{% extends "base.html" %}

{% block title %}Create Schedule - SneakyScanner{% endblock %}

{% block content %}
<div class="row mt-4">
    <div class="col-12">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h1 style="color: #60a5fa;">Create Schedule</h1>
            <a href="{{ url_for('main.schedules') }}" class="btn btn-secondary">
                <i class="bi bi-arrow-left"></i> Back to Schedules
            </a>
        </div>
    </div>
</div>

<div class="row">
    <div class="col-lg-8">
        <form id="create-schedule-form">
            <!-- Basic Information Card -->
            <div class="card mb-4">
                <div class="card-header">
                    <h5 class="mb-0" style="color: #60a5fa;">Basic Information</h5>
                </div>
                <div class="card-body">
                    <!-- Schedule Name -->
                    <div class="mb-3">
                        <label for="schedule-name" class="form-label">Schedule Name <span class="text-danger">*</span></label>
                        <input type="text" class="form-control" id="schedule-name" name="name"
                               placeholder="e.g., Daily Infrastructure Scan"
                               required>
                        <small class="form-text text-muted">A descriptive name for this schedule</small>
                    </div>

                    <!-- Config File -->
                    <div class="mb-3">
                        <label for="config-file" class="form-label">Configuration File <span class="text-danger">*</span></label>
                        <select class="form-select" id="config-file" name="config_file" required>
                            <option value="">Select a configuration file...</option>
                            {% for config in config_files %}
                            <option value="{{ config }}">{{ config }}</option>
                            {% endfor %}
                        </select>
                        <small class="form-text text-muted">The scan configuration to use for this schedule</small>
                    </div>

                    <!-- Enable/Disable -->
                    <div class="mb-3">
                        <div class="form-check form-switch">
                            <input class="form-check-input" type="checkbox" id="schedule-enabled"
                                   name="enabled" checked>
                            <label class="form-check-label" for="schedule-enabled">
                                Enable schedule immediately
                            </label>
                        </div>
                        <small class="form-text text-muted">If disabled, the schedule will be created but not executed</small>
                    </div>
                </div>
            </div>

            <!-- Cron Expression Card -->
            <div class="card mb-4">
                <div class="card-header">
                    <h5 class="mb-0" style="color: #60a5fa;">Schedule Configuration</h5>
                </div>
                <div class="card-body">
                    <!-- Quick Templates -->
                    <div class="mb-3">
                        <label class="form-label">Quick Templates:</label>
                        <div class="btn-group-vertical btn-group-sm w-100" role="group">
                            <button type="button" class="btn btn-outline-secondary text-start" onclick="setCron('0 0 * * *')">
                                <strong>Daily at Midnight</strong> <code class="float-end">0 0 * * *</code>
                            </button>
                            <button type="button" class="btn btn-outline-secondary text-start" onclick="setCron('0 2 * * *')">
                                <strong>Daily at 2 AM</strong> <code class="float-end">0 2 * * *</code>
                            </button>
                            <button type="button" class="btn btn-outline-secondary text-start" onclick="setCron('0 */6 * * *')">
                                <strong>Every 6 Hours</strong> <code class="float-end">0 */6 * * *</code>
                            </button>
                            <button type="button" class="btn btn-outline-secondary text-start" onclick="setCron('0 0 * * 0')">
                                <strong>Weekly (Sunday at Midnight)</strong> <code class="float-end">0 0 * * 0</code>
                            </button>
                            <button type="button" class="btn btn-outline-secondary text-start" onclick="setCron('0 0 1 * *')">
                                <strong>Monthly (1st at Midnight)</strong> <code class="float-end">0 0 1 * *</code>
                            </button>
                        </div>
                    </div>

                    <!-- Manual Cron Entry -->
                    <div class="mb-3">
                        <label for="cron-expression" class="form-label">
                            Cron Expression <span class="text-danger">*</span>
                        </label>
                        <input type="text" class="form-control font-monospace" id="cron-expression"
                               name="cron_expression" placeholder="0 2 * * *"
                               oninput="validateCron()" required>
                        <small class="form-text text-muted">
                            Format: <code>minute hour day month weekday</code> (UTC timezone)
                        </small>
                    </div>

                    <!-- Cron Validation Feedback -->
                    <div id="cron-feedback" class="alert" style="display: none;"></div>

                    <!-- Human-Readable Description -->
                    <div id="cron-description-container" style="display: none;">
                        <div class="alert alert-info">
                            <strong>Description:</strong>
                            <div id="cron-description" class="mt-1"></div>
                        </div>
                    </div>

                    <!-- Next Run Times Preview -->
                    <div id="next-runs-container" style="display: none;">
                        <label class="form-label">Next 5 execution times (UTC):</label>
                        <ul id="next-runs-list" class="list-group">
                            <!-- Populated by JavaScript -->
                        </ul>
                    </div>
                </div>
            </div>

