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"use client";

import { useEffect, useState, useCallback } from "react";
import { Plus, Search, MessageSquare, Bot } from "lucide-react"; // Removed Library, Sparkles, Archive
import {
  Sidebar,
  SidebarContent,
  SidebarGroup,
  SidebarGroupContent,
  SidebarGroupLabel,
  SidebarMenu,
  SidebarHeader,
  SidebarMenuItem,
  SidebarMenuButton,
  useSidebar,
} from "./ui/sidebar";
import { getAllChats, createChat } from "@/lib/storage";
import type { Chat } from "@/lib/types";
import ChatButton from "@/components/sidebar/chatButton";
import { chatEventEmitter, CHAT_RENAMED_EVENT } from "@/lib/chatEventEmitter";
import { useChatStore } from "@/stores/chatStore";
import { cn } from "@/lib/utils";
import SearchModal from "./search-modal";

const AppSidebar = () => {
  const [chats, setChats] = useState<Chat[]>([]);
  const [isSearchModalOpen, setIsSearchModalOpen] = useState(false);
  const { loadChat, selectedChatId, updateChatName, deleteChat } =
    useChatStore();
  const { state } = useSidebar();

  const isCollapsed = state === "collapsed";

  const loadChats = useCallback(async () => {
    try {
      const loadedChats = await getAllChats();
      setChats(loadedChats.reverse());
    } catch (error) {
      console.error("Failed to load chats:", error);
    }
  }, []);

  const handleChatDelete = async (chatId: string) => {
    try {
      const deleted = await deleteChat(chatId);
      if (!deleted) return false;
      setChats((prevChats) => prevChats.filter((chat) => chat.id !== chatId));
      return true;
    } catch (error) {
      console.error("Failed to delete chat:", error);
      return false;
    }
  };

  const handleChatRename = async (chatId: string, newTitle: string) => {
    try {
      await updateChatName(chatId, newTitle);
      setChats((prevChats) =>
        prevChats.map((chat) =>
          chat.id === chatId ? { ...chat, title: newTitle } : chat
        )
      );
      return true;
    } catch (error) {
      console.error("Failed to rename chat:", error);
      return false;
    }
  };

  useEffect(() => {
    loadChats();
    chatEventEmitter.on(CHAT_RENAMED_EVENT, loadChats);
    return () => {
      chatEventEmitter.off(CHAT_RENAMED_EVENT, loadChats);
    };
  }, [loadChats]);

  const handleNewChat = async () => {
    try {
      const chatName = "New Chat";
      const newChat = await createChat(chatName, []);
      loadChat(newChat.id);
      setChats((prevChats) => [newChat, ...prevChats]);
    } catch (error) {
      console.error("Failed to create new chat:", error);
    }
  };

  const menuItems = [
    { icon: Plus, label: "New chat", action: handleNewChat },
    {
      icon: Search,
      label: "Search chats",
      action: () => setIsSearchModalOpen(true),
    },
  ];

  return (
    <>
      <Sidebar
        className="border-r border-border/50 bg-gradient-to-b from-card/50 to-background"
        collapsible="icon"
      >
        <SidebarHeader
          className={cn(
            "border-b border-border/50 bg-background/95 backdrop-blur",
            isCollapsed && "px-2"
          )}
        >
          {!isCollapsed && (
            <div className="p-4 flex items-center justify-between">
              <div className="flex items-center gap-2 min-w-0">
                <h1 className="font-semibold text-lg bg-gradient-to-r from-foreground to-foreground/70 bg-clip-text text-transparent truncate">
                  Transcriptinator 6000
                </h1>
              </div>
            </div>
          )}
        </SidebarHeader>

        <SidebarContent className="flex-1 overflow-x-clip custom-scrollbar">
          <SidebarGroup>
            {/* Menu Items */}
            <SidebarMenu
              className={cn("px-2 py-2", isCollapsed && "space-y-1")}
            >
              {menuItems.map((item, index) => (
                <SidebarMenuItem key={index}>
                  <SidebarMenuButton
                    onClick={item.action}
                    tooltip={isCollapsed ? item.label : undefined}
                    className={cn(
                      "transition-all duration-200 hover:bg-accent/50 rounded-lg h-10",
                      isCollapsed ? "justify-center w-10" : "justify-start",
                      item.label === "New chat" &&
                        "bg-primary/10 hover:bg-primary/20 text-primary border border-primary/20"
                    )}
                  >
                    <item.icon className="h-4 w-4" />
                    {!isCollapsed && (
                      <span className="text-sm font-medium">{item.label}</span>
                    )}
                  </SidebarMenuButton>
                </SidebarMenuItem>
              ))}
            </SidebarMenu>

            {!isCollapsed && (
              <SidebarGroupLabel className="px-4 text-xs font-medium text-muted-foreground/80 mt-4 mb-2">
                Recent Chats
              </SidebarGroupLabel>
            )}

            <SidebarGroupContent>
              <SidebarMenu className="px-2">
                {!isCollapsed ? (
                  chats.length > 0 ? (
                    chats.map((chat) => (
                      <ChatButton
                        key={chat.id}
                        chat={chat}
                        isSelected={selectedChatId === chat.id}
                        onClick={loadChat}
                        onDelete={handleChatDelete}
                        onRename={handleChatRename}
                      />
                    ))
                  ) : (
                    <div className="px-4 py-8 text-center">
                      <MessageSquare className="h-8 w-8 text-muted-foreground/50 mx-auto mb-3" />
                      <p className="text-sm text-muted-foreground">
                        No conversations yet
                      </p>
                      <p className="text-xs text-muted-foreground/60 mt-1">
                        Create your first chat to get started
                      </p>
                    </div>
                  )
                ) : (
                  // Collapsed state - show recent chats as icons
                  chats.slice(0, 8).map((chat) => (
                    <SidebarMenuItem key={chat.id}>
                      <SidebarMenuButton
                        onClick={() => loadChat(chat.id)}
                        tooltip={chat.title}
                        className={cn(
                          "justify-center w-10 h-10 rounded-lg transition-all duration-200", // Explicitly set w-10 h-10
                          selectedChatId === chat.id
                            ? "bg-primary/20 border border-primary/30 text-primary"
                            : "hover:bg-accent/50"
                        )}
                      >
                        <Bot
                          className={cn(
                            "h-4 w-4",
                            selectedChatId === chat.id
                              ? "text-primary"
                              : "text-muted-foreground"
                          )}
                        />
                      </SidebarMenuButton>
                    </SidebarMenuItem>
                  ))
                )}
              </SidebarMenu>
            </SidebarGroupContent>
          </SidebarGroup>
        </SidebarContent>
      </Sidebar>

      <SearchModal
        open={isSearchModalOpen}
        onOpenChange={setIsSearchModalOpen}
      />
    </>
  );
};

export default AppSidebar;