// @ts-check

/**
 * ==============================================================================
 * Imports
 * ==============================================================================
 */
const http = require("http");
const https = require("https");
const fs = require("fs");
const path = require("path");
const encrypt = require("../package-shared/functions/dsql/encrypt");
const grabHostNames = require("../package-shared/utils/grab-host-names");
const apiLoginUser = require("../package-shared/functions/api/users/api-login");
const getAuthCookieNames = require("../package-shared/functions/backend/cookies/get-auth-cookie-names");
const {
    writeAuthFile,
} = require("../package-shared/functions/backend/auth/write-auth-files");

/**
 * Login A user
 * ==============================================================================
 * @async
 *
 * @param {object} params - Single Param object containing params
 * @param {String} [params.key] - FULL ACCESS API Key
 * @param {String} params.database - Target Database
 * @param {{
 *  email?: string,
 *  username?: string,
 *  password?: string,
 * }} params.payload Login Email/Username and Password
 * @param {string[]} [params.additionalFields] - Additional Fields to be added to the user object
 * @param {http.ServerResponse & Object<string, any>} [params.response] - Http response object
 * @param {String} [params.encryptionKey] - Encryption Key
 * @param {String} [params.encryptionSalt] - Encryption Salt
 * @param {boolean} [params.email_login] - Email only Login
 * @param {string} [params.email_login_code] - Email login code
 * @param {string} [params.temp_code_field] - Database table field name for temporary code
 * @param {boolean} [params.token] - Send access key as part of response body?
 * @param {string | number} [params.user_id] - User ID
 * @param {boolean} [params.skipPassword]
 * @param {boolean} [params.useLocal]
 * @param {string | number} [params.apiUserID] - Required for setting of cookies
 *
 * @returns { Promise<import("../package-shared/types").APILoginFunctionReturn>}
 */
async function loginUser({
    key,
    payload,
    database,
    additionalFields,
    response,
    encryptionKey,
    encryptionSalt,
    email_login,
    email_login_code,
    temp_code_field,
    token,
    user_id,
    skipPassword,
    useLocal,
    apiUserID,
}) {
    const grabedHostNames = grabHostNames();
    const { host, port, scheme } = grabedHostNames;

    const defaultTempLoginFieldName = "temp_login_code";
    const emailLoginTempCodeFieldName = email_login
        ? temp_code_field
            ? temp_code_field
            : defaultTempLoginFieldName
        : undefined;

    const finalEncryptionKey =
        encryptionKey || process.env.DSQL_ENCRYPTION_PASSWORD;
    const finalEncryptionSalt =
        encryptionSalt || process.env.DSQL_ENCRYPTION_SALT;

    if (!finalEncryptionKey?.match(/.{8,}/)) {
        console.log("Encryption key is invalid");
        return {
            success: false,
            payload: null,
            msg: "Encryption key is invalid",
        };
    }
    if (!finalEncryptionSalt?.match(/.{8,}/)) {
        console.log("Encryption salt is invalid");
        return {
            success: false,
            payload: null,
            msg: "Encryption salt is invalid",
        };
    }

    /**
     * Check required fields
     *
     * @description Check required fields
     */
    if (!payload.email) {
        return {
            success: false,
            payload: null,
            msg: "Email Required",
        };
    }

    /**
     * Initialize HTTP response variable
     */

    /** @type {import("../package-shared/types").APILoginFunctionReturn} */
    let httpResponse = {
        success: false,
    };

    /**
     * Check for local DB settings
     *
     * @description Look for local db settings in `.env` file and by pass the http request if available
     */
    const { DSQL_DB_HOST, DSQL_DB_USERNAME, DSQL_DB_PASSWORD, DSQL_DB_NAME } =
        process.env;

    if (
        DSQL_DB_HOST?.match(/./) &&
        DSQL_DB_USERNAME?.match(/./) &&
        DSQL_DB_PASSWORD?.match(/./) &&
        DSQL_DB_NAME?.match(/./) &&
        useLocal
    ) {
        /** @type {import("../package-shared/types").DSQL_DatabaseSchemaType | undefined} */
        let dbSchema;

        try {
            const localDbSchemaPath = path.resolve(
                process.cwd(),
                "dsql.schema.json"
            );
            dbSchema = JSON.parse(fs.readFileSync(localDbSchemaPath, "utf8"));
        } catch (error) {}

        httpResponse = await apiLoginUser({
            database: process.env.DSQL_DB_NAME || "",
            email: payload.email,
            username: payload.username,
            password: payload.password,
            skipPassword,
            encryptionKey: finalEncryptionKey,
            additionalFields,
            email_login,
            email_login_code,
            email_login_field: emailLoginTempCodeFieldName,
            token,
            useLocal,
        });
    } else {
        /**
         * Make https request
         *
         * @description make a request to datasquirel.com
         *
         * @type {{ success: boolean, payload: import("../package-shared/types").DATASQUIREL_LoggedInUser | null, userId?: number, msg?: string }}
         */
        httpResponse = await new Promise((resolve, reject) => {
            /** @type {import("../package-shared/types").PackageUserLoginRequestBody} */
            const reqPayload = {
                encryptionKey: finalEncryptionKey,
                payload,
                database,
                additionalFields,
                email_login,
                email_login_code,
                email_login_field: emailLoginTempCodeFieldName,
                token,
                skipPassword: skipPassword,
            };

            const reqPayloadJSON = JSON.stringify(reqPayload);

            const httpsRequest = scheme.request(
                {
                    method: "POST",
                    headers: {
                        "Content-Type": "application/json",
                        "Content-Length": Buffer.from(reqPayloadJSON).length,
                        Authorization:
                            key ||
                            process.env.DSQL_FULL_ACCESS_API_KEY ||
                            process.env.DSQL_API_KEY,
                    },
                    port,
                    hostname: host,
                    path: `/api/user/${
                        user_id || grabedHostNames.user_id
                    }/login-user`,
                },

                /**
                 * Callback Function
                 *
                 * @description https request callback
                 */
                (res) => {
                    var str = "";

                    res.on("data", function (chunk) {
                        str += chunk;
                    });

                    res.on("end", function () {
                        resolve(JSON.parse(str));
                    });

                    res.on("error", (err) => {
                        reject(err);
                    });
                }
            );

            httpsRequest.write(reqPayloadJSON);
            httpsRequest.end();
        });
    }

    /**
     * Make https request
     *
     * @description make a request to datasquirel.com
     */
    if (httpResponse?.success) {
        let encryptedPayload = encrypt({
            data: JSON.stringify(httpResponse.payload),
            encryptionKey: finalEncryptionKey,
            encryptionSalt: finalEncryptionSalt,
        });

        try {
            if (token && encryptedPayload)
                httpResponse["token"] = encryptedPayload;
        } catch (error) {}

        const cookieNames = getAuthCookieNames({
            database,
            userId: apiUserID || user_id || grabedHostNames.user_id,
        });

        if (httpResponse.csrf) {
            writeAuthFile(
                httpResponse.csrf,
                JSON.stringify(httpResponse.payload)
            );
        }

        httpResponse["cookieNames"] = cookieNames;
        httpResponse["key"] = String(encryptedPayload);

        const authKeyName = cookieNames.keyCookieName;
        const csrfName = cookieNames.csrfCookieName;

        response?.setHeader("Set-Cookie", [
            `${authKeyName}=${encryptedPayload};samesite=strict;path=/;HttpOnly=true;Secure=true`,
            `${csrfName}=${httpResponse.payload?.csrf_k};samesite=strict;path=/;HttpOnly=true`,
        ]);
    }

    return httpResponse;
}

module.exports = loginUser;