const LLM_TOKEN_EXPIRE_MS = 23 * 60 * 60 * 1000;

async function resolveJumpLinks(titles) {
    if (!titles || titles.length === 0) return {};

    const config = await loadMergedConfig();
    const filePathCfg = config.apiConfig.filePath;
    const publicBase = config.apiConfig.materialPublicUrl.url;
    const reqField = filePathCfg.requestParams[0].field;
    const respField = filePathCfg.responseParams[0].field;

    return new Promise((resolveOuter) => {
        chrome.storage.local.get(["token"], async (res) => {
            const token = res.token;
            if (!token) return resolveOuter({});
            try {
                const body = {};
                body[reqField] = titles;
                const resp = await fetch(filePathCfg.url, {
                    method: "POST",
                    headers: {
                        "Content-Type": "application/json",
                        "Authorization": token
                    },
                    body: JSON.stringify(body)
                });

                const data = await resp.json();
                const fileMap = data[respField] || {};
                const map = {};
                for (const title of Object.keys(fileMap)) {
                    if (fileMap[title]) {
                        const cleanPath = fileMap[title].replace(/\.md$/, ".html");
                        map[title] = `${publicBase}/${cleanPath}`;
                    }
                }
                resolveOuter(map);
            } catch (e) {
                resolveOuter({});
            }
        });
    });
}


async function renderSources(sourceList, sources, jumpMap) {
    sourceList.style.marginTop = "12px";
    sourceList.style.borderTop = "1px solid #dbe3f3";
    sourceList.style.paddingTop = "7px";

    const titleBar = document.createElement("div");
    titleBar.textContent = "📎 参考资料";
    titleBar.style.fontWeight = "bold";
    titleBar.style.marginBottom = "6px";
    titleBar.style.fontSize = "13.5px";
    titleBar.style.color = "#0d2fec";
    sourceList.appendChild(titleBar);

    // ul 包裹所有参考资料
    const ul = document.createElement("ul");
    ul.style.paddingLeft = "1.2em";
    ul.style.margin = "0";
    ul.style.listStyle = "disc";
    ul.style.fontSize = "14px";

    for (const src of sources) {
        const url = jumpMap[src.title];
        const li = document.createElement("li");
        li.style.marginBottom = "3px";
        li.style.lineHeight = "1.7";

        let scoreText = "";
        if (typeof src.score === "number") {
            scoreText = `（相似度：${(src.score * 100).toFixed(2)}%）`;
        }

        if (url) {
            const link = document.createElement("a");
            link.href = url;
            link.textContent = src.title || "未命名文档";
            link.target = "_blank";
            link.style.color = "#2560de";
            link.style.textDecoration = "none";
            link.onmouseenter = () => (link.style.textDecoration = "underline");
            link.onmouseleave = () => (link.style.textDecoration = "none");
            li.appendChild(link);

            if (scoreText) {
                const scoreSpan = document.createElement("span");
                scoreSpan.style.color = "#8990a1";
                scoreSpan.style.fontSize = "12.5px";
                scoreSpan.style.marginLeft = "6px";
                scoreSpan.textContent = scoreText;
                li.appendChild(scoreSpan);
            }
        } else {
            li.textContent = (src.title || "未命名文档") + (scoreText ? " " + scoreText : "");
            li.style.color = "#666";
        }

        ul.appendChild(li);
    }
    sourceList.appendChild(ul);
}

// === 复制代码块功能 ===
function wrapHtmlWithCopyBtn(html) {
    const wrapper = document.createElement('div');
    wrapper.innerHTML = html;
    wrapper.querySelectorAll('pre > code').forEach(codeEl => {
        const pre = codeEl.parentElement;
        if (pre.querySelector('.copy-btn')) return;
        const btn = document.createElement('button');
        btn.className = 'copy-btn';
        btn.innerText = '复制';
        pre.appendChild(btn);
        pre.style.position = 'relative';
    });
    return wrapper.innerHTML;
}

function bindAllCopyButtons(container) {
    (container || document).querySelectorAll('.llm-md .copy-btn').forEach(btn => {
        if (btn.dataset.bind === "true") return;
        btn.dataset.bind = "true";
        btn.addEventListener('click', function (e) {
            e.stopPropagation();
            const codeEl = btn.parentElement.querySelector('code');
            const codeText = codeEl ? (codeEl.innerText || codeEl.textContent) : "";
            let success = false, error = null;
            try {
                const textarea = document.createElement("textarea");
                textarea.value = codeText;
                textarea.setAttribute('readonly', '');
                textarea.style.position = "absolute";
                textarea.style.left = "-9999px";
                document.body.appendChild(textarea);
                textarea.select();
                success = document.execCommand('copy');
                document.body.removeChild(textarea);
                if (success) {
                    btn.innerText = '已复制!';
                    setTimeout(() => btn.innerText = '复制', 1200);
                } else {
                    btn.innerText = '失败';
                    setTimeout(() => btn.innerText = '复制', 1200);
                }
            } catch (err) {
                error = err;
                btn.innerText = '失败';
                setTimeout(() => btn.innerText = '复制', 1200);
            }
            if (!success) {
                alert("复制失败: " + (error ? error : "未知错误"));
            }
        });
    });
}

