{% extends 'base.html' %}
{% load static %}
{% load form_tags %}

{% block title %}Analytics - {{ form.title }}{% endblock %}

{% block extra_css %}
<style>
    .analytics-card {
        transition: all 0.3s ease;
        border: none;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .analytics-card:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }
    .stat-card {
        background: linear-gradient(135deg, var(--bs-primary) 0%, var(--bs-primary-dark, #0056b3) 100%);
        color: white;
        border-radius: 15px;
    }
    .chart-container {
        position: relative;
        height: 400px;
        margin: 20px 0;
    }
    .field-analytics-item {
        border-left: 4px solid var(--bs-primary);
        background: rgba(13, 110, 253, 0.05);
        border-radius: 0 8px 8px 0;
        padding: 1rem;
        margin-bottom: 1rem;
    }
    .progress-custom {
        height: 8px;
        border-radius: 4px;
    }
    .export-section {
        background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
        border-radius: 15px;
        padding: 2rem;
        margin-bottom: 2rem;
    }
    .card {
        height: 100%;
    }
    .card-body {
        align-content: center;
    }
</style>
{% endblock %}

{% block content %}
<div class="d-flex justify-content-between align-items-center mb-4">
    <div>
        <h1><i class="fas fa-chart-line me-2"></i>Form Analytics</h1>
        <p class="text-muted mb-0">{{ form.title }}</p>
    </div>
    <div>
        <a href="{% url 'form_responses' form.pk %}" class="btn btn-info me-2">
            <i class="fas fa-list me-1"></i>View Responses
        </a>
        <a href="{% url 'form_builder' form.pk %}" class="btn btn-outline-primary">
            <i class="fas fa-edit me-1"></i>Edit Form
        </a>
    </div>
</div>

<!-- Export Section -->
<div class="export-section">
    <div class="row align-items-center">
        <div class="col-md-8">
            <h4 class="mb-1"><i class="fas fa-download me-2"></i>Export Analytics Report</h4>
            <p class="text-muted mb-0">Generate comprehensive analytics reports in various formats</p>
        </div>
        <div class="col-md-4 text-end">
            <div class="btn-group" role="group">
                <button type="button" class="btn btn-outline-success" onclick="exportReport('csv')">
                    <i class="fas fa-file-csv me-1"></i>CSV
                </button>
                <button type="button" class="btn btn-outline-primary" onclick="exportReport('excel')">
                    <i class="fas fa-file-excel me-1"></i>Excel
                </button>
                <button type="button" class="btn btn-outline-danger" onclick="exportReport('pdf')">
                    <i class="fas fa-file-pdf me-1"></i>PDF
                </button>
            </div>
        </div>
    </div>
</div>

<!-- Key Metrics -->
<div class="row mb-4">
    <div class="col-lg-3 col-md-6 mb-3">
        <div class="card stat-card text-white">
            <div class="card-body text-center">
                <i class="fas fa-reply fa-3x mb-3 opacity-75"></i>
                <h2 class="mb-1">{{ total_responses|default:0 }}</h2>
                <p class="mb-0">Total Responses</p>
            </div>
        </div>
    </div>
    <div class="col-lg-3 col-md-6 mb-3">
        <div class="card stat-card text-white" style="background: linear-gradient(135deg, #198754 0%, #146c43 100%);">
            <div class="card-body text-center">
                <i class="fas fa-eye fa-3x mb-3 opacity-75"></i>
                <h2 class="mb-1">{{ total_views|default:0 }}</h2>
                <p class="mb-0">Total Views</p>
            </div>
        </div>
    </div>
    <div class="col-lg-3 col-md-6 mb-3">
        <div class="card stat-card text-white" style="background: linear-gradient(135deg, #fd7e14 0%, #e55a00 100%);">
            <div class="card-body text-center">
                <i class="fas fa-percentage fa-3x mb-3 opacity-75"></i>
                <h2 class="mb-1">{{ completion_rate|default:0|floatformat:1 }}%</h2>
                <p class="mb-0">Completion Rate</p>
            </div>
        </div>
    </div>
    <div class="col-lg-3 col-md-6 mb-3">
        <div class="card stat-card text-white" style="background: linear-gradient(135deg, #6f42c1 0%, #5a2d91 100%);">
            <div class="card-body text-center">
                <i class="fas fa-clock fa-3x mb-3 opacity-75"></i>
                <h2 class="mb-1">{{ avg_response_time|default:"N/A" }}</h2>
                <p class="mb-0">Avg. Response Time</p>
            </div>
        </div>
    </div>
</div>

