// LIBRARIES
import { Map } from "@maptiler/sdk";
import { polygon } from "@turf/helpers";
import area from "@turf/area";

// PROJECT
import { SelectedFeature } from "../types/types";
import { MAP_STYLE } from "@/constants";
import { LAYERS } from "../layers";
import { layerFilterEq, layerFilterIn } from "@/utilities/layers";
import { UIService } from "./ui-service";

/**
 * Service for managing map interactions and state
 */
export class MapService {
  private uiService: UIService;
  private selected: Array<SelectedFeature> = [];
  public map: Map;

  /**
   * Creates a new MapService instance
   * @param uiService - The UI service for updating interface elements
   */
  public constructor(uiService: UIService) {
    this.uiService = uiService;

    this.map = new Map({
      container: "map",
      style: MAP_STYLE,
    });
  }

  /**
   * Loads the map and initializes all event listeners
   */
  public load() {
    this.map.on("load", () => {
      // Aggiunge tutti i layer custom a codice per le interazioni
      this.map.addLayer(LAYERS.BUILDING_HIGHLIGHT);
      this.map.addLayer(LAYERS.BUILDING_SELECT);

      // Handle map hover.
      this.map.on("mousemove", (e) => {
        // Prende le features solo di questi livelli
        const features = this.map.queryRenderedFeatures(e.point, {
          layers: ["building_matteo", "road_network"],
        });

        // Aggiorna latitudine e longitudine nel container al mouse over.
        this.uiService.$lnglat.html(`${e.lngLat.lng}<br>${e.lngLat.lat}`);

        if (features && features.length > 0) {
          // Prendo l'ID della top level feature in hover
          const hovered = features[0];
          const hoveredId = hovered.id;

          if (hoveredId) {
            // Aggiorna l'ID della feature nel container delle informazioni.
            this.uiService.$info.html(hoveredId?.toString() || "None");
            this.map.setFilter(
              LAYERS.BUILDING_HIGHLIGHT.id,
              layerFilterEq(hoveredId),
            );
            this.map.getCanvas().style.cursor = "pointer";
          }
        } else {
          this.uiService.$info.html("None");
          this.map.getCanvas().style.cursor = "default";
          this.map.setFilter(LAYERS.BUILDING_HIGHLIGHT.id, layerFilterEq());
        }
      });

      this.handleClicks();

      // PROVA ROUTE
      // route(
      //   "routed-foot",
      //   "12.234413623809816,45.486327517344776",
      //   "12.228652238845827,45.48756107353653",
      // ).then((res) => {
      //   map.addSource("route", {
      //     type: "geojson",
      //     data: {
      //       type: "Feature",
      //       properties: {},
      //       geometry: res.routes[0].geometry as GeoJSON.Geometry,
      //     },
      //   });

      //   map.addLayer({
      //     id: "prova",
      //     type: "line",
      //     source: "route",
      //     layout: {
      //       "line-join": "round",
      //       "line-cap": "round",
      //     },
      //     paint: {
      //       "line-color": "#FF0000", // Colore blu
      //       "line-width": 5, // Spessore in pixel
      //       "line-opacity": 0.8,
      //     },
      //   });
      // });
    });
  }

  /**
   * Handles click events on map features
   */
  public handleClicks() {
    this.map.on("click", (e) => {
      const features = this.map.queryRenderedFeatures(e.point, {
        layers: ["building_matteo"],
      });

      if (features && features.length > 0) {
        const clicked = features[0];
        const clickedId: number =
          typeof clicked.id == "string"
            ? parseInt(clicked.id)
            : clicked.id || 0;
        let clickedArea: number = 0.0;

        // Calculate the area of the selected.
        if (
          clicked.geometry.type == "Polygon" &&
          clicked.geometry.coordinates.length > 0
        ) {
          let clickedCoords = clicked.geometry.coordinates[0];
          let clickedPolygon = polygon([clickedCoords]);
          clickedArea = Math.trunc(area(clickedPolygon));
        }

        // Handle "selected list" with deletion.
        const i = this.selected.findIndex((u) => u.id == clickedId);
        if (i !== -1) {
          this.selected.splice(i, 1);
        } else {
          this.selected.push({
            id: clickedId,
            area: clickedArea,
          });
        }

        // Update the "selected" list.
        this.uiService.updateSelectedList(this.selected);

        if (this.selected.length === 0) {
          this.uiService.$selected.append("<div>None</div>");
        }

        // Sets the selected layer.
        if (clickedId) {
          this.map.setFilter(LAYERS.BUILDING_HIGHLIGHT.id, layerFilterEq());
          this.map.setFilter(
            LAYERS.BUILDING_SELECT.id,
            layerFilterIn(
              this.selected.map((s) => {
                return s.id;
              }),
            ),
          );
          this.map.getCanvas().style.cursor = "pointer";
        }
      } else {
        this.map.getCanvas().style.cursor = "default";
      }
    });
  }
}