/**
 * Overpass UI: Query-Editor-Panel mit Template-Browser und BBox-Integration.
 */
const OverpassUI = {
    _panel: null,
    _editor: null,
    _templates: [],
    _categories: [],
    _activeCategory: null,
    _isLoading: false,
    _useBbox: true,

    init: function() {
        this._createPanel();
        this._loadTemplates();
    },

    show: function() {
        if (!this._panel) this.init();
        this._panel.style.display = 'block';
        if (!OverpassLayer._points) OverpassLayer.start(Globe.viewer);
    },

    hide: function() {
        if (this._panel) this._panel.style.display = 'none';
    },

    _createPanel: function() {
        var panel = document.getElementById('overpass-panel');
        if (!panel) return;
        this._panel = panel;

        panel.innerHTML =
            '<div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:12px">' +
                '<div style="font-size:11px;font-weight:700;letter-spacing:2px;color:var(--accent)">OVERPASS QUERY</div>' +
                '<button onclick="OverpassUI.hide();var cb=document.getElementById(\'layer-overpass\');if(cb){cb.checked=false;}OverpassLayer.stop();" ' +
                    'style="background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:18px;line-height:1" title="Schliessen">&times;</button>' +
            '</div>' +
            '<div id="overpass-cat-tabs" class="overpass-cat-tabs"></div>' +
            '<div id="overpass-template-list" style="max-height:160px;overflow-y:auto;margin-bottom:10px"></div>' +
            '<div class="panel-divider"></div>' +
            '<div style="font-size:9px;letter-spacing:1.5px;color:var(--text-dim);margin-bottom:4px">OVERPASSQL EDITOR</div>' +
            '<textarea id="overpass-editor" rows="6" spellcheck="false" placeholder="[out:json][timeout:25];\n(\n  node[&quot;amenity&quot;]({{bbox}});\n);\nout center body;"></textarea>' +
            '<div style="display:flex;align-items:center;gap:8px;margin:10px 0">' +
                '<label style="display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text);cursor:pointer;flex:1">' +
                    '<input type="checkbox" id="overpass-bbox" checked onchange="OverpassUI._useBbox=this.checked" style="accent-color:var(--accent);width:14px;height:14px">' +
                    'Viewport als BBox' +
                '</label>' +
            '</div>' +
            '<button class="overpass-exec-btn" id="overpass-exec-btn" onclick="OverpassUI._executeQuery()">AUSFUEHREN</button>' +
            '<div id="overpass-result" style="margin-top:10px;font-size:11px;color:var(--text-dim);display:none"></div>' +
            '<button id="overpass-clear-btn" onclick="OverpassUI._clearResults()" ' +
                'style="display:none;width:100%;padding:6px;margin-top:6px;background:none;border:1px solid var(--border);color:var(--text-dim);' +
                'font-family:var(--font-mono);font-size:11px;border-radius:4px;cursor:pointer;letter-spacing:1px">ERGEBNISSE LOESCHEN</button>';

        this._editor = document.getElementById('overpass-editor');
    },

    _loadTemplates: function() {
        var self = this;
        fetch('/api/overpass/templates')
        .then(function(r) { return r.json(); })
        .then(function(data) {
            self._categories = data.categories || [];
            if (self._categories.length > 0) {
                self._activeCategory = self._categories[0].id;
                self._renderCategoryTabs();
                self._renderTemplateList();
            }
        })
        .catch(function(e) { console.warn('Overpass Templates:', e); });
    },

    _renderCategoryTabs: function() {
        var el = document.getElementById('overpass-cat-tabs');
        if (!el) return;
        var self = this;
        var html = '';
        this._categories.forEach(function(cat) {
            var active = cat.id === self._activeCategory ? ' active' : '';
            html += '<button class="overpass-cat-tab' + active + '" data-cat="' + cat.id + '" ' +
                'onclick="OverpassUI._selectCategory(\'' + cat.id + '\')">' + cat.label + '</button>';
        });
        el.innerHTML = html;
    },

    _selectCategory: function(catId) {
        this._activeCategory = catId;
        this._renderCategoryTabs();
        this._renderTemplateList();
    },

