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*\(/g,
        "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,
        CryptoJS: {
            HmacSHA256: () => ({ toString: () => "hashed" }),
            enc: { Hex: { parse: () => "" } }
        },
        console: {
            log: () => {},
            info: () => {},
            warn: () => {},
            error: () => {}
        },
        ...injected
    };

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

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("createwatchedcases_api rejects missing required @odata binds with 400", async () => {
    let axiosCalls = 0;
    const axiosMock = async () => {
        axiosCalls += 1;
        return { data: {} };
    };
    axiosMock.get = async () => ({ data: { value: [] } });

    const mod = loadModule("pages/api/endpoint/createwatchedcases_api.js", {
        axios: axiosMock,
        getToken: async () => ({ access_token: "token" })
    });

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

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

test("createwatchedcases_api rejects malformed @odata bind values with 400", async () => {
    let axiosCalls = 0;
    const axiosMock = async () => {
        axiosCalls += 1;
        return { data: {} };
    };
    axiosMock.get = async () => ({ data: { value: [] } });

    const mod = loadModule("pages/api/endpoint/createwatchedcases_api.js", {
        axios: axiosMock,
        getToken: async () => ({ access_token: "token" })
    });

    const req = {
        body: {
            "pinswg_WatchedCase@odata.bind": "/incidents/no-brackets",
            "pinswg_Contact@odata.bind": "/contacts/no-brackets"
        }
    };
    const res = createRes();
    await mod.default(req, res);

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

test("createwatchedcases_api valid body still returns 200", async () => {
    const axiosConfigCalls = [];
    const axiosMock = async (config) => {
        axiosConfigCalls.push(config);
        return { data: { ok: true } };
    };
    axiosMock.get = async () => ({ data: { value: [] } });

    const mod = loadModule("pages/api/endpoint/createwatchedcases_api.js", {
        axios: axiosMock,
        getToken: async () => ({ access_token: "token" })
    });

    const req = {
        body: {
            "pinswg_WatchedCase@odata.bind": "/incidents(inc-1)",
            "pinswg_Contact@odata.bind": "/contacts(con-1)"
        }
    };
    const res = createRes();
    await mod.default(req, res);

    assert.strictEqual(res.state.statusCode, 200);
    assert.strictEqual(axiosConfigCalls.length, 1);
});

test("getappealtypes_api still returns 200 on successful relay call", async () => {
    const mod = loadModule("pages/api/endpoint/getappealtypes_api.js", {
        axios: { get: async () => ({ data: { value: [{ id: 1 }] } }) },
        getToken: async () => ({ access_token: "token" }),
        azureHeaders: () => ({})
    });

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

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

test("getdnslist_api still returns 200 and preserves nextLink transform", async () => {
    const mod = loadModule("pages/api/endpoint/getdnslist_api.js", {
        axios: {
            get: async () => ({
                data: {
                    value: [{ id: 1 }],
                    "@odata.nextLink":
                        "https://example.test/v9.2/incidents?$skiptoken=abc"
                }
            })
        },
        getToken: async () => ({ access_token: "token" }),
        azureHeaders: () => ({}),
        _: { has: (obj, key) => Object.prototype.hasOwnProperty.call(obj, key) }
    });

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

    assert.strictEqual(res.state.statusCode, 200);
    assert.strictEqual(
        res.state.jsonBody["@odata.nextLink"],
        'incidents?$skiptoken=abc"'
    );
});

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

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

    console.log(
        `Phase 19 behavioural tests passed (${passed}/${tests.length}).`
    );
};

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