/**
 * CV Generator - JavaScript
 * Gère le formulaire multi-étapes et l'interaction avec l'API
 */

// Configuration
const API_BASE_URL = window.location.origin + '/api/cv';
let currentStep = 1;
const totalSteps = 5;

// ========================================
// Navigation entre les étapes
// ========================================

function updateProgress() {
    const progress = ((currentStep - 1) / (totalSteps - 1)) * 100;
    document.getElementById('progress').style.width = `${progress}%`;
    
    // Mettre à jour les indicateurs d'étapes
    document.querySelectorAll('.step').forEach((step, index) => {
        const stepNum = index + 1;
        step.classList.remove('active', 'completed');
        
        if (stepNum < currentStep) {
            step.classList.add('completed');
        } else if (stepNum === currentStep) {
            step.classList.add('active');
        }
    });
}

function showStep(step) {
    document.querySelectorAll('.form-step').forEach(el => {
        el.classList.remove('active');
    });
    document.getElementById(`step-${step}`).classList.add('active');
    
    // Gérer les boutons de navigation
    document.getElementById('prev-btn').style.display = step === 1 ? 'none' : 'block';
    document.getElementById('next-btn').style.display = step === totalSteps ? 'none' : 'block';
    
    // Mettre à jour le preview à l'étape finale
    if (step === totalSteps) {
        updatePreview();
    }
    
    updateProgress();
}

function nextStep() {
    // Valider l'étape actuelle avant de passer à la suivante
    if (!validateCurrentStep()) {
        return;
    }
    
    if (currentStep < totalSteps) {
        currentStep++;
        showStep(currentStep);
        window.scrollTo({ top: 0, behavior: 'smooth' });
    }
}

function prevStep() {
    if (currentStep > 1) {
        currentStep--;
        showStep(currentStep);
        window.scrollTo({ top: 0, behavior: 'smooth' });
    }
}

// ========================================
// Validation
// ========================================

function validateCurrentStep() {
    const currentStepEl = document.getElementById(`step-${currentStep}`);
    const requiredFields = currentStepEl.querySelectorAll('[required]');
    let isValid = true;
    
    requiredFields.forEach(field => {
        if (!field.value.trim()) {
            field.style.borderColor = '#ef4444';
            isValid = false;
        } else {
            field.style.borderColor = '#e2e8f0';
        }
    });
    
    if (!isValid) {
        alert('Veuillez remplir tous les champs obligatoires.');
    }
    
    return isValid;
}

// ========================================
// Ajout dynamique d'entrées
// ========================================

function addEducation() {
    const container = document.getElementById('education-container');
    const newEntry = document.createElement('div');
    newEntry.className = 'entry-card education-entry';
    newEntry.innerHTML = `
        <button type="button" class="btn-remove" onclick="removeEntry(this)" style="position: absolute; top: 10px; right: 10px;">×</button>
        <div class="form-row">
            <div class="form-group">
                <label>Diplôme *</label>
                <input type="text" name="edu_degree[]" required placeholder="Master en Informatique">
            </div>
            <div class="form-group">
                <label>Établissement *</label>
                <input type="text" name="edu_institution[]" required placeholder="Université Paris-Saclay">
            </div>
        </div>
        <div class="form-row">
            <div class="form-group">
                <label>Date de début *</label>
                <input type="text" name="edu_start[]" required placeholder="Septembre 2018">
            </div>
            <div class="form-group">
                <label>Date de fin *</label>
                <input type="text" name="edu_end[]" required placeholder="Juin 2020">
            </div>
        </div>
        <div class="form-group">
            <label>Description (optionnel)</label>
            <textarea name="edu_description[]" rows="2" placeholder="Spécialisation, mentions, projets remarquables..."></textarea>
        </div>
    `;
    container.appendChild(newEntry);
}

