import { Tools, PerfCounter } from "../Misc/tools";
import { Observer } from "../Misc/observable";
import { Nullable } from "../types";
import { Camera } from "../Cameras/camera";
import { Scene, IDisposable } from "../scene";
import { _TimeToken } from "../Instrumentation/timeToken";
import { _DepthCullingState, _StencilState, _AlphaState } from "../States/index";
/**
 * This class can be used to get instrumentation data from a Babylon engine
 * @see http://doc.babylonjs.com/how_to/optimizing_your_scene#sceneinstrumentation
 */
export class SceneInstrumentation implements IDisposable {
    private _captureActiveMeshesEvaluationTime = false;
    private _activeMeshesEvaluationTime = new PerfCounter();

    private _captureRenderTargetsRenderTime = false;
    private _renderTargetsRenderTime = new PerfCounter();

    private _captureFrameTime = false;
    private _frameTime = new PerfCounter();

    private _captureRenderTime = false;
    private _renderTime = new PerfCounter();

    private _captureInterFrameTime = false;
    private _interFrameTime = new PerfCounter();

    private _captureParticlesRenderTime = false;
    private _particlesRenderTime = new PerfCounter();

    private _captureSpritesRenderTime = false;
    private _spritesRenderTime = new PerfCounter();

    private _capturePhysicsTime = false;
    private _physicsTime = new PerfCounter();

    private _captureAnimationsTime = false;
    private _animationsTime = new PerfCounter();

    private _captureCameraRenderTime = false;
    private _cameraRenderTime = new PerfCounter();

    // Observers
    private _onBeforeActiveMeshesEvaluationObserver: Nullable<Observer<Scene>> = null;
    private _onAfterActiveMeshesEvaluationObserver: Nullable<Observer<Scene>> = null;
    private _onBeforeRenderTargetsRenderObserver: Nullable<Observer<Scene>> = null;
    private _onAfterRenderTargetsRenderObserver: Nullable<Observer<Scene>> = null;

    private _onAfterRenderObserver: Nullable<Observer<Scene>> = null;

    private _onBeforeDrawPhaseObserver: Nullable<Observer<Scene>> = null;
    private _onAfterDrawPhaseObserver: Nullable<Observer<Scene>> = null;

    private _onBeforeAnimationsObserver: Nullable<Observer<Scene>> = null;

    private _onBeforeParticlesRenderingObserver: Nullable<Observer<Scene>> = null;
    private _onAfterParticlesRenderingObserver: Nullable<Observer<Scene>> = null;

    private _onBeforeSpritesRenderingObserver: Nullable<Observer<Scene>> = null;
    private _onAfterSpritesRenderingObserver: Nullable<Observer<Scene>> = null;

    private _onBeforePhysicsObserver: Nullable<Observer<Scene>> = null;
    private _onAfterPhysicsObserver: Nullable<Observer<Scene>> = null;

    private _onAfterAnimationsObserver: Nullable<Observer<Scene>> = null;

    private _onBeforeCameraRenderObserver: Nullable<Observer<Camera>> = null;
    private _onAfterCameraRenderObserver: Nullable<Observer<Camera>> = null;

    // Properties
    /**
     * Gets the perf counter used for active meshes evaluation time
     */
    public get activeMeshesEvaluationTimeCounter(): PerfCounter {
        return this._activeMeshesEvaluationTime;
    }

    /**
     * Gets the active meshes evaluation time capture status
     */
    public get captureActiveMeshesEvaluationTime(): boolean {
        return this._captureActiveMeshesEvaluationTime;
    }

