#region license
// This file is part of Vocaluxe.
// 
// Vocaluxe is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// Vocaluxe is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
#endregion

using System;
using System.Diagnostics;
using System.Xml.Serialization;
using VocaluxeLib.Draw;

namespace VocaluxeLib.Menu
{
    [XmlType("Button")]
    public struct SThemeButton
    {
        [XmlAttribute(AttributeName = "Name")]
        public string Name;

        public string Skin;
        public string SkinSelected;
        public SRectF Rect;
        public SThemeColor Color;
        public SThemeColor SelColor;
        public SThemeText Text;
        public SThemeText? SelText;
        public SReflection? Reflection;
        public SReflection? SelReflection;
    }

    public sealed class CButton : CMenuElementBase, IMenuElement, IThemeable
    {
        private SThemeButton _Theme;
        private readonly int _PartyModeId;

        public CTextureRef Texture;
        public CTextureRef SelTexture;
        public SColorF Color;
        public SColorF SelColor;

        public CText Text;
        private CText _SelText;

        private bool _Reflection;
        private float _ReflectionSpace;
        private float _ReflectionHeight;

        private bool _SelReflection;
        private float _SelReflectionSpace;
        private float _SelReflectionHeight;

        public bool Pressed;

        public bool EditMode
        {
            get { return Text.EditMode; }
            set
            {
                Text.EditMode = value;
                if (_SelText != null)
                {
                    _SelText.EditMode = value;
                }
            }
        }

        private readonly Stopwatch _SelectTimer = new Stopwatch();

        public override bool Selected
        {
            set
            {
                if (value && !base.Selected)
                {
                    _SelectTimer.Restart();
                }

                base.Selected = value;
                Text.Selected = value;
            }
        }
        private bool _Selectable = true;

        public bool Selectable
        {
            get { return _Selectable && Visible; }
            set
            {
                _Selectable = value;
                if (!_Selectable)
                {
                    Selected = false;
                }
            }
        }

        public string GetThemeName()
        {
            return _Theme.Name;
        }

        public bool ThemeLoaded { get; private set; }

        public CButton(int partyModeId)
        {
            _PartyModeId = partyModeId;
            Text = new CText(_PartyModeId);
            _SelText = new CText(_PartyModeId);
            Selected = false;
            EditMode = false;
        }

        public CButton(SThemeButton theme, int partyModeId, bool buttonText = false)
        {
            _PartyModeId = partyModeId;
            _Theme = theme;

            Text = new CText(_Theme.Text, _PartyModeId, buttonText);
            _SelText = _Theme.SelText.HasValue ? new CText(_Theme.SelText.Value, _PartyModeId, buttonText) : null;

            Selected = false;
            EditMode = false;

            ThemeLoaded = true;
        }

        public CButton(CButton button)
        {
            _PartyModeId = button._PartyModeId;
            _Theme = new SThemeButton
            {
                Skin = button._Theme.Skin,
                SkinSelected = button._Theme.SkinSelected
            };

            MaxRect = button.MaxRect;
            Color = button.Color;
            SelColor = button.SelColor;
            Texture = button.Texture;
            SelTexture = button.SelTexture;

            Text = new CText(button.Text);
            _SelText = _SelText == null ? null : new CText(button._SelText);
            Selected = false;
            EditMode = false;
            _Selectable = button._Selectable;

            _Reflection = button._Reflection;
            _ReflectionHeight = button._ReflectionHeight;
            _ReflectionSpace = button._ReflectionSpace;

            _SelReflection = button._SelReflection;
            _SelReflectionHeight = button._SelReflectionHeight;
            _SelReflectionSpace = button._SelReflectionSpace;
        }

        private void _ReadSubThemeElements()
        {
            _Theme.Text = (SThemeText)Text.GetTheme();
            if (_SelText == null)
            {
                _Theme.SelText = null;
            }
            else
            {
                _Theme.SelText = (SThemeText)_SelText.GetTheme();
            }
        }

        public void Draw()
        {
            var scale = _GetSelectionScale();
            if (scale > 1f)
            {
                CBase.Drawing.PushTransform(scale, Rect.X + Rect.W / 2f, Rect.Y + Rect.H / 2f, 0f, 1f);
                _DrawButton();
                CBase.Drawing.PopTransform();
            }
            else
            {
                _DrawButton();
            }
        }

        private float _GetSelectionScale()
        {
            if (!Selected || !_Selectable || !_SelectTimer.IsRunning || CBase.Settings.GetProgramState() == EProgramState.EditTheme)
            {
                return 1f;
            }

            var progress = _SelectTimer.ElapsedMilliseconds / 450f;
            if (progress >= 1f)
            {
                _SelectTimer.Stop();
                return 1f;
            }

            return 1f + 0.025f * (float)Math.Sin(Math.PI * progress);
        }

        private void _DrawButton()
        {
            if (!Visible && CBase.Settings.GetProgramState() != EProgramState.EditTheme)
            {
                return;
            }