function addExperience() {
    const container = document.getElementById('experience-container');
    const newEntry = document.createElement('div');
    newEntry.className = 'entry-card experience-entry';
    newEntry.innerHTML = `
        <button type="button" class="btn-remove" onclick="removeEntry(this)" style="position: absolute; top: 10px; right: 10px;">×</button>
        <div class="form-row">
            <div class="form-group">
                <label>Poste *</label>
                <input type="text" name="exp_title[]" required placeholder="Développeur Full Stack">
            </div>
            <div class="form-group">
                <label>Entreprise *</label>
                <input type="text" name="exp_company[]" required placeholder="Tech Company">
            </div>
        </div>
        <div class="form-row">
            <div class="form-group">
                <label>Date de début *</label>
                <input type="text" name="exp_start[]" required placeholder="Janvier 2021">
            </div>
            <div class="form-group">
                <label>Date de fin *</label>
                <input type="text" name="exp_end[]" required placeholder="Présent">
            </div>
        </div>
        <div class="form-group">
            <label>Description *</label>
            <textarea name="exp_description[]" rows="3" required placeholder="Décrivez vos missions et réalisations..."></textarea>
            <button type="button" class="btn-ai" onclick="enhanceExperience(this)">✨ Améliorer avec l'IA</button>
        </div>
    `;
    container.appendChild(newEntry);
}

function addSkill() {
    const container = document.getElementById('skills-container');
    const newEntry = document.createElement('div');
    newEntry.className = 'skill-entry form-row';
    newEntry.innerHTML = `
        <div class="form-group">
            <label>Compétence *</label>
            <input type="text" name="skill_name[]" required placeholder="Python">
        </div>
        <div class="form-group">
            <label>Niveau</label>
            <select name="skill_level[]">
                <option value="">-- Sélectionner --</option>
                <option value="Débutant">Débutant</option>
                <option value="Intermédiaire">Intermédiaire</option>
                <option value="Avancé">Avancé</option>
                <option value="Expert">Expert</option>
            </select>
        </div>
        <button type="button" class="btn-remove" onclick="removeEntry(this)">×</button>
    `;
    container.appendChild(newEntry);
}

function addLanguage() {
    const container = document.getElementById('languages-container');
    const newEntry = document.createElement('div');
    newEntry.className = 'language-entry form-row';
    newEntry.innerHTML = `
        <div class="form-group">
            <label>Langue *</label>
            <input type="text" name="lang_name[]" required placeholder="Anglais">
        </div>
        <div class="form-group">
            <label>Niveau *</label>
            <select name="lang_level[]" required>
                <option value="">-- Sélectionner --</option>
                <option value="Natif">Natif</option>
                <option value="langage maternelle">langage maternelle</option>
                <option value="C2 - Maîtrise">C2 - Maîtrise</option>
                <option value="C1 - Autonome">C1 - Autonome</option>
                <option value="B2 - Indépendant">B2 - Indépendant</option>
                <option value="B1 - Seuil">B1 - Seuil</option>
                <option value="A2 - Élémentaire">A2 - Élémentaire</option>
                <option value="A1 - Découverte">A1 - Découverte</option>
            </select>
        </div>
        <button type="button" class="btn-remove" onclick="removeEntry(this)">×</button>
    `;
    container.appendChild(newEntry);
}

function removeEntry(button) {
    const entry = button.closest('.entry-card, .skill-entry, .language-entry');
    entry.remove();
}

// ========================================
// Collecte des données du formulaire
// ========================================

function collectFormData() {
    // Informations personnelles
    const personalInfo = {
        full_name: document.getElementById('full_name').value,
        email: document.getElementById('email').value,
        phone: document.getElementById('phone').value,
        address: document.getElementById('address').value,
        linkedin: document.getElementById('linkedin').value || null,
        portfolio: document.getElementById('portfolio').value || null,
        summary: document.getElementById('summary').value || null
    };
    
    // Formation
    const education = [];
    const eduDegrees = document.getElementsByName('edu_degree[]');
    const eduInstitutions = document.getElementsByName('edu_institution[]');
    const eduStarts = document.getElementsByName('edu_start[]');
    const eduEnds = document.getElementsByName('edu_end[]');
    const eduDescriptions = document.getElementsByName('edu_description[]');
    
    for (let i = 0; i < eduDegrees.length; i++) {
        if (eduDegrees[i].value) {
            education.push({
                degree: eduDegrees[i].value,
                institution: eduInstitutions[i].value,
                start_date: eduStarts[i].value,
                end_date: eduEnds[i].value,
                description: eduDescriptions[i].value || null
            });
        }
    }
    
