// Vehicle Search System - Type-to-filter approach
// Much more user-friendly than cascading dropdowns

class VehicleSearchAutocomplete {
    constructor(containerId, onSelectionChange = null) {
        this.container = document.getElementById(containerId);
        this.onSelectionChange = onSelectionChange;
        this.selectedVehicle = null;
        this.isManualMode = false;
        
        this.init();
    }
    
    init() {
        this.createSearchInterface();
        this.bindEvents();
    }
    
    createSearchInterface() {
        this.container.innerHTML = `
            <div class="vehicle-search-container">
                <div class="search-filters" style="display: flex; gap: 16px; margin-bottom: 16px; flex-wrap: wrap;">
                    <div class="filter-group">
                        <label for="year-filter">Year</label>
                        <select id="year-filter" class="filter-dropdown">
                            <option value="">All Years</option>
                            <option value="2025">2025</option>
                            <option value="2024">2024</option>
                            <option value="2023">2023</option>
                            <option value="2022">2022</option>
                            <option value="2021">2021</option>
                            <option value="2020">2020</option>
                        </select>
                    </div>
                    
                    <div class="filter-group">
                        <label for="fuel-filter">Fuel Type</label>
                        <select id="fuel-filter" class="filter-dropdown">
                            <option value="">All Fuel Types</option>
                            <option value="electric">⚡ Electric</option>
                            <option value="hybrid">🔋 Hybrid</option>
                            <option value="petrol">⛽ Petrol</option>
                            <option value="diesel">🛢️ Diesel</option>
                        </select>
                    </div>
                    
                    <div class="filter-group">
                        <label for="price-filter">Price Range</label>
                        <select id="price-filter" class="filter-dropdown">
                            <option value="">All Prices</option>
                            <option value="0-30000">Under €30,000</option>
                            <option value="30000-50000">€30,000 - €50,000</option>
                            <option value="50000-75000">€50,000 - €75,000</option>
                            <option value="75000-100000">€75,000 - €100,000</option>
                            <option value="100000-999999">Above €100,000</option>
                        </select>
                    </div>
                </div>
                
                <div class="input-group" style="position: relative;">
                    <label for="vehicle-search-input">Search Vehicle</label>
                    <input type="text" 
                           id="vehicle-search-input" 
                           class="vehicle-search-input" 
                           placeholder="Type to search... (e.g., BMW X1, Mercedes C200, Audi Q5)"
                           autocomplete="off">
                    <div id="vehicle-search-results" class="vehicle-search-results" style="display: none;"></div>
                </div>
                
                <div class="manual-override" style="margin-top: 16px;">
                    <label>
                        <input type="checkbox" id="manual-override-checkbox">
                        <span style="margin-left: 8px; font-size: 0.9rem; color: #6c757d;">Enter vehicle details manually</span>
                    </label>
                </div>
                
                <div id="manual-fields" class="manual-fields" style="display: none; margin-top: 16px;">
                    <div class="input-row">
                        <div class="input-group">
                            <label for="manual-name">Vehicle Name</label>
                            <input type="text" id="manual-name" placeholder="e.g., Tesla Model 3">
                        </div>
                        
                        <div class="input-group">
                            <label for="manual-price">List Price (€)</label>
                            <input type="number" id="manual-price" placeholder="50000" min="15000" max="200000">
                        </div>
                        
                        <div class="input-group">
                            <label for="manual-co2">CO2 Emissions (g/km)</label>
                            <input type="number" id="manual-co2" placeholder="120" min="0" max="300">
                        </div>
                        
                        <div class="input-group">
                            <label for="manual-fuel">Fuel Type</label>
                            <select id="manual-fuel">
                                <option value="electric">Electric</option>
                                <option value="petrol">Petrol</option>
                                <option value="diesel">Diesel</option>
                                <option value="hybrid">Hybrid</option>
                            </select>
                        </div>
                    </div>
                </div>
                
