/**
 * pos-utils.js — Shared utility functions for all POS pages.
 *
 * Provides common operations that multiple pages need:
 *   - CSV export of any visible table
 *   - Print page (PDF via browser print dialog)
 *   - Toast notifications (if page doesn't have its own)
 *
 * Load this script in every POS template BEFORE page-specific JS.
 */
(function() {
    'use strict';

    // ── CSV Export ──────────────────────────────────────────────────
    // Finds the first visible <table> on the page and downloads it as CSV.
    // Works on inventory, customers, invoicing, reports, accounting.

    window.exportVisibleTableCSV = function(prefix) {
        prefix = prefix || 'datos';
        var tables = document.querySelectorAll('table');
        var table = null;

        // Find first visible table with data rows
        for (var i = 0; i < tables.length; i++) {
            if (tables[i].offsetParent !== null && tables[i].querySelector('tbody tr')) {
                table = tables[i];
                break;
            }
        }

        if (!table) {
            showToast('No hay tabla de datos para exportar en esta vista.', 'warn');
            return;
        }

        var rows = [];

        // Header row
        var ths = table.querySelectorAll('thead th');
        if (ths.length) {
            rows.push(Array.from(ths).map(function(th) {
                return '"' + th.textContent.trim().replace(/"/g, '""') + '"';
            }).join(','));
        }

        // Data rows
        table.querySelectorAll('tbody tr').forEach(function(tr) {
            var cells = tr.querySelectorAll('td');
            rows.push(Array.from(cells).map(function(td) {
                return '"' + td.textContent.trim().replace(/"/g, '""') + '"';
            }).join(','));
        });

        if (rows.length <= 1) {
            showToast('La tabla está vacía — no hay datos para exportar.', 'warn');
            return;
        }

        var csv = rows.join('\n');
        // BOM prefix so Excel opens UTF-8 correctly
        var blob = new Blob(['\uFEFF' + csv], { type: 'text/csv;charset=utf-8;' });
        var url = URL.createObjectURL(blob);
        var a = document.createElement('a');
        a.href = url;
        a.download = prefix + '_nexus_' + new Date().toISOString().slice(0, 10) + '.csv';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);

        showToast('CSV descargado: ' + a.download, 'ok');
    };

    // ── Print (PDF) ────────────────────────────────────────────────
    window.printPage = function() {
        window.print();
    };

    // ── Toast (simple, non-blocking notification) ──────────────────
    // Only creates its own toast if the page doesn't already have one.
    window.showToast = function(msg, type) {
        type = type || 'info';
        var container = document.getElementById('toast-container');
        if (!container) {
            container = document.createElement('div');
            container.id = 'toast-container';
            container.style.cssText = 'position:fixed;top:16px;right:16px;z-index:9999;display:flex;flex-direction:column;gap:8px;pointer-events:none;';
            document.body.appendChild(container);
        }

        var colors = {
            ok: 'background:#1a7a3a;color:#fff;',
            error: 'background:#c0392b;color:#fff;',
            warn: 'background:#d4a017;color:#000;',
            info: 'background:var(--color-surface-3,#333);color:var(--color-text-primary,#fff);',
        };

        var toast = document.createElement('div');
        toast.style.cssText = (colors[type] || colors.info) +
            'padding:10px 20px;border-radius:8px;font-size:14px;font-weight:500;' +
            'box-shadow:0 4px 12px rgba(0,0,0,0.3);pointer-events:auto;' +
            'animation:slideInRight 0.3s ease;max-width:400px;';
        toast.textContent = msg;
        container.appendChild(toast);

        setTimeout(function() {
            toast.style.opacity = '0';
            toast.style.transition = 'opacity 0.3s';
            setTimeout(function() { toast.remove(); }, 300);
        }, 3000);
    };

    // ── "Próximamente" placeholder for features not yet built ──────
    window.featureProximamente = function(nombre) {
        showToast((nombre || 'Esta función') + ' estará disponible próximamente.', 'info');
    };

