/* =============================================================================
 * D03_PlanAnalysis_UI_LayerLegend.ts
 * D03 바탕 겹 받은 자료 꼴 · 범례 줄 · 겹별 수(PLAN 569-2 · 581 · 584-1 · 584-3) — 켠 겹의 받은 범위 안 수 · 넓이.
 *   부르는 곳 = `D03_PlanAnalysis_UI_Layers.ts`(받기 · 그리기).
 * ========================================================================== */

import type { LegendItem } from "@ui/ui_template_flow_legend";
import type { PreparedLayer } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
import type {
  PlanBand,
  PlanForestRoads,
  PlanLandslideZones,
  PlanRaster,
  PlanSoils,
  PlanZones,
} from "./D03_PlanAnalysis_Api";
import {
  LANDSLIDE_LEGEND,
  LINE_KEYS,
  LINE_LAYERS,
  ZONE_COLORS,
  hectare,
  type LineLayerKey,
  type PlanLayerKey,
} from "./D03_PlanAnalysis_UI_LayerDefs";

/** 선 겹 — 그릴 선 · 받은 범위 안 가닥 · 길이 m. */
export interface PreparedLines {
  layer: PreparedLayer;
  count: number;
  length_m: number;
}
export type Prepared = Record<LineLayerKey, PreparedLines> & {
  contour: PreparedLayer;
  /** 세류 · 하천(소하천 · 지방하천 · 연결선). */
  stream: [PreparedLayer, PreparedLayer];
  cadastral: PreparedLayer;
  /** 전체 · 그중 임도 짐작(소로 · 미분류) — `road` · `forestRoad` 가 함께 씀. */
  road: { all: PreparedLayer; small: PreparedLayer };
  /** 올린 임도망도(584-3). */
  forestRoadFile: { layer: PreparedLayer; info: PlanForestRoads };
  slope: { raster: PlanRaster; image: HTMLImageElement };
  hillshade: { raster: PlanRaster; image: HTMLImageElement };
  landslide: { raster: PlanRaster; image: HTMLImageElement };
  /** 산사태취약지역(584-3) — 점(경위도) · 지번 맞는 필지 테두리. */
  landslideZones: { parcels: PreparedLayer; info: PlanLandslideZones };
  water: PreparedLayer;
  zones: { kinds: Map<string, PreparedLayer>; summary: PlanZones["summary"] };
  /** 토양형(코드 차례) → 지물 · 색 값. */
  soils: { kinds: Array<{ layer: PreparedLayer; color: string }>; summary: PlanSoils["summary"] };
  bands: { stream: PreparedLayer; road: PreparedLayer; info: { stream: PlanBand; road: PlanBand } };
  building: PreparedLayer;
  place: Array<{ lon: number; lat: number; name: string }>;
};

const km = (m: number): string => `${(m / 1000).toFixed(2)} km`;

/** 산사태취약지역 범례 — 점 · 필지 · 위치 없는 시도 · 표 없는 시도 · 지적 못 받음. */
function landslideZoneRow({ info }: Prepared["landslideZones"]): LegendItem[] {
  const color = "var(--draw-map-landslide-zone)";
  const items: LegendItem[] = [
    {
      label: `산사태취약지역 점 ${info.points.length}곳`,
      color,
      kind: "dot",
      off: !info.points.length,
    },
    {
      label: `지번 맞는 필지 ${info.parcels.features?.length ?? 0}곳(테두리)`,
      color,
      kind: "dash",
      off: !info.parcels.features?.length,
    },
  ];
  for (const sido of info.sidos)
    if (!sido.located) items.push({ label: `${sido.name} 위치 없음 — 필지만`, color, off: true });
  for (const name of info.missing)
    items.push({ label: `${name} — 이 시도 자료 없음`, color: "transparent", off: true });
  if (!info.cadastral)
    items.push({ label: "지적도 못 받음 — 필지 테두리 없음", color: "transparent", off: true });
  return items;
}

