notifications-admin/app/assets/javascripts/activityChart.js

(function (window) {

    if (document.getElementById('activityChartContainer')) {

        const COLORS = {
            delivered: '#0076d6',
            failed: '#c6cace',
            text: '#666'
        };

        const FONT_SIZE = 16;
        const FONT_WEIGHT = 'bold';
        const MAX_Y = 120;

        const createChart = function(containerId, labels, deliveredData, failedData) {
            const container = d3.select(containerId);
            container.selectAll('*').remove(); // Clear any existing content

            const margin = { top: 60, right: 20, bottom: 40, left: 20 }; // Adjusted top margin for legend
            const width = container.node().getBoundingClientRect().width - margin.left - margin.right;
            const height = 400 - margin.top - margin.bottom;

            const svg = container.append('svg')
                .attr('width', width + margin.left + margin.right)
                .attr('height', height + margin.top + margin.bottom)
                .append('g')
                .attr('transform', `translate(${margin.left},${margin.top})`);

            // Create legend
            const legendContainer = d3.select('.chart-legend');
            legendContainer.selectAll('*').remove(); // Clear any existing legend

            const legendData = [
                { label: 'Delivered', color: COLORS.delivered },
                { label: 'Failed', color: COLORS.failed }
            ];

            const legendItem = legendContainer.selectAll('.legend-item')
                .data(legendData)
                .enter()
                .append('div')
                .attr('class', 'legend-item');

            legendItem.append('div')
                .attr('class', 'legend-rect')
                .style('background-color', d => d.color)
                .style('display', 'inline-block')
                .style('margin-right', '5px');

            legendItem.append('span')
                .attr('class', 'legend-label')
                .text(d => d.label);

            const x = d3.scaleBand()
                .domain(labels)
                .range([0, width])
                .padding(0.1);
                            // Adjust the y-axis domain to add some space above the tallest bar
            const maxY = d3.max(deliveredData.map((d, i) => d + (failedData[i] || 0)));
            const y = d3.scaleLinear()
                .domain([0, maxY + 2]) // Add 2 units of space at the top
                .nice()
                .range([height, 0]);

            svg.append('g')
                .attr('class', 'x axis')
                .attr('transform', `translate(0,${height})`)
                .call(d3.axisBottom(x));

            // Generate the y-axis with whole numbers
            const yAxis = d3.axisLeft(y)
                .ticks(Math.min(maxY + 2, 10)) // Generate up to 10 ticks based on the data
                .tickFormat(d3.format('d')); // Ensure whole numbers on the y-axis

            svg.append('g')
                .attr('class', 'y axis')
                .call(yAxis);

            // Data for stacking
            const stackData = labels.map((label, i) => ({
                label: label,
                delivered: deliveredData[i],
                failed: failedData[i] || 0 // Ensure there's a value for failed, even if it's 0
            }));

            // Stack the data
            const stack = d3.stack()
                .keys(['delivered', 'failed'])
                .order(d3.stackOrderNone)
                .offset(d3.stackOffsetNone);

            const series = stack(stackData);

            // Color scale
            const color = d3.scaleOrdinal()
                .domain(['delivered', 'failed'])
                .range([COLORS.delivered, COLORS.failed]);
                            // Create tooltip
            const tooltip = d3.select('body').append('div')
            .attr('id', 'tooltip')
            .style('display', 'none');

        // Create bars with animation
        const barGroups = svg.selectAll('.bar-group')
            .data(series)
            .enter()
            .append('g')
            .attr('class', 'bar-group')
            .attr('fill', d => color(d.key));

        barGroups.selectAll('rect')
            .data(d => d)
            .enter()
            .append('rect')
            .attr('x', d => x(d.data.label))
            .attr('y', height)
            .attr('height', 0)
            .attr('width', x.bandwidth())
            .on('mouseover', function(event, d) {
                const key = d3.select(this.parentNode).datum().key;
                const capitalizedKey = key.charAt(0).toUpperCase() + key.slice(1);
                tooltip.style('display', 'block')
                    .html(`${d.data.label}<br>${capitalizedKey}: ${d.data[key]}`);
            })
            .on('mousemove', function(event) {
                tooltip.style('left', `${event.pageX + 10}px`)
                    .style('top', `${event.pageY - 20}px`);
            })
            .on('mouseout', function() {
                tooltip.style('display', 'none');
            })
            .transition()
            .duration(1000)
            .attr('y', d => y(d[1]))
            .attr('height', d => y(d[0]) - y(d[1]));
    };

