'use client';

import { useState, useCallback } from 'react';
import { useMachines } from '@/lib/hooks';
import type { InspectionTemplate, InspectionTemplateItem } from '@/lib/types';

const SCHEDULE_LABELS: Record<string, string> = {
  daily: '일일',
  weekly: '주간',
  monthly: '월간',
  yearly: '연간',
  ad_hoc: '수시',
};

const MODE_LABELS: Record<string, string> = {
  checklist: '체크리스트',
  measurement: '측정',
  monitoring: '모니터링',
};

const DATA_TYPE_LABELS: Record<string, string> = {
  numeric: '숫자',
  boolean: '예/아니오',
  text: '텍스트',
  select: '선택',
};

interface ItemDraft {
  id?: string;
  name: string;
  category: string;
  data_type: string;
  unit: string;
  spec_min: string;
  spec_max: string;
  select_options_text: string;
  equipment_part_id: string;
  is_required: boolean;
}

interface TemplateDraft {
  name: string;
  subject_type: string;
  machine_id: string;
  product_code: string;
  schedule_type: string;
  inspection_mode: string;
}

interface Props {
  tenantId: string;
  initialData?: InspectionTemplate | null;
  onSave: (meta: TemplateDraft, items: ItemDraft[]) => Promise<void>;
  isEdit?: boolean;
}

function itemToItemDraft(item: InspectionTemplateItem): ItemDraft {
  return {
    id: item.id,
    name: item.name,
    category: item.category || '',
    data_type: item.data_type,
    unit: item.unit || '',
    spec_min: item.spec_min !== null ? String(item.spec_min) : '',
    spec_max: item.spec_max !== null ? String(item.spec_max) : '',
    select_options_text: item.select_options ? item.select_options.join(', ') : '',
    equipment_part_id: item.equipment_part_id || '',
    is_required: item.is_required,
  };
}

const EMPTY_ITEM: ItemDraft = {
  name: '',
  category: '',
  data_type: 'numeric',
  unit: '',
  spec_min: '',
  spec_max: '',
  select_options_text: '',
  equipment_part_id: '',
  is_required: true,
};

export function TemplateEditor({ tenantId, initialData, onSave, isEdit }: Props) {
  const [meta, setMeta] = useState<TemplateDraft>({
    name: initialData?.name || '',
    subject_type: initialData?.subject_type || 'equipment',
    machine_id: initialData?.machine_id || '',
    product_code: initialData?.product_code || '',
    schedule_type: initialData?.schedule_type || 'daily',
    inspection_mode: initialData?.inspection_mode || 'measurement',
  });

  const [items, setItems] = useState<ItemDraft[]>(
    initialData?.items?.map(itemToItemDraft) || []
  );
  const [submitting, setSubmitting] = useState(false);
  const [showAddItem, setShowAddItem] = useState(false);
  const [newItem, setNewItem] = useState<ItemDraft>({ ...EMPTY_ITEM });

  const { machines } = useMachines(tenantId);

  const handleMetaChange = useCallback((field: string, value: string) => {
    setMeta(prev => ({ ...prev, [field]: value }));
  }, []);

  const addItem = useCallback(() => {
    if (!newItem.name.trim()) return;
    setItems(prev => [...prev, { ...newItem }]);
    setNewItem({ ...EMPTY_ITEM });
    setShowAddItem(false);
  }, [newItem]);

  const removeItem = useCallback((idx: number) => {
    if (!confirm('이 검사 항목을 삭제하시겠습니까?')) return;
    setItems(prev => prev.filter((_, i) => i !== idx));
  }, []);

  const moveItem = useCallback((idx: number, direction: -1 | 1) => {
    setItems(prev => {
      const next = [...prev];
      const target = idx + direction;
      if (target < 0 || target >= next.length) return prev;
      [next[idx], next[target]] = [next[target], next[idx]];
      return next;
    });
  }, []);

  const updateItem = useCallback((idx: number, field: string, value: string | boolean) => {
    setItems(prev => prev.map((item, i) =>
      i === idx ? { ...item, [field]: value } : item
    ));
  }, []);

  const handleSubmit = useCallback(async (e: React.FormEvent) => {
    e.preventDefault();
    if (!meta.name.trim()) return;
    setSubmitting(true);
    try {
      await onSave(meta, items);
    } finally {
      setSubmitting(false);
    }
  }, [meta, items, onSave]);

  return (
    <form onSubmit={handleSubmit}>
      <div className="card" style={{ marginBottom: '1.5rem' }}>
        <div className="card-header">
          <h3>기본 정보</h3>
        </div>
        <div className="card-body">
          <div className="form-field">
            <label>템플릿 이름 *</label>
            <input
              type="text"
              placeholder="예: 1호기 일일검사"
              value={meta.name}
              onChange={e => handleMetaChange('name', e.target.value)}
              disabled={submitting}
              autoFocus
            />
          </div>

