import topbar from "../vendor/topbar"

const FACTOR_META = {
  humidity:      { label: "Humidity",       weight: 0.20, unit: "g/m\u00b3" },
  time_of_day:   { label: "Time of Day",    weight: 0.20, unit: "" },
  td_depression: { label: "Td Depression",  weight: 0.12, unit: "\u00b0F" },
  refractivity:  { label: "Refractivity",   weight: 0.10, unit: "N/km" },
  sky:           { label: "Sky Cover",      weight: 0.10, unit: "%" },
  season:        { label: "Season",         weight: 0.10, unit: "" },
  rain:          { label: "Rain",           weight: 0.08, unit: "" },
  wind:          { label: "Wind",           weight: 0.06, unit: "kts" },
  pressure:      { label: "Pressure",       weight: 0.04, unit: "mb" }
}

const FACTOR_ORDER = [
  "humidity", "time_of_day", "td_depression", "refractivity",
  "sky", "season", "rain", "wind", "pressure"
]

function scoreTier(score) {
  if (score >= 80) return { label: "EXCELLENT", color: "#00ffa3" }
  if (score >= 65) return { label: "GOOD", color: "#7dffd4" }
  if (score >= 50) return { label: "MARGINAL", color: "#ffe566" }
  if (score >= 33) return { label: "POOR", color: "#ff9044" }
  return { label: "NEGLIGIBLE", color: "#ff4f4f" }
}

function factorBar(score) {
  const filled = Math.round(score / 5)
  const empty = 20 - filled
  const tier = scoreTier(score)
  return `<span style="color:${tier.color}">${"\u2588".repeat(filled)}</span><span style="color:#555">${"\u2591".repeat(empty)}</span>`
}

function rangeEstimate(score, detail) {
  if (score >= 80) return `${detail.extended_range_km}\u2013${detail.exceptional_range_km}+ km`
  if (score >= 65) return `${detail.typical_range_km}\u2013${detail.extended_range_km} km`
  if (score >= 50) return `${Math.round(detail.typical_range_km * 0.7)}\u2013${detail.typical_range_km} km`
  if (score >= 33) return `${Math.round(detail.typical_range_km * 0.4)}\u2013${Math.round(detail.typical_range_km * 0.7)} km`
  return `<${Math.round(detail.typical_range_km * 0.4)} km`
}

function buildPopupHTML(detail) {
  const tier = scoreTier(detail.score)
  const range = rangeEstimate(detail.score, detail)
  const time = new Date(detail.valid_time).toISOString().replace("T", " ").slice(0, 16) + " UTC"

  let rows = ""
  for (const key of FACTOR_ORDER) {
    const meta = FACTOR_META[key]
    const value = detail.factors[key]
    if (value === undefined) continue
    const pct = Math.round(meta.weight * 100)
    rows += `<tr>
      <td style="padding:1px 6px 1px 0;white-space:nowrap;font-size:11px;">${meta.label}</td>
      <td style="padding:1px 4px;font-family:monospace;font-size:11px;letter-spacing:-0.5px;">${factorBar(value)}</td>
      <td style="padding:1px 4px;text-align:right;font-size:11px;font-weight:600;">${value}</td>
      <td style="padding:1px 4px;font-size:10px;color:#888;">(${pct}%)</td>
    </tr>`
  }

  return `<div style="color:#333;min-width:280px;">
    <div style="display:flex;justify-content:space-between;align-items:baseline;margin-bottom:4px;">
      <strong style="font-size:16px;">${detail.score}/100</strong>
      <span style="background:${tier.color};color:#000;padding:1px 8px;border-radius:4px;font-size:11px;font-weight:700;">${tier.label}</span>
    </div>
    <div style="font-size:12px;color:#666;margin-bottom:6px;">
      ${detail.band_label} &mdash; Est. range: ${range} (CW)<br>
      ${detail.lat.toFixed(3)}\u00b0N, ${Math.abs(detail.lon).toFixed(3)}\u00b0W &mdash; ${time}
    </div>
    <table style="width:100%;border-collapse:collapse;border-top:1px solid #ddd;padding-top:4px;">
      ${rows}
    </table>
  </div>`
}

