/* eslint no-magic-numbers: ["error", { "ignore": [2] }] */

import { StrictStyleOptions } from 'botframework-webchat-api';

export default function createBasicTranscriptStyleSet({
  paddingRegular,
  primaryFont,
  transcriptActivityVisualKeyboardIndicatorColor,
  transcriptActivityVisualKeyboardIndicatorStyle,
  transcriptActivityVisualKeyboardIndicatorWidth,
  transcriptTerminatorBackgroundColor,
  transcriptTerminatorBorderRadius,
  transcriptTerminatorColor,
  transcriptTerminatorFontSize,
  transcriptVisualKeyboardIndicatorColor,
  transcriptVisualKeyboardIndicatorStyle,
  transcriptVisualKeyboardIndicatorWidth
}: StrictStyleOptions) {
  return {
    '&.webchat__basic-transcript': {
      '&:focus': {
        outline: 0,

        '& .webchat__basic-transcript__activity-indicator.webchat__basic-transcript__activity-indicator--focus': {
          borderColor: transcriptActivityVisualKeyboardIndicatorColor,
          borderStyle: transcriptActivityVisualKeyboardIndicatorStyle,
          borderWidth: transcriptActivityVisualKeyboardIndicatorWidth,
          boxSizing: 'border-box',
          height: `calc(100% - ${paddingRegular / 2}px)`,
          left: 0,
          marginBottom: 0,
          marginLeft: paddingRegular / 2,
          marginRight: paddingRegular / 2,
          marginTop: 0,
          pointerEvents: 'none',
          position: 'absolute',
          top: 0,
          width: `calc(100% - ${paddingRegular}px)`
        }
      },

      '&:focus-visible .webchat__basic-transcript__focus-indicator, .webchat__basic-transcript__terminator:focus-visible + .webchat__basic-transcript__focus-indicator':
        {
          height: '100%',
          borderColor: transcriptVisualKeyboardIndicatorColor,
          borderStyle: transcriptVisualKeyboardIndicatorStyle,
          borderWidth: transcriptVisualKeyboardIndicatorWidth,
          boxSizing: 'border-box',
          pointerEvents: 'none',
          position: 'absolute',
          top: 0,
          width: '100%'
        },

      '& .webchat__basic-transcript__activity': {
        paddingTop: paddingRegular / 2,
        position: 'relative',

        '&:first-child': {
          marginTop: paddingRegular / 2
        },

        '&:not(:first-child)': {
          marginTop: -paddingRegular / 2
        }
      },

      // When the activity is focused as active descendant, `scrollIntoView()` will scroll this invisible <div> into view.
      '& .webchat__basic-transcript__activity-active-descendant': {
        height: '100%',
        left: 0,
        marginTop: -paddingRegular / 2,
        paddingBottom: paddingRegular / 2,
        // The bounding box is expanded to both top and bottom to scroll focus indicator into view.
        // We should ignore clicks to make sure this expansion don't register click as focus.
        // Otherwise, when clicking on the very bottom edge of the activity, it will focus on next activity instead.
        pointerEvents: 'none',
        position: 'absolute',
        top: 0,
        width: '100%'
      },

      '& .webchat__basic-transcript__activity-body:not(:empty)': {
        paddingBottom: paddingRegular
      },

      '& .webchat__basic-transcript__terminator': {
        bottom: 0,
        height: 0,
        outline: 0,
        position: 'relative',
        width: '100%'
      },

      '& .webchat__basic-transcript__terminator-body': {
        bottom: 0,
        display: 'flex',
        justifyContent: 'center',
        position: 'absolute',
        width: '100%'
      },

      '& .webchat__basic-transcript__terminator:not(:focus) .webchat__basic-transcript__terminator-body': {
        display: 'none'
      },

      '& .webchat__basic-transcript__terminator-text': {
        backgroundColor: transcriptTerminatorBackgroundColor,
        borderRadius: transcriptTerminatorBorderRadius,
        color: transcriptTerminatorColor,
        fontFamily: primaryFont,
        fontSize: transcriptTerminatorFontSize,
        margin: paddingRegular / 2,
        padding: paddingRegular / 2
      }
    }
  };
}