          <div className="form-row">
            <div className="form-field">
              <label>검사 대상</label>
              <div className="radio-group">
                <label className="radio-label">
                  <input
                    type="radio"
                    name="subject_type"
                    value="equipment"
                    checked={meta.subject_type === 'equipment'}
                    onChange={e => handleMetaChange('subject_type', e.target.value)}
                    disabled={submitting}
                  />
                  설비검사
                </label>
                <label className="radio-label">
                  <input
                    type="radio"
                    name="subject_type"
                    value="product"
                    checked={meta.subject_type === 'product'}
                    onChange={e => handleMetaChange('subject_type', e.target.value)}
                    disabled={submitting}
                  />
                  품질검사
                </label>
              </div>
            </div>
          </div>

          {meta.subject_type === 'equipment' && (
            <div className="form-field">
              <label>대상 설비</label>
              <select
                value={meta.machine_id}
                onChange={e => handleMetaChange('machine_id', e.target.value)}
                disabled={submitting}
              >
                <option value="">선택 안함</option>
                {machines.map(m => (
                  <option key={m.id} value={m.id}>{m.name} ({m.equipment_code})</option>
                ))}
              </select>
            </div>
          )}

          <div className="form-row">
            <div className="form-field">
              <label>검사 주기</label>
              <select
                value={meta.schedule_type}
                onChange={e => handleMetaChange('schedule_type', e.target.value)}
                disabled={submitting}
              >
                {Object.entries(SCHEDULE_LABELS).map(([value, label]) => (
                  <option key={value} value={value}>{label}</option>
                ))}
              </select>
            </div>
            <div className="form-field">
              <label>검사 모드</label>
              <select
                value={meta.inspection_mode}
                onChange={e => handleMetaChange('inspection_mode', e.target.value)}
                disabled={submitting}
              >
                {Object.entries(MODE_LABELS).map(([value, label]) => (
                  <option key={value} value={value}>{label}</option>
                ))}
              </select>
            </div>
          </div>
        </div>
      </div>

      <div className="card" style={{ marginBottom: '1.5rem' }}>
        <div className="card-header">
          <h3>검사 항목 ({items.length}개)</h3>
          <button
            type="button"
            className="btn-outline btn-sm"
            onClick={() => setShowAddItem(true)}
            disabled={submitting}
          >
            <span className="material-symbols-outlined">add</span>
            항목 추가
          </button>
        </div>
        <div className="card-body">
          {items.length === 0 ? (
            <div className="empty-state" style={{ padding: '2rem' }}>
              <span className="material-symbols-outlined">playlist_add</span>
              <p>검사 항목이 없습니다. 항목을 추가하세요.</p>
            </div>
          ) : (
            <div className="items-list">
              {items.map((item, idx) => (
                <div key={idx} className="item-row">
                  <div className="item-order">
                    <button type="button" className="btn-icon" onClick={() => moveItem(idx, -1)} disabled={idx === 0 || submitting}>
                      <span className="material-symbols-outlined">keyboard_arrow_up</span>
                    </button>
                    <span className="order-num">{idx + 1}</span>
                    <button type="button" className="btn-icon" onClick={() => moveItem(idx, 1)} disabled={idx === items.length - 1 || submitting}>
                      <span className="material-symbols-outlined">keyboard_arrow_down</span>
                    </button>
                  </div>
                  <div className="item-fields">
                    <div className="form-row">
                      <div className="form-field">
                        <input
                          type="text"
                          placeholder="항목명"
                          value={item.name}
                          onChange={e => updateItem(idx, 'name', e.target.value)}
                          disabled={submitting}
                        />
                      </div>
                      <div className="form-field" style={{ maxWidth: '120px' }}>
                        <select
                          value={item.data_type}
                          onChange={e => updateItem(idx, 'data_type', e.target.value)}
                          disabled={submitting}
                        >
                          {Object.entries(DATA_TYPE_LABELS).map(([v, l]) => (
                            <option key={v} value={v}>{l}</option>
                          ))}
                        </select>
                      </div>
                      <label className="checkbox-label" style={{ minWidth: 'auto' }}>
                        <input
                          type="checkbox"
                          checked={item.is_required}
                          onChange={e => updateItem(idx, 'is_required', e.target.checked)}
                          disabled={submitting}
                        />
                        필수
                      </label>
                    </div>
                    {item.data_type === 'numeric' && (
                      <div className="form-row">
                        <div className="form-field">
                          <input type="text" placeholder="단위 (예: ℃)" value={item.unit} onChange={e => updateItem(idx, 'unit', e.target.value)} disabled={submitting} />
                        </div>
                        <div className="form-field">
                          <input type="number" placeholder="하한" value={item.spec_min} onChange={e => updateItem(idx, 'spec_min', e.target.value)} disabled={submitting} step="any" />
                        </div>
                        <div className="form-field">
                          <input type="number" placeholder="상한" value={item.spec_max} onChange={e => updateItem(idx, 'spec_max', e.target.value)} disabled={submitting} step="any" />
                        </div>
                      </div>
                    )}
                    {item.data_type === 'select' && (
                      <div className="form-field">
                        <input
                          type="text"
                          placeholder="선택지 (쉼표로 구분, 예: 양호, 불량, N/A)"
                          value={item.select_options_text}
                          onChange={e => updateItem(idx, 'select_options_text', e.target.value)}
                          disabled={submitting}
                        />
                      </div>
                    )}
                  </div>
                  <button type="button" className="btn-icon btn-danger" onClick={() => removeItem(idx)} disabled={submitting}>
                    <span className="material-symbols-outlined">delete</span>
                  </button>
                </div>
              ))}
            </div>
          )}
        </div>
      </div>

