// js/app.js - 主应用入口

import { state } from './state.js';
import { api } from './api.js';
import { theme, activateNav } from './common.js';
import { notification } from './notifications.js';
import { initCaddyStatus } from './caddy.js';
import { DOMElements, switchView, renderConfigList, addKeyValueInput, addSingleInput, fillForm, showRenderedConfig, updateCaddyStatusView, updateSegmentedControl, updateServiceModeView, updateMultiUpstreamView, createPresetSelectionModal } from './ui.js';

const POLLING_INTERVAL = 5000;
let caddyStatusInterval;

function getFormStateAsString() {
    const formData = new FormData(DOMElements.configForm);
    const data = {};
    const activeModeButton = DOMElements.serviceModeControl.querySelector('button.active');
    data.active_mode = activeModeButton ? activeModeButton.dataset.mode : 'none';
    for (const [key, value] of formData.entries()) {
        const el = DOMElements.configForm.querySelector(`[name="${key}"]`);
        if (el?.type === 'checkbox') data[key] = el.checked;
        else if (data[key]) {
            if (!Array.isArray(data[key])) data[key] = [data[key]];
            data[key].push(value);
        } else data[key] = value;
    }
    return JSON.stringify(data);
}

async function attemptExitForm() {
    if (getFormStateAsString() !== state.initialFormState) {
        if (await notification.confirm('您有未保存的更改。确定要放弃吗？')) switchView(DOMElements.configListPanel);
    } else switchView(DOMElements.configListPanel);
}

async function handleLogout() {
    if (!await notification.confirm('您确定要退出登录吗?')) return;
    notification.toast('正在退出...', 'info');
    setTimeout(() => { window.location.href = `/v0/api/auth/logout`; }, 500);
}

async function loadAllConfigs() {
    try {
        const filenames = await api.get('/config/filenames');
        renderConfigList(filenames);
    } catch (error) { if (error.message) notification.toast(`加载配置列表失败: ${error.message}`, 'error'); }
}

async function handleEditConfig(originalFilename) {
    try {
        const [config, rendered] = await Promise.all([
            api.get(`/config/file/${originalFilename}`),
            api.get('/config/files/rendered')
        ]);
        state.isEditing = true;
        switchView(DOMElements.configFormPanel);
        DOMElements.formTitle.textContent = '编辑配置';
        fillForm(config, originalFilename);
        showRenderedConfig(rendered, originalFilename);
        const mode = config.upstream_config?.enable_upstream ? 'reverse_proxy' : (config.file_server_config?.enable_file_server ? 'file_server' : 'none');
        updateServiceModeView(mode);
        state.initialFormState = getFormStateAsString();
    } catch (error) { notification.toast(`加载配置详情失败: ${error.message}`, 'error'); }
}

async function handleDeleteConfig(filename) {
    if (!await notification.confirm(`确定要删除配置 "${filename}" 吗？`)) return;
    try {
        await api.delete(`/config/file/${filename}`);
        notification.toast('配置已成功删除。', 'success');
        loadAllConfigs();
    } catch (error) { notification.toast(`删除失败: ${error.message}`, 'error'); }
}

async function handleSaveConfig(e) {
    e.preventDefault();
    const formData = new FormData(DOMElements.configForm);
    const domain = formData.get('domain');
    if (!domain) {
        notification.toast('域名不能为空。', 'error');
        return;
    }
    const getHeadersMap = (keyName, valueName) => {
        const headers = {};
        formData.getAll(keyName).forEach((key, i) => {
            if (key) {
                if (!headers[key]) headers[key] = [];
                headers[key].push(formData.getAll(valueName)[i]);
            }
        });
        return headers;
    };
    const activeModeButton = DOMElements.serviceModeControl.querySelector('button.active');
    const activeMode = activeModeButton ? activeModeButton.dataset.mode : 'none';
    const isMutiUpstream = DOMElements.mutiUpstreamCheckbox.checked;

    const configData = {
        mode: "uni",
        domain_config: { domain: domain, muti_domains: false, domains: [] },
        upstream_config: {
            enable_upstream: activeMode === 'reverse_proxy',
            upstream: formData.get('upstream'),
            muti_upstream: isMutiUpstream,
            upstream_servers: formData.getAll('upstream_servers').filter(s => s),
            upstream_headers: getHeadersMap('upstream_header_key', 'upstream_header_value'),
        },
        file_server_config: {
            enable_file_server: activeMode === 'file_server',
            file_dir_path: formData.get('file_dir_path'),
            enable_browser: DOMElements.configForm.querySelector('#enable_browser').checked
        },
        headers: getHeadersMap('header_key', 'header_value'),
        log_config: { enable_log: DOMElements.configForm.querySelector('#enable_log').checked, log_domain: domain },
        error_page_config: { enable_error_page: DOMElements.configForm.querySelector('#enable_error_page').checked },
        encode_config: { enable_encode: DOMElements.configForm.querySelector('#enable_encode').checked }
    };
    try {
        const result = await api.put(`/config/file/${domain}`, configData);
        state.isEditing = false;
        notification.toast(result.message || '配置已成功保存。', 'success');
        setTimeout(() => {
            switchView(DOMElements.configListPanel);
            loadAllConfigs();
        }, 500);
    } catch (error) { notification.toast(`保存失败: ${error.message}`, 'error'); }
}

async function openPresetModal(targetType) {
    const applicablePresets = state.headerPresets.filter(p => p.target === targetType || p.target === 'any');
    if (applicablePresets.length === 0) {
        notification.toast(`没有适用于此区域的预设。`, 'info');
        return;
    }

    const presetId = await createPresetSelectionModal(applicablePresets);
    if (!presetId) return; // 用户取消了选择

    let targetContainer, keyName, valueName;
    if (targetType === 'global') {
        targetContainer = DOMElements.headersContainer;
        keyName = 'header_key';
        valueName = 'header_value';
    } else if (targetType === 'upstream') {
        targetContainer = DOMElements.upstreamHeadersContainer;
        keyName = 'upstream_header_key';
        valueName = 'upstream_header_value';
    } else {
        return;
    }