    // Expériences
    const experiences = [];
    const expTitles = document.getElementsByName('exp_title[]');
    const expCompanies = document.getElementsByName('exp_company[]');
    const expStarts = document.getElementsByName('exp_start[]');
    const expEnds = document.getElementsByName('exp_end[]');
    const expDescriptions = document.getElementsByName('exp_description[]');
    
    for (let i = 0; i < expTitles.length; i++) {
        if (expTitles[i].value) {
            experiences.push({
                job_title: expTitles[i].value,
                company: expCompanies[i].value,
                start_date: expStarts[i].value,
                end_date: expEnds[i].value,
                description: expDescriptions[i].value
            });
        }
    }
    
    // Compétences
    const skills = [];
    const skillNames = document.getElementsByName('skill_name[]');
    const skillLevels = document.getElementsByName('skill_level[]');
    
    for (let i = 0; i < skillNames.length; i++) {
        if (skillNames[i].value) {
            skills.push({
                name: skillNames[i].value,
                level: skillLevels[i].value || null
            });
        }
    }
    
    // Langues
    const languages = [];
    const langNames = document.getElementsByName('lang_name[]');
    const langLevels = document.getElementsByName('lang_level[]');
    
    for (let i = 0; i < langNames.length; i++) {
        if (langNames[i].value) {
            languages.push({
                name: langNames[i].value,
                level: langLevels[i].value
            });
        }
    }
    
    // Hobbies
    const hobbiesInput = document.getElementById('hobbies').value;
    const hobbies = hobbiesInput ? hobbiesInput.split(',').map(h => h.trim()).filter(h => h) : null;
    
    return {
        personal_info: personalInfo,
        education: education,
        experiences: experiences,
        skills: skills,
        languages: languages,
        hobbies: hobbies
    };
}

// ========================================
// Preview
// ========================================

function updatePreview() {
    const data = collectFormData();
    
    // Personal Info
    const personalHtml = `
        <div class="preview-item"><strong>Nom:</strong> ${data.personal_info.full_name}</div>
        <div class="preview-item"><strong>Email:</strong> ${data.personal_info.email}</div>
        <div class="preview-item"><strong>Téléphone:</strong> ${data.personal_info.phone}</div>
        <div class="preview-item"><strong>Adresse:</strong> ${data.personal_info.address}</div>
        ${data.personal_info.linkedin ? `<div class="preview-item"><strong>LinkedIn:</strong> ${data.personal_info.linkedin}</div>` : ''}
        ${data.personal_info.summary ? `<div class="preview-item"><strong>Résumé:</strong> ${data.personal_info.summary}</div>` : '<div class="preview-item"><em>Le résumé sera généré par l\'IA</em></div>'}
    `;
    document.getElementById('preview-personal').innerHTML = personalHtml;
    
    // Education
    const educationHtml = data.education.map(edu => `
        <div class="preview-item">
            <strong>${edu.degree}</strong> - ${edu.institution}<br>
            <small>${edu.start_date} - ${edu.end_date}</small>
        </div>
    `).join('');
    document.getElementById('preview-education').innerHTML = educationHtml || '<em>Aucune formation ajoutée</em>';
    
    // Experience
    const experienceHtml = data.experiences.map(exp => `
        <div class="preview-item">
            <strong>${exp.job_title}</strong> - ${exp.company}<br>
            <small>${exp.start_date} - ${exp.end_date}</small>
        </div>
    `).join('');
    document.getElementById('preview-experience').innerHTML = experienceHtml || '<em>Aucune expérience ajoutée</em>';
    
    // Skills & Languages
    const skillsHtml = `
        <div class="preview-item"><strong>Compétences:</strong> ${data.skills.map(s => s.name).join(', ') || 'Aucune'}</div>
        <div class="preview-item"><strong>Langues:</strong> ${data.languages.map(l => `${l.name} (${l.level})`).join(', ') || 'Aucune'}</div>
        ${data.hobbies ? `<div class="preview-item"><strong>Centres d'intérêt:</strong> ${data.hobbies.join(', ')}</div>` : ''}
    `;
    document.getElementById('preview-skills').innerHTML = skillsHtml;
}

