{% extends "base.html" %}
{% from "components/ui.html" import page_header, breadcrumb_nav, button, filter_badge %}

{% block title %}{{ _('Analytics Dashboard') }} - {{ app_name }}{% endblock %}

{% block content %}
{% set breadcrumbs = [
    {'text': _('Analytics')}
] %}

{% set analytics_actions %}
<div class="flex items-center gap-2">
    <select id="timeRange" class="bg-background-light dark:bg-gray-700 border border-transparent dark:border-transparent rounded-lg py-2 px-3 text-sm text-text-light dark:text-text-dark">
        <option value="7">{{ _('Last 7 days') }}</option>
        <option value="30" selected>{{ _('Last 30 days') }}</option>
        <option value="90">{{ _('Last 90 days') }}</option>
        <option value="365">{{ _('Last year') }}</option>
    </select>
    <button id="refreshCharts" class="bg-primary text-white px-4 py-2 rounded-lg hover:bg-primary/90 transition-colors">
        <i class="fas fa-sync-alt mr-2"></i> {{ _('Refresh') }}
    </button>
</div>
{% endset %}

{{ page_header(
    icon_class='fas fa-chart-line',
    title_text=_('Analytics Dashboard'),
    subtitle_text=_('Key metrics and insights about your time tracking'),
    breadcrumbs=breadcrumbs,
    actions_html=analytics_actions
) }}

<div class="container-fluid">

    <!-- Summary Cards -->
    <div class="row mb-4">
        <div class="col-md-3 mb-3">
            <div class="card text-center h-100">
                <div class="card-body">
                    <i class="fas fa-clock fa-2x text-primary mb-2"></i>
                    <h4 class="text-primary" id="totalHours">-</h4>
                    <p class="text-muted mb-0">{{ _('Total Hours') }}</p>
                </div>
            </div>
        </div>
        <div class="col-md-3 mb-3">
            <div class="card text-center h-100">
                <div class="card-body">
                    <i class="fas fa-dollar-sign fa-2x text-success mb-2"></i>
                    <h4 class="text-success" id="billableHours">-</h4>
                    <p class="text-muted mb-0">{{ _('Billable Hours') }}</p>
                </div>
            </div>
        </div>
        <div class="col-md-3 mb-3">
            <div class="card text-center h-100">
                <div class="card-body">
                    <i class="fas fa-project-diagram fa-2x text-info mb-2"></i>
                    <h4 class="text-info" id="activeProjects">-</h4>
                    <p class="text-muted mb-0">{{ _('Active Projects') }}</p>
                </div>
            </div>
        </div>
        <div class="col-md-3 mb-3">
            <div class="card text-center h-100">
                <div class="card-body">
                    <i class="fas fa-chart-line fa-2x text-warning mb-2"></i>
                    <h4 class="text-warning" id="avgDailyHours">-</h4>
                    <p class="text-muted mb-0">{{ _('Avg Daily Hours') }}</p>
                </div>
            </div>
        </div>
    </div>

    <!-- Charts Row 1 -->
    <div class="row mb-4">
        <div class="col-lg-8 mb-4">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-chart-area"></i> {{ _('Daily Hours Trend') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px; width: 100%;">
                        <canvas id="dailyHoursChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
        <div class="col-lg-4 mb-4">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-chart-pie"></i> {{ _('Billable vs Non-Billable') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px; width: 100%;">
                        <canvas id="billableChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Charts Row 2 -->
    <div class="row mb-4">
        <div class="col-lg-6 mb-4">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-chart-bar"></i> {{ _('Hours by Project') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px; width: 100%;">
                        <canvas id="projectChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
        <div class="col-lg-6 mb-4">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-chart-line"></i> {{ _('Weekly Trends') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px; width: 100%;">
                        <canvas id="weeklyTrendsChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Charts Row 3 -->
    <div class="row mb-4">
        <div class="col-lg-6 mb-4">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-clock"></i> {{ _('Hours by Time of Day') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px; width: 100%;">
                        <canvas id="hourlyChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
        <div class="col-lg-6 mb-4">
            <div class="card h-100">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-chart-bar"></i> {{ _('Project Efficiency') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px; width: 100%;">
                        <canvas id="efficiencyChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- User Performance Chart (Admin Only) -->
    {% if current_user.is_admin %}
    <div class="row mb-4">
        <div class="col-12">
            <div class="card">
                <div class="card-header">
                    <h5 class="mb-0">
                        <i class="fas fa-users"></i> {{ _('User Performance') }}
                    </h5>
                </div>
                <div class="card-body">
                    <div class="chart-container" style="position: relative; height: 300px;">
                        <canvas id="userChart"></canvas>
                    </div>
                </div>
            </div>
        </div>
    </div>
    {% endif %}
</div>