                <div class="selected-vehicle-info" id="selected-vehicle-info" style="display: none; margin-top: 16px; padding: 16px; background: #f8f9fa; border-radius: 6px;">
                    <h4 style="margin-bottom: 12px; font-size: 0.95rem; font-weight: 500; color: #28a745;">✓ Selected Vehicle:</h4>
                    <div id="vehicle-details"></div>
                </div>
            </div>
        `;
    }
    
    bindEvents() {
        const searchInput = document.getElementById('vehicle-search-input');
        const resultsContainer = document.getElementById('vehicle-search-results');
        const manualCheckbox = document.getElementById('manual-override-checkbox');
        const manualFields = document.getElementById('manual-fields');
        
        // Search input
        searchInput.addEventListener('input', (e) => {
            this.performSearch(e.target.value);
        });
        
        // Filter dropdowns
        const yearFilter = document.getElementById('year-filter');
        const fuelFilter = document.getElementById('fuel-filter');
        const priceFilter = document.getElementById('price-filter');
        
        [yearFilter, fuelFilter, priceFilter].forEach(filter => {
            filter.addEventListener('change', () => {
                this.performSearch(searchInput.value);
            });
        });
        
        // Result selection
        resultsContainer.addEventListener('click', (e) => {
            const resultItem = e.target.closest('.search-result-item');
            if (resultItem) {
                const index = parseInt(resultItem.getAttribute('data-index'));
                this.selectResult(index);
            }
        });
        
        // Hide results when clicking outside
        document.addEventListener('click', (e) => {
            if (!searchInput.contains(e.target) && !resultsContainer.contains(e.target)) {
                this.hideResults();
            }
        });
        
        // Manual override toggle
        manualCheckbox.addEventListener('change', (e) => {
            this.isManualMode = e.target.checked;
            
            if (this.isManualMode) {
                manualFields.style.display = 'block';
                searchInput.disabled = true;
                searchInput.style.background = '#f8f9fa';
                this.hideResults();
                this.hideSelectedInfo();
            } else {
                manualFields.style.display = 'none';
                searchInput.disabled = false;
                searchInput.style.background = 'white';
                this.updateSelectedVehicleInfo();
            }
        });
        
        // Manual field changes
        const manualFieldIds = ['manual-name', 'manual-price', 'manual-co2', 'manual-fuel'];
        manualFieldIds.forEach(fieldId => {
            const field = document.getElementById(fieldId);
            if (field) {
                field.addEventListener('input', () => {
                    this.notifySelectionChange();
                });
            }
        });
    }
    
    performSearch(searchTerm) {
        const filters = this.getActiveFilters();
        const results = VehicleSearchDB.smartSearchWithFilters(searchTerm, filters, 12);
        this.displayResults(results);
    }
    
    getActiveFilters() {
        return {
            year: document.getElementById('year-filter')?.value || '',
            fuel: document.getElementById('fuel-filter')?.value || '',
            priceRange: document.getElementById('price-filter')?.value || ''
        };
    }
    
    selectResult(index) {
        if (!this.currentResults || !this.currentResults[index]) {
            return;
        }
        
        const selectedVehicle = this.currentResults[index];
        this.selectedVehicle = selectedVehicle;
        
        // Update search input with selected vehicle
        const searchInput = document.getElementById('vehicle-search-input');
        searchInput.value = `${selectedVehicle.brand} ${selectedVehicle.model} ${selectedVehicle.variant.name} (${selectedVehicle.year})`;
        
        this.hideResults();
        this.updateSelectedVehicleInfo();
        this.notifySelectionChange();
        
