// Vehicle Dashboard JavaScript - Navegación por tarjetas
class VehicleDashboard {
    constructor() {
        this.currentView = 'brands'; // brands, models, vehicles
        this.selectedBrand = null;
        this.selectedModel = null;
        this.allVehicles = [];
        this.filteredVehicles = [];
        this.stats = { brands: 0, models: 0, vehicles: 0 };
        this.init();
    }

    async init() {
        await this.loadStats();
        await this.showBrands();
        this.bindFilterEvents();
    }

    async loadStats() {
        try {
            const [brandsRes, vehiclesRes] = await Promise.all([
                fetch('/api/brands'),
                fetch('/api/vehicles')
            ]);

            if (brandsRes.ok && vehiclesRes.ok) {
                const brands = await brandsRes.json();
                const vehicles = await vehiclesRes.json();

                // Contar modelos únicos
                const uniqueModels = new Set(vehicles.map(v => `${v.brand}-${v.model}`));

                this.stats.brands = brands.length;
                this.stats.models = uniqueModels.size;
                this.stats.vehicles = vehicles.length;

                document.getElementById('totalBrands').textContent = this.stats.brands;
                document.getElementById('totalModels').textContent = this.stats.models;
                document.getElementById('totalVehicles').textContent = this.stats.vehicles;
            }
        } catch (error) {
            console.error('Error loading stats:', error);
        }
    }

    updateBreadcrumb() {
        const breadcrumb = document.getElementById('breadcrumb');
        let html = '';

        if (this.currentView === 'brands') {
            html = `<li class="breadcrumb-item active"><i class="fas fa-home"></i> Marcas</li>`;
        } else if (this.currentView === 'models') {
            html = `
                <li class="breadcrumb-item">
                    <a href="#" onclick="dashboard.goToBrands(); return false;">
                        <i class="fas fa-home"></i> Marcas
                    </a>
                </li>
                <li class="breadcrumb-item active">${this.selectedBrand}</li>
            `;
        } else if (this.currentView === 'vehicles') {
            html = `
                <li class="breadcrumb-item">
                    <a href="#" onclick="dashboard.goToBrands(); return false;">
                        <i class="fas fa-home"></i> Marcas
                    </a>
                </li>
                <li class="breadcrumb-item">
                    <a href="#" onclick="dashboard.goToModels('${this.selectedBrand}'); return false;">
                        ${this.selectedBrand}
                    </a>
                </li>
                <li class="breadcrumb-item active">${this.selectedModel}</li>
            `;
        }

        breadcrumb.innerHTML = html;
    }

    async showBrands() {
        this.currentView = 'brands';
        this.selectedBrand = null;
        this.selectedModel = null;
        this.updateBreadcrumb();
        this.hideFilters();

        const container = document.getElementById('mainContent');
        container.innerHTML = `
            <div class="loading-state">
                <i class="fas fa-spinner fa-spin"></i>
                <h4>Cargando marcas...</h4>
            </div>
        `;

        try {
            const [brandsRes, vehiclesRes] = await Promise.all([
                fetch('/api/brands'),
                fetch('/api/vehicles')
            ]);

            if (!brandsRes.ok || !vehiclesRes.ok) {
                throw new Error('Error al cargar datos');
            }

            const brands = await brandsRes.json();
            const vehicles = await vehiclesRes.json();

            // Contar modelos y vehículos por marca
            const brandStats = {};
            brands.forEach(brand => {
                brandStats[brand] = { models: new Set(), vehicles: 0 };
            });

            vehicles.forEach(v => {
                if (brandStats[v.brand]) {
                    brandStats[v.brand].models.add(v.model);
                    brandStats[v.brand].vehicles++;
                }
            });

            if (brands.length === 0) {
                container.innerHTML = `
                    <div class="empty-state">
                        <i class="fas fa-car"></i>
                        <h4>No hay marcas disponibles</h4>
                        <p>Agrega algunas marcas a la base de datos</p>
                    </div>
                `;
                return;
            }

            container.innerHTML = `<div class="content-grid brands-grid">
                ${brands.map(brand => `
                    <div class="brand-card" onclick="dashboard.goToModels('${brand}')">
                        <div class="brand-icon">
                            <i class="fas fa-car"></i>
                        </div>
                        <div class="brand-name">${brand}</div>
                        <div class="brand-count">
                            ${brandStats[brand].models.size} modelos
                        </div>
                        <div class="brand-count">
                            ${brandStats[brand].vehicles} vehículos
                        </div>
                    </div>
                `).join('')}
            </div>`;

