using System;
using System.Linq;
using RemoteTech.SimpleTypes;
using UnityEngine;
using KSP.UI;

namespace RemoteTech.UI {
    public class TimeWarpDecorator {
        /// <summary>
        /// Craped Timewarpobject from stock
        /// </summary>
        private TimeWarp mTimewarpObject;
        private UnityEngine.UI.Image mTimewarpImage;
        /// <summary>
        /// Delay-Text style
        /// </summary>
        private GUIStyle mTextStyle;

        /// <summary>
        /// Green Flightcomputer button
        /// </summary>
        private readonly GUIStyle mFlightButtonGreen;
        /// <summary>
        /// Red Flightcomputer button
        /// </summary>
        private readonly GUIStyle mFlightButtonRed;
        /// <summary>
        /// Yellow Flightcomputer button
        /// </summary>
        private readonly GUIStyle mFlightButtonYellow;
        /// <summary>
        /// Delay-Timer Background
        /// </summary>
        private readonly Texture2D mTexBackground;
        /// <summary>
        /// Activ Vessel
        /// </summary>
        private VesselSatellite mVessel { get { return RTCore.Instance.Satellites[FlightGlobals.ActiveVessel]; } }

        private String DisplayText {
            get {
                var vs = this.mVessel;
                if (vs == null) {
                    return "N/A";
                } else if (vs.HasLocalControl) {
                    return "Local Control";
                } else if (vs.Connections.Any()) {
                    if (RTSettings.Instance.EnableSignalDelay) {
                        return "D+ " + vs.Connections[0].Delay.ToString("F5") + "s";
                    } else {
                        return "Connected";
                    }
                }
                return "No Connection";
            }
        }

        /// <summary>
        /// Returns the Style of the Flightcomputer button by the connected status
        /// </summary>
        private GUIStyle ButtonStyle {
            get {
                var vs = this.mVessel;
                if (vs == null) {
                    return mFlightButtonRed;
                } else if (vs.HasLocalControl) {
                    return mFlightButtonYellow;
                } else if (vs.Connections.Any()) {
                    return mFlightButtonGreen;
                }
                return mFlightButtonRed;
            }
        }

        private Texture2D[,] fcTextures;

        private void saveFcTextures() {
            fcTextures = new Texture2D[3, 4];

            fcTextures[0, 0] = mFlightButtonGreen.normal.background;
            fcTextures[0, 1] = mFlightButtonGreen.hover.background;
            fcTextures[0, 2] = mFlightButtonGreen.active.background;
            fcTextures[0, 3] = mFlightButtonGreen.focused.background;

            fcTextures[1, 0] = mFlightButtonYellow.normal.background;
            fcTextures[1, 1] = mFlightButtonYellow.hover.background;
            fcTextures[1, 2] = mFlightButtonYellow.active.background;
            fcTextures[1, 3] = mFlightButtonYellow.focused.background;

            fcTextures[2, 0] = mFlightButtonRed.normal.background;
            fcTextures[2, 1] = mFlightButtonRed.hover.background;
            fcTextures[2, 2] = mFlightButtonRed.active.background;
            fcTextures[2, 3] = mFlightButtonRed.focused.background;
        }

        private void restoreFcTextures() {
            if (mFlightButtonGreen.normal.background == null || mFlightButtonYellow.normal.background == null || mFlightButtonRed.normal.background == null) {
                mFlightButtonGreen.normal.background = fcTextures[0, 0];
                mFlightButtonGreen.hover.background = fcTextures[0, 1];
                mFlightButtonGreen.active.background = fcTextures[0, 2];
                mFlightButtonGreen.onNormal.background = fcTextures[0, 2];
                mFlightButtonGreen.onHover.background = fcTextures[0, 2];
                mFlightButtonGreen.onActive.background = fcTextures[0, 2];
                mFlightButtonGreen.onFocused.background = fcTextures[0, 2];
                mFlightButtonGreen.focused.background = fcTextures[0, 3];

                mFlightButtonYellow.normal.background = fcTextures[1, 0];
                mFlightButtonYellow.hover.background = fcTextures[1, 1];
                mFlightButtonYellow.active.background = fcTextures[1, 2];
                mFlightButtonYellow.onNormal.background = fcTextures[1, 2];
                mFlightButtonYellow.onHover.background = fcTextures[1, 2];
                mFlightButtonYellow.onActive.background = fcTextures[1, 2];
                mFlightButtonYellow.onFocused.background = fcTextures[1, 2];
                mFlightButtonYellow.focused.background = fcTextures[1, 3];