            CTextureRef texture;

            if (!Selected && !Pressed || !_Selectable)
            {
                texture = Texture ?? CBase.Themes.GetSkinTexture(_Theme.Skin, _PartyModeId);

                CBase.Drawing.DrawTexture(texture, Rect, Color);

                if (_Reflection)
                {
                    CBase.Drawing.DrawTextureReflection(texture, Rect, Color, Rect, _ReflectionSpace, _ReflectionHeight);
                    Text.DrawRelative(Rect.X, Rect.Y, _ReflectionHeight, _ReflectionSpace, Rect.H);
                }
                else
                {
                    Text.DrawRelative(Rect.X, Rect.Y);
                }
            }
            else if (_SelText == null)
            {
                texture = SelTexture ?? CBase.Themes.GetSkinTexture(_Theme.SkinSelected, _PartyModeId);

                CBase.Drawing.DrawTexture(texture, Rect, SelColor);

                if (_Reflection)
                {
                    CBase.Drawing.DrawTextureReflection(texture, Rect, SelColor, Rect, _ReflectionSpace, _ReflectionHeight);
                    Text.DrawRelative(Rect.X, Rect.Y, _ReflectionHeight, _ReflectionSpace, Rect.H);
                }
                else
                {
                    Text.DrawRelative(Rect.X, Rect.Y);
                }
            }
            else
            {
                texture = SelTexture ?? CBase.Themes.GetSkinTexture(_Theme.SkinSelected, _PartyModeId);

                CBase.Drawing.DrawTexture(texture, Rect, SelColor);

                if (_Reflection)
                {
                    CBase.Drawing.DrawTextureReflection(texture, Rect, SelColor, Rect, _ReflectionSpace, _ReflectionHeight);
                    _SelText.DrawRelative(Rect.X, Rect.Y, _ReflectionHeight, _ReflectionSpace, Rect.H);
                }
                else
                {
                    _SelText.DrawRelative(Rect.X, Rect.Y);
                }
            }
        }

        public void UnloadSkin()
        {
            if (!ThemeLoaded)
            {
                return;
            }

            Text.UnloadSkin();
        }

        public void LoadSkin()
        {
            if (!ThemeLoaded)
            {
                return;
            }

            Text = new CText(_Theme.Text, _PartyModeId);
            Text.LoadSkin();
            Text.Selected = Selected;

            if (_Theme.SelText.HasValue)
            {
                _SelText = new CText(_Theme.SelText.Value, _PartyModeId);
                _SelText.LoadSkin();
            }

            _Theme.Color.Get(_PartyModeId, out Color);
            _Theme.SelColor.Get(_PartyModeId, out SelColor);

            MaxRect = _Theme.Rect;

            _Reflection = _Theme.Reflection.HasValue;
            if (_Reflection)
            {
                Debug.Assert(_Theme.Reflection != null);
                _ReflectionHeight = _Theme.Reflection.Value.Height;
                _ReflectionSpace = _Theme.Reflection.Value.Space;
            }

            _SelReflection = _Theme.Reflection.HasValue;
            if (_SelReflection)
            {
                Debug.Assert(_Theme.SelReflection != null);
                _SelReflectionHeight = _Theme.SelReflection.Value.Height;
                _SelReflectionSpace = _Theme.SelReflection.Value.Space;
            }

            if (_Theme.Rect.Z < Text.Z)
            {
                Text.Z = _Theme.Rect.Z;
            }
        }

        public void ReloadSkin()
        {
            UnloadSkin();
            LoadSkin();
        }

        public object GetTheme()
        {
            _ReadSubThemeElements();
            return _Theme;
        }

        #region ThemeEdit
        public void MoveElement(int stepX, int stepY)
        {
            X += stepX;
            Y += stepY;

            _Theme.Rect.X += stepX;
            _Theme.Rect.Y += stepY;
        }

        public void ResizeElement(int stepW, int stepH)
        {
            W += stepW;
            if (W <= 0)
            {
                W = 1;
            }

            H += stepH;
            if (H <= 0)
            {
                H = 1;
            }

            _Theme.Rect.W = Rect.W;
            _Theme.Rect.H = Rect.H;
        }
        #endregion ThemeEdit
    }
}