// ChronoBirth Magic - Interactive Birth Date Form

// ==================== CONFIGURATION ====================

const CONFIG = {
    zodiacSigns: [
        { name: 'Capricorn', symbol: '♑', element: 'Earth', start: [12, 22], end: [1, 19] },
        { name: 'Aquarius', symbol: '♒', element: 'Air', start: [1, 20], end: [2, 18] },
        { name: 'Pisces', symbol: '♓', element: 'Water', start: [2, 19], end: [3, 20] },
        { name: 'Aries', symbol: '♈', element: 'Fire', start: [3, 21], end: [4, 19] },
        { name: 'Taurus', symbol: '♉', element: 'Earth', start: [4, 20], end: [5, 20] },
        { name: 'Gemini', symbol: '♊', element: 'Air', start: [5, 21], end: [6, 20] },
        { name: 'Cancer', symbol: '♋', element: 'Water', start: [6, 21], end: [7, 22] },
        { name: 'Leo', symbol: '♌', element: 'Fire', start: [7, 23], end: [8, 22] },
        { name: 'Virgo', symbol: '♍', element: 'Earth', start: [8, 23], end: [9, 22] },
        { name: 'Libra', symbol: '♎', element: 'Air', start: [9, 23], end: [10, 22] },
        { name: 'Scorpio', symbol: '♏', element: 'Water', start: [10, 23], end: [11, 21] },
        { name: 'Sagittarius', symbol: '♐', element: 'Fire', start: [11, 22], end: [12, 21] }
    ],
    seasons: [
        { name: 'Spring', start: [3, 20], end: [6, 20], icon: '🌸' },
        { name: 'Summer', start: [6, 21], end: [9, 22], icon: '☀️' },
        { name: 'Autumn', start: [9, 23], end: [12, 20], icon: '🍂' },
        { name: 'Winter', start: [12, 21], end: [3, 19], icon: '❄️' }
    ],
    dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
};

// ==================== STATE ====================

let currentStep = 1;
const totalSteps = 3;
let birthData = {
    day: null,
    month: null,
    year: null,
    time: null,
    timezone: 'UTC'
};

// ==================== DOM ELEMENTS ====================

const elements = {
    form: document.getElementById('birthForm'),
    formCard: document.getElementById('birthFormCard'),
    resultsCard: document.getElementById('resultsCard'),
    prevBtn: document.getElementById('prevBtn'),
    nextBtn: document.getElementById('nextBtn'),
    submitBtn: document.getElementById('submitBtn'),
    themeToggle: document.getElementById('themeToggle'),
    toast: document.getElementById('toast'),
    confettiCanvas: document.getElementById('confettiCanvas')
};

// ==================== INITIALIZATION ====================

document.addEventListener('DOMContentLoaded', () => {
    initializeEventListeners();
    initializeTheme();
    updateStepIndicators();
    feather.replace();
});

// ==================== EVENT LISTENERS ====================

function initializeEventListeners() {
    // Navigation
    elements.nextBtn.addEventListener('click', nextStep);
    elements.prevBtn.addEventListener('click', prevStep);
    elements.form.addEventListener('submit', handleSubmit);
    
    // Theme
    elements.themeToggle.addEventListener('click', toggleTheme);
    
    // Preset buttons
    document.querySelectorAll('.preset-btn').forEach(btn => {
        btn.addEventListener('click', () => applyPreset(btn.dataset.preset));
    });
    
    // Input validation and auto-advance
    ['day', 'month', 'year'].forEach(id => {
        const input = document.getElementById(id);
        input.addEventListener('input', handleDateInput);
        input.addEventListener('blur', validateDate);
    });
    
    // Reset
    document.getElementById('resetBtn').addEventListener('click', resetForm);
    
    // Share & Save
    document.getElementById('shareBtn').addEventListener('click', shareResults);
    document.getElementById('saveBtn').addEventListener('click', saveResults);
}

// ==================== THEME ====================

function initializeTheme() {
    const savedTheme = localStorage.getItem('chronobirth-theme');
    const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
    
    if (savedTheme === 'dark' || (!savedTheme && prefersDark)) {
        document.documentElement.classList.add('dark');
    }
}

function toggleTheme() {
    const isDark = document.documentElement.classList.toggle('dark');
    localStorage.setItem('chronobirth-theme', isDark ? 'dark' : 'light');
    
    // Animate icon
    const icon = elements.themeToggle.querySelector('i');
    icon.style.transform = 'rotate(360deg)';
    setTimeout(() => {
        icon.style.transform = '';
        feather.replace();
    }, 300);
}

