/**
 * Load a bulk CONFIG_ENV secret into process.env.
 *
 * This module intentionally does not write CONFIG_ENV to disk. Explicit
 * environment variables always win over values from CONFIG_ENV.
 */

function unquote(value) {
    if (value.length >= 2) {
        const first = value[0];
        const last = value[value.length - 1];
        if ((first === '"' && last === '"') || (first === "'" && last === "'")) {
            return value.slice(1, -1);
        }
    }
    return value;
}

export function parseConfigEnvBlock(block) {
    const parsed = {};
    if (!block || typeof block !== 'string') return parsed;

    for (const rawLine of block.split(/\r?\n/)) {
        let line = rawLine.trim();
        if (!line || line.startsWith('#')) continue;
        if (line.startsWith('export ')) line = line.slice(7).trim();

        const separatorIndex = line.indexOf('=');
        if (separatorIndex <= 0) continue;

        const key = line.slice(0, separatorIndex).trim();
        const value = unquote(line.slice(separatorIndex + 1).trim());

        if (!/^[A-Za-z_][A-Za-z0-9_]*$/.test(key)) continue;
        parsed[key] = value;
    }

    return parsed;
}

export function applyConfigEnv(block = process.env.CONFIG_ENV, target = process.env) {
    const parsed = parseConfigEnvBlock(block);
    let applied = 0;

    for (const [key, value] of Object.entries(parsed)) {
        if (target[key] === undefined || target[key] === '') {
            target[key] = value;
            applied++;
        }
    }

    return { parsed: Object.keys(parsed).length, applied };
}

const result = applyConfigEnv();
if (result.applied > 0) {
    console.info(`[Bootstrap] Loaded ${result.applied} variable(s) from CONFIG_ENV`);
}