// --- Maidenhead Grid Square ---

class GridSquare {
  constructor(lat, lon) {
    this.lat = lat
    this.lon = ((lon % 360) + 540) % 360 - 180
  }

  encode(precision = 4) {
    const adjLon = this.lon + 180
    const adjLat = this.lat + 90
    let g = ""
    g += String.fromCharCode(65 + Math.floor(adjLon / 20))
    g += String.fromCharCode(65 + Math.floor(adjLat / 10))
    g += Math.floor((adjLon % 20) / 2)
    g += Math.floor(adjLat % 10)
    if (precision > 4) {
      g += String.fromCharCode(97 + Math.floor(((adjLon % 2) * 60) / 5))
      g += String.fromCharCode(97 + Math.floor(((adjLat % 1) * 60) / 2.5))
    }
    return g
  }

  static decode(grid) {
    const f1 = grid.charCodeAt(0) - 65
    const f2 = grid.charCodeAt(1) - 65
    let west = f1 * 20 - 180
    let south = f2 * 10 - 90
    let w = 20, h = 10

    if (grid.length >= 4) {
      west += parseInt(grid[2]) * 2
      south += parseInt(grid[3])
      w = 2; h = 1
    }
    if (grid.length >= 6) {
      west += (grid.charCodeAt(4) - 97) * 5 / 60
      south += (grid.charCodeAt(5) - 97) * 2.5 / 60
      w = 5 / 60; h = 2.5 / 60
    }
    return {
      west, east: west + w, south, north: south + h,
      center: { lat: south + h / 2, lon: west + w / 2 }
    }
  }
}

function drawGridSquare(grid, precision, bounds, zoom, layerGroup, drawnSet, map) {
  if (grid.length < 2 || drawnSet.has(grid)) return
  drawnSet.add(grid)

  const c = GridSquare.decode(grid)
  if (c.west > bounds.getEast() || c.east < bounds.getWest() ||
      c.south > bounds.getNorth() || c.north < bounds.getSouth()) return

  const field = precision <= 2

  layerGroup.addLayer(L.rectangle(
    [[c.south, c.west], [c.north, c.east]],
    { color: "#E63946", weight: field ? 2.5 : 2, opacity: 0.8, fillOpacity: 0, interactive: false }
  ))

  const sw = map.latLngToContainerPoint([c.south, c.west])
  const ne = map.latLngToContainerPoint([c.north, c.east])
  const px = Math.abs(ne.x - sw.x)
  const minW = field ? 30 : 40
  if (px > minW) {
    const len = field ? 2 : 4
    const text = grid.substring(0, len)
    const fs = Math.max(10, Math.min(14, Math.round(px / (len * 1.2))))
    layerGroup.addLayer(L.marker([c.center.lat, c.center.lon], {
      interactive: false,
      icon: L.divIcon({
        className: "grid-label",
        html: `<div style="font-size:${fs}px;font-weight:bold;color:#fff;background:rgba(0,0,0,0.5);padding:1px 4px;border-radius:3px;white-space:nowrap;width:fit-content;">${text}</div>`,
        iconSize: [Math.round(len * fs * 0.8), Math.round(fs * 1.5)],
        iconAnchor: [Math.round(len * fs * 0.4), Math.round(fs * 0.75)]
      })
    }))
  }
}

function updateGridOverlay(map, gridLayer) {
  gridLayer.clearLayers()
  const drawn = new Set()
  const bounds = map.getBounds()
  const zoom = map.getZoom()
  const showSquares = zoom >= 7

  const south = Math.max(bounds.getSouth(), -90)
  const north = Math.min(bounds.getNorth(), 90)