{% if total_responses > 0 %}
    <!-- Charts Section -->
    <div class="row mb-4">
        <div class="col-lg-8">
            <div class="card analytics-card">
                <div class="card-header">
                    <h5 class="mb-0"><i class="fas fa-chart-area me-2"></i>Responses Over Time</h5>
                </div>
                <div class="card-body">
                    <div class="chart-container">
                        <canvas id="responsesChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
        <div class="col-lg-4">
            <div class="card analytics-card">
                <div class="card-header">
                    <h5 class="mb-0"><i class="fas fa-chart-pie me-2"></i>Response Sources</h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="height: 300px;">
                        <canvas id="sourcesChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Field Analytics -->
    <div class="card analytics-card mb-4">
        <div class="card-header">
            <h5 class="mb-0"><i class="fas fa-chart-bar me-2"></i>Field Analytics</h5>
        </div>
        <div class="card-body">
            {% for field_stat in field_analytics %}
                <div class="field-analytics-item">
                    <div class="row align-items-center">
                        <div class="col-md-4">
                            <h6 class="mb-1">
                                <i class="{{ field_stat.field.field_type|get_field_type_icon }} me-2"></i>
                                {{ field_stat.field.label }}
                            </h6>
                            <small class="text-muted">{{ field_stat.field.get_field_type_display }}</small>
                        </div>
                        <div class="col-md-4">
                            <div class="mb-2">
                                <small class="text-muted">Response Rate</small>
                                <div class="progress progress-custom">
                                    <div class="progress-bar" role="progressbar" 
                                         style="width: {{ field_stat.response_rate }}%"
                                         aria-valuenow="{{ field_stat.response_rate }}" 
                                         aria-valuemin="0" aria-valuemax="100">
                                    </div>
                                </div>
                                <small class="text-muted">{{ field_stat.response_rate|floatformat:1 }}%</small>
                            </div>
                        </div>
                        <div class="col-md-4">
                            <div class="text-end">
                                <div class="h5 mb-0">{{ field_stat.total_responses }}</div>
                                <small class="text-muted">responses</small>
                            </div>
                        </div>
                    </div>
                    
                    {% if field_stat.choice_distribution %}
                        <div class="mt-3">
                            <h6 class="mb-2">Choice Distribution:</h6>
                            {% for choice, count in field_stat.choice_distribution.items %}
                                <div class="d-flex justify-content-between align-items-center mb-1">
                                    <span class="small">{{ choice }}</span>
                                    <div class="d-flex align-items-center">
                                        <div class="progress me-2" style="width: 100px; height: 6px;">
                                            <div class="progress-bar bg-info" 
                                                 style="width: {{ count|percentage:field_stat.total_responses }}%"></div>
                                        </div>
                                        <span class="small text-muted">{{ count }}</span>
                                    </div>
                                </div>
                            {% endfor %}
                        </div>
                    {% endif %}
                    
                    {% if field_stat.avg_value %}
                        <div class="mt-3">
                            <div class="row text-center">
                                <div class="col-4">
                                    <div class="small text-muted">Average</div>
                                    <div class="fw-bold">{{ field_stat.avg_value|floatformat:2 }}</div>
                                </div>
                                <div class="col-4">
                                    <div class="small text-muted">Minimum</div>
                                    <div class="fw-bold">{{ field_stat.min_value }}</div>
                                </div>
                                <div class="col-4">
                                    <div class="small text-muted">Maximum</div>
                                    <div class="fw-bold">{{ field_stat.max_value }}</div>
                                </div>
                            </div>
                        </div>
                    {% endif %}
                </div>
            {% empty %}
                <div class="text-center py-3">
                    <i class="fas fa-chart-bar fa-3x text-muted mb-3"></i>
                    <p class="text-muted">No field analytics available yet.</p>
                </div>
            {% endfor %}
        </div>
    </div>

    <!-- Detailed Statistics -->
    <div class="row">
        <div class="col-lg-6">
            <div class="card analytics-card">
                <div class="card-header">
                    <h5 class="mb-0"><i class="fas fa-calendar-alt me-2"></i>Response Timeline</h5>
                </div>
                <div class="card-body">
                    <div class="table-responsive">
                        <table class="table table-sm">
                            <thead>
                                <tr>
                                    <th>Period</th>
                                    <th>Responses</th>
                                    <th>Growth</th>
                                </tr>
                            </thead>
                            <tbody>
                                <tr>
                                    <td>Today</td>
                                    <td><span class="badge bg-primary">{{ responses_today }}</span></td>
                                    <td>
                                        <span class="{% if growth_today >= 0 %}text-success{% else %}text-danger{% endif %}">
                                            <i class="fas {% if growth_today >= 0 %}fa-arrow-up{% else %}fa-arrow-down{% endif %}"></i>
                                            {{ growth_today }}%
                                        </span>
                                    </td>
                                </tr>
                                <tr>
                                    <td>This Week</td>
                                    <td><span class="badge bg-info">{{ responses_week }}</span></td>
                                    <td>
                                        <span class="{% if growth_week >= 0 %}text-success{% else %}text-danger{% endif %}">
                                            <i class="fas {% if growth_week >= 0 %}fa-arrow-up{% else %}fa-arrow-down{% endif %}"></i>
                                            {{ growth_week }}%
                                        </span>
                                    </td>
                                </tr>
                                <tr>
                                    <td>This Month</td>
                                    <td><span class="badge bg-success">{{ responses_month }}</span></td>
                                    <td>
                                        <span class="{% if growth_month >= 0 %}text-success{% else %}text-danger{% endif %}">
                                            <i class="fas {% if growth_month >= 0 %}fa-arrow-up{% else %}fa-arrow-down{% endif %}"></i>
                                            {{ growth_month }}%
                                        </span>
                                    </td>
                                </tr>
                            </tbody>
                        </table>
                    </div>
                </div>
            </div>
        </div>