<!-- Loading Spinner -->
<div id="loadingSpinner" class="position-fixed top-50 start-50 translate-middle" style="display: none; z-index: 9999;">
    <div class="spinner-border text-primary" role="status">
        <span class="visually-hidden">{{ _('Loading...') }}</span>
    </div>
</div>
{% endblock %}

{% block extra_head %}
<!-- Chart.js library -->
<script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js"></script>

<script type="application/json" id="i18n-json-analytics-dashboard">
    {
        "error_loading_charts": {{ _('Failed to load charts. Please try again.')|tojson }},
        "error_refreshing_charts": {{ _('Failed to refresh charts. Please try again.')|tojson }},
        "hours_label": {{ _('Hours')|tojson }},
        "date_label": {{ _('Date')|tojson }},
        "hour_of_day_label": {{ _('Hour of Day')|tojson }},
        "revenue_label": {{ _('Revenue')|tojson }}
    }
  </script>
  <script>
    // Ensure i18n_analytics is always defined globally
    window.i18n_analytics = (function(){
        try {
            var el = document.getElementById('i18n-json-analytics-dashboard');
            return el ? JSON.parse(el.textContent) : {
                "error_loading_charts": "Failed to load charts. Please try again.",
                "error_refreshing_charts": "Failed to refresh charts. Please try again.",
                "hours_label": "Hours",
                "date_label": "Date",
                "hour_of_day_label": "Hour of Day",
                "revenue_label": "Revenue"
            };
        } catch (e) { 
            return {
                "error_loading_charts": "Failed to load charts. Please try again.",
                "error_refreshing_charts": "Failed to refresh charts. Please try again.",
                "hours_label": "Hours",
                "date_label": "Date",
                "hour_of_day_label": "Hour of Day",
                "revenue_label": "Revenue"
            };
        }
    })();
    
    // Also make it available as a local variable for backward compatibility
    var i18n_analytics = window.i18n_analytics;
  </script>
{% endblock %}

{% block extra_js %}
<script>
// Global chart instances
let charts = {};

// Chart.js global defaults
Chart.defaults.font.family = "'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif";
Chart.defaults.font.size = 12;
Chart.defaults.color = '#64748b';
Chart.defaults.plugins.legend.position = 'bottom';
Chart.defaults.plugins.legend.labels.usePointStyle = true;
Chart.defaults.plugins.legend.labels.padding = 20;

// Analytics Dashboard Controller
class AnalyticsDashboard {
    constructor() {
        this.timeRange = 30;
        this.charts = {};
        this.init();
    }

    init() {
        this.bindEvents();
        this.loadCharts();
        this.updateSummaryCards();
    }

    bindEvents() {
        document.getElementById('timeRange').addEventListener('change', (e) => {
            this.timeRange = parseInt(e.target.value);
            this.refreshAllCharts();
        });

        document.getElementById('refreshCharts').addEventListener('click', () => {
            this.refreshAllCharts();
        });
    }

    showLoading() {
        document.getElementById('loadingSpinner').style.display = 'block';
    }

    hideLoading() {
        document.getElementById('loadingSpinner').style.display = 'none';
    }

    async loadCharts() {
        this.showLoading();
        
