// custom javascript here

const MAX_HISTORY_LENGTH = 32;

var key_down_history = [];
var currentIndex = -1;
var user_input_ta;

var gradioContainer = null;
var user_input_ta = null;
var user_input_tb = null;
var userInfoDiv = null;
var appTitleDiv = null;
var chatbot = null;

var ga = document.getElementsByTagName("gradio-app");
var targetNode = ga[0];
var isInIframe = (window.self !== window.top);

// gradio 页面加载好了么??? 我能动你的元素了么??
function gradioLoaded(mutations) {
    for (var i = 0; i < mutations.length; i++) {
        if (mutations[i].addedNodes.length) {  
            gradioContainer = document.querySelector(".gradio-container");
            user_input_tb = document.getElementById('user_input_tb');
            userInfoDiv = document.getElementById("user_info");
            appTitleDiv = document.getElementById("app_title");
            chatbot = document.querySelector('#chuanhu_chatbot');

            if (gradioContainer) {  // gradioCainter 加载出来了没?
                adjustDarkMode();
            }
            if (user_input_tb) {  // user_input_tb 加载出来了没?
                selectHistory();
            }
            if (userInfoDiv && appTitleDiv) {  // userInfoDiv 和 appTitleDiv 加载出来了没?
                setTimeout(showOrHideUserInfo(), 2000);
            }
            if (chatbot) {  // chatbot 加载出来了没?
                setChatbotHeight()
            }
        }
    }
}

function selectHistory() {
    user_input_ta = user_input_tb.querySelector("textarea");
    if (user_input_ta) {
        observer.disconnect(); // 停止监听
        // 在 textarea 上监听 keydown 事件
        user_input_ta.addEventListener("keydown", function (event) {
            var value = user_input_ta.value.trim();
            // 判断按下的是否为方向键
            if (event.code === 'ArrowUp' || event.code === 'ArrowDown') {
                // 如果按下的是方向键，且输入框中有内容，且历史记录中没有该内容，则不执行操作
                if (value && key_down_history.indexOf(value) === -1)
                    return;
                // 对于需要响应的动作，阻止默认行为。
                event.preventDefault();
                var length = key_down_history.length;
                if (length === 0) {
                    currentIndex = -1; // 如果历史记录为空，直接将当前选中的记录重置
                    return;
                }
                if (currentIndex === -1) {
                    currentIndex = length;
                }
                if (event.code === 'ArrowUp' && currentIndex > 0) {
                    currentIndex--;
                    user_input_ta.value = key_down_history[currentIndex];
                } else if (event.code === 'ArrowDown' && currentIndex < length - 1) {
                    currentIndex++;
                    user_input_ta.value = key_down_history[currentIndex];
                }
                user_input_ta.selectionStart = user_input_ta.value.length;
                user_input_ta.selectionEnd = user_input_ta.value.length;
                const input_event = new InputEvent("input", { bubbles: true, cancelable: true });
                user_input_ta.dispatchEvent(input_event);
            } else if (event.code === "Enter") {
                if (value) {
                    currentIndex = -1;
                    if (key_down_history.indexOf(value) === -1) {
                        key_down_history.push(value);
                        if (key_down_history.length > MAX_HISTORY_LENGTH) {
                            key_down_history.shift();
                        }
                    }
                }
            }
        });
    }
}

function toggleUserInfoVisibility(shouldHide) {
    if (userInfoDiv) {
        if (shouldHide) {
            userInfoDiv.classList.add("hideK");
        } else {
            userInfoDiv.classList.remove("hideK");
        }
    }
}
function showOrHideUserInfo() {
    var sendBtn = document.getElementById("submit_btn");

