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

    const mod = loadModule("pages/api/file/upload.js", {
        hashAPIPath: () => "?hash=expected",
        createBlob: async (...args) => {
            calls.push(args);
            return { ok: true };
        },
        createRepBlob: async (...args) => {
            calls.push(args);
            return { ok: true };
        },
        uploadFile: async () => {},
        nextConnect,
        middleware: () => {}
    });

    const req = {
        query: {},
        body: { appealData: {}, containerID: ["c1"], casefolderID: ["case-1"] },
        files: {}
    };
    const res = createRes();

    await mod.default.handler(req, res);
    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(calls.length, 0);
});

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

    const mod = loadModule("pages/api/file/uploadsinglefile.js", {
        hashAPIPath: () => "?hash=expected",
        uploadSingleFile: async (...args) => {
            uploadCalls.push(args);
            return { ok: true };
        },
        consoleLogger: () => {},
        fileTypeFromBuffer: async () => ({ mime: "application/pdf" }),
        fs: { readFileSync: () => Buffer.from("file") },
        path: { basename: (value) => value },
        nextConnect,
        middleware: () => {}
    });

    const req = {
        query: {},
        body: { containerID: ["c1"], casefolderID: ["case-1"] },
        files: {}
    };
    const res = createRes();

    await mod.default.handler(req, res);
    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(uploadCalls.length, 0);
});

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

    const mod = loadModule(
        "pages/api/file/createappealcompletemessage_api.js",
        {
            hashAPIPath: () => "&hash=expected",
            getProgressBlobs: async (...args) => {
                calls.push(args);
                return { path: "p1" };
            },
            downloadProgressFile: async () => ({}),
            createBlob: async () => ({}),
            getCaseBlob: async () => ({}),
            createCaseCompleteMessage: async () => ({}),
            updateAccount: async () => ({}),
            consoleLogger: () => {},
            _: { isEmpty: (value) => !value },
            nextConnect,
            middleware: () => {}
        }
    );

    const req = {
        query: { container: "c1", tempcaseref: "tmp-1", inv: 846040001 }
    };
    const res = createRes();

    await mod.default.handler(req, res);
    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(calls.length, 0);
});

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

    const mod = loadModule("pages/api/file/setupcontainer.js", {
        hashAPIPath: () => "&hash=expected",
        createContainer: async (...args) => {
            createCalls.push(args);
            return { ok: true };
        },
        createContainerSas: async () => {},
        getContainers: async () => {},
        getBlobs: async () => {},
        uploadFile: async () => {},
        consoleLogger: () => {},
        nextConnect,
        middleware: () => {}
    });

    const req = { query: { ident: "container-1" } };
    const res = createRes();

    await mod.default.handler(req, res);
    assert.strictEqual(res.state.statusCode, 400);
    assert.strictEqual(createCalls.length, 0);
});

test("setupcontainer valid hash returns 200 with expected response shape", async () => {
    const nextConnect = createNextConnectMock();

    const mod = loadModule("pages/api/file/setupcontainer.js", {
        hashAPIPath: () => "&hash=expected",
        createContainer: async () => ({ container: "container-1" }),
        createContainerSas: async () => {},
        getContainers: async () => {},
        getBlobs: async () => {},
        uploadFile: async () => {},
        consoleLogger: () => {},
        nextConnect,
        middleware: () => {}
    });

    const req = { query: { ident: "container-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)), {
        data: "success",
        output: { container: "container-1" }
    });
});

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

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

    console.log(
        `Phase 15 behavioural tests passed (${passed}/${tests.length}).`
    );
};

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