// .gitea/scripts/getLatestRunWithArtifacts.js
// Finds the latest successful *workflow run* that exposes all required artifacts.
// Uses API if available; otherwise falls back to HTML scraping for run listing and artifacts.

/* ENVIRONMENT:
   - GITEA_BASE_URL   e.g. https://code.example.com
   - OWNER            repo owner, e.g. mz
   - REPO             repo name, e.g. DiunaBI
   - GITEA_PAT        personal access token with repo read permissions
   - SCAN_LIMIT       optional; max number of runs to scan (default: 100)
   - REQUIRED_ARTIFACTS  comma-separated list, default "frontend,webapi"
*/

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

const BASE   = process.env.GITEA_BASE_URL;
const OWNER  = process.env.OWNER;
const REPO   = process.env.REPO;
const TOKEN  = process.env.GITEA_PAT;

const SCAN_LIMIT = Number(process.env.SCAN_LIMIT || "100");
const REQUIRED_ARTIFACTS = (process.env.REQUIRED_ARTIFACTS || "frontend,webapi")
    .split(",").map(s => s.trim()).filter(Boolean);

if (!BASE || !OWNER || !REPO) {
    console.error("Missing one of: GITEA_BASE_URL, OWNER, REPO");
    process.exit(1);
}
if (!TOKEN) { console.error("Missing GITEA_PAT"); process.exit(1); }

const cacheDir = path.join(".gitea", ".cache");
fs.mkdirSync(cacheDir, { recursive: true });

async function http(url, accept = "application/json") {
    const res = await fetch(url, {
        headers: { Authorization: `token ${TOKEN}`, Accept: accept },
    });
    return res;
}

async function apiJSON(url) {
    const res = await http(url, "application/json");
    if (!res.ok) {
        const t = await res.text().catch(() => "");
        const err = new Error(`API ${res.status} for ${url}\n${t}`);
        err.status = res.status;
        throw err;
    }
    return res.json();
}

function normalizeRunList(resp) {
    if (Array.isArray(resp)) return resp;
    return resp?.runs || resp?.workflow_runs || resp?.data || resp?.items || [];
}

function isSuccessfulRun(r) {
    const s = String(r.status || "").toLowerCase();
    const c = String(r.conclusion || "").toLowerCase();
    return s === "success" || (s === "completed" && c === "success");
}

/* -------- Run listing -------- */
async function tryApiListRuns() {
    const pageSize = Math.min(50, SCAN_LIMIT);
    const out = [];
    let page = 1;

    while (out.length < SCAN_LIMIT) {
        const url = `${BASE}/api/v1/repos/${OWNER}/${REPO}/actions/runs?limit=${pageSize}&page=${page}`;
        let resp;
        try {
            resp = await apiJSON(url);
        } catch (e) {
            if (e.status === 404) return null; // endpoint not available
            throw e;
        }
        const chunk = normalizeRunList(resp);
        if (!Array.isArray(chunk) || chunk.length === 0) break;
        out.push(...chunk);
        if (chunk.length < pageSize) break;
        page += 1;
    }
    return out.slice(0, SCAN_LIMIT);
}

async function listRunsFromHtml() {
    const url = `${BASE}/${OWNER}/${REPO}/actions`;
    const res = await http(url, "text/html");
    if (!res.ok) {
        const t = await res.text().catch(() => "");
        throw new Error(`HTML ${res.status} for ${url}\n${t}`);
    }
    const html = await res.text();
    const runIds = Array.from(html.matchAll(/\/actions\/runs\/(\d+)/g))
        .map(m => Number(m[1]))
        .filter(n => Number.isFinite(n));
    const unique = [...new Set(runIds)].sort((a, b) => b - a);
    return unique.slice(0, SCAN_LIMIT).map(id => ({ id }));
}

/* -------- Artifact listing -------- */
async function readArtifactNames(runId) {
    const url = `${BASE}/api/v1/repos/${OWNER}/${REPO}/actions/runs/${runId}/artifacts`;
    try {
        const json = await apiJSON(url);
        const list = Array.isArray(json?.artifacts)
            ? json.artifacts
            : (Array.isArray(json) ? json : []);
        return list.map(a => a?.name).filter(Boolean);
    } catch (e) {
        // fallback: artifacts tab in HTML
        const res = await http(`${BASE}/${OWNER}/${REPO}/actions/runs/${runId}?_tab=artifacts`, "text/html");
        if (!res.ok) return [];
        const html = await res.text();
        return Array.from(html.matchAll(/\/actions\/artifacts\/\d+[^>]*>([^<]+)</g))
            .map(m => m[1].trim())
            .filter(Boolean);
    }
}

/* -------- Main -------- */
(async () => {
    let runs = await tryApiListRuns();
    if (!runs) {
        console.log("Runs API not available on this Gitea – falling back to HTML scraping.");
        runs = await listRunsFromHtml();
    }

    if (!runs.length) {
        console.error("No workflow runs found.");
        process.exit(1);
    }

    const candidates = runs
        .filter(r => r && r.id != null)
        .sort((a, b) => (b.id ?? 0) - (a.id ?? 0));

    console.log(`Scanning ${candidates.length} runs for artifacts: ${REQUIRED_ARTIFACTS.join(", ")}`);

    let pickedId = null;

    for (const r of candidates) {
        const runId = r.id;
        if (r.status && r.conclusion && !isSuccessfulRun(r)) {
            console.log(`Run ${runId}: not successful`);
            continue;
        }
        try {
            const names = await readArtifactNames(runId);
            const ok = REQUIRED_ARTIFACTS.every(req => names.includes(req));
            if (ok) { pickedId = runId; break; }
            console.log(`Run ${runId}: lacks required artifacts (has: ${names.join(", ") || "none"})`);
        } catch (e) {
            console.log(`Run ${runId}: cannot read artifacts -> ${String(e.message).split("\n")[0]}`);
        }
    }

    if (!pickedId) {
        console.error("No run exposes all required artifacts.");
        process.exit(1);
    }

    fs.writeFileSync(path.join(cacheDir, "run_id"), String(pickedId), "utf8");
    if (process.env.GITHUB_OUTPUT) {
        fs.appendFileSync(process.env.GITHUB_OUTPUT, `run_id=${pickedId}\n`);
    }
    console.log(`Picked run_id=${pickedId}`);
})().catch(err => {
    console.error(err.stack || err.message || String(err));
    process.exit(1);
});