  if (!showSquares) {
    const fW = Math.floor((bounds.getWest() + 180) / 20) * 20 - 180
    const fE = Math.ceil((bounds.getEast() + 180) / 20) * 20 - 180
    const fS = Math.floor((south + 90) / 10) * 10 - 90
    const fN = Math.ceil((north + 90) / 10) * 10 - 90
    for (let lon = fW; lon < fE; lon += 20) {
      for (let lat = fS; lat < fN; lat += 10) {
        const nLon = ((lon % 360) + 540) % 360 - 180
        const g = new GridSquare(lat + 5, nLon + 10).encode(4).substring(0, 2)
        drawGridSquare(g, 2, bounds, zoom, gridLayer, drawn, map)
      }
    }
    return
  }

  const wE = Math.floor((bounds.getWest() + 180) / 2) * 2 - 180
  const eE = Math.ceil((bounds.getEast() + 180) / 2) * 2 - 180
  const sE = Math.floor(south + 90) - 90
  const nE = Math.ceil(north + 90) - 90
  if (Math.ceil((eE - wE) / 2) * Math.ceil(nE - sE) > 500) return

  for (let lon = wE; lon < eE; lon += 2) {
    for (let lat = sE; lat < nE; lat += 1) {
      const nLon = ((lon % 360) + 540) % 360 - 180
      const g = new GridSquare(lat + 0.5, nLon + 1).encode(4)
      drawGridSquare(g.substring(0, 4), 4, bounds, zoom, gridLayer, drawn, map)
    }
  }
}

// --- Hook ---

export const PropagationMap = {
  mounted() {
    this.map = L.map(this.el, {
      center: [32.897, -97.038],
      zoom: 7,
      minZoom: 4,
      maxZoom: 10
    })

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

    this.scoreOverlay = null
    this.scores = []
    this.detailPopup = L.popup({ maxWidth: 340 })

    this.colorScale = [
      { min: 80, r: 0, g: 255, b: 163 },
      { min: 65, r: 125, g: 255, b: 212 },
      { min: 50, r: 255, g: 229, b: 102 },
      { min: 33, r: 255, g: 144, b: 68 },
      { min: 0,  r: 255, g: 79,  b: 79 }
    ]

    // Render pre-loaded scores immediately (no round-trip needed)
    const initialScores = JSON.parse(this.el.dataset.scores || "[]")
    if (initialScores.length > 0) {
      this.renderScores(initialScores)
    }

    this.handleEvent("update_scores", ({ scores }) => {
      topbar.hide()
      this.renderScores(scores)
    })

    this.bandInfo = JSON.parse(this.el.dataset.bandInfo || "{}")
    this.rangeCircles = L.layerGroup().addTo(this.map)

    this.handleEvent("update_band_info", ({ band_info }) => {
      this.bandInfo = band_info
    })

    // Prevent control panel from eating map clicks/scrolls
    const controls = document.getElementById("map-controls")
    if (controls) {
      L.DomEvent.disableClickPropagation(controls)
      L.DomEvent.disableScrollPropagation(controls)
    }

    // Grid overlay layer
    this.gridLayer = L.layerGroup()
    this.gridVisible = false

    // Listen for grid toggle from LiveView
    this.handleEvent("toggle_grid", ({ visible }) => {
      this.gridVisible = visible
      if (visible) {
        this.gridLayer.addTo(this.map)
        updateGridOverlay(this.map, this.gridLayer)
      } else {
        this.gridLayer.remove()
      }
    })

    // Click on map to show factor breakdown + range circle
    this.map.on("click", (e) => {
      const detail = this.lookupPoint(e.latlng.lat, e.latlng.lng)
      if (detail) {
        this.showRangeCircles(detail)
        this.detailPopup
          .setLatLng([detail.lat, detail.lon])
          .setContent(buildPopupHTML(detail))
          .openOn(this.map)
      }
    })

    this.map.on("popupclose", () => this.rangeCircles.clearLayers())