// ==================== STEP NAVIGATION ====================

function nextStep() {
    if (!validateCurrentStep()) return;
    
    if (currentStep < totalSteps) {
        goToStep(currentStep + 1);
    }
}

function prevStep() {
    if (currentStep > 1) {
        goToStep(currentStep - 1);
    }
}

function goToStep(step) {
    // Update form steps
    document.querySelectorAll('.form-step').forEach((el, i) => {
        el.classList.remove('active', 'prev');
        if (i + 1 === step) {
            el.classList.add('active');
        } else if (i + 1 < step) {
            el.classList.add('prev');
        }
    });
    
    currentStep = step;
    updateStepIndicators();
    updateNavigationButtons();
    
    // Update preview on step 3
    if (step === 3) {
        updateZodiacPreview();
    }
}

function updateStepIndicators() {
    document.querySelectorAll('.step-indicator').forEach((el, i) => {
        el.classList.remove('active', 'completed');
        if (i + 1 === currentStep) {
            el.classList.add('active');
        } else if (i + 1 < currentStep) {
            el.classList.add('completed');
            el.querySelector('.step-number').innerHTML = '<i data-feather="check" class="w-4 h-4"></i>';
            feather.replace();
        } else {
            el.querySelector('.step-number').textContent = i + 1;
        }
    });
}

function updateNavigationButtons() {
    elements.prevBtn.classList.toggle('hidden', currentStep === 1);
    elements.nextBtn.classList.toggle('hidden', currentStep === totalSteps);
    elements.submitBtn.classList.toggle('hidden', currentStep !== totalSteps);
}

function validateCurrentStep() {
    const currentStepEl = document.querySelector(`.form-step[data-step="${currentStep}"]`);
    const inputs = currentStepEl.querySelectorAll('input, select');
    
    let isValid = true;
    inputs.forEach(input => {
        if (!input.checkValidity()) {
            input.reportValidity();
            isValid = false;
        }
    });
    
    return isValid;
}

// ==================== INPUT HANDLING ====================

function handleDateInput(e) {
    const input = e.target;
    const value = input.value;
    
    // Auto-advance for day and month
    if (input.id === 'day' && value.length === 2) {
        document.getElementById('month').focus();
    } else if (input.id === 'year' && value.length === 4) {
        document.getElementById('time').focus();
    }
    
    // Store data
    birthData[input.id] = input.id === 'month' ? parseInt(value) : value;
}

function validateDate() {
    const day = parseInt(document.getElementById('day').value);
    const month = parseInt(document.getElementById('month').value);
    const year = parseInt(document.getElementById('year').value);
    
    if (!day || !month || !year) return;
    
    const date = new Date(year, month - 1, day);
    const isValid = date.getDate() === day && date.getMonth() === month - 1;
    
    if (!isValid) {
        showToast('Please enter a valid date!', 'error');
    }
}

function applyPreset(preset) {
    const now = new Date();
    const year = now.getFullYear();
    
    const presets = {
        today: { day: now.getDate(), month: now.getMonth() + 1, year: year },
        newyear: { day: 1, month: 1, year: year },
        leap: { day: 29, month: 2, year: 2020 },
        halloween: { day: 31, month: 10, year: year }
    };
    
    const data = presets[preset];
    if (data) {
        document.getElementById('day').value = data.day.toString().padStart(2, '0');
        document.getElementById('month').value = data.month;
        document.getElementById('year').value = data.year;
        
        birthData.day = data.day;
        birthData.month = data.month;
        birthData.year = data.year;
        
        // Visual feedback
        document.querySelectorAll('.preset-btn').forEach(btn => {
            btn.style.transform = btn.dataset.preset === preset ? 'scale(1.05)' : '';
            btn.style.background = btn.dataset.preset === preset ? '#fef2f2' : '';
        });
    }
}

