import { defineStore } from "pinia";
import { ref } from "vue";
import type { AppSettings, AIModel } from "@/types/chat";

// 分享结果类型
export interface ShareResult {
  shareId: string;
  shareUrl: string;
  password: string;
  expiresAt: number;
}

export const useSettingsStore = defineStore("settings", () => {
  const MIN_SIDEBAR_WIDTH = 310;
  const MAX_SIDEBAR_WIDTH = 400;

  // 默认设置
  const defaultSettings: AppSettings = {
    // 外观设置
    theme: "system",
    language: "zh-CN",
    fontSize: "medium",

    // 对话设置
    sendOnEnter: true,
    showTimestamp: true,
    compactMode: false,

    // AI 默认设置
    defaultModel: "glm-4.6v",
    defaultTemperature: 0.7,
    defaultMaxTokens: 4096,
    defaultSystemPrompt: "你是一个有帮助的 AI 助手。",

    // 功能设置
    enableSound: true,
    enableNotification: true,
    autoSaveInterval: 30,

    // 隐私设置
    saveHistory: true,
    shareAnalytics: false,
  };

  // 可用的 AI 模型
  const availableModels: AIModel[] = [
    {
      id: "glm-4.6",
      name: "智普 GLM-4.6",
      description: "最强大的模型",
      maxTokens: 8192,
      provider: "Zhipu",
    },
    {
      id: "glm-4.5",
      name: "智普 GLM-4.5",
      description: "能力均衡",
      maxTokens: 8192,
      provider: "Zhipu",
    },
    {
      id: "glm-4-flash",
      name: "智普 GLM-4-Flash",
      description: "快速高效，适合日常对话",
      maxTokens: 8192,
      provider: "Zhipu",
    },
    {
      id: "glm-4v-plus",
      name: "智普 GLM-4V-Plus",
      description: "强大的视觉理解模型",
      maxTokens: 8192,
      provider: "Zhipu",
    },
    {
      id: "deepseek-chat",
      name: "DeepSeek Chat",
      description: "DeepSeek 对话模型",
      maxTokens: 8192,
      provider: "DeepSeek",
    },
    {
      id: "deepseek-reasoner",
      name: "DeepSeek Reasoner",
      description: "DeepSeek 深度思考模型",
      maxTokens: 8192,
      provider: "DeepSeek",
    },
  ];

  // 状态
  const settings = ref<AppSettings>({ ...defaultSettings });
  const sidebarCollapsed = ref(false);
  const sidebarWidth = ref(MIN_SIDEBAR_WIDTH);
  const showShortcutsModal = ref(false);
  const showSearchModal = ref(false);
  const showSettingsModal = ref(false);
  const showConversationSettingsModal = ref(false);

  // 分享相关状态
  const showShareModal = ref(false);
  const showShareResultModal = ref(false);
  const shareResult = ref<ShareResult | null>(null);

  // 主题相关
  function applyTheme(theme: AppSettings["theme"]) {
    const root = document.documentElement;

    if (theme === "system") {
      const prefersDark = window.matchMedia(
        "(prefers-color-scheme: dark)",
      ).matches;
      root.classList.toggle("dark", prefersDark);
    } else {
      root.classList.toggle("dark", theme === "dark");
    }
  }

  function toggleTheme() {
    const themes: AppSettings["theme"][] = ["light", "dark", "system"];
    const currentIndex = themes.indexOf(settings.value.theme);
    settings.value.theme = themes[(currentIndex + 1) % themes.length];
    applyTheme(settings.value.theme);
    saveToStorage();
  }

  function setTheme(theme: AppSettings["theme"]) {
    settings.value.theme = theme;
    applyTheme(theme);
    saveToStorage();
  }

  // 字体大小
  function applyFontSize(size: AppSettings["fontSize"]) {
    const root = document.documentElement;
    const sizeMap = {
      small: "14px",
      medium: "16px",
      large: "18px",
    };
    root.style.setProperty("--base-font-size", sizeMap[size]);
  }

  function setFontSize(size: AppSettings["fontSize"]) {
    settings.value.fontSize = size;
    applyFontSize(size);
    saveToStorage();
  }

  // 侧边栏
  function toggleSidebar() {
    sidebarCollapsed.value = !sidebarCollapsed.value;
    saveToStorage();
  }

  function setSidebarWidth(width: number) {
    sidebarWidth.value = Math.max(MIN_SIDEBAR_WIDTH, Math.min(MAX_SIDEBAR_WIDTH, width));
    saveToStorage();
  }

