/* =============================================================================
 * B05_Profile_UI_RouteEdit_Layers.ts
 * 평면 노선 편집 지도 겹(PLAN 624-3 · 요구 530 · 결정 A② · A③ · A⑦ · A⑨) — 공용 겹 줄 · 범례(`A00_Common/map`)를 B05 평면에.
 *   겹 목록 · 처음 켬 · 취향 = 공용 표(634-2 · 22 겹 모두 · 처음 = 등고선 · 하천만) · 임도(업로드) = 받은 자료 없으면 막힘 + 까닭.
 *   등고선 · 하천 = B05 자기 자료(LAS 5 m · 1 m · 도엽 · 집기 · 자물쇠 그대로 · `_Gl` 이 그림 · 노선 띠 300 m 자르기는 이 둘만) ·
 *     켬끔은 GL 에서만(옛 캔버스 = 늘 보임).
 *   그 밖 겹 = GL 만(A⑦) · 띠로 안 자르는 둘째 GL 칸(맨 밑 · 켠 겹이 있을 때만 섬) · 꼴 = 공용 `mapLayerSpecs` ·
 *     카메라 = `_Gl` 과 같은 화면 따라가기(`glCameraOf`).
 *   받기 = 켤 때 한 번(서버 `/plan/…` · 624-1 임도 프로젝트 · 지형 = 설계 지형) · 도엽 선 겹 = 프로젝트 범위 도엽 조각 ·
 *     실패 = 그 겹만 끔 + 알림 · 범례 = 켠 겹의 받은 자료 줄(공용 `legendRows`) · 급경사 ⚙ · 위성 밝기.
 *   부르는 곳 = `_Chrome`(겹 줄 · 범례 자리) · `_Gl`(따라가기 · 켬끔).
 * ========================================================================== */

import { showToast } from "@ui/ui_template_elements";
import { createGlMap, GL_FONT, satelliteTileSource, type GlData } from "@ui/ui_template_gl_map";
import { themeColor } from "@ui/ui_template_palette";
import type { VWorldMeta } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
import type { Normalizer } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
import { glCameraOf } from "../B04_PreProcess/logic/B04_PreProcess_UI_MapGl_Frame";
import { forestSources, soilColor, tileOnly } from "../A00_Common/map/map_forest_layers";
import {
  fetchPlanBands,
  fetchPlanCadastral,
  fetchPlanLandslideZones,
  fetchPlanLines,
  fetchPlanRaster,
  fetchPlanSheetTile,
  fetchPlanSheetTiles,
  fetchPlanSoils,
  fetchPlanZeroOrder,
  fetchPlanZones,
  type GeoJsonCollection,
} from "../A00_Common/map/map_layer_api";
import { createMapLayerBar } from "../A00_Common/map/map_layer_bar";
import {
  FOREST_ROAD_KINDS,
  WATER_KEYS,
  bandCollection,
  glImage,
  glTagged,
  loadImage,
  shadeImage,
} from "../A00_Common/map/map_layer_data";
import {
  LAYERS,
  LINE_LAYERS,
  ZONE_COLORS,
  type MapLayerKey,
} from "../A00_Common/map/map_layer_list";
import { createMapLegend, legendRows, type LegendData } from "../A00_Common/map/map_legend";
import { MAP_THEME_NAMES, mapLayerSpecs } from "../A00_Common/map/map_layer_specs";
import { createSatLightRow, readSatLight } from "../A00_Common/map/map_sat_light";
import {
  openSlopeBands,
  paintSlope,
  readSlopeBands,
  slopeGear,
  slopeValues,
  writeSlopeBands,
} from "../A00_Common/map/map_slope_bands";

/** B05 자기 자료로 그리는 겹(`_Gl` · 띠 자르기). */
const OWN: readonly MapLayerKey[] = ["contour", "stream"];
const isOwn = (key: MapLayerKey): boolean => OWN.includes(key);
/** 겹 → 도엽 조각 이름(서버 `TILE_NAMES` · D03 `SHEET_TILE_NAMES` 와 같음). */
const SHEET_NAMES: Partial<Record<MapLayerKey, string[]>> = {
  water: WATER_KEYS,
  road: ["도로중심선"],
  forestRoad: ["도로중심선"],
  building: ["건물"],
  place: ["지명"],
};
/** 겹 → 받는 자료 칸(임도 짐작 = 도로 · 도로 300 m 띠 = 띠 자료 · 634-3). */
const slotOf = (key: MapLayerKey): MapLayerKey =>
  key === "forestRoad" ? "road" : key === "roadBands" ? "bands" : key;
/** 도엽이 이보다 많으면 선 겹 숨김(D03 `FULL_MAX` 와 같음). */
const SHEET_MAX = 12;
/** 지도 칸 둘레 여유(px · `.ui-gl-map` inset · B04 `createTmGl` 과 같음). */
const GL_MARGIN_PX = 8;