    /**
     * Enable or disable the active meshes evaluation time capture
     */
    public set captureActiveMeshesEvaluationTime(value: boolean) {
        if (value === this._captureActiveMeshesEvaluationTime) {
            return;
        }

        this._captureActiveMeshesEvaluationTime = value;

        if (value) {
            this._onBeforeActiveMeshesEvaluationObserver = this.scene.onBeforeActiveMeshesEvaluationObservable.add(() => {
                Tools.StartPerformanceCounter("Active meshes evaluation");
                this._activeMeshesEvaluationTime.beginMonitoring();
            });

            this._onAfterActiveMeshesEvaluationObserver = this.scene.onAfterActiveMeshesEvaluationObservable.add(() => {
                Tools.EndPerformanceCounter("Active meshes evaluation");
                this._activeMeshesEvaluationTime.endMonitoring();
            });
        } else {
            this.scene.onBeforeActiveMeshesEvaluationObservable.remove(this._onBeforeActiveMeshesEvaluationObserver);
            this._onBeforeActiveMeshesEvaluationObserver = null;

            this.scene.onAfterActiveMeshesEvaluationObservable.remove(this._onAfterActiveMeshesEvaluationObserver);
            this._onAfterActiveMeshesEvaluationObserver = null;
        }
    }

    /**
     * Gets the perf counter used for render targets render time
     */
    public get renderTargetsRenderTimeCounter(): PerfCounter {
        return this._renderTargetsRenderTime;
    }

    /**
     * Gets the render targets render time capture status
     */
    public get captureRenderTargetsRenderTime(): boolean {
        return this._captureRenderTargetsRenderTime;
    }

    /**
     * Enable or disable the render targets render time capture
     */
    public set captureRenderTargetsRenderTime(value: boolean) {
        if (value === this._captureRenderTargetsRenderTime) {
            return;
        }

        this._captureRenderTargetsRenderTime = value;

        if (value) {
            this._onBeforeRenderTargetsRenderObserver = this.scene.onBeforeRenderTargetsRenderObservable.add(() => {
                Tools.StartPerformanceCounter("Render targets rendering");
                this._renderTargetsRenderTime.beginMonitoring();
            });

            this._onAfterRenderTargetsRenderObserver = this.scene.onAfterRenderTargetsRenderObservable.add(() => {
                Tools.EndPerformanceCounter("Render targets rendering");
                this._renderTargetsRenderTime.endMonitoring(false);
            });
        } else {
            this.scene.onBeforeRenderTargetsRenderObservable.remove(this._onBeforeRenderTargetsRenderObserver);
            this._onBeforeRenderTargetsRenderObserver = null;

            this.scene.onAfterRenderTargetsRenderObservable.remove(this._onAfterRenderTargetsRenderObserver);
            this._onAfterRenderTargetsRenderObserver = null;
        }
    }

    /**
     * Gets the perf counter used for particles render time
     */
    public get particlesRenderTimeCounter(): PerfCounter {
        return this._particlesRenderTime;
    }

    /**
     * Gets the particles render time capture status
     */
    public get captureParticlesRenderTime(): boolean {
        return this._captureParticlesRenderTime;
    }

    /**
     * Enable or disable the particles render time capture
     */
    public set captureParticlesRenderTime(value: boolean) {
        if (value === this._captureParticlesRenderTime) {
            return;
        }

        this._captureParticlesRenderTime = value;

        if (value) {
            this._onBeforeParticlesRenderingObserver = this.scene.onBeforeParticlesRenderingObservable.add(() => {
                Tools.StartPerformanceCounter("Particles");
                this._particlesRenderTime.beginMonitoring();
            });

            this._onAfterParticlesRenderingObserver = this.scene.onAfterParticlesRenderingObservable.add(() => {
                Tools.EndPerformanceCounter("Particles");
                this._particlesRenderTime.endMonitoring(false);
            });
        } else {
            this.scene.onBeforeParticlesRenderingObservable.remove(this._onBeforeParticlesRenderingObserver);
            this._onBeforeParticlesRenderingObserver = null;

            this.scene.onAfterParticlesRenderingObservable.remove(this._onAfterParticlesRenderingObserver);
            this._onAfterParticlesRenderingObserver = null;
        }
    }

    /**
     * Gets the perf counter used for sprites render time
     */
    public get spritesRenderTimeCounter(): PerfCounter {
        return this._spritesRenderTime;
    }

    /**
     * Gets the sprites render time capture status
     */
    public get captureSpritesRenderTime(): boolean {
        return this._captureSpritesRenderTime;
    }

