import * as fs from 'fs';
import * as path from 'path';

import { TInputCLIOptions } from '../../types/options/TInputCLIOptions';

import { StringSeparator } from '../../enums/StringSeparator';

import { JavaScriptObfuscatorCLI } from '../JavaScriptObfuscatorCLI';

export class ObfuscatedCodeFileUtils {
    /**
     * @type {string}
     */
    private readonly inputPath: string;

    /**
     * @type {TInputCLIOptions}
     */
    private readonly options: TInputCLIOptions;

    /**
     * @param {string} inputPath
     * @param {TInputCLIOptions} options
     */
    public constructor(inputPath: string, options: TInputCLIOptions) {
        this.inputPath = path.normalize(inputPath);
        this.options = options;
    }

    /**
     * @param {string} filePath
     * @returns {string}
     */
    public getOutputCodePath(filePath: string): string {
        const normalizedFilePath: string = path.normalize(filePath);
        const normalizedRawOutputPath: string | null = this.options.output ? path.normalize(this.options.output) : null;

        if (!normalizedRawOutputPath) {
            return normalizedFilePath
                .split(StringSeparator.Dot)
                .map((value: string, index: number) => {
                    return index === 0 ? `${value}${JavaScriptObfuscatorCLI.obfuscatedFilePrefix}` : value;
                })
                .join(StringSeparator.Dot);
        }

        const rawInputPathStats: fs.Stats = fs.lstatSync(this.inputPath);
        const outputPathExtName: string = path.extname(normalizedRawOutputPath);

        const isDirectoryRawInputPath: boolean = rawInputPathStats.isDirectory();
        const isDirectoryRawOutputPath: boolean =
            !JavaScriptObfuscatorCLI.availableInputExtensions.includes(outputPathExtName);

        if (isDirectoryRawInputPath) {
            if (isDirectoryRawOutputPath) {
                const parsedNormalizedFilePath: path.ParsedPath = path.parse(normalizedFilePath);

                // Make ending with "/" consistent
                if (!parsedNormalizedFilePath.dir.endsWith('/') && this.inputPath.endsWith('/')) {
                    parsedNormalizedFilePath.dir += '/';
                }

                const baseOutputPath: string = path.join(
                    parsedNormalizedFilePath.dir.replace(this.inputPath, ''),
                    parsedNormalizedFilePath.base
                );

                return path.join(normalizedRawOutputPath, baseOutputPath);
            } else {
                throw new Error('Output path for directory obfuscation should be a directory path');
            }
        } else {
            if (isDirectoryRawOutputPath) {
                return path.join(normalizedRawOutputPath, path.basename(filePath));
            } else {
                return normalizedRawOutputPath;
            }
        }
    }

    /**
     * @param {string} outputCodePath
     * @param {string} sourceMapFileName
     * @returns {string}
     */
    public getOutputSourceMapPath(outputCodePath: string, sourceMapFileName: string = ''): string {
        if (!outputCodePath) {
            throw new Error('Output code path is empty');
        }

        sourceMapFileName = this.getUniqueSourceMapFileName(outputCodePath, sourceMapFileName);

        let normalizedOutputCodePath: string = path.normalize(outputCodePath);
        let parsedOutputCodePath: path.ParsedPath = path.parse(normalizedOutputCodePath);

        if (!parsedOutputCodePath.ext && !sourceMapFileName) {
            throw new Error('Source map file name should be set when output code path is a directory path');
        }

        if (sourceMapFileName) {
            const indexOfLastSeparator: number = normalizedOutputCodePath.lastIndexOf(path.sep);
            let sourceMapPath: string;

            if (parsedOutputCodePath.ext) {
                // File path with directory, like: `foo/bar.js`, or without, like: `bar.js`
                const isFilePathWithDirectory: boolean = indexOfLastSeparator > 0;

                sourceMapPath = isFilePathWithDirectory ? normalizedOutputCodePath.slice(0, indexOfLastSeparator) : '';
            } else {
                sourceMapPath = normalizedOutputCodePath;
            }

            // remove possible drive letter for win32 environment
            const normalizedSourceMapFilePath: string = sourceMapFileName.replace(/^[a-zA-Z]:\\*/, '');

            normalizedOutputCodePath = path.join(sourceMapPath, normalizedSourceMapFilePath);
        }

        if (!/\.js\.map$/.test(normalizedOutputCodePath)) {
            parsedOutputCodePath = path.parse(normalizedOutputCodePath);
            const outputCodePathWithoutExtension: string = path.join(
                parsedOutputCodePath.dir,
                parsedOutputCodePath.name
            );

            normalizedOutputCodePath = `${outputCodePathWithoutExtension}.js.map`;
        } else if (/\.js$/.test(normalizedOutputCodePath)) {
            normalizedOutputCodePath += '.map';
        }

        return normalizedOutputCodePath;
    }

    /**
     * @param {string} outputPath
     * @param {string} data
     */
    public writeFile(outputPath: string, data: string): void {
        fs.mkdirSync(path.dirname(outputPath), { recursive: true });

        fs.writeFileSync(outputPath, data, {
            encoding: JavaScriptObfuscatorCLI.encoding
        });
    }

    /**
     * For directory obfuscation a single `sourceMapFileName` would be shared by every file and the
     * source maps would overwrite each other, so it is prefixed with the output code file name to
     * keep each source map unique.
     * https://github.com/javascript-obfuscator/javascript-obfuscator/issues/817
     *
     * @param {string} outputCodePath
     * @param {string} sourceMapFileName
     * @returns {string}
     */
    private getUniqueSourceMapFileName(outputCodePath: string, sourceMapFileName: string): string {
        if (!sourceMapFileName || !this.isDirectoryInputPath()) {
            return sourceMapFileName;
        }

        const outputCodeName: string = path.parse(outputCodePath).name;
        const parsedSourceMapFileName: path.ParsedPath = path.parse(sourceMapFileName);

        // keep any leading directory part of `sourceMapFileName`, prefix only its file name
        return path.join(parsedSourceMapFileName.dir, `${outputCodeName}-${parsedSourceMapFileName.base}`);
    }

    /**
     * @returns {boolean}
     */
    private isDirectoryInputPath(): boolean {
        try {
            return fs.lstatSync(this.inputPath).isDirectory();
        } catch {
            return false;
        }
    }
}