**
 * Convert location records to map points (for scatter layer).
 */
export function locationsToMapPoints(records: LocationRecord[]): LocationMapPoint[] {
  return records.map((r) => ({ lat: r.latitude, lng: r.longitude, record: r }))
}

/**
 * Convert poo records to map points (for scatter layer).
 */
export function pooToMapPoints(records: PooRecord[]): PooMapPoint[] {
  return records.map((r) => ({ lat: r.latitude, lng: r.longitude, record: r }))
}

// ---------------------------------------------------------------------------
// Client-side time-window filter (for poo records — the endpoint has no server filter)
// ---------------------------------------------------------------------------

/**
 * Filter poo records to those whose timestamp falls within [start, end] (inclusive).
 * start and end are ISO8601 strings (e.g. "2026-01-01T00:00:00Z").
 * If start or end is null, that bound is open (no filtering on that side).
 */
export function filterPooByTimeWindow(
  records: PooRecord[],
  start: string | null,
  end: string | null,
): PooRecord[] {
  if (!start && !end) return records
  return records.filter((r) => {
    const ts = r.timestamp
    if (start && ts < start) return false
    if (end && ts > end) return false
    return true
  })
}

// ---------------------------------------------------------------------------
// Default time window helpers
// ---------------------------------------------------------------------------

/** Returns ISO8601 string for N days ago from now (UTC). */
export function daysAgoISO(days: number): string {
  const d = new Date()
  d.setUTCDate(d.getUTCDate() - days)
  return d.toISOString()
}

/** Returns ISO8601 string for now (UTC). */
export function nowISO(): string {
  return new Date().toISOString()
}

/** Compute a bounding center from an array of lat/lng points. Returns null if empty. */
export function computeCenter(
  points: Array<{ lat: number; lng: number }>,
): [number, number] | null {
  if (points.length === 0) return null
  const sumLat = points.reduce((s, p) => s + p.lat, 0)
  const sumLng = points.reduce((s, p) => s + p.lng, 0)
  return [sumLat / points.length, sumLng / points.length]
}