using System.Text.Json;
using System.Text.Json.Serialization;

namespace VFXReviewWorker;

/// <summary>
/// Machine-local config (RenderPipeline2 §7.8) — deliberately minimal;
/// everything tunable lives in server SystemConfig and arrives via E6.
/// Default path: C:\ProgramData\VFXReviewWorker\config.json
/// </summary>
public sealed class WorkerOptions
{
    public string ServerUrl { get; set; } = "";
    public string ApiKey { get; set; } = "";
    public string MachineName { get; set; } = Environment.MachineName;
    public string AerenderPath { get; set; } = @"C:\Program Files\Adobe\Adobe After Effects 2026\Support Files\aerender.exe";
    /// <summary>AfterFX.com — the console AE used for the headless preview build. Defaults beside aerender.</summary>
    public string? AfterFxPath { get; set; }
    /// <summary>vfxr_build_preview.jsx — defaults to scripts\ beside the worker exe.</summary>
    public string? PreviewScriptPath { get; set; }
    public string? FfmpegPath { get; set; }
    public string? OiiotoolPath { get; set; }
    public List<PathMapping> PathMappings { get; set; } = new();
    public string WorkerVersion { get; set; } = "1.0.0";
    public string? AeVersion { get; set; }

    public static string DataDir =>
        Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), "VFXReviewWorker");

    public static string DefaultConfigPath => Path.Combine(DataDir, "config.json");
    public static string LogsDir => Path.Combine(DataDir, "logs");
    public static string SpoolDir => Path.Combine(DataDir, "spool");
    public static string ScratchDir => Path.Combine(DataDir, "scratch");
    public static string StateFilePath => Path.Combine(DataDir, "current-job.json");

    /// <summary>AfterFX.com sits beside aerender.exe in a standard AE install.</summary>
    public string ResolveAfterFxPath()
    {
        if (!string.IsNullOrWhiteSpace(AfterFxPath)) return AfterFxPath;
        var dir = Path.GetDirectoryName(AerenderPath);
        return dir is null ? "AfterFX.com" : Path.Combine(dir, "AfterFX.com");
    }

    public string ResolvePreviewScriptPath()
    {
        if (!string.IsNullOrWhiteSpace(PreviewScriptPath)) return PreviewScriptPath;
        return Path.Combine(AppContext.BaseDirectory, "scripts", "vfxr_build_preview.jsx");
    }

    public static WorkerOptions Load(string? path = null)
    {
        path ??= DefaultConfigPath;
        if (!File.Exists(path))
        {
            throw new FileNotFoundException(
                $"Worker config not found at {path}. Create it with serverUrl, apiKey and machineName (see RenderWorker/README.md).");
        }
        var json = File.ReadAllText(path);
        var opts = JsonSerializer.Deserialize<WorkerOptions>(json, JsonOpts)
                   ?? throw new InvalidOperationException($"Could not parse {path}");
        if (string.IsNullOrWhiteSpace(opts.ServerUrl)) throw new InvalidOperationException("config.json: serverUrl is required");
        if (string.IsNullOrWhiteSpace(opts.ApiKey)) throw new InvalidOperationException("config.json: apiKey is required");
        if (string.IsNullOrWhiteSpace(opts.MachineName)) opts.MachineName = Environment.MachineName;
        return opts;
    }

    public static readonly JsonSerializerOptions JsonOpts = new()
    {
        PropertyNameCaseInsensitive = true,
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
    };
}

public sealed class PathMapping
{
    public string From { get; set; } = "";
    public string To { get; set; } = "";
}