/**
 * @ai-summary Post-capture crop tool with draggable handles
 * @ai-context Allows user to adjust crop area with touch/mouse, confirm or retake
 */

import React, { useCallback, useState } from 'react';
import { Box, IconButton, Button, Typography, CircularProgress } from '@mui/material';
import CheckIcon from '@mui/icons-material/Check';
import RefreshIcon from '@mui/icons-material/Refresh';
import ReplayIcon from '@mui/icons-material/Replay';
import SkipNextIcon from '@mui/icons-material/SkipNext';
import type { CropToolProps } from './types';
import { useImageCrop, type CropHandle } from './useImageCrop';

export const CropTool: React.FC<CropToolProps> = ({
  imageSrc,
  lockAspectRatio = false,
  aspectRatio,
  onConfirm,
  onReset,
  onRetake,
  onSkip,
}) => {
  const [isProcessing, setIsProcessing] = useState(false);

  const { cropArea, isDragging, resetCrop, executeCrop, handleDragStart } =
    useImageCrop({
      aspectRatio: lockAspectRatio ? aspectRatio : undefined,
    });

  const handleConfirm = useCallback(async () => {
    setIsProcessing(true);
    try {
      const croppedBlob = await executeCrop(imageSrc);
      onConfirm(croppedBlob);
    } catch (error) {
      console.error('Failed to crop image:', error);
      // On error, skip cropping and use original
      onSkip();
    } finally {
      setIsProcessing(false);
    }
  }, [executeCrop, imageSrc, onConfirm, onSkip]);

  const handleReset = useCallback(() => {
    resetCrop();
    onReset();
  }, [resetCrop, onReset]);

  return (
    <Box
      sx={{
        position: 'relative',
        width: '100%',
        height: '100%',
        backgroundColor: 'black',
        display: 'flex',
        flexDirection: 'column',
        overflow: 'hidden',
      }}
    >
      {/* Image with crop overlay */}
      <Box
        sx={{
          flex: 1,
          position: 'relative',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          overflow: 'hidden',
          p: 2,
        }}
      >
        <Box
          data-crop-container
          sx={{
            position: 'relative',
            maxWidth: '100%',
            maxHeight: '100%',
            userSelect: 'none',
            touchAction: isDragging ? 'none' : 'auto',
          }}
        >
          {/* Source image */}
          <img
            src={imageSrc}
            alt="Captured"
            style={{
              maxWidth: '100%',
              maxHeight: '100%',
              display: 'block',
            }}
            draggable={false}
          />

          {/* Dark overlay outside crop area */}
          <Box
            sx={{
              position: 'absolute',
              inset: 0,
              pointerEvents: 'none',
            }}
          >
            {/* Top overlay */}
            <Box
              sx={{
                position: 'absolute',
                top: 0,
                left: 0,
                right: 0,
                height: `${cropArea.y}%`,
                backgroundColor: 'rgba(0, 0, 0, 0.6)',
              }}
            />
            {/* Bottom overlay */}
            <Box
              sx={{
                position: 'absolute',
                bottom: 0,
                left: 0,
                right: 0,
                height: `${100 - cropArea.y - cropArea.height}%`,
                backgroundColor: 'rgba(0, 0, 0, 0.6)',
              }}
            />
            {/* Left overlay */}
            <Box
              sx={{
                position: 'absolute',
                top: `${cropArea.y}%`,
                left: 0,
                width: `${cropArea.x}%`,
                height: `${cropArea.height}%`,
                backgroundColor: 'rgba(0, 0, 0, 0.6)',
              }}
            />
            {/* Right overlay */}
            <Box
              sx={{
                position: 'absolute',
                top: `${cropArea.y}%`,
                right: 0,
                width: `${100 - cropArea.x - cropArea.width}%`,
                height: `${cropArea.height}%`,
                backgroundColor: 'rgba(0, 0, 0, 0.6)',
              }}
            />
          </Box>

          {/* Crop area with handles */}
          <Box
            sx={{
              position: 'absolute',
              top: `${cropArea.y}%`,
              left: `${cropArea.x}%`,
              width: `${cropArea.width}%`,
              height: `${cropArea.height}%`,
              border: '2px solid white',
              boxSizing: 'border-box',
            }}
          >
            {/* Move handle (center area) */}
            <CropHandleArea
              handle="move"
              onDragStart={handleDragStart}
              sx={{
                position: 'absolute',
                inset: 8,
                cursor: 'move',
              }}
            />

            {/* Corner handles */}
            <CropHandle handle="nw" onDragStart={handleDragStart} position="top-left" />
            <CropHandle handle="ne" onDragStart={handleDragStart} position="top-right" />
            <CropHandle handle="sw" onDragStart={handleDragStart} position="bottom-left" />
            <CropHandle handle="se" onDragStart={handleDragStart} position="bottom-right" />

            {/* Edge handles */}
            <CropHandle handle="n" onDragStart={handleDragStart} position="top" />
            <CropHandle handle="s" onDragStart={handleDragStart} position="bottom" />
            <CropHandle handle="w" onDragStart={handleDragStart} position="left" />
            <CropHandle handle="e" onDragStart={handleDragStart} position="right" />

