import React, { useState } from 'react';
import {
  View,
  Text,
  ActivityIndicator,
  ScrollView,
  TouchableOpacity,
} from 'react-native';
import Icon from 'react-native-vector-icons/Ionicons';
import { useTheme } from '@theme';
import { DashboardProjectActivityItem } from '@interfaces';
import { getStyles } from './projectActivityFeed.styles';
import { ProjectActivityFeedProps } from './projectActivityFeed.props';
import { colors as globalColors } from '@theme';

const AVATAR_COLORS = [
  '#5B4CF5', // indigo
  '#8B5CF6', // violet
  '#06B6D4', // cyan
  '#10B981', // emerald
  '#F59E0B', // amber
  '#EF4444', // red
  '#EC4899', // pink
];

const getInitials = (name: string): string => {
  const parts = name.trim().split(' ');
  if (parts.length >= 2) {
    return `${parts[0][0]}${parts[1][0]}`.toUpperCase();
  }
  return name.slice(0, 2).toUpperCase();
};

const ActivityRow = ({
  item,
  index,
  isLast,
  styles,
  textMutedColor,
}: {
  item: DashboardProjectActivityItem;
  index: number;
  isLast: boolean;
  styles: ReturnType<typeof getStyles>;
  textMutedColor: string;
}) => {
  const avatarColor = AVATAR_COLORS[index % AVATAR_COLORS.length];
  const initials = getInitials(item.fullname_formatted || item.fullname);

  return (
    <View style={styles.row}>
      {/* ── Left: avatar + timeline connector ── */}
      <View style={styles.leftCol}>
        <View style={[styles.avatar, { backgroundColor: avatarColor }]}>
          <Text style={styles.avatarText}>{initials}</Text>
        </View>
        {!isLast && <View style={styles.connector} />}
      </View>

      {/* ── Right: bubble content ── */}
      <View style={styles.rightCol}>
        <View style={styles.bubble}>
          {/* Name + time */}
          <View style={styles.bubbleHeader}>
            <Text style={styles.staffName} numberOfLines={1}>
              {item.fullname_formatted || item.fullname}
            </Text>
            <Text style={styles.timeAgo}>{item.date_time_ago}</Text>
          </View>

          {/* Action description */}
          <View style={styles.descriptionRow}>
            <View style={styles.actionDot} />
            <Text style={styles.description} numberOfLines={2}>
              {item.description}
            </Text>
          </View>

          {/* Project chip */}
          <View style={styles.projectChip}>
            <Icon name="folder-outline" size={10} color={globalColors.accentAlt} />
            <Text style={styles.projectChipText} numberOfLines={1}>
              {item.project_name}
            </Text>
          </View>

          {/* Additional data tag */}
          {!!item.additional_data && (
            <View style={styles.additionalTag}>
              <Icon name="document-text-outline" size={11} color={textMutedColor} />
              <Text style={styles.additionalText} numberOfLines={1}>
                {item.additional_data}
              </Text>
            </View>
          )}
        </View>
      </View>
    </View>
  );
};

export const ProjectActivityFeed = ({
  data = [],
  loading = false,
}: ProjectActivityFeedProps) => {
  const { theme: colors, isDark } = useTheme();
  const styles = getStyles(colors, isDark);
  const [expanded, setExpanded] = useState(false);

  const displayData = expanded ? data : data.slice(0, 5);
  const hasMore = data.length > 5;

  return (
    <View style={styles.card}>
      {/* ── Header ── */}
      <View style={styles.header}>
        <View style={styles.titleIconBadge}>
          <Icon name="pulse" size={16} color="#FFFFFF" />
        </View>
        <View style={styles.titleGroup}>
          <Text style={styles.title}>Latest Project Activity</Text>
          <Text style={styles.subtitle}>recent actions across projects</Text>
        </View>
        {!loading && data.length > 0 && (
          <View style={styles.countBadge}>
            <Text style={styles.countBadgeText}>{data.length}</Text>
          </View>
        )}
      </View>

      {/* ── Divider ── */}
      <View style={styles.divider} />

      {/* ── Body ── */}
      {loading ? (
        <View style={styles.stateContainer}>
          <ActivityIndicator size="large" color={globalColors.accent} />
        </View>
      ) : data.length === 0 ? (
        <View style={styles.stateContainer}>
          <Icon name="calendar-outline" size={32} color={colors.textMuted} />
          <Text style={styles.emptyText}>No recent activity</Text>
        </View>
      ) : (
        <>
          <ScrollView
            style={styles.listContent}
            scrollEnabled={false}
            showsVerticalScrollIndicator={false}
          >
            {displayData.map((item, index) => (
              <ActivityRow
                key={item.id}
                item={item}
                index={index}
                isLast={index === displayData.length - 1}
                styles={styles}
                textMutedColor={colors.textMuted}
              />
            ))}
          </ScrollView>

          {hasMore && (
            <View style={styles.footer}>
              <TouchableOpacity
                style={styles.footerButton}
                activeOpacity={0.7}
                onPress={() => setExpanded(!expanded)}
              >
                <Text style={styles.footerButtonText}>
                  {expanded ? 'Show Less' : `Show More (${data.length - 5} more)`}
                </Text>
                <Icon
                  name={expanded ? 'chevron-up' : 'chevron-down'}
                  size={14}
                  color={globalColors.primary}
                />
              </TouchableOpacity>
            </View>
          )}
        </>
      )}
    </View>
  );
};