export const RoverMap = {
  mounted() {
    this.stations = []
    this.stationMarkers = L.layerGroup()
    this.coverageLayer = L.layerGroup()

    const map = L.map(this.el, {
      center: [33.2, -97.1],
      zoom: 7,
      zoomControl: true,
      attributionControl: false
    })

    L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
      maxZoom: 19
    }).addTo(map)

    this.map = map
    this.stationMarkers.addTo(map)
    this.coverageLayer.addTo(map)

    this.gridLayer = L.layerGroup().addTo(map)
    this.drawGridOverlay()

    this.handleEvent("stations_updated", ({ stations }) => {
      this.stations = stations
      this.renderStations()
    })

    this.handleEvent("coverage_updated", ({ grids }) => {
      this.renderCoverage(grids)
    })

    this.handleEvent("toggle_grids", ({ show }) => {
      if (show) {
        this.gridLayer.addTo(this.map)
      } else {
        this.map.removeLayer(this.gridLayer)
      }
    })
  },

  renderStations() {
    this.stationMarkers.clearLayers()

    for (const s of this.stations) {
      const marker = L.circleMarker([s.lat, s.lon], {
        radius: 7,
        color: "#fff",
        weight: 2,
        fillColor: "#3b82f6",
        fillOpacity: 0.9,
        interactive: true,
        pane: "markerPane"
      })

      marker.bindTooltip(s.label, {
        permanent: true,
        direction: "top",
        offset: [0, -10],
        className: "station-label"
      })

      this.stationMarkers.addLayer(marker)
    }

    this.fitBounds()
  },

  renderCoverage(grids) {
    this.coverageLayer.clearLayers()

    if (!grids || grids.length === 0) return

    const maxScore = Math.max(...grids.map(g => g.coverage_score))

    for (const g of grids) {
      // Render as 0.25° cells centered on the candidate point
      const half = 0.125
      const bounds = [[g.lat - half, g.lon - half], [g.lat + half, g.lon + half]]

      const normalized = maxScore > 0 ? g.coverage_score / maxScore : 0
      const color = this.coverageColor(normalized)
      const opacity = 0.15 + normalized * 0.45

      const rect = L.rectangle(bounds, {
        color: color,
        weight: 1,
        opacity: 0.5,
        fillColor: color,
        fillOpacity: opacity,
        interactive: true
      })

      const pctStations = Math.round(g.stations_in_range / g.total_stations * 100)
      rect.bindTooltip(
        `<b>${g.grid}</b><br>` +
        `Coverage: ${g.coverage_score}/100<br>` +
        `Stations: ${g.stations_in_range}/${g.total_stations} (${pctStations}%)<br>` +
        `Propagation: ${g.prop_score}/100` +
        (g.best_hour ? `<br>Best: ${g.best_hour} UTC` : ""),
        { sticky: true }
      )

      rect.on("click", () => {
        this.pushEvent("select_grid", { grid: g.grid })
      })

      this.coverageLayer.addLayer(rect)
    }

    // Add rank labels to top 5
    const top5 = grids.slice(0, 5)
    for (let i = 0; i < top5.length; i++) {
      const g = top5[i]
      const icon = L.divIcon({
        html: `<div style="
          background: ${this.coverageColor(1 - i * 0.15)};
          color: #000;
          width: 24px; height: 24px;
          border-radius: 50%;
          border: 2px solid white;
          display: flex; align-items: center; justify-content: center;
          font-weight: bold; font-size: 12px;
          box-shadow: 0 2px 4px rgba(0,0,0,0.4);
        ">${i + 1}</div>`,
        className: "",
        iconSize: [24, 24],
        iconAnchor: [12, 12]
      })

      L.marker([g.lat, g.lon], { icon, interactive: false, pane: "markerPane" })
        .addTo(this.coverageLayer)
    }
  },

  gridBounds(grid) {
    // Decode 4-char Maidenhead to lat/lon bounds
    if (grid.length < 4) return null
    const lonField = grid.charCodeAt(0) - 65 // A=0
    const latField = grid.charCodeAt(1) - 65
    const lonSq = parseInt(grid[2])
    const latSq = parseInt(grid[3])

    const lon1 = lonField * 20 - 180 + lonSq * 2
    const lat1 = latField * 10 - 90 + latSq * 1
    const lon2 = lon1 + 2
    const lat2 = lat1 + 1

    return [[lat1, lon1], [lat2, lon2]]
  },

  coverageColor(normalized) {
    // Green (best) → Yellow → Red (worst)
    if (normalized >= 0.7) return "#00ffa3"
    if (normalized >= 0.5) return "#7dffd4"
    if (normalized >= 0.3) return "#ffe566"
    if (normalized >= 0.15) return "#ff9044"
    return "#ff4f4f"
  },

  drawGridOverlay() {
    for (let lat = 25; lat <= 50; lat += 1) {
      L.polyline([[lat, -125], [lat, -66]], {
        color: "#888", weight: 0.5, opacity: 0.3
      }).addTo(this.gridLayer)
    }
    for (let lon = -125; lon <= -66; lon += 2) {
      L.polyline([[25, lon], [50, lon]], {
        color: "#888", weight: 0.5, opacity: 0.3
      }).addTo(this.gridLayer)
    }
  },

  fitBounds() {
    const points = this.stations.map(s => [s.lat, s.lon])
    if (points.length >= 2) {
      this.map.fitBounds(points, { padding: [60, 60], maxZoom: 9 })
    } else if (points.length === 1) {
      this.map.setView(points[0], 8)
    }
  }
}