    // ── Table Filter Panel ────────────────────────────────────────
    // Creates a dropdown filter panel that filters visible table rows
    // client-side. Call toggleFilterPanel(buttonEl, config) where config
    // is an array of {label, column, values} describing each filter.
    //
    // Usage (from onclick):
    //   toggleFilterPanel(this, [
    //     {label: 'Marca', column: 2, values: ['BOSCH','MONROE','Todas']},
    //     {label: 'Status', column: 4, values: ['Activo','Inactivo','Todos']},
    //   ])

    var _activeFilterPanel = null;

    window.toggleFilterPanel = function(btnEl, filters) {
        // Close existing panel if open
        if (_activeFilterPanel) {
            _activeFilterPanel.remove();
            _activeFilterPanel = null;
            return;
        }

        var panel = document.createElement('div');
        panel.className = 'filter-panel';
        panel.style.cssText = 'position:absolute;top:100%;right:0;z-index:1000;' +
            'background:var(--glass-bg-strong,#1a1a1a);backdrop-filter:blur(16px);' +
            'border:1px solid var(--glass-border,#333);border-radius:var(--radius-lg,12px);' +
            'padding:16px;min-width:260px;box-shadow:0 8px 32px rgba(0,0,0,0.3);' +
            'display:flex;flex-direction:column;gap:12px;';

        var title = document.createElement('div');
        title.style.cssText = 'font-weight:700;font-size:14px;display:flex;justify-content:space-between;align-items:center;';
        title.innerHTML = 'Filtros <button onclick="closeFilterPanel()" style="background:none;border:none;color:var(--color-text-muted);cursor:pointer;font-size:18px;">✕</button>';
        panel.appendChild(title);

        filters.forEach(function(f) {
            var group = document.createElement('div');
            var label = document.createElement('label');
            label.style.cssText = 'display:block;font-size:12px;color:var(--color-text-muted);margin-bottom:4px;text-transform:uppercase;letter-spacing:0.05em;';
            label.textContent = f.label;
            group.appendChild(label);

            var select = document.createElement('select');
            select.style.cssText = 'width:100%;padding:8px 10px;background:var(--glass-bg,#222);' +
                'border:1px solid var(--glass-border,#444);border-radius:6px;' +
                'color:var(--color-text-primary,#fff);font-size:13px;';
            select.dataset.filterColumn = f.column;

            // "Todos" option always first
            var allOpt = document.createElement('option');
            allOpt.value = '';
            allOpt.textContent = f.allLabel || 'Todos';
            select.appendChild(allOpt);

            (f.values || []).forEach(function(v) {
                if (!v) return;
                var opt = document.createElement('option');
                opt.value = v;
                opt.textContent = v;
                select.appendChild(opt);
            });

            select.addEventListener('change', function() { applyFilters(panel); });
            group.appendChild(select);
            panel.appendChild(group);
        });

        // Clear all button
        var clearBtn = document.createElement('button');
        clearBtn.style.cssText = 'padding:8px;background:transparent;border:1px dashed var(--glass-border,#444);' +
            'border-radius:6px;color:var(--color-text-muted);cursor:pointer;font-size:12px;';
        clearBtn.textContent = 'Limpiar filtros';
        clearBtn.addEventListener('click', function() {
            panel.querySelectorAll('select').forEach(function(s) { s.value = ''; });
            applyFilters(panel);
        });
        panel.appendChild(clearBtn);

        // Position relative to the button
        var wrapper = btnEl.parentElement;
        if (wrapper) wrapper.style.position = 'relative';
        (wrapper || document.body).appendChild(panel);
        _activeFilterPanel = panel;

