using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

namespace ActionTool
{

    public class ActionPreviewEditor : EditorWindow
    {
        Texture m_UITextureStop;
        Texture m_UITexturePause;
        Texture m_UITexturePlay;
        Texture m_UITextureNext;
        Texture m_UITextureEnd;
        Texture m_UITexturePrevious;
        Texture m_UITextureStart;

        GUIStyle m_StyleBold;

        const float kToolbarControlMargin = 5;
        const float kToolbarHeight = 50;
        const float kToolbarControlSize = kToolbarHeight - kToolbarControlMargin * 2;
        const float kTimeLineViewXOffset = 20;
        const float kFrameWidth = 10;
        const float kFrameHeight = 20;

        ActionEditorStyles styles;
        ActionEditorUI ui;

        private void OnEnable()
        {
            titleContent = new GUIContent("Action Preview");

            m_UITextureStop = (Texture)Resources.Load("button_control_stop");
            m_UITexturePause = (Texture)Resources.Load("button_control_pause");
            m_UITexturePlay = (Texture)Resources.Load("button_control_play");
            m_UITextureNext = (Texture)Resources.Load("button_control_next");
            m_UITextureEnd = (Texture)Resources.Load("button_control_end"); 
            m_UITexturePrevious = (Texture)Resources.Load("button_control_previous");
            m_UITextureStart = (Texture)Resources.Load("button_control_start");

            styles = ActionEditorStyles.Get();
        }

        void Update()
        {
            ActionManager.UpdateFrame();
        }

        private void OnDisable()
        {
            ActionManager.PreviewWindow = null;
        }

        private void OnGUI()
        {
            if (ActionManager.CurrentAnimationName == null || ActionManager.CurrentAnimationName == "")
            {
                EditorGUILayout.HelpBox("选择动画", MessageType.Warning);
                return;
            }

            if (styles == null) styles = ActionEditorStyles.Get();
            if (ui == null) ui = ActionEditorUI.Get();

            GUI_Toolbar();
            GUI_Detail();
            GUI_TimeLineView();
        }

        void GUI_Toolbar()
        {
            float x = 0, y = kToolbarControlMargin;
            GUI_Toolbar_BG();
            GUI_Toolbar_Start(ref x, ref y);
            GUI_Toolbar_Previous(ref x, ref y);
            GUI_Toolbar_Stop(ref x, ref y);
            GUI_Toolbar_Pause(ref x, ref y);
            GUI_Toolbar_Next(ref x, ref y);
            GUI_Toolbar_End(ref x, ref y);
        }

        void GUI_Toolbar_BG()
        {
            GUI.DrawTexture(new Rect(0, 0, position.width, 50), EditorStyles.toolbar.normal.background);
        }

        void GUI_Toolbar_Start(ref float x, ref float y)
        {
            x += kToolbarControlMargin;
            Rect rect = new Rect(x, y, kToolbarControlSize, kToolbarControlSize);
            if(GUI.Button(rect, m_UITextureStart))
            {
                ActionManager.Start();
            }
            x += kToolbarControlSize;
        }

        void GUI_Toolbar_Previous(ref float x, ref float y)
        {
            x += kToolbarControlMargin;
            Rect rect = new Rect(x, y, kToolbarControlSize, kToolbarControlSize);
            if (GUI.Button(rect, m_UITexturePrevious))
            {
                ActionManager.Previous();
            }
            x += kToolbarControlSize;
        }

        void GUI_Toolbar_Stop(ref float x, ref float y)
        {
            x += kToolbarControlMargin;
            Rect rect = new Rect(x, y, kToolbarControlSize, kToolbarControlSize);
            if (GUI.Button(rect, m_UITextureStop))
            {
                ActionManager.Stop();
            }
            x += kToolbarControlSize;
        }

        void GUI_Toolbar_Pause(ref float x, ref float y)
        {
            x += kToolbarControlMargin;
            Rect rect = new Rect(x, y, kToolbarControlSize, kToolbarControlSize);
            Texture tex = ActionManager.IsPlay ? m_UITexturePlay : m_UITexturePause;
            if (GUI.Button(rect, tex))
            {
                ActionManager.Pause();
            }
            x += kToolbarControlSize;
        }

        void GUI_Toolbar_Next(ref float x, ref float y)
        {
            x += kToolbarControlMargin;
            Rect rect = new Rect(x, y, kToolbarControlSize, kToolbarControlSize);
            if (GUI.Button(rect, m_UITextureNext))
            {
                ActionManager.Next();
            }
            x += kToolbarControlSize;
        }

        void GUI_Toolbar_End(ref float x, ref float y)
        {
            x += kToolbarControlMargin;
            Rect rect = new Rect(x, y, kToolbarControlSize, kToolbarControlSize);
            if (GUI.Button(rect, m_UITextureEnd))
            {
                ActionManager.End();
            }
            x += kToolbarControlSize;
        }

        void GUI_Detail()
        {
            float y = kToolbarHeight + 5;
            float x = 5;

