import { isLoginRequiredError } from '@_api/apiClient';
import {
    createThemeV2,
    deleteTheme,
    fetchAdminThemeDetail,
    updateTheme
} from '@_api/theme/themeAPI';
import { Difficulty, type ThemeCreateRequestV2, type ThemeUpdateRequest, type ThemeV2 } from '@_api/theme/themeTypes';
import React, { useEffect, useState } from 'react';
import { useLocation, useNavigate, useParams } from 'react-router-dom';
import '../../css/admin-theme-edit-page.css';

const AdminThemeEditPage: React.FC = () => {
    const { themeId } = useParams<{ themeId: string }>();
    const navigate = useNavigate();
    const location = useLocation();

    const isNew = themeId === 'new';

    const [theme, setTheme] = useState<ThemeV2 | ThemeCreateRequestV2 | null>(null);
    const [originalTheme, setOriginalTheme] = useState<ThemeV2 | ThemeCreateRequestV2 | null>(null);
    const [isLoading, setIsLoading] = useState(true);
    const [isEditing, setIsEditing] = useState(isNew);

    const handleError = (err: any) => {
        if (isLoginRequiredError(err)) {
            alert('로그인이 필요해요.');
            navigate('/login', { state: { from: location } });
        } else {
            const message = err.response?.data?.message || '알 수 없는 오류가 발생했습니다.';
            alert(message);
            console.error(err);
        }
    };

    useEffect(() => {
        if (isNew) {
            const newTheme: ThemeCreateRequestV2 = {
                name: '',
                description: '',
                thumbnailUrl: '',
                difficulty: Difficulty.NORMAL,
                price: 0,
                minParticipants: 2,
                maxParticipants: 4,
                availableMinutes: 60,
                expectedMinutesFrom: 50,
                expectedMinutesTo: 70,
                isOpen: true,
            };
            setTheme(newTheme);
            setOriginalTheme(newTheme);
            setIsLoading(false);
        } else if (themeId) {
            fetchAdminThemeDetail(themeId)
                .then(data => {
                    // Map AdminThemeDetailRetrieveResponse to ThemeV2
                    const fetchedTheme: ThemeV2 = {
                        id: data.id,
                        name: data.name,
                        description: data.description,
                        thumbnailUrl: data.thumbnailUrl,
                        difficulty: data.difficulty,
                        price: data.price,
                        minParticipants: data.minParticipants,
                        maxParticipants: data.maxParticipants,
                        availableMinutes: data.availableMinutes,
                        expectedMinutesFrom: data.expectedMinutesFrom,
                        expectedMinutesTo: data.expectedMinutesTo,
                        isOpen: data.isOpen,
                        createDate: data.createdAt, // Map createdAt to createDate
                        updatedDate: data.updatedAt, // Map updatedAt to updatedDate
                        createdBy: data.createdBy,
                        updatedBy: data.updatedBy,
                    };
                    setTheme(fetchedTheme);
                    setOriginalTheme(fetchedTheme);
                })
                .catch(handleError)
                .finally(() => setIsLoading(false));
        }
    }, [themeId, isNew, navigate]);

    const handleChange = (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement>) => {
        const { name, value, type } = e.target;
        let processedValue: string | number | boolean = value;

        if (name === 'isOpen') {
            processedValue = value === 'true';
        } else if (type === 'checkbox') {
            processedValue = (e.target as HTMLInputElement).checked;
        } else if (type === 'number') {
            processedValue = value === '' ? '' : Number(value);
        }

        setTheme(prev => prev ? { ...prev, [name]: processedValue } : null);
    };

    const handleCancelEdit = () => {
        if (!isNew) {
            setTheme(originalTheme);
            setIsEditing(false);
        } else {
            navigate('/admin/theme');
        }
    };

    const handleSubmit = async (e: React.FormEvent) => {
        console.log('handleSubmit called');
        e.preventDefault();
        if (!theme) return;

        try {
            if (isNew) {
                await createThemeV2(theme as ThemeCreateRequestV2);
                alert('테마가 성공적으로 생성되었습니다.');
                navigate(`/admin/theme`);
            } else {
                if (!themeId) {
                    throw new Error('themeId is undefined');
                }
                await updateTheme(themeId, theme as ThemeUpdateRequest);
                alert('테마가 성공적으로 업데이트되었습니다.');
                setOriginalTheme(theme);
                setIsEditing(false);
                navigate(`/admin/theme`);
            }
        } catch (error) {
            handleError(error);
        }
    };

    const handleDelete = async () => {
        if (isNew || !themeId) return;
        if (window.confirm('정말로 이 테마를 삭제하시겠습니까?')) {
            try {
                await deleteTheme(themeId);
                alert('테마가 삭제되었습니다.');
                navigate('/admin/theme');
            } catch (error) {
                handleError(error);
            }
        }
    };

    if (isLoading) {
        return <div className="admin-theme-edit-container"><p>로딩 중...</p></div>;
    }

    if (!theme) {
        return <div className="admin-theme-edit-container"><p>테마 정보를 찾을 수 없습니다.</p></div>;
    }