    // Function to create an accessible table
    const createTable = function(tableId, chartType, labels, deliveredData, failedData) {
        const table = document.getElementById(tableId);
        table.innerHTML = ""; // Clear previous data

        const captionText = document.querySelector(`#${chartType} .chart-subtitle`).textContent;
        const caption = document.createElement('caption');
        caption.textContent = captionText;
        const thead = document.createElement('thead');
        const tbody = document.createElement('tbody');

        // Create table header
        const headerRow = document.createElement('tr');
        const headers = ['Day', 'Delivered', 'Failed'];
        headers.forEach(headerText => {
            const th = document.createElement('th');
            th.textContent = headerText;
            headerRow.appendChild(th);
        });
        thead.appendChild(headerRow);

        // Create table body
        labels.forEach((label, index) => {
            const row = document.createElement('tr');
            const cellDay = document.createElement('td');
            cellDay.textContent = label;
            row.appendChild(cellDay);

            const cellDelivered = document.createElement('td');
            cellDelivered.textContent = deliveredData[index];
            row.appendChild(cellDelivered);

            const cellFailed = document.createElement('td');
            cellFailed.textContent = failedData[index];
            row.appendChild(cellFailed);

            tbody.appendChild(row);
        });

        table.appendChild(caption);
        table.appendChild(thead);
        table.append(tbody);
    };

    const fetchData = function(type) {
        var ctx = document.getElementById('weeklyChart');
        if (!ctx) {
            return;
        }

        var socket = io("/services");
        var eventType = type === 'service' ? 'fetch_daily_stats' : 'fetch_daily_stats_by_user';
        var socketConnect = type === 'service' ? 'daily_stats_update' : 'daily_stats_by_user_update';

        socket.on('connect', function () {
            socket.emit(eventType);
        });

        socket.on('connect_error', function(error) {
            console.error('WebSocket connection error:', error);
        });

        socket.on(socketConnect, function(data) {

            var labels = [];
            var deliveredData = [];
            var failedData = [];

            for (var dateString in data) {
                // Parse the date string (assuming format YYYY-MM-DD)
                const dateParts = dateString.split('-');
                const formattedDate = `${dateParts[1]}/${dateParts[2]}/${dateParts[0].slice(2)}`; // Format to MM/DD/YY

                labels.push(formattedDate);
                deliveredData.push(data[dateString].sms.delivered);
                failedData.push(data[dateString].sms.failure);
            }

            createChart('#weeklyChart', labels, deliveredData, failedData);
            createTable('weeklyTable', 'activityChart', labels, deliveredData, failedData);
        });

        socket.on('error', function(data) {
            console.log('Error:', data);
        });
    };

    const handleDropdownChange = function(event) {
        const selectedValue = event.target.value;
        const subTitle = document.querySelector(`#activityChartContainer .chart-subtitle`);
        const selectElement = document.getElementById('options');
        const selectedText = selectElement.options[selectElement.selectedIndex].text;

        if (selectedValue === "individual") {
            subTitle.textContent = selectedText + " - Last 7 Days";
            fetchData('individual');
        } else if (selectedValue === "service") {
            subTitle.textContent = selectedText + " - Last 7 Days";
            fetchData('service');
        }

        // Update ARIA live region
        const liveRegion = document.getElementById('aria-live-account');
            liveRegion.textContent = `Data updated for ${selectedText} - Last 7 Days`;
        };

        document.addEventListener('DOMContentLoaded', function() {
            // Initialize activityChart chart and table with service data by default
            fetchData('service');

            // Add event listener to the dropdown
            const dropdown = document.getElementById('options');
            dropdown.addEventListener('change', handleDropdownChange);
        });

        // Resize chart on window resize
        window.addEventListener('resize', function() {
            const selectedValue = document.getElementById('options').value;
            handleDropdownChange({ target: { value: selectedValue } });
        });

        // Export functions for testing
        window.createChart = createChart;
        window.createTable = createTable;
        window.handleDropdownChange = handleDropdownChange;
        window.fetchData = fetchData;
    }

})(window);