import React, { useState, useEffect } from 'react';
import { Plus, Trash2, Save, Clock, PenLine, Volume2, XCircle } from 'lucide-react';
import { processApi } from '../api/client';

export default function ManualSubtitleInput({ job, onProcessWithSubtitle, onProcessWithoutSubtitle, onCancel }) {
  const [segments, setSegments] = useState([]);
  const [isSaving, setIsSaving] = useState(false);
  const [videoDuration, setVideoDuration] = useState(60); // Default 60 seconds

  // Initialize with one empty segment
  useEffect(() => {
    if (segments.length === 0) {
      addSegment();
    }
  }, []);

  const addSegment = () => {
    const lastEnd = segments.length > 0 ? segments[segments.length - 1].end : 0;
    setSegments([
      ...segments,
      {
        id: Date.now(),
        start: lastEnd,
        end: Math.min(lastEnd + 3, videoDuration),
        text: '',
        translated: '',
      },
    ]);
  };

  const removeSegment = (id) => {
    setSegments(segments.filter((seg) => seg.id !== id));
  };

  const updateSegment = (id, field, value) => {
    setSegments(
      segments.map((seg) =>
        seg.id === id ? { ...seg, [field]: value } : seg
      )
    );
  };

  const formatTimeInput = (seconds) => {
    const mins = Math.floor(seconds / 60);
    const secs = (seconds % 60).toFixed(1);
    return `${mins}:${secs.padStart(4, '0')}`;
  };

  const parseTimeInput = (timeStr) => {
    const parts = timeStr.split(':');
    if (parts.length === 2) {
      const mins = parseInt(parts[0]) || 0;
      const secs = parseFloat(parts[1]) || 0;
      return mins * 60 + secs;
    }
    return parseFloat(timeStr) || 0;
  };

  const handleSaveSubtitles = async () => {
    // Validate segments
    const validSegments = segments.filter(
      (seg) => seg.text.trim() || seg.translated.trim()
    );

    if (validSegments.length === 0) {
      alert('최소 한 개의 자막을 입력해주세요.');
      return;
    }

    setIsSaving(true);
    try {
      // Format segments for API
      const formattedSegments = validSegments.map((seg) => ({
        start: seg.start,
        end: seg.end,
        text: seg.text.trim() || seg.translated.trim(),
        translated: seg.translated.trim() || seg.text.trim(),
      }));

      await processApi.addManualSubtitle(job.job_id, formattedSegments);
      onProcessWithSubtitle?.(formattedSegments);
    } catch (err) {
      console.error('Failed to save subtitles:', err);
      alert('자막 저장 실패: ' + (err.response?.data?.detail || err.message));
    } finally {
      setIsSaving(false);
    }
  };

  const handleProcessWithoutSubtitle = () => {
    onProcessWithoutSubtitle?.();
  };

  return (
    <div className="bg-gray-900 rounded-xl border border-gray-800 p-6">
      <div className="flex items-center justify-between mb-4">
        <div className="flex items-center gap-2">
          <PenLine size={20} className="text-amber-400" />
          <h3 className="font-medium text-white">자막 직접 입력</h3>
        </div>
        <span className="text-xs text-gray-500">
          {segments.length}개 세그먼트
        </span>
      </div>

      <p className="text-sm text-gray-400 mb-4">
        영상에 표시할 자막을 직접 입력하세요. 시작/종료 시간과 텍스트를 설정합니다.
      </p>

      {/* Segments List */}
      <div className="space-y-3 max-h-96 overflow-y-auto mb-4">
        {segments.map((segment, index) => (
          <div
            key={segment.id}
            className="p-4 bg-gray-800/50 rounded-lg border border-gray-700"
          >
            <div className="flex items-center justify-between mb-3">
              <span className="text-xs text-gray-500 font-mono">#{index + 1}</span>
              <button
                onClick={() => removeSegment(segment.id)}
                className="text-gray-500 hover:text-red-400 transition-colors"
                disabled={segments.length === 1}
              >
                <Trash2 size={16} />
              </button>
            </div>

            {/* Time Inputs */}
            <div className="flex gap-4 mb-3">
              <div className="flex-1">
                <label className="text-xs text-gray-500 mb-1 block">
                  <Clock size={12} className="inline mr-1" />
                  시작 (초)
                </label>
                <input
                  type="number"
                  step="0.1"
                  min="0"
                  value={segment.start}
                  onChange={(e) =>
                    updateSegment(segment.id, 'start', parseFloat(e.target.value) || 0)
                  }
                  className="w-full bg-gray-900 border border-gray-700 rounded px-3 py-2 text-sm focus:outline-none focus:border-amber-500"
                />
              </div>
              <div className="flex-1">
                <label className="text-xs text-gray-500 mb-1 block">
                  <Clock size={12} className="inline mr-1" />
                  종료 (초)
                </label>
                <input
                  type="number"
                  step="0.1"
                  min="0"
                  value={segment.end}
                  onChange={(e) =>
                    updateSegment(segment.id, 'end', parseFloat(e.target.value) || 0)
                  }
                  className="w-full bg-gray-900 border border-gray-700 rounded px-3 py-2 text-sm focus:outline-none focus:border-amber-500"
                />
              </div>
            </div>

            {/* Text Input */}
            <div>
              <label className="text-xs text-gray-500 mb-1 block">자막 텍스트</label>
              <textarea
                value={segment.translated || segment.text}
                onChange={(e) => updateSegment(segment.id, 'translated', e.target.value)}
                placeholder="표시할 자막을 입력하세요..."
                className="w-full bg-gray-900 border border-gray-700 rounded px-3 py-2 text-sm focus:outline-none focus:border-amber-500 resize-none"
                rows={2}
              />
            </div>
          </div>
        ))}
      </div>

      {/* Add Segment Button */}
      <button
        onClick={addSegment}
        className="w-full py-2 border border-dashed border-gray-700 rounded-lg text-gray-400 hover:text-white hover:border-gray-600 transition-colors flex items-center justify-center gap-2 mb-4"
      >
        <Plus size={16} />
        자막 추가
      </button>

      {/* Action Buttons */}
      <div className="space-y-3">
        <div className="flex gap-3">
          <button
            onClick={handleSaveSubtitles}
            disabled={isSaving || segments.every((s) => !s.text && !s.translated)}
            className="flex-1 btn-primary py-3 flex items-center justify-center gap-2"
          >
            <PenLine size={18} />
            {isSaving ? '저장 중...' : '자막으로 처리'}
          </button>
          <button
            onClick={handleProcessWithoutSubtitle}
            className="flex-1 btn-secondary py-3 flex items-center justify-center gap-2"
          >
            <Volume2 size={18} />
            BGM만 추가
          </button>
        </div>
        {onCancel && (
          <button
            onClick={onCancel}
            className="w-full py-2 border border-gray-700 rounded-lg text-gray-400 hover:text-red-400 hover:border-red-800 transition-colors flex items-center justify-center gap-2"
          >
            <XCircle size={16} />
            작업 취소
          </button>
        )}
      </div>
    </div>
  );
}