/* =============================================================================
 * D03_PlanAnalysis_UI_LayerPaint.ts
 * D03 바탕 겹 옛 캔버스 그리기(PLAN 569-2 · 581 · 584 · 586-2) — 그리기 차례 · 색 · 굵기 · 투명도.
 *   GL 바탕(586-2)이 같은 꼴을 MapLibre 로 그림(`D03_PlanAnalysis_UI_MapGl`) · 이것은 GL 을 못 쓰거나 끈 때.
 *   부르는 곳 = `D03_PlanAnalysis_UI_Layers.ts`(받기 · 켬끔 · GL 이면 쉼).
 * ========================================================================== */

import { themeColor } from "@ui/ui_template_palette";
import type { VWorldMeta } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
import {
  createNormalizer,
  drawPreparedLabels,
  lonLatToScreen,
  pickLevelStep,
} from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
import {
  LINE_KEYS,
  LINE_LAYERS,
  ZONE_COLORS,
  drawRaster,
  fillLayer,
  stroke,
  type PlanLayerKey,
} from "./D03_PlanAnalysis_UI_LayerDefs";
import type { Prepared } from "./D03_PlanAnalysis_UI_LayerLegend";
import type { PlanMapLayer } from "./D03_PlanAnalysis_UI_Map";

/** 바탕 겹(아래 → 위) — 켬끔 · 받은 자료 · 위성 틀 · 위성 그림(음영 곱하기)을 그때그때 읽음. */
export function createCanvasLayers(opts: {
  on: Record<PlanLayerKey, boolean>;
  data: Partial<Prepared>;
  meta: () => VWorldMeta | null;
  satellite: () => HTMLImageElement | null;
}): PlanMapLayer[] {
  const { on, data } = opts;
  /** 등고 글 폭 기억(글꼴 하나 · 582). */
  const labelWidths = new Map<string, number>();
  return [
    {
      base: true,
      draw: (context, map) => {
        if (!on.hillshade || !data.hillshade) return;
        // 위성 위 = 곱하기(밝은 곳은 그대로 · 그늘만 짙게) · 위성 없으면 그대로
        if (on.satellite && opts.satellite()) {
          context.globalCompositeOperation = "multiply";
          context.globalAlpha = 0.75;
        }
        drawRaster(context, map, data.hillshade);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.slope || !data.slope) return;
        context.globalAlpha = 0.55;
        drawRaster(context, map, data.slope);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.landslide || !data.landslide) return;
        context.globalAlpha = 0.6;
        drawRaster(context, map, data.landslide);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.soils || !data.soils) return;
        for (const { layer, color } of data.soils.kinds) {
          const fill = themeColor(color, "#facc15");
          fillLayer(context, layer, map.view, fill, 0.35, { color: fill, width: 1.4 });
        }
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.zones || !data.zones) return;
        for (const [kind, layer] of data.zones.kinds) {
          const color = themeColor(ZONE_COLORS[kind] ?? "--draw-warning", "#eab308");
          fillLayer(context, layer, map.view, color, 0.22, { color, width: 1.6 });
        }
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.bands || !data.bands) return;
        const road = themeColor("--draw-map-band-road", "#facc15");
        const stream = themeColor("--draw-map-band-stream", "#22d3ee");
        fillLayer(context, data.bands.road, map.view, road, 0.16, {
          color: road,
          width: 1.2,
          dash: [6, 4],
        });
        fillLayer(context, data.bands.stream, map.view, stream, 0.18, {
          color: stream,
          width: 1.2,
          dash: [6, 4],
        });
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.cadastral || !data.cadastral) return;
        context.globalAlpha = 0.8;
        stroke(context, map, data.cadastral, themeColor("--draw-map-parcel", "#f0abfc"), 0.8);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.water || !data.water) return;
        const color = themeColor("--draw-map-water", "#0ea5e9");
        fillLayer(context, data.water, map.view, color, 0.45, { color, width: 1 });
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.building || !data.building) return;
        const color = themeColor("--draw-map-building", "#fb7185");
        fillLayer(context, data.building, map.view, color, 0.7, {
          color: "rgba(0, 0, 0, 0.55)",
          width: 0.6,
        });
      },
    },
    {
      base: true,
      draw: (context, map) => {
        const contour = on.contour && data.contour;
        if (!contour) return;
        const color = themeColor("--draw-map-contour", "#ffd68c");
        const step = pickLevelStep(contour, map.view, 5);