    _renderTemplateList: function() {
        var el = document.getElementById('overpass-template-list');
        if (!el) return;
        var self = this;
        var cat = this._categories.find(function(c) { return c.id === self._activeCategory; });
        if (!cat) { el.innerHTML = ''; return; }

        var html = '';
        cat.templates.forEach(function(t) {
            html += '<button class="overpass-template-btn" onclick="OverpassUI._applyTemplate(\'' + t.id + '\')" title="' + t.description + '">' +
                '<span style="display:inline-block;width:8px;height:8px;border-radius:50%;background:' + t.color + ';margin-right:8px"></span>' +
                t.name + '</button>';
        });
        el.innerHTML = html;
    },

    _applyTemplate: function(templateId) {
        var tpl = null;
        for (var i = 0; i < this._categories.length; i++) {
            var found = this._categories[i].templates.find(function(t) { return t.id === templateId; });
            if (found) { tpl = found; break; }
        }
        if (tpl && this._editor) {
            this._editor.value = tpl.query;
            OverpassLayer.setColor(tpl.color);
        }
    },

    _getBboxFromViewport: function() {
        if (!Globe.viewer) return null;
        var rect = Globe.viewer.camera.computeViewRectangle();
        if (!rect) return null;
        return [
            Cesium.Math.toDegrees(rect.south),
            Cesium.Math.toDegrees(rect.west),
            Cesium.Math.toDegrees(rect.north),
            Cesium.Math.toDegrees(rect.east),
        ];
    },

    _executeQuery: function() {
        if (this._isLoading || !this._editor) return;
        var query = this._editor.value.trim();
        if (!query) return;

        var bbox = null;
        if (this._useBbox) {
            bbox = this._getBboxFromViewport();
        }

        this._isLoading = true;
        var btn = document.getElementById('overpass-exec-btn');
        if (btn) { btn.disabled = true; btn.textContent = 'LADE...'; }
        var resultEl = document.getElementById('overpass-result');
        if (resultEl) { resultEl.style.display = 'block'; resultEl.textContent = 'Anfrage wird gesendet...'; resultEl.style.color = 'var(--text-dim)'; }
        var startTime = Date.now();

        var self = this;
        fetch('/api/overpass/query', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ query: query, bbox: bbox }),
        })
        .then(function(r) {
            if (r.status === 429) {
                return r.json().then(function(d) { throw new Error(d.detail || 'Rate-Limit erreicht'); });
            }
            if (!r.ok) {
                return r.json().then(function(d) { throw new Error(d.detail || 'Fehler ' + r.status); });
            }
            return r.json();
        })
        .then(function(data) {
            var elapsed = ((Date.now() - startTime) / 1000).toFixed(1);
            OverpassLayer.render(data);
            if (resultEl) {
                var text = data.total + ' Objekte (' + elapsed + 's)';
                if (data.cached) text += ' [Cache]';
                if (data.truncated) text += ' [max. ' + data.total + ' angezeigt]';
                resultEl.textContent = text;
                resultEl.style.color = 'var(--accent)';
            }
            var clearBtn = document.getElementById('overpass-clear-btn');
            if (clearBtn) clearBtn.style.display = 'block';
        })
        .catch(function(e) {
            if (resultEl) {
                resultEl.textContent = 'Fehler: ' + e.message;
                resultEl.style.color = '#ff5252';
            }
        })
        .finally(function() {
            self._isLoading = false;
            if (btn) { btn.disabled = false; btn.textContent = 'AUSFUEHREN'; }
        });
    },

    _clearResults: function() {
        OverpassLayer.clear();
        var resultEl = document.getElementById('overpass-result');
        if (resultEl) { resultEl.style.display = 'none'; resultEl.style.color = 'var(--text-dim)'; }
        var clearBtn = document.getElementById('overpass-clear-btn');
        if (clearBtn) clearBtn.style.display = 'none';
    },

    executeQueryDirect: function(query, bbox, color) {
        if (this._editor) this._editor.value = query;
        if (color) OverpassLayer.setColor(color);
        this._useBbox = !!bbox;
        var bboxCb = document.getElementById('overpass-bbox');
        if (bboxCb) bboxCb.checked = this._useBbox;
        this.show();
        this._executeQuery();
    },
};