// Postal Code Lookup Module
class PostalLookup {
    constructor() {
        this.form = document.getElementById('postal-form');
        this.input = document.getElementById('postal-code');
        this.refreshBtn = document.getElementById('refresh-btn');
        this.loadingDiv = document.getElementById('loading');
        this.errorDiv = document.getElementById('error-message');
        this.representativesSection = document.getElementById('representatives-section');
        this.locationDetails = document.getElementById('location-details');
        
        this.currentPostalCode = null;
        this.init();
    }

    init() {
        this.form.addEventListener('submit', (e) => this.handleSubmit(e));
        this.refreshBtn.addEventListener('click', () => this.handleRefresh());
        this.input.addEventListener('input', (e) => this.formatPostalCode(e));
    }

    formatPostalCode(e) {
        let value = e.target.value.toUpperCase().replace(/[^A-Z0-9]/g, '');
        
        // Format as A1A 1A1
        if (value.length > 3) {
            value = value.slice(0, 3) + ' ' + value.slice(3, 6);
        }
        
        e.target.value = value;
    }

    validatePostalCode(postalCode) {
        const cleaned = postalCode.replace(/\s/g, '');
        
        // Check format: Letter-Number-Letter Number-Letter-Number
        const regex = /^[A-Z]\d[A-Z]\d[A-Z]\d$/;
        if (!regex.test(cleaned)) {
            return { valid: false, message: 'Please enter a valid postal code format (A1A 1A1)' };
        }
        
        // Check if it's an Alberta postal code (starts with T)
        if (!cleaned.startsWith('T')) {
            return { valid: false, message: 'This tool is designed for Alberta postal codes only (starting with T)' };
        }
        
        return { valid: true };
    }

    showError(message) {
        this.errorDiv.textContent = message;
        this.errorDiv.style.display = 'block';
        this.representativesSection.style.display = 'none';
    }

    hideError() {
        this.errorDiv.style.display = 'none';
    }

    showLoading() {
        this.loadingDiv.style.display = 'block';
        this.hideError();
        this.representativesSection.style.display = 'none';
    }

    hideLoading() {
        this.loadingDiv.style.display = 'none';
    }

    async handleSubmit(e) {
        e.preventDefault();
        
        const postalCode = this.input.value.trim();
        if (!postalCode) {
            this.showError('Please enter a postal code');
            return;
        }

        const validation = this.validatePostalCode(postalCode);
        if (!validation.valid) {
            this.showError(validation.message);
            return;
        }

        await this.lookupRepresentatives(postalCode);
    }

    async handleRefresh() {
        if (!this.currentPostalCode) return;
        
        try {
            this.showLoading();
            this.refreshBtn.disabled = true;
            
            const data = await window.apiClient.refreshRepresentatives(this.currentPostalCode);
            this.displayResults(data);
            
            window.messageDisplay.show('Representatives data refreshed successfully!', 'success');
        } catch (error) {
            console.error('Refresh failed:', error);
            this.showError(`Failed to refresh data: ${error.message}`);
        } finally {
            this.hideLoading();
            this.refreshBtn.disabled = false;
        }
    }

    async lookupRepresentatives(postalCode) {
        try {
            this.showLoading();
            
            const data = await window.apiClient.getRepresentativesByPostalCode(postalCode);
            this.currentPostalCode = postalCode;
            this.displayResults(data);
            
        } catch (error) {
            console.error('Lookup failed:', error);
            this.showError(`Failed to find representatives: ${error.message}`);
        } finally {
            this.hideLoading();
        }
    }

    displayResults(apiResponse) {
        this.hideError();
        this.hideLoading();
        
        // Handle the API response structure
        const data = apiResponse.data || apiResponse; // Handle both new and old response formats
        
        // Update location info
        let locationText = `Postal Code: ${data.postalCode}`;
        if (data.location && data.location.city && data.location.province) {
            locationText += ` • ${data.location.city}, ${data.location.province}`;
        } else if (data.city && data.province) {
            locationText += ` • ${data.city}, ${data.province}`;
        }
        if (data.source || apiResponse.source) {
            locationText += ` • Pulled From: ${data.source || apiResponse.source}`;
        }
        this.locationDetails.textContent = locationText;
        
        // Show representatives
        const representatives = data.representatives || [];
        console.log('Displaying representatives:', representatives.length, representatives);
        window.representativesDisplay.displayRepresentatives(representatives);
        
        // Show section and refresh button
        this.representativesSection.style.display = 'block';
        this.refreshBtn.style.display = 'inline-block';
    }
}

// Initialize when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    window.postalLookup = new PostalLookup();
});