/* =============================================================================
 * D03_PlanAnalysis_UI_Layers.ts
 * D03 평면 바탕 겹 켜고 끔(PLAN 569-2 · 581-1 · 581-2 · 584-1 · 584-3 · 요구 395-2 · 440-8 · 442 · 443) — 지도 왼쪽 위 아이콘 한 줄
 *   (공용 지도 도구줄 `createMapTools` · 넘치면 가로 밀기 571-1 · 오른쪽 평면 도구줄과 따로).
 *
 *   겹 = 바탕(위성 · 음영기복 · 도엽 등고선(계곡선 25 m 굵게 · 수치) · 급경사 색) ·
 *        물 · 길(세류선 · 하천 · 물 면(실폭하천 · 저수지) · 기존 도로 · 기존 임도 짐작(소로 · 미분류) ·
 *          올린 임도망도(시군구 SHP · 옆 올리기 단추)) ·
 *        구역(지적도 · 보호 · 규제 구역 여덟 종 · 산림입지도(토양형) · 산사태위험지도 · 산사태취약지역(시도 표 점 · 지번 필지 테두리) ·
 *          선 겹(단층 · 지질구조선 · 0차곡) ·
 *        계류 100 m · 도로 300 m 띠 · 건물 · 지명).
 *   처음 켬 = 위성 · 등고선 · 세류 · 고른 값 = 화면 취향(`aislo:pref:d03.layers`) 기억.
 *   받기 = 켤 때만(한 번 받으면 다시 안 받음) · 지형을 안 받았으면 단추를 막음 · 받기 실패 = 그 겹만 꺼짐 + 알림.
 *   그리기 차례(아래 → 위) = 위성(`scene.image`) → 음영기복 → 급경사 → 산사태위험지도 → 산림입지도 → 보호구역 → 띠 → 지적 → 물 면 →
 *        건물 → 등고선 → 도로 → 임도 짐작 → 올린 임도망도 → 세류 → 선 겹 → 산사태취약지역 → 지명 → 그은 선.
 *   겹 모두 = 바탕 캔버스(`base` · 582) · 등고선 = 줌 단계 색인 · 글 폭 기억.
 *   범례 = 켠 겹의 받은 범위 안 수 · 넓이(왼쪽 아래 · `D03_PlanAnalysis_UI_LayerLegend`).
 *   GL 바탕(586-2 · 처음 = 켬 · 끝 단추 끔 = 옛 캔버스 · `aislo:pref:d03.canvas`) — 겹 스물 · 등고 글 · 지명을
 *     MapLibre 가 그림(`D03_PlanAnalysis_UI_MapGl`) · 캔버스 바탕 겹은 쉼(등고 간격 셈만) · 받기 · 범례는 같음 ·
 *     WebGL 못 씀 · 잃음 = 저절로 옛 캔버스 + 알림(취향은 안 바꿈).
 * ========================================================================== */

