/**
 * UTM Analytics Pro - Main Application Logic
 */

// --- Shopify Configuration ---
const SHOPIFY_CONFIG = {
    storeName: 'sua-loja', // Substitua pelo nome da sua loja (ex: minhaloja em minhaloja.myshopify.com)
    accessToken: 'seu_access_token_aqui', // Token de Acesso da API Admin do Shopify
    apiVersion: '2024-01'
};

// --- Mock Data & API Simulation ---
const UTMS = [
    "facebook_feed_summer",
    "instagram_stories_launch",
    "google_search_brand",
    "tiktok_viral_video",
    "email_newsletter_oct",
    "influencer_beauty_guru",
    "youtube_pre_roll",
    "facebook_retargeting_abandoned"
];

const NAMES = ["Ana Silva", "Bruno Souza", "Carla Dias", "Daniel Rocha", "Eduarda Lima"];

// Generates random orders based on date range
function generateMockOrders(startDate, endDate, count = 20) {
    const orders = [];
    const start = new Date(startDate).getTime();
    const end = new Date(endDate).getTime();
    
    for (let i = 0; i < count; i++) {
        const randomTime = start + Math.random() * (end - start);
        const isPaid = Math.random() > 0.3; // 70% paid rate
        const utm = UTMS[Math.floor(Math.random() * UTMS.length)];
        
        orders.push({
            id: `gid://shopify/Order/${Math.floor(Math.random() * 1000000000)}`,
            name: `#${Math.floor(1000 + Math.random() * 9000)}`,
            createdAt: new Date(randomTime).toISOString(),
            displayFinancialStatus: isPaid ? 'PAID' : 'PENDING',
            totalPriceSet: {
                shopMoney: {
                    amount: (Math.random() * 500 + 50).toFixed(2) // Random price between 50 and 550
                }
            },
            customer: {
                email: Math.random() > 0.5 ? `cliente${i}@email.com` : null
            },
            customAttributes: [
                { key: 'utm_content', value: utm }
            ]
        });
    }
    return orders.sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt));
}

// --- Application State ---

const app = {
    state: {
        dateRangeOption: 'hoje',
        customDateRange: null,
        loading: false,
        error: null,
        utmData: [],
        allOrders: [],
        snapshot: null, // { timestamp, orderIds }
        lastUpdate: null,
        sortColumn: 'totalVendas',
        sortDirection: 'desc'
    },

    init() {
        this.cacheDOM();
        this.bindEvents();
        // Initial load isn't automatic to match the "No data" state, 
        // but let's pre-load some empty states
        this.updateUI();
    },

    cacheDOM() {
        this.dom = {
            dateSelect: document.getElementById('date-range-select'),
            customDateContainer: document.getElementById('custom-date-container'),
            dateStart: document.getElementById('date-start'),
            dateEnd: document.getElementById('date-end'),
            refreshBtn: document.getElementById('refresh-btn'),
            exportBtn: document.getElementById('export-btn'),
            alertsArea: document.getElementById('alerts-area'),
            kpiSection: document.getElementById('kpi-section'),
            tableLoading: document.getElementById('table-loading'),
            tableEmpty: document.getElementById('table-empty'),
            dataTable: document.getElementById('data-table'),
            tableBody: document.getElementById('table-body'),
            tableFooter: document.getElementById('table-footer'),
            sortSelect: document.getElementById('sort-select'),
            // KPIs
            kpiTotalOrders: document.getElementById('kpi-total-orders'),
            kpiPaidSales: document.getElementById('kpi-paid-sales'),
            kpiConversion: document.getElementById('kpi-conversion-rate'),
            kpiUniqueUtms: document.getElementById('kpi-unique-utms'),
        };
    },

    bindEvents() {
        this.dom.dateSelect.addEventListener('change', (e) => {
            this.state.dateRangeOption = e.target.value;
            if (this.state.dateRangeOption === 'customizado') {
                this.dom.customDateContainer.classList.remove('hidden');
            } else {
                this.dom.customDateContainer.classList.add('hidden');
            }
        });

        this.dom.refreshBtn.addEventListener('click', () => this.fetchOrders());
        this.dom.exportBtn.addEventListener('click', () => this.exportCSV());
        this.dom.sortSelect.addEventListener('change', (e) => {
            this.state.sortColumn = e.target.value;
            this.state.sortDirection = 'desc';
            this.renderTable();
        });
    },