export interface RouteEditLayers {
  /** 겹 줄(도구줄 아래 줄). */
  bar: HTMLElement;
  /** 켠 겹 범례(상태 글판 안). */
  legend: HTMLElement;
  /** B05 자기 겹 켬끔 — 등고선 · 하천을 그리나(옛 캔버스 = 늘 참). */
  own: () => { contour: boolean; stream: boolean };
  /** GL 켬끔 · 지도 범위가 바뀜 — 단추 · 범례 맞춤. */
  sync: (glOn: boolean, meta: VWorldMeta | null) => void;
  /** 그리기마다(GL 켬일 때만) — 켠 겹이 있으면 둘째 칸을 세우고 화면을 따라감. */
  follow: (
    meta: VWorldMeta,
    normalizer: Normalizer,
    toScreen: (nx: number, ny: number) => [number, number],
    width: number,
    height: number,
  ) => void;
  /** GL 끔 · 떠남 — 둘째 칸 버림. */
  park: () => void;
  /** 검증 창구 — 켬끔 · 받은 겹 · 둘째 칸 · 겹마다 그린 지물 수. */
  state: () => {
    on: Record<MapLayerKey, boolean>;
    loaded: MapLayerKey[];
    map: boolean;
    gl: Record<string, number>;
    sheets: number;
  };
}

export function createRouteEditLayers(opts: {
  projectId: string;
  /** 지도 칸(둘째 GL 칸을 맨 앞에 둠). */
  wrap: HTMLElement;
  /** 그래픽 카드 단추 — `_Gl` 켬끔. */
  onGl: () => void;
  /** 장면 다시 그리기. */
  redraw: () => void;
}): RouteEditLayers {
  const { projectId, wrap } = opts;
  let glOn = false;
  let meta: VWorldMeta | null = null;
  let light = readSatLight();
  const gl = createGlMap<MapLayerKey>({
    specs: () => mapLayerSpecs(light, null),
    fixed: { satellite: satelliteTileSource(projectId), ...forestSources(projectId) },
    themeNames: MAP_THEME_NAMES,
    onFail: (why) => showToast(`지도 겹을 그래픽 카드로 못 그림 — ${why}`, "info"),
  });
  const layerBar = createMapLayerBar({
    page: "b05",
    glOn,
    onToggle: (key) => {
      void ensure(key);
      sync(glOn, meta);
      opts.redraw();
    },
    onGl: opts.onGl,
  });
  const { on } = layerBar;
  layerBar.root.classList.add("b05-routeedit__layers");
  const legendBox = createMapLegend("b05-routeedit__maplegend");
  const data: Partial<LegendData> = {};
  const loaded = new Set<MapLayerKey>();
  const pending = new Map<string, Promise<void>>();
  let hillshade: { plain: GlData; shade: GlData } | null = null;
  let size = "";
  let enabled = false;

  /** 급경사 범위(603 · D03 과 같은 취향) — 바꾸면 다시 칠함. */
  let slopeBands = readSlopeBands();
  let slopeValuesNow: ImageData | null = null;
  const gear = slopeGear(() =>
    openSlopeBands(slopeBands, (bands) => {
      slopeBands = bands;
      writeSlopeBands(bands);
      void paintSlopeNow();
    }),
  );
  async function paintSlopeNow(): Promise<void> {
    const got = data.slope;
    if (!got || !slopeValuesNow) return;
    const bands = slopeBands;
    const painted = await paintSlope(slopeValuesNow, bands);
    if (bands !== slopeBands) return URL.revokeObjectURL(painted.url);
    data.slope = { raster: got.raster, bands };
    gl.setData("slope", glImage(got.raster, painted.url));
    sync(glOn, meta);
    opts.redraw();
  }
  const lightRow = createSatLightRow(light, (level) => {
    light = level;
    if (gl.map()?.getLayer("satellite"))
      gl.map()!.setPaintProperty("satellite", "raster-brightness-max", level);
    opts.redraw();
  });

