import path from 'node:path';

// Conventional filenames
export const FEATURE_FILENAME_HINT = '.feature.';
export const CONFIG_FILENAME_HINT = '.config.';
export const ENV_FILENAME_HINT = '.env.';
export const PRELOAD_FILENAME_HINT = '.preload.';
export const CONTEXT_FILENAME_HINT = '.context.';
export const ENGINE_CONFIG_FILE_NAME = 'engine.config.js';

// Packages
export const CORE_PACKAGE = '@dazl/engine-core';

// Used query params
export const CONFIG_QUERY_PARAM = 'config';
export const FEATURE_QUERY_PARAM = 'feature';

// File naming helpers
export function isCodeModule(fileName: string) {
    const fileExtension = path.extname(fileName);
    switch (fileExtension) {
        case '.ts':
        case '.mts':
        case '.cts':
            return path.extname(path.basename(fileName, fileExtension)) !== '.d';
        case '.tsx':
        case '.js':
        case '.mjs':
        case '.cjs':
            return true;
        default:
            return false;
    }
}

export const isConfigFile = (fileName: string) => fileName.indexOf(CONFIG_FILENAME_HINT) >= 1 && isCodeModule(fileName);
export const isEnvFile = (fileName: string) => fileName.indexOf(ENV_FILENAME_HINT) >= 1 && isCodeModule(fileName);
export const isPreloadFile = (fileName: string) =>
    fileName.indexOf(PRELOAD_FILENAME_HINT) >= 1 && isCodeModule(fileName);
export const isFeatureFile = (fileName: string) =>
    fileName.indexOf(FEATURE_FILENAME_HINT) >= 1 && isCodeModule(fileName);
export const isContextFile = (fileName: string) =>
    fileName.indexOf(CONTEXT_FILENAME_HINT) >= 1 && isCodeModule(fileName);

export function parseFeatureFileName(fileName: string): string {
    return fileName.split(FEATURE_FILENAME_HINT).shift()!;
}

export function parseConfigFileName(fileName: string) {
    const fullConfigName = fileName.split(CONFIG_FILENAME_HINT).shift()!;
    const envName = path.extname(fullConfigName);
    const configName = path.basename(fullConfigName, envName);
    return {
        fullConfigName,
        configName,
        envName: envName.slice(1),
    };
}

export type FileNameParser = (fileName: string) => {
    featureName: string;
    envName: string;
    childEnvName?: string;
};

export const parseEnvFileName: FileNameParser = (fileName) => {
    const [featureName, envName, childEnvName] = fileName.split(ENV_FILENAME_HINT).shift()!.split('.');

    if (!featureName || !envName) {
        throw new Error(`cannot parse env file: ${fileName}`);
    }

    return { featureName, envName, childEnvName };
};

export const parseContextFileName: FileNameParser = (fileName) => {
    const [featureName, envName, childEnvName] = fileName.split(CONTEXT_FILENAME_HINT).shift()!.split('.');

    if (!featureName || !envName || !childEnvName) {
        throw new Error(`cannot parse context file: ${fileName}`);
    }
    return { featureName, envName, childEnvName };
};

export const parsePreloadFileName: FileNameParser = (fileName) => {
    const [featureName, envName, childEnvNameCandidate] = fileName.split(PRELOAD_FILENAME_HINT).shift()!.split('.');

    if (!featureName || !envName) {
        throw new Error(`cannot parse preload file: ${fileName}`);
    }

    return { featureName, envName, childEnvName: childEnvNameCandidate };
};