// 聊天输入区完整逻辑：发送消息、草稿管理、IME 防重、神秘箱子暗号拦截。
// 从 Blade 内联脚本 scripts.blade.php 迁移至 Vite 模块。

let chatComposerEventsBound = false;

function csrf() {
    return document.querySelector('meta[name="csrf-token"]')?.content ?? "";
}

function getState() {
    return window.chatState;
}

function getDraftStorageKey() {
    return `chat_draft_${window.chatContext?.roomId ?? '0'}_${window.chatContext?.userId ?? '0'}`;
}

// ── 草稿管理 ──

function persistChatDraft(value = null) {
    try {
        const contentInput = document.getElementById("content");
        const draft = value ?? contentInput?.value ?? "";
        if (draft === "") {
            sessionStorage.removeItem(getDraftStorageKey());
            return;
        }
        sessionStorage.setItem(getDraftStorageKey(), draft);
    } catch (_) {
        // 会话存储不可用时静默降级
    }
}

function loadChatDraft() {
    try {
        return sessionStorage.getItem(getDraftStorageKey()) || "";
    } catch (_) {
        return "";
    }
}

// ── 消息发送 ──

/**
 * 将当前输入区状态整理为一份稳定快照。
 */
function collectChatComposerState() {
    const contentInput = document.getElementById("content");
    const submitBtn = document.getElementById("send-btn");
    const imageInput = document.getElementById("chat_image");
    const toUserSelect = document.getElementById("to_user");
    const actionSelect = document.getElementById("action");
    const fontColorInput = document.getElementById("font_color");
    const secretCheckbox = document.getElementById("is_secret");
    const contentRaw = contentInput?.value ?? "";
    const selectedImage = imageInput?.files?.[0] ?? null;

    return {
        contentInput,
        submitBtn,
        imageInput,
        contentRaw,
        content: contentRaw.trim(),
        selectedImage,
        toUser: toUserSelect?.value || "大家",
        action: actionSelect?.value || "",
        fontColor: fontColorInput?.value || "",
        isSecret: Boolean(secretCheckbox?.checked),
    };
}

/**
 * 基于当前聊天快照构造稳定的 multipart 请求体。
 */
function buildChatMessageFormData(composerState) {
    const formData = new FormData();
    formData.append("content", composerState.contentRaw);
    formData.append("to_user", composerState.toUser);
    formData.append("action", composerState.action);
    formData.append("font_color", composerState.fontColor);

    if (composerState.isSecret) {
        formData.append("is_secret", "1");
    }
    if (composerState.selectedImage) {
        formData.append("image", composerState.selectedImage);
    }

    return formData;
}

/**
 * 处理聊天图片选择后的前端状态展示。
 */
function handleChatImageSelected(input) {
    const file = input?.files?.[0] ?? null;
    if (!file) return;
    // 用户选择图片后，立即触发自动发送
    sendMessage(null);
}

/**
 * 清理当前选中的聊天图片。
 */
function clearSelectedChatImage(resetInput = false) {
    const imageInput = document.getElementById("chat_image");
    if (resetInput && imageInput) {
        imageInput.value = "";
    }
}

/**
 * 页面从后台恢复后，同步草稿、图片提示和发送锁状态。
 */
function syncChatComposerAfterResume() {
    const state = getState();
    const contentInput = document.getElementById("content");
    if (!contentInput) return;

    const savedDraft = loadChatDraft();
    if (contentInput.value === "" && savedDraft !== "") {
        contentInput.value = savedDraft;
    } else if (contentInput.value !== "") {
        persistChatDraft(contentInput.value);
    }

    const imageInput = document.getElementById("chat_image");
    if (!imageInput?.files?.length) {
        clearSelectedChatImage();
    }

    if (state) {
        state.imeComposing = false;
    }

    if (state && state.isSending && Date.now() - state.sendStartedAt > 15000) {
        const submitBtn = document.getElementById("send-btn");
        if (submitBtn) submitBtn.disabled = false;
        state.isSending = false;
        state.sendStartedAt = 0;
    }
}

/**
 * 发送聊天消息（内带防重入锁，避免快速连按 Enter 重复提交）。
 */
async function sendMessage(e) {
    if (e) e.preventDefault();

    const state = getState();
    if (state?.isSending) return;

    if (state) {
        state.isSending = true;
        state.sendStartedAt = Date.now();
    }

    // 前端禁言检查
    if (state && state.isMutedUntil > Date.now()) {
        const remaining = Math.ceil((state.isMutedUntil - Date.now()) / 1000);
        const remainMin = Math.ceil(remaining / 60);
        const muteDiv = document.createElement("div");
        muteDiv.className = "msg-line";
        muteDiv.innerHTML = `<span style="color: #dc2626; font-weight: bold;">【提示】您正在禁言中，还需等待约 ${remainMin} 分钟（${remaining} 秒）后方可发言。</span>`;
        const say2 = document.getElementById("say2");
        if (say2) {
            say2.appendChild(muteDiv);
            say2.scrollTop = say2.scrollHeight;
        }
        if (state) {
            state.isSending = false;
            state.sendStartedAt = 0;
        }
        return;
    }

    const composerState = collectChatComposerState();
    const { contentInput, submitBtn, content, contentRaw, selectedImage, toUser } = composerState;

    if (!content && !selectedImage) {
        contentInput?.focus();
        if (state) {
            state.isSending = false;
            state.sendStartedAt = 0;
        }
        return;
    }

