/* =========================================================
   skpl-layers.js — Layer SKPL reusable untuk peta login.
   Choropleth kelurahan (KF-06) + Heatmap (KF-08) + legenda +
   layer switcher overlay (KF-09) + pencarian wilayah (KF-11).

   Pakai: panggil attachSkplLayers(map) setelah map dibuat.
   Butuh leaflet.heat sudah dimuat di halaman.
   ========================================================= */
(function () {
    function injectStyle() {
        if (document.getElementById('skpl-layer-style')) return;
        const css = `
        .skpl-legend{background:#fff;padding:10px 12px;border-radius:10px;box-shadow:0 2px 10px rgba(0,0,0,.15);font-size:.76rem;line-height:1.6}
        .skpl-legend h4{font-size:.78rem;margin:0 0 6px}
        .skpl-legend i{display:inline-block;width:13px;height:13px;border-radius:3px;margin-right:6px;vertical-align:middle}
        .skpl-search{background:#fff;border-radius:10px;box-shadow:0 2px 10px rgba(0,0,0,.15);padding:6px;width:220px}
        .skpl-search input{width:100%;border:1px solid #E5E7EB;border-radius:7px;padding:7px 9px;font-size:.83rem;outline:none}
        .skpl-search input:focus{border-color:#2563EB}
        .skpl-results .item{padding:7px 9px;font-size:.82rem;cursor:pointer;border-radius:6px}
        .skpl-results .item:hover{background:#EFF6FF;color:#1D4ED8}`;
        const s = document.createElement('style');
        s.id = 'skpl-layer-style';
        s.textContent = css;
        document.head.appendChild(s);
    }

    function colorFor(p) {
        return p >= 10 ? '#EF4444' : p >= 5 ? '#FB923C' : p >= 2 ? '#FBBF24' : p > 0 ? '#A3E635' : '#2ECC71';
    }

    window.attachSkplLayers = async function (map) {
        if (!map || typeof L === 'undefined') return;
        injectStyle();
        const API = (typeof APP_BASE !== 'undefined' ? APP_BASE : '') + '/api';
        let features = [];

        // Choropleth
        let choro = null;
        try {
            const j = await (await fetch(`${API}/wilayah.php`)).json();
            const data = j.status === 'success' ? j.data : { type: 'FeatureCollection', features: [] };
            features = data.features || [];
            choro = L.geoJSON(data, {
                style: f => ({
                    fillColor: colorFor(f.properties.persentase_miskin || 0),
                    fillOpacity: 0.5, color: '#374151', weight: 1.5,
                }),
                onEachFeature: (f, layer) => {
                    const p = f.properties;
                    layer.bindPopup(`<div style="font-weight:700;margin-bottom:6px;">${p.nama}</div>
                        <div style="font-size:.85rem;line-height:1.6;">
                        Penduduk: <strong>${p.jumlah_penduduk}</strong><br>
                        Warga miskin: <strong>${p.jumlah_miskin}</strong><br>
                        Persentase: <strong>${p.persentase_miskin}%</strong></div>`);
                    layer.bindTooltip(p.nama, { sticky: true });
                },
            });
        } catch (e) { /* abaikan */ }

        // Heatmap
        let heat = null;
        try {
            const j = await (await fetch(`${API}/heatmap.php`)).json();
            const pts = j.status === 'success' ? j.data : [];
            if (L.heatLayer) {
                heat = L.heatLayer(pts, {
                    radius: 30, blur: 22, maxZoom: 17,
                    gradient: { 0.2: '#3B82F6', 0.5: '#FBBF24', 0.9: '#EF4444' },
                });
            }
        } catch (e) { /* abaikan */ }

        // Layer switcher overlay
        const overlays = {};
        if (choro) overlays['🗺️ Choropleth Kelurahan'] = choro;
        if (heat)  overlays['🔥 Heatmap Kepadatan'] = heat;
        if (Object.keys(overlays).length) {
            L.control.layers(null, overlays, { collapsed: true, position: 'topright' }).addTo(map);
        }

        // Legenda
        const legend = L.control({ position: 'bottomleft' });
        legend.onAdd = function () {
            const div = L.DomUtil.create('div', 'skpl-legend');
            const g = [
                ['#2ECC71', 'Tidak ada kasus'], ['#A3E635', '< 2%'],
                ['#FBBF24', '2 – 5%'], ['#FB923C', '5 – 10%'], ['#EF4444', '> 10% (prioritas)'],
            ];
            div.innerHTML = '<h4>Tingkat Kemiskinan</h4>' +
                g.map(x => `<div><i style="background:${x[0]}"></i>${x[1]}</div>`).join('');
            return div;
        };
        legend.addTo(map);

        // Pencarian wilayah (KF-11)
        const search = L.control({ position: 'topright' });
        search.onAdd = function () {
            const div = L.DomUtil.create('div', 'skpl-search');
            div.innerHTML = `<input type="text" placeholder="🔍 Cari kelurahan...">
                <div class="skpl-results"></div>`;
            L.DomEvent.disableClickPropagation(div);
            return div;
        };
        search.addTo(map);
        const root = document.querySelector('.skpl-search');
        if (root) {
            const input = root.querySelector('input');
            const res = root.querySelector('.skpl-results');
            input.addEventListener('input', function () {
                const q = this.value.toLowerCase().trim();
                res.innerHTML = '';
                if (!q) return;
                features.filter(f => f.properties.nama.toLowerCase().includes(q)).slice(0, 6).forEach(f => {
                    const it = document.createElement('div');
                    it.className = 'item';
                    it.textContent = f.properties.nama;
                    it.onclick = () => {
                        map.fitBounds(L.geoJSON(f).getBounds(), { padding: [60, 60] });
                        res.innerHTML = '';
                        input.value = f.properties.nama;
                    };
                    res.appendChild(it);
                });
            });
        }
    };
})();