function insertCopyFullAnswerBtn(msgBox, answerStr) {
    if (msgBox.querySelector('.copy-full-answer-btn')) return;

    const copyBtn = document.createElement('button');
    copyBtn.className = 'copy-full-answer-btn';
    copyBtn.innerText = '复制全部回答';
    copyBtn.style.margin = "12px 0 0 0";
    copyBtn.style.display = "block";
    copyBtn.style.background = "#eef1f9";
    copyBtn.style.color = "#2d53a7";
    copyBtn.style.border = "1px solid #dde4ef";
    copyBtn.style.borderRadius = "6px";
    copyBtn.style.padding = "5px 18px";
    copyBtn.style.fontSize = "13.2px";
    copyBtn.style.cursor = "pointer";
    copyBtn.style.float = "right";
    copyBtn.style.position = "relative";
    copyBtn.style.right = "0";
    copyBtn.style.transition = "background 0.13s";
    copyBtn.onmouseenter = () => (copyBtn.style.background = "#dbeafe");
    copyBtn.onmouseleave = () => (copyBtn.style.background = "#eef1f9");

    copyBtn.onclick = () => {
        // 1. 回答正文
        let answerText = (answerStr || "").trim();

        // 2. 参考资料 markdown（遍历 ul/li/a）
        let refArr = [];
        const ul = msgBox.querySelector('.llm-sources ul');
        if (ul) {
            ul.querySelectorAll('li').forEach(li => {
                let link = li.querySelector('a');
                let title = link ? link.textContent : li.textContent;
                let url = link ? link.getAttribute('href') : "";
                // 分值（span）
                let scoreSpan = li.querySelector('span');
                let scoreText = scoreSpan ? scoreSpan.textContent : "";
                refArr.push(`- [${title}](${url})${scoreText}`);
            });
        }
        let refText = "";
        if (refArr.length > 0) {
            refText = "\n\n参考资料：\n" + refArr.join("\n");
        }
        const textToCopy = answerText + refText;

        try {
            const textarea = document.createElement("textarea");
            textarea.value = textToCopy;
            textarea.setAttribute('readonly', '');
            textarea.style.position = "absolute";
            textarea.style.left = "-9999px";
            document.body.appendChild(textarea);
            textarea.select();
            document.execCommand('copy');
            document.body.removeChild(textarea);
            copyBtn.innerText = "已复制！";
            setTimeout(() => copyBtn.innerText = "复制全部回答", 1200);
        } catch (err) {
            copyBtn.innerText = "复制失败";
            setTimeout(() => copyBtn.innerText = "复制全部回答", 1200);
            alert("复制失败：" + err);
        }
    };

    msgBox.appendChild(copyBtn);
}

async function getLLMPassword() {
    return new Promise((resolve) => {
        chrome.storage.local.get(["llmPassword"], (res) => {
            resolve(res.llmPassword || "");
        });
    });
}

async function getLLMToken(forceRefresh = false) {
    const config = await loadMergedConfig();
    const tokenCfg = config.apiConfig.llmToken;
    return new Promise((resolve, reject) => {
        chrome.storage.local.get(["llmToken", "llmTokenAt"], async (res) => {
            const now = Date.now();
            if (!forceRefresh && res.llmToken && res.llmTokenAt && now - res.llmTokenAt < LLM_TOKEN_EXPIRE_MS) {
                resolve(res.llmToken);
            } else {
                try {
                    const pwd = await getLLMPassword();
                    const body = {};
                    body[tokenCfg.requestParams[0].field] = pwd;

                    const response = await fetch(tokenCfg.url, {
                        method: "POST",
                        headers: { "Content-Type": "application/json" },
                        body: JSON.stringify(body),
                    });

                    const data = await response.json();
                    const tokenField = tokenCfg.responseParams.find(p => p.label.includes("Token")).field;
                    if (data[tokenField]) {
                        chrome.storage.local.set({ llmToken: data[tokenField], llmTokenAt: now });
                        resolve(data[tokenField]);
                    } else {
                        reject("LLM token获取失败");
                    }
                } catch (e) {
                    reject("LLM token接口异常");
                }
            }
        });
    });
}

async function getLLMWorkspaceSlug(token, forceRefresh = false) {
    const config = await loadMergedConfig();
    const wsCfg = config.apiConfig.workspaces;
    const workspacesField = wsCfg.responseParams.find(p => p.field)?.field;

