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

const rootDir = path.resolve(__dirname, "..");
const servicesDir = path.join(rootDir, "actions", "services");

const createAxiosMock = () => {
    const axios = (config) => axios.request(config);

    axios.calls = [];
    axios.requestHandler = async () => {
        throw new Error("No axios.request handler configured");
    };
    axios.getHandler = async () => {
        throw new Error("No axios.get handler configured");
    };
    axios.postHandler = async () => {
        throw new Error("No axios.post handler configured");
    };

    axios.request = (config) => {
        axios.calls.push({ type: "request", config });
        return axios.requestHandler(config);
    };

    axios.get = (url, config) => {
        axios.calls.push({ type: "get", url, config });
        return axios.getHandler(url, config);
    };

    axios.post = (url, data, config) => {
        axios.calls.push({ type: "post", url, data, config });
        return axios.postHandler(url, data, config);
    };

    return axios;
};

const createLoggerMock = () => {
    const calls = [];
    const consoleLogger = (error) => {
        calls.push(error);
    };
    return { consoleLogger, calls };
};

const createAxiosError = (status = 500, statusText = "Server Error") => {
    return {
        response: {
            status,
            statusText,
            data: {}
        },
        config: {
            url: "/mock-url"
        }
    };
};

const loadServiceModule = (fileName, injected = {}) => {
    const filePath = path.join(servicesDir, fileName);
    let source = fs.readFileSync(filePath, "utf8");

    source = source.replace(/import[\s\S]*?from\s+"[^"]+";\n?/g, "");

    const exportNames = Array.from(
        source.matchAll(/export const\s+(\w+)\s*=/g)
    ).map((match) => match[1]);

    source = source.replace(/export const\s+/g, "const ");
    source += `\nmodule.exports = { ${exportNames.join(", ")} };\n`;

    const defaultGetJson = (url, config) => {
        if (!injected.axios || !injected.axios.get) {
            throw new Error("Missing axios.get for default getJson mock");
        }

        return injected.axios
            .get(url, config)
            .then((response) => response.data);
    };

    const defaultRequestJson = (config) => {
        if (!injected.axios) {
            throw new Error("Missing axios for default requestJson mock");
        }

        return injected.axios(config).then((response) => response.data);
    };

    const defaultGetFileJson = (url) => {
        return defaultGetJson(url);
    };

    const defaultBuildHashedQueryUrl = async (queryUrl) => {
        if (!injected.axios || !injected.axios.get) {
            throw new Error(
                "Missing axios.get for default buildHashedQueryUrl mock"
            );
        }

        const hashResponse = await injected.axios.get(
            "/api/endpoint/gethash_api?path=" + encodeURIComponent(queryUrl)
        );

        return queryUrl + hashResponse.data.hash;
    };

    const defaultGetSignedFileJson = async (queryUrl) => {
        const hashedUrl = await (
            injected.buildHashedQueryUrl || defaultBuildHashedQueryUrl
        )(queryUrl);

        return (injected.requestJson || defaultRequestJson)({
            method: "get",
            url: hashedUrl
        });
    };

    const defaultDownloadFileBlob = (url) => {
        return (injected.requestJson || defaultRequestJson)({
            method: "get",
            url,
            responseType: "blob"
        });
    };

    const defaultDeleteSignedJson = async (queryUrl, config = {}) => {
        const hashedUrl = await (
            injected.buildHashedQueryUrl || defaultBuildHashedQueryUrl
        )(queryUrl);

        return (injected.requestJson || defaultRequestJson)({
            method: "delete",
            url: hashedUrl,
            ...config
        });
    };

    const defaultBuildFileQuery = (pathValue, params = {}, options = {}) => {
        const { encode = false } = options;
        const entries = Object.entries(params).filter(([, value]) => {
            return value !== undefined && value !== null;
        });

        if (entries.length === 0) {
            return pathValue;
        }

        const query = entries
            .map(([key, value]) => {
                if (!encode) {
                    return `${key}=${String(value)}`;
                }

                return `${encodeURIComponent(key)}=${encodeURIComponent(String(value))}`;
            })
            .join("&");

        return `${pathValue}?${query}`;
    };

    const defaultWithBaseUrl = (baseUrl, route) => `${baseUrl}${route}`;
    const defaultAppendQuerySuffix = (route, suffix = "") =>
        `${route}${suffix}`;

    const context = {
        module: { exports: {} },
        exports: {},
        require,
        URLSearchParams,
        encodeURIComponent,
        FormData: global.FormData,
        console: {
            log: () => {},
            info: () => {},
            warn: () => {},
            error: () => {}
        },
        getJson: injected.getJson || defaultGetJson,
        requestJson: injected.requestJson || defaultRequestJson,
        getFileJson: injected.getFileJson || defaultGetFileJson,
        getSignedFileJson:
            injected.getSignedFileJson || defaultGetSignedFileJson,
        downloadFileBlob: injected.downloadFileBlob || defaultDownloadFileBlob,
        deleteSignedJson: injected.deleteSignedJson || defaultDeleteSignedJson,
        buildHashedQueryUrl:
            injected.buildHashedQueryUrl || defaultBuildHashedQueryUrl,
        buildFileQuery: injected.buildFileQuery || defaultBuildFileQuery,
        withBaseUrl: injected.withBaseUrl || defaultWithBaseUrl,
        appendQuerySuffix:
            injected.appendQuerySuffix || defaultAppendQuerySuffix,
        ...injected
    };

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

const normalize = (value) => {
    if (value === undefined || value === null) {
        return value;
    }

    return JSON.parse(JSON.stringify(value));
};

module.exports = {
    createAxiosMock,
    createLoggerMock,
    createAxiosError,
    loadServiceModule,
    normalize
};