            <!-- Submit Buttons -->
            <div class="card">
                <div class="card-body">
                    <div class="d-flex justify-content-between">
                        <a href="{{ url_for('main.schedules') }}" class="btn btn-secondary">Cancel</a>
                        <button type="submit" class="btn btn-primary" id="submit-btn">
                            <i class="bi bi-plus-circle"></i> Create Schedule
                        </button>
                    </div>
                </div>
            </div>
        </form>
    </div>

    <!-- Help Sidebar -->
    <div class="col-lg-4">
        <div class="card sticky-top" style="top: 20px;">
            <div class="card-header">
                <h5 class="mb-0" style="color: #60a5fa;">Cron Expression Help</h5>
            </div>
            <div class="card-body">
                <h6>Field Format:</h6>
                <table class="table table-sm">
                    <thead>
                        <tr>
                            <th>Field</th>
                            <th>Values</th>
                        </tr>
                    </thead>
                    <tbody>
                        <tr>
                            <td>Minute</td>
                            <td>0-59</td>
                        </tr>
                        <tr>
                            <td>Hour</td>
                            <td>0-23</td>
                        </tr>
                        <tr>
                            <td>Day</td>
                            <td>1-31</td>
                        </tr>
                        <tr>
                            <td>Month</td>
                            <td>1-12</td>
                        </tr>
                        <tr>
                            <td>Weekday</td>
                            <td>0-6 (0=Sunday)</td>
                        </tr>
                    </tbody>
                </table>

                <h6 class="mt-3">Special Characters:</h6>
                <ul class="list-unstyled">
                    <li><code>*</code> - Any value</li>
                    <li><code>*/n</code> - Every n units</li>
                    <li><code>1,2,3</code> - Specific values</li>
                    <li><code>1-5</code> - Range of values</li>
                </ul>

                <h6 class="mt-3">Examples:</h6>
                <ul class="list-unstyled">
                    <li><code>0 0 * * *</code> - Daily at midnight</li>
                    <li><code>*/15 * * * *</code> - Every 15 minutes</li>
                    <li><code>0 9-17 * * 1-5</code> - Hourly, 9am-5pm, Mon-Fri</li>
                </ul>

                <div class="alert alert-warning mt-3">
                    <strong>Note:</strong> All times are in UTC timezone. The server is currently at
                    <strong><span id="server-time"></span></strong> UTC.
                </div>
            </div>
        </div>
    </div>
</div>

<script>
// Update server time every second
function updateServerTime() {
    const now = new Date();
    document.getElementById('server-time').textContent = now.toUTCString().split(' ')[4];
}
updateServerTime();
setInterval(updateServerTime, 1000);

// Set cron expression from template button
function setCron(expression) {
    document.getElementById('cron-expression').value = expression;
    validateCron();
}

// Validate cron expression (client-side basic validation)
function validateCron() {
    const input = document.getElementById('cron-expression');
    const expression = input.value.trim();
    const feedback = document.getElementById('cron-feedback');
    const descContainer = document.getElementById('cron-description-container');
    const description = document.getElementById('cron-description');
    const nextRunsContainer = document.getElementById('next-runs-container');

    if (!expression) {
        feedback.style.display = 'none';
        descContainer.style.display = 'none';
        nextRunsContainer.style.display = 'none';
        return;
    }

    // Basic validation: should have 5 fields
    const parts = expression.split(/\s+/);
    if (parts.length !== 5) {
        feedback.className = 'alert alert-danger';
        feedback.textContent = 'Invalid format: Cron expression must have exactly 5 fields (minute hour day month weekday)';
        feedback.style.display = 'block';
        descContainer.style.display = 'none';
        nextRunsContainer.style.display = 'none';
        return;
    }

    // Basic field validation
    const [minute, hour, day, month, weekday] = parts;

    const errors = [];

    if (!isValidCronField(minute, 0, 59)) errors.push('minute (0-59)');
    if (!isValidCronField(hour, 0, 23)) errors.push('hour (0-23)');
    if (!isValidCronField(day, 1, 31)) errors.push('day (1-31)');
    if (!isValidCronField(month, 1, 12)) errors.push('month (1-12)');
    if (!isValidCronField(weekday, 0, 6)) errors.push('weekday (0-6)');

    if (errors.length > 0) {
        feedback.className = 'alert alert-danger';
        feedback.textContent = 'Invalid fields: ' + errors.join(', ');
        feedback.style.display = 'block';
        descContainer.style.display = 'none';
        nextRunsContainer.style.display = 'none';
        return;
    }

    // Valid expression
    feedback.className = 'alert alert-success';
    feedback.textContent = 'Valid cron expression';
    feedback.style.display = 'block';