    return new Promise((resolve, reject) => {
        chrome.storage.local.get(["llmWorkspaceSlug", "llmWorkspaceAt"], async (res) => {
            const now = Date.now();
            if (!forceRefresh && res.llmWorkspaceSlug && res.llmWorkspaceAt && now - res.llmWorkspaceAt < LLM_TOKEN_EXPIRE_MS) {
                resolve(res.llmWorkspaceSlug);
            } else {
                try {
                    const response = await fetch(wsCfg.url, {
                        method: "GET",
                        headers: { Authorization: `Bearer ${token}` },
                    });

                    const data = await response.json();
                    const list = data[workspacesField] || [];
                    if (list.length > 0 && list[0].slug) {
                        chrome.storage.local.set({ llmWorkspaceSlug: list[0].slug, llmWorkspaceAt: now });
                        resolve(list[0].slug);
                    } else {
                        reject("未获取到LLM工作区slug");
                    }
                } catch (e) {
                    reject("LLM工作区接口异常");
                }
            }
        });
    });
}

async function fetchLLMAnswer(question, container, contentDiv) {
    if (!question || !question.trim()) return;

    const config = await loadMergedConfig();
    const llmChatCfg = config.apiConfig.llmChat;
    const llmToken = await getLLMToken();
    const workspaceSlug = await getLLMWorkspaceSlug(llmToken);
    const url = llmChatCfg.url.replace("${workId}", workspaceSlug);

    const userItem = document.createElement("div");
    userItem.className = "llm-msg-item llm-user";
    userItem.innerHTML = `<span style="color:#2a63c8;font-weight:bold;">我：</span> ${question}`;
    contentDiv.appendChild(userItem);
    container.classList.remove("hidden");

    const msgBox = document.createElement("div");
    msgBox.className = "llm-msg-item llm-assistant";
    contentDiv.appendChild(msgBox);
    contentDiv.scrollTop = contentDiv.scrollHeight;

    let collectedSources = [];
    let jumpMap = {};
    try {
        const body = {};
        body[llmChatCfg.requestParams[0].field] = question;
        body[llmChatCfg.requestParams[1].field] = [];

        const res = await fetch(url, {
            method: "POST",
            headers: {
                "Authorization": `Bearer ${llmToken}`,
                "Content-Type": "application/json"
            },
            body: JSON.stringify(body)
        });

        if (!res.ok || !res.body) {
            msgBox.innerHTML = "<span style='color:red;'>LLM接口请求失败</span>";
            return;
        }

        const reader = res.body.getReader();
        const decoder = new TextDecoder("utf-8");
        let buffer = "", done = false;
        let thinkStr = "", answerStr = "", inThink = false;

        while (!done) {
            const { value, done: readerDone } = await reader.read();
            done = readerDone;
            if (value) {
                buffer += decoder.decode(value, { stream: true });
                const lines = buffer.split("\n");
                buffer = lines.pop();
                for (let line of lines) {
                    if (line.startsWith("data: ")) {
                        const chunk = JSON.parse(line.slice(6));
                        if (chunk.sources) {
                            for (const s of chunk.sources) {
                                if (!collectedSources.find(x => x.id === s.id)) {
                                    collectedSources.push(s);
                                }
                            }
                        }

                        let content = chunk.textResponse || "";
                        if (content.includes("<think>")) {
                            inThink = true;
                            content = content.replace("<think>", "");
                        }
                        if (content.includes("</think>")) {
                            inThink = false;
                            content = content.replace("</think>", "");
                        }
                        if (inThink) {
                            thinkStr += content.replace(/\n/g, "<br>");
                        } else {
                            answerStr += content;
                        }

                        // 渲染 markdown，代码块加复制按钮
                        let html = "";
                        try {
                            html = window.marked ? wrapHtmlWithCopyBtn(marked.parse(answerStr)) : answerStr.replace(/\n/g, "<br>");
                        } catch (e) {
                            html = answerStr.replace(/\n/g, "<br>");
                        }

                        msgBox.innerHTML =
                            (thinkStr ? `<div class="llm-think">${thinkStr}</div>` : "") +
                            `<span class="assistant-label">智能助手：</span><div class="llm-md">${html}</div>`;

                        bindAllCopyButtons(msgBox);
                        insertCopyFullAnswerBtn(msgBox, answerStr);

                        contentDiv.scrollTop = contentDiv.scrollHeight;
                    }
                }
            }
        }

        if (collectedSources.length > 0) {
            const titles = collectedSources.map(s => s.title).filter(Boolean);
            jumpMap = await resolveJumpLinks(titles);

            const sourceList = document.createElement("div");
            sourceList.className = "llm-sources";
            msgBox.appendChild(sourceList);
            await renderSources(sourceList, collectedSources, jumpMap);

            insertCopyFullAnswerBtn(msgBox, answerStr);
        }
    } catch (e) {
        msgBox.innerHTML += `<span style='color:red;'>LLM异常：${e}</span>`;
    }
}