        // Add the selected vehicle to the car list
        if (window.addSelectedVehicle) {
            window.addSelectedVehicle();
        }
    }
    
    
    displayResults(results) {
        const resultsContainer = document.getElementById('vehicle-search-results');
        this.currentResults = results; // Store for selection
        
        if (results.length === 0) {
            this.hideResults();
            return;
        }
        
        let html = '';
        results.forEach((result, index) => {
            const variant = result.variant;
            const co2Badge = variant.co2 === 0 ? 
                '<span style="background: #d1fae5; color: #065f46; padding: 2px 6px; border-radius: 3px; font-size: 0.75rem; margin-left: 8px;">0g CO₂</span>' :
                '';
            
            html += `
                <div class="search-result-item" data-index="${index}">
                    <div class="result-main">
                        <strong>${result.brand} ${result.model}</strong>
                        <span class="result-variant">${variant.name}</span>
                        <span class="result-year">(${result.year})</span>
                        ${co2Badge}
                    </div>
                    <div class="result-details">
                        €${variant.price.toLocaleString()} • ${variant.co2}g CO₂ • ${this.getFuelDisplay(variant.fuel)} • ${variant.power}hp
                    </div>
                </div>
            `;
        });
        
        resultsContainer.innerHTML = html;
        resultsContainer.style.display = 'block';
        
        // Bind click events
        resultsContainer.querySelectorAll('.search-result-item').forEach((item, index) => {
            item.addEventListener('click', () => {
                this.selectVehicle(results[index]);
            });
        });
    }
    
    selectVehicle(result) {
        const searchInput = document.getElementById('vehicle-search-input');
        const vehicleName = `${result.brand} ${result.model} ${result.variant.name} (${result.year})`;
        
        searchInput.value = vehicleName;
        this.selectedVehicle = {
            name: vehicleName,
            price: result.variant.price,
            co2: result.variant.co2,
            fuel: result.variant.fuel,
            power: result.variant.power,
            brand: result.brand,
            model: result.model,
            year: result.year,
            variant: result.variant
        };
        
        this.hideResults();
        this.updateSelectedVehicleInfo();
        this.notifySelectionChange();
    }
    
    hideResults() {
        document.getElementById('vehicle-search-results').style.display = 'none';
    }
    
    updateSelectedVehicleInfo() {
        const infoDiv = document.getElementById('selected-vehicle-info');
        const detailsDiv = document.getElementById('vehicle-details');
        
        if (this.isManualMode || !this.selectedVehicle) {
            infoDiv.style.display = 'none';
            return;
        }
        
        const vehicle = this.selectedVehicle;
        const variant = vehicle.variant;
        const fuelBadge = variant.fuel === 'electric' ? 
            '<span style="background: #d1fae5; color: #065f46; padding: 2px 6px; border-radius: 3px; font-size: 0.75rem;">Electric</span>' :
            variant.fuel === 'hybrid' ?
            '<span style="background: #fef3c7; color: #92400e; padding: 2px 6px; border-radius: 3px; font-size: 0.75rem;">Hybrid</span>' :
            `<span style="background: #f3f4f6; color: #374151; padding: 2px 6px; border-radius: 3px; font-size: 0.75rem;">${this.getFuelDisplay(variant.fuel)}</span>`;
        
        detailsDiv.innerHTML = `
            <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; font-size: 0.9rem;">
                <div><strong>Brand:</strong> ${vehicle.brand}</div>
                <div><strong>Model:</strong> ${vehicle.model}</div>
                <div><strong>Year:</strong> ${vehicle.year}</div>
                <div><strong>Price:</strong> €${variant.price.toLocaleString()}</div>
                <div><strong>CO₂:</strong> ${variant.co2}g/km</div>
                <div><strong>Fuel:</strong> ${fuelBadge}</div>
                <div><strong>Power:</strong> ${variant.power}hp</div>
                <div><strong>Variant:</strong> ${variant.name}</div>
            </div>
        `;
        infoDiv.style.display = 'block';
    }
    
    hideSelectedInfo() {
        document.getElementById('selected-vehicle-info').style.display = 'none';
    }
    
    getFuelDisplay(fuelType) {
        const fuelMap = {
            electric: 'Electric',
            petrol: 'Petrol',
            diesel: 'Diesel',
            hybrid: 'Hybrid'
        };
        return fuelMap[fuelType] || fuelType;
    }
    