    // --- Logic & Helpers ---

    getDateRange() {
        const now = new Date();
        const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
        let startDate, endDate = new Date(today.getTime() + 24 * 60 * 60 * 1000 - 1);

        switch (this.state.dateRangeOption) {
            case 'hoje':
                startDate = today;
                break;
            case 'ontem':
                startDate = new Date(today.getTime() - 24 * 60 * 60 * 1000);
                endDate = new Date(today.getTime() - 1);
                break;
            case 'ultimos7':
                startDate = new Date(today.getTime() - 7 * 24 * 60 * 60 * 1000);
                break;
            case 'ultimos30':
                startDate = new Date(today.getTime() - 30 * 24 * 60 * 60 * 1000);
                break;
            case 'customizado':
                if (this.dom.dateStart.value && this.dom.dateEnd.value) {
                    return {
                        startDate: new Date(this.dom.dateStart.value).toISOString(),
                        endDate: new Date(this.dom.dateEnd.value).toISOString()
                    };
                }
                // Fallback if dates not picked yet
                startDate = today;
                break;
            default:
                startDate = today;
        }

        return { startDate: startDate.toISOString(), endDate: endDate.toISOString() };
    },

    calculateTimeDiff(timestamp) {
        const now = new Date();
        const then = new Date(timestamp);
        const diffMinutes = Math.floor((now - then) / 60000);
        
        if (diffMinutes < 1) return "menos de 1 minuto";
        const hours = Math.floor(diffMinutes / 60);
        const mins = diffMinutes % 60;
        if (hours === 0) return `${mins}m`;
        return `${hours}h e ${mins}m`;
    },

    // --- Core Actions ---
    async fetchShopifyData(startDate, endDate) {
        const query = `
        {
            orders(first: 250, query: "created_at:>='${startDate}' AND created_at:<='${endDate}'") {
                edges {
                    node {
                        id
                        name
                        createdAt
                        displayFinancialStatus
                        totalPriceSet {
                            shopMoney {
                                amount
                                currencyCode
                            }
                        }
                        customer {
                            email
                        }
                        customAttributes {
                            key
                            value
                        }
                    }
                }
            }
        }`;

        const response = await fetch(`https://${SHOPIFY_CONFIG.storeName}.myshopify.com/admin/api/${SHOPIFY_CONFIG.apiVersion}/graphql.json`, {
            method: 'POST',
            headers: {
                'X-Shopify-Access-Token': SHOPIFY_CONFIG.accessToken,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ query })
        });

        if (!response.ok) {
            const errorText = await response.text();
            throw new Error(`Shopify API Error: ${response.status} - ${errorText}`);
        }

        const data = await response.json();
        return data.data.orders.edges.map(edge => edge.node);
    },

    async fetchOrders() {
        this.state.loading = true;
        this.state.error = null;
        this.updateUI();

        try {
            const { startDate, endDate } = this.getDateRange();
            
            let allOrders = [];

            // Tenta buscar dados reais do Shopify se as credenciais estiverem configuradas
            if (SHOPIFY_CONFIG.storeName !== 'sua-loja' && SHOPIFY_CONFIG.accessToken !== 'seu_access_token_aqui') {
                try {
                    console.log("Conectando ao Shopify...");
                    allOrders = await this.fetchShopifyData(startDate.split('T')[0], endDate.split('T')[0]);
                } catch (apiError) {
                    console.warn("Falha ao buscar dados da API Shopify, usando dados mockados:", apiError);
                    this.state.error = "Erro na API Shopify: " + apiError.message + ". Exibindo dados simulados.";
                    // Fallback para mock
                    const orderCount = Math.floor(Math.random() * 30) + 10; 
                    allOrders = generateMockOrders(startDate, endDate, orderCount);
                }
            } else {
                // Dados Mockados
                await new Promise(r => setTimeout(r, 1500)); // Simulate Network Delay
                const orderCount = Math.floor(Math.random() * 30) + 10; 
                allOrders = generateMockOrders(startDate, endDate, orderCount);
            }
// 2. Compare with Snapshot for "New Orders"
            let newOrdersReport = null;
            if (this.state.snapshot) {
                const previousIds = new Set(this.state.snapshot.orderIds);
                const newOrders = allOrders.filter(o => !previousIds.has(o.id));
                