    // AI 小助手私聊转发
    if (toUser === "AI小班长" && content && typeof window.sendToChatBot === "function") {
        window.sendToChatBot(content, composerState.isSecret);
    }

    // ── 神秘箱子暗号拦截 ──
    const passcodePattern = /^[A-Z0-9]{4,8}$/;
    if (!selectedImage && passcodePattern.test(content.trim())) {
        if (state) {
            state.isSending = false;
            state.sendStartedAt = 0;
        }

        try {
            const claimRes = await fetch("/mystery-box/claim", {
                method: "POST",
                headers: {
                    "X-CSRF-TOKEN": csrf(),
                    "Content-Type": "application/json",
                    "Accept": "application/json",
                },
                body: JSON.stringify({ passcode: content.trim() }),
            });
            const claimData = await claimRes.json();

            if (claimData.ok) {
                contentInput.value = "";
                persistChatDraft("");
                contentInput.focus();
                window._mysteryBoxActive = false;
                window._mysteryBoxPasscode = null;

                const isPositive = (claimData.reward ?? 1) >= 0;
                window.chatDialog?.alert(
                    claimData.message || "开箱成功！",
                    isPositive ? "🎉 恭喜！" : "☠️ 中了陷阱！",
                    isPositive ? "#10b981" : "#ef4444"
                );
                if (window.__chatUser && claimData.balance !== undefined) {
                    window.__chatUser.jjb = claimData.balance;
                }
                return;
            }
        } catch (_) {
            // 网络错误时静默回退正常发送
        }
    }

    submitBtn.disabled = true;
    const formData = buildChatMessageFormData({ ...composerState, contentRaw });

    try {
        const response = await fetch(window.chatContext.sendUrl, {
            method: "POST",
            headers: {
                "X-CSRF-TOKEN": csrf(),
                "Accept": "application/json",
            },
            body: formData,
        });

        const data = await response.json();
        if (response.ok && data.status === "success") {
            contentInput.value = "";
            persistChatDraft("");
            clearSelectedChatImage(true);
            contentInput.focus();
        } else {
            window.chatDialog?.alert(
                "发送失败: " + (data.message || JSON.stringify(data.errors)),
                "操作失败",
                "#cc4444"
            );
        }
    } catch (error) {
        window.chatDialog?.alert("网络连接错误，消息发送失败！", "网络错误", "#cc4444");
        console.error(error);
    } finally {
        submitBtn.disabled = false;
        if (state) {
            state.isSending = false;
            state.sendStartedAt = 0;
        }
    }
}

// ── 事件绑定 ──

/**
 * 绑定聊天输入区的所有事件：submit、IME、keydown、草稿、焦点恢复。
 */
export function bindChatComposerControls() {
    if (chatComposerEventsBound || typeof document === "undefined") {
        return;
    }
    chatComposerEventsBound = true;

    // 表单提交
    document.addEventListener("submit", (event) => {
        const form = event.target;
        if (!(form instanceof HTMLFormElement) || !form.matches("[data-chat-form]")) {
            return;
        }
        event.preventDefault();
        if (typeof window.sendMessage === "function") {
            void window.sendMessage(event);
        }
    });

    // 输入框事件绑定
    const contentInput = document.getElementById("content");
    if (contentInput) {
        contentInput.addEventListener("input", function () {
            persistChatDraft(this.value);
        });

        // IME 组词开始
        contentInput.addEventListener("compositionstart", () => {
            const state = getState();
            if (state) state.imeComposing = true;
        });

        // IME 组词结束
        contentInput.addEventListener("compositionend", () => {
            setTimeout(() => {
                const state = getState();
                if (state) state.imeComposing = false;
            }, 10);
        });

        // Enter 发送
        contentInput.addEventListener("keydown", function (e) {
            if (e.key === "Enter" && !e.shiftKey) {
                e.preventDefault();
                const state = getState();
                if (state?.imeComposing) return;
                sendMessage(e);
            }
        });
    }

    // 页面恢复事件
    syncChatComposerAfterResume();
    window.addEventListener("pageshow", syncChatComposerAfterResume);
    document.addEventListener("visibilitychange", function () {
        if (document.visibilityState === "visible") {
            syncChatComposerAfterResume();
        }
    });
    window.addEventListener("focus", function () {
        setTimeout(syncChatComposerAfterResume, 0);
    });
}

/**
 * 设置聊天动作并把焦点带回输入框。
 */
export function setChatComposerAction(
    action,
    switchTabHandler = typeof window !== "undefined" ? window.switchTab : null,
) {
    const actionSelect = document.getElementById("action");
    const contentInput = document.getElementById("content");

    if (actionSelect) {
        actionSelect.value = action;
    }

    if (typeof switchTabHandler === "function") {
        switchTabHandler("users");
    }

    if (contentInput) {
        contentInput.focus();
    }
}

// ── 挂载到 window ──
window.sendMessage = sendMessage;
window.handleChatImageSelected = handleChatImageSelected;
window.collectChatComposerState = collectChatComposerState;
window.buildChatMessageFormData = buildChatMessageFormData;
window.clearSelectedChatImage = clearSelectedChatImage;
window.persistChatDraft = persistChatDraft;
window.loadChatDraft = loadChatDraft;
window.syncChatComposerAfterResume = syncChatComposerAfterResume;

export { sendMessage, handleChatImageSelected, clearSelectedChatImage, collectChatComposerState, buildChatMessageFormData };