      {showAddItem && (
        <div className="modal-overlay" onClick={() => setShowAddItem(false)}>
          <div className="modal-content modal-lg" onClick={e => e.stopPropagation()}>
            <div className="modal-header">
              <h3>검사 항목 추가</h3>
              <button type="button" className="modal-close" onClick={() => setShowAddItem(false)}>
                <span className="material-symbols-outlined">close</span>
              </button>
            </div>
            <div className="modal-body-form">
            <div className="form-field">
              <label>항목명 *</label>
              <input
                type="text"
                placeholder="예: 유압 압력"
                value={newItem.name}
                onChange={e => setNewItem(prev => ({ ...prev, name: e.target.value }))}
                autoFocus
              />
            </div>
            <div className="form-row">
              <div className="form-field">
                <label>데이터 유형</label>
                <select value={newItem.data_type} onChange={e => setNewItem(prev => ({ ...prev, data_type: e.target.value }))}>
                  {Object.entries(DATA_TYPE_LABELS).map(([v, l]) => (
                    <option key={v} value={v}>{l}</option>
                  ))}
                </select>
              </div>
              <div className="form-field">
                <label>카테고리</label>
                <input type="text" placeholder="예: 안전" value={newItem.category} onChange={e => setNewItem(prev => ({ ...prev, category: e.target.value }))} />
              </div>
            </div>
            {newItem.data_type === 'numeric' && (
              <div className="form-row">
                <div className="form-field">
                  <label>단위</label>
                  <input type="text" placeholder="예: ℃" value={newItem.unit} onChange={e => setNewItem(prev => ({ ...prev, unit: e.target.value }))} />
                </div>
                <div className="form-field">
                  <label>하한</label>
                  <input type="number" placeholder="스펙 하한" value={newItem.spec_min} onChange={e => setNewItem(prev => ({ ...prev, spec_min: e.target.value }))} step="any" />
                </div>
                <div className="form-field">
                  <label>상한</label>
                  <input type="number" placeholder="스펙 상한" value={newItem.spec_max} onChange={e => setNewItem(prev => ({ ...prev, spec_max: e.target.value }))} step="any" />
                </div>
              </div>
            )}
            {newItem.data_type === 'select' && (
              <div className="form-field">
                <label>선택지</label>
                <input
                  type="text"
                  placeholder="쉼표로 구분 (예: 양호, 불량, N/A)"
                  value={newItem.select_options_text}
                  onChange={e => setNewItem(prev => ({ ...prev, select_options_text: e.target.value }))}
                />
              </div>
            )}
            <label className="checkbox-label">
              <input type="checkbox" checked={newItem.is_required} onChange={e => setNewItem(prev => ({ ...prev, is_required: e.target.checked }))} />
              필수 항목
            </label>
            <div className="modal-actions">
              <button type="button" className="btn-outline" onClick={() => setShowAddItem(false)}>취소</button>
              <button type="button" className="btn-primary" onClick={addItem} disabled={!newItem.name.trim()}>
                <span className="material-symbols-outlined">add</span>
                추가
              </button>
            </div>
            </div>
          </div>
        </div>
      )}

      <div className="form-actions">
        <button type="submit" className="btn-primary" disabled={submitting || !meta.name.trim()}>
          {submitting ? (
            <span className="material-symbols-outlined spinning">progress_activity</span>
          ) : (
            <span className="material-symbols-outlined">{isEdit ? 'save' : 'add'}</span>
          )}
          {isEdit ? '저장' : '템플릿 생성'}
        </button>
      </div>
    </form>
  );
}

export { SCHEDULE_LABELS, MODE_LABELS, DATA_TYPE_LABELS };
export type { TemplateDraft, ItemDraft };