import { showToast } from "@ui/ui_template_elements";
import { createLegend } from "@ui/ui_template_flow_legend";
import { pickFiles } from "@ui/ui_template_drop";
import { createIconButton } from "@ui/ui_template_button";
import { createMapTools } from "@ui/ui_template_map_tools";
import { themeColor } from "@ui/ui_template_palette";
import { fetchCachedSheetLayer } from "../A00_Common/b_asset_cache";
import { readByKey, writeByKey } from "../A00_Common/b_page_state";
import {
  fetchVWorldMeta,
  getVWorldMapUrl,
  type VWorldMeta,
} from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
import {
  createNormalizer,
  pickLevelStep,
  type GeoJsonCollection,
  type PreparedLayer,
} from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
import {
  indexLayerLod,
  prepareLayer,
} from "../B04_PreProcess/logic/B04_PreProcess_UI_MapRender_Prepare";
import {
  fetchPlanBands,
  fetchPlanCadastral,
  fetchPlanForestRoads,
  fetchPlanLandslideZones,
  fetchPlanLines,
  fetchPlanRaster,
  fetchPlanSheetLayer,
  fetchPlanSoils,
  fetchPlanZeroOrder,
  fetchPlanZones,
  uploadPlanForestRoads,
} from "./D03_PlanAnalysis_Api";
import {
  FOREST_ROAD_KINDS,
  GROUPS,
  LAYERS,
  LINE_LAYERS,
  SOIL_COLORS,
  WATER_KEYS,
  ZONE_COLORS,
  glImage,
  glTagged,
  loadImage,
  readPref,
  shadeImage,
  type PlanLayerKey,
} from "./D03_PlanAnalysis_UI_LayerDefs";
import { layerCounts, legendRows, type Prepared } from "./D03_PlanAnalysis_UI_LayerLegend";
import { createCanvasLayers } from "./D03_PlanAnalysis_UI_LayerPaint";
import { createGlBase, GL_FONT, type GlImage } from "./D03_PlanAnalysis_UI_MapGl";
import type { PlanMap, PlanMapLayer } from "./D03_PlanAnalysis_UI_Map";
import type { Vertex } from "./logic/D03_PlanAnalysis_Plan";

const PREF_KEY = "aislo:pref:d03.layers";
/** GL 글꼴 미리 받음 — 받기 전에 그린 글자는 대체 글꼴로 굳음(못 받아도 그림). */
const glFont = (weight: string, text: string): Promise<unknown> =>
  document.fonts.load(`${weight} 24px "${GL_FONT}"`, text || "가").catch(() => null);
/** 옛 캔버스로 그림("1") — 처음 = GL. */
const CANVAS_PREF_KEY = "aislo:pref:d03.canvas";
/** 등고선을 받아 올 그은 선 둘레(m). */
const CONTOUR_PAD_M = 600;
type DataKey = keyof Prepared;

/** 겹 → 받는 자료(임도 짐작 = 도로 자료). */
const dataKey = (key: Exclude<PlanLayerKey, "satellite">): DataKey =>
  key === "forestRoad" ? "road" : key;

export interface PlanLayers {
  bar: HTMLElement;
  legend: HTMLElement;
  /** 바탕 겹(아래 → 위 · 위성 뺌) — 그은 선 겹 아래에 둠. */
  layers: PlanMapLayer[];
  /** 지형(위성 틀)을 다시 읽음 — 처음 · 지형 받은 뒤. */
  load: () => Promise<void>;
  /** 검증 창구 — 켬끔 · 받은 겹 · 겹별 수(지물 · 넓이 m²). */
  state: () => {
    on: Record<PlanLayerKey, boolean>;
    loaded: PlanLayerKey[];
    counts: Record<string, number>;
    /** GL 겹마다 화면에 그린 지물 수(보임만 · GL 끔 = 빈 것). */
    gl: Record<string, number>;
  };
}

export function createPlanLayers(opts: {
  projectId: string;
  map: PlanMap;
  /** 등고선 받을 범위를 정할 점(시점 · 종점 · 그은 선). */
  points: () => Vertex[];
}): PlanLayers {
  const { projectId, map } = opts;
  const on = readPref(PREF_KEY);
  const data: Partial<Prepared> = {};
  const pending = new Map<DataKey | "satellite", Promise<void>>();
  let uploading = false;
  let meta: VWorldMeta | null = null;
  let satellite: HTMLImageElement | null = null;
  /** 음영 GL 그림 — 그대로 · 위성 위 그늘(「곱하기」 꼴). */
  let hillshade: { plain: GlImage; shade: GlImage } | null = null;
  const gl = createGlBase(projectId, (why) => {
    if (!glOn) return;
    showToast(`그래픽 카드 그림을 못 써 옛 그림으로 — ${why}`, "info");
    useGl(false);
  });
  let glOn = readByKey(CANVAS_PREF_KEY) !== "1";

