"use client";

import { Bot, User } from "lucide-react";
import { ScrollArea } from "@/components/ui/scroll-area";
import { cn } from "@/lib/utils";
import { type, typeSpacing } from "@/lib/typography";
import type { ChatMessage } from "./types";

interface ChatMessageListProps {
  messages: ChatMessage[];
  isTyping?: boolean;
  bottomRef?: React.RefObject<HTMLDivElement | null>;
}

function formatTime(date: Date): string {
  return date.toLocaleTimeString("fa-IR", {
    hour: "2-digit",
    minute: "2-digit",
  });
}

function TypingIndicator() {
  return (
    <div className="flex justify-end">
      <div className="flex max-w-[85%] items-center gap-2 rounded-2xl rounded-br-md border bg-card px-4 py-3 shadow-sm sm:max-w-[75%]">
        <div className="flex size-7 shrink-0 items-center justify-center rounded-full bg-primary/10 text-primary">
          <Bot className="size-4" aria-hidden />
        </div>
        <div className="flex items-center gap-1 py-1" aria-label="در حال نوشتن">
          <span className="size-1.5 animate-bounce rounded-full bg-muted-foreground/60 [animation-delay:0ms]" />
          <span className="size-1.5 animate-bounce rounded-full bg-muted-foreground/60 [animation-delay:150ms]" />
          <span className="size-1.5 animate-bounce rounded-full bg-muted-foreground/60 [animation-delay:300ms]" />
        </div>
      </div>
    </div>
  );
}

export function ChatMessageList({
  messages,
  isTyping = false,
  bottomRef,
}: ChatMessageListProps) {
  return (
    <ScrollArea className="min-h-0 flex-1 pe-1">
      <div className="flex flex-col gap-4 p-4 sm:p-5">
        {messages.map((message) => {
          const isUser = message.role === "user";

          return (
            <div
              key={message.id}
              className={cn("flex", isUser ? "justify-start" : "justify-end")}
            >
              <div
                className={cn(
                  "flex max-w-[92%] gap-2.5 sm:max-w-[80%]",
                  isUser ? "flex-row" : "flex-row-reverse"
                )}
              >
                <div
                  className={cn(
                    "flex size-7 shrink-0 items-center justify-center rounded-full sm:size-8",
                    isUser
                      ? "bg-primary/10 text-primary"
                      : "bg-muted text-muted-foreground"
                  )}
                >
                  {isUser ? (
                    <User className="size-4" aria-hidden />
                  ) : (
                    <Bot className="size-4" aria-hidden />
                  )}
                </div>

                <div className={cn("min-w-0", typeSpacing.chatMeta)}>
                  <div
                    className={cn(
                      "rounded-2xl px-4 py-3 shadow-sm",
                      type.chat,
                      isUser
                        ? "rounded-tr-md bg-primary text-primary-foreground"
                        : "rounded-bl-md border bg-card text-card-foreground"
                    )}
                  >
                    <p className="whitespace-pre-wrap break-words">{message.content}</p>
                  </div>
                  <p
                    className={cn(
                      type.caption,
                      isUser ? "text-start" : "text-end"
                    )}
                  >
                    {isUser ? "شما" : "دستیار"} · {formatTime(message.timestamp)}
                  </p>
                </div>
              </div>
            </div>
          );
        })}

        {isTyping && <TypingIndicator />}
        <div ref={bottomRef} className="h-px shrink-0" aria-hidden />
      </div>
    </ScrollArea>
  );
}