import { transformCodebase } from "../tools/transformCodebase";
import * as fs from "fs";
import { join as pathJoin, basename as pathBasename } from "path";
import { replaceImportsFromStaticInJsCode } from "./replacers/replaceImportsFromStaticInJsCode";
import { replaceImportsInCssCode } from "./replacers/replaceImportsInCssCode";
import { generateFtlFilesCodeFactory, pageIds } from "./generateFtl";
import { downloadBuiltinKeycloakTheme } from "../download-builtin-keycloak-theme";
import * as child_process from "child_process";
import { mockTestingResourcesCommonPath, mockTestingResourcesPath, mockTestingSubDirOfPublicDirBasename } from "../mockTestingResourcesPath";
import { isInside } from "../tools/isInside";
import type { BuildOptions } from "./BuildOptions";
import { assert } from "tsafe/assert";
import { Reflect } from "tsafe/Reflect";

export type BuildOptionsLike = BuildOptionsLike.Standalone | BuildOptionsLike.ExternalAssets;

export namespace BuildOptionsLike {
    export type Common = {
        themeName: string;
        extraPages?: string[];
        extraThemeProperties?: string[];
    };

    export type Standalone = Common & {
        isStandalone: true;
        urlPathname: string | undefined;
    };

    export type ExternalAssets = ExternalAssets.SameDomain | ExternalAssets.DifferentDomains;

    export namespace ExternalAssets {
        export type CommonExternalAssets = Common & {
            isStandalone: false;
        };

        export type SameDomain = CommonExternalAssets & {
            isAppAndKeycloakServerSharingSameDomain: true;
        };

        export type DifferentDomains = CommonExternalAssets & {
            isAppAndKeycloakServerSharingSameDomain: false;
            urlOrigin: string;
            urlPathname: string | undefined;
        };
    }
}

{
    const buildOptions = Reflect<BuildOptions>();

    assert<typeof buildOptions extends BuildOptionsLike ? true : false>();
}

export function generateKeycloakThemeResources(params: {
    reactAppBuildDirPath: string;
    keycloakThemeBuildingDirPath: string;
    keycloakThemeEmailDirPath: string;
    keycloakVersion: string;
    buildOptions: BuildOptionsLike;
}): { doBundlesEmailTemplate: boolean } {
    const { reactAppBuildDirPath, keycloakThemeBuildingDirPath, keycloakThemeEmailDirPath, keycloakVersion, buildOptions } = params;

    const themeDirPath = pathJoin(keycloakThemeBuildingDirPath, "src", "main", "resources", "theme", buildOptions.themeName, "login");

    let allCssGlobalsToDefine: Record<string, string> = {};

    transformCodebase({
        "destDirPath": buildOptions.isStandalone ? pathJoin(themeDirPath, "resources", "build") : reactAppBuildDirPath,
        "srcDirPath": reactAppBuildDirPath,
        "transformSourceCode": ({ filePath, sourceCode }) => {
            //NOTE: Prevent cycles, excludes the folder we generated for debug in public/
            if (
                buildOptions.isStandalone &&
                isInside({
                    "dirPath": pathJoin(reactAppBuildDirPath, mockTestingSubDirOfPublicDirBasename),
                    filePath,
                })
            ) {
                return undefined;
            }

            if (/\.css?$/i.test(filePath)) {
                if (!buildOptions.isStandalone) {
                    return undefined;
                }

                const { cssGlobalsToDefine, fixedCssCode } = replaceImportsInCssCode({
                    "cssCode": sourceCode.toString("utf8"),
                });

                allCssGlobalsToDefine = {
                    ...allCssGlobalsToDefine,
                    ...cssGlobalsToDefine,
                };

                return { "modifiedSourceCode": Buffer.from(fixedCssCode, "utf8") };
            }

            if (/\.js?$/i.test(filePath)) {
                if (!buildOptions.isStandalone && buildOptions.isAppAndKeycloakServerSharingSameDomain) {
                    return undefined;
                }

                const { fixedJsCode } = replaceImportsFromStaticInJsCode({
                    "jsCode": sourceCode.toString("utf8"),
                    buildOptions,
                });

                return { "modifiedSourceCode": Buffer.from(fixedJsCode, "utf8") };
            }

            return buildOptions.isStandalone ? { "modifiedSourceCode": sourceCode } : undefined;
        },
    });

    let doBundlesEmailTemplate: boolean;

    email: {
        if (!fs.existsSync(keycloakThemeEmailDirPath)) {
            console.log(
                [
                    `Not bundling email template because ${pathBasename(keycloakThemeEmailDirPath)} does not exist`,
                    `To start customizing the email template, run: 👉 npx create-keycloak-email-directory 👈`,
                ].join("\n"),
            );
            doBundlesEmailTemplate = false;
            break email;
        }

        doBundlesEmailTemplate = true;

        transformCodebase({
            "srcDirPath": keycloakThemeEmailDirPath,
            "destDirPath": pathJoin(themeDirPath, "..", "email"),
        });
    }

    const { generateFtlFilesCode } = generateFtlFilesCodeFactory({
        "indexHtmlCode": fs.readFileSync(pathJoin(reactAppBuildDirPath, "index.html")).toString("utf8"),
        "cssGlobalsToDefine": allCssGlobalsToDefine,
        "buildOptions": buildOptions,
    });

    [...pageIds, ...(buildOptions.extraPages ?? [])].forEach(pageId => {
        const { ftlCode } = generateFtlFilesCode({ pageId });

        fs.mkdirSync(themeDirPath, { "recursive": true });

        fs.writeFileSync(pathJoin(themeDirPath, pageId), Buffer.from(ftlCode, "utf8"));
    });

    {
        const tmpDirPath = pathJoin(themeDirPath, "..", "tmp_xxKdLpdIdLd");

        downloadBuiltinKeycloakTheme({
            keycloakVersion,
            "destDirPath": tmpDirPath,
        });

        const themeResourcesDirPath = pathJoin(themeDirPath, "resources");

        transformCodebase({
            "srcDirPath": pathJoin(tmpDirPath, "keycloak", "login", "resources"),
            "destDirPath": themeResourcesDirPath,
        });

        const reactAppPublicDirPath = pathJoin(reactAppBuildDirPath, "..", "public");

        transformCodebase({
            "srcDirPath": pathJoin(tmpDirPath, "keycloak", "common", "resources"),
            "destDirPath": pathJoin(themeResourcesDirPath, pathBasename(mockTestingResourcesCommonPath)),
        });

        transformCodebase({
            "srcDirPath": themeResourcesDirPath,
            "destDirPath": pathJoin(reactAppPublicDirPath, mockTestingResourcesPath),
        });

        const keycloakResourcesWithinPublicDirPath = pathJoin(reactAppPublicDirPath, mockTestingSubDirOfPublicDirBasename);

        fs.writeFileSync(
            pathJoin(keycloakResourcesWithinPublicDirPath, "README.txt"),
            Buffer.from(
                ["This is just a test folder that helps develop", "the login and register page without having to run a Keycloak container"].join(" "),
            ),
        );

        fs.writeFileSync(pathJoin(keycloakResourcesWithinPublicDirPath, ".gitignore"), Buffer.from("*", "utf8"));

        child_process.execSync(`rm -r ${tmpDirPath}`);
    }

    fs.writeFileSync(
        pathJoin(themeDirPath, "theme.properties"),
        Buffer.from(["parent=keycloak", ...(buildOptions.extraThemeProperties ?? [])].join("\n\n"), "utf8"),
    );

    return { doBundlesEmailTemplate };
}