import fs from 'fs';

/*
 * @notice Get the list of networks included in the contract deploy at path
 * @param path relative path to core system deploy
 * @return list of networks deployed as strings
 * */
export function getNetworksFromDeploy(path: string): string[] {
    const targetFileSuffix = `_contracts.json`;

    const deployOutputFileNames = fs
        .readdirSync(path, { withFileTypes: true })
        .map((dirEntry: fs.Dirent) => dirEntry.name)
        .filter((fileName: string) => fileName.includes(targetFileSuffix));

    let chainNames: string[] = [];
    for (let deployOutputFileName of deployOutputFileNames) {
        const tokens: string[] = deployOutputFileName.split('_');
        const chainName: string = tokens[0];
        chainNames.push(chainName);
    }
    return chainNames;
}

/*
 * @notice Return the path to the folder with the greatest name
 * within the folder at configPath,
 * (excluding any folders within ignoreFolders)
 * @param configPath relative path to top directory
 * @param ignoreFolders names of folders to exclude within configPath
 * @return path to folder
 * */
function getPathToLatestConfig(configPath: string, ignoreFolders: string[] = []) {
    // get the names of all non-default config directories within the relative configPath
    let configFolders: string[] = fs
        .readdirSync(configPath, {withFileTypes: true})
        .filter(
            (dirEntry: fs.Dirent) =>
                dirEntry.isDirectory() && !ignoreFolders.includes(dirEntry.name),
        )
        .map((dirEntry: fs.Dirent) => dirEntry.name);

    // if no non-default config folders are found, return
    if (configFolders.length == 0) {
        throw new Error('No config folders found');
    }

    // get path to newest generated config folder
    // (config folder names are UTC strings of the date they were generated - the greatest string is newest folder)
    const newestConfigFolder: string = configFolders.reduce((a, b) => {
        return a > b ? a : b;
    });
    return `${configPath}/${newestConfigFolder}`;
}

/*
 * @notice Return the path to the *most recent* bridge deploy configs
 * from the *most recent* core contract deploy
 * @return path to folder
 * */
export function getPathToLatestBridgeDeploy(): string {
    const latestCoreDeployPath = getPathToLatestDeploy();
    return getPathToLatestConfig(latestCoreDeployPath);
}

/*
 * @notice Return the path to the *most recent* contract deploy configs
 * @return path to folder
 * */
export function getPathToLatestDeploy(): string {
    const configPath = '../../rust/config';
    const ignoreFolders = ["default"];
    return getPathToLatestConfig(configPath, ignoreFolders);
}

/*
 * @notice Return the JSON-parsed file specified
 * for the contract deploy at path
 * for the network & filetype
 * Throw if the file is not found
 * @param path relative path to core system deploy
 * @param network target network to parse ("alfajores", "kovan"")
 * @param fileSuffix target file suffix to parse ("config", "contracts", "verification")
 * */
export function parseFileFromDeploy(
    path: string,
    network: string,
    fileSuffix: string,
): any {
    const targetFileName = `${network}_${fileSuffix}.json`;

    const file = fs
        .readdirSync(path, { withFileTypes: true })
        .find((dirEntry: fs.Dirent) => dirEntry.name == targetFileName);

    if (!file) {
        throw new Error(
            `No ${fileSuffix} files found for ${network} at ${path}/${targetFileName}`,
        );
    }

    const fileString: string = fs
        .readFileSync(`${path}/${targetFileName}`)
        .toString();

    return JSON.parse(fileString);
}