  function sync(nextGl: boolean, nextMeta: VWorldMeta | null): void {
    const first = !meta && nextMeta;
    glOn = nextGl;
    meta = nextMeta;
    // 막힘 까닭(634-3 · 공용 sync 가 단추 · 메뉴 줄에 「제목 — 까닭」) — 자기 겹(등고선 · 하천) = GL 에서만 켬끔 ·
    // 옛 캔버스는 늘 그림 · 그 밖 겹 = GL 만(A⑦) · 임도(업로드) = 받은 자료 없음(546 공유 일감 전)
    const why: Partial<Record<MapLayerKey, string>> = { forestRoadFile: "받은 임도 자료 없음" };
    for (const def of LAYERS) {
      if (!isOwn(def.key)) gl.setVisible(def.key, on[def.key]);
      if (glOn || why[def.key]) continue;
      if (isOwn(def.key)) why[def.key] = "옛 그림(그래픽 카드 끔)엔 늘 보임";
      else if (meta) why[def.key] = "옛 그림(그래픽 카드 끔)엔 안 보임";
    }
    layerBar.sync({ ready: !!meta, glOn, why });
    if (hillshade) gl.setData("hillshade", on.satellite ? hillshade.shade : hillshade.plain);
    const shown = glOn ? on : ({} as Record<MapLayerKey, boolean>);
    legendBox.show(meta ? legendRows(shown, data) : [], glOn && on.satellite ? [lightRow] : []);
    if (glOn && on.slope && data.slope) legendBox.root.firstElementChild?.append(gear);
    if (first) void Promise.all(LAYERS.map((def) => ensure(def.key)));
  }

  /** 켠 겹 자료 한 번 — 실패 = 그 겹만 끔 + 알림(취향은 안 바꿈). */
  function ensure(key: MapLayerKey): Promise<void> {
    if (!meta || !on[key] || isOwn(key) || tileOnly(key) || key === "landslide") return done();
    if (loaded.has(key)) return done();
    const slot = slotOf(key);
    if (loaded.has(slot as MapLayerKey)) return done();
    const running = pending.get(slot);
    if (running) return running;
    const at = meta;
    const job = fill(key, at)
      .then(() => {
        loaded.add(key);
        loaded.add(slot as MapLayerKey);
        sync(glOn, meta);
        opts.redraw();
      })
      .catch((error: unknown) => {
        for (const def of LAYERS)
          if (def.key === key || slotOf(def.key) === slot) on[def.key] = false;
        sync(glOn, meta);
        opts.redraw();
        const text = error instanceof Error ? error.message : String(error);
        showToast(`${LAYERS.find((def) => def.key === key)!.title} 받지 못함 — ${text}`, "error");
      })
      .finally(() => pending.delete(slot));
    pending.set(slot, job);
    return job;
  }
  const done = (): Promise<void> => Promise.resolve();

  /** 프로젝트 범위 도엽 — 한 번 셈 · 조각은 이름마다 한 번. */
  let sheetList: Promise<string[]> | null = null;
  const sheetCache = new Map<string, Promise<GeoJsonCollection>>();
  async function sheetCollection(names: string[], at: VWorldMeta): Promise<GeoJsonCollection> {
    sheetList ??= fetchPlanSheetTiles(projectId, [
      at.lon_min,
      at.lat_min,
      at.lon_max,
      at.lat_max,
    ]).then((got) => {
      if (got.count > SHEET_MAX) throw new Error(`도엽 ${got.count}장 — 넓어서 선 겹 숨김`);
      return got.sheets;
    });
    const sheets = await sheetList.catch((error: unknown) => {
      sheetList = null;
      throw error;
    });
    const parts = await Promise.all(
      sheets.flatMap((sheet) =>
        names.map((name) => {
          const key = `${sheet}/${name}`;
          if (!sheetCache.has(key))
            sheetCache.set(
              key,
              fetchPlanSheetTile(projectId, sheet, name).catch(() => ({ features: [] })),
            );
          return sheetCache.get(key)!;
        }),
      ),
    );
    return { features: parts.flatMap((part) => part.features ?? []) };
  }

