const fs = require('fs');
const path = require('path');

const summaryPath = path.resolve(__dirname, '../server/coverage/coverage-summary.json');
if (!fs.existsSync(summaryPath)) {
    console.error("No coverage summary found. Run 'npm run test:coverage' first.");
    process.exit(1);
}

const summary = JSON.parse(fs.readFileSync(summaryPath, 'utf8'));

// 初始阈值仅关键模块 lines>=70%，全局先告警
const KEY_MODULES = [
    "src/services/featureFlags",
    "src/services/verification",
    "src/services/integrations/dispatcher.js",
    "src/services/integrations/outbox.js",
    "src/services/integrations/erp.js",
    "src/utils/workflow.js"
];

let allPassed = true;
const messages = [];

for (const [file, stats] of Object.entries(summary)) {
    if (file === "total") continue;

    const isKeyModule = KEY_MODULES.some(key => file.includes(key));
    if (isKeyModule) {
        const linesCov = stats.lines.pct;
        if (linesCov < 70) {
            allPassed = false;
            messages.push(`FAIL: ${file} lines coverage is ${linesCov}%, which is below the 70% threshold.`);
        } else {
            messages.push(`PASS: ${file} lines coverage is ${linesCov}% (>= 70%).`);
        }
    }
}

const globalLines = summary.total?.lines?.pct ?? 0;
messages.push(`Global lines coverage is ${globalLines}%. (Warn-only)`);

console.log("=== Coverage Gate Report ===");
console.log(messages.join("\n"));

if (process.env.GITHUB_STEP_SUMMARY) {
    fs.appendFileSync(process.env.GITHUB_STEP_SUMMARY, `\n## Coverage Gate\n\n\`\`\`text\n${messages.join("\n")}\n\`\`\`\n`);
}

const isPR = process.env.GITHUB_EVENT_NAME === "pull_request";

if (!allPassed) {
    if (isPR) {
        console.log("WARN: Coverage is below threshold. PRs will not be blocked currently, but please fix it.");
        process.exit(0);
    } else {
        console.error("ERROR: Coverage is below threshold and the branch is NOT a PR. Failing the gate.");
        process.exit(1);
    }
} else {
    console.log("Coverage gate passed successfully.");
    process.exit(0);
}