    // Close popup on double-click so zoom works through it
    this.map.on("dblclick", () => this.map.closePopup())

    this.el.addEventListener("show-loading", () => topbar.show(300))

    this.sendBounds()
    this.map.on("moveend", () => {
      this.sendBounds()
      if (this.gridVisible) {
        updateGridOverlay(this.map, this.gridLayer)
      }
    })

    // Legend
    const legend = L.control({ position: "bottomright" })
    legend.onAdd = () => {
      const div = L.DomUtil.create("div")
      div.style.cssText = "background:#fff;color:#333;padding:10px 14px;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,0.3);font-size:13px;line-height:2;"
      const rows = [
        ["#00ffa3", "Excellent (80-100)"],
        ["#7dffd4", "Good (65-79)"],
        ["#ffe566", "Marginal (50-64)"],
        ["#ff9044", "Poor (33-49)"],
        ["#ff4f4f", "Negligible (0-32)"]
      ]
      div.innerHTML = "<strong style='color:#333;'>Propagation</strong><br>" +
        rows.map(([c, label]) =>
          `<span style="background:${c};width:14px;height:14px;display:inline-block;border-radius:50%;vertical-align:middle;margin-right:6px;border:1px solid rgba(0,0,0,0.15);"></span><span style="color:#333;">${label}</span>`
        ).join("<br>")
      return div
    }
    legend.addTo(this.map)
  },

  renderScores(scores) {
    this.scores = scores
    if (this.scoreOverlay) {
      this.map.removeLayer(this.scoreOverlay)
    }
    if (scores.length === 0) return

    this.gridLookup = new Map()
    this.gridData = new Map()
    scores.forEach((s) => {
      const key = `${s.lat.toFixed(3)},${s.lon.toFixed(3)}`
      this.gridLookup.set(key, s.score)
      this.gridData.set(key, s)
    })

    const self = this
    this.scoreOverlay = L.GridLayer.extend({
      createTile(coords) {
        const tile = document.createElement("canvas")
        const size = this.getTileSize()
        tile.width = size.x
        tile.height = size.y
        const ctx = tile.getContext("2d")

        const step = 0.125
        const nwPoint = coords.scaleBy(size)
        const nw = this._map.unproject(nwPoint, coords.z)
        const se = this._map.unproject(nwPoint.add(size), coords.z)

        const latPerPx = (nw.lat - se.lat) / size.y
        const lonPerPx = (se.lng - nw.lng) / size.x
        const cellPxX = Math.max(1, Math.ceil(step / lonPerPx))
        const cellPxY = Math.max(1, Math.ceil(step / Math.abs(latPerPx)))

        for (let py = 0; py < size.y; py += cellPxY) {
          for (let px = 0; px < size.x; px += cellPxX) {
            const lat = nw.lat - py * Math.abs(latPerPx)
            const lon = nw.lng + px * lonPerPx
            const score = self.interpolateScore(lat, lon, step)
            if (score !== null) {
              const color = self.scoreColorRGB(score)
              ctx.fillStyle = `rgba(${color.r},${color.g},${color.b},0.55)`
              ctx.fillRect(px, py, cellPxX, cellPxY)
            }
          }
        }
        return tile
      }
    })

    this.scoreOverlay = new (this.scoreOverlay)({ opacity: 1.0 })
    this.scoreOverlay.addTo(this.map)
  },

  interpolateScore(lat, lon, step) {
    const rlat = (Math.round(lat / step) * step).toFixed(3)
    const rlon = (Math.round(lon / step) * step).toFixed(3)
    if (this.gridLookup.has(`${rlat},${rlon}`)) return this.gridLookup.get(`${rlat},${rlon}`)

    const lat0 = Math.floor(lat / step) * step
    const lat1 = lat0 + step
    const lon0 = Math.floor(lon / step) * step
    const lon1 = lon0 + step