                if (newOrders.length > 0) {
                    const totalVal = newOrders.reduce((sum, o) => sum + parseFloat(o.totalPriceSet.shopMoney.amount), 0);
                    const paidVal = newOrders.filter(o => o.displayFinancialStatus === 'PAID')
                        .reduce((sum, o) => sum + parseFloat(o.totalPriceSet.shopMoney.amount), 0);
                    
                    newOrdersReport = {
                        count: newOrders.length,
                        total: totalVal,
                        paid: paidVal,
                        timeDiff: this.calculateTimeDiff(this.state.snapshot.timestamp)
                    };
                } else {
                     newOrdersReport = { count: 0, timeDiff: this.calculateTimeDiff(this.state.snapshot.timestamp) };
                }
            }

            // 3. Update Snapshot
            this.state.snapshot = {
                timestamp: new Date().toISOString(),
                orderIds: allOrders.map(o => o.id)
            };
            this.state.lastUpdate = new Date().toLocaleTimeString('pt-BR', {hour: '2-digit', minute:'2-digit'});

            // 4. Process Data
            this.processOrders(allOrders);
            this.state.newOrdersReport = newOrdersReport;

        } catch (err) {
            console.error(err);
            this.state.error = "Erro ao carregar dados. Tente novamente.";
            console.error(err);
        } finally {
            this.state.loading = false;
            this.updateUI();
        }
    },
processOrders(orders) {
        const utmGroups = new Map();

        orders.forEach(order => {
            // Find UTM Content
            let utm = 'Sem UTM Content';
            const attr = order.customAttributes.find(a => a.key === 'utm_content');
            if (attr && attr.value) utm = attr.value.trim();

            if (!utmGroups.has(utm)) utmGroups.set(utm, []);
            utmGroups.get(utm).push(order);
        });

        const processed = [];
        utmGroups.forEach((group, utmName) => {
            const total = group.length;
            const paidCount = group.filter(o => o.displayFinancialStatus === 'PAID').length;
            const uniqueClients = new Set(group.map(o => o.customer?.email || o.id)).size;
            
            const totalSales = group.reduce((sum, o) => sum + parseFloat(o.totalPriceSet.shopMoney.amount), 0);
            const paidSales = group.filter(o => o.displayFinancialStatus === 'PAID')
                .reduce((sum, o) => sum + parseFloat(o.totalPriceSet.shopMoney.amount), 0);
            
            const rate = total > 0 ? (paidCount / total) * 100 : 0;

            processed.push({
                utmContent: utmName,
                totalPedidos: total,
                pedidosPagos: paidCount,
                pedidosPendentes: total - paidCount,
                clientesUnicos: uniqueClients,
                totalVendas: totalSales,
                vendasPagas: paidSales,
                taxaPagamento: rate
            });
        });

        this.state.utmData = processed;
    },

    handleSort(column) {
        if (this.state.sortColumn === column) {
            this.state.sortDirection = this.state.sortDirection === 'asc' ? 'desc' : 'asc';
        } else {
            this.state.sortColumn = column;
            this.state.sortDirection = 'desc';
        }
        this.renderTable();
    },

    getSortedData() {
        return [...this.state.utmData].sort((a, b) => {
            let valA = a[this.state.sortColumn];
            let valB = b[this.state.sortColumn];

            if (typeof valA === 'string') {
                valA = valA.toLowerCase();
                valB = valB.toLowerCase();
            }

            if (valA < valB) return this.state.sortDirection === 'asc' ? -1 : 1;
            if (valA > valB) return this.state.sortDirection === 'asc' ? 1 : -1;
            return 0;
        });
    },

    calculateTotals() {
        return this.state.utmData.reduce((acc, curr) => {
            acc.totalPedidos += curr.totalPedidos;
            acc.pedidosPagos += curr.pedidosPagos;
            acc.clientesUnicos += curr.clientesUnicos;
            acc.totalVendas += curr.totalVendas;
            acc.vendasPagas += curr.vendasPagas;
            return acc;
        }, {
            totalPedidos: 0, pedidosPagos: 0, clientesUnicos: 0,
            totalVendas: 0, vendasPagas: 0, utmContent: 'TOTAL GERAL'
        });
    },