  const buttons = new Map<PlanLayerKey, HTMLButtonElement>();
  const groups = GROUPS.map((group) =>
    group.map((def) => {
      const button = createIconButton({
        icon: def.icon,
        title: def.title,
        size: 32,
        pressed: on[def.key],
        onClick: () => toggle(def.key),
      });
      button.dataset.layer = def.key;
      buttons.set(def.key, button);
      return button;
    }),
  );
  const upload = createIconButton({
    icon: "upload",
    title: "임도망도 SHP 올리기(시군구 zip 하나 · 또는 shp · shx · dbf · prj 함께 · 100 MB 까지)",
    size: 32,
    onClick: () =>
      pickFiles(
        { accept: ".zip,.shp,.shx,.dbf,.prj,.cpg", multiple: true },
        (files) => void uploadRoads(files),
      ),
  });
  upload.dataset.layer = "forestRoadUpload";
  const roadGroup = groups.find((group) => group.includes(buttons.get("forestRoadFile")!))!;
  roadGroup.splice(roadGroup.indexOf(buttons.get("forestRoadFile")!) + 1, 0, upload);
  const glButton = createIconButton({
    icon: "gauge",
    title: "그래픽 카드 그림(바탕 겹 · 글을 GPU 로 · 끔 = 옛 캔버스 그림)",
    size: 32,
    pressed: glOn,
    onClick: () => {
      writeByKey(CANVAS_PREF_KEY, glOn ? "1" : "0");
      useGl(!glOn);
    },
  });
  glButton.dataset.layer = "gl";
  /** GL ↔ 옛 캔버스 — 못 켜면 캔버스(알림은 `onFail`). */
  function useGl(want: boolean): void {
    glOn = want && map.setGl(gl);
    if (!glOn) map.setGl(null);
    glButton.setAttribute("aria-pressed", String(glOn));
    void ensure("satellite");
    showSatellite();
    map.redrawBase();
  }
  groups.push([glButton]);
  const tools = createMapTools({ label: "지도 겹", groups });
  const bar = tools.root;
  bar.classList.add("d03-plan__layers");
  // 571-1 — 오른쪽 평면 도구줄이 이 줄 오른쪽부터(CSS `--d03-layers-w`)
  new ResizeObserver(() =>
    map.root.style.setProperty("--d03-layers-w", `${tools.bar.offsetWidth}px`),
  ).observe(tools.bar);
  const legend = document.createElement("div");
  legend.className = "d03-plan__legend";
  legend.title = "켠 겹 범례 — 받은 지형 범위 안 수 · 넓이";

  /** 받음 — 위성은 GL 이면 조각(한 장 그림 안 받음). */
  const loadedOf = (key: PlanLayerKey): boolean =>
    key === "satellite" ? glOn || !!satellite : !!data[dataKey(key)];

  function sync(): void {
    for (const def of LAYERS) {
      const button = buttons.get(def.key)!;
      button.setAttribute("aria-pressed", String(on[def.key]));
      button.disabled = !meta;
      const title = meta ? def.title : `${def.title} — 지형 받기 뒤 보임`;
      button.title = title;
      button.setAttribute("aria-label", title);
    }
    upload.disabled = !meta || uploading;
    for (const def of LAYERS) gl.setVisible(def.key, on[def.key]);
    gl.setData("hillshade", hillshade && (on.satellite ? hillshade.shade : hillshade.plain));
    const rows = meta ? legendRows(on, data) : [];
    legend.replaceChildren(...rows.map((row) => createLegend(row)));
    legend.hidden = !rows.length;
  }

  sync();
  useGl(glOn);

  function toggle(key: PlanLayerKey): void {
    on[key] = !on[key];
    writeByKey(PREF_KEY, JSON.stringify(on));
    void ensure(key);
    showSatellite();
    sync();
    map.redrawBase();
  }

  function showSatellite(): void {
    map.update({ image: on.satellite ? satellite : null });
  }