    return (
        <div className="admin-theme-edit-container">
            <div className="centered-layout">
                <header className="page-header">
                    <h2 className="page-title">{isNew ? '새 테마 추가' : '테마 정보 수정'}</h2>
                </header>
                <form onSubmit={handleSubmit} className="form-card">
                    <div className="form-section">
                        <div className="form-group full-width">
                            <label className="form-label" htmlFor="name">테마 이름</label>
                            <input id="name" name="name" type="text" className="form-input" value={theme.name} onChange={handleChange} required disabled={!isEditing} />
                        </div>
                        <div className="form-group full-width">
                            <label className="form-label" htmlFor="description">설명</label>
                            <textarea id="description" name="description" className="form-textarea" value={theme.description} onChange={handleChange} required disabled={!isEditing} />
                        </div>
                        <div className="form-group full-width">
                            <label className="form-label" htmlFor="thumbnailUrl">썸네일 URL</label>
                            <input id="thumbnailUrl" name="thumbnailUrl" type="text" className="form-input" value={theme.thumbnailUrl} onChange={handleChange} required disabled={!isEditing} />
                        </div>
                    </div>

                    <div className="form-section">
                        <div className="form-row">
                            <div className="form-group">
                                <label className="form-label" htmlFor="difficulty">난이도</label>
                                <select id="difficulty" name="difficulty" className="form-select" value={theme.difficulty} onChange={handleChange} disabled={!isEditing}>
                                    {Object.values(Difficulty).map(d => <option key={d} value={d}>{d}</option>)}
                                </select>
                            </div>
                            <div className="form-group">
                                <label className="form-label" htmlFor="isOpen">공개 여부</label>
                                <select id="isOpen" name="isOpen" className="form-select" value={String(theme.isOpen)} onChange={handleChange} disabled={!isEditing}>
                                    <option value="true">공개</option>
                                    <option value="false">비공개</option>
                                </select>
                            </div>
                        </div>


                        <div className="form-row">
                            <div className="form-group">
                                <label className="form-label" htmlFor="price">가격 (원)</label>
                                <input id="price" name="price" type="number" className="form-input" value={theme.price} onChange={handleChange} required disabled={!isEditing} />
                            </div>
                            <div className="form-group">
                                <label className="form-label" htmlFor="availableMinutes">총 이용시간 (분)</label>
                                <input id="availableMinutes" name="availableMinutes" type="number" className="form-input" value={theme.availableMinutes} onChange={handleChange} required disabled={!isEditing} />
                            </div>
                        </div>


                        <div className="form-row">
                            <div className="form-group">
                                <label className="form-label" htmlFor="expectedMinutesFrom">최소 예상 시간 (분)</label>
                                <input id="expectedMinutesFrom" name="expectedMinutesFrom" type="number" className="form-input" value={theme.expectedMinutesFrom} onChange={handleChange} required disabled={!isEditing} />
                            </div>
                            <div className="form-group">
                                <label className="form-label" htmlFor="expectedMinutesTo">최대 예상 시간 (분)</label>
                                <input id="expectedMinutesTo" name="expectedMinutesTo" type="number" className="form-input" value={theme.expectedMinutesTo} onChange={handleChange} required disabled={!isEditing} />
                            </div>
                        </div>

                        <div className="form-row">
                            <div className="form-group">
                                <label className="form-label" htmlFor="minParticipants">최소 인원 (명)</label>
                                <input id="minParticipants" name="minParticipants" type="number" className="form-input" value={theme.minParticipants} onChange={handleChange} required disabled={!isEditing} />
                            </div>
                            <div className="form-group">
                                <label className="form-label" htmlFor="maxParticipants">최대 인원 (명)</label>
                                <input id="maxParticipants" name="maxParticipants" type="number" className="form-input" value={theme.maxParticipants} onChange={handleChange} required disabled={!isEditing} />
                            </div>
                        </div>
                    </div>

                    <div className="button-group">
                        {isEditing ? (
                            <div className="main-actions">
                                <button type="button" className="btn btn-secondary" onClick={handleCancelEdit}>취소</button>
                                <button type="submit" className="btn btn-primary">저장</button>
                            </div>
                        ) : (
                            <div className="main-actions">
                                <button type="button" className="btn btn-secondary" onClick={() => navigate('/admin/theme')}>목록</button>
                                <button type="button" className="btn btn-primary" onClick={(e) => { e.preventDefault(); console.log('setIsEditing(true) called'); setIsEditing(true); }}>수정</button>
                            </div>
                        )}
                    </div>
                </form>

                {!isNew && 'id' in theme && (
                    <div className="audit-info">
                        <h4 className="audit-title">감사 정보</h4>
                        <div className="audit-body">
                            <p><strong>생성일:</strong> {new Date(theme.createDate).toLocaleString()}</p>
                            <p><strong>수정일:</strong> {new Date(theme.updatedDate).toLocaleString()}</p>
                            <p><strong>생성자:</strong> {theme.createdBy}</p>
                            <p><strong>수정자:</strong> {theme.updatedBy}</p>
                        </div>
                    </div>
                )}

                {!isNew && !isEditing && (
                    <div className="delete-section">
                        <button className="btn-delete-text" onClick={handleDelete}>이 테마를 삭제합니다.</button>
                    </div>
                )}
            </div>
        </div>
    );
};

export default AdminThemeEditPage;