using CMM.Library.Base;
using CMM.Library.Helpers;
using CMM.Library.ViewModel;
using System.IO;

namespace CMM.Library.Method;

/// <summary> 
/// Control My Monitor Management Command
/// </summary>
public static class CMMCommand
{
    static readonly string CMMTmpFolder = Path.Combine(Path.GetTempPath(), "CMM");
    static readonly string CMMexe       = Path.Combine(AppContext.BaseDirectory, "ControlMyMonitor.exe");
    static readonly string CMMsMonitors = Path.Combine(CMMTmpFolder, "smonitors.tmp");

    public static async Task ScanMonitor()
    {
        // Ensure temp folder exists for output files
        Directory.CreateDirectory(CMMTmpFolder);
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/smonitors {CMMsMonitors}");
    }

    public static async Task PowerOn(string monitorSN)
    {
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/SetValue {monitorSN} D6 1");
    }

    public static async Task Sleep(string monitorSN)
    {
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/SetValue {monitorSN} D6 4");
    }

    private static async Task<string> GetMonitorValue(string monitorSN, string vcpCode = "D6", int maxRetries = 2)
    {
        for (int attempt = 0; attempt <= maxRetries; attempt++)
        {
            // Execute directly without batch file wrapper
            var (output, exitCode) = await ConsoleHelper.ExecuteExeAsync(
                CMMexe,
                $"/GetValue {monitorSN} {vcpCode}");

            // Timeout
            if (exitCode == -1)
                return string.Empty;

            // ControlMyMonitor returns the value as the exit code
            // Exit code > 0 means success with that value
            if (exitCode > 0)
                return exitCode.ToString();

            // Also check stdout in case it outputs there
            var value = output?.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries).LastOrDefault()?.Trim();
            if (!string.IsNullOrEmpty(value) && value != "0")
                return value;

            // Only retry on failure
            if (attempt < maxRetries)
                await Task.Delay(300);
        }

        return string.Empty;
    }

    #region Brightness (VCP Code 10)

    public static async Task SetBrightness(string monitorSN, int value)
    {
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/SetValue {monitorSN} 10 {value}");
    }

    public static async Task<int?> GetBrightness(string monitorSN)
    {
        var value = await GetMonitorValue(monitorSN, "10");
        return int.TryParse(value, out var result) ? result : null;
    }

    #endregion

    #region Contrast (VCP Code 12)

    public static async Task SetContrast(string monitorSN, int value)
    {
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/SetValue {monitorSN} 12 {value}");
    }

    public static async Task<int?> GetContrast(string monitorSN)
    {
        var value = await GetMonitorValue(monitorSN, "12");
        return int.TryParse(value, out var result) ? result : null;
    }

    #endregion

    #region Input Source (VCP Code 60)

    public static async Task SetInputSource(string monitorSN, int value)
    {
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/SetValue {monitorSN} 60 {value}");
    }

    public static async Task<int?> GetInputSource(string monitorSN)
    {
        var value = await GetMonitorValue(monitorSN, "60");
        return int.TryParse(value, out var result) ? result : null;
    }

    public static async Task<List<InputSourceOption>> GetInputSourceOptions(string monitorSN)
    {
        var options = new List<InputSourceOption>();
        var savePath = Path.Combine(CMMTmpFolder, $"{monitorSN}_vcp.tmp");

        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/sjson {savePath} {monitorSN}");

        if (!File.Exists(savePath)) return options;

        var monitorModel = JsonHelper.JsonFormFile<IEnumerable<SMonitorModel>>(savePath);
        var inputSourceVcp = monitorModel?.FirstOrDefault(m => m.VCPCode == "60");

        if (inputSourceVcp?.PossibleValues != null)
        {
            var possibleValues = inputSourceVcp.PossibleValues
                .Split(",", StringSplitOptions.RemoveEmptyEntries)
                .Select(v => int.TryParse(v.Trim(), out var val) ? val : (int?)null)
                .Where(v => v.HasValue)
                .Select(v => v.Value);

            foreach (var value in possibleValues)
            {
                options.Add(new InputSourceOption(value, GetInputSourceName(value)));
            }
        }

        return options;
    }

    public static string GetInputSourceName(int vcpValue)
    {
        return vcpValue switch
        {
            1 => "VGA-1",
            2 => "VGA-2",
            3 => "DVI-1",
            4 => "DVI-2",
            5 => "Composite-1",
            6 => "Composite-2",
            7 => "S-Video-1",
            8 => "S-Video-2",
            9 => "Tuner-1",
            10 => "Tuner-2",
            11 => "Tuner-3",
            12 => "Component-1",
            13 => "Component-2",
            14 => "Component-3",
            15 => "DisplayPort-1",
            16 => "DisplayPort-2",
            17 => "HDMI-1",
            18 => "HDMI-2",
            _ => $"Input-{vcpValue}"
        };
    }