            GUI.Label(new Rect(x, y, 105, 20), "Animation Name:");
            x += 105;
            GUI.Label(new Rect(x, y, 210, 20), ActionManager.CurrentAnimationName, styles.textBold);
            x += 200;
        }

        void GUI_TimeLineView()
        {
            if (ActionManager.actionData == null)
                return;

            float y = 80;

            GUI_FrameText(ref y);
            GUI_Slider(ref y);
            GUI_Grid(ref y);
            GUI_Events(ref y);
        }

        void GUI_FrameText(ref float y)
        {
            ActionData action = ActionManager.actionData;
            int sampleCount = (int)action.totalFrame + 1;
            Rect rect = new Rect(0, y, 20, 15);
            for(int i = 0; i < sampleCount; i++)
            {
                rect.x = kTimeLineViewXOffset + i * kFrameWidth - 7;
                if(i % 5 == 0)
                {
                    Color c = GUI.color;
                    GUI.color = i % 10 == 0 ? Color.yellow : GUI.color;
                    GUI.Label(rect, i.ToString(), styles.textSmall);
                    GUI.color = c;
                }
            }
            y += 15;
        }

        void GUI_Slider( ref float y)
        {
            ActionData action = ActionManager.actionData;
            Rect rect = new Rect(kTimeLineViewXOffset - 4, y, action.totalFrame * kFrameWidth + 8, 15);
            float t = GUI.HorizontalSlider(rect,action.curAnimTimeNormal, 0, 1);
            if(t != action.curAnimTimeNormal)
            {
                if(ActionManager.IsPlay)
                    ActionManager.Pause();
                action.curAnimTimeNormal = t;
            }

            if(ActionManager.IsPlay)
            {
                this.Repaint();
            }

            y += 20;
        }

        void GUI_Grid(ref float y)
        {
            ActionData action = ActionManager.actionData;
            int sampleCount = (int)action.totalFrame + 1;

            Rect bgRect = new Rect(kTimeLineViewXOffset, y, action.totalFrame * kFrameWidth, ActionManager.kMaxEventsPerFrame * kFrameHeight);
            GUI.Box(bgRect, "");

            ui.defaultUIMaterail.SetPass(0);
            GL.PushMatrix();
            GL.LoadPixelMatrix();
            bool bWin = Application.platform == RuntimePlatform.WindowsEditor;
            if (bWin)
                GL.Begin(GL.QUADS);
            else
                GL.Begin(GL.LINES);
            Color lineColor = new Color(0.3f, 0.3f, 0.3f);
            Color lineColor2 = new Color(0.5f, 0.5f, 0.5f);
            for (int i = 0; i < ActionManager.kMaxEventsPerFrame + 1; i++)
            {
                ui.DrawHorizontalLineFast(y + i * kFrameHeight, kTimeLineViewXOffset, kTimeLineViewXOffset + action.totalFrame * kFrameWidth, lineColor);
            }
            for(int i = 0; i <= sampleCount; ++i)
            {
                Color c = i % 5 == 0 ? lineColor2 : lineColor;
                float x = kTimeLineViewXOffset + i * kFrameWidth;
                x = Mathf.Clamp(x, kTimeLineViewXOffset, kTimeLineViewXOffset + action.totalFrame * kFrameWidth);
                ui.DrawVerticalLineFast(x, y, y + ActionManager.kMaxEventsPerFrame * kFrameHeight, c);
            }

            ui.DrawVerticalLineFast(kTimeLineViewXOffset + bgRect.width * action.curAnimTimeNormal, y, y + ActionManager.kMaxEventsPerFrame * kFrameHeight, Color.red);

            GL.PopMatrix();
            GL.End();

            y += ActionManager.kMaxEventsPerFrame * kFrameHeight;
        }

        void GUI_Events(ref float y)
        {

        }

    }

}