// ==================== ZODIAC & CALCULATIONS ====================

function getZodiacSign(day, month) {
    for (const sign of CONFIG.zodiacSigns) {
        const [startMonth, startDay] = sign.start;
        const [endMonth, endDay] = sign.end;
        
        if ((month === startMonth && day >= startDay) || 
            (month === endMonth && day <= endDay) ||
            (startMonth > endMonth && (month === startMonth && day >= startDay || month === endMonth && day <= endDay))) {
            return sign;
        }
    }
    return CONFIG.zodiacSigns[0];
}

function getSeason(day, month) {
    for (const season of CONFIG.seasons) {
        const [startMonth, startDay] = season.start;
        const [endMonth, endDay] = season.end;
        
        const dateNum = month * 100 + day;
        const startNum = startMonth * 100 + startDay;
        const endNum = endMonth * 100 + endDay;
        
        if (startNum > endNum) {
            // Winter spans year boundary
            if (dateNum >= startNum || dateNum <= endNum) return season;
        } else {
            if (dateNum >= startNum && dateNum <= endNum) return season;
        }
    }
    return CONFIG.seasons[3]; // Default to winter
}

function calculateAge(birthDate) {
    const now = new Date();
    const diff = now - birthDate;
    
    const years = Math.floor(diff / (365.25 * 24 * 60 * 60 * 1000));
    const months = Math.floor((diff % (365.25 * 24 * 60 * 60 * 1000)) / (30.44 * 24 * 60 * 60 * 1000));
    const days = Math.floor((diff % (30.44 * 24 * 60 * 60 * 1000)) / (24 * 60 * 60 * 1000));
    const hours = Math.floor((diff % (24 * 60 * 60 * 1000)) / (60 * 60 * 1000));
    
    return { years, months, days, hours, totalDays: Math.floor(diff / (24 * 60 * 60 * 1000)) };
}

function getNextBirthday(birthDate) {
    const now = new Date();
    const currentYear = now.getFullYear();
    let nextBirthday = new Date(currentYear, birthDate.getMonth(), birthDate.getDate());
    
    if (nextBirthday < now) {
        nextBirthday.setFullYear(currentYear + 1);
    }
    
    const daysUntil = Math.ceil((nextBirthday - now) / (24 * 60 * 60 * 1000));
    return { date: nextBirthday, daysUntil };
}

function updateZodiacPreview() {
    const day = parseInt(document.getElementById('day').value);
    const month = parseInt(document.getElementById('month').value);
    const year = parseInt(document.getElementById('year').value);
    
    if (!day || !month || !year) return;
    
    const zodiac = getZodiacSign(day, month);
    const birthDate = new Date(year, month - 1, day);
    const dayOfWeek = CONFIG.dayNames[birthDate.getDay()];
    const age = calculateAge(birthDate);
    
    // Update preview
    document.getElementById('zodiacIcon').textContent = zodiac.symbol;
    document.getElementById('zodiacName').textContent = zodiac.name;
    document.getElementById('zodiacDates').textContent = `${zodiac.element} Element • ${zodiac.start[0]}/${zodiac.start[1]} - ${zodiac.end[0]}/${zodiac.end[1]}`;
    document.getElementById('dayOfWeek').textContent = dayOfWeek;
    document.getElementById('agePreview').textContent = `${age.years} years`;
    
    // Animate
    const preview = document.getElementById('zodiacPreview');
    preview.style.opacity = '1';
    preview.style.transform = 'scale(1.02)';
}

// ==================== FORM SUBMISSION ====================

function handleSubmit(e) {
    e.preventDefault();
    
    // Gather all data
    const day = parseInt(document.getElementById('day').value);
    const month = parseInt(document.getElementById('month').value);
    const year = parseInt(document.getElementById('year').value);
    const time = document.getElementById('time').value;
    const timezone = document.getElementById('timezone').value;
    
    const birthDate = new Date(year, month - 1, day);
    const zodiac = getZodiacSign(day, month);
    const season = getSeason(day, month);
    const age = calculateAge(birthDate);
    const nextBirthday = getNextBirthday(birthDate);
    
    // Calculate life progress (assuming 80 years)
    const lifeProgress = Math.min((age.years / 80) * 100, 100);
    
    // Display results
    displayResults({
        birthDate,
        day, month, year, time, timezone,
        zodiac,
        season,
        age,
        nextBirthday,
        lifeProgress,
        dayOfWeek: CONFIG.dayNames[birthDate.getDay()]
    });
}

function displayResults(data) {
    // Hide form, show results
    elements.formCard.style.display = 'none';
    elements.resultsCard.classList.remove('hidden');
    