  /** 켜진 겹의 자료를 받음(한 번) — 실패 = 그 겹만 끔(기억은 안 바꿈 · 다음에 다시 받음) + 알림. */
  function ensure(key: PlanLayerKey): Promise<void> {
    if (!meta || !on[key] || loadedOf(key)) return Promise.resolve();
    const slot = key === "satellite" ? key : dataKey(key);
    const running = pending.get(slot);
    if (running) return running;
    const at = meta;
    const job = fetchLayer(key, at)
      .then(() => {
        if (meta !== at) return;
        showSatellite();
        sync();
        map.redrawBase();
      })
      .catch((error: unknown) => {
        const text = error instanceof Error ? error.message : String(error);
        for (const def of LAYERS)
          if (def.key === key || (def.key !== "satellite" && dataKey(def.key) === slot))
            on[def.key] = false;
        sync();
        map.redraw();
        showToast(`${LAYERS.find((def) => def.key === key)!.title} 받지 못함 — ${text}`, "error");
      })
      .finally(() => pending.delete(slot));
    pending.set(slot, job);
    return job;
  }

  /** 올리기 — 받으면 그 겹을 켜고 바로 그림 · 못 받으면 옛 것 그대로 + 서버 까닭 알림. */
  async function uploadRoads(files: File[]): Promise<void> {
    if (!meta) return;
    const at = meta;
    const job = uploadPlanForestRoads(projectId, files).then((info) => {
      if (meta !== at) return;
      data.forestRoadFile = {
        layer: prepareLayer(info.collection, createNormalizer(at)),
        info,
      };
      gl.setData("forestRoadFile", info.collection);
      on.forestRoadFile = true;
      writeByKey(PREF_KEY, JSON.stringify(on));
      showToast(
        `임도망도 받음 — 범위 안 ${info.count}가닥 ${(info.length_m / 1000).toFixed(2)} km (파일 ${info.total}가닥)`,
        "success",
      );
    });
    uploading = true;
    pending.set("forestRoadFile", job);
    sync();
    try {
      await job;
    } catch (error) {
      showToast(
        `임도망도 올리지 못함 — ${error instanceof Error ? error.message : String(error)}`,
        "error",
      );
    } finally {
      uploading = false;
      pending.delete("forestRoadFile");
      sync();
      map.redrawBase();
    }
  }

