import React from 'react';
import {
  View,
  Text,
  StyleSheet,
  ScrollView,
  TouchableOpacity,
  ActivityIndicator,
} from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import type { SensorSetupState, SensorSetupStep } from '@/types';
import {
  AppColors,
  BorderRadius,
  FontSizes,
  FontWeights,
  Spacing,
  Shadows,
} from '@/constants/theme';

interface BatchSetupProgressProps {
  sensors: SensorSetupState[];
  currentIndex: number;
  ssid: string;
  isPaused: boolean;
  onRetry?: (deviceId: string) => void;
  onSkip?: (deviceId: string) => void;
  onCancelAll?: () => void;
}

const STEP_LABELS: Record<SensorSetupStep['name'], string> = {
  connect: 'Connecting',
  unlock: 'Unlocking',
  wifi: 'Setting WiFi',
  attach: 'Registering',
  reboot: 'Rebooting',
};

function StepIndicator({ step }: { step: SensorSetupStep }) {
  const getIcon = () => {
    switch (step.status) {
      case 'completed':
        return <Ionicons name="checkmark" size={12} color={AppColors.success} />;
      case 'in_progress':
        return <ActivityIndicator size={10} color={AppColors.primary} />;
      case 'failed':
        return <Ionicons name="close" size={12} color={AppColors.error} />;
      default:
        return <View style={styles.pendingDot} />;
    }
  };

  const getTextColor = () => {
    switch (step.status) {
      case 'completed':
        return AppColors.success;
      case 'in_progress':
        return AppColors.primary;
      case 'failed':
        return AppColors.error;
      default:
        return AppColors.textMuted;
    }
  };

  return (
    <View style={styles.stepRow}>
      <View style={styles.stepIcon}>{getIcon()}</View>
      <Text style={[styles.stepLabel, { color: getTextColor() }]}>
        {STEP_LABELS[step.name]}
      </Text>
      {step.error && (
        <Text style={styles.stepError}>{step.error}</Text>
      )}
    </View>
  );
}

function SensorCard({
  sensor,
  isActive,
  onRetry,
  onSkip,
}: {
  sensor: SensorSetupState;
  isActive: boolean;
  onRetry?: () => void;
  onSkip?: () => void;
}) {
  const getStatusColor = () => {
    switch (sensor.status) {
      case 'success':
        return AppColors.success;
      case 'error':
        return AppColors.error;
      case 'skipped':
        return AppColors.warning;
      case 'pending':
        return AppColors.textMuted;
      default:
        return AppColors.primary;
    }
  };

  const getStatusIcon = () => {
    switch (sensor.status) {
      case 'success':
        return <Ionicons name="checkmark-circle" size={24} color={AppColors.success} />;
      case 'error':
        return <Ionicons name="close-circle" size={24} color={AppColors.error} />;
      case 'skipped':
        return <Ionicons name="remove-circle" size={24} color={AppColors.warning} />;
      case 'pending':
        return <Ionicons name="ellipse-outline" size={24} color={AppColors.textMuted} />;
      default:
        return <ActivityIndicator size={20} color={AppColors.primary} />;
    }
  };

  const showActions = sensor.status === 'error' && onRetry && onSkip;

  return (
    <View style={[styles.sensorCard, isActive && styles.sensorCardActive]}>
      <View style={styles.sensorHeader}>
        <View style={styles.sensorIcon}>
          <Ionicons name="water" size={20} color={getStatusColor()} />
        </View>
        <View style={styles.sensorInfo}>
          <Text style={styles.sensorName}>{sensor.deviceName}</Text>
          {sensor.wellId && (
            <Text style={styles.sensorMeta}>Well ID: {sensor.wellId}</Text>
          )}
        </View>
        <View style={styles.statusIcon}>{getStatusIcon()}</View>
      </View>

      {/* Show steps for active or completed sensors */}
      {(isActive || sensor.status === 'success' || sensor.status === 'error') && (
        <View style={styles.stepsContainer}>
          {sensor.steps.map((step, index) => (
            <StepIndicator key={step.name} step={step} />
          ))}
        </View>
      )}

      {/* Error message */}
      {sensor.error && (
        <View style={styles.errorContainer}>
          <Ionicons name="alert-circle" size={16} color={AppColors.error} />
          <Text style={styles.errorText}>{sensor.error}</Text>
        </View>
      )}

      {/* Action buttons for failed sensors */}
      {showActions && (
        <View style={styles.actionButtons}>
          <TouchableOpacity style={styles.retryButton} onPress={onRetry}>
            <Ionicons name="refresh" size={16} color={AppColors.primary} />
            <Text style={styles.retryText}>Retry</Text>
          </TouchableOpacity>
          <TouchableOpacity style={styles.skipButton} onPress={onSkip}>
            <Ionicons name="arrow-forward" size={16} color={AppColors.textMuted} />
            <Text style={styles.skipText}>Skip</Text>
          </TouchableOpacity>
        </View>
      )}
    </View>
  );
}

export default function BatchSetupProgress({
  sensors,
  currentIndex,
  ssid,
  isPaused,
  onRetry,
  onSkip,
  onCancelAll,
}: BatchSetupProgressProps) {
  const completedCount = sensors.filter(s => s.status === 'success').length;
  const failedCount = sensors.filter(s => s.status === 'error').length;
  const skippedCount = sensors.filter(s => s.status === 'skipped').length;
  const totalProcessed = completedCount + failedCount + skippedCount;
  const progress = (totalProcessed / sensors.length) * 100;

  return (
    <View style={styles.container}>
      {/* Progress Header */}
      <View style={styles.progressHeader}>
        <Text style={styles.progressTitle}>
          Connecting sensors to "{ssid}"...
        </Text>
        <Text style={styles.progressSubtitle}>
          {totalProcessed} of {sensors.length} complete
        </Text>