    #endregion

    public static async Task<string> GetMonPowerStatus(string monitorSN)
    {
        var status = await GetMonitorValue(monitorSN);

        return status switch
        {
            "1" => "PowerOn",
            "4" => "Sleep",
            "5" => "PowerOff",
            _ => string.Empty
        };
    }

    public static async Task ScanMonitorStatus(IEnumerable<XMonitor> monitors)
    {
        var taskList = monitors.Select(x =>
        {
            return ScanMonitorStatus($"{CMMTmpFolder}\\{x.SerialNumber}.tmp", x);
        });

        await Task.WhenAll(taskList);
    }

    static async Task ScanMonitorStatus(string savePath, XMonitor mon)
    {
        await ConsoleHelper.ExecuteExeAsync(CMMexe, $"/sjson {savePath} {mon.MonitorID}");
        var monitorModel = JsonHelper.JsonFormFile<IEnumerable<SMonitorModel>>(savePath);

        var status = monitorModel.ReadMonitorStatus();

        mon.Status = new ObservableRangeCollection<XMonitorStatus>(status);
    }

    /// <summary>
    /// 取得螢幕狀態
    /// </summary>
    public static IEnumerable<XMonitorStatus> ReadMonitorStatus(this IEnumerable<SMonitorModel> monitorModel)
    {
        foreach (var m in monitorModel)
        {       
            yield return new XMonitorStatus
            {
                VCP_Code = m.VCPCode,
                VCPCodeName = m.VCPCodeName,
                Read_Write = m.ReadWrite,
                CurrentValue = TryGetInt(m.CurrentValue),
                MaximumValue = TryGetInt(m.MaximumValue),
                PossibleValues = TryGetArrStr(m.PossibleValues),
            };
        }

        IEnumerable<int> TryGetArrStr(string str)
        {
            return str.Split(",", StringSplitOptions.RemoveEmptyEntries)
                .Select(x => TryGetInt(x))
                .Where(x => x != null)
                .Select(x => (int)x)
                .ToList();
        }

        int? TryGetInt(string str)
        {
            return int.TryParse(str, out var value)
                ? value
                : null;
        }
    }

    /// <summary>
    /// 取得螢幕清單
    /// </summary>
    public static async Task<IEnumerable<XMonitor>> ReadMonitorsData()
    {
        var monitors = new List<XMonitor>();

        if (!File.Exists(CMMsMonitors)) return monitors;

        // Read with UTF-16 LE encoding (ControlMyMonitor outputs UTF-16)
        var rawBytes = await File.ReadAllBytesAsync(CMMsMonitors);
        var content = System.Text.Encoding.Unicode.GetString(rawBytes);

        XMonitor? mon = null;
        foreach (var line in content.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries))
        {
            var colonIdx = line.IndexOf(':');
            if (colonIdx < 0) continue;

            var key = line.Substring(0, colonIdx).Trim();
            var val = line.Substring(colonIdx + 1).Trim().Trim('"');

            if (key.Contains("Monitor Device Name"))
            {
                mon = new XMonitor { MonitorDeviceName = val };
            }
            else if (mon != null && key.Contains("Monitor Name"))
            {
                mon.MonitorName = val;
            }
            else if (mon != null && key.Contains("Serial Number"))
            {
                mon.SerialNumber = val;
            }
            else if (mon != null && key.Contains("Adapter Name"))
            {
                mon.AdapterName = val;
            }
            else if (mon != null && key.Contains("Monitor ID"))
            {
                mon.MonitorID = val;
                if (!string.IsNullOrEmpty(mon.SerialNumber))
                    monitors.Add(mon);
                mon = null;
            }
        }

        return monitors;
    }

}