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;
        },
        post(fn) {
            this.handler = fn;
        }
    };

    return () => router;
};

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

    return {
        state,
        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("deletewatchedcases_api rejects missing watchedCaseID with 400", async () => {
    let axiosCalls = 0;
    const mod = loadModule("pages/api/endpoint/deletewatchedcases_api.js", {
        axios: async () => {
            axiosCalls += 1;
            return { data: {} };
        },
        getToken: async () => ({ access_token: "token" })
    });

    const req = { query: {} };
    const res = createRes();
    await mod.default(req, res);

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

test("getaccounts_api rejects missing emailAddress with 400", async () => {
    const mod = loadModule("pages/api/endpoint/getaccounts_api.js", {
        _: { isEmpty: () => true },
        axios: { get: async () => ({ data: { value: [] } }) },
        getToken: async () => ({ access_token: "token" }),
        hashAPIPath: () => "&hash=expected",
        azureHeaders: () => ({})
    });

    const req = { query: {} };
    const res = createRes();
    await mod.default(req, res);

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

test("getbasicsearchpaged_api rejects missing searchString with 400", async () => {
    const mod = loadModule("pages/api/endpoint/getbasicsearchpaged_api.js", {
        axios: { get: async () => ({ data: { value: [] } }) },
        getToken: async () => ({ access_token: "token" }),
        hashAPIPath: () => "&hash=expected",
        azureHeadersPagedCustom: () => ({})
    });

    const req = { query: { pageNumber: "1" } };
    const res = createRes();
    await mod.default(req, res);

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

test("getappealpdfdocuments_api rejects missing incidentid with 400", async () => {
    const mod = loadModule("pages/api/endpoint/getappealpdfdocuments_api.js", {
        axios: { get: async () => ({ data: { value: [] } }) },
        getToken: async () => ({ access_token: "token" }),
        hashAPIPath: () => "&hash=expected",
        azureHeaders: () => ({})
    });

    const req = { query: {} };
    const res = createRes();
    await mod.default(req, res);

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

test("createcase_api rejects missing required query params with 400", async () => {
    const blobCalls = [];
    const mod = loadModule("pages/api/file/createcase_api.js", {
        _: { isEmpty: () => true },
        getToken: async () => ({ access_token: "token" }),
        getTempCaseRef: () => "TMP-1",
        uuidv4: () => "uuid-1",
        getCaseBlob: (...args) => blobCalls.push(args),
        createBlob: (...args) => blobCalls.push(args)
    });

    const req = { query: {}, body: {} };
    const res = createRes();
    await mod.default(req, res);

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

test("updatecase_api rejects missing required inputs with 400", async () => {
    const mod = loadModule("pages/api/file/updatecase_api.js", {
        getToken: async () => ({ access_token: "token" }),
        axios: async () => ({ data: { ok: true } })
    });

    const req = {
        query: { incident: "inc-1", appealObj: "appeal-1" },
        body: { title: "x" }
    };
    const res = createRes();
    await mod.default(req, res);

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

test("deleteblob valid hash still returns 200", async () => {
    const mod = loadModule("pages/api/file/deleteblob.js", {
        hashAPIPath: () => "&hash=expected",
        deleteBlob: async () => true,
        nextConnect: createNextConnectMock(),
        middleware: () => {}
    });

    const req = {
        query: {
            container: "c1",
            casefolderID: "case-1",
            blobname: "f.pdf",
            hash: "expected"
        }
    };
    const res = createRes();
    await mod.default.handler(req, res);

    assert.strictEqual(res.state.statusCode, 200);
});

test("getprogressobjblob valid hash still returns 200", async () => {
    const mod = loadModule("pages/api/file/getprogressobjblob.js", {
        hashAPIPath: () => "&hash=expected",
        getProgressBlobs: async () => ({ path: "p1" }),
        downloadProgressFile: async () => ({ filesList: [] }),
        nextConnect: createNextConnectMock(),
        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)), {
        filesList: []
    });
});

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

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

    console.log(
        `Phase 18 behavioural tests passed (${passed}/${tests.length}).`
    );
};

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