  async function fetchLayer(key: PlanLayerKey, at: VWorldMeta): Promise<void> {
    const normalizer = createNormalizer(at);
    const prepare = (collection: GeoJsonCollection, labels?: string[]): PreparedLayer =>
      prepareLayer(collection, normalizer, labels);
    const pick = (
      collection: GeoJsonCollection,
      test: (props: Record<string, unknown>) => boolean,
    ): GeoJsonCollection => ({
      ...collection,
      features: (collection.features ?? []).filter((feature) => test(feature.properties ?? {})),
    });
    if (key === "satellite") {
      if (glOn) return; // GL = 조각
      // 범위가 넓어지면 주소가 바뀌어 옛 그림을 안 씀
      const v = `${at.x_min}_${at.x_max}_${at.y_min}_${at.y_max}`;
      satellite = await loadImage(`${getVWorldMapUrl(projectId, "satellite")}&v=${v}`);
    } else if (key === "contour") {
      const points = opts.points();
      const xs = points.map(([x]) => x);
      const ys = points.map(([, y]) => y);
      const bbox = [
        Math.min(...xs) - CONTOUR_PAD_M,
        Math.min(...ys) - CONTOUR_PAD_M,
        Math.max(...xs) + CONTOUR_PAD_M,
        Math.max(...ys) + CONTOUR_PAD_M,
      ].map((v) => v.toFixed(0));
      const [collection] = await Promise.all([
        fetchCachedSheetLayer<GeoJsonCollection>(projectId, "도엽_등고선", "route", bbox.join(",")),
        glFont("400", "0123456789-"),
      ]);
      data.contour = indexLayerLod(prepare(collection, ["등고수치"]));
      gl.setData("contour", collection);
    } else if (key === "stream") {
      const collection = await fetchCachedSheetLayer<GeoJsonCollection>(
        projectId,
        "도엽_하천중심선",
      );
      data.stream = [
        prepare(pick(collection, (props) => props["구분"] === "세류")),
        prepare(pick(collection, (props) => props["구분"] !== "세류")),
      ];
      gl.setData("stream", collection);
    } else if (key === "cadastral") {
      const collection = await fetchPlanCadastral(projectId);
      data.cadastral = prepare(collection);
      gl.setData("cadastral", collection);
    } else if (key === "road" || key === "forestRoad") {
      const collection = await fetchPlanSheetLayer(projectId, "도로중심선");
      data.road = {
        all: prepare(collection),
        small: prepare(
          pick(collection, (props) => FOREST_ROAD_KINDS.has(String(props["도로구분"]))),
        ),
      };
      gl.setData("road", collection);
    } else if (key === "forestRoadFile") {
      const info = await fetchPlanForestRoads(projectId);
      data.forestRoadFile = { layer: prepare(info.collection), info };
      gl.setData("forestRoadFile", info.collection);
    } else if (key === "landslideZones") {
      const info = await fetchPlanLandslideZones(projectId);
      data.landslideZones = { parcels: prepare(info.parcels), info };
      gl.setData("landslideZones", {
        features: [
          ...(info.parcels.features ?? []),
          ...info.points.map((point) => ({
            type: "Feature",
            properties: {},
            geometry: { type: "Point", coordinates: [point.lon, point.lat] },
          })),
        ],
      } as GeoJsonCollection);
      if (info.missing.length)
        showToast(`산사태취약지역 — ${info.missing.join(" · ")} 자료 없음`, "info");
    } else if (key === "slope" || key === "hillshade" || key === "landslide") {
      const raster = await fetchPlanRaster(projectId, key);
      const image = await loadImage(raster.image);
      data[key] = { raster, image };
      const plain = glImage(raster);
      if (key !== "hillshade") gl.setData(key, plain);
      else if (plain) hillshade = { plain, shade: glImage(raster, shadeImage(image))! };
    } else if (key === "water") {
      const parts = await Promise.all(
        WATER_KEYS.map((name) => fetchPlanSheetLayer(projectId, name)),
      );
      const water = { features: parts.flatMap((part) => part.features ?? []) };
      data.water = prepare(water);
      gl.setData("water", water);
    } else if (key === "building") {
      const building = await fetchPlanSheetLayer(projectId, "건물");
      data.building = prepare(building);
      gl.setData("building", building);
    } else if (key === "zones") {
      const zones = await fetchPlanZones(projectId);
      const kinds = new Map<string, PreparedLayer>();
      for (const kind of Object.keys(zones.summary))
        kinds.set(kind, prepare(pick(zones, (props) => props["kind"] === kind)));
      data.zones = { kinds, summary: zones.summary };
      gl.setData(
        "zones",
        glTagged(zones, (props) =>
          themeColor(ZONE_COLORS[String(props["kind"])] ?? "--draw-warning", "#eab308"),
        ),
      );
      const failed = Object.values(zones.summary).filter((kind) => kind.failed);
      if (failed.length)
        showToast(
          `보호 · 규제 구역 일부 받지 못함 — ${failed.map((kind) => kind.label).join(" · ")}`,
          "error",
        );
    } else if (key === "soils") {
      const soils = await fetchPlanSoils(projectId);
      data.soils = {
        kinds: soils.summary.map((soil, i) => ({
          layer: prepare(pick(soils, (props) => props["code"] === soil.code)),
          color: SOIL_COLORS[i % SOIL_COLORS.length],
        })),
        summary: soils.summary,
      };
      const colorOf = new Map(
        soils.summary.map((soil, i) => [soil.code, data.soils!.kinds[i].color]),
      );
      gl.setData(
        "soils",
        glTagged(soils, (props) =>
          themeColor(colorOf.get(props["code"] as never) ?? "", "#facc15"),
        ),
      );
    } else if (key === "faults" || key === "lineaments" || key === "zeroOrder") {
      const kind = LINE_LAYERS[key].kind;
      // 0차곡 첫 셈 = 몇 초 — 늦으면 알림
      const slow = window.setTimeout(
        () => showToast(`${LINE_LAYERS[key].label} 셈 중 — 처음 한 번만`, "info"),
        600,
      );
      try {
        const got = kind
          ? await fetchPlanLines(projectId, kind).then((lines) => ({
              collection: lines,
              ...lines.summary,
            }))
          : await fetchPlanZeroOrder(projectId);
        data[key] = {
          layer: prepare(got.collection),
          count: got.count,
          length_m: got.length_m,
        };
        gl.setData(key, got.collection);
      } finally {
        window.clearTimeout(slow);
      }
    } else if (key === "bands") {
      const info = await fetchPlanBands(projectId);
      data.bands = {
        stream: prepare(info.stream.collection),
        road: prepare(info.road.collection),
        info,
      };
      const band = (name: "stream" | "road", fallback: string): GeoJsonCollection =>
        glTagged(info[name].collection, () => themeColor(`--draw-map-band-${name}`, fallback), {
          _band: name,
        });
      gl.setData("bands", {
        features: [
          ...(band("road", "#facc15").features ?? []),
          ...(band("stream", "#22d3ee").features ?? []),
        ],
      });
    } else {
      const collection = await fetchPlanSheetLayer(projectId, "지명");
      data.place = (collection.features ?? []).flatMap((feature) => {
        const geometry = feature.geometry;
        const name = feature.properties?.["명칭"];
        if (geometry?.type !== "Point" || typeof name !== "string" || !name) return [];
        const [lon, lat] = geometry.coordinates as number[];
        return [{ lon, lat, name }];
      });
      await glFont("600", data.place.map((place) => place.name).join(""));
      gl.setData("place", {
        features: data.place.map(({ lon, lat, name }) => ({
          type: "Feature",
          properties: { name },
          geometry: { type: "Point", coordinates: [lon, lat] },
        })),
      } as GeoJsonCollection);
    }
  }

