package biz.laenger.android.vpbs;

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.os.Bundle;

import androidx.annotation.LayoutRes;
import androidx.annotation.NonNull;
import androidx.annotation.StyleRes;
import androidx.appcompat.app.AppCompatDialog;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import androidx.core.view.AccessibilityDelegateCompat;
import androidx.core.view.ViewCompat;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.FrameLayout;

public class ViewPagerBottomSheetDialog extends AppCompatDialog {

    private ViewPagerBottomSheetBehavior<FrameLayout> mBehavior;

    boolean mCancelable = true;
    private boolean mCanceledOnTouchOutside = true;
    private boolean mCanceledOnTouchOutsideSet;

    public ViewPagerBottomSheetDialog(@NonNull Context context) {
        this(context, 0);
    }

    public ViewPagerBottomSheetDialog(@NonNull Context context, @StyleRes int theme) {
        super(context, getThemeResId(context, theme));
        // We hide the title bar for any style configuration. Otherwise, there will be a gap
        // above the bottom sheet when it is expanded.
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
    }

    protected ViewPagerBottomSheetDialog(@NonNull Context context, boolean cancelable,
            OnCancelListener cancelListener) {
        super(context, cancelable, cancelListener);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        mCancelable = cancelable;
    }

    @Override
    public void setContentView(@LayoutRes int layoutResId) {
        super.setContentView(wrapInBottomSheet(layoutResId, null, null));
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setLayout(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
    }

    @Override
    public void setContentView(View view) {
        super.setContentView(wrapInBottomSheet(0, view, null));
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        super.setContentView(wrapInBottomSheet(0, view, params));
    }

    @Override
    public void setCancelable(boolean cancelable) {
        super.setCancelable(cancelable);
        if (mCancelable != cancelable) {
            mCancelable = cancelable;
            if (mBehavior != null) {
                mBehavior.setHideable(cancelable);
            }
        }
    }

    @Override
    public void setCanceledOnTouchOutside(boolean cancel) {
        super.setCanceledOnTouchOutside(cancel);
        if (cancel && !mCancelable) {
            mCancelable = true;
        }
        mCanceledOnTouchOutside = cancel;
        mCanceledOnTouchOutsideSet = true;
    }

    private View wrapInBottomSheet(int layoutResId, View view, ViewGroup.LayoutParams params) {
        final CoordinatorLayout coordinator = (CoordinatorLayout) View.inflate(getContext(),
                R.layout.design_view_pager_bottom_sheet_dialog, null);
        if (layoutResId != 0 && view == null) {
            view = getLayoutInflater().inflate(layoutResId, coordinator, false);
        }
        FrameLayout bottomSheet = (FrameLayout) coordinator.findViewById(R.id.design_bottom_sheet);
        mBehavior = ViewPagerBottomSheetBehavior.from(bottomSheet);
        mBehavior.setBottomSheetCallback(mBottomSheetCallback);
        mBehavior.setHideable(mCancelable);
        if (params == null) {
            bottomSheet.addView(view);
        } else {
            bottomSheet.addView(view, params);
        }
        // We treat the CoordinatorLayout as outside the dialog though it is technically inside
        coordinator.findViewById(R.id.touch_outside).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mCancelable && isShowing() && shouldWindowCloseOnTouchOutside()) {
                    cancel();
                }
            }
        });
        // Handle accessibility events
        ViewCompat.setAccessibilityDelegate(bottomSheet, new AccessibilityDelegateCompat() {
            @Override
            public void onInitializeAccessibilityNodeInfo(View host,
                    AccessibilityNodeInfoCompat info) {
                super.onInitializeAccessibilityNodeInfo(host, info);
                if (mCancelable) {
                    info.addAction(AccessibilityNodeInfoCompat.ACTION_DISMISS);
                    info.setDismissable(true);
                } else {
                    info.setDismissable(false);
                }
            }

            @Override
            public boolean performAccessibilityAction(View host, int action, Bundle args) {
                if (action == AccessibilityNodeInfoCompat.ACTION_DISMISS && mCancelable) {
                    cancel();
                    return true;
                }
                return super.performAccessibilityAction(host, action, args);
            }
        });
        return coordinator;
    }

    boolean shouldWindowCloseOnTouchOutside() {
        if (!mCanceledOnTouchOutsideSet) {
            if (Build.VERSION.SDK_INT < 11) {
                mCanceledOnTouchOutside = true;
            } else {
                TypedArray a = getContext().obtainStyledAttributes(
                        new int[]{android.R.attr.windowCloseOnTouchOutside});
                mCanceledOnTouchOutside = a.getBoolean(0, true);
                a.recycle();
            }
            mCanceledOnTouchOutsideSet = true;
        }
        return mCanceledOnTouchOutside;
    }

    private static int getThemeResId(Context context, int themeId) {
        if (themeId == 0) {
            // If the provided theme is 0, then retrieve the dialogTheme from our theme
            TypedValue outValue = new TypedValue();
            if (context.getTheme().resolveAttribute(
                    R.attr.bottomSheetDialogTheme, outValue, true)) {
                themeId = outValue.resourceId;
            } else {
                // bottomSheetDialogTheme is not provided; we default to our light theme
                themeId = R.style.Theme_Design_Light_BottomSheetDialog;
            }
        }
        return themeId;
    }

    private ViewPagerBottomSheetBehavior.BottomSheetCallback mBottomSheetCallback
            = new ViewPagerBottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet,
                @ViewPagerBottomSheetBehavior.State int newState) {
            if (newState == ViewPagerBottomSheetBehavior.STATE_HIDDEN) {
                cancel();
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    };

}
