using System;
using UnityEngine;

namespace ProjectM.Client
{
    /// <summary>
    /// Serializable client settings model (Graphics + Audio) persisted to JSON by <see cref="SettingsService"/>.
    /// Flat fields only (an enum stored as an int) so <c>JsonUtility</c> round-trips it without Newtonsoft.
    /// <see cref="Version"/> gates forward-compatible migration. Purely client-local — never replicated (the
    /// server has no opinion on a player's resolution or volume).
    /// </summary>
    [Serializable]
    public struct GameSettings
    {
        public const int CurrentVersion = 1;

        public int Version;

        // ---- Graphics ----
        public int ResWidth;
        public int ResHeight;
        public int RefreshHz;       // 0 = platform default
        public int FullScreenMode;  // (int)UnityEngine.FullScreenMode (0 Exclusive,1 FullScreenWindow,2 Maximized,3 Windowed)
        public int QualityLevel;
        public int VSync;           // QualitySettings.vSyncCount: 0/1/2
        public int TargetFps;       // Application.targetFrameRate: -1 = uncapped

        // ---- Audio (0..1) ----
        public float Master;
        public float Music;
        public float Sfx;

        /// <summary>Sensible defaults derived from the current display + active quality level.</summary>
        public static GameSettings Defaults()
        {
            var r = Screen.currentResolution;
            return new GameSettings
            {
                Version = CurrentVersion,
                ResWidth = r.width > 0 ? r.width : 1920,
                ResHeight = r.height > 0 ? r.height : 1080,
                RefreshHz = 0,
                FullScreenMode = (int)UnityEngine.FullScreenMode.FullScreenWindow,
                QualityLevel = QualitySettings.GetQualityLevel(),
                VSync = 1,
                TargetFps = -1,
                Master = 1f,
                Music = 1f,
                Sfx = 1f,
            };
        }

        /// <summary>Clamp every field into a safe range (defensive against hand-edited / corrupt JSON).</summary>
        public GameSettings Clamped()
        {
            var s = this;
            s.ResWidth = Mathf.Clamp(s.ResWidth <= 0 ? 1920 : s.ResWidth, 640, 7680);
            s.ResHeight = Mathf.Clamp(s.ResHeight <= 0 ? 1080 : s.ResHeight, 480, 4320);
            s.RefreshHz = Mathf.Max(0, s.RefreshHz);
            s.FullScreenMode = Mathf.Clamp(s.FullScreenMode, 0, 3);
            int qn = (QualitySettings.names != null && QualitySettings.names.Length > 0) ? QualitySettings.names.Length : 1;
            s.QualityLevel = Mathf.Clamp(s.QualityLevel, 0, qn - 1);
            s.VSync = Mathf.Clamp(s.VSync, 0, 2);
            s.TargetFps = s.TargetFps <= 0 ? -1 : Mathf.Clamp(s.TargetFps, 20, 1000);
            s.Master = Mathf.Clamp01(s.Master);
            s.Music = Mathf.Clamp01(s.Music);
            s.Sfx = Mathf.Clamp01(s.Sfx);
            return s;
        }
    }
}