  const canvasLayers = createCanvasLayers({
    on,
    data,
    meta: () => meta,
    satellite: () => satellite,
  });

  /** GL 이면 캔버스 바탕 겹은 쉼 — 등고 주곡선 간격(화면 안 가닥 수)만 셈. */
  const layers: PlanMapLayer[] = [
    ...canvasLayers.map((layer): PlanMapLayer => ({
      ...layer,
      draw: (c, m) => void (glOn || layer.draw(c, m)),
    })),
    {
      base: true,
      draw: (_, m) => {
        if (glOn && on.contour && data.contour)
          gl.setContourStep(pickLevelStep(data.contour, m.view, 5));
      },
    },
  ];

  async function load(): Promise<void> {
    const next = await fetchVWorldMeta(projectId, "satellite").catch(() => null);
    const changed =
      JSON.stringify(next && [next.x_min, next.x_max, next.y_min, next.y_max]) !==
      JSON.stringify(meta && [meta.x_min, meta.x_max, meta.y_min, meta.y_max]);
    meta = next;
    if (changed) {
      satellite = null;
      for (const key of Object.keys(data)) delete data[key as DataKey];
      hillshade = null;
      for (const def of LAYERS)
        if (def.key !== "satellite" && def.key !== "forestRoad") gl.setData(def.key, null);
    }
    map.update({ meta });
    showSatellite();
    sync();
    await Promise.all(LAYERS.map((def) => ensure(def.key)));
  }

  return {
    bar,
    legend,
    layers,
    load,
    state: () => ({
      on: { ...on },
      loaded: LAYERS.map((def) => def.key).filter(loadedOf),
      counts: layerCounts(data),
      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,
          ]),
      ),
    }),
  };
}