import Nconf from 'nconf';
import path from 'node:path';
import {bindAll as bindUrlHelpers, type BoundHelpers} from '@tryghost/config-url-helpers';
import * as localUtils from './utils';
import {bindAll as bindHelpers, type ConfigHelpers} from './helpers';

const _debug = require('@tryghost/debug')._base;
const debug = _debug('ghost:config');

interface LoadNconfOptions {
    baseConfigPath?: string;
    customConfigPath?: string;
}

export type ConfigInstance = Nconf.Provider & BoundHelpers & ConfigHelpers;

function loadNconf(options?: LoadNconfOptions): ConfigInstance {
    debug('config start');
    const env = localUtils.getNodeEnv();
    options = options || {};

    const baseConfigPath = options.baseConfigPath || __dirname;
    const customConfigPath = options.customConfigPath || process.cwd();
    const nconf = new Nconf.Provider();

    // ## Load Config

    // no channel can override the overrides
    nconf.file('overrides', path.join(baseConfigPath, 'overrides.json'));

    // command line arguments take precedence, then environment variables
    nconf.argv();
    nconf.env({separator: '__', parseValues: true});

    // Now load various config json files
    nconf.file('custom-env', path.join(customConfigPath, 'config.' + env + '.json'));
    if (!env.startsWith('testing')) {
        if (process.env.GHOST_DEV_IS_DOCKER === 'true') {
            nconf.file('docker-env', path.join(baseConfigPath, 'env', 'config.development.docker.json'));
        }
        nconf.file('local-env', path.join(customConfigPath, 'config.local.json'));
        nconf.file('local-env-jsonc', {
            file: path.join(customConfigPath, 'config.local.jsonc'),
            format: localUtils.jsoncFormat
        });
    }
    nconf.file('default-env', path.join(baseConfigPath, 'env', 'config.' + env + '.json'));

    // Finally, we load defaults, if nothing else has a value this will
    nconf.file('defaults', path.join(baseConfigPath, 'defaults.json'));

    // ## Config Methods

    // Expose dynamic utility methods
    bindUrlHelpers(nconf);
    bindHelpers(nconf);

    // ## Sanitization

    // transform all relative paths to absolute paths
    localUtils.makePathsAbsolute(nconf, nconf.get('paths'), 'paths');

    // transform sqlite filename path for Ghost-CLI
    localUtils.sanitizeDatabaseProperties(nconf);

    // Check if the URL in config has a protocol
    localUtils.checkUrlProtocol(nconf.get('url'));

    // Ensure that the content path exists
    localUtils.doesContentPathExist(nconf.get('paths:contentPath'));

    // ## Other Stuff!

    // Manually set values
    nconf.set('env', env);

    // Wrap this in a check, because else nconf.get() is executed unnecessarily
    // To output this, use DEBUG=ghost:*,ghost-config
    if (_debug.enabled('ghost-config')) {
        debug(nconf.get());
    }

    debug('config end');
    return nconf;
}

export {loadNconf};