        } catch (error) {
            console.error('Error:', error);
            container.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-exclamation-triangle"></i>
                    <h4>Error al cargar marcas</h4>
                    <p>${error.message}</p>
                </div>
            `;
        }
    }

    async goToModels(brand) {
        this.currentView = 'models';
        this.selectedBrand = brand;
        this.selectedModel = null;
        this.updateBreadcrumb();
        this.hideFilters();

        const container = document.getElementById('mainContent');
        container.innerHTML = `
            <div class="loading-state">
                <i class="fas fa-spinner fa-spin"></i>
                <h4>Cargando modelos de ${brand}...</h4>
            </div>
        `;

        try {
            const [modelsRes, vehiclesRes] = await Promise.all([
                fetch(`/api/models?brand=${encodeURIComponent(brand)}`),
                fetch(`/api/vehicles?brand=${encodeURIComponent(brand)}`)
            ]);

            if (!modelsRes.ok || !vehiclesRes.ok) {
                throw new Error('Error al cargar datos');
            }

            const models = await modelsRes.json();
            const vehicles = await vehiclesRes.json();

            // Contar vehículos y años por modelo
            const modelStats = {};
            models.forEach(model => {
                modelStats[model] = { years: new Set(), vehicles: 0, engines: new Set() };
            });

            vehicles.forEach(v => {
                if (modelStats[v.model]) {
                    modelStats[v.model].years.add(v.year);
                    modelStats[v.model].vehicles++;
                    modelStats[v.model].engines.add(v.engine);
                }
            });

            if (models.length === 0) {
                container.innerHTML = `
                    <div class="empty-state">
                        <i class="fas fa-car-side"></i>
                        <h4>No hay modelos para ${brand}</h4>
                        <p>Esta marca no tiene modelos registrados</p>
                        <button class="btn btn-back mt-3" onclick="dashboard.goToBrands()">
                            <i class="fas fa-arrow-left"></i> Volver a marcas
                        </button>
                    </div>
                `;
                return;
            }

            container.innerHTML = `<div class="content-grid models-grid">
                ${models.map(model => {
                    const stats = modelStats[model];
                    const yearsArray = Array.from(stats.years).sort((a, b) => b - a);
                    const yearRange = yearsArray.length > 0
                        ? (yearsArray.length > 1
                            ? `${yearsArray[yearsArray.length - 1]} - ${yearsArray[0]}`
                            : `${yearsArray[0]}`)
                        : 'N/A';

                    return `
                        <div class="model-card" onclick="dashboard.goToVehicles('${brand}', '${model}')">
                            <div class="model-name">${model}</div>
                            <div class="model-info">
                                <i class="fas fa-calendar-alt"></i> ${yearRange}
                            </div>
                            <div class="model-info">
                                <i class="fas fa-cogs"></i> ${stats.engines.size} motores
                            </div>
                            <div class="model-info">
                                <i class="fas fa-list"></i> ${stats.vehicles} variantes
                            </div>
                        </div>
                    `;
                }).join('')}
            </div>`;

        } catch (error) {
            console.error('Error:', error);
            container.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-exclamation-triangle"></i>
                    <h4>Error al cargar modelos</h4>
                    <p>${error.message}</p>
                    <button class="btn btn-back mt-3" onclick="dashboard.goToBrands()">
                        <i class="fas fa-arrow-left"></i> Volver a marcas
                    </button>
                </div>
            `;
        }
    }

    async goToVehicles(brand, model) {
        this.currentView = 'vehicles';
        this.selectedBrand = brand;
        this.selectedModel = model;
        this.updateBreadcrumb();
        this.showFilters();

        const container = document.getElementById('mainContent');
        container.innerHTML = `
            <div class="loading-state">
                <i class="fas fa-spinner fa-spin"></i>
                <h4>Cargando vehículos...</h4>
            </div>
        `;

        try {
            const response = await fetch(
                `/api/vehicles?brand=${encodeURIComponent(brand)}&model=${encodeURIComponent(model)}`
            );

            if (!response.ok) {
                throw new Error('Error al cargar vehículos');
            }

            this.allVehicles = await response.json();
            this.filteredVehicles = [...this.allVehicles];

            // Poblar filtros
            await this.populateFilters(brand, model);

            this.displayVehicles();

