import { copyFile, readFile } from "fs/promises";
import * as handlebars from 'handlebars';
import { join } from 'path';
import { Project } from "ts-morph";
import { Logger } from 'winston';
import { analyzeFiles } from "./analyzeTypescriptFiles";
import { createFile, createPath } from "./fileHelpers";

/**
 * Generate the Client Templates.
 * @param options 
 */
export async function generateClientTemplate(options: {
    pathToTemplate: string,
    outputDir: string,
    inputDir: string,
    tsConfigFilePath: string,
    // A Logger.
    logger?: Logger
}) {

    // Create the Output dir (if it doenst exists)
    await createPath(options.outputDir);

    if (options.logger) {
        options.logger.info('Templates will be stored in ' + options.outputDir);
    }

    // Firstly copy the nopeDispatcher
    await copyFile(
        join(__dirname, '..', '..', '..', 'lib', 'dispatcher', 'nopeDispatcher.ts'),
        join(options.outputDir, 'nopeDispatcher.ts')
    );

    // Function to Determine new project files.
    const project = new Project({
        tsConfigFilePath: options.tsConfigFilePath,
        addFilesFromTsConfig: false,
    });

    project.addSourceFilesAtPaths(options.inputDir);

    // Readin the Source-Files.
    const sourceFiles = project.getSourceFiles();

    // Generate the Files
    const result = analyzeFiles(sourceFiles);

    // load the File.
    const template = await readFile(options.pathToTemplate, {
        encoding: 'utf-8'
    })

    // Renderfuncting
    const render = handlebars.compile(template);

    // Generate the Files.
    const files: {
        name: string,
        content: string,
    }[] = result.map(item => {

        item.className = item.className + 'ClientInterface'

        return {
            name: item.className + '.ts',
            content: render(item)
        }
    });

    for (const file of files) {
        // Define the File Name:
        const fileName = join(options.outputDir, 'clients', file.name);

        await createFile(
            // Generate the Path.
            join(options.outputDir, 'clients', file.name),
            file.content
        );

        if (options.logger) {
            options.logger.info('Generated -> ' + fileName);
        }

        // Function to Determine new project files.
        const project = new Project({
            tsConfigFilePath: options.tsConfigFilePath,
            addFilesFromTsConfig: false,
        });

        project.addSourceFileAtPath(fileName);

        // Readin the Source-Files.
        const sourceFiles = project.getSourceFiles();

        for (const file of sourceFiles) {
            file.formatText();
            await file.save();
        }
    }

    // Compile the Template and parse the Code.
    return true;
}