        {/* Progress bar */}
        <View style={styles.progressBarContainer}>
          <View style={[styles.progressBar, { width: `${progress}%` }]} />
        </View>
      </View>

      {/* Sensors List */}
      <ScrollView
        style={styles.sensorsList}
        contentContainerStyle={styles.sensorsListContent}
        showsVerticalScrollIndicator={false}
      >
        {sensors.map((sensor, index) => (
          <SensorCard
            key={sensor.deviceId}
            sensor={sensor}
            isActive={index === currentIndex && !isPaused}
            onRetry={onRetry ? () => onRetry(sensor.deviceId) : undefined}
            onSkip={onSkip ? () => onSkip(sensor.deviceId) : undefined}
          />
        ))}
      </ScrollView>

      {/* Cancel button */}
      {onCancelAll && (
        <TouchableOpacity style={styles.cancelAllButton} onPress={onCancelAll}>
          <Text style={styles.cancelAllText}>Cancel Setup</Text>
        </TouchableOpacity>
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  progressHeader: {
    marginBottom: Spacing.lg,
  },
  progressTitle: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
    marginBottom: Spacing.xs,
  },
  progressSubtitle: {
    fontSize: FontSizes.sm,
    color: AppColors.textSecondary,
    marginBottom: Spacing.md,
  },
  progressBarContainer: {
    height: 4,
    backgroundColor: AppColors.border,
    borderRadius: 2,
    overflow: 'hidden',
  },
  progressBar: {
    height: '100%',
    backgroundColor: AppColors.primary,
    borderRadius: 2,
  },
  sensorsList: {
    flex: 1,
  },
  sensorsListContent: {
    gap: Spacing.md,
    paddingBottom: Spacing.lg,
  },
  sensorCard: {
    backgroundColor: AppColors.surface,
    borderRadius: BorderRadius.lg,
    padding: Spacing.md,
    ...Shadows.xs,
  },
  sensorCardActive: {
    borderWidth: 2,
    borderColor: AppColors.primary,
  },
  sensorHeader: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  sensorIcon: {
    width: 40,
    height: 40,
    borderRadius: BorderRadius.md,
    backgroundColor: AppColors.primaryLighter,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: Spacing.sm,
  },
  sensorInfo: {
    flex: 1,
  },
  sensorName: {
    fontSize: FontSizes.base,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
  },
  sensorMeta: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
  },
  statusIcon: {
    marginLeft: Spacing.sm,
  },
  stepsContainer: {
    marginTop: Spacing.md,
    paddingTop: Spacing.sm,
    borderTopWidth: 1,
    borderTopColor: AppColors.border,
    gap: Spacing.xs,
  },
  stepRow: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
  },
  stepIcon: {
    width: 16,
    height: 16,
    justifyContent: 'center',
    alignItems: 'center',
  },
  pendingDot: {
    width: 6,
    height: 6,
    borderRadius: 3,
    backgroundColor: AppColors.textMuted,
  },
  stepLabel: {
    fontSize: FontSizes.sm,
    fontWeight: FontWeights.medium,
  },
  stepError: {
    fontSize: FontSizes.xs,
    color: AppColors.error,
    flex: 1,
  },
  errorContainer: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: Spacing.sm,
    padding: Spacing.sm,
    backgroundColor: AppColors.errorLight,
    borderRadius: BorderRadius.sm,
    gap: Spacing.xs,
  },
  errorText: {
    fontSize: FontSizes.xs,
    color: AppColors.error,
    flex: 1,
  },
  actionButtons: {
    flexDirection: 'row',
    marginTop: Spacing.md,
    gap: Spacing.md,
  },
  retryButton: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: Spacing.xs,
    paddingHorizontal: Spacing.md,
    backgroundColor: AppColors.primaryLighter,
    borderRadius: BorderRadius.md,
    gap: Spacing.xs,
  },
  retryText: {
    fontSize: FontSizes.sm,
    fontWeight: FontWeights.medium,
    color: AppColors.primary,
  },
  skipButton: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: Spacing.xs,
    paddingHorizontal: Spacing.md,
    backgroundColor: AppColors.surfaceSecondary,
    borderRadius: BorderRadius.md,
    gap: Spacing.xs,
  },
  skipText: {
    fontSize: FontSizes.sm,
    fontWeight: FontWeights.medium,
    color: AppColors.textMuted,
  },
  cancelAllButton: {
    alignItems: 'center',
    paddingVertical: Spacing.sm,
    marginTop: Spacing.md,
  },
  cancelAllText: {
    fontSize: FontSizes.sm,
    fontWeight: FontWeights.medium,
    color: AppColors.error,
  },
});