        // Close on outside click
        setTimeout(function() {
            document.addEventListener('click', function handler(e) {
                if (!panel.contains(e.target) && e.target !== btnEl) {
                    closeFilterPanel();
                    document.removeEventListener('click', handler);
                }
            });
        }, 100);
    };

    window.closeFilterPanel = function() {
        if (_activeFilterPanel) {
            _activeFilterPanel.remove();
            _activeFilterPanel = null;
        }
    };

    function applyFilters(panel) {
        var selects = panel.querySelectorAll('select[data-filter-column]');
        // Find the nearest visible table
        var tables = document.querySelectorAll('table');
        var table = null;
        for (var i = 0; i < tables.length; i++) {
            if (tables[i].offsetParent !== null) { table = tables[i]; break; }
        }
        if (!table) return;

        var rows = table.querySelectorAll('tbody tr');
        rows.forEach(function(tr) {
            var show = true;
            selects.forEach(function(sel) {
                var col = parseInt(sel.dataset.filterColumn);
                var val = sel.value.toLowerCase();
                if (!val) return; // "Todos" — no filter
                var cells = tr.querySelectorAll('td');
                if (cells[col]) {
                    var cellText = cells[col].textContent.trim().toLowerCase();
                    if (cellText.indexOf(val.toLowerCase()) === -1) show = false;
                }
            });
            tr.style.display = show ? '' : 'none';
        });

        // Update count badge if exists
        var visibleCount = 0;
        rows.forEach(function(tr) { if (tr.style.display !== 'none') visibleCount++; });
        var badge = document.querySelector('.filter-count-badge');
        if (badge) badge.textContent = visibleCount + ' resultados';
    }

    // ── Auto-extract unique values from a table column ──────────
    // Useful for building filter options dynamically from data.
    window.getUniqueColumnValues = function(tableEl, colIndex, maxValues) {
        maxValues = maxValues || 30;
        var values = {};
        if (!tableEl) return [];
        tableEl.querySelectorAll('tbody tr').forEach(function(tr) {
            var cells = tr.querySelectorAll('td');
            if (cells[colIndex]) {
                var v = cells[colIndex].textContent.trim();
                if (v && v !== '-' && v !== '') values[v] = (values[v] || 0) + 1;
            }
        });
        // Sort by frequency (most common first)
        return Object.keys(values)
            .sort(function(a, b) { return values[b] - values[a]; })
            .slice(0, maxValues);
    };

    // ── Auto-print polling for WhatsApp quotations ───────────────
    // Polls /quotations/print-queue every 15s. When a confirmed WA quote
    // is found, it fetches the ESC/POS bytes and sends to the connected
    // thermal printer. Falls back to browser print if no thermal is connected.

    var _autoPrintTimer = null;
    var _autoPrintEnabled = false;

    window.startAutoPrint = function() {
        if (_autoPrintTimer) return;
        _autoPrintEnabled = true;
        var token = localStorage.getItem('pos_token');
        if (!token) return;

        _autoPrintTimer = setInterval(function() {
            fetch('/pos/api/quotations/print-queue', {
                headers: { 'Authorization': 'Bearer ' + token }
            })
            .then(function(r) { return r.json(); })
            .then(function(d) {
                if (!d.data || !d.data.length) return;
                d.data.forEach(function(q) {
                    console.log('[auto-print] Cotización #' + q.id + ' confirmada por WhatsApp — imprimiendo...');
                    showToast('🖨️ Imprimiendo cotización #' + q.id + ' (WhatsApp)', 'ok');
                    autoPrintQuote(q.id, token);
                });
            })
            .catch(function() {}); // silent on errors
        }, 15000); // every 15 seconds

        console.log('[auto-print] Enabled — polling every 15s');
    };

    window.stopAutoPrint = function() {
        if (_autoPrintTimer) {
            clearInterval(_autoPrintTimer);
            _autoPrintTimer = null;
        }
        _autoPrintEnabled = false;
    };

