/* =========================================================
   public-map.js — Peta Publik SKPL
   Choropleth (KF-06) + Heatmap (KF-08) + Layer switcher (KF-09)
   + Legenda + Pencarian wilayah (KF-11).
   `map` & `APP_BASE` disediakan global oleh peta_publik.php.
   ========================================================= */
(function () {
    const API = APP_BASE + '/api';

    let choroplethLayer = null;
    let heatLayer = null;
    let wilayahFeatures = [];

    // ---- Skala warna persentase kemiskinan ----
    function colorFor(persen) {
        return persen >= 10 ? '#EF4444'   // merah  — tinggi
            : persen >= 5  ? '#FB923C'    // oranye — sedang-tinggi
            : persen >= 2  ? '#FBBF24'    // kuning — sedang
            : persen > 0   ? '#A3E635'    // hijau muda — rendah
            : '#2ECC71';                  // hijau  — tanpa kasus
    }

    function styleWilayah(feature) {
        const p = feature.properties.persentase_miskin || 0;
        return {
            fillColor: colorFor(p),
            fillOpacity: 0.55,
            color: '#374151',
            weight: 1.5,
        };
    }

    function popupWilayah(props) {
        return `<div style="font-weight:700;margin-bottom:6px;">${props.nama}</div>
            <div style="font-size:0.85rem;line-height:1.6;">
                Penduduk: <strong>${props.jumlah_penduduk}</strong><br>
                Warga miskin: <strong>${props.jumlah_miskin}</strong><br>
                Persentase: <strong>${props.persentase_miskin}%</strong>
            </div>`;
    }

    // ---- Choropleth (KF-06) ----
    async function loadChoropleth() {
        const r = await fetch(`${API}/wilayah.php`);
        const j = await r.json();
        const data = j.status === 'success' ? j.data : { type: 'FeatureCollection', features: [] };
        wilayahFeatures = data.features || [];

        choroplethLayer = L.geoJSON(data, {
            style: styleWilayah,
            onEachFeature: (f, layer) => {
                layer.bindPopup(popupWilayah(f.properties));
                layer.bindTooltip(f.properties.nama, { sticky: true });
            },
        }).addTo(map);

        if (wilayahFeatures.length) {
            map.fitBounds(choroplethLayer.getBounds(), { padding: [40, 40] });
        }
        return choroplethLayer;
    }

    // ---- Heatmap (KF-08) ----
    async function loadHeatmap() {
        const r = await fetch(`${API}/heatmap.php`);
        const j = await r.json();
        const points = j.status === 'success' ? j.data : [];
        heatLayer = L.heatLayer(points, {
            radius: 30, blur: 22, maxZoom: 17,
            gradient: { 0.2: '#3B82F6', 0.5: '#FBBF24', 0.9: '#EF4444' },
        });
        return heatLayer;
    }

    // ---- Legenda (KF-06) ----
    function addLegend() {
        const legend = L.control({ position: 'bottomleft' });
        legend.onAdd = function () {
            const div = L.DomUtil.create('div', 'legend');
            const grades = [
                { c: '#2ECC71', t: 'Tidak ada kasus' },
                { c: '#A3E635', t: '< 2% miskin' },
                { c: '#FBBF24', t: '2 – 5%' },
                { c: '#FB923C', t: '5 – 10%' },
                { c: '#EF4444', t: '> 10% (prioritas)' },
            ];
            div.innerHTML = '<h4>Tingkat Kemiskinan</h4>' +
                grades.map(g => `<div><i style="background:${g.c}"></i>${g.t}</div>`).join('');
            return div;
        };
        legend.addTo(map);
    }

    // ---- Pencarian wilayah (KF-11) ----
    function addSearch() {
        const ctrl = L.control({ position: 'topright' });
        ctrl.onAdd = function () {
            const div = L.DomUtil.create('div', 'map-search');
            div.innerHTML = `<input type="text" id="searchWilayah" placeholder="🔍 Cari kelurahan..." autocomplete="off">
                <div id="searchResults" class="search-results"></div>`;
            L.DomEvent.disableClickPropagation(div);
            return div;
        };
        ctrl.addTo(map);

        const input = document.getElementById('searchWilayah');
        const results = document.getElementById('searchResults');

        input.addEventListener('input', function () {
            const q = this.value.toLowerCase().trim();
            results.innerHTML = '';
            if (!q) return;
            wilayahFeatures
                .filter(f => f.properties.nama.toLowerCase().includes(q))
                .slice(0, 6)
                .forEach(f => {
                    const item = document.createElement('div');
                    item.className = 'search-item';
                    item.textContent = f.properties.nama;
                    item.onclick = () => {
                        const layer = L.geoJSON(f);
                        map.fitBounds(layer.getBounds(), { padding: [60, 60] });
                        results.innerHTML = '';
                        input.value = f.properties.nama;
                    };
                    results.appendChild(item);
                });
        });
    }

    // ---- Inisialisasi ----
    Promise.all([loadChoropleth(), loadHeatmap()]).then(([choro, heat]) => {
        // Layer switcher (KF-09)
        L.control.layers(null, {
            'Batas Kelurahan (Choropleth)': choro,
            'Heatmap Kepadatan': heat,
        }, { collapsed: false, position: 'topright' }).addTo(map);
        addLegend();
        addSearch();
    });
})();