// A canned Gitea instance served through a fetch() stub.
const BASE = "https://gitea.test/api/v1";

const now = new Date();
const iso = (minutesAgo) => new Date(now.getTime() - minutesAgo * 60000).toISOString();

const RUNS = [
    { id: 101, run_number: 12, display_title: "Fix the flaky test", path: ".gitea/workflows/ci.yml",
      event: "push", status: "completed", conclusion: "success", head_branch: "feature/login",
      head_sha: "abc1234def", created_at: iso(30), started_at: iso(29), completed_at: iso(26),
      html_url: "https://gitea.test/acme/widget/actions/runs/101", actor: { login: "alice" } },
    { id: 102, run_number: 13, display_title: "Add login form", path: ".gitea/workflows/ci.yml",
      event: "pull_request", status: "running", conclusion: "", head_branch: "feature/login",
      head_sha: "def5678abc", created_at: iso(4), started_at: iso(4), completed_at: null,
      html_url: "https://gitea.test/acme/widget/actions/runs/102", actor: { login: "bob" } },
    { id: 103, run_number: 5, display_title: "Nightly", path: ".gitea/workflows/nightly.yml",
      event: "schedule", status: "completed", conclusion: "failure", head_branch: "main",
      head_sha: "999aaa111", created_at: iso(300), started_at: iso(300), completed_at: iso(295),
      html_url: "https://gitea.test/acme/widget/actions/runs/103", actor: { login: "ci" } },
];

const JOBS = {
    101: [{ id: 9001, name: "build", status: "completed", conclusion: "success",
            started_at: iso(29), completed_at: iso(27), runner_name: "runner-1",
            html_url: "https://gitea.test/acme/widget/actions/runs/101/jobs/0",
            steps: [{ number: 1, name: "Checkout", status: "completed", conclusion: "success", started_at: iso(29), completed_at: iso(29) },
                    { number: 2, name: "Test", status: "completed", conclusion: "success", started_at: iso(29), completed_at: iso(27) }] }],
    102: [{ id: 9002, name: "build", status: "running", conclusion: "", started_at: iso(4),
            completed_at: null, steps: [] }],
    103: [{ id: 9003, name: "nightly", status: "completed", conclusion: "failure",
            started_at: iso(300), completed_at: iso(295), steps: [] }],
};

const ARTIFACTS = {
    101: [{ id: 555, name: "coverage", size_in_bytes: 20480, expired: false,
            archive_download_url: BASE + "/repos/acme/widget/actions/artifacts/555/zip" }],
};

const DIFF_HUNK = [
    "@@ -10,4 +10,7 @@ function login() {",
    "   const form = document.querySelector('form');",
    "-  form.submit();",
    "+  if (!validate(form)) {",
    "+    return;",
    "+  }",
    "+  form.submit();",
].join("\n");

const PULLS = [
    { number: 7, title: "Add login form", state: "open", draft: false, merged: false, mergeable: true,
      user: { login: "bob" }, updated_at: iso(3), created_at: iso(120),
      head: { ref: "feature/login", label: "acme:feature/login", sha: "def5678abc" },
      base: { ref: "main", label: "acme:main" },
      body: "Adds a login form and validates it before submit.",
      html_url: "https://gitea.test/acme/widget/pulls/7" },
    { number: 6, title: "Bump deps", state: "open", draft: true, merged: false, mergeable: true,
      user: { login: "alice" }, updated_at: iso(600), created_at: iso(900),
      head: { ref: "chore/deps", label: "acme:chore/deps", sha: "111222333" },
      base: { ref: "main", label: "acme:main" }, body: "",
      html_url: "https://gitea.test/acme/widget/pulls/6" },
];

const REVIEWS = {
    7: [{ id: 4001, state: "REQUEST_CHANGES", body: "Please guard the submit.", comments_count: 1,
          user: { login: "alice" }, submitted_at: iso(10),
          html_url: "https://gitea.test/acme/widget/pulls/7#pullrequestreview-4001" },
        { id: 4002, state: "APPROVED", body: "LGTM now", comments_count: 0,
          user: { login: "carol" }, submitted_at: iso(2) }],
    6: [],
};

const REVIEW_COMMENTS = {
    4001: [{ id: 7001, body: "Guard this before submitting.", path: "src/login.js", position: 13,
             pull_request_review_id: 4001, user: { login: "alice" }, created_at: iso(10),
             diff_hunk: DIFF_HUNK, resolver: null,
             html_url: "https://gitea.test/acme/widget/pulls/7#issuecomment-7001" }],
};

const FILES = {
    7: [{ filename: "src/login.js", status: "modified", additions: 4, deletions: 1,
          html_url: "https://gitea.test/acme/widget/pulls/7/files#src-login-js" },
        { filename: "src/new.js", status: "added", additions: 12, deletions: 0 }],
    6: [{ filename: "package.json", status: "modified", additions: 2, deletions: 2 }],
};

const PR_DIFF = [
    "diff --git a/src/login.js b/src/login.js",
    "index 1111111..2222222 100644",
    "--- a/src/login.js",
    "+++ b/src/login.js",
    DIFF_HUNK,
    "diff --git a/src/new.js b/src/new.js",
    "new file mode 100644",
    "index 0000000..3333333",
    "--- /dev/null",
    "+++ b/src/new.js",
    "@@ -0,0 +1,2 @@",
    "+export function noop() {}",
    "",
].join("\n");

const SECRETS = [{ name: "DEPLOY_KEY", created_at: iso(5000), description: "" }];
const VARIABLES = [{ name: "REGISTRY", data: "registry.example.com" }];

const calls = [];

