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import React from "react";
import { format } from "date-fns";
import { Bot, TrashIcon, User, FileText, Settings, PanelLeft, Plus } from "lucide-react";
import { Button } from "@/components/ui/button";
import { cn } from "@/lib/utils";
import { Chat } from "@/types/chat";
import { ModeToggle } from "@/components/layout/ModeToggle";

interface ChatSidebarProps {
  chats: Chat[];
  activeChat: Chat | null;
  isGeneratingTitle: boolean;
  createNewChat: () => void;
  selectChat: (id: string) => void;
  onRequestDelete: (id: string) => void;
  onOpenSettings: () => void;
  onOpenSources: () => void;
  openProfileModal: () => void;
  isSidebarOpen: boolean;
  setIsSidebarOpen: (open: boolean) => void;
}

export const ChatSidebar: React.FC<ChatSidebarProps> = ({
  chats,
  activeChat,
  isGeneratingTitle,
  createNewChat,
  selectChat,
  onRequestDelete,
  onOpenSettings,
  onOpenSources,
  openProfileModal,
  isSidebarOpen,
  setIsSidebarOpen,
}) => {
  return (
    <div className={cn(
      "fixed top-0 bottom-0 left-0 z-20 bg-background/90 backdrop-blur-lg",
      "transition-transform duration-300 ease-in-out",
      isSidebarOpen ? 'translate-x-0' : '-translate-x-full md:translate-x-0',
      "w-72 lg:w-80 border-r border-border/50 flex-shrink-0",
      "md:relative md:inset-auto h-full md:z-0"
    )}>
      <div className="flex flex-col h-full">
        <div className="p-4 pb-0">
          <div className="flex justify-between items-center">
            <div className="flex items-center space-x-2">
              <div className="h-8 w-8 bg-primary/90 rounded-md flex items-center justify-center">
                <span className="text-white font-bold text-lg">AI</span>
              </div>
              <h1 className="text-xl font-semibold">
                Insight AI
              </h1>
            </div>
            <Button className="md:hidden" variant="ghost" size="icon" onClick={() => setIsSidebarOpen(false)}>
              <PanelLeft className="h-5 w-5" />
            </Button>
          </div>
          
          <div className="py-4">
            <Button 
              onClick={createNewChat} 
              className="w-full justify-start gap-2" 
              variant="outline"
            >
              <Plus className="h-4 w-4" />
              New Chat
            </Button>
          </div>
          
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-2">
              <Bot className="h-5 w-5 text-primary" />
              <span className="font-medium">Recent Chats</span>
            </div>
          </div>
        </div>

        <div className="flex-1 overflow-y-auto p-2 space-y-1 scrollbar-thin">
          {chats.length === 0 ? (
            <div className="text-center text-muted-foreground p-4">
              No conversations yet. Start a new one!
            </div>
          ) : (
            chats.map(chat => (
              <div
                key={chat.id}
                onClick={() => selectChat(chat.id)}
                className={cn(
                  "flex items-center justify-between p-2 px-3 rounded-lg cursor-pointer group transition-all",
                  activeChat?.id === chat.id
                    ? "bg-primary/10 border border-primary/20"
                    : "hover:bg-muted/50 border border-transparent"
                )}
              >
                <div className="flex-1 truncate">
                  <div className={cn(
                    "font-medium truncate flex items-center",
                    activeChat?.id === chat.id && "text-primary"
                  )}>
                    <Bot className="h-3.5 w-3.5 mr-1.5 opacity-70" />
                    {chat.title}
                    {chat.id === activeChat?.id && isGeneratingTitle && (
                      <span className="ml-1.5 inline-block h-2 w-2 rounded-full bg-primary/70 animate-pulse"></span>
                    )}
                  </div>
                  <div className="text-xs text-muted-foreground">
                    {chat.messages.filter(m => m.sender === "user").length} messages • {format(new Date(chat.updatedAt), "MMM d")}
                  </div>
                </div>
                <Button
                  variant="ghost"
                  size="icon"
                  className="h-7 w-7 opacity-0 group-hover:opacity-100 transition-opacity hover:bg-destructive/10 hover:text-destructive"
                  onClick={(e) => {
                    e.stopPropagation();
                    onRequestDelete(chat.id);
                  }}
                >
                  <TrashIcon className="h-3.5 w-3.5" />
                </Button>
              </div>
            ))
          )}
        </div>

        {/* Sidebar Footer */}
        <div className="p-3 space-y-2">
          <Button 
            onClick={openProfileModal} 
            variant="ghost" 
            className="w-full justify-start gap-2 text-muted-foreground hover:text-foreground"
            size="sm"
          >
            <User className="h-4 w-4" />
            Profile
          </Button>
          
          <Button 
            onClick={onOpenSources} 
            variant="ghost" 
            className="w-full justify-start gap-2 text-muted-foreground hover:text-foreground"
            size="sm"
          >
            <FileText className="h-4 w-4" />
            View Sources
          </Button>
          
          <Button 
            onClick={onOpenSettings} 
            variant="ghost" 
            className="w-full justify-start gap-2 text-muted-foreground hover:text-foreground"
            size="sm"
          >
            <Settings className="h-4 w-4" />
            Settings
          </Button>
          
          <div className="flex items-center justify-between pt-2 border-t">
            <span className="text-xs text-muted-foreground">Theme</span>
            <ModeToggle />
          </div>
        </div>
      </div>
    </div>
  );
};