        } catch (error) {
            console.error('Error:', error);
            container.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-exclamation-triangle"></i>
                    <h4>Error al cargar vehículos</h4>
                    <p>${error.message}</p>
                    <button class="btn btn-back mt-3" onclick="dashboard.goToModels('${brand}')">
                        <i class="fas fa-arrow-left"></i> Volver a modelos
                    </button>
                </div>
            `;
        }
    }

    async populateFilters(brand, model) {
        try {
            const [yearsRes, enginesRes] = await Promise.all([
                fetch(`/api/years?brand=${encodeURIComponent(brand)}&model=${encodeURIComponent(model)}`),
                fetch(`/api/engines?brand=${encodeURIComponent(brand)}&model=${encodeURIComponent(model)}`)
            ]);

            if (yearsRes.ok) {
                const years = await yearsRes.json();
                const yearFilter = document.getElementById('yearFilter');
                yearFilter.innerHTML = '<option value="">Todos los años</option>';
                years.forEach(year => {
                    yearFilter.innerHTML += `<option value="${year}">${year}</option>`;
                });
            }

            if (enginesRes.ok) {
                const engines = await enginesRes.json();
                const engineFilter = document.getElementById('engineFilter');
                engineFilter.innerHTML = '<option value="">Todos los motores</option>';
                engines.forEach(engine => {
                    engineFilter.innerHTML += `<option value="${engine}">${engine}</option>`;
                });
            }

        } catch (error) {
            console.error('Error populating filters:', error);
        }
    }

    bindFilterEvents() {
        document.getElementById('yearFilter').addEventListener('change', () => {
            this.applyFilters();
        });

        document.getElementById('engineFilter').addEventListener('change', () => {
            this.applyFilters();
        });
    }

    applyFilters() {
        const year = document.getElementById('yearFilter').value;
        const engine = document.getElementById('engineFilter').value;

        this.filteredVehicles = this.allVehicles.filter(v => {
            return (!year || v.year.toString() === year) &&
                   (!engine || v.engine === engine);
        });

        this.displayVehicles();
    }

    displayVehicles() {
        const container = document.getElementById('mainContent');
        const resultCount = document.getElementById('resultCount');

        resultCount.textContent = `${this.filteredVehicles.length} resultado${this.filteredVehicles.length !== 1 ? 's' : ''}`;

        if (this.filteredVehicles.length === 0) {
            container.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-car"></i>
                    <h4>No se encontraron vehículos</h4>
                    <p>Intenta ajustar los filtros</p>
                </div>
            `;
            return;
        }

        container.innerHTML = `<div class="content-grid vehicles-grid">
            ${this.filteredVehicles.map(v => `
                <div class="vehicle-card">
                    <div class="vehicle-header">
                        <div class="vehicle-title">${v.year} ${v.brand} ${v.model}</div>
                        <div class="vehicle-engine">${v.engine}</div>
                    </div>
                    <div class="vehicle-body">
                        <div class="vehicle-specs">
                            <div class="spec-item">
                                <i class="fas fa-gas-pump"></i>
                                <div class="spec-value">${v.fuel_type || 'N/A'}</div>
                            </div>
                            <div class="spec-item">
                                <i class="fas fa-tachometer-alt"></i>
                                <div class="spec-value">${v.power_hp || 0} HP</div>
                            </div>
                            <div class="spec-item">
                                <i class="fas fa-cogs"></i>
                                <div class="spec-value">${v.transmission || 'N/A'}</div>
                            </div>
                            <div class="spec-item">
                                <i class="fas fa-road"></i>
                                <div class="spec-value">${v.drivetrain || 'N/A'}</div>
                            </div>
                            <div class="spec-item">
                                <i class="fas fa-cube"></i>
                                <div class="spec-value">${v.cylinders || 0} cil.</div>
                            </div>
                            <div class="spec-item">
                                <i class="fas fa-oil-can"></i>
                                <div class="spec-value">${v.displacement_cc || 0} cc</div>
                            </div>
                        </div>
                        ${v.trim_level && v.trim_level !== 'unknown' ? `
                            <div class="mt-2 text-center">
                                <span class="badge bg-primary">${v.trim_level}</span>
                            </div>
                        ` : ''}
                    </div>
                </div>
            `).join('')}
        </div>`;
    }

    goToBrands() {
        this.showBrands();
    }

    showFilters() {
        document.getElementById('filtersBar').style.display = 'block';
        // Reset filters
        document.getElementById('yearFilter').value = '';
        document.getElementById('engineFilter').value = '';
    }

    hideFilters() {
        document.getElementById('filtersBar').style.display = 'none';
    }
}

// Initialize dashboard globally
let dashboard;
document.addEventListener('DOMContentLoaded', () => {
    dashboard = new VehicleDashboard();
});