// Band MHz -> color mapping
const BAND_COLORS = {
  1296:   "#475569", // slate-600
  2304:   "#7c3aed", // violet-600
  3456:   "#4f46e5", // indigo-600
  5760:   "#2563eb", // blue-600
  10000:  "#059669", // emerald-600
  24000:  "#d97706", // amber-600
  47000:  "#ea580c", // orange-600
  68000:  "#dc2626", // red-600
  75000:  "#c026d3", // fuchsia-600
  122000: "#db2777", // pink-600
  134000: "#e11d48", // rose-600
  241000: "#b91c1c", // red-700
}

function bandLabel(mhz) {
  if (mhz >= 1000) {
    const ghz = mhz / 1000
    return (Number.isInteger(ghz) ? ghz : ghz.toFixed(1)) + " GHz"
  }
  return mhz + " MHz"
}

function bandColor(band) {
  return BAND_COLORS[band] || "#64748b"
}

export const ContactsMap = {
  mounted() {
    const contacts = JSON.parse(this.el.dataset.contacts)

    this.map = L.map(this.el, {
      center: [37.5, -96],
      zoom: 5,
      minZoom: 3,
      maxZoom: 14,
      preferCanvas: true
    })

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

    // Group contacts by band for layered rendering
    const byBand = {}
    for (const c of contacts) {
      const band = c[4]
      if (!byBand[band]) byBand[band] = []
      byBand[band].push(c)
    }

    // Collect all endpoint coords for endpoint density layer
    const endpointCounts = {}

    // Draw lines per band — interactive with popups
    const bandLayers = {}
    for (const [band, entries] of Object.entries(byBand)) {
      const color = bandColor(parseInt(band))
      const lines = []

      for (const c of entries) {
        const [lat1, lon1, lat2, lon2, bnd, s1, s2, mode, dist, ts, id] = c
        const line = L.polyline([[lat1, lon1], [lat2, lon2]], {
          color: color,
          weight: 2,
          opacity: 0.5
        })

        const distStr = dist != null ? `${Math.round(dist)} km` : "—"
        line.bindPopup(
          `<div style="font-size:12px;line-height:1.5;">` +
          `<strong>${s1 || "?"} &harr; ${s2 || "?"}</strong><br/>` +
          `${bandLabel(bnd)} &middot; ${mode || "?"}<br/>` +
          `${distStr} &middot; ${ts || "?"} UTC<br/>` +
          `<a href="/contacts/${id}" style="color:#3b82f6;">View details &rarr;</a>` +
          `</div>`,
          {closeButton: false, offset: [0, -4]}
        )

        line.on("mouseover", function() { this.setStyle({weight: 4, opacity: 1}) })
        line.on("mouseout", function() { this.setStyle({weight: 2, opacity: 0.5}) })

        lines.push(line)

        // Track endpoints
        const k1 = `${lat1.toFixed(2)},${lon1.toFixed(2)}`
        const k2 = `${lat2.toFixed(2)},${lon2.toFixed(2)}`
        endpointCounts[k1] = (endpointCounts[k1] || 0) + 1
        endpointCounts[k2] = (endpointCounts[k2] || 0) + 1
      }

      const layer = L.layerGroup(lines)
      bandLayers[band] = layer
      layer.addTo(this.map)
    }

    // Draw endpoint dots sized by density
    const dotLayer = L.layerGroup()
    for (const [key, count] of Object.entries(endpointCounts)) {
      const [lat, lon] = key.split(",").map(Number)
      const radius = Math.min(2 + Math.log2(count) * 1.5, 10)

      L.circleMarker([lat, lon], {
        radius: radius,
        color: "#fff",
        weight: 1,
        fillColor: "#3b82f6",
        fillOpacity: 0.7,
        interactive: false
      }).addTo(dotLayer)
    }
    dotLayer.addTo(this.map)

    // Build legend
    const legend = L.control({position: "bottomright"})
    legend.onAdd = function() {
      const div = L.DomUtil.create("div")
      div.style.cssText = "background:rgba(30,30,40,0.9);color:#fff;padding:8px 12px;border-radius:8px;font-size:11px;line-height:1.6;"

      const sorted = Object.entries(byBand).sort((a, b) => parseInt(a[0]) - parseInt(b[0]))
      let html = "<div style='font-weight:700;margin-bottom:4px;'>Bands</div>"
      for (const [band, entries] of sorted) {
        const color = bandColor(parseInt(band))
        const label = bandLabel(parseInt(band))
        html += `<div><span style="display:inline-block;width:14px;height:3px;background:${color};margin-right:6px;vertical-align:middle;border-radius:1px;"></span>${label} (${entries.length.toLocaleString()})</div>`
      }
      div.innerHTML = html
      return div
    }
    legend.addTo(this.map)
  }
}