<template>
	<div class="space-y-2">
		<button
			class="flex items-center gap-2 text-sm font-bold text-accent hover:text-accent-content transition-colors"
			@click="toggleMap"
		>
			<iconify-icon :icon="isOpen ? 'lucide:chevron-up' : 'lucide:chevron-down'"></iconify-icon>
			{{ isOpen ? 'Hide map' : 'Show map' }}
		</button>

		<template v-if="isOpen">
			<div
				ref="mapContainer"
				class="w-full h-72 rounded-2xl overflow-hidden border border-zinc-300 shadow-sm"
			></div>

			<div class="flex flex-wrap gap-3 text-xs text-zinc-500">
                <span class="flex items-center gap-1.5">
                    <span class="inline-block size-3 rounded-full bg-green-500"></span>
                    Current (&lt;24h)
                </span>
				<span class="flex items-center gap-1.5">
                    <span class="inline-block size-3 rounded-full bg-slate-500"></span>
                    Recent (24–48h)
                </span>
				<span class="flex items-center gap-1.5">
                    <span class="inline-block size-3 rounded-full bg-amber-500"></span>
                    Stale (2–5 days)
                </span>
				<span class="flex items-center gap-1.5">
                    <span class="inline-block size-3 rounded-full bg-red-500"></span>
                    Outdated (5+ days)
                </span>
			</div>
		</template>
	</div>
</template>

<script setup>
import {ref, watch, onMounted, onUnmounted, nextTick} from 'vue'
import L from 'leaflet'
import 'leaflet/dist/leaflet.css'

const CLASSIFICATION_COLOURS = {
	current: '#22c55e',
	recent: '#64748b',
	stale: '#f59e0b',
	outdated: '#ef4444',
}

const CLASSIFICATION_BORDER_COLOURS = {
	current: '#16a34a',
	recent: '#475569',
	stale: '#d97706',
	outdated: '#dc2626',
}

function buildDirectionsUrl(station, origin) {
	const base = `https://www.google.com/maps/dir/?api=1&destination=${station.lat},${station.lng}`
	if (origin?.lat != null && origin?.lng != null) {
		return `${base}&origin=${origin.lat},${origin.lng}`
	}
	return base
}

function buildMarkerHtml(station, index, colour, borderColour, origin) {
	const isFirst = index === 0
	const h = isFirst ? 20 : 18
	const fontSize = isFirst ? 11 : 10
	const iconSize = isFirst ? 11 : 10
	const star = isFirst
		? `<span style="margin-right:2px;color:#facc15;font-size:10px;line-height:1;">★</span>`
		: ''

	const directionsUrl = escHtml(buildDirectionsUrl(station, origin))
	const navSvg = `<svg xmlns="http://www.w3.org/2000/svg" width="${iconSize}" height="${iconSize}" viewBox="0 0 24 24" fill="currentColor" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><polygon points="3 11 22 2 13 21 11 13 3 11"/></svg>`

	return `<div style="display:inline-flex;align-items:center;height:${h}px;padding:0 4px 0 6px;background:${colour};color:#fff;font-weight:700;font-size:${fontSize}px;line-height:1;letter-spacing:-0.2px;border-radius:10px;border:1.5px solid ${borderColour};box-shadow:0 1px 3px rgba(0,0,0,0.25);white-space:nowrap;gap:3px;">
        ${star}<span>${Number(station.price).toFixed(1)}</span><a data-directions href="${directionsUrl}" target="_blank" rel="noopener" aria-label="Directions" style="display:inline-flex;align-items:center;justify-content:center;width:${h - 6}px;height:${h - 6}px;margin-left:1px;border-radius:50%;background:rgba(255,255,255,0.22);color:#fff;text-decoration:none;">${navSvg}</a>
    </div>`
}

function escHtml(str) {
	return String(str ?? '')
		.replace(/&/g, '&amp;')
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;')
		.replace(/"/g, '&quot;')
}

const props = defineProps({
	stations: {type: Array, required: true},
	defaultOpen: {type: Boolean, default: false},
	radiusMiles: {type: Number, default: 10},
	origin: {type: Object, default: null},
})

const mapContainer = ref(null)
const isOpen = ref(false)
let mapInstance = null
let markersLayer = null
let userMarker = null

function getZoomForRadius(radiusMiles) {
	if (radiusMiles <= 1) return 16
	if (radiusMiles <= 2) return 15
	if (radiusMiles <= 5) return 14
	if (radiusMiles <= 10) return 13
	if (radiusMiles <= 15) return 11
	if (radiusMiles <= 25) return 10
	if (radiusMiles <= 50) return 9
	return 8
}


function addUserMarker(lat, lng) {
	if (userMarker) {
		userMarker.remove()
	}

	const pulseHtml =
		'<div class="absolute w-full h-full bg-blue-500/30 rounded-full animate-ping"></div>'
	;