    // Populate results
    document.getElementById('resultZodiacIcon').textContent = data.zodiac.symbol;
    document.getElementById('resultDate').textContent = `${data.dayOfWeek}, ${data.month}/${data.day}/${data.year}`;
    
    document.getElementById('resultZodiac').textContent = data.zodiac.name;
    document.getElementById('resultZodiacElement').textContent = `${data.zodiac.element} Element`;
    
    document.getElementById('resultAge').textContent = `${data.age.years} years`;
    document.getElementById('resultAgeDetailed').textContent = `${data.age.months}m ${data.age.days}d ${data.age.hours}h old`;
    
    document.getElementById('resultDayName').textContent = data.dayOfWeek;
    document.getElementById('resultDayType').textContent = getDayType(data.dayOfWeek);
    
    document.getElementById('resultNextBirthday').textContent = data.nextBirthday.date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
    document.getElementById('resultDaysUntil').textContent = `${data.nextBirthday.daysUntil} days until party time!`;
    
    document.getElementById('resultSeason').textContent = `${data.season.icon} ${data.season.name}`;
    document.getElementById('resultSeasonDates').textContent = getSeasonPeriod(data.season);
    
    // Animate progress bar
    setTimeout(() => {
        document.getElementById('lifeProgressBar').style.width = `${data.lifeProgress}%`;
    }, 300);
    document.getElementById('resultLifeProgress').textContent = `${data.lifeProgress.toFixed(1)}% of estimated lifespan`;
    
    // Generate fun facts
    generateFunFacts(data);
    
    // Trigger confetti
    triggerConfetti();
    
    // Scroll to top
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

function getDayType(day) {
    const types = {
        'Monday': 'Moon Day 🌙',
        'Tuesday': 'Mars Day ♂️',
        'Wednesday': 'Mercury Day ☿️',
        'Thursday': 'Jupiter Day ♃',
        'Friday': 'Venus Day ♀️',
        'Saturday': 'Saturn Day ♄',
        'Sunday': 'Sun Day ☉'
    };
    return types[day] || 'Special Day';
}

function getSeasonPeriod(season) {
    const [startM, startD] = season.start;
    const [endM, endD] = season.end;
    return `${startM}/${startD} - ${endM}/${endD}`;
}

function generateFunFacts(data) {
    const facts = [
        `You've been alive for approximately ${data.age.totalDays.toLocaleString()} days`,
        `Your heart has beaten about ${(data.age.totalDays * 115000).toLocaleString()} times`,
        `You've taken roughly ${(data.age.totalDays * 23000).toLocaleString()} breaths`,
        `The moon has orbited Earth ${Math.floor(data.age.years * 12.4)} times since you were born`,
        `Your zodiac sign ${data.zodiac.name} is known for being ${getZodiacTrait(data.zodiac.name)}`,
        `People born on ${data.dayOfWeek}s are said to be ${getDayTrait(data.dayOfWeek)}`
    ];
    
    // Add historical events
    const historicalEvents = getHistoricalEvents(data.year);
    facts.push(...historicalEvents);
    
    const list = document.getElementById('funFactsList');
    list.innerHTML = facts.map(fact => `
        <li class="flex items-start gap-3 text-slate-700 dark:text-slate-300">
            <span class="text-primary-500 mt-1">•</span>
            <span>${fact}</span>
        </li>
    `).join('');
}

function getZodiacTrait(sign) {
    const traits = {
        'Aries': 'bold and ambitious',
        'Taurus': 'reliable and patient',
        'Gemini': 'adaptable and outgoing',
        'Cancer': 'intuitive and sentimental',
        'Leo': 'confident and charismatic',
        'Virgo': 'analytical and hardworking',
        'Libra': 'diplomatic and gracious',
        'Scorpio': 'passionate and resourceful',
        'Sagittarius': 'generous and idealistic',
        'Capricorn': 'responsible and disciplined',
        'Aquarius': 'progressive and original',
        'Pisces': 'compassionate and artistic'
    };
    return traits[sign] || 'unique and special';
}

function getDayTrait(day) {
    const traits = {
        'Monday': 'creative and intuitive',
        'Tuesday': 'energetic and courageous',
        'Wednesday': 'communicative and curious',
        'Thursday': 'expansive and optimistic',
        'Friday': 'loving and harmonious',
        'Saturday': 'wise and disciplined',
        'Sunday': 'vital and radiant'
    };
    return traits[day] || 'wonderful';
}

function getHistoricalEvents(year) {
    const events = {
        2024: ['AI continues to transform technology', 'Space exploration reaches new heights'],
        2023: ['ChatGPT became widely popular', 'James Webb Space Telescope discoveries'],
        2020: ['COVID-19 pandemic changed the world', 'SpaceX launched first crewed mission'],
        2000: ['Y2K bug was avoided', 'Human genome project completed'],
        1990: ['World Wide Web was invented', 'Hubble Space Telescope launched'],
        1980: ['Pac-Man was released', 'CNN launched as first 24-hour news channel'],
        1970: ['First Earth Day celebrated', 'Floppy disk invented'],
        1969: ['Humans first landed on the Moon', 'Internet precursor ARPANET launched'],
        1960: ['Laser was invented', 'First weather satellite launched']
    };
    
