'use client';

import React, { Component, ReactNode } from 'react';
import { Box, Button, Typography, Paper, Alert } from '@mui/material';
import { ErrorOutline, Refresh, Home } from '@mui/icons-material';
import errorLogger, { ErrorSeverity } from '@/lib/services/errorLogger';

interface Props {
  children: ReactNode;
  fallback?: ReactNode;
  onError?: (error: Error, errorInfo: React.ErrorInfo) => void;
  isolate?: boolean; // If true, only this section fails, not the whole app
}

interface State {
  hasError: boolean;
  error: Error | null;
  errorInfo: React.ErrorInfo | null;
  errorCount: number;
}

/**
 * Error Boundary component that catches JavaScript errors in child components
 * Displays fallback UI and logs errors for monitoring
 */
export class ErrorBoundary extends Component<Props, State> {
  constructor(props: Props) {
    super(props);
    this.state = {
      hasError: false,
      error: null,
      errorInfo: null,
      errorCount: 0,
    };
  }

  static getDerivedStateFromError(error: Error): Partial<State> {
    // Update state so the next render will show the fallback UI
    return {
      hasError: true,
      error,
    };
  }

  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
    // Log error to console in development
    if (process.env.NODE_ENV === 'development') {
      console.error('ErrorBoundary caught an error:', error, errorInfo);
    }

    // Update state with error details
    this.setState((prevState) => ({
      errorInfo,
      errorCount: prevState.errorCount + 1,
    }));

    // Call custom error handler if provided
    if (this.props.onError) {
      this.props.onError(error, errorInfo);
    }

    // Log to error tracking service (e.g., Sentry)
    this.logErrorToService(error, errorInfo);
  }

  logErrorToService = (error: Error, errorInfo: React.ErrorInfo) => {
    // Log to error tracking service
    errorLogger.logError(
      error,
      {
        componentStack: errorInfo.componentStack,
        errorBoundary: this.props.isolate ? 'isolated' : 'global',
      },
      ErrorSeverity.ERROR
    );
  };

  handleReset = () => {
    this.setState({
      hasError: false,
      error: null,
      errorInfo: null,
    });
  };

  handleGoHome = () => {
    window.location.href = '/';
  };

  render() {
    if (this.state.hasError) {
      // Custom fallback UI if provided
      if (this.props.fallback) {
        return this.props.fallback;
      }

      // Default fallback UI
      return (
        <Box
          sx={{
            minHeight: this.props.isolate ? '200px' : '100vh',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            p: 3,
            bgcolor: this.props.isolate ? 'transparent' : 'background.default',
          }}
        >
          <Paper
            elevation={3}
            sx={{
              maxWidth: 600,
              width: '100%',
              p: 4,
              borderRadius: 3,
              textAlign: 'center',
            }}
          >
            <ErrorOutline
              sx={{
                fontSize: 64,
                color: 'error.main',
                mb: 2,
              }}
            />

            <Typography variant="h5" fontWeight="600" gutterBottom>
              Oops! Something went wrong
            </Typography>

            <Typography variant="body1" color="text.secondary" sx={{ mb: 3 }}>
              {this.props.isolate
                ? 'This section encountered an error. The rest of the app should still work.'
                : "We're sorry for the inconvenience. The error has been logged and we'll look into it."}
            </Typography>

            {process.env.NODE_ENV === 'development' && this.state.error && (
              <Alert severity="error" sx={{ mb: 3, textAlign: 'left' }}>
                <Typography variant="body2" fontWeight="600" gutterBottom>
                  {this.state.error.message}
                </Typography>
                <Typography
                  variant="caption"
                  component="pre"
                  sx={{
                    mt: 1,
                    fontSize: '0.7rem',
                    overflow: 'auto',
                    maxHeight: 200,
                  }}
                >
                  {this.state.error.stack}
                </Typography>
              </Alert>
            )}

            <Box sx={{ display: 'flex', gap: 2, justifyContent: 'center', flexWrap: 'wrap' }}>
              <Button
                variant="contained"
                startIcon={<Refresh />}
                onClick={this.handleReset}
                size="large"
              >
                Try Again
              </Button>

              {!this.props.isolate && (
                <Button
                  variant="outlined"
                  startIcon={<Home />}
                  onClick={this.handleGoHome}
                  size="large"
                >
                  Go Home
                </Button>
              )}
            </Box>

            {this.state.errorCount > 1 && (
              <Alert severity="warning" sx={{ mt: 3 }}>
                This error has occurred {this.state.errorCount} times. You may want to refresh the
                entire page or contact support.
              </Alert>
            )}
          </Paper>
        </Box>
      );
    }

    return this.props.children;
  }
}

/**
 * Hook-based error boundary (for functional components)
 * Note: This is a workaround since React doesn't have hook-based error boundaries yet
 */
export function useErrorHandler(error?: Error) {
  const [, setError] = React.useState();

  return React.useCallback(
    (error: Error) => {
      setError(() => {
        throw error;
      });
    },
    [setError]
  );
}