    /**
     * Enable or disable the sprites render time capture
     */
    public set captureSpritesRenderTime(value: boolean) {
        if (value === this._captureSpritesRenderTime) {
            return;
        }

        this._captureSpritesRenderTime = value;

        if (!this.scene.spriteManagers) {
            return;
        }

        if (value) {
            this._onBeforeSpritesRenderingObserver = this.scene.onBeforeSpritesRenderingObservable.add(() => {
                Tools.StartPerformanceCounter("Sprites");
                this._spritesRenderTime.beginMonitoring();
            });

            this._onAfterSpritesRenderingObserver = this.scene.onAfterSpritesRenderingObservable.add(() => {
                Tools.EndPerformanceCounter("Sprites");
                this._spritesRenderTime.endMonitoring(false);
            });
        } else {
            this.scene.onBeforeSpritesRenderingObservable.remove(this._onBeforeSpritesRenderingObserver);
            this._onBeforeSpritesRenderingObserver = null;

            this.scene.onAfterSpritesRenderingObservable.remove(this._onAfterSpritesRenderingObserver);
            this._onAfterSpritesRenderingObserver = null;
        }
    }

    /**
     * Gets the perf counter used for physics time
     */
    public get physicsTimeCounter(): PerfCounter {
        return this._physicsTime;
    }

    /**
     * Gets the physics time capture status
     */
    public get capturePhysicsTime(): boolean {
        return this._capturePhysicsTime;
    }

    /**
     * Enable or disable the physics time capture
     */
    public set capturePhysicsTime(value: boolean) {
        if (value === this._capturePhysicsTime) {
            return;
        }

        if (!this.scene.onBeforePhysicsObservable) {
            return;
        }

        this._capturePhysicsTime = value;

        if (value) {
            this._onBeforePhysicsObserver = this.scene.onBeforePhysicsObservable.add(() => {
                Tools.StartPerformanceCounter("Physics");
                this._physicsTime.beginMonitoring();
            });

            this._onAfterPhysicsObserver = this.scene.onAfterPhysicsObservable.add(() => {
                Tools.EndPerformanceCounter("Physics");
                this._physicsTime.endMonitoring();
            });
        } else {
            this.scene.onBeforePhysicsObservable.remove(this._onBeforePhysicsObserver);
            this._onBeforePhysicsObserver = null;

            this.scene.onAfterPhysicsObservable.remove(this._onAfterPhysicsObserver);
            this._onAfterPhysicsObserver = null;
        }
    }

    /**
     * Gets the perf counter used for animations time
     */
    public get animationsTimeCounter(): PerfCounter {
        return this._animationsTime;
    }

    /**
     * Gets the animations time capture status
     */
    public get captureAnimationsTime(): boolean {
        return this._captureAnimationsTime;
    }

    /**
     * Enable or disable the animations time capture
     */
    public set captureAnimationsTime(value: boolean) {
        if (value === this._captureAnimationsTime) {
            return;
        }

        this._captureAnimationsTime = value;

        if (value) {
            this._onAfterAnimationsObserver = this.scene.onAfterAnimationsObservable.add(() => {
                this._animationsTime.endMonitoring();
            });
        } else {
            this.scene.onAfterAnimationsObservable.remove(this._onAfterAnimationsObserver);
            this._onAfterAnimationsObserver = null;
        }
    }

    /**
     * Gets the perf counter used for frame time capture
     */
    public get frameTimeCounter(): PerfCounter {
        return this._frameTime;
    }

    /**
     * Gets the frame time capture status
     */
    public get captureFrameTime(): boolean {
        return this._captureFrameTime;
    }

    /**
     * Enable or disable the frame time capture
     */
    public set captureFrameTime(value: boolean) {
        this._captureFrameTime = value;
    }

    /**
     * Gets the perf counter used for inter-frames time capture
     */
    public get interFrameTimeCounter(): PerfCounter {
        return this._interFrameTime;
    }

    /**
     * Gets the inter-frames time capture status
     */
    public get captureInterFrameTime(): boolean {
        return this._captureInterFrameTime;
    }