    // Find closest year with events
    const years = Object.keys(events).map(Number).sort((a, b) => b - a);
    const closestYear = years.find(y => y <= year) || years[years.length - 1];
    
    return events[closestYear] ? events[closestYear].map(e => `In ${closestYear}: ${e}`) : [];
}

// ==================== ACTIONS ====================

function resetForm() {
    elements.form.reset();
    currentStep = 1;
    birthData = { day: null, month: null, year: null, time: null, timezone: 'UTC' };
    
    elements.resultsCard.classList.add('hidden');
    elements.formCard.style.display = 'block';
    
    document.getElementById('lifeProgressBar').style.width = '0%';
    
    goToStep(1);
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

async function shareResults() {
    const text = `I discovered my cosmic birthday profile with ChronoBirth! 🎂✨`;
    
    try {
        if (navigator.share) {
            await navigator.share({ title: 'My ChronoBirth Profile', text });
        } else {
            await navigator.clipboard.writeText(text + ' https://chronobirth.magic');
            showToast('Link copied to clipboard!');
        }
    } catch (err) {
        showToast('Unable to share', 'error');
    }
}

function saveResults() {
    // Create a simple text representation
    const results = document.getElementById('resultsCard').innerText;
    const blob = new Blob([results], { type: 'text/plain' });
    const url = URL.createObjectURL(blob);
    
    const a = document.createElement('a');
    a.href = url;
    a.download = 'my-chronobirth-profile.txt';
    a.click();
    
    URL.revokeObjectURL(url);
    showToast('Profile saved!');
}

function showToast(message, type = 'success') {
    const toast = elements.toast;
    const toastMessage = document.getElementById('toastMessage');
    
    toastMessage.textContent = message;
    toast.querySelector('i').className = type === 'error' 
        ? 'w-5 h-5 text-rose-500' 
        : 'w-5 h-5 text-emerald-400 dark:text-emerald-500';
    
    toast.style.transform = 'translateX(-50%) translateY(0)';
    toast.style.opacity = '1';
    
    setTimeout(() => {
        toast.style.transform = 'translateX(-50%) translateY(20px)';
        toast.style.opacity = '0';
    }, 3000);
}

// ==================== CONFETTI ====================

function triggerConfetti() {
    const canvas = elements.confettiCanvas;
    const ctx = canvas.getContext('2d');
    
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
    
    const particles = [];
    const colors = ['#ef4444', '#f59e0b', '#10b981', '#8b5cf6', '#ec4899', '#06b6d4'];
    
    // Create particles
    for (let i = 0; i < 150; i++) {
        particles.push({
            x: canvas.width / 2,
            y: canvas.height / 2,
            vx: (Math.random() - 0.5) * 15,
            vy: (Math.random() - 0.5) * 15 - 5,
            color: colors[Math.floor(Math.random() * colors.length)],
            size: Math.random() * 8 + 4,
            rotation: Math.random() * 360,
            rotationSpeed: (Math.random() - 0.5) * 10,
            gravity: 0.3,
            drag: 0.98
        });
    }
    
    let animationId;
    
    function animate() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        
        let activeParticles = 0;
        
        particles.forEach(p => {
            if (p.y < canvas.height + 50) {
                activeParticles++;
                
                p.x += p.vx;
                p.y += p.vy;
                p.vy += p.gravity;
                p.vx *= p.drag;
                p.vy *= p.drag;
                p.rotation += p.rotationSpeed;
                
                ctx.save();
                ctx.translate(p.x, p.y);
                ctx.rotate(p.rotation * Math.PI / 180);
                ctx.fillStyle = p.color;
                ctx.fillRect(-p.size / 2, -p.size / 2, p.size, p.size);
                ctx.restore();
            }
        });
        
        if (activeParticles > 0) {
            animationId = requestAnimationFrame(animate);
        } else {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
        }
    }
    
    animate();
    
    // Cleanup on resize
    window.addEventListener('resize', () => {
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
    }, { once: true });
}

// ==================== UTILITY ====================

// Add smooth scroll behavior
document.documentElement.style.scrollBehavior = 'smooth';

// Prevent form submission on Enter for multi-step
document.addEventListener('keydown', (e) => {
    if (e.key === 'Enter' && currentStep < totalSteps) {
        e.preventDefault();
        nextStep();
    }
});