    // 在获取到presetId后，再执行填充逻辑
    try {
        notification.toast('正在加载预设...', 'info', 1000);
        const preset = await api.get(`/config/headers-presets/${presetId}`);
        if (!preset.headers) {
            notification.toast('此预设无数据。', 'info');
            return;
        }

        const choice = await notification.confirm('如何填充预设？', '选择填充方式', { confirmText: '追加', cancelText: '替换' });

        if (choice === false) { // 用户选择了“替换”
            targetContainer.innerHTML = '';
        }

        Object.entries(preset.headers).forEach(([key, values]) => {
            values.forEach(value => {
                addKeyValueInput(targetContainer, keyName, valueName, key, value);
            });
        });
        notification.toast(`已成功填充预设 "${preset.name}"`, 'success');

    } catch (error) {
        notification.toast(`加载预设失败: ${error.message}`, 'error');
    }
}

function init() {
    theme.init(DOMElements.themeToggleInput);
    notification.init(DOMElements.toastContainer, DOMElements.dialogContainer, DOMElements.modalContainer);
    activateNav('configs');
    initCaddyStatus();

    loadAllConfigs();

    api.get('/config/headers-presets')
        .then(presets => {
            state.headerPresets = presets || [];
        })
        .catch(err => {
            if (err.message) notification.toast(`加载Header预设失败: ${err.message}`, 'error');
        });

    DOMElements.menuToggleBtn.addEventListener('click', () => DOMElements.sidebar.classList.toggle('is-open'));
    DOMElements.mainContent.addEventListener('click', () => DOMElements.sidebar.classList.remove('is-open'));

    DOMElements.addNewConfigBtn.addEventListener('click', () => {
        state.isEditing = false;
        switchView(DOMElements.configFormPanel);
        DOMElements.formTitle.textContent = '创建新配置';
        DOMElements.configForm.reset();

        const noneButton = DOMElements.serviceModeControl.querySelector('[data-mode="none"]');
        if (noneButton) updateSegmentedControl(noneButton);
        updateServiceModeView('none');
        updateMultiUpstreamView(false);

        state.initialFormState = getFormStateAsString();
        DOMElements.headersContainer.innerHTML = '';
        DOMElements.upstreamHeadersContainer.innerHTML = '';
        DOMElements.multiUpstreamContainer.innerHTML = '';
        DOMElements.originalFilenameInput.value = '';
    });

    DOMElements.backToListBtn.addEventListener('click', attemptExitForm);
    DOMElements.cancelEditBtn.addEventListener('click', attemptExitForm);

    DOMElements.configForm.addEventListener('submit', handleSaveConfig);
    DOMElements.logoutBtn.addEventListener('click', handleLogout);

    DOMElements.configListContainer.addEventListener('click', e => {
        const button = e.target.closest('button');
        if (!button) return;
        const filename = button.closest('.config-item').dataset.filename;
        if (button.classList.contains('edit-btn')) handleEditConfig(filename);
        if (button.classList.contains('delete-btn')) handleDeleteConfig(filename);
    });

    DOMElements.configForm.querySelector('button[data-add-target="global"]').addEventListener('click', (e) => {
        e.preventDefault();
        addKeyValueInput(DOMElements.headersContainer, 'header_key', 'header_value');
    });

    DOMElements.configForm.querySelector('button[data-add-target="upstream"]').addEventListener('click', (e) => {
        e.preventDefault();
        addKeyValueInput(DOMElements.upstreamHeadersContainer, 'upstream_header_key', 'upstream_header_value');
    });

    DOMElements.configForm.querySelector('button[data-preset-target="global"]').addEventListener('click', (e) => {
        e.preventDefault();
        openPresetModal('global');
    });

    DOMElements.configForm.querySelector('button[data-preset-target="upstream"]').addEventListener('click', (e) => {
        e.preventDefault();
        openPresetModal('upstream');
    });

    DOMElements.addMultiUpstreamBtn.addEventListener('click', (e) => {
        e.preventDefault();
        addSingleInput(DOMElements.multiUpstreamContainer, 'upstream_servers', '例如: 127.0.0.1:8081');
    });

    DOMElements.serviceModeControl.addEventListener('click', (e) => {
        const button = e.target.closest('button');
        if (button) {
            e.preventDefault();
            const mode = button.dataset.mode;
            updateSegmentedControl(button);
            updateServiceModeView(mode);
        }
    });

    DOMElements.mutiUpstreamCheckbox.addEventListener('change', (e) => {
        updateMultiUpstreamView(e.target.checked);
    });
}

init();