import { getIsPrettierAvailable, runPrettier } from "../tools/runPrettier";
import * as fsPr from "fs/promises";
import { join as pathJoin, sep as pathSep } from "path";
import { assert } from "tsafe/assert";
import type { BuildContext } from "../shared/buildContext";
import { KEYCLOAK_THEME } from "../shared/constants";

export type BuildContextLike = {
    themeSrcDirPath: string;
};

assert<BuildContext extends BuildContextLike ? true : false>();

export async function getUiModuleFileSourceCodeReadyToBeCopied(params: {
    buildContext: BuildContextLike;
    fileRelativePath: string;
    isForEjection: boolean;
    uiModuleDirPath: string;
    uiModuleName: string;
    uiModuleVersion: string;
}): Promise<Buffer> {
    const {
        buildContext,
        uiModuleDirPath,
        fileRelativePath,
        isForEjection,
        uiModuleName,
        uiModuleVersion
    } = params;

    let sourceCode = (
        await fsPr.readFile(pathJoin(uiModuleDirPath, KEYCLOAK_THEME, fileRelativePath))
    ).toString("utf8");

    const toComment = (lines: string[]) => {
        for (const ext of [".ts", ".tsx", ".css", ".less", ".sass", ".js", ".jsx"]) {
            if (!fileRelativePath.endsWith(ext)) {
                continue;
            }

            return [`/**`, ...lines.map(line => ` * ${line}`), ` */`].join("\n");
        }

        if (fileRelativePath.endsWith(".html")) {
            return [`<!--`, ...lines.map(line => ` ${line}`), `-->`].join("\n");
        }

        return undefined;
    };

    const comment = toComment(
        isForEjection
            ? [`This file was ejected from ${uiModuleName} version ${uiModuleVersion}.`]
            : [
                  `WARNING: Before modifying this file run the following command:`,
                  ``,
                  `$ npx keycloakify eject-file --file ${fileRelativePath.split(pathSep).join("/")}`,
                  ``,
                  `This file comes from ${uiModuleName} version ${uiModuleVersion}.`
              ]
    );

    if (comment !== undefined) {
        sourceCode = [comment, ``, sourceCode].join("\n");
    }

    const destFilePath = pathJoin(buildContext.themeSrcDirPath, fileRelativePath);

    format: {
        if (!(await getIsPrettierAvailable())) {
            break format;
        }

        sourceCode = await runPrettier({
            filePath: destFilePath,
            sourceCode
        });
    }

    return Buffer.from(sourceCode, "utf8");
}