    function autoPrintQuote(quoteId, token) {
        // Try thermal printer first (via NexusPrinter if loaded)
        if (typeof NexusPrinter !== 'undefined' && NexusPrinter.isConnected && NexusPrinter.isConnected()) {
            fetch('/pos/api/quotations/' + quoteId + '/print', {
                method: 'POST',
                headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
                body: JSON.stringify({ printer_type: 'escpos_raw', width: 80 }),
            })
            .then(function(r) { return r.arrayBuffer(); })
            .then(function(buf) {
                NexusPrinter.sendRaw(new Uint8Array(buf));
                markPrinted(quoteId, token);
            })
            .catch(function(e) {
                console.error('[auto-print] Thermal print failed:', e);
                browserPrintQuote(quoteId, token);
            });
        } else {
            browserPrintQuote(quoteId, token);
        }
    }

    function browserPrintQuote(quoteId, token) {
        // Fallback: open a print-friendly window
        fetch('/pos/api/quotations/' + quoteId + '/print', {
            method: 'POST',
            headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
            body: JSON.stringify({ printer_type: 'browser' }),
        })
        .then(function(r) { return r.json(); })
        .then(function(q) {
            var html = '<html><head><title>Cotización #' + q.id + '</title>';
            html += '<style>body{font-family:monospace;font-size:12px;width:80mm;margin:0 auto;padding:10px;}';
            html += 'h1{font-size:18px;text-align:center;margin:0;}';
            html += '.center{text-align:center;}.right{text-align:right;}';
            html += 'hr{border:none;border-top:1px dashed #000;}';
            html += 'table{width:100%;border-collapse:collapse;}td{padding:2px 4px;}</style></head><body>';
            html += '<h1>COTIZACIÓN</h1>';
            html += '<p class="center">COT-' + q.id + '</p>';
            html += '<p>Fecha: ' + (q.created_at || '').substring(0, 10) + '</p>';
            if (q.customer_name) html += '<p>Cliente: ' + q.customer_name + '</p>';
            if (q.wa_phone) html += '<p>WhatsApp: ' + q.wa_phone + '</p>';
            html += '<hr><table>';
            (q.items || []).forEach(function(it) {
                html += '<tr><td>' + it.quantity + 'x ' + it.name + '</td><td class="right">$' + it.subtotal.toFixed(2) + '</td></tr>';
                if (it.part_number) html += '<tr><td colspan="2" style="font-size:10px;color:#666;">  #' + it.part_number + '</td></tr>';
            });
            html += '</table><hr>';
            html += '<p class="right">Subtotal: $' + q.subtotal.toFixed(2) + '</p>';
            html += '<p class="right">IVA: $' + q.tax_total.toFixed(2) + '</p>';
            html += '<p class="right" style="font-size:16px;font-weight:bold;">TOTAL: $' + q.total.toFixed(2) + '</p>';
            html += '<hr><p class="center" style="font-size:10px;">Esta cotización no es comprobante fiscal<br>Precios sujetos a disponibilidad</p>';
            html += '</body></html>';

            var w = window.open('', '_blank', 'width=400,height=600');
            w.document.write(html);
            w.document.close();
            setTimeout(function() { w.print(); }, 500);
            markPrinted(quoteId, token);
        })
        .catch(function(e) {
            console.error('[auto-print] Browser print failed:', e);
        });
    }

    function markPrinted(quoteId, token) {
        fetch('/pos/api/quotations/' + quoteId + '/mark-printed', {
            method: 'POST',
            headers: { 'Authorization': 'Bearer ' + token },
        }).catch(function() {});
    }

    // Auto-start polling on pages that are likely to have a printer
    // (POS sale page and quotations page)
    if (window.location.pathname.indexOf('/pos/sale') !== -1 ||
        window.location.pathname.indexOf('/pos/quotation') !== -1 ||
        window.location.pathname.indexOf('/pos/dashboard') !== -1) {
        var _initToken = localStorage.getItem('pos_token');
        if (_initToken) {
            setTimeout(function() { startAutoPrint(); }, 3000);
        }
    }

})();