import { useEffect, useState } from 'react';
import { Pressable, StyleSheet, Text, TextInput, View } from 'react-native';
import { useInboxStore, type ActivityItem, type ApprovalItem, type InboxState } from '../../store/inbox-store';
import { buttonA11y, textInputA11y, dynamicType } from '../../lib/accessibility';
import { colors } from '../../theme';

export default function InboxScreen() {
  const approvals = useInboxStore((state: InboxState) => state.approvals);
  const activity = useInboxStore((state: InboxState) => state.activity);
  const isLoading = useInboxStore((state: InboxState) => state.isLoading);
  const hydrate = useInboxStore((state: InboxState) => state.hydrate);
  const approve = useInboxStore((state: InboxState) => state.approve);
  const reject = useInboxStore((state: InboxState) => state.reject);
  const [pendingApprovalId, setPendingApprovalId] = useState<string | null>(null);
  const [reviewNote, setReviewNote] = useState('');

  useEffect(() => {
    void hydrate();
  }, [hydrate]);

  return (
    <View style={styles.container}>
      <Text style={styles.title}>Inbox</Text>
      <Text style={styles.body}>Review simple agent actions and approve or reject them from mobile.</Text>
      {isLoading ? <Text style={styles.empty}>Loading approvals…</Text> : null}
      {approvals.length > 0 ? (
        <TextInput
          {...textInputA11y('Review note')}
          style={styles.reviewNoteInput}
          placeholder="Optional review note…"
          placeholderTextColor={colors.textSecondary}
          value={reviewNote}
          onChangeText={setReviewNote}
          multiline
          numberOfLines={2}
        />
      ) : null}
      {approvals.map((item: ApprovalItem) => (
        <View key={item.id} style={styles.card}>
          <Text style={styles.cardTitle}>{item.title}</Text>
          <Text style={styles.cardBody}>{item.summary}</Text>
          <Text style={styles.status}>Status: {item.status}</Text>
          <View style={styles.actionRow}>
            <Pressable
              {...buttonA11y(`Approve ${item.title}`, { disabled: pendingApprovalId === item.id || item.status !== 'pending' })}
              style={[
                styles.approveButton,
                pendingApprovalId === item.id || item.status !== 'pending' ? styles.buttonDisabled : null,
              ]}
              disabled={pendingApprovalId === item.id || item.status !== 'pending'}
              onPress={async () => {
                setPendingApprovalId(item.id);
                try {
                  const note = reviewNote.trim() || undefined;
                  await approve(item.id, note);
                  setReviewNote('');
                } finally {
                  setPendingApprovalId(null);
                }
              }}
            >
              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.approveText}>
                {pendingApprovalId === item.id ? 'Approving…' : 'Approve'}
              </Text>
            </Pressable>
            <Pressable
              {...buttonA11y(`Reject ${item.title}`, { disabled: pendingApprovalId === item.id || item.status !== 'pending' })}
              style={[
                styles.rejectButton,
                pendingApprovalId === item.id || item.status !== 'pending' ? styles.buttonDisabled : null,
              ]}
              disabled={pendingApprovalId === item.id || item.status !== 'pending'}
              onPress={async () => {
                setPendingApprovalId(item.id);
                try {
                  const note = reviewNote.trim() || undefined;
                  await reject(item.id, note);
                  setReviewNote('');
                } finally {
                  setPendingApprovalId(null);
                }
              }}
            >
              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.rejectText}>
                {pendingApprovalId === item.id ? 'Rejecting…' : 'Reject'}
              </Text>
            </Pressable>
          </View>
        </View>
      ))}
      {!isLoading && approvals.length === 0 ? (
        <Text style={styles.empty}>No approval items are waiting right now.</Text>
      ) : null}
      <View style={styles.feedSection}>
        <Text style={styles.feedTitle}>Recent activity</Text>
        {activity.map((item: ActivityItem) => (
          <View key={item.id} style={styles.feedCard}>
            <Text style={styles.feedKind}>{item.kind}</Text>
            <Text style={styles.cardTitle}>{item.title}</Text>
            <Text style={styles.cardBody}>{item.summary}</Text>
          </View>
        ))}
        {!isLoading && activity.length === 0 ? (
          <Text style={styles.empty}>No recent agent activity yet.</Text>
        ) : null}
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    padding: 20,
    backgroundColor: colors.bgCanvas,
    gap: 14,
  },
  title: {
    color: colors.textPrimary,
    fontSize: 28,
    fontWeight: '700',
  },
  body: {
    color: colors.textSecondary,
    fontSize: 15,
    lineHeight: 21,
  },
  empty: {
    color: colors.textSecondary,
    fontSize: 14,
  },
  card: {
    backgroundColor: colors.surfaceCard,
    borderRadius: 16,
    borderWidth: 1,
    borderColor: colors.borderDefault,
    padding: 16,
    gap: 8,
  },
  cardTitle: {
    color: colors.textPrimary,
    fontSize: 16,
    fontWeight: '700',
  },
  cardBody: {
    color: colors.textSecondary,
    fontSize: 14,
  },
  status: {
    color: colors.textSecondary,
    fontSize: 13,
    textTransform: 'capitalize',
  },
  actionRow: {
    flexDirection: 'row',
    gap: 10,
  },
  buttonDisabled: {
    opacity: 0.6,
  },
  approveButton: {
    backgroundColor: colors.accentPrimary,
    borderRadius: 10,
    paddingHorizontal: 12,
    paddingVertical: 10,
  },
  approveText: {
    color: colors.textPrimary,
    fontWeight: '700',
  },
  rejectButton: {
    borderWidth: 1,
    borderColor: colors.borderDefault,
    borderRadius: 10,
    paddingHorizontal: 12,
    paddingVertical: 10,
  },
  rejectText: {
    color: colors.textSecondary,
    fontWeight: '600',
  },
  feedSection: {
    gap: 10,
  },
  feedTitle: {
    color: colors.textPrimary,
    fontSize: 18,
    fontWeight: '700',
  },
  feedCard: {
    backgroundColor: colors.bgElevated,
    borderRadius: 14,
    borderWidth: 1,
    borderColor: colors.borderDefault,
    padding: 14,
    gap: 6,
  },
  feedKind: {
    color: colors.accentSecondary,
    fontSize: 12,
    fontWeight: '700',
    textTransform: 'uppercase',
  },
  reviewNoteInput: {
    backgroundColor: colors.bgElevated,
    borderRadius: 12,
    borderWidth: 1,
    borderColor: colors.borderDefault,
    color: colors.textPrimary,
    padding: 12,
    fontSize: 14,
    minHeight: 48,
    textAlignVertical: 'top' as const,
  },
});