    // Show human-readable description
    description.textContent = describeCron(parts);
    descContainer.style.display = 'block';

    // Calculate and show next run times
    calculateNextRuns(expression);
    nextRunsContainer.style.display = 'block';
}

// Validate individual cron field
function isValidCronField(field, min, max) {
    if (field === '*') return true;

    // Handle ranges: 1-5
    if (field.includes('-')) {
        const [start, end] = field.split('-').map(Number);
        return start >= min && end <= max && start <= end;
    }

    // Handle steps: */5 or 1-10/2
    if (field.includes('/')) {
        const [range, step] = field.split('/');
        if (range === '*') return Number(step) > 0;
        return isValidCronField(range, min, max) && Number(step) > 0;
    }

    // Handle lists: 1,2,3
    if (field.includes(',')) {
        return field.split(',').every(v => {
            const num = Number(v);
            return !isNaN(num) && num >= min && num <= max;
        });
    }

    // Single number
    const num = Number(field);
    return !isNaN(num) && num >= min && num <= max;
}

// Generate human-readable description
function describeCron(parts) {
    const [minute, hour, day, month, weekday] = parts;

    // Common patterns
    if (minute === '0' && hour === '0' && day === '*' && month === '*' && weekday === '*') {
        return 'Runs daily at midnight (00:00 UTC)';
    }
    if (minute === '0' && hour !== '*' && day === '*' && month === '*' && weekday === '*') {
        return `Runs daily at ${hour.padStart(2, '0')}:00 UTC`;
    }
    if (minute !== '*' && hour !== '*' && day === '*' && month === '*' && weekday === '*') {
        return `Runs daily at ${hour.padStart(2, '0')}:${minute.padStart(2, '0')} UTC`;
    }
    if (minute === '0' && hour === '0' && day === '*' && month === '*' && weekday !== '*') {
        const days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
        return `Runs weekly on ${days[Number(weekday)]} at midnight`;
    }
    if (minute === '0' && hour === '0' && day !== '*' && month === '*' && weekday === '*') {
        return `Runs monthly on day ${day} at midnight`;
    }
    if (minute.startsWith('*/')) {
        const interval = minute.split('/')[1];
        return `Runs every ${interval} minutes`;
    }
    if (hour.startsWith('*/') && minute === '0') {
        const interval = hour.split('/')[1];
        return `Runs every ${interval} hours`;
    }

    return `Runs at ${minute} ${hour} ${day} ${month} ${weekday} (cron format)`;
}

// Calculate next 5 run times (simplified - server will do actual calculation)
function calculateNextRuns(expression) {
    const list = document.getElementById('next-runs-list');
    list.innerHTML = '<li class="list-group-item"><em>Will be calculated by server...</em></li>';

    // In production, this would call an API endpoint to get accurate next runs
    // For now, just show placeholder
}

// Handle form submission
document.getElementById('create-schedule-form').addEventListener('submit', async (e) => {
    e.preventDefault();

    const submitBtn = document.getElementById('submit-btn');
    const originalText = submitBtn.innerHTML;

    // Get form data
    const formData = {
        name: document.getElementById('schedule-name').value.trim(),
        config_file: document.getElementById('config-file').value,
        cron_expression: document.getElementById('cron-expression').value.trim(),
        enabled: document.getElementById('schedule-enabled').checked
    };

    // Validate
    if (!formData.name || !formData.config_file || !formData.cron_expression) {
        showNotification('Please fill in all required fields', 'warning');
        return;
    }

    // Disable submit button
    submitBtn.disabled = true;
    submitBtn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>Creating...';

    try {
        const response = await fetch('/api/schedules', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(formData)
        });

        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.error || `HTTP ${response.status}: ${response.statusText}`);
        }

        const data = await response.json();

        showNotification('Schedule created successfully! Redirecting...', 'success');

        // Redirect to schedules list
        setTimeout(() => {
            window.location.href = '/schedules';
        }, 1500);

    } catch (error) {
        console.error('Error creating schedule:', error);
        showNotification(`Error: ${error.message}`, 'danger');

        // Re-enable submit button
        submitBtn.disabled = false;
        submitBtn.innerHTML = originalText;
    }
});

// Show notification
function showNotification(message, type = 'info') {
    const notification = document.createElement('div');
    notification.className = `alert alert-${type} alert-dismissible fade show position-fixed`;
    notification.style.top = '20px';
    notification.style.right = '20px';
    notification.style.zIndex = '9999';
    notification.style.minWidth = '300px';

    notification.innerHTML = `
        ${message}
        <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
    `;

    document.body.appendChild(notification);

    setTimeout(() => {
        notification.remove();
    }, 5000);
}
</script>
{% endblock %}