    // Bind mouse/touch events to show/hide user info
    appTitleDiv.addEventListener("mouseenter", function () {
        toggleUserInfoVisibility(false);
    });
    userInfoDiv.addEventListener("mouseenter", function () {
        toggleUserInfoVisibility(false);
    });
    sendBtn.addEventListener("mouseenter", function () {
        toggleUserInfoVisibility(false);
    });

    appTitleDiv.addEventListener("mouseleave", function () {
        toggleUserInfoVisibility(true);
    });
    userInfoDiv.addEventListener("mouseleave", function () {
        toggleUserInfoVisibility(true);
    });
    sendBtn.addEventListener("mouseleave", function () {
        toggleUserInfoVisibility(true);
    });

    appTitleDiv.ontouchstart = function () {
        toggleUserInfoVisibility(false);
    };
    userInfoDiv.ontouchstart = function () {
        toggleUserInfoVisibility(false);
    };
    sendBtn.ontouchstart = function () {
        toggleUserInfoVisibility(false);
    };

    appTitleDiv.ontouchend = function () {
        setTimeout(function () {
            toggleUserInfoVisibility(true);
        }, 3000); 
    };
    userInfoDiv.ontouchend = function () {
        setTimeout(function () {
            toggleUserInfoVisibility(true);
        }, 3000); 
    };
    sendBtn.ontouchend = function () {
        setTimeout(function () {
            toggleUserInfoVisibility(true);
        }, 3000); // Delay 1 second to hide user info
    };

    // Hide user info after 2 second
    setTimeout(function () {
        toggleUserInfoVisibility(true);
    }, 2000);
}

function toggleDarkMode(isEnabled) {
    gradioContainer = document.querySelector(".gradio-container");
    if (isEnabled) {
        gradioContainer.classList.add("dark");
        document.body.style.backgroundColor = "";
    } else {
        gradioContainer.classList.remove("dark");
    }
}
function adjustDarkMode() {
    const darkModeQuery = window.matchMedia("(prefers-color-scheme: dark)");
    // 根据当前颜色模式设置初始状态
    toggleDarkMode(darkModeQuery.matches);
    // 监听颜色模式变化
    darkModeQuery.addEventListener("change", (e) => {
        toggleDarkMode(e.matches);
    });
}

function setChatbotHeight() {
    const screenWidth = window.innerWidth;
    const statusDisplay = document.querySelector('#status_display');
    const statusDisplayHeight = statusDisplay ? statusDisplay.offsetHeight : 0;
    const wrap = chatbot.querySelector('.wrap');
    const vh = window.innerHeight * 0.01;
    document.documentElement.style.setProperty('--vh', `${vh}px`);
    if (isInIframe) {
        chatbot.style.height = `700px`;
        wrap.style.maxHeight = `calc(700px - var(--line-sm) * 1rem - 2 * var(--block-label-margin))`
    } else {
        if (screenWidth <= 320) {
            chatbot.style.height = `calc(var(--vh, 1vh) * 100 - ${statusDisplayHeight + 150}px)`;
            wrap.style.maxHeight = `calc(var(--vh, 1vh) * 100 - ${statusDisplayHeight + 150}px - var(--line-sm) * 1rem - 2 * var(--block-label-margin))`;
        } else if (screenWidth <= 499) {
            chatbot.style.height = `calc(var(--vh, 1vh) * 100 - ${statusDisplayHeight + 100}px)`;
            wrap.style.maxHeight = `calc(var(--vh, 1vh) * 100 - ${statusDisplayHeight + 100}px - var(--line-sm) * 1rem - 2 * var(--block-label-margin))`;
        } else {
            chatbot.style.height = `calc(var(--vh, 1vh) * 100 - ${statusDisplayHeight + 160}px)`;
            wrap.style.maxHeight = `calc(var(--vh, 1vh) * 100 - ${statusDisplayHeight + 160}px - var(--line-sm) * 1rem - 2 * var(--block-label-margin))`;
        }
    }
}

// 监视页面内部 DOM 变动
var observer = new MutationObserver(function (mutations) {
    gradioLoaded(mutations);
});
observer.observe(targetNode, { childList: true, subtree: true });

// 监视页面变化
window.addEventListener("DOMContentLoaded", function () {
    isInIframe = (window.self !== window.top);
});
window.addEventListener('resize', setChatbotHeight);
window.addEventListener('scroll', setChatbotHeight);
window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", adjustDarkMode);