import { mkdirSync, writeFileSync } from 'node:fs';
import { Chart, registerables } from 'chart.js';
import { Canvas } from 'skia-canvas';
// Register all Chart.js controllers
Chart.register(...registerables);
export function formatNpmSummary(summary, platformMetrics) {
    let totalDownloads = 0;
    let totalMonthlyDownloads = 0;
    let totalWeeklyDownloads = 0;
    let totalDailyDownloads = 0;
    summary += `| Package | Downloads | Monthly Downloads | Weekly Downloads | Daily Downloads |\n`;
    summary += `| --- | --- | --- | --- | --- |\n`;
    for (const metric of platformMetrics) {
        const downloads = metric.metrics?.downloadsTotal || 0;
        const monthlyDownloads = metric.metrics?.downloadsMonthly || 0;
        const weeklyDownloads = metric.metrics?.downloadsWeekly || 0;
        const dailyDownloads = metric.metrics?.downloadsDaily || 0;
        totalDownloads += downloads;
        totalMonthlyDownloads += monthlyDownloads;
        totalWeeklyDownloads += weeklyDownloads;
        totalDailyDownloads += dailyDownloads;
        summary += `| ${metric.name} | ${downloads.toLocaleString()} | ${monthlyDownloads.toLocaleString()} | ${weeklyDownloads.toLocaleString()} | ${dailyDownloads.toLocaleString()} |\n`;
    }
    summary += `| **Total** | **${totalDownloads.toLocaleString()}** | **${totalMonthlyDownloads.toLocaleString()}** | **${totalWeeklyDownloads.toLocaleString()}** | **${totalDailyDownloads.toLocaleString()}** | | | | |\n`;
    return summary;
}
// Convert a list of dates into a list of Months
function groupByMonth(dateRange) {
    const months = {};
    for (const range of dateRange) {
        const month = new Date(range.day).toLocaleDateString('en-US', { month: 'short', year: '2-digit' });
        if (!months[month]) {
            months[month] = range.downloads;
        }
        else {
            months[month] += range.downloads;
        }
    }
    return months;
}
function groupByMonthCumulative(dateRange) {
    const months = {};
    for (const range of dateRange) {
        const month = new Date(range.day).toLocaleDateString('en-US', { month: 'short', year: '2-digit' });
        if (!months[month]) {
            months[month] = range.downloads;
        }
        else {
            months[month] += range.downloads;
        }
    }
    let cumulativeDownloads = 0;
    for (const month in months) {
        cumulativeDownloads += months[month];
        months[month] = cumulativeDownloads;
    }
    return months;
}
export async function createDownloadsPerMonthChart(metric, outputPath) {
    const downloadsRange = metric.metrics?.downloadsRange || [];
    const svgOutputPath = `${outputPath}/${metric.name}-new-downloads-by-month.svg`;
    const groupedDownloads = groupByMonth(downloadsRange);
    const canvas = new Canvas(1000, 800);
    const chart = new Chart(canvas, {
        type: 'line',
        data: {
            labels: Object.keys(groupedDownloads),
            datasets: [{
                    label: metric.name,
                    data: Object.values(groupedDownloads),
                    backgroundColor: 'rgba(75, 192, 192, 0.2)',
                    borderColor: 'rgba(75, 192, 192, 1)',
                    borderWidth: 3,
                    fill: true,
                    tension: 0.1
                }]
        },
        options: {
            scales: {
                x: {
                    time: {
                        unit: 'month',
                        displayFormats: {
                            month: 'MMM DD'
                        }
                    },
                    title: {
                        display: true,
                        text: 'Date'
                    }
                },
                y: {
                    title: {
                        display: true,
                        text: 'Downloads per month'
                    },
                }
            }
        }
    });
    const svgBuffer = await canvas.toBuffer('svg', { matte: 'white' });
    writeFileSync(svgOutputPath, svgBuffer);
    chart.destroy();
    return svgOutputPath;
}
export async function createCumulativeDownloadsChart(metric, outputPath) {
    const downloadsRange = metric.metrics?.downloadsRange || [];
    const svgOutputPath = `${outputPath}/${metric.name}-cumulative-downloads.svg`;
    const groupedDownloads = groupByMonthCumulative(downloadsRange);
    const canvas = new Canvas(1000, 800);
    const chart = new Chart(canvas, {
        type: 'line',
        data: {
            labels: Object.keys(groupedDownloads),
            datasets: [{
                    label: metric.name,
                    data: Object.values(groupedDownloads),
                    backgroundColor: 'rgba(75, 192, 192, 0.2)',
                    borderColor: 'rgba(75, 192, 192, 1)',
                    borderWidth: 3,
                    fill: true,
                    tension: 0.1
                }]
        },
        options: {
            scales: {
                x: {
                    time: {
                        unit: 'month',
                        displayFormats: {
                            month: 'MMM DD'
                        }
                    },
                    title: {
                        display: true,
                        text: 'Date'
                    }
                },
                y: {
                    title: {
                        display: true,
                        text: 'Downloads per month'
                    },
                }
            }
        }
    });
    const svgBuffer = await canvas.toBuffer('svg', { matte: 'white' });
    writeFileSync(svgOutputPath, svgBuffer);
    chart.destroy();
    return svgOutputPath;
}
export async function createNpmChart(platformMetrics, outputPath) {
    const svgOutputPathList = [];
    for (const metric of platformMetrics) {
        const svgOutputPath = await createDownloadsPerMonthChart(metric, outputPath);
        svgOutputPathList.push(svgOutputPath);
        const svgOutputPathCumulative = await createCumulativeDownloadsChart(metric, outputPath);
        svgOutputPathList.push(svgOutputPathCumulative);
    }
    return svgOutputPathList;
}
export async function addNpmDetails(summary, platformMetrics) {
    const outputPath = './charts/npm';
    mkdirSync(outputPath, { recursive: true });
    const svgOutputPathList = await createNpmChart(platformMetrics, outputPath);
    for (const svgOutputPath of svgOutputPathList) {
        summary += `![${svgOutputPath}](${svgOutputPath})\n`;
    }
    return summary;
}