let isEditing = false;
const RESERVATION_API_ENDPOINT = '/reservations';
const TIME_API_ENDPOINT = '/times';
const THEME_API_ENDPOINT = '/themes';
const MEMBER_API_ENDPOINT = '/members';
const timesOptions = [];
const themesOptions = [];
const membersOptions = [];

document.addEventListener('DOMContentLoaded', () => {
    document.getElementById('add-button').addEventListener('click', addInputRow);
    document.getElementById('filter-form').addEventListener('submit', applyFilter);

    requestRead(RESERVATION_API_ENDPOINT)
        .then(render)
        .catch(error => console.error('Error fetching reservations:', error));

    fetchTimes();
    fetchThemes();
    fetchMembers();
});

function render(data) {
    const tableBody = document.getElementById('table-body');
    tableBody.innerHTML = '';

    data.data.reservations.forEach(item => {
        const row = tableBody.insertRow();
        const isPaid = item.status === 'CONFIRMED' ? '결제 완료' : '결제 대기';

        row.insertCell(0).textContent = item.id;              // 예약 id
        row.insertCell(1).textContent = item.member.name;     // 사용자 name
        row.insertCell(2).textContent = item.theme.name;      // 테마 name
        row.insertCell(3).textContent = item.date;            // date
        row.insertCell(4).textContent = item.time.startAt;    // 예약 시간 startAt
        row.insertCell(5).textContent = isPaid;               // 결제

        const actionCell = row.insertCell(row.cells.length);
        actionCell.appendChild(createActionButton('삭제', 'btn-danger', deleteRow));
    });
}

function fetchTimes() {
    requestRead(TIME_API_ENDPOINT)
        .then(data => {
            timesOptions.push(...data.data.times);
        })
        .catch(error => console.error('Error fetching time:', error));
}

function fetchThemes() {
    requestRead(THEME_API_ENDPOINT)
        .then(data => {
            themesOptions.push(...data.data.themes);
            populateSelect('theme', themesOptions, 'name');
        })
        .catch(error => console.error('Error fetching theme:', error));
}

function fetchMembers() {
    requestRead(MEMBER_API_ENDPOINT)
        .then(data => {
            membersOptions.push(...data.data.members);
            populateSelect('member', membersOptions, 'name');
        })
        .catch(error => console.error('Error fetching member:', error));
}

function populateSelect(selectId, options, textProperty) {
    const select = document.getElementById(selectId);
    options.forEach(optionData => {
        const option = document.createElement('option');
        option.value = optionData.id;
        option.textContent = optionData[textProperty];
        select.appendChild(option);
    });
}

function createSelect(options, defaultText, selectId, textProperty) {
    const select = document.createElement('select');
    select.className = 'form-control';
    select.id = selectId;

    // 기본 옵션 추가
    const defaultOption = document.createElement('option');
    defaultOption.textContent = defaultText;
    select.appendChild(defaultOption);

    // 넘겨받은 옵션을 바탕으로 드롭다운 메뉴 아이템 생성
    options.forEach(optionData => {
        const option = document.createElement('option');
        option.value = optionData.id;
        option.textContent = optionData[textProperty]; // 동적 속성 접근
        select.appendChild(option);
    });

    return select;
}

function createActionButton(label, className, eventListener) {
    const button = document.createElement('button');
    button.textContent = label;
    button.classList.add('btn', className, 'mr-2');
    button.addEventListener('click', eventListener);
    return button;
}

function addInputRow() {
    if (isEditing) return;  // 이미 편집 중인 경우 추가하지 않음

    const tableBody = document.getElementById('table-body');
    const row = tableBody.insertRow();
    isEditing = true;

    const dateInput = createInput('date');
    const timeDropdown = createSelect(timesOptions, "시간 선택", 'time-select', 'startAt');
    const themeDropdown = createSelect(themesOptions, "테마 선택", 'theme-select', 'name');
    const memberDropdown = createSelect(membersOptions, "멤버 선택", 'member-select', 'name');

    const cellFieldsToCreate = ['', memberDropdown, themeDropdown, dateInput, timeDropdown];

    cellFieldsToCreate.forEach((field, index) => {
        const cell = row.insertCell(index);
        if (typeof field === 'string') {
            cell.textContent = field;
        } else {
            cell.appendChild(field);
        }
    });

    const actionCell = row.insertCell(row.cells.length);
    actionCell.appendChild(createActionButton('확인', 'btn-custom', saveRow));
    actionCell.appendChild(createActionButton('취소', 'btn-secondary', () => {
        row.remove();
        isEditing = false;
    }));
}

function createInput(type) {
    const input = document.createElement('input');
    input.type = type;
    input.className = 'form-control';
    return input;
}

function createActionButton(label, className, eventListener) {
    const button = document.createElement('button');
    button.textContent = label;
    button.classList.add('btn', className, 'mr-2');
    button.addEventListener('click', eventListener);
    return button;
}

function saveRow(event) {
    // 이벤트 전파를 막는다
    event.stopPropagation();

    const row = event.target.parentNode.parentNode;
    const dateInput = row.querySelector('input[type="date"]');
    const memberSelect = row.querySelector('#member-select');
    const themeSelect = row.querySelector('#theme-select');
    const timeSelect = row.querySelector('#time-select');

    const reservation = {
        date: dateInput.value,
        themeId: themeSelect.value,
        timeId: timeSelect.value,
        memberId: memberSelect.value,
    };

    requestCreate(reservation)
        .then(() => {
            location.reload();
        })
        .catch(error => console.error('Error:', error));

    isEditing = false;  // isEditing 값을 false로 설정
}

function deleteRow(event) {
    const row = event.target.closest('tr');
    const reservationId = row.cells[0].textContent;

    requestDelete(reservationId)
        .then(() => row.remove())
        .catch(error => console.error('Error:', error));
}

function applyFilter(event) {
    event.preventDefault();

    const themeId = document.getElementById('theme').value;
    const memberId = document.getElementById('member').value;
    const dateFrom = document.getElementById('date-from').value;
    const dateTo = document.getElementById('date-to').value;

    const queryParams = {
        themeId: themeId,
        memberId: memberId,
        dateFrom: dateFrom,
        dateTo: dateTo
    }
    const searchParams = new URLSearchParams(queryParams);
    const endpoint = '/reservations/search';

    const url = `${endpoint}?${searchParams.toString()}`;
    fetch(url, { // 예약 검색 API 호출
        method: 'GET',
        headers: {
            'Content-Type': 'application/json'
        },
    }).then(response => {
        if (response.status === 200) return response.json();
        throw new Error('Read failed');
    }).then(render)
        .catch(error => console.error("Error fetching available times:", error));
}

function requestCreate(reservation) {
    const requestOptions = {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify(reservation)
    };

    return fetch('/reservations/admin', requestOptions)
        .then(response => {
            if (response.status === 201) return response.json();
            throw new Error('Create failed');
        });
}

function requestDelete(id) {
    const requestOptions = {
        method: 'DELETE',
    };

    return fetch(`${RESERVATION_API_ENDPOINT}/${id}`, requestOptions)
        .then(response => {
            if (response.status !== 204) throw new Error('Delete failed');
        });
}

function requestRead(endpoint) {
    return fetch(endpoint)
        .then(response => {
            if (response.status === 200) return response.json();
            throw new Error('Read failed');
        });
}