import fs from "fs";
import toml from "toml";
import { exitWithError } from "./process.js";
import { Response } from "express";
import { markdownToSanitizedHTML } from "../util/markdown.js";
import i18next from "i18next";

interface StaticPage {
    title: string;
    path: string;
    filename: string;
}

export interface GathioConfig {
    general: {
        domain: string;
        port: string;
        email: string;
        site_name: string;
        delete_after_days: number;
        is_federated: boolean;
        email_logo_url: string;
        show_kofi: boolean;
        show_public_event_list: boolean;
        mail_service: "nodemailer" | "sendgrid" | "mailgun" | "none";
        creator_email_addresses: string[];
    };
    database: {
        mongodb_url: string;
    };
    nodemailer?: {
        smtp_url?: string;
        smtp_server: string;
        smtp_port: string;
        smtp_username: string;
        smtp_password: string;
    };
    sendgrid?: {
        api_key: string;
    };
    mailgun?: {
        api_key: string;
        api_url: string;
        domain: string;
    };
    static_pages?: StaticPage[];
}

interface FrontendConfig {
    domain: string;
    siteName: string;
    isFederated: boolean;
    emailLogoUrl: string;
    showKofi: boolean;
    showPublicEventList: boolean;
    showInstanceInformation: boolean;
    staticPages?: StaticPage[];
    version: string;
}

const defaultConfig: GathioConfig = {
    general: {
        domain: "localhost:3000",
        email: "contact@example.com",
        port: "3000",
        site_name: "gathio",
        is_federated: true,
        delete_after_days: 7,
        email_logo_url: "",
        show_public_event_list: false,
        show_kofi: false,
        mail_service: "none",
        creator_email_addresses: [],
    },
    database: {
        mongodb_url: "mongodb://localhost:27017/gathio",
    },
};

export const frontendConfig = (res: Response): FrontendConfig => {
    const config = res.locals.config;
    if (!config) {
        return {
            domain: defaultConfig.general.domain,
            siteName: defaultConfig.general.site_name,
            isFederated: defaultConfig.general.is_federated,
            emailLogoUrl: defaultConfig.general.email_logo_url,
            showPublicEventList: defaultConfig.general.show_public_event_list,
            showKofi: defaultConfig.general.show_kofi,
            showInstanceInformation: false,
            staticPages: [],
            version: process.env.npm_package_version || "unknown",
        };
    }
    return {
        domain: config.general.domain,
        siteName: config.general.site_name,
        isFederated: !!config.general.is_federated,
        emailLogoUrl: config.general.email_logo_url,
        showPublicEventList: !!config.general.show_public_event_list,
        showKofi: !!config.general.show_kofi,
        showInstanceInformation: !!config.static_pages?.length,
        staticPages: config.static_pages,
        version: process.env.npm_package_version || "unknown",
    };
};

interface InstanceRule {
    icon: string;
    text: string;
}

export const instanceRules = (): InstanceRule[] => {
    const config = getConfig();
    const rules = [];
    rules.push(
        config.general.show_public_event_list
            ? {
                text: i18next.t("config.instancerule.showpubliceventlist-true"),
                icon: "fas fa-eye",
            }
            : {
                text: i18next.t("config.instancerule.showpubliceventlist-false"),
                icon: "fas fa-eye-slash",
            },
    );
    rules.push(
        config.general.creator_email_addresses?.length
            ? {
                text: i18next.t("config.instancerule.creatoremail-true"),
                icon: "fas fa-user-check",
            }
            : {
                text: i18next.t("config.instancerule.creatoremail-false"),
                icon: "fas fa-users",
            },
    );
    rules.push(
        config.general.delete_after_days > 0
            ? {
                text: i18next.t("config.instancerule.deleteafterdays-true", { days: config.general.delete_after_days } ),
                icon: "far fa-calendar-times",
            }
            : {
                text: i18next.t("config.instancerule.deleteafterdays-false"),
                icon: "far fa-calendar-check",
            },
    );
    rules.push(
        config.general.is_federated
            ? {
                text: i18next.t("config.instancerule.isfederated-true"),
                icon: "fas fa-globe",
            }
            : {
                text: i18next.t("config.instancerule.isfederated-false"),
                icon: "fas fa-globe",
            },
    );
    return rules;
};

export const instanceDescription = (): string => {
    const config = getConfig();
    const defaultInstanceDescription = markdownToSanitizedHTML(
        i18next.t("config.defaultinstancedesc", "Welcome to this Gathio instance!")
    );
    let instanceDescription = defaultInstanceDescription;
    let instancedescfile = "./static/instance-description-" + i18next.language + ".md";
    try {
        if (fs.existsSync(instancedescfile)) {
            const fileBody = fs.readFileSync(
                instancedescfile,
                "utf-8",
            );
            instanceDescription = markdownToSanitizedHTML(fileBody);
        }
        // Replace {{siteName}} with the instance name
        instanceDescription = instanceDescription.replace(
            /\{\{ ?siteName ?\}\}/g,
            config?.general.site_name,
        );
        return instanceDescription;
    } catch (err) {
        console.log(err);
        return defaultInstanceDescription;
    }
};

let _resolvedConfig: GathioConfig | null = null;
// Attempt to load our global config. Will stop the app if the config file
// cannot be read (there's no point trying to continue!)
export const getConfig = (): GathioConfig => {
    if (_resolvedConfig) {
        return _resolvedConfig;
    }

    try {
        const config = toml.parse(
            fs.readFileSync("./config/config.toml", "utf-8"),
        ) as GathioConfig;
        const resolvedConfig = {
            ...defaultConfig,
            ...config,
        }
        if (process.env.CYPRESS || process.env.CI) {
            config.general.mail_service = "none";
            console.log(
                "Running in Cypress or CI, not initializing email service.",
            );
        } else if (config.general.mail_service === "none") {
            console.warn(
                "You have not configured this Gathio instance to send emails! This means that event creators will not receive emails when their events are created, which means they may end up locked out of editing events. Consider setting up an email service.",
            );
        }

        _resolvedConfig = resolvedConfig;
        return resolvedConfig;
    } catch {
        exitWithError(
            "Configuration file not found! Have you renamed './config/config-example.toml' to './config/config.toml'?",
        );
        return process.exit(1);
    }
};

export default getConfig;