    /**
     * Enable or disable the inter-frames time capture
     */
    public set captureInterFrameTime(value: boolean) {
        this._captureInterFrameTime = value;
    }

    /**
     * Gets the perf counter used for render time capture
     */
    public get renderTimeCounter(): PerfCounter {
        return this._renderTime;
    }

    /**
     * Gets the render time capture status
     */
    public get captureRenderTime(): boolean {
        return this._captureRenderTime;
    }

    /**
     * Enable or disable the render time capture
     */
    public set captureRenderTime(value: boolean) {
        if (value === this._captureRenderTime) {
            return;
        }

        this._captureRenderTime = value;

        if (value) {
            this._onBeforeDrawPhaseObserver = this.scene.onBeforeDrawPhaseObservable.add(() => {
                this._renderTime.beginMonitoring();
                Tools.StartPerformanceCounter("Main render");
            });

            this._onAfterDrawPhaseObserver = this.scene.onAfterDrawPhaseObservable.add(() => {
                this._renderTime.endMonitoring(false);
                Tools.EndPerformanceCounter("Main render");
            });
        } else {
            this.scene.onBeforeDrawPhaseObservable.remove(this._onBeforeDrawPhaseObserver);
            this._onBeforeDrawPhaseObserver = null;
            this.scene.onAfterDrawPhaseObservable.remove(this._onAfterDrawPhaseObserver);
            this._onAfterDrawPhaseObserver = null;
        }
    }

    /**
     * Gets the perf counter used for camera render time capture
     */
    public get cameraRenderTimeCounter(): PerfCounter {
        return this._cameraRenderTime;
    }

    /**
     * Gets the camera render time capture status
     */
    public get captureCameraRenderTime(): boolean {
        return this._captureCameraRenderTime;
    }

    /**
     * Enable or disable the camera render time capture
     */
    public set captureCameraRenderTime(value: boolean) {
        if (value === this._captureCameraRenderTime) {
            return;
        }

        this._captureCameraRenderTime = value;

        if (value) {
            this._onBeforeCameraRenderObserver = this.scene.onBeforeCameraRenderObservable.add((camera) => {
                this._cameraRenderTime.beginMonitoring();
                Tools.StartPerformanceCounter(`Rendering camera ${camera.name}`);
            });

            this._onAfterCameraRenderObserver = this.scene.onAfterCameraRenderObservable.add((camera) => {
                this._cameraRenderTime.endMonitoring(false);
                Tools.EndPerformanceCounter(`Rendering camera ${camera.name}`);
            });
        } else {
            this.scene.onBeforeCameraRenderObservable.remove(this._onBeforeCameraRenderObserver);
            this._onBeforeCameraRenderObserver = null;
            this.scene.onAfterCameraRenderObservable.remove(this._onAfterCameraRenderObserver);
            this._onAfterCameraRenderObserver = null;
        }
    }

    /**
     * Gets the perf counter used for draw calls
     */
    public get drawCallsCounter(): PerfCounter {
        return this.scene.getEngine()._drawCalls;
    }

    /**
     * Instantiates a new scene instrumentation.
     * This class can be used to get instrumentation data from a Babylon engine
     * @see http://doc.babylonjs.com/how_to/optimizing_your_scene#sceneinstrumentation
     * @param scene Defines the scene to instrument
     */
    public constructor(
        /**
         * Defines the scene to instrument
         */
        public scene: Scene) {
        // Before render
        this._onBeforeAnimationsObserver = scene.onBeforeAnimationsObservable.add(() => {
            if (this._captureActiveMeshesEvaluationTime) {
                this._activeMeshesEvaluationTime.fetchNewFrame();
            }

            if (this._captureRenderTargetsRenderTime) {
                this._renderTargetsRenderTime.fetchNewFrame();
            }

            if (this._captureFrameTime) {
                Tools.StartPerformanceCounter("Scene rendering");
                this._frameTime.beginMonitoring();
            }

            if (this._captureInterFrameTime) {
                this._interFrameTime.endMonitoring();
            }

            if (this._captureParticlesRenderTime) {
                this._particlesRenderTime.fetchNewFrame();
            }

            if (this._captureSpritesRenderTime) {
                this._spritesRenderTime.fetchNewFrame();
            }

            if (this._captureAnimationsTime) {
                this._animationsTime.beginMonitoring();
            }

            this.scene.getEngine()._drawCalls.fetchNewFrame();
        });