    // --- UI Rendering ---

    updateUI() {
        // Loading State
        if (this.state.loading) {
            this.dom.tableLoading.classList.remove('hidden');
            this.dom.dataTable.classList.add('hidden');
            this.dom.tableEmpty.classList.add('hidden');
            this.dom.kpiSection.classList.add('hidden');
            this.dom.alertsArea.innerHTML = '';
            this.dom.refreshBtn.disabled = true;
            this.dom.refreshBtn.classList.add('opacity-75');
            return;
        }

        this.dom.refreshBtn.disabled = false;
        this.dom.refreshBtn.classList.remove('opacity-75');
        this.dom.tableLoading.classList.add('hidden');

        // Error State
        if (this.state.error) {
            this.dom.alertsArea.innerHTML = `
                <div class="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded relative">
                    <strong class="font-bold">Erro!</strong>
                    <span class="block sm:inline">${this.state.error}</span>
                </div>`;
            return;
        }

        // Empty State (No data loaded yet)
        if (this.state.utmData.length === 0) {
            this.dom.tableEmpty.classList.remove('hidden');
            this.dom.dataTable.classList.add('hidden');
            this.dom.kpiSection.classList.add('hidden');
            return;
        }

        // Has Data
        this.dom.tableEmpty.classList.add('hidden');
        this.dom.dataTable.classList.remove('hidden');
        this.dom.kpiSection.classList.remove('hidden');
        this.dom.exportBtn.disabled = false;

        this.renderAlerts();
        this.renderKPIs();
        this.renderTable();
    },

    renderAlerts() {
        let html = '';

        // New Orders Alert
        if (this.state.newOrdersReport && this.state.newOrdersReport.count > 0) {
            const r = this.state.newOrdersReport;
            html += `
                <div class="bg-indigo-50 border border-indigo-200 rounded-lg p-4 flex flex-col md:flex-row md:items-center justify-between gap-4 animate-fade-in">
                    <div class="flex items-start gap-3">
                        <div class="bg-indigo-100 p-2 rounded-full text-indigo-600">
                            <i data-feather="bell" class="w-5 h-5"></i>
                        </div>
                        <div>
                            <h3 class="font-bold text-indigo-900">Novas Vendas Detectadas!</h3>
                            <p class="text-indigo-700 text-sm">
                                ${r.count} novos pedidos desde a última atualização (${r.timeDiff} atrás). 
                                Total de <span class="font-bold">R$ ${r.total.toLocaleString('pt-BR', {minimumFractionDigits: 2})}</span>.
                            </p>
                        </div>
                    </div>
                    <button onclick="app.resetSnapshot()" class="text-sm text-indigo-600 hover:text-indigo-800 underline">Resetar Ponto de Partida</button>
                </div>
            `;
        } else if (this.state.snapshot) {
             html += `
                <div class="bg-gray-100 border border-gray-200 rounded-lg px-4 py-2 text-sm text-gray-600 flex justify-between items-center">
                    <span>Última atualização: <strong>${this.state.lastUpdate}</strong></span>
                    <span>Ponto de comparação definido.</span>
                </div>
            `;
        }

        this.dom.alertsArea.innerHTML = html;
        feather.replace();
    },

    renderKPIs() {
        const totals = this.calculateTotals();
        
        this.dom.kpiTotalOrders.textContent = totals.totalPedidos;
        this.dom.kpiPaidSales.textContent = `R$ ${totals.vendasPagas.toLocaleString('pt-BR', {minimumFractionDigits: 2})}`;
        this.dom.kpiUniqueUtms.textContent = this.state.utmData.length;
        
        const rate = totals.totalPedidos > 0 ? (totals.pedidosPagos / totals.totalPedidos) * 100 : 0;
        this.dom.kpiConversion.textContent = `${rate.toFixed(1)}%`;
    },

    renderTable() {
        const data = this.getSortedData();
        const totals = this.calculateTotals();
        