function json(body, status = 200) {
    const payload = JSON.stringify(body);
    return {
        ok: status < 400, status,
        text: async () => payload,
        json: async () => body,
        arrayBuffer: async () => new TextEncoder().encode(payload).buffer,
    };
}

function plain(body, status = 200) {
    return {
        ok: status < 400, status,
        text: async () => body,
        json: async () => JSON.parse(body),
        arrayBuffer: async () => new TextEncoder().encode(body).buffer,
    };
}

global.fetch = async (url, init) => {
    const method = (init && init.method) || "GET";
    const parsed = new URL(url);
    const p = parsed.pathname.replace("/api/v1", "");
    const q = parsed.searchParams;
    calls.push(method + " " + p + (q.toString() ? "?" + q.toString() : ""));

    const auth = init && init.headers && init.headers["Authorization"];
    if (!auth) return json({ message: "token required" }, 401);

    const page = Number(q.get("page") || 1);
    const first = (list) => (page > 1 ? [] : list);

    if (p === "/version") return json({ version: "1.27.2" });
    if (p === "/user") return json({ login: "tester", id: 1 });
    if (p === "/user/repos") return json(first([
        { name: "widget", full_name: "acme/widget", owner: { login: "acme" },
          html_url: "https://gitea.test/acme/widget", default_branch: "main" }]));

    const m = p.match(/^\/repos\/([^/]+)\/([^/]+)(\/.*)?$/);
    if (!m) return json({ message: "no route for " + p }, 404);
    const rest = m[3] || "";

    if (rest === "") {
        // The instance answers SSH on a different hostname than its web UI,
        // which is what host-alias detection keys off.
        return json({
            name: m[2],
            full_name: m[1] + "/" + m[2],
            html_url: "https://gitea.test/" + m[1] + "/" + m[2],
            clone_url: "https://gitea.test/" + m[1] + "/" + m[2] + ".git",
            ssh_url: "git@ssh.gitea.test:" + m[1] + "/" + m[2] + ".git",
        });
    }
    if (rest === "/branches") return json(first([{ name: "main" }, { name: "feature/login" }]));
    if (rest === "/actions/runs") {
        let runs = RUNS;
        if (q.get("branch")) runs = runs.filter((r) => r.head_branch === q.get("branch"));
        return json({ total_count: runs.length, workflow_runs: runs });
    }
    if (rest === "/actions/workflows") {
        return json({ workflows: [{ id: 1, name: "CI", path: ".gitea/workflows/ci.yml" }] });
    }

    let sub = rest.match(/^\/actions\/runs\/(\d+)\/jobs$/);
    if (sub) return json({ jobs: JOBS[sub[1]] || [] });
    sub = rest.match(/^\/actions\/runs\/(\d+)\/artifacts$/);
    if (sub) return json({ artifacts: ARTIFACTS[sub[1]] || [] });
    sub = rest.match(/^\/actions\/jobs\/(\d+)\/logs$/);
    if (sub) return plain("Starting job " + sub[1] + "\nDone\n");
    sub = rest.match(/^\/actions\/artifacts\/(\d+)\/zip$/);
    if (sub) return plain("PKfake-zip-bytes");
    if (/^\/actions\/runs\/\d+\/(rerun|rerun-failed-jobs|cancel)$/.test(rest)) return json(null, 204);
    if (/^\/actions\/runs\/\d+\/jobs\/\d+\/rerun$/.test(rest)) return json(null, 204);

    if (rest === "/actions/secrets") return json(first(SECRETS));
    if (rest === "/actions/variables") return json(first(VARIABLES));
    if (/^\/actions\/secrets\/[^/]+$/.test(rest)) return json(null, 204);
    if (/^\/actions\/variables\/[^/]+$/.test(rest)) return json(null, 204);

    if (rest === "/pulls" && method === "GET") return json(first(PULLS));
    if (rest === "/pulls" && method === "POST") {
        return json({ number: 8, html_url: "https://gitea.test/acme/widget/pulls/8" });
    }

    sub = rest.match(/^\/pulls\/(\d+)$/);
    if (sub) return json(PULLS.find((x) => x.number === Number(sub[1])) || null);
    sub = rest.match(/^\/pulls\/(\d+)\.diff$/);
    if (sub) return plain(PR_DIFF);
    sub = rest.match(/^\/pulls\/(\d+)\/files$/);
    if (sub) return json(first(FILES[sub[1]] || []));
    sub = rest.match(/^\/pulls\/(\d+)\/reviews$/);
    if (sub && method === "GET") return json(first(REVIEWS[sub[1]] || []));
    if (sub && method === "POST") return json({ id: 4003 });
    sub = rest.match(/^\/pulls\/(\d+)\/reviews\/(\d+)\/comments$/);
    if (sub) return json(REVIEW_COMMENTS[sub[2]] || []);
    if (/^\/pulls\/\d+\/merge$/.test(rest)) return json(null, 204);
    if (/^\/pulls\/\d+\/comments\/\d+\/replies$/.test(rest)) return json({ id: 7002 });
    if (/^\/pulls\/comments\/\d+\/(un)?resolve$/.test(rest)) return json(null, 204);

    sub = rest.match(/^\/issues\/(\d+)$/);
    if (sub) return json({ number: Number(sub[1]), state: "closed" });
    if (/^\/issues\/\d+\/timeline$/.test(rest)) {
        return json(first([{ type: "comment", body: "Looks good", user: { login: "carol" }, created_at: iso(5) }]));
    }
    if (/^\/issues\/\d+\/comments$/.test(rest)) return json(first([]));

    return json({ message: "no route for " + p }, 404);
};

module.exports = { calls, RUNS, PULLS, DIFF_HUNK, PR_DIFF };