    getSelectedVehicleData() {
        if (this.isManualMode) {
            return {
                name: document.getElementById('manual-name').value,
                price: parseFloat(document.getElementById('manual-price').value) || 0,
                co2: parseInt(document.getElementById('manual-co2').value) || 0,
                fuel: document.getElementById('manual-fuel').value
            };
        }
        
        return this.selectedVehicle;
    }
    
    notifySelectionChange() {
        if (this.onSelectionChange) {
            const vehicleData = this.getSelectedVehicleData();
            this.onSelectionChange(vehicleData);
        }
    }
    
    reset() {
        // Clear search input
        document.getElementById('vehicle-search-input').value = '';
        document.getElementById('vehicle-search-input').disabled = false;
        document.getElementById('vehicle-search-input').style.background = 'white';
        
        // Reset manual mode
        document.getElementById('manual-override-checkbox').checked = false;
        document.getElementById('manual-fields').style.display = 'none';
        this.isManualMode = false;
        
        // Clear manual fields
        document.getElementById('manual-name').value = '';
        document.getElementById('manual-price').value = '';
        document.getElementById('manual-co2').value = '';
        document.getElementById('manual-fuel').value = 'electric';
        
        // Clear selected vehicle
        this.selectedVehicle = null;
        
        this.hideResults();
        this.hideSelectedInfo();
    }
    
    setVehicleData(vehicleData) {
        if (vehicleData.manual) {
            document.getElementById('manual-override-checkbox').checked = true;
            document.getElementById('manual-fields').style.display = 'block';
            document.getElementById('manual-name').value = vehicleData.name || '';
            document.getElementById('manual-price').value = vehicleData.price || '';
            document.getElementById('manual-co2').value = vehicleData.co2 || '';
            document.getElementById('manual-fuel').value = vehicleData.fuel || 'electric';
            
            this.isManualMode = true;
            document.getElementById('vehicle-search-input').disabled = true;
            document.getElementById('vehicle-search-input').style.background = '#f8f9fa';
        }
    }
}

// Enhanced Vehicle Database utilities for search
const VehicleSearchDB = {
    // Get all vehicles as flat array for easier searching
    getAllVehicles() {
        const allVehicles = [];
        
        Object.keys(vehicleDatabase).forEach(brand => {
            Object.keys(vehicleDatabase[brand]).forEach(model => {
                Object.keys(vehicleDatabase[brand][model]).forEach(year => {
                    vehicleDatabase[brand][model][year].forEach(variant => {
                        allVehicles.push({
                            brand,
                            model, 
                            year,
                            variant,
                            searchText: `${brand} ${model} ${variant.name} ${year}`.toLowerCase()
                        });
                    });
                });
            });
        });
        
        return allVehicles;
    },
    
    // Get popular suggestions for empty search
    getPopularSuggestions() {
        const popular = [
            // BMW best sellers
            {brand: "BMW", model: "X1", year: "2024", variantIndex: 0},
            {brand: "BMW", model: "3 Series", year: "2024", variantIndex: 0},
            
            // Mercedes popular
            {brand: "Mercedes-Benz", model: "C-Class", year: "2024", variantIndex: 0},
            {brand: "Mercedes-Benz", model: "GLC", year: "2024", variantIndex: 0},
            
            // Audi favorites  
            {brand: "Audi", model: "Q5", year: "2024", variantIndex: 0},
            {brand: "Audi", model: "Q3", year: "2024", variantIndex: 0},
            
            // VW popular
            {brand: "Volkswagen", model: "Tiguan", year: "2024", variantIndex: 0},
            {brand: "Volkswagen", model: "Golf", year: "2024", variantIndex: 1},
            
