#!/usr/bin/env node

import { execFileSync } from 'node:child_process';
import fs from 'node:fs';
import { fileURLToPath } from 'node:url';
import path from 'node:path';
import { versionFromTag } from './release-artifact-checks.mjs';

export const REQUIRED_RELEASE_CHECKS = Object.freeze(['verify', 'node20', 'e2e']);

export function parseCheckRuns(text) {
    return String(text).split(/\r?\n/u).filter(Boolean).map(line => {
        const [name, conclusion, url = ''] = line.split('\t');
        if (!name || !conclusion) throw new Error(`Invalid check-run record: ${line}`);
        return { name, conclusion, url };
    });
}

export function validateRequiredChecks(checkRuns, required = REQUIRED_RELEASE_CHECKS) {
    for (const name of required) {
        const matches = checkRuns.filter(check => check.name === name);
        if (matches.length === 0) throw new Error(`Required check is missing for the release commit: ${name}`);
        if (matches.some(check => check.conclusion !== 'success')) {
            const conclusions = matches.map(check => check.conclusion).join(', ');
            throw new Error(`Required check ${name} did not succeed: ${conclusions}`);
        }
    }
}

function run(command, args) {
    return execFileSync(command, args, {
        cwd: process.cwd(),
        encoding: 'utf8',
        stdio: ['ignore', 'pipe', 'pipe']
    }).trim();
}

export function validateRepositoryName(repo) {
    if (!/^[^/\s]+\/[^/\s]+$/u.test(repo || '')) {
        throw new Error(`Invalid GitHub repository: ${repo || '<empty>'}`);
    }
    return repo;
}

export function validateVersionSnapshot(expectedVersion, snapshot) {
    for (const [label, actualVersion] of Object.entries(snapshot)) {
        if (actualVersion !== expectedVersion) {
            throw new Error(`${label} version ${actualVersion || '<missing>'} does not match tag version ${expectedVersion}`);
        }
    }
}

export function validateReleaseSourceVersion(expectedVersion, repoRoot = process.cwd()) {
    const readJson = relativePath => JSON.parse(fs.readFileSync(path.join(repoRoot, relativePath), 'utf8'));
    const packageJson = readJson('package.json');
    const packageLock = readJson('package-lock.json');
    const manifest = readJson('extension/manifest.base.json');
    const websiteVersion = readJson('website/version.json');
    const constants = fs.readFileSync(path.join(repoRoot, 'shared/constants.js'), 'utf8');
    const appVersion = /export const APP_VERSION = ["']([^"']+)["']/u.exec(constants)?.[1] || '';
    validateVersionSnapshot(expectedVersion, {
        'package.json': packageJson.version,
        'package-lock.json': packageLock.version,
        'package-lock root package': packageLock.packages?.['']?.version,
        'extension manifest': manifest.version,
        'shared constants': appVersion,
        'website/version.json': websiteVersion.version
    });
}

export function verifyReleaseRef({ tag, repo }) {
    const version = versionFromTag(tag);
    validateRepositoryName(repo);
    validateReleaseSourceVersion(version);
    const tagRef = `refs/tags/${tag}`;
    if (run('git', ['cat-file', '-t', tagRef]) !== 'tag') {
        throw new Error(`${tag} must be an annotated tag`);
    }
    const tagCommit = run('git', ['rev-list', '-n', '1', tagRef]);
    const mainCommit = run('git', ['rev-parse', 'origin/main']);
    if (tagCommit !== mainCommit) {
        throw new Error(`Release tag ${tag} points to ${tagCommit}, but origin/main is ${mainCommit}`);
    }

    const checks = parseCheckRuns(run('gh', [
        'api', `repos/${repo}/commits/${tagCommit}/check-runs`,
        '--jq', '.check_runs[] | [.name, .conclusion, .html_url] | @tsv'
    ]));
    validateRequiredChecks(checks);
    return { version, tagCommit };
}

function main() {
    const tag = process.env.GITHUB_REF_NAME || '';
    const repo = process.env.GITHUB_REPOSITORY || '';
    const outputPath = process.env.GITHUB_OUTPUT || '';
    const result = verifyReleaseRef({ tag, repo });
    if (!outputPath) throw new Error('GITHUB_OUTPUT is required');
    fs.appendFileSync(outputPath, `version=${result.version}\ntag_commit=${result.tagCommit}\n`, 'utf8');
    console.log(`Release preflight accepted ${tag} at ${result.tagCommit}`);
}

const isMainModule = process.argv[1] && fileURLToPath(import.meta.url) === process.argv[1];
if (isMainModule) {
    try {
        main();
    } catch (error) {
        console.error(`Release preflight failed: ${error.message}`);
        process.exitCode = 1;
    }
}