'use client';

import { useState } from 'react';
import { AnimatePresence, Reorder } from 'framer-motion';
import { Dialog, DialogContent, DialogTitle } from '../../components/ui/dialog';
import ConfirmModal from './ConfirmModal';
import { CloseIcon, DragIcon, PlusIcon, SettingsIcon, TrashIcon } from './Icons';

export default function GroupManageModal({ groups, onClose, onSave }) {
  const [items, setItems] = useState(groups);
  const [deleteConfirm, setDeleteConfirm] = useState(null); // { id, name }

  const handleReorder = (newOrder) => {
    setItems(newOrder);
  };

  const handleRename = (id, newName) => {
    const truncatedName = (newName || '').slice(0, 8);
    setItems(prev => prev.map(item => item.id === id ? { ...item, name: truncatedName } : item));
  };

  const handleDeleteClick = (id, name) => {
    const itemToDelete = items.find(it => it.id === id);
    const isNew = !groups.find(g => g.id === id);
    const isEmpty = itemToDelete && (!itemToDelete.codes || itemToDelete.codes.length === 0);

    if (isNew || isEmpty) {
      setItems(prev => prev.filter(item => item.id !== id));
    } else {
      setDeleteConfirm({ id, name });
    }
  };

  const handleConfirmDelete = () => {
    if (deleteConfirm) {
      setItems(prev => prev.filter(item => item.id !== deleteConfirm.id));
      setDeleteConfirm(null);
    }
  };

  const handleAddRow = () => {
    const newGroup = {
      id: `group_${Date.now()}`,
      name: '',
      codes: []
    };
    setItems(prev => [...prev, newGroup]);
  };

  const handleConfirm = () => {
    const hasEmpty = items.some(it => !it.name.trim());
    if (hasEmpty) return;
    onSave(items);
    onClose();
  };

  const isAllValid = items.every(it => it.name.trim() !== '');

  return (
    <>
      <Dialog
        open
        onOpenChange={(open) => {
          if (!open) onClose();
        }}
      >
        <DialogContent
          className="glass card modal"
          overlayClassName="modal-overlay"
          style={{ maxWidth: '500px', width: '90vw', zIndex: 99 }}
          onOpenAutoFocus={(event) => event.preventDefault()}
        >
          <DialogTitle asChild>
            <div className="title" style={{ marginBottom: 20, justifyContent: 'space-between' }}>
              <div style={{ display: 'flex', alignItems: 'center', gap: 10 }}>
                <SettingsIcon width="20" height="20" />
                <span>管理分组</span>
              </div>
            </div>
          </DialogTitle>

          <div className="group-manage-list-container" style={{ maxHeight: '60vh', overflowY: 'auto', paddingRight: '4px' }}>
            {items.length === 0 ? (
              <div className="empty-state muted" style={{ textAlign: 'center', padding: '40px 0' }}>
                <div style={{ fontSize: '32px', marginBottom: 12, opacity: 0.5 }}>📂</div>
                <p>暂无自定义分组</p>
              </div>
            ) : (
              <Reorder.Group axis="y" values={items} onReorder={handleReorder} className="group-manage-list">
                <AnimatePresence mode="popLayout">
                  {items.map((item) => (
                    <Reorder.Item
                      key={item.id}
                      value={item}
                      className="group-manage-item glass"
                      layout
                      initial={{ opacity: 0, scale: 0.98 }}
                      animate={{ opacity: 1, scale: 1 }}
                      exit={{ opacity: 0, scale: 0.98 }}
                      transition={{
                        type: 'spring',
                        stiffness: 500,
                        damping: 35,
                        mass: 1,
                        layout: { duration: 0.2 }
                      }}
                    >
                      <div className="drag-handle" style={{ cursor: 'grab', display: 'flex', alignItems: 'center', padding: '0 8px' }}>
                        <DragIcon width="18" height="18" className="muted" />
                      </div>
                      <input
                        className={`input group-rename-input ${!item.name.trim() ? 'error' : ''}`}
                        value={item.name}
                        onChange={(e) => handleRename(item.id, e.target.value)}
                        placeholder="请输入分组名称..."
                        style={{
                          flex: 1,
                          height: '36px',
                          background: 'rgba(0,0,0,0.2)',
                          border: !item.name.trim() ? '1px solid var(--danger)' : 'none'
                        }}
                      />
                      <button
                        className="icon-button danger"
                        onClick={() => handleDeleteClick(item.id, item.name)}
                        title="删除分组"
                        style={{ width: '36px', height: '36px', flexShrink: 0 }}
                      >
                        <TrashIcon width="16" height="16" />
                      </button>
                    </Reorder.Item>
                  ))}
                </AnimatePresence>
              </Reorder.Group>
            )}
            <button
              className="add-group-row-btn"
              onClick={handleAddRow}
              style={{
                width: '100%',
                marginTop: 12,
                padding: '10px',
                borderRadius: '12px',
                border: '1px dashed var(--border)',
                background: 'rgba(255,255,255,0.02)',
                color: 'var(--muted)',
                fontSize: '14px',
                display: 'flex',
                alignItems: 'center',
                justifyContent: 'center',
                gap: '8px',
                cursor: 'pointer',
                transition: 'all 0.2s ease'
              }}
            >
              <PlusIcon width="16" height="16" />
              <span>新增分组</span>
            </button>
          </div>

          <div style={{ marginTop: 24 }}>
            {!isAllValid && (
              <div className="error-text" style={{ marginBottom: 12, textAlign: 'center' }}>
                所有分组名称均不能为空
              </div>
            )}
            <button
              className="button"
              onClick={handleConfirm}
              disabled={!isAllValid}
              style={{ width: '100%', opacity: isAllValid ? 1 : 0.6 }}
            >
              完成
            </button>
          </div>
        </DialogContent>
      </Dialog>

      <AnimatePresence>
        {deleteConfirm && (
          <ConfirmModal
            title="删除确认"
            message={`确定要删除分组 "${deleteConfirm.name}" 吗？分组内的基金不会被删除。`}
            onConfirm={handleConfirmDelete}
            onCancel={() => setDeleteConfirm(null)}
          />
        )}
      </AnimatePresence>
    </>
  );
}