  // 模态框
  function openShortcutsModal() {
    showShortcutsModal.value = true;
  }

  function closeShortcutsModal() {
    showShortcutsModal.value = false;
  }

  function openSearchModal() {
    showSearchModal.value = true;
  }

  function closeSearchModal() {
    showSearchModal.value = false;
  }

  function openSettingsModal() {
    showSettingsModal.value = true;
  }

  function closeSettingsModal() {
    showSettingsModal.value = false;
  }

  function openConversationSettingsModal() {
    showConversationSettingsModal.value = true;
  }

  function closeConversationSettingsModal() {
    showConversationSettingsModal.value = false;
  }

  // 分享模态框
  function openShareModal() {
    showShareModal.value = true;
  }

  function closeShareModal() {
    showShareModal.value = false;
  }

  function openShareResultModal() {
    showShareResultModal.value = true;
  }

  function closeShareResultModal() {
    showShareResultModal.value = false;
  }

  function setShareResult(result: ShareResult) {
    shareResult.value = result;
  }

  function clearShareResult() {
    shareResult.value = null;
  }

  // 更新设置
  function updateSettings(updates: Partial<AppSettings>) {
    Object.assign(settings.value, updates);

    if (updates.theme) {
      applyTheme(updates.theme);
    }

    if (updates.fontSize) {
      applyFontSize(updates.fontSize);
    }

    saveToStorage();
  }

  // 重置设置
  function resetSettings() {
    settings.value = { ...defaultSettings };
    applyTheme(settings.value.theme);
    applyFontSize(settings.value.fontSize);
    saveToStorage();
  }

  // 导出设置
  function exportSettings(): string {
    return JSON.stringify(settings.value, null, 2);
  }

  // 导入设置
  function importSettings(json: string): boolean {
    try {
      const imported = JSON.parse(json);
      settings.value = { ...defaultSettings, ...imported };
      applyTheme(settings.value.theme);
      applyFontSize(settings.value.fontSize);
      saveToStorage();
      return true;
    } catch {
      return false;
    }
  }

  // 存储
  function saveToStorage() {
    try {
      localStorage.setItem("chat-settings", JSON.stringify(settings.value));
      localStorage.setItem(
        "chat-sidebar-collapsed",
        JSON.stringify(sidebarCollapsed.value),
      );
      localStorage.setItem(
        "chat-sidebar-width",
        JSON.stringify(sidebarWidth.value),
      );
    } catch (e) {
      console.error("Failed to save settings:", e);
    }
  }

  // 存储选中模型 ID 的 localStorage key
  const MODEL_ID_KEY = "modelSelectId";

  // 获取当前选择的模型 ID
  function getSelectedModelId(): string {
    return defaultSettings.defaultModel;
  }

  // 设置当前选择的模型 ID
  function setSelectedModelId(modelId: string) {
    localStorage.setItem(MODEL_ID_KEY, modelId);
    // 同时更新 settings 中的 defaultModel
    settings.value.defaultModel = modelId;
    saveToStorage();
  }

  function loadFromStorage() {
    try {
      const stored = localStorage.getItem("chat-settings");
      if (stored) {
        settings.value = { ...defaultSettings, ...JSON.parse(stored) };
      }

      const collapsedStored = localStorage.getItem("chat-sidebar-collapsed");
      if (collapsedStored) {
        sidebarCollapsed.value = JSON.parse(collapsedStored);
      }

      const widthStored = localStorage.getItem("chat-sidebar-width");
      if (widthStored) {
        setSidebarWidth(JSON.parse(widthStored));
      }

      // 应用主题和字体
      applyTheme(settings.value.theme);
      applyFontSize(settings.value.fontSize);
    } catch (e) {
      console.error("Failed to load settings:", e);
    }
  }

  // 监听系统主题变化
  if (typeof window !== "undefined") {
    const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
    mediaQuery.addEventListener("change", () => {
      if (settings.value.theme === "system") {
        applyTheme("system");
      }
    });
  }

  // 初始化
  loadFromStorage();

  return {
    // 状态
    settings,
    sidebarCollapsed,
    sidebarWidth,
    showShortcutsModal,
    showSearchModal,
    showSettingsModal,
    showConversationSettingsModal,
    availableModels,
    // 分享相关状态
    showShareModal,
    showShareResultModal,
    shareResult,

    // 方法
    toggleTheme,
    setTheme,
    setFontSize,
    toggleSidebar,
    setSidebarWidth,
    openShortcutsModal,
    closeShortcutsModal,
    openSearchModal,
    closeSearchModal,
    openSettingsModal,
    closeSettingsModal,
    openConversationSettingsModal,
    closeConversationSettingsModal,
    // 分享模态框方法
    openShareModal,
    closeShareModal,
    openShareResultModal,
    closeShareResultModal,
    setShareResult,
    clearShareResult,
    updateSettings,
    resetSettings,
    exportSettings,
    importSettings,
    loadFromStorage,
    getSelectedModelId,
    setSelectedModelId,
  };
});