export function legendRows(
  on: Record<PlanLayerKey, boolean>,
  data: Partial<Prepared>,
): LegendItem[][] {
  const rows: LegendItem[][] = [];
  if (on.slope && data.slope)
    rows.push(
      data.slope.raster.bands.map((band) => ({
        label: `${band.min_deg}${band.max_deg < 90 ? `~${band.max_deg}°` : "°↑"} ${(band.ratio * 100).toFixed(1)} %`,
        color: band.color,
      })),
    );
  if (on.landslide && data.landslide) rows.push(LANDSLIDE_LEGEND);
  if (on.landslideZones && data.landslideZones) rows.push(landslideZoneRow(data.landslideZones));
  if (on.zones && data.zones) {
    const items = Object.entries(data.zones.summary)
      .filter(([, kind]) => kind.count || kind.failed)
      .map(([key, kind]) => ({
        label: kind.failed
          ? `${kind.label} 받지 못함`
          : `${kind.label} ${kind.count}곳 ${hectare(kind.area_m2)}`,
        color: `var(${ZONE_COLORS[key]})`,
        off: !!kind.failed,
      }));
    rows.push(
      items.length
        ? items
        : [{ label: "보호 · 규제 구역 없음(받은 범위 안)", color: "transparent", off: true }],
    );
  }
  if (on.soils && data.soils) {
    const { kinds, summary } = data.soils;
    rows.push(
      summary.length
        ? summary.map((soil, i) => ({
            label: `${soil.name} ${hectare(soil.area_m2)}`,
            color: `var(${kinds[i].color})`,
          }))
        : [{ label: "산림입지도 없음(받은 범위 안)", color: "transparent", off: true }],
    );
  }
  if (on.bands && data.bands) {
    const { stream, road } = data.bands.info;
    rows.push([
      {
        label: `계류 ${stream.dist_m} m 띠 ${hectare(stream.area_m2)} (${(stream.ratio * 100).toFixed(1)} %)`,
        color: "var(--draw-map-band-stream)",
      },
      {
        label: `도로 ${road.dist_m} m 띠 ${hectare(road.area_m2)} (${(road.ratio * 100).toFixed(1)} %)`,
        color: "var(--draw-map-band-road)",
      },
    ]);
  }
  const lines = LINE_KEYS.flatMap((key) => {
    const got = on[key] && data[key];
    if (!got) return [];
    const { label, color, dash } = LINE_LAYERS[key];
    return [
      {
        label: `${label} ${got.count}가닥 ${km(got.length_m)}`,
        color: `var(${color})`,
        kind: dash.length ? ("dash" as const) : ("line" as const),
        off: !got.count,
      },
    ];
  });
  if (lines.length) rows.push(lines);
  const tail: LegendItem[] = [];
  if (on.water && data.water)
    tail.push({ label: `물 면 ${data.water.features.length}곳`, color: "var(--draw-map-water)" });
  if (on.building && data.building)
    tail.push({
      label: `건물 ${data.building.features.length.toLocaleString()}동`,
      color: "var(--draw-map-building)",
    });
  if (on.forestRoad && data.road)
    tail.push({
      label: `임도 짐작 ${data.road.small.features.length}가닥`,
      color: "var(--draw-map-forest-road)",
      kind: "dash",
    });
  if (on.forestRoadFile && data.forestRoadFile)
    tail.push({
      label: `올린 임도망도 ${data.forestRoadFile.info.count}가닥 ${km(data.forestRoadFile.info.length_m)}`,
      color: "var(--draw-map-forest-road-file)",
      kind: "line",
    });
  if (tail.length) rows.push(tail);
  return rows;
}

/** 검증 창구 — 겹별 수(지물 · 넓이 m² · 길이 m). */
export const layerCounts = (data: Partial<Prepared>): Record<string, number> => ({
  ...(data.building && { building: data.building.features.length }),
  ...(data.water && { water: data.water.features.length }),
  ...(data.road && {
    road: data.road.all.features.length,
    forestRoad: data.road.small.features.length,
  }),
  ...(data.forestRoadFile && {
    forestRoadFile: data.forestRoadFile.info.count,
    forestRoadFile_m: data.forestRoadFile.info.length_m,
    forestRoadFile_total: data.forestRoadFile.info.total,
  }),
  ...(data.landslideZones && {
    landslideZone_points: data.landslideZones.info.points.length,
    landslideZone_parcels: data.landslideZones.parcels.features.length,
    landslideZone_missing: data.landslideZones.info.missing.length,
  }),
  ...(data.place && { place: data.place.length }),
  ...(data.zones &&
    Object.fromEntries(
      Object.entries(data.zones.summary).flatMap(([kind, value]) => [
        [`zone_${kind}`, value.count],
        [`zone_${kind}_m2`, value.area_m2],
      ]),
    )),
  ...(data.soils &&
    Object.fromEntries(
      data.soils.summary.flatMap((soil) => [
        [`soil_${soil.code}`, soil.count],
        [`soil_${soil.code}_m2`, soil.area_m2],
      ]),
    )),
  ...(data.bands && {
    band_stream_m2: data.bands.info.stream.area_m2,
    band_road_m2: data.bands.info.road.area_m2,
  }),
  ...(data.hillshade && { hillshade_px: data.hillshade.image.naturalWidth }),
  ...(data.landslide && { landslide_px: data.landslide.image.naturalWidth }),
  ...Object.fromEntries(
    LINE_KEYS.flatMap((key) => {
      const got = data[key];
      return got
        ? [
            [key, got.count],
            [`${key}_m`, got.length_m],
          ]
        : [];
    }),
  ),
});