	const icon = L.divIcon({
		html: `
                    <div class="relative w-10 h-10 flex items-center justify-center">
                        ${pulseHtml}
                        <div class="relative w-4 h-4 bg-blue-600 border-2 border-white rounded-full shadow-lg"></div>
                    </div>
                `,
		className: 'user-location-div-icon',
		iconSize: [40, 40],
		iconAnchor: [20, 20]
	})

	userMarker = L.marker([lat, lng], {icon, zIndexOffset: -100})
		.bindPopup('Your location')
		.addTo(mapInstance)
}

function locateUser() {
	if (!navigator.geolocation) return

	const ipFallback = () => {
		fetch('https://ipapi.co/json/')
			.then(r => r.json())
			.then(d => d.latitude && d.longitude && addUserMarker(d.latitude, d.longitude))
			.catch(() => {
			})
	}

	navigator.geolocation.getCurrentPosition(
		pos => {
			addUserMarker(pos.coords.latitude, pos.coords.longitude)

			navigator.geolocation.getCurrentPosition(
				precise => addUserMarker(precise.coords.latitude, precise.coords.longitude),
				() => {
				},
				{enableHighAccuracy: true, timeout: 10000, maximumAge: 0},
			)
		},
		() => ipFallback(),
		{enableHighAccuracy: false, timeout: 5000, maximumAge: 60000},
	)
}

function initMap() {
	if (mapInstance || !mapContainer.value) return

	mapInstance = L.map(mapContainer.value)

	L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
		attribution: '© OpenStreetMap contributors',
	}).addTo(mapInstance)

	markersLayer = L.layerGroup().addTo(mapInstance)

	locateUser()
}

function renderMarkers() {
	if (!mapInstance || !markersLayer) return

	markersLayer.clearLayers()

	if (!props.stations.length) return

	const bounds = []

	props.stations.forEach((station, index) => {
		const colour = CLASSIFICATION_COLOURS[station.price_classification] ?? '#64748b'
		const borderColour = CLASSIFICATION_BORDER_COLOURS[station.price_classification] ?? '#475569'
		const miles = ((station.distance_km ?? 0) * 0.621371).toFixed(1)
		const supermarketTag = station.is_supermarket
			? '<span style="display:inline-block;background:#84cc16;color:#fff;font-size:10px;padding:1px 5px;border-radius:3px;margin-left:4px;">Supermarket</span>'
			: ''

		const popup = `
            <div style="min-width:160px">
                <strong style="font-size:13px">${escHtml(station.name)}</strong>${supermarketTag}<br>
                <span style="font-size:20px;font-weight:700;color:${escHtml(colour)}">${Number(station.price).toFixed(1)}p</span><br>
                <span style="font-size:12px;color:#6b7280">${escHtml(miles)} miles away</span><br>
                <span style="font-size:11px;color:#9ca3af">${escHtml(station.address)}, ${escHtml(station.postcode)}</span>
            </div>
        `

		const isFirst = index === 0
		const w = isFirst ? 65 : 56
		const h = isFirst ? 20 : 18

		const icon = L.divIcon({
			className: '',
			iconSize: [w, h],
			iconAnchor: [w / 2, h / 2],
			html: buildMarkerHtml(station, index, colour, borderColour, props.origin),
		})

		const marker = L.marker([station.lat, station.lng], {icon}).bindPopup(popup)

		marker.on('click', () => {
			const target = Math.max(mapInstance.getZoom(), 16)
			mapInstance.setView([station.lat, station.lng], target, {animate: true})
		})

		markersLayer.addLayer(marker)
		bounds.push([station.lat, station.lng])
	})

	const zoom = getZoomForRadius(props.radiusMiles)

	if (bounds.length === 1) {
		mapInstance.setView(bounds[0], zoom)
	} else {
		mapInstance.fitBounds(bounds, {padding: [40, 40], maxZoom: zoom})
	}
}

async function toggleMap() {
	isOpen.value = !isOpen.value

	if (isOpen.value) {
		await nextTick()
		initMap()
		mapInstance.invalidateSize()
		renderMarkers()
	}
}

onMounted(async () => {
	if (props.defaultOpen) {
		isOpen.value = true
		await nextTick()
		initMap()
		mapInstance.invalidateSize()
		renderMarkers()
	}
})

watch(() => props.stations, () => {
	if (isOpen.value) {
		renderMarkers()
	}
})

onUnmounted(() => {
	if (mapInstance) {
		mapInstance.remove()
		mapInstance = null
	}
})
</script>

<style>
.fuelalert-user-marker {
	position: relative;
	width: 16px;
	height: 16px;
}

.fuelalert-user-dot {
	position: absolute;
	inset: 3px;
	background: #3b82f6;
	border-radius: 50%;
	border: 2px solid #fff;
	box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.fuelalert-user-ring {
	position: absolute;
	inset: 0;
	border-radius: 50%;
	background: rgba(59, 130, 246, 0.25);
	animation: fuelalert-pulse 2s ease-out infinite;
}

@keyframes fuelalert-pulse {
	0% {
		transform: scale(1);
		opacity: 0.8;
	}
	100% {
		transform: scale(3);
		opacity: 0;
	}
}
</style>
