// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics;
using Microsoft.Extensions.Logging;
using Semver;
 
namespace Aspire.Cli.OpenCode;
 
/// <summary>
/// Runs OpenCode CLI commands.
/// </summary>
/// <param name="logger">The logger for diagnostic output.</param>
internal sealed class OpenCodeCliRunner(ILogger<OpenCodeCliRunner> logger) : IOpenCodeCliRunner
{
    /// <inheritdoc />
    public async Task<SemVersion?> GetVersionAsync(CancellationToken cancellationToken)
    {
        logger.LogDebug("Checking for OpenCode CLI installation");
 
        try
        {
            var result = await Process.RunAndCaptureTextAsync(new ProcessStartInfo("opencode", "--version")
            {
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                CreateNoWindow = true
            }, cancellationToken).ConfigureAwait(false);
 
            if (result.ExitStatus.ExitCode != 0)
            {
                logger.LogDebug("OpenCode CLI returned non-zero exit code {ExitCode}: {Error}", result.ExitStatus.ExitCode, result.StandardError.Trim());
                return null;
            }
 
            var output = result.StandardOutput;
            var versionString = output.Trim();
 
            if (string.IsNullOrEmpty(versionString))
            {
                logger.LogDebug("OpenCode CLI returned empty version output");
                return null;
            }
 
            // Try to parse the version string (may have a 'v' prefix like "v1.2.3")
            if (versionString.StartsWith('v') || versionString.StartsWith('V'))
            {
                versionString = versionString[1..];
            }
 
            if (SemVersion.TryParse(versionString, SemVersionStyles.Any, out var version))
            {
                logger.LogDebug("Found OpenCode CLI version: {Version}", version);
                return version;
            }
 
            logger.LogDebug("Could not parse OpenCode CLI version from output: {Output}", output.Trim());
            return null;
        }
        catch (Exception ex) when (ex is InvalidOperationException or System.ComponentModel.Win32Exception)
        {
            logger.LogDebug(ex, "OpenCode CLI is not installed or not found in PATH");
            return null;
        }
    }
}