        try {
            await Promise.all([
                this.loadDailyHoursChart(),
                this.loadBillableChart(),
                this.loadProjectChart(),
                this.loadWeeklyTrendsChart(),
                this.loadHourlyChart(),
                this.loadEfficiencyChart(),
                {% if current_user.is_admin %}
                this.loadUserChart(),
                {% endif %}
            ]);
        } catch (error) {
            console.error('Error loading charts:', error);
            this.showError(i18n_analytics.error_loading_charts || 'Failed to load charts. Please try again.');
        } finally {
            this.hideLoading();
        }
    }

    async refreshAllCharts() {
        this.showLoading();
        
        try {
            await Promise.all([
                this.loadDailyHoursChart(true),
                this.loadBillableChart(true),
                this.loadProjectChart(true),
                this.loadWeeklyTrendsChart(true),
                this.loadHourlyChart(true),
                this.loadEfficiencyChart(true),
                {% if current_user.is_admin %}
                this.loadUserChart(true),
                {% endif %}
            ]);
            this.updateSummaryCards();
        } catch (error) {
            console.error('Error refreshing charts:', error);
            this.showError(i18n_analytics.error_refreshing_charts || 'Failed to refresh charts. Please try again.');
        } finally {
            this.hideLoading();
        }
    }

    async loadDailyHoursChart(refresh = false) {
        const response = await fetch(`/api/analytics/hours-by-day?days=${this.timeRange}`);
        const data = await response.json();
        
        if (refresh && this.charts.dailyHours) {
            this.charts.dailyHours.destroy();
        }
        
        const ctx = document.getElementById('dailyHoursChart').getContext('2d');
        this.charts.dailyHours = new Chart(ctx, {
            type: 'line',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        display: false
                    }
                },
                scales: {
                    y: {
                        beginAtZero: true,
                        title: {
                            display: true,
                            text: (i18n_analytics.hours_label || 'Hours')
                        }
                    },
                    x: {
                        title: {
                            display: true,
                            text: (i18n_analytics.date_label || 'Date')
                        }
                    }
                },
                interaction: {
                    intersect: false,
                    mode: 'index'
                }
            }
        });
    }

    async loadBillableChart(refresh = false) {
        const response = await fetch(`/api/analytics/billable-vs-nonbillable?days=${this.timeRange}`);
        const data = await response.json();
        
        if (refresh && this.charts.billable) {
            this.charts.billable.destroy();
        }
        
        const ctx = document.getElementById('billableChart').getContext('2d');
        this.charts.billable = new Chart(ctx, {
            type: 'doughnut',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        position: 'bottom'
                    }
                }
            }
        });
    }

    async loadProjectChart(refresh = false) {
        const response = await fetch(`/api/analytics/hours-by-project?days=${this.timeRange}`);
        const data = await response.json();
        
        if (refresh && this.charts.project) {
            this.charts.project.destroy();
        }
        
        const ctx = document.getElementById('projectChart').getContext('2d');
        this.charts.project = new Chart(ctx, {
            type: 'bar',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        display: false
                    }
                },
                scales: {
                    y: {
                        beginAtZero: true,
                        title: {
                            display: true,
                            text: (i18n_analytics.hours_label || 'Hours')
                        }
                    }
                }
            }
        });
    }

    async loadWeeklyTrendsChart(refresh = false) {
        const response = await fetch(`/api/analytics/weekly-trends?weeks=${Math.min(12, Math.ceil(this.timeRange / 7))}`);
        const data = await response.json();
        
        if (refresh && this.charts.weeklyTrends) {
            this.charts.weeklyTrends.destroy();
        }
        
        const ctx = document.getElementById('weeklyTrendsChart').getContext('2d');
        this.charts.weeklyTrends = new Chart(ctx, {
            type: 'line',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        display: false
                    }
                },
                scales: {
                    y: {
                        beginAtZero: true,
                        title: {
                            display: true,
                            text: (i18n_analytics.hours_label || 'Hours')
                        }
                    }
                }
            }
        });
    }