        
        <div class="col-lg-6">
            <div class="card analytics-card">
                <div class="card-header">
                    <h5 class="mb-0"><i class="fas fa-users me-2"></i>User Insights</h5>
                </div>
                <div class="card-body">
                    <div class="row text-center">
                        <div class="col-6 mb-3">
                            <div class="border-end">
                                <div class="h4 text-primary mb-1">{{ registered_users_count }}</div>
                                <small class="text-muted">Registered Users</small>
                            </div>
                        </div>
                        <div class="col-6 mb-3">
                            <div class="h4 text-warning mb-1">{{ anonymous_users_count }}</div>
                            <small class="text-muted">Anonymous Users</small>
                        </div>
                        <div class="col-12">
                            <div class="progress progress-custom">
                                <div class="progress-bar bg-primary" style="width: {{ registered_users_count|percentage:total_responses }}%"></div>
                                <div class="progress-bar bg-warning" style="width: {{ anonymous_users_count|percentage:total_responses }}%"></div>
                            </div>
                            <small class="text-muted mt-1 d-block">User Type Distribution</small>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

{% else %}
    <!-- No Data State -->
    <div class="card analytics-card">
        <div class="card-body text-center py-5">
            <i class="fas fa-chart-line fa-4x text-muted mb-4"></i>
            <h3>No Analytics Data Yet</h3>
            <p class="text-muted mb-4">Start collecting responses to see detailed analytics and insights.</p>
            <div class="row justify-content-center">
                <div class="col-md-6">
                    <div class="input-group">
                        <input type="text" class="form-control" id="share-url" 
                               value="{{ request.build_absolute_uri }}" readonly>
                        <button class="btn btn-primary" type="button" onclick="copyFormUrl()">
                            <i class="fas fa-copy"></i>
                        </button>
                    </div>
                    <small class="text-muted">Share this URL to start collecting responses</small>
                </div>
            </div>
        </div>
    </div>
{% endif %}
{% endblock %}

{% block extra_js %}
<!-- Chart.js (local UMD build) -->
<script src="{% static 'vendor/chartjs/chart.umd.min.js' %}"></script>
<script>
$(document).ready(function() {
    {% if total_responses > 0 %}
        // Responses Over Time Chart
        const responsesData = {{ responses_by_day|safe }};
        const responsesCtx = document.getElementById('responsesChart').getContext('2d');
        
        const dates = Object.keys(responsesData).sort();
        const values = dates.map(date => responsesData[date] || 0);
        
        new Chart(responsesCtx, {
            type: 'line',
            data: {
                labels: dates.map(date => new Date(date).toLocaleDateString()),
                datasets: [{
                    label: 'Responses',
                    data: values,
                    borderColor: '#0d6efd',
                    backgroundColor: 'rgba(13, 110, 253, 0.1)',
                    borderWidth: 3,
                    fill: true,
                    tension: 0.4
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        display: false
                    }
                },
                scales: {
                    y: {
                        beginAtZero: true,
                        ticks: {
                            stepSize: 1
                        }
                    }
                }
            }
        });
        
        // Response Sources Chart
        const sourcesCtx = document.getElementById('sourcesChart').getContext('2d');
        new Chart(sourcesCtx, {
            type: 'doughnut',
            data: {
                labels: ['Direct', 'Referral', 'Social', 'Email'],
                datasets: [{
                    data: [45, 25, 20, 10],
                    backgroundColor: [
                        '#0d6efd',
                        '#198754',
                        '#fd7e14',
                        '#6f42c1'
                    ],
                    borderWidth: 0
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        position: 'bottom'
                    }
                }
            }
        });
    {% endif %}
});

function exportReport(format) {
    const exportUrl = `{% url 'export_analytics' form.pk 'FORMAT' %}`.replace('FORMAT', format);
    
    window.showToast(`Generating ${format.toUpperCase()} analytics report...`, 'info');
    
    // Create a temporary link and click it to download
    const link = document.createElement('a');
    link.href = exportUrl;
    link.download = '';
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    
    setTimeout(() => {
        window.showToast(`${format.toUpperCase()} report generated successfully!`, 'success');
    }, 1000);
}

function copyFormUrl() {
    var formUrl = "{{ request.scheme }}://{{ request.get_host }}{% url 'form_detail' form.pk %}";
    window.copyToClipboard(formUrl);
}
</script>
{% endblock %}