/*
 * Copyright (c) 2015-present, Horcrux.
 * All rights reserved.
 *
 * This source code is licensed under the MIT-style license found in the
 * LICENSE file in the root directory of this source tree.
 */

package com.horcrux.svg;

import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;
import android.os.Build;
import android.view.View;
import com.facebook.react.bridge.Dynamic;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.ReadableType;
import java.util.ArrayList;
import javax.annotation.Nullable;

@SuppressLint("ViewConstructor")
class GroupView extends RenderableView {
  @Nullable ReadableMap mFont;
  private GlyphContext mGlyphContext;
  private Bitmap mLayerBitmap;
  private Canvas mLayerCanvas;
  private final Paint mLayerPaint;

  public GroupView(ReactContext reactContext) {
    super(reactContext);
    mLayerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  }

  public void setFont(Dynamic dynamic) {
    if (dynamic.getType() == ReadableType.Map) {
      mFont = dynamic.asMap();
    } else {
      mFont = null;
    }
    invalidate();
  }

  public void setFont(@Nullable ReadableMap font) {
    mFont = font;
    invalidate();
  }

  void setupGlyphContext(Canvas canvas) {
    RectF clipBounds = new RectF(canvas.getClipBounds());
    if (mMatrix != null) {
      mMatrix.mapRect(clipBounds);
    }
    if (mTransform != null) {
      mTransform.mapRect(clipBounds);
    }
    mGlyphContext = new GlyphContext(mScale, clipBounds.width(), clipBounds.height());
  }

  GlyphContext getGlyphContext() {
    return mGlyphContext;
  }

  private static <T> T requireNonNull(T obj) {
    if (obj == null) throw new NullPointerException();
    return obj;
  }

  GlyphContext getTextRootGlyphContext() {
    return requireNonNull(getTextRoot()).getGlyphContext();
  }

  void pushGlyphContext() {
    getTextRootGlyphContext().pushContext(this, mFont);
  }

  void popGlyphContext() {
    getTextRootGlyphContext().popContext();
  }

  void draw(final Canvas canvas, final Paint paint, final float opacity) {
    setupGlyphContext(canvas);
    clip(canvas, paint);
    drawGroup(canvas, paint, opacity);
    renderMarkers(canvas, paint, opacity);
  }

  void drawGroup(final Canvas canvas, final Paint paint, final float opacity) {
    pushGlyphContext();
    final SvgView svg = getSvgView();
    final GroupView self = this;
    final RectF groupRect = new RectF();

    if (mOpacity != 1) {
      if (mLayerBitmap == null) {
        mLayerBitmap =
            Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888);
        mLayerCanvas = new Canvas(mLayerBitmap);
      } else {
        mLayerBitmap.recycle();
        mLayerBitmap =
            Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888);
        mLayerCanvas.setBitmap(mLayerBitmap);
      }
      // Copy current matrix from original canvas
      mLayerCanvas.save();
      mLayerCanvas.setMatrix(canvas.getMatrix());
    } else {
      mLayerCanvas = canvas;
    }

    elements = new ArrayList<>();
    for (int i = 0; i < getChildCount(); i++) {
      View child = getChildAt(i);
      if (child instanceof MaskView) {
        continue;
      }
      if (child instanceof VirtualView) {
        VirtualView node = ((VirtualView) child);
        if ("none".equals(node.mDisplay)) {
          continue;
        }
        if (node instanceof RenderableView) {
          ((RenderableView) node).mergeProperties(self);
        }

        int count = node.saveAndSetupCanvas(mLayerCanvas, mCTM);
        node.render(mLayerCanvas, paint, opacity);
        RectF r = node.getClientRect();

        if (r != null) {
          groupRect.union(r);
        }

        node.restoreCanvas(mLayerCanvas, count);

        if (node instanceof RenderableView) {
          ((RenderableView) node).resetProperties();
        }

        if (node.isResponsible()) {
          svg.enableTouchEvents();
        }

        if (node.elements != null) {
          elements.addAll(node.elements);
        }

      } else if (child instanceof SvgView) {
        SvgView svgView = (SvgView) child;
        svgView.drawChildren(canvas);
        if (svgView.isResponsible()) {
          svg.enableTouchEvents();
        }
      }
    }

    if (mOpacity != 1) {
      // Restore copied canvas and temporary reset original canvas matrix to draw bitmap 1:1
      mLayerCanvas.restore();
      int saveCount = canvas.save();
      canvas.setMatrix(null);
      mLayerPaint.setAlpha((int) (mOpacity * 255));
      canvas.drawBitmap(mLayerBitmap, 0, 0, mLayerPaint);
      canvas.restoreToCount(saveCount);
    }
    this.setClientRect(groupRect);
    popGlyphContext();
  }

  void drawPath(Canvas canvas, Paint paint, float opacity) {
    super.draw(canvas, paint, opacity);
  }