    async loadHourlyChart(refresh = false) {
        const response = await fetch(`/api/analytics/hours-by-hour?days=${this.timeRange}`);
        const data = await response.json();
        
        if (refresh && this.charts.hourly) {
            this.charts.hourly.destroy();
        }
        
        const ctx = document.getElementById('hourlyChart').getContext('2d');
        this.charts.hourly = new Chart(ctx, {
            type: 'line',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        display: false
                    }
                },
                scales: {
                    y: {
                        beginAtZero: true,
                        title: {
                            display: true,
                            text: (i18n_analytics.hours_label || 'Hours')
                        }
                    },
                    x: {
                        title: {
                            display: true,
                            text: (i18n_analytics.hour_of_day_label || 'Hour of Day')
                        }
                    }
                }
            }
        });
    }

    async loadEfficiencyChart(refresh = false) {
        const response = await fetch(`/api/analytics/project-efficiency?days=${this.timeRange}`);
        const data = await response.json();
        
        if (refresh && this.charts.efficiency) {
            this.charts.efficiency.destroy();
        }
        
        const ctx = document.getElementById('efficiencyChart').getContext('2d');
        this.charts.efficiency = new Chart(ctx, {
            type: 'bar',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        position: 'bottom'
                    }
                },
                scales: {
                    y: {
                        type: 'linear',
                        display: true,
                        position: 'left',
                        title: {
                            display: true,
                            text: (i18n_analytics.hours_label || 'Hours')
                        }
                    },
                    y1: {
                        type: 'linear',
                        display: true,
                        position: 'right',
                        title: {
                            display: true,
                            text: (i18n_analytics.revenue_label || 'Revenue')
                        },
                        grid: {
                            drawOnChartArea: false,
                        },
                    }
                }
            }
        });
    }

    {% if current_user.is_admin %}
    async loadUserChart(refresh = false) {
        const response = await fetch(`/api/analytics/hours-by-user?days=${this.timeRange}`);
        const data = await response.json();
        
        if (refresh && this.charts.user) {
            this.charts.user.destroy();
        }
        
        const ctx = document.getElementById('userChart').getContext('2d');
        this.charts.user = new Chart(ctx, {
            type: 'bar',
            data: data,
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: {
                    legend: {
                        display: false
                    }
                },
                scales: {
                    y: {
                        beginAtZero: true,
                        title: {
                            display: true,
                            text: (i18n_analytics.hours_label || 'Hours')
                        }
                    }
                }
            }
        });
    }
    {% endif %}

    async updateSummaryCards() {
        try {
            // Get summary data from daily hours chart
            const response = await fetch(`/api/analytics/hours-by-day?days=${this.timeRange}`);
            const data = await response.json();
            
            const totalHours = data.datasets[0].data.reduce((sum, hours) => sum + hours, 0);
            const avgDailyHours = totalHours / data.datasets[0].data.length;
            
            document.getElementById('totalHours').textContent = totalHours.toFixed(1) + 'h';
            document.getElementById('avgDailyHours').textContent = avgDailyHours.toFixed(1) + 'h';
            
            // Get billable data
            const billableResponse = await fetch(`/api/analytics/billable-vs-nonbillable?days=${this.timeRange}`);
            const billableData = await billableResponse.json();
            const billableHours = billableData.datasets[0].data[0];
            document.getElementById('billableHours').textContent = billableHours.toFixed(1) + 'h';
            
            // Get project count
            const projectResponse = await fetch(`/api/analytics/hours-by-project?days=${this.timeRange}`);
            const projectData = await projectResponse.json();
            document.getElementById('activeProjects').textContent = projectData.labels.length;
            
        } catch (error) {
            console.error('Error updating summary cards:', error);
        }
    }

    showError(message) {
        // Use the new toast notification system
        if (window.toastManager) {
            window.toastManager.error(message, 'Error', 5000);
        } else {
            // Fallback to console if toast system not available
            console.error('Analytics error:', message);
        }
    }
}

// Initialize dashboard when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    new AnalyticsDashboard();
});
</script>
{% endblock %}