{% extends "base.html" %}

{% block title %}Daily Calories Chart{% endblock %}

{% block content %}
<div class="container mt-4 d-flex flex-column min-vh-100">
    <h2><i class="bi bi-graph-up"></i> Daily Calories Chart</h2>
    
    <div class="row mb-4">
        <div class="col-md-6">
            <div class="card">
                <div class="card-body">
                    <div class="d-flex align-items-center flex-wrap gap-2">
                        <label for="daysSelect" class="form-label mb-0 me-2">Select Time Period:</label>
                        <select class="form-select w-auto" id="daysSelect">
                            <option value="7">Past 7 Days</option>
                            <option value="30">Past 30 Days</option>
                        </select>
                        <button class="btn btn-primary" id="loadChartBtn">Load Chart</button>
                    </div>
                </div>
            </div>
        </div>
    </div>
    
    <div class="row flex-grow-1">
        <div class="col-md-12 h-100">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">Calories Consumed</h5>
                </div>
                <div class="card-body p-2 h-100">
                    <div class="position-relative h-100">
                        <canvas id="caloriesChart" class="w-100 h-100"></canvas>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script>
    let chart;

    document.addEventListener('DOMContentLoaded', function() {
        const daysSelect = document.getElementById('daysSelect');
        const loadBtn = document.getElementById('loadChartBtn');
        const ctx = document.getElementById('caloriesChart').getContext('2d');

        // Default load for 7 days
        loadChart(7);

        loadBtn.addEventListener('click', function() {
            const selectedDays = parseInt(daysSelect.value);
            loadChart(selectedDays);
        });

        function loadChart(days) {
            fetch(`/api/charts?person=Sarah&days=${days}`)
                .then(response => response.json())
                .then(data => {
                    // Sort data by date ascending for chart
                    data.sort((a, b) => new Date(a.date) - new Date(b.date));

                    const labels = data.map(item => item.date);
                    const calories = data.map(item => item.calories);

                    if (chart) {
                        chart.destroy();
                    }

                    chart = new Chart(ctx, {
                        type: 'line',
                        data: {
                            labels: labels,
                            datasets: [{
                                label: 'Calories',
                                data: calories,
                                borderColor: 'rgb(75, 192, 192)',
                                backgroundColor: 'rgba(75, 192, 192, 0.2)',
                                tension: 0.1,
                                fill: true
                            }]
                        },
                        options: {
                            responsive: true,
                            maintainAspectRatio: false,
                            scales: {
                                y: {
                                    beginAtZero: true,
                                    title: {
                                        display: true,
                                        text: 'Calories'
                                    }
                                },
                                x: {
                                    title: {
                                        display: true,
                                        text: 'Date'
                                    }
                                }
                            }
                        }
                    });
                })
                .catch(error => {
                    console.error('Error loading chart data:', error);
                    alert('Failed to load chart data');
                });
        }
    });
</script>
{% endblock %}