        context.globalAlpha = 0.7;
        stroke(context, map, contour, color, 0.8, step);
        stroke(context, map, contour, color, 1.6, 25); // 계곡선
        context.globalAlpha = 1;
        context.font = "10px system-ui, sans-serif";
        context.textAlign = "center";
        context.textBaseline = "middle";
        drawPreparedLabels(
          context,
          contour,
          map.view,
          color,
          25,
          map.uprightRad,
          "rgba(0, 0, 0, 0.6)",
          labelWidths,
        );
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.road || !data.road) return;
        stroke(context, map, data.road.all, "rgba(0, 0, 0, 0.55)", 3.2);
        stroke(context, map, data.road.all, themeColor("--draw-map-road", "#f8fafc"), 1.6);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.forestRoad || !data.road) return;
        context.setLineDash([7, 4]);
        stroke(context, map, data.road.small, "rgba(0, 0, 0, 0.55)", 3.6);
        stroke(context, map, data.road.small, themeColor("--draw-map-forest-road", "#f59e0b"), 2);
        context.setLineDash([]);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        const got = on.forestRoadFile && data.forestRoadFile;
        if (!got) return;
        stroke(context, map, got.layer, "rgba(0, 0, 0, 0.55)", 4);
        stroke(context, map, got.layer, themeColor("--draw-map-forest-road-file", "#ea580c"), 2.4);
      },
    },
    {
      base: true,
      draw: (context, map) => {
        if (!on.stream || !data.stream) return;
        const color = themeColor("--draw-map-stream", "#38bdf8");
        stroke(context, map, data.stream[0], color, 1);
        stroke(context, map, data.stream[1], color, 2.4);
      },
    },
    ...LINE_KEYS.map((key): PlanMapLayer => ({
      base: true,
      draw: (context, map) => {
        const got = on[key] && data[key];
        if (!got) return;
        const { color, width, dash } = LINE_LAYERS[key];
        context.setLineDash(dash);
        stroke(context, map, got.layer, "rgba(0, 0, 0, 0.55)", width + 1.6);
        stroke(context, map, got.layer, themeColor(color, "#f43f5e"), width);
        context.setLineDash([]);
      },
    })),
    {
      base: true,
      draw: (context, map) => {
        const got = on.landslideZones && data.landslideZones;
        const meta = opts.meta();
        if (!got || !meta) return;
        const color = themeColor("--draw-map-landslide-zone", "#e11d48");
        // 필지 = 「이 필지 안 어딘가」 테두리만(지정 넓이 ≪ 필지 · 칠하지 않음)
        context.setLineDash([6, 3]);
        stroke(context, map, got.parcels, "rgba(255, 255, 255, 0.7)", 3.2);
        stroke(context, map, got.parcels, color, 1.8);
        context.setLineDash([]);
        const normalizer = createNormalizer(meta);
        context.fillStyle = color;
        context.strokeStyle = "#ffffff";
        context.lineWidth = 1.5;
        for (const point of got.info.points) {
          const [x, y] = lonLatToScreen(normalizer, map.view, point.lon, point.lat);
          if (x < -10 || y < -10 || x > map.view.width + 10 || y > map.view.height + 10) continue;
          context.beginPath();
          context.arc(x, y, 5, 0, Math.PI * 2);
          context.fill();
          context.stroke();
        }
      },
    },
    {
      base: true,
      draw: (context, map) => {
        const meta = opts.meta();
        if (!on.place || !data.place || !meta) return;
        const normalizer = createNormalizer(meta);
        context.font = "600 11px system-ui, sans-serif";
        context.textAlign = "center";
        context.textBaseline = "bottom";
        context.lineWidth = 3;
        context.strokeStyle = "rgba(0, 0, 0, 0.7)";
        context.fillStyle = themeColor("--draw-map-place", "#f8fafc");
        for (const place of data.place) {
          const [x, y] = lonLatToScreen(normalizer, map.view, place.lon, place.lat);
          if (x < -60 || y < -20 || x > map.view.width + 60 || y > map.view.height + 20) continue;
          map.upright(context, x, y, () => {
            context.beginPath();
            context.arc(x, y, 2.5, 0, Math.PI * 2);
            context.fill();
            context.strokeText(place.name, x, y - 4);
            context.fillText(place.name, x, y - 4);
          });
        }
      },
    },
  ];
}