/**
 * InboxSection - Section displaying inbox studies on Home page
 *
 * Shows the "Create New Study" card and lists all inbox studies
 * with their current status and available actions.
 */

import React, { useState, useEffect, useCallback } from 'react';
import { Inbox, RefreshCw, ChevronDown, ChevronRight } from 'lucide-react';
import { intakeApi } from '../../api/intake';
import { InboxStudy, TopicInfo } from '../../types/intake';
import { CreateStudyCard } from './CreateStudyCard';
import { InboxStudyCard } from './InboxStudyCard';
import { FinalizeModal } from './FinalizeModal';

interface InboxSectionProps {
  onStudyFinalized?: () => void;
}

export const InboxSection: React.FC<InboxSectionProps> = ({ onStudyFinalized }) => {
  const [inboxStudies, setInboxStudies] = useState<InboxStudy[]>([]);
  const [topics, setTopics] = useState<TopicInfo[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [isExpanded, setIsExpanded] = useState(true);
  const [selectedStudyForFinalize, setSelectedStudyForFinalize] = useState<string | null>(null);

  const loadData = useCallback(async () => {
    setIsLoading(true);
    try {
      const [inboxResponse, topicsResponse] = await Promise.all([
        intakeApi.listInbox(),
        intakeApi.listTopics(),
      ]);
      setInboxStudies(inboxResponse.studies);
      setTopics(topicsResponse.topics);
    } catch (err) {
      console.error('Failed to load inbox data:', err);
    } finally {
      setIsLoading(false);
    }
  }, []);

  useEffect(() => {
    loadData();
  }, [loadData]);

  const handleStudyCreated = (_studyName: string) => {
    loadData();
  };

  const handleStudyFinalized = (_finalPath: string) => {
    setSelectedStudyForFinalize(null);
    loadData();
    onStudyFinalized?.();
  };

  const pendingStudies = inboxStudies.filter(
    (s) => !['ready', 'running', 'completed'].includes(s.status)
  );

  return (
    <div className="space-y-4">
      {/* Section Header */}
      <button
        onClick={() => setIsExpanded(!isExpanded)}
        className="w-full flex items-center justify-between px-2 py-1 hover:bg-white/5 rounded-lg transition-colors"
      >
        <div className="flex items-center gap-3">
          <div className="w-8 h-8 rounded-lg bg-primary-400/10 flex items-center justify-center">
            <Inbox className="w-4 h-4 text-primary-400" />
          </div>
          <div className="text-left">
            <h2 className="text-lg font-semibold text-white">Study Inbox</h2>
            <p className="text-sm text-dark-400">
              {pendingStudies.length} pending studies
            </p>
          </div>
        </div>
        <div className="flex items-center gap-2">
          <button
            onClick={(e) => {
              e.stopPropagation();
              loadData();
            }}
            className="p-2 hover:bg-white/5 rounded-lg transition-colors text-dark-400 hover:text-primary-400"
            title="Refresh"
          >
            <RefreshCw className={`w-4 h-4 ${isLoading ? 'animate-spin' : ''}`} />
          </button>
          {isExpanded ? (
            <ChevronDown className="w-5 h-5 text-dark-400" />
          ) : (
            <ChevronRight className="w-5 h-5 text-dark-400" />
          )}
        </div>
      </button>

      {/* Content */}
      {isExpanded && (
        <div className="space-y-4">
          {/* Create Study Card */}
          <CreateStudyCard topics={topics} onStudyCreated={handleStudyCreated} />

          {/* Inbox Studies List */}
          {inboxStudies.length > 0 && (
            <div className="space-y-3">
              <h3 className="text-sm font-medium text-dark-400 px-2">
                Inbox Studies ({inboxStudies.length})
              </h3>
              {inboxStudies.map((study) => (
                <InboxStudyCard
                  key={study.study_name}
                  study={study}
                  onRefresh={loadData}
                  onSelect={setSelectedStudyForFinalize}
                />
              ))}
            </div>
          )}

          {/* Empty State */}
          {!isLoading && inboxStudies.length === 0 && (
            <div className="text-center py-8 text-dark-400">
              <Inbox className="w-12 h-12 mx-auto mb-3 opacity-30" />
              <p>No studies in inbox</p>
              <p className="text-sm text-dark-500">
                Create a new study to get started
              </p>
            </div>
          )}
        </div>
      )}

      {/* Finalize Modal */}
      {selectedStudyForFinalize && (
        <FinalizeModal
          studyName={selectedStudyForFinalize}
          topics={topics}
          onClose={() => setSelectedStudyForFinalize(null)}
          onFinalized={handleStudyFinalized}
        />
      )}
    </div>
  );
};

export default InboxSection;