                mFlightButtonRed.normal.background = fcTextures[2, 0];
                mFlightButtonRed.hover.background = fcTextures[2, 1];
                mFlightButtonRed.active.background = fcTextures[2, 2];
                mFlightButtonRed.onNormal.background = fcTextures[2, 2];
                mFlightButtonRed.onHover.background = fcTextures[2, 2];
                mFlightButtonRed.onActive.background = fcTextures[2, 2];
                mFlightButtonRed.onFocused.background = fcTextures[2, 2];
                mFlightButtonRed.focused.background = fcTextures[2, 3];
            }
        }

        public TimeWarpDecorator() {
            mFlightButtonGreen = GUITextureButtonFactory.CreateFromFilename("texFlightGreen.png", "texFlightGreenOver.png", "texFlightGreenDown.png", "texFlightGreenOver.png");
            mFlightButtonYellow = GUITextureButtonFactory.CreateFromFilename("texFlightYellow.png", "texFlightYellowOver.png", "texFlightYellowDown.png", "texFlightYellowOver.png");
            mFlightButtonRed = GUITextureButtonFactory.CreateFromFilename("texFlightRed.png", "texFlightRed.png", "texFlightRed.png", "texFlightRed.png");

            saveFcTextures();

            mFlightButtonGreen.fixedHeight = mFlightButtonGreen.fixedWidth = 0;
            mFlightButtonYellow.fixedHeight = mFlightButtonYellow.fixedWidth = 0;
            mFlightButtonRed.fixedHeight = mFlightButtonRed.fixedWidth = 0;
            mFlightButtonGreen.stretchHeight = mFlightButtonGreen.stretchWidth = true;
            mFlightButtonYellow.stretchHeight = mFlightButtonYellow.stretchWidth = true;
            mFlightButtonRed.stretchHeight = mFlightButtonRed.stretchWidth = true;

            // Crap timewarp object

            mTimewarpObject = TimeWarp.fetch;
            GameObject go = GameObject.Find("TimeQuadrant");
            if (go)
                mTimewarpImage = go.GetComponent<UnityEngine.UI.Image>();

            // objects on this scene?
            if (mTimewarpObject == null || mTimewarpObject.timeQuadrantTab == null) {
                // to skip the draw calls
                mTimewarpObject = null;
                return;
            }

            var text = mTimewarpObject.timeQuadrantTab.transform.FindChild("MET timer").GetComponent<ScreenSafeGUIText>();
            mTextStyle = new GUIStyle(text.textStyle);
            mTextStyle.fontSize = (int)(text.textSize * ScreenSafeUI.PixelRatio);

            // Put the draw function to the DrawQueue
            /*RenderingManager.AddToPostDrawQueue(0, Draw);*/
            //RTCore.Instance.OnGuiUpdate += Draw;

            // create the Background
            RTUtil.LoadImage(out mTexBackground, "TimeQuadrantFcStatus.png");
        }

        /// <summary>
        /// Draws the TimeQuadrantFcStatus.png, Delay time and the Flightcomputerbutton under the timewarp object
        /// </summary>
        public void Draw() {
            // no drawing without timewarp object
            if (mTimewarpObject == null)
                return;

            restoreFcTextures();

            var tr = mTimewarpImage.rectTransform.position;
            Vector2 screenCoord = UIMainCamera.Camera.WorldToScreenPoint(tr);

            // TODO: Might need to fix this also
            float scale = GameSettings.UI_SCALE;

            float topLeftTotimeQuadrant = (Screen.height - screenCoord.y + mTimewarpImage.preferredHeight - 1) * scale;
            float texBackgroundHeight = mTexBackground.height * 0.7f * scale;
            float texBackgroundWidth = (mTexBackground.width * 0.8111f) * scale;

            Rect delaytextPosition = new Rect((screenCoord.x + 12.0f) * scale, topLeftTotimeQuadrant, 50.0f * scale, 20.0f * scale);

            // calc the position under the timewarp object
            Rect pos = new Rect(screenCoord.x * scale,
                                topLeftTotimeQuadrant,
                                texBackgroundWidth, texBackgroundHeight);
            // draw the image
            GUI.DrawTexture(pos, mTexBackground);

            // draw the delay-text
            GUI.Label(delaytextPosition, DisplayText, mTextStyle);

            // draw the flightcomputer button to the right relativ to the delaytext position
            Rect btnPos = new Rect(pos.x + (125.0f * scale), topLeftTotimeQuadrant, 21.0f, 21.0f);

            // TODO: Fix this buttons icon, somehow it doesn't display but it still functions
            if (GUI.Button(btnPos, "", ButtonStyle)) {
                var satellite = RTCore.Instance.Satellites[FlightGlobals.ActiveVessel];
                if (satellite == null || satellite.SignalProcessor.FlightComputer == null) return;
                satellite.SignalProcessor.FlightComputer.Window.Show();
            }
        }
    }
}