/**
 * Tests for `check-registry-eject.ts`.
 *
 * Builds fixtures filesystems on disk under `mkdtemp` and exercises
 * the exported helpers (`audit`, `loadEntry`) directly. The script's
 * `main()` is exercised indirectly through these helpers — its
 * top-level behaviour (process.exit) is covered by the lint gate
 * itself running on real source.
 */

import { afterEach, beforeEach, describe, expect, it } from "@suaveplan/testing/runner";
import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { audit, loadEntry } from "./check-registry-eject.js";

let workDir: string;

beforeEach(async () => {
    workDir = await mkdtemp(join(tmpdir(), "registry-eject-"));
});

afterEach(async () => {
    await rm(workDir, { recursive: true, force: true });
});

async function writeJson(rel: string, body: unknown): Promise<string> {
    const full = join(workDir, rel);
    await mkdir(join(full, ".."), { recursive: true });
    await writeFile(full, JSON.stringify(body, null, 2), "utf8");
    return full;
}

async function writeFixture(rel: string, content = ""): Promise<string> {
    const full = join(workDir, rel);
    await mkdir(join(full, ".."), { recursive: true });
    await writeFile(full, content, "utf8");
    return full;
}

describe("loadEntry", () => {
    it("loads a valid registry entry", { timeout: 5000 }, async () => {
        const entry = await writeJson("button.json", {
            name: "@suaveplan/button",
            type: "registry:ui",
            files: [{ path: "button.tsx", type: "registry:ui" }],
        });
        const result = await loadEntry(entry);
        expect("error" in result).toBe(false);
    });

    it("rejects an entry without a name", { timeout: 5000 }, async () => {
        const entry = await writeJson("bad.json", {
            type: "registry:ui",
            files: [],
        });
        const result = await loadEntry(entry);
        expect("error" in result).toBe(true);
    });

    it("rejects an entry with non-array files", {
        timeout: 5000,
    }, async () => {
        const entry = await writeJson("bad.json", {
            name: "x",
            type: "registry:ui",
            files: "oops",
        });
        const result = await loadEntry(entry);
        expect("error" in result).toBe(true);
    });

    it("rejects malformed JSON", { timeout: 5000 }, async () => {
        const entry = await writeFixture("bad.json", "{ not json");
        const result = await loadEntry(entry);
        expect("error" in result).toBe(true);
    });
});

describe("audit", () => {
    it("returns no diagnostics on a clean fixtures tree", {
        timeout: 5000,
    }, async () => {
        const componentsDir = join(workDir, "src/components");
        await writeFixture("src/components/button/button.tsx", "export {}");
        const entry = await writeJson("registry/r/button.json", {
            name: "@x/button",
            type: "registry:ui",
            files: [{ path: "button.tsx", type: "registry:ui" }],
        });
        const diagnostics = await audit({
            registryEntries: [entry],
            componentDirs: ["button"],
            componentsDir,
        });
        expect(diagnostics).toEqual([]);
    });

    it("flags a component directory with no registry entry", {
        timeout: 5000,
    }, async () => {
        const componentsDir = join(workDir, "src/components");
        await writeFixture("src/components/button/button.tsx", "export {}");
        const diagnostics = await audit({
            registryEntries: [],
            componentDirs: ["button"],
            componentsDir,
        });
        expect(
            diagnostics.find(
                (d) => d.kind === "MISSING_REGISTRY_ENTRY"
            )?.message
        ).toMatch(/button/);
    });

    it("flags a registry entry whose source file is missing", {
        timeout: 5000,
    }, async () => {
        const componentsDir = join(workDir, "src/components");
        await mkdir(join(componentsDir, "ghost"), { recursive: true });
        const entry = await writeJson("registry/r/ghost.json", {
            name: "@x/ghost",
            type: "registry:ui",
            files: [{ path: "ghost.tsx", type: "registry:ui" }],
        });
        const diagnostics = await audit({
            registryEntries: [entry],
            componentDirs: ["ghost"],
            componentsDir,
        });
        expect(
            diagnostics.find((d) => d.kind === "MISSING_SOURCE_FILE")?.message
        ).toMatch(/ghost\.tsx/);
    });

    it("flags an orphan registry entry (no matching component dir)", {
        timeout: 5000,
    }, async () => {
        const componentsDir = join(workDir, "src/components");
        await writeFixture(
            "src/components/button/button.tsx",
            "export {}"
        );
        const entryButton = await writeJson("registry/r/button.json", {
            name: "@x/button",
            type: "registry:ui",
            files: [{ path: "button.tsx", type: "registry:ui" }],
        });
        const entryStale = await writeJson("registry/r/removed.json", {
            name: "@x/removed",
            type: "registry:ui",
            files: [{ path: "removed.tsx", type: "registry:ui" }],
        });
        const diagnostics = await audit({
            registryEntries: [entryButton, entryStale],
            componentDirs: ["button"],
            componentsDir,
        });
        expect(
            diagnostics.find(
                (d) => d.kind === "ORPHAN_REGISTRY_ENTRY"
            )?.message
        ).toMatch(/removed/);
    });

    it("flags an entry with empty files[]", { timeout: 5000 }, async () => {
        const componentsDir = join(workDir, "src/components");
        await writeFixture("src/components/foo/foo.tsx", "export {}");
        const entry = await writeJson("registry/r/foo.json", {
            name: "@x/foo",
            type: "registry:ui",
            files: [],
        });
        const diagnostics = await audit({
            registryEntries: [entry],
            componentDirs: ["foo"],
            componentsDir,
        });
        expect(
            diagnostics.find((d) => d.kind === "EMPTY_FILES_LIST")?.message
        ).toMatch(/foo\.json/);
    });

    it("flags malformed JSON entries", { timeout: 5000 }, async () => {
        const componentsDir = join(workDir, "src/components");
        await writeFixture("src/components/foo/foo.tsx", "");
        const entry = await writeFixture(
            "registry/r/foo.json",
            "{ not json"
        );
        const diagnostics = await audit({
            registryEntries: [entry],
            componentDirs: ["foo"],
            componentsDir,
        });
        expect(
            diagnostics.find((d) => d.kind === "MALFORMED_ENTRY")?.message
        ).toMatch(/foo\.json/);
    });
});