  @Override
  Path getPath(final Canvas canvas, final Paint paint) {
    if (mPath != null) {
      return mPath;
    }
    mPath = new Path();

    for (int i = 0; i < getChildCount(); i++) {
      View node = getChildAt(i);
      if (node instanceof MaskView) {
        continue;
      }
      if (node instanceof VirtualView) {
        VirtualView n = (VirtualView) node;
        Matrix transform = n.mMatrix;
        mPath.addPath(n.getPath(canvas, paint), transform);
      }
    }

    return mPath;
  }

  Path getPath(final Canvas canvas, final Paint paint, final Region.Op op) {
    final Path path = new Path();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      final Path.Op pop = Path.Op.valueOf(op.name());
      for (int i = 0; i < getChildCount(); i++) {
        View node = getChildAt(i);
        if (node instanceof MaskView) {
          continue;
        }
        if (node instanceof VirtualView) {
          VirtualView n = (VirtualView) node;
          Matrix transform = n.mMatrix;
          Path p2;
          if (n instanceof GroupView) {
            p2 = ((GroupView) n).getPath(canvas, paint, op);
          } else {
            p2 = n.getPath(canvas, paint);
          }
          p2.transform(transform);
          path.op(p2, pop);
        }
      }
    } else {
      Rect clipBounds = canvas.getClipBounds();
      final Region bounds = new Region(clipBounds);
      final Region r = new Region();
      for (int i = 0; i < getChildCount(); i++) {
        View node = getChildAt(i);
        if (node instanceof MaskView) {
          continue;
        }
        if (node instanceof VirtualView) {
          VirtualView n = (VirtualView) node;
          Matrix transform = n.mMatrix;
          Path p2;
          if (n instanceof GroupView) {
            p2 = ((GroupView) n).getPath(canvas, paint, op);
          } else {
            p2 = n.getPath(canvas, paint);
          }
          if (transform != null) {
            p2.transform(transform);
          }
          Region r2 = new Region();
          r2.setPath(p2, bounds);
          r.op(r2, op);
        }
      }
      path.addPath(r.getBoundaryPath());
    }

    return path;
  }

  @Override
  int hitTest(final float[] src) {
    if (!mInvertible || !mTransformInvertible) {
      return -1;
    }

    float[] dst = new float[2];
    mInvMatrix.mapPoints(dst, src);
    mInvTransform.mapPoints(dst);

    int x = Math.round(dst[0]);
    int y = Math.round(dst[1]);

    Path clipPath = getClipPath();
    if (clipPath != null) {
      if (mClipRegionPath != clipPath) {
        mClipRegionPath = clipPath;
        mClipBounds = new RectF();
        clipPath.computeBounds(mClipBounds, true);
        mClipRegion = getRegion(clipPath, mClipBounds);
      }
      if (!mClipRegion.contains(x, y)) {
        return -1;
      }
    }

    for (int i = getChildCount() - 1; i >= 0; i--) {
      View child = getChildAt(i);
      if (child instanceof VirtualView) {
        if (child instanceof MaskView) {
          continue;
        }

        VirtualView node = (VirtualView) child;

        int hitChild = node.hitTest(dst);
        if (hitChild != -1) {
          return (node.isResponsible() || hitChild != child.getId()) ? hitChild : getId();
        }
      } else if (child instanceof SvgView) {
        SvgView node = (SvgView) child;

        int hitChild = node.reactTagForTouch(dst[0], dst[1]);
        if (hitChild != child.getId()) {
          return hitChild;
        }
      }
    }

    return -1;
  }

  void saveDefinition() {
    if (mName != null) {
      getSvgView().defineTemplate(this, mName);
    }

    for (int i = 0; i < getChildCount(); i++) {
      View node = getChildAt(i);
      if (node instanceof VirtualView) {
        ((VirtualView) node).saveDefinition();
      }
    }
  }

  @Override
  void resetProperties() {
    for (int i = 0; i < getChildCount(); i++) {
      View node = getChildAt(i);
      if (node instanceof RenderableView) {
        ((RenderableView) node).resetProperties();
      }
    }
  }
}
