/* eslint max-len: 0 */
const path = require('path');
const fs = require('fs');
const process = require('process');
const {execSync} = require('child_process');
const zhc = require('zigbee-herdsman-converters');

const z2mTillVersion = process.argv[2];
const zhcTillVersion = process.argv[3];
const zhTillVersion = process.argv[4];

const changelogs = [
    {tillVersion: z2mTillVersion, project: 'koenkk/zigbee2mqtt',
        contents: fs.readFileSync(path.join(__dirname, '..', 'CHANGELOG.md'), 'utf-8').split('\n')},
    {tillVersion: zhcTillVersion, project: 'koenkk/zigbee-herdsman-converters',
        contents: fs.readFileSync(path.join(__dirname, '..', 'node_modules', 'zigbee-herdsman-converters', 'CHANGELOG.md'), 'utf-8').split('\n')},
    {tillVersion: zhTillVersion, project: 'koenkk/zigbee-herdsman',
        contents: fs.readFileSync(path.join(__dirname, '..', 'node_modules', 'zigbee-herdsman', 'CHANGELOG.md'), 'utf-8').split('\n')},
];

const releaseRe = /## \[(.+)\]/;
const changes = {features: [], fixes: [], detect: [], add: [], error: []};
let context = null;
const changeRe = [
    /^\* (\*\*(.+):\*\*)?(.+)\((\[#\d+\]\(.+\))\) \(\[.+\]\(https:.+\/(.+)\)\)$/,
    /^\* (\*\*(.+):\*\*)?(.+)(https:\/\/github\.com.+) \(\[.+\]\(https:.+\/(.+)\)\)$/,
    /^\* (\*\*(.+):\*\*)?(.+)() \(\[.+\]\(https:.+\/(.+)\)\)$/,
];

let commitUserLookup = {};
const commitUserFile = path.join(__dirname, 'commit-user-lookup.json');
if (fs.existsSync(commitUserFile)) {
    commitUserLookup = JSON.parse(fs.readFileSync(commitUserFile, 'utf8'));
}

for (const changelog of changelogs) {
    for (const line of changelog.contents) {
        const releaseMatch = line.match(releaseRe);
        const changeMatch = changeRe.map((re) => line.match(re)).find((e) => e);
        if (releaseMatch) {
            if (releaseMatch[1] === changelog.tillVersion) {
                break;
            }
        } else if (line === '### Features') {
            context = 'features';
        } else if (line === '### Bug Fixes') {
            context = 'fixes';
        } else if (line.startsWith('* **ignore:**')) {
            continue;
        } else if (changeMatch) {
            let localContext = changeMatch[2] ? changeMatch[2] : context;
            if (!changes[localContext]) throw new Error(`Unknown context: ${localContext}`);

            const commitUserKey = `${changelog.project}-${changeMatch[5]} `;
            let user = commitUserKey in commitUserLookup ? commitUserLookup[commitUserKey] :
                execSync(`curl -s https://api.github.com/repos/${changelog.project}/commits/${changeMatch[5]} | jq -r '.author.login'`).toString().trim();
            if (user !== 'null') commitUserLookup[commitUserKey] = user;
            const messages = [];
            let message = changeMatch[3].trim();
            if (message.endsWith('.')) message = message.substring(0, message.length - 1);

            const otherUser = message.match(/\[@(.+)\]\(https:\/\/github.com\/.+\)/) || message.match(/@(.+)/);
            if (otherUser) {
                user = otherUser[1];
                message = message.replace(otherUser[0], '');
            }

            if (localContext === 'add') {
                for (const model of message.split(',')) {
                    const definition = zhc.definitions.find((d) => d.model === model.trim());
                    if (definition) {
                        messages.push(`\`${definition.model}\` ${definition.vendor} ${definition.description}`);
                    } else {
                        changes['error'].push(`${line} (model '${model}' does not exist)`);
                    }
                }
            } else {
                messages.push(message);
            }

            let issue = changeMatch[4].trim();
            if (issue && !issue.startsWith('[#')) issue = `[#${issue.split('/').pop()}](${issue})`;
            if (!issue) {
                issue = '_NO_ISSUE_';
                localContext = 'error';
            }

            messages.forEach((m) => changes[localContext].push(`- ${issue} ${m} (@${user})`));
        } else if (line === '# Changelog' || !line) {
            continue;
        } else {
            throw new Error(`Unmatched line: ${line}`);
        }
    }
}

let result = '';
const names = [
    ['features', 'Improvements'],
    ['fixes', 'Fixes'],
    ['add', 'New supported devices'],
    ['detect', 'Fixed device detections'],
    ['error', 'Changelog generator error'],
];
for (const name of names) {
    result += `# ${name[1]}\n`;
    if (name[0] === 'add') {
        result += `This release adds support for ${changes['add'].length} devices: \n`;
    }
    changes[name[0]].forEach((e) => result += `${e}\n`);
    result += '\n';
}

fs.writeFileSync(commitUserFile, JSON.stringify(commitUserLookup), 'utf-8');

console.log(result.trim());