            // Tesla models
            {brand: "Tesla", model: "Model Y", year: "2024", variantIndex: 0},
            {brand: "Tesla", model: "Model 3", year: "2024", variantIndex: 0}
        ];
        
        return popular.map(item => {
            const variant = vehicleDatabase[item.brand][item.model][item.year][item.variantIndex];
            return {
                brand: item.brand,
                model: item.model,
                year: item.year,
                variant
            };
        }).filter(item => item.variant); // Filter out any missing variants
    },
    
    // Smart search with filters
    smartSearchWithFilters(searchTerm, filters = {}, limit = 12) {
        if (!searchTerm || searchTerm.length < 2) {
            return this.getPopularSuggestions(filters).slice(0, limit);
        }
        
        return this.smartSearch(searchTerm, filters, limit);
    },
    
    // Smart search with fuzzy matching
    smartSearch(searchTerm, filters = {}, limit = 12) {
        
        const term = searchTerm.toLowerCase();
        const results = [];
        
        Object.keys(vehicleDatabase).forEach(brand => {
            Object.keys(vehicleDatabase[brand]).forEach(model => {
                Object.keys(vehicleDatabase[brand][model]).forEach(year => {
                    vehicleDatabase[brand][model][year].forEach(variant => {
                        // Apply filters first
                        if (!this.passesFilters(variant, year, filters)) {
                            return;
                        }
                        
                        const searchText = `${brand} ${model} ${variant.name}`.toLowerCase();
                        const fullText = `${brand} ${model} ${variant.name} ${year}`.toLowerCase();
                        
                        let score = 0;
                        
                        // Brand exact match
                        if (brand.toLowerCase() === term) score += 1000;
                        else if (brand.toLowerCase().includes(term)) score += 500;
                        
                        // Model exact match
                        if (model.toLowerCase() === term) score += 800;
                        else if (model.toLowerCase().includes(term)) score += 400;
                        
                        // Variant name match
                        if (variant.name.toLowerCase().includes(term)) score += 300;
                        
                        // Full text contains term
                        if (fullText.includes(term)) score += 100;
                        
                        // Partial brand + model match (e.g., "bmw x1")
                        const brandModel = `${brand} ${model}`.toLowerCase();
                        if (brandModel.includes(term)) score += 600;
                        
                        // Year preference (newer = better)
                        score += parseInt(year) * 0.1;
                        
                        // Electric/hybrid bonus for environmental preference
                        if (variant.fuel === 'electric') score += 50;
                        if (variant.fuel === 'hybrid') score += 25;
                        
                        if (score > 0) {
                            results.push({
                                brand,
                                model,
                                year,
                                variant,
                                score
                            });
                        }
                    });
                });
            });
        });
        
        return results.sort((a, b) => b.score - a.score).slice(0, limit);
    },
    
    // Check if vehicle passes all active filters
    passesFilters(variant, year, filters) {
        // Year filter
        if (filters.year && year !== filters.year) {
            return false;
        }
        
        // Fuel type filter
        if (filters.fuel && variant.fuel !== filters.fuel) {
            return false;
        }
        
        // Price range filter
        if (filters.priceRange && variant.price) {
            const [minPrice, maxPrice] = filters.priceRange.split('-').map(Number);
            if (variant.price < minPrice || variant.price > maxPrice) {
                return false;
            }
        }
        
        return true;
    },
    
    // Get popular suggestions with filters applied
    getPopularSuggestions(filters = {}) {
        const popular = [
            // BMW best sellers
            {brand: "BMW", model: "X1", year: "2024", variantIndex: 0},
            {brand: "BMW", model: "3 Series", year: "2024", variantIndex: 0},
            
            // Mercedes popular
            {brand: "Mercedes-Benz", model: "C-Class", year: "2024", variantIndex: 0},
            {brand: "Mercedes-Benz", model: "GLC", year: "2024", variantIndex: 0},
            
            // Audi favorites  
            {brand: "Audi", model: "Q5", year: "2024", variantIndex: 0},
            {brand: "Audi", model: "Q3", year: "2024", variantIndex: 0},
            