        // After render
        this._onAfterRenderObserver = scene.onAfterRenderObservable.add(() => {
            if (this._captureFrameTime) {
                Tools.EndPerformanceCounter("Scene rendering");
                this._frameTime.endMonitoring();
            }

            if (this._captureRenderTime) {
                this._renderTime.endMonitoring(false);
            }

            if (this._captureInterFrameTime) {
                this._interFrameTime.beginMonitoring();
            }
        });
    }

    /**
     * Dispose and release associated resources.
     */
    public dispose() {
        this.scene.onAfterRenderObservable.remove(this._onAfterRenderObserver);
        this._onAfterRenderObserver = null;

        this.scene.onBeforeActiveMeshesEvaluationObservable.remove(this._onBeforeActiveMeshesEvaluationObserver);
        this._onBeforeActiveMeshesEvaluationObserver = null;

        this.scene.onAfterActiveMeshesEvaluationObservable.remove(this._onAfterActiveMeshesEvaluationObserver);
        this._onAfterActiveMeshesEvaluationObserver = null;

        this.scene.onBeforeRenderTargetsRenderObservable.remove(this._onBeforeRenderTargetsRenderObserver);
        this._onBeforeRenderTargetsRenderObserver = null;

        this.scene.onAfterRenderTargetsRenderObservable.remove(this._onAfterRenderTargetsRenderObserver);
        this._onAfterRenderTargetsRenderObserver = null;

        this.scene.onBeforeAnimationsObservable.remove(this._onBeforeAnimationsObserver);
        this._onBeforeAnimationsObserver = null;

        this.scene.onBeforeParticlesRenderingObservable.remove(this._onBeforeParticlesRenderingObserver);
        this._onBeforeParticlesRenderingObserver = null;

        this.scene.onAfterParticlesRenderingObservable.remove(this._onAfterParticlesRenderingObserver);
        this._onAfterParticlesRenderingObserver = null;

        if (this._onBeforeSpritesRenderingObserver) {
            this.scene.onBeforeSpritesRenderingObservable.remove(this._onBeforeSpritesRenderingObserver);
            this._onBeforeSpritesRenderingObserver = null;
        }

        if (this._onAfterSpritesRenderingObserver) {
            this.scene.onAfterSpritesRenderingObservable.remove(this._onAfterSpritesRenderingObserver);
            this._onAfterSpritesRenderingObserver = null;
        }

        this.scene.onBeforeDrawPhaseObservable.remove(this._onBeforeDrawPhaseObserver);
        this._onBeforeDrawPhaseObserver = null;

        this.scene.onAfterDrawPhaseObservable.remove(this._onAfterDrawPhaseObserver);
        this._onAfterDrawPhaseObserver = null;

        if (this._onBeforePhysicsObserver) {
            this.scene.onBeforePhysicsObservable.remove(this._onBeforePhysicsObserver);
            this._onBeforePhysicsObserver = null;
        }

        if (this._onAfterPhysicsObserver) {
            this.scene.onAfterPhysicsObservable.remove(this._onAfterPhysicsObserver);
            this._onAfterPhysicsObserver = null;
        }

        this.scene.onAfterAnimationsObservable.remove(this._onAfterAnimationsObserver);
        this._onAfterAnimationsObserver = null;

        this.scene.onBeforeCameraRenderObservable.remove(this._onBeforeCameraRenderObserver);
        this._onBeforeCameraRenderObserver = null;

        this.scene.onAfterCameraRenderObservable.remove(this._onAfterCameraRenderObserver);
        this._onAfterCameraRenderObserver = null;

        (<any>this.scene) = null;
    }
}