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, loginThemePageIds, accountThemePageIds, themeTypes, type ThemeType } from "./generateFtl";
import { downloadBuiltinKeycloakTheme } from "../download-builtin-keycloak-theme";
import { mockTestingResourcesCommonPath, mockTestingResourcesPath, mockTestingSubDirOfPublicDirBasename } from "../mockTestingResourcesPath";
import { isInside } from "../tools/isInside";
import type { BuildOptions } from "./BuildOptions";
import { assert } from "tsafe/assert";

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

export namespace BuildOptionsLike {
    export type Common = {
        themeName: string;
        extraLoginPages?: string[];
        extraAccountPages?: string[];
        extraThemeProperties?: string[];
        isSilent: boolean;
        customUserAttributes: 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 & {
            areAppAndKeycloakServerSharingSameDomain: true;
        };

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

assert<BuildOptions extends BuildOptionsLike ? true : false>();

export async function generateKeycloakThemeResources(params: {
    reactAppBuildDirPath: string;
    keycloakThemeBuildingDirPath: string;
    emailThemeSrcDirPath: string | undefined;
    keycloakVersion: string;
    buildOptions: BuildOptionsLike;
    keycloakifyVersion: string;
}): Promise<{ doBundlesEmailTemplate: boolean }> {
    const { reactAppBuildDirPath, keycloakThemeBuildingDirPath, emailThemeSrcDirPath, keycloakVersion, buildOptions, keycloakifyVersion } = params;

    const getThemeDirPath = (themeType: ThemeType | "email") =>
        pathJoin(keycloakThemeBuildingDirPath, "src", "main", "resources", "theme", buildOptions.themeName, themeType);

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

    let generateFtlFilesCode_glob: ReturnType<typeof generateFtlFilesCodeFactory>["generateFtlFilesCode"] | undefined = undefined;

    for (const themeType of themeTypes) {
        const themeDirPath = getThemeDirPath(themeType);

        copy_app_resources_to_theme_path: {
            const isFirstPass = themeType.indexOf(themeType) === 0;

            if (!isFirstPass && !buildOptions.isStandalone) {
                break copy_app_resources_to_theme_path;
            }

            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")
                        });

                        register_css_variables: {
                            if (!isFirstPass) {
                                break register_css_variables;
                            }

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

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

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

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

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

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

        const generateFtlFilesCode = (() => {
            if (generateFtlFilesCode_glob !== undefined) {
                return generateFtlFilesCode_glob;
            }

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

            return generateFtlFilesCode;
        })();

        [
            ...(() => {
                switch (themeType) {
                    case "login":
                        return loginThemePageIds;
                    case "account":
                        return accountThemePageIds;
                }
            })(),
            ...((() => {
                switch (themeType) {
                    case "login":
                        return buildOptions.extraLoginPages;
                    case "account":
                        return buildOptions.extraAccountPages;
                }
            })() ?? [])
        ].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");

            await downloadBuiltinKeycloakTheme({
                keycloakVersion,
                "destDirPath": tmpDirPath,
                isSilent: buildOptions.isSilent
            });

            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"));
            fs.rmSync(tmpDirPath, { recursive: true, force: true });
        }

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

    let doBundlesEmailTemplate: boolean;

    email: {
        if (emailThemeSrcDirPath === undefined) {
            doBundlesEmailTemplate = false;
            break email;
        }

        doBundlesEmailTemplate = true;

        transformCodebase({
            "srcDirPath": emailThemeSrcDirPath,
            "destDirPath": getThemeDirPath("email")
        });
    }

    return { doBundlesEmailTemplate };
}