        // Render Rows
        this.dom.tableBody.innerHTML = data.map((row, idx) => {
            const paidPct = row.totalPedidos > 0 ? (row.pedidosPagos / row.totalPedidos) * 100 : 0;
            
            // Determine Badge Color
            let badgeClass = 'badge-critical';
            if (row.taxaPagamento >= 70) badgeClass = 'badge-success';
            else if (row.taxaPagamento >= 50) badgeClass = 'badge-warning';

            return `
                <tr class="hover:bg-gray-50 animate-fade-in" style="animation-delay: ${idx * 50}ms">
                    <td class="p-4">
                        <div class="flex flex-col">
                            <span class="font-semibold text-gray-900 flex items-center gap-2">
                                <span class="${badgeClass}">${row.utmContent}</span>
                            </span>
                        </div>
                    </td>
                    <td class="p-4 text-right">
                        <div class="flex flex-col items-end gap-1">
                             <div class="w-32 bg-gray-200 rounded-full h-2.5 dark:bg-gray-200">
                                <div class="bg-primary h-2.5 rounded-full progress-bar-fill" style="width: ${paidPct}%"></div>
                            </div>
                            <span class="text-xs text-gray-500">${row.pedidosPagos}/${row.totalPedidos}</span>
                        </div>
                    </td>
                    <td class="p-4 text-center">${row.clientesUnicos}</td>
                    <td class="p-4 text-right font-medium">R$ ${row.totalVendas.toLocaleString('pt-BR', {minimumFractionDigits: 2})}</td>
                    <td class="p-4 text-right font-medium text-emerald-600">R$ ${row.vendasPagas.toLocaleString('pt-BR', {minimumFractionDigits: 2})}</td>
                    <td class="p-4 text-center">
                        <span class="${badgeClass} font-bold">${row.taxaPagamento.toFixed(1)}%</span>
                    </td>
                </tr>
            `;
        }).join('');

        // Render Footer
        const totalRate = totals.totalPedidos > 0 ? (totals.pedidosPagos / totals.totalPedidos) * 100 : 0;
        this.dom.tableFooter.innerHTML = `
            <td class="p-4">${totals.utmContent}</td>
            <td class="p-4 text-right">${totals.pedidosPagos}/${totals.totalPedidos}</td>
            <td class="p-4 text-center">${totals.clientesUnicos}</td>
            <td class="p-4 text-right">R$ ${totals.totalVendas.toLocaleString('pt-BR', {minimumFractionDigits: 2})}</td>
            <td class="p-4 text-right text-emerald-600">R$ ${totals.vendasPagas.toLocaleString('pt-BR', {minimumFractionDigits: 2})}</td>
            <td class="p-4 text-center font-bold">${totalRate.toFixed(1)}%</td>
        `;
    },

    resetSnapshot() {
        this.state.snapshot = null;
        this.state.newOrdersReport = null;
        this.renderAlerts();
    },

    exportCSV() {
        const data = this.getSortedData();
        const totals = this.calculateTotals();
        const rows = data.map(r => [
            r.utmContent,
            r.totalPedidos,
            r.pedidosPagos,
            r.clientesUnicos,
            r.totalVendas.toFixed(2),
            r.vendasPagas.toFixed(2),
            r.taxaPagamento.toFixed(1)
        ]);

        // Add totals row
        rows.push([
            totals.utmContent,
            totals.totalPedidos,
            totals.pedidosPagos,
            totals.clientesUnicos,
            totals.totalVendas.toFixed(2),
            totals.vendasPagas.toFixed(2),
            totals.taxaPagamento.toFixed(1)
        ]);

        const csvContent = [
            ['UTM Content', 'Total Pedidos', 'Pedidos Pagos', 'Clientes Unicos', 'Total Vendas', 'Vendas Pagas', 'Taxa Pagamento'],
            ...rows
        ].map(e => e.join(",")).join("\n");

        const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' });
        const link = document.createElement("a");
        const url = URL.createObjectURL(blob);
        
        const dateStr = new Date().toISOString().split('T')[0];
        link.setAttribute("href", url);
        link.setAttribute("download", `relatorio-utm-${dateStr}.csv`);
        link.style.visibility = 'hidden';
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
    }
};

// Start App
document.addEventListener('DOMContentLoaded', () => {
    app.init();
});