    const s00 = this.gridLookup.get(`${lat0.toFixed(3)},${lon0.toFixed(3)}`)
    const s10 = this.gridLookup.get(`${lat1.toFixed(3)},${lon0.toFixed(3)}`)
    const s01 = this.gridLookup.get(`${lat0.toFixed(3)},${lon1.toFixed(3)}`)
    const s11 = this.gridLookup.get(`${lat1.toFixed(3)},${lon1.toFixed(3)}`)

    const corners = [s00, s10, s01, s11].filter(s => s !== undefined)
    if (corners.length < 2) return null

    if (corners.length === 4) {
      const tLat = (lat - lat0) / step
      const tLon = (lon - lon0) / step
      return Math.round(
        s00 * (1 - tLat) * (1 - tLon) + s10 * tLat * (1 - tLon) +
        s01 * (1 - tLat) * tLon + s11 * tLat * tLon
      )
    }
    return Math.round(corners.reduce((a, b) => a + b, 0) / corners.length)
  },

  scoreColorRGB(score) {
    for (let i = 0; i < this.colorScale.length - 1; i++) {
      const upper = this.colorScale[i]
      const lower = this.colorScale[i + 1]
      if (score >= lower.min) {
        const range = upper.min - lower.min
        const t = Math.min(1, (score - lower.min) / range)
        return {
          r: Math.round(lower.r + (upper.r - lower.r) * t),
          g: Math.round(lower.g + (upper.g - lower.g) * t),
          b: Math.round(lower.b + (upper.b - lower.b) * t)
        }
      }
    }
    const last = this.colorScale[this.colorScale.length - 1]
    return { r: last.r, g: last.g, b: last.b }
  },

  lookupPoint(lat, lon) {
    if (!this.gridData) return null
    const step = 0.125
    const rlat = (Math.round(lat / step) * step).toFixed(3)
    const rlon = (Math.round(lon / step) * step).toFixed(3)
    const data = this.gridData.get(`${rlat},${rlon}`)
    if (!data) return null
    return { ...data, ...this.bandInfo }
  },

  showRangeCircles(detail) {
    this.rangeCircles.clearLayers()
    const center = [detail.lat, detail.lon]
    const score = detail.score
    const tier = scoreTier(score)

    let rangeKm
    if (score >= 80) rangeKm = detail.exceptional_range_km
    else if (score >= 65) rangeKm = detail.extended_range_km
    else if (score >= 50) rangeKm = detail.typical_range_km
    else if (score >= 33) rangeKm = Math.round(detail.typical_range_km * 0.6)
    else rangeKm = Math.round(detail.typical_range_km * 0.3)

    const typicalKm = detail.typical_range_km

    L.circle(center, {
      radius: rangeKm * 1000,
      color: "#222",
      weight: 3,
      opacity: 0.9,
      fillColor: "#000",
      fillOpacity: 0.2,
      dashArray: "8,6",
      interactive: false
    }).addTo(this.rangeCircles)

    if (typicalKm < rangeKm) {
      L.circle(center, {
        radius: typicalKm * 1000,
        color: "#222",
        weight: 3,
        opacity: 0.9,
        fillColor: "#000",
        fillOpacity: 0.25,
        interactive: false
      }).addTo(this.rangeCircles)
    }

    L.circleMarker(center, {
      radius: 6,
      color: "#fff",
      weight: 2,
      fillColor: tier.color,
      fillOpacity: 1,
      interactive: false
    }).addTo(this.rangeCircles)
  },

  sendBounds() {
    topbar.show()
    const b = this.map.getBounds()
    this.pushEvent("map_bounds", {
      south: b.getSouth(),
      north: b.getNorth(),
      west: b.getWest(),
      east: b.getEast()
    })
  },

  destroyed() {
    if (this.map) this.map.remove()
  }
}