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

const rootDir = path.resolve(__dirname, "..", "..");

const loadModule = (relativePath, injected = {}) => {
    const filePath = path.join(rootDir, relativePath);
    let source = fs.readFileSync(filePath, "utf8");

    source = source.replace(/import[\s\S]*?from\s+"[^"]+";\n?/g, "");
    source = source.replace(
        /export default async function\s+(\w+)\s*\(/,
        "async function $1("
    );
    source = source.replace(/export const\s+/g, "const ");
    source = source.replace(
        /export default\s+(\w+);/g,
        "module.exports.default = $1;"
    );

    source +=
        '\nif (typeof ApiProxy !== "undefined" && !module.exports.default) module.exports.default = ApiProxy;\n';

    const context = {
        module: { exports: {} },
        exports: {},
        require,
        process,
        console: {
            log: () => {},
            info: () => {},
            warn: () => {},
            error: () => {}
        },
        ...injected
    };

    vm.runInNewContext(source, context, { filename: filePath });
    return context.module.exports;
};

const createNextConnectMock = () => {
    const router = {
        handler: null,
        use: () => {},
        get(fn) {
            this.handler = fn;
        }
    };

    return () => router;
};

const createRes = () => {
    const state = {
        statusCode: null,
        jsonBody: undefined
    };

    return {
        state,
        setHeader: () => {},
        status(code) {
            state.statusCode = code;
            return this;
        },
        json(payload) {
            state.jsonBody = payload;
            return payload;
        }
    };
};

const tests = [];
const test = (name, fn) => tests.push({ name, fn });

test("getawaitingsubmissionfromblob rejects missing hash with 400", async () => {
    const calls = [];
    const nextConnect = createNextConnectMock();

    const mod = loadModule("pages/api/file/getawaitingsubmissionfromblob.js", {
        hashAPIPath: () => "&hash=expected",
        getAllProgressBlobs: async (...args) => {
            calls.push(args);
            return [];
        },
        downloadAllProgressFiles: async () => [],
        _: { isEmpty: (value) => !value },
        nextConnect,
        middleware: () => {}
    });

    const req = { query: { container: "c1" } };
    const res = createRes();

    await mod.default.handler(req, res);

    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(calls.length, 0);
});

test("getprogressobjblob rejects missing casefolderID with 400", async () => {
    const calls = [];
    const nextConnect = createNextConnectMock();

    const mod = loadModule("pages/api/file/getprogressobjblob.js", {
        hashAPIPath: () => "&hash=expected",
        getProgressBlobs: async (...args) => {
            calls.push(args);
            return { path: "x" };
        },
        downloadProgressFile: async () => ({}),
        _: { isEmpty: (value) => !value },
        nextConnect,
        middleware: () => {}
    });

    const req = {
        query: { container: "c1", hash: "expected" }
    };
    const res = createRes();

    await mod.default.handler(req, res);

    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(calls.length, 0);
});

test("getbloblist rejects invalid hash with 400", async () => {
    const calls = [];
    const nextConnect = createNextConnectMock();

    const mod = loadModule("pages/api/file/getbloblist.js", {
        hashAPIPath: () => "&hash=expected",
        getBlobs: async (...args) => {
            calls.push(args);
            return [];
        },
        getRepsFilesBlobs: async () => [],
        nextConnect,
        middleware: () => {}
    });

    const req = {
        query: {
            container: "c1",
            casefolderID: "case-1",
            hash: "wrong"
        }
    };
    const res = createRes();

    await mod.default.handler(req, res);

    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(calls.length, 0);
});

test("getrepsblob rejects missing hash with 400", async () => {
    const calls = [];
    const nextConnect = createNextConnectMock();

    const mod = loadModule("pages/api/file/getrepsblob.js", {
        hashAPIPath: () => "&hash=expected",
        getRepsBlobs: async (...args) => {
            calls.push(args);
            return [];
        },
        downloadAllRepsFiles: async () => [],
        consoleLogger: () => {},
        _: { isEmpty: (value) => !value },
        nextConnect,
        middleware: () => {}
    });

    const req = {
        query: {
            container: "c1",
            casefolderID: "case-1"
        }
    };
    const res = createRes();

    await mod.default.handler(req, res);

    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(calls.length, 0);
});

test("getbloblist happy path with valid hash returns 200", async () => {
    const nextConnect = createNextConnectMock();

    const mod = loadModule("pages/api/file/getbloblist.js", {
        hashAPIPath: () => "&hash=expected",
        getBlobs: async () => ["file-1"],
        getRepsFilesBlobs: async () => ["file-rep"],
        nextConnect,
        middleware: () => {}
    });

    const req = {
        query: {
            container: "c1",
            casefolderID: "case-1",
            hash: "expected"
        }
    };
    const res = createRes();

    await mod.default.handler(req, res);

    assert.strictEqual(res.state.statusCode, 200);
    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
        value: [["file-1"]]
    });
});

const run = async () => {
    let passed = 0;

    for (const currentTest of tests) {
        await currentTest.fn();
        passed += 1;
    }

    console.log(
        `Phase 10 behavioural tests passed (${passed}/${tests.length}).`
    );
};

run().catch((error) => {
    console.error(error);
    process.exit(1);
});