            // VW popular
            {brand: "Volkswagen", model: "Tiguan", year: "2024", variantIndex: 0},
            {brand: "Volkswagen", model: "Golf", year: "2024", variantIndex: 1},
            
            // Tesla models
            {brand: "Tesla", model: "Model Y", year: "2024", variantIndex: 0},
            {brand: "Tesla", model: "Model 3", year: "2024", variantIndex: 0}
        ];
        
        return popular.map(item => {
            if (!vehicleDatabase[item.brand] || !vehicleDatabase[item.brand][item.model] || !vehicleDatabase[item.brand][item.model][item.year]) {
                return null;
            }
            
            const variant = vehicleDatabase[item.brand][item.model][item.year][item.variantIndex];
            if (!variant) return null;
            
            // Apply filters to popular suggestions too
            if (!this.passesFilters(variant, item.year, filters)) {
                return null;
            }
            
            return {
                brand: item.brand,
                model: item.model,
                year: item.year,
                variant
            };
        }).filter(item => item !== null); // Filter out any missing variants
    }
};

// Utility functions for integration with existing tax calculator
const VehicleAutocompleteUtils = {
    // Convert autocomplete selection to legacy custom car format
    convertToCustomCar(vehicleData) {
        // Handle both data structures: manual mode (flat) and search mode (nested)
        let name, price, co2, fuel;
        
        if (vehicleData.variant) {
            // Search mode: {brand, model, year, variant}
            const variant = vehicleData.variant;
            name = `${vehicleData.brand} ${vehicleData.model} ${variant.name} (${vehicleData.year})`;
            price = variant.price;
            co2 = variant.co2;
            fuel = variant.fuel;
        } else {
            // Manual mode: {name, price, co2, fuel}
            name = vehicleData.name;
            price = vehicleData.price;
            co2 = vehicleData.co2;
            fuel = vehicleData.fuel;
        }
        
        return {
            name,
            price,
            co2,
            fuel,
            examples: vehicleData.variant ? "Selected from database" : "Manual entry"
        };
    },
    
    // Validate vehicle data before adding
    validateVehicleData(vehicleData) {
        if (!vehicleData) {
            return {
                valid: false,
                message: "Please select a vehicle or enter all required fields"
            };
        }
        
        // Handle both data structures: manual mode (flat) and search mode (nested)
        let name, price, co2, fuel;
        
        if (vehicleData.variant) {
            // Search mode: {brand, model, year, variant}
            const variant = vehicleData.variant;
            name = `${vehicleData.brand} ${vehicleData.model} ${variant.name} (${vehicleData.year})`;
            price = variant.price;
            co2 = variant.co2;
            fuel = variant.fuel;
        } else {
            // Manual mode: {name, price, co2, fuel}
            name = vehicleData.name;
            price = vehicleData.price;
            co2 = vehicleData.co2;
            fuel = vehicleData.fuel;
        }
        
        if (!name || !price) {
            return {
                valid: false,
                message: "Please select a vehicle or enter all required fields"
            };
        }
        
        if (price < 15000 || price > 200000) {
            return {
                valid: false,
                message: "Price must be between €15,000 and €200,000"
            };
        }
        
        if (co2 < 0 || co2 > 300) {
            return {
                valid: false,
                message: "CO2 emissions must be between 0 and 300 g/km"
            };
        }
        
        return { valid: true };
    },
    
    // Get fuel type display name
    getFuelTypeDisplay(fuelType, language = 'en') {
        const fuelTypes = {
            en: {
                electric: "Electric",
                petrol: "Petrol", 
                diesel: "Diesel",
                hybrid: "Hybrid"
            },
            fr: {
                electric: "Électrique",
                petrol: "Essence",
                diesel: "Diesel", 
                hybrid: "Hybride"
            },
            nl: {
                electric: "Elektrisch",
                petrol: "Benzine",
                diesel: "Diesel",
                hybrid: "Hybride"
            }
        };
        
        return fuelTypes[language][fuelType] || fuelType;
    }
};