  async function fill(key: MapLayerKey, at: VWorldMeta): Promise<void> {
    const names = SHEET_NAMES[key];
    if (names) {
      const collection = await sheetCollection(names, at);
      if (key === "road" || key === "forestRoad") {
        const small = (collection.features ?? []).filter((feature) =>
          FOREST_ROAD_KINDS.has(String(feature.properties?.["도로구분"])),
        );
        data.road = { small: { features: small } };
        return gl.setData("road", collection);
      }
      if (key === "water") data.water = collection;
      if (key === "building") data.building = collection;
      if (key !== "place") return gl.setData(key, collection);
      const places = (collection.features ?? []).flatMap((feature) => {
        const name = feature.properties?.["명칭"];
        return feature.geometry?.type === "Point" && typeof name === "string" && name
          ? [{ type: "Feature", properties: { name }, geometry: feature.geometry }]
          : [];
      });
      await document.fonts
        .load(`600 24px "${GL_FONT}"`, places.map((p) => p.properties.name).join("") || "가")
        .catch(() => null);
      return gl.setData("place", { features: places });
    }
    if (key === "bands" || key === "roadBands") {
      // 계류 100 m · 도로 300 m 띠(634-3 · D03 과 같은 서버 길 · 자료 한 벌 · 겹 둘)
      const info = await fetchPlanBands(projectId);
      data.bands = { info };
      return gl.setData("bands", bandCollection(info));
    }
    if (key === "hillshade") {
      const raster = await fetchPlanRaster(projectId, "hillshade");
      const image = await loadImage(raster.image);
      const plain = glImage(raster);
      if (plain) hillshade = { plain, shade: glImage(raster, shadeImage(image))! };
      return;
    }
    if (key === "slope") {
      const raster = await fetchPlanRaster(projectId, "slope");
      slopeValuesNow = slopeValues(await loadImage(raster.image));
      data.slope = { raster, bands: slopeBands };
      return paintSlopeNow();
    }
    if (key === "cadastral") return gl.setData("cadastral", await fetchPlanCadastral(projectId));
    if (key === "zones") {
      const zones = await fetchPlanZones(projectId);
      data.zones = { summary: zones.summary };
      return gl.setData(
        "zones",
        glTagged(zones, (props) =>
          themeColor(ZONE_COLORS[String(props["kind"])] ?? "--draw-warning", "#eab308"),
        ),
      );
    }
    if (key === "soils") {
      // 그림 = 조각(622-2) · 범례 = 받은 범위 요약
      const soils = await fetchPlanSoils(projectId);
      data.soils = {
        kinds: soils.summary.map((soil) => ({ color: soilColor(soil.code) })),
        summary: soils.summary,
      };
      return;
    }
    if (key === "landslideZones") {
      const info = await fetchPlanLandslideZones(projectId);
      data.landslideZones = { info };
      return gl.setData("landslideZones", {
        features: [
          ...(info.parcels.features ?? []),
          ...info.points.map((point) => ({
            type: "Feature",
            properties: {},
            geometry: { type: "Point", coordinates: [point.lon, point.lat] },
          })),
        ],
      });
    }
    if (key === "faults" || key === "lineaments" || key === "zeroOrder") {
      const kind = LINE_LAYERS[key].kind;
      const slow = window.setTimeout(
        () => showToast(`${LINE_LAYERS[key].label} 셈 중 — 처음 한 번만`, "info"),
        600,
      );
      try {
        const found = kind
          ? await fetchPlanLines(projectId, kind).then((lines) => ({
              collection: lines as GeoJsonCollection,
              ...lines.summary,
            }))
          : await fetchPlanZeroOrder(projectId);
        data[key] = { count: found.count, length_m: found.length_m };
        return gl.setData(key, found.collection);
      } finally {
        window.clearTimeout(slow);
      }
    }
  }

  const wanted = (): boolean => glOn && LAYERS.some((def) => !isOwn(def.key) && on[def.key]);

  function park(): void {
    if (!enabled) return;
    enabled = false;
    gl.enable(null);
  }

  return {
    bar: layerBar.root,
    legend: legendBox.root,
    own: () => ({ contour: !glOn || on.contour, stream: !glOn || on.stream }),
    sync,
    follow(at, normalizer, toScreen, width, height) {
      if (!wanted() || width <= 0 || height <= 0) return park();
      if (!enabled) {
        enabled = gl.enable(wrap);
        size = "";
        if (!enabled) return;
      }
      const container = gl.container();
      if (!container) return;
      // 맨 밑(띠로 자른 B05 칸 아래) — 그 칸을 다시 켜면 앞에 붙으므로 그릴 때마다 맞춤
      if (wrap.firstElementChild !== container) wrap.prepend(container);
      const now = `${width}x${height}`;
      if (now !== size) {
        size = now;
        container.style.width = `${width + 2 * GL_MARGIN_PX}px`;
        container.style.height = `${height + 2 * GL_MARGIN_PX}px`;
        gl.resize();
      }
      const camera = glCameraOf(at, normalizer, toScreen, width, height);
      if (!camera) return;
      gl.camera(camera.center, camera.zoom, camera.bearing);
      container.style.transform = `matrix(${camera.css.join(", ")}, 0, 0)`;
    },
    park,
    state: () => ({
      on: { ...on },
      loaded: [...loaded],
      map: enabled,
      gl: Object.fromEntries(
        (gl.map()?.getStyle().layers ?? [])
          .filter((layer) => layer.layout?.visibility !== "none")
          .map((layer) => [
            layer.id,
            layer.type === "raster"
              ? 1
              : gl.map()!.queryRenderedFeatures({ layers: [layer.id] }).length,
          ]),
      ),
      sheets: sheetCache.size,
    }),
  };
}