/**
 * @fileoverview Resolve the OpenCode CLI binary across common install paths.
 *
 * Mirrors claude-cli-resolver.ts pattern. Finds the `opencode` binary
 * and provides an augmented PATH string for tmux sessions.
 *
 * @module utils/opencode-cli-resolver
 */
import { execSync } from 'node:child_process';
import { existsSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { homedir } from 'node:os';
import { EXEC_TIMEOUT_MS } from '../config/exec-timeout.js';
/** Common directories where the OpenCode CLI binary may be installed */
const OPENCODE_SEARCH_DIRS = [
    join(homedir(), '.opencode', 'bin'), // Default install location
    join(homedir(), '.local', 'bin'), // Alternative install location
    '/usr/local/bin', // Homebrew / system
    join(homedir(), 'go', 'bin'), // Go install
    join(homedir(), '.bun', 'bin'), // Bun global
    join(homedir(), '.npm-global', 'bin'), // npm global
    join(homedir(), 'bin'), // User bin
];
/** Cached directory containing the opencode binary (empty string = searched but not found) */
let _openCodeDir = null;
/**
 * Finds the directory containing the `opencode` binary.
 * Checks `which opencode` first, then falls back to common install locations.
 * Result is cached for subsequent calls.
 *
 * @returns Directory path, or null if not found
 */
export function resolveOpenCodeDir() {
    if (_openCodeDir !== null)
        return _openCodeDir || null;
    // Try `which` first (respects current PATH)
    try {
        const result = execSync('which opencode', {
            encoding: 'utf-8',
            timeout: EXEC_TIMEOUT_MS,
        }).trim();
        if (result && existsSync(result)) {
            _openCodeDir = dirname(result);
            return _openCodeDir;
        }
    }
    catch {
        // OpenCode not in PATH, will check common locations
    }
    // Fallback: check common installation directories
    for (const dir of OPENCODE_SEARCH_DIRS) {
        if (existsSync(join(dir, 'opencode'))) {
            _openCodeDir = dir;
            return _openCodeDir;
        }
    }
    _openCodeDir = ''; // mark as searched, not found
    return null;
}
/**
 * Check if OpenCode CLI is available on the system.
 */
export function isOpenCodeAvailable() {
    return resolveOpenCodeDir() !== null;
}
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