            {/* Grid lines for alignment */}
            <Box
              sx={{
                position: 'absolute',
                inset: 0,
                display: 'grid',
                gridTemplateColumns: '1fr 1fr 1fr',
                gridTemplateRows: '1fr 1fr 1fr',
                pointerEvents: 'none',
                opacity: isDragging ? 1 : 0.5,
                transition: 'opacity 0.2s',
              }}
            >
              {Array.from({ length: 9 }).map((_, i) => (
                <Box
                  key={i}
                  sx={{
                    borderRight: i % 3 !== 2 ? '1px solid rgba(255,255,255,0.3)' : 'none',
                    borderBottom: i < 6 ? '1px solid rgba(255,255,255,0.3)' : 'none',
                  }}
                />
              ))}
            </Box>
          </Box>
        </Box>
      </Box>

      {/* Instructions */}
      <Box sx={{ px: 2, py: 1, textAlign: 'center' }}>
        <Typography variant="body2" sx={{ color: 'rgba(255, 255, 255, 0.7)' }}>
          Drag to adjust crop area
        </Typography>
      </Box>

      {/* Action buttons */}
      <Box
        sx={{
          display: 'flex',
          justifyContent: 'space-around',
          alignItems: 'center',
          p: 2,
          gap: 2,
          background: 'linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.5) 100%)',
        }}
      >
        <Button
          onClick={onRetake}
          startIcon={<ReplayIcon />}
          sx={{ color: 'white' }}
          disabled={isProcessing}
        >
          Retake
        </Button>

        <Button
          onClick={handleReset}
          startIcon={<RefreshIcon />}
          sx={{ color: 'white' }}
          disabled={isProcessing}
        >
          Reset
        </Button>

        <Button
          onClick={onSkip}
          startIcon={<SkipNextIcon />}
          sx={{ color: 'white' }}
          disabled={isProcessing}
        >
          Skip
        </Button>

        <IconButton
          onClick={handleConfirm}
          disabled={isProcessing}
          aria-label="Confirm crop"
          sx={{
            width: 56,
            height: 56,
            backgroundColor: 'primary.main',
            color: 'white',
            '&:hover': {
              backgroundColor: 'primary.dark',
            },
            '&:disabled': {
              backgroundColor: 'action.disabled',
            },
          }}
        >
          {isProcessing ? (
            <CircularProgress size={24} color="inherit" />
          ) : (
            <CheckIcon />
          )}
        </IconButton>
      </Box>
    </Box>
  );
};

interface CropHandleProps {
  handle: CropHandle;
  onDragStart: (handle: CropHandle, event: React.MouseEvent | React.TouchEvent) => void;
  position:
    | 'top-left'
    | 'top-right'
    | 'bottom-left'
    | 'bottom-right'
    | 'top'
    | 'bottom'
    | 'left'
    | 'right';
}

const CropHandle: React.FC<CropHandleProps> = ({ handle, onDragStart, position }) => {
  const handleSize = 24;
  const handleVisualSize = 12;

  const positionStyles: Record<string, React.CSSProperties> = {
    'top-left': {
      top: -handleSize / 2,
      left: -handleSize / 2,
      cursor: 'nwse-resize',
    },
    'top-right': {
      top: -handleSize / 2,
      right: -handleSize / 2,
      cursor: 'nesw-resize',
    },
    'bottom-left': {
      bottom: -handleSize / 2,
      left: -handleSize / 2,
      cursor: 'nesw-resize',
    },
    'bottom-right': {
      bottom: -handleSize / 2,
      right: -handleSize / 2,
      cursor: 'nwse-resize',
    },
    top: {
      top: -handleSize / 2,
      left: '50%',
      transform: 'translateX(-50%)',
      cursor: 'ns-resize',
    },
    bottom: {
      bottom: -handleSize / 2,
      left: '50%',
      transform: 'translateX(-50%)',
      cursor: 'ns-resize',
    },
    left: {
      top: '50%',
      left: -handleSize / 2,
      transform: 'translateY(-50%)',
      cursor: 'ew-resize',
    },
    right: {
      top: '50%',
      right: -handleSize / 2,
      transform: 'translateY(-50%)',
      cursor: 'ew-resize',
    },
  };

  const isCorner = position.includes('-');

  return (
    <Box
      onMouseDown={(e) => onDragStart(handle, e)}
      onTouchStart={(e) => onDragStart(handle, e)}
      sx={{
        position: 'absolute',
        width: handleSize,
        height: handleSize,
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
        zIndex: 10,
        ...positionStyles[position],
      }}
    >
      <Box
        sx={{
          width: isCorner ? handleVisualSize : position === 'top' || position === 'bottom' ? 24 : 8,
          height: isCorner ? handleVisualSize : position === 'left' || position === 'right' ? 24 : 8,
          backgroundColor: 'white',
          borderRadius: isCorner ? '50%' : 1,
          boxShadow: '0 2px 4px rgba(0,0,0,0.3)',
        }}
      />
    </Box>
  );
};

interface CropHandleAreaProps {
  handle: CropHandle;
  onDragStart: (handle: CropHandle, event: React.MouseEvent | React.TouchEvent) => void;
  sx?: React.CSSProperties & { [key: string]: unknown };
}

const CropHandleArea: React.FC<CropHandleAreaProps> = ({ handle, onDragStart, sx }) => {
  return (
    <Box
      onMouseDown={(e) => onDragStart(handle, e)}
      onTouchStart={(e) => onDragStart(handle, e)}
      sx={sx}
    />
  );
};

export default CropTool;