// ========================================
// IA Features
// ========================================

async function generateSummary() {
    const btn = document.querySelector('.btn-ai');
    btn.disabled = true;
    btn.textContent = '⏳ Génération...';
    
    try {
        const data = collectFormData();
        const response = await fetch(`${API_BASE_URL}/enhance-summary`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        });
        
        const result = await response.json();
        
        if (result.success) {
            document.getElementById('summary').value = result.summary;
        } else {
            alert('Erreur lors de la génération du résumé');
        }
    } catch (error) {
        console.error('Erreur:', error);
        alert('Erreur de connexion au serveur');
    } finally {
        btn.disabled = false;
        btn.textContent = '✨ Générer avec l\'IA';
    }
}

async function enhanceExperience(button) {
    const entry = button.closest('.entry-card');
    const textarea = entry.querySelector('textarea[name="exp_description[]"]');
    const titleInput = entry.querySelector('input[name="exp_title[]"]');
    
    if (!textarea.value.trim()) {
        alert('Veuillez d\'abord entrer une description à améliorer');
        return;
    }
    
    button.disabled = true;
    button.textContent = '⏳ Amélioration...';
    
    try {
        const response = await fetch(`${API_BASE_URL}/enhance-experience?description=${encodeURIComponent(textarea.value)}&job_title=${encodeURIComponent(titleInput.value)}`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            }
        });
        
        const result = await response.json();
        
        if (result.success) {
            textarea.value = result.enhanced_description;
        } else {
            alert('Erreur lors de l\'amélioration');
        }
    } catch (error) {
        console.error('Erreur:', error);
        alert('Erreur de connexion au serveur');
    } finally {
        button.disabled = false;
        button.textContent = '✨ Améliorer avec l\'IA';
    }
}

// ========================================
// Génération du CV
// ========================================

async function generateCV(event) {
    event.preventDefault();
    
    const generateBtn = document.getElementById('generate-btn');
    const loading = document.getElementById('loading');
    
    generateBtn.disabled = true;
    generateBtn.querySelector('.btn-text').classList.add('hidden');
    generateBtn.querySelector('.btn-loading').classList.remove('hidden');
    loading.classList.remove('hidden');
    
    try {
        const data = collectFormData();
        
        const response = await fetch(`${API_BASE_URL}/generate`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        });
        
        const result = await response.json();
        
        if (result.success) {
            showDownloadModal(result.message, result.file_path);
        } else {
            alert('Erreur: ' + (result.detail || result.message));
        }
    } catch (error) {
        console.error('Erreur:', error);
        alert('Erreur de connexion au serveur. Vérifiez que le backend est lancé.');
    } finally {
        generateBtn.disabled = false;
        generateBtn.querySelector('.btn-text').classList.remove('hidden');
        generateBtn.querySelector('.btn-loading').classList.add('hidden');
        loading.classList.add('hidden');
    }
}

// ========================================
// Modal
// ========================================

function showDownloadModal(message, filename) {
    const modal = document.getElementById('download-modal');
    const messageEl = document.getElementById('modal-message');
    const downloadLink = document.getElementById('download-link');
    
    messageEl.textContent = message;
    downloadLink.href = `${API_BASE_URL}/download/${filename}`;
    downloadLink.download = filename;
    
    modal.classList.remove('hidden');
}

function closeModal() {
    document.getElementById('download-modal').classList.add('hidden');
}

// ========================================
// Initialisation
// ========================================

document.addEventListener('DOMContentLoaded', function() {
    // Initialiser la première étape
    showStep(1);
    
    // Gérer la soumission du formulaire
    document.getElementById('cv-form').addEventListener('submit', generateCV);
    
    // Fermer le modal en cliquant à l'extérieur
    document.getElementById('download-modal').addEventListener('click', function(e) {
        if (e.target === this) {
            closeModal();
        }
    });
});