"use client"

import { ArrowLeft, Lock, Send } from "lucide-react"
import Link from "next/link"
import { use, useState } from "react"
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar"
import { Badge } from "@/components/ui/badge"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { ScrollArea } from "@/components/ui/scroll-area"
import { mockChatMessages, mockChatSessions } from "@/lib/mock-data"
import { cn } from "@/lib/utils"

export default function ChatDetailPage({ params }: { params: Promise<{ id: string }> }) {
  const { id } = use(params)
  const session = mockChatSessions.find((s) => s.id === id)
  const messages = mockChatMessages.filter((m) => m.sessionId === id)
  const [input, setInput] = useState("")

  if (!session) {
    return (
      <div className="container mx-auto py-8 px-4 text-center text-muted-foreground">
        会话不存在
      </div>
    )
  }

  const other = session.participants[1]
  const currentUserId = session.participants[0].id

  return (
    <div className="flex flex-col h-[calc(100vh-3.5rem)]">
      <div className="border-b px-4 py-3 flex items-center gap-3">
        <Link href="/chat" className="text-muted-foreground hover:text-foreground">
          <ArrowLeft className="h-5 w-5" />
        </Link>
        <Avatar className="h-8 w-8">
          <AvatarImage src={other.avatar} />
          <AvatarFallback>{other.name[0]}</AvatarFallback>
        </Avatar>
        <div>
          <span className="text-sm font-medium">{other.name}</span>
          <div className="flex items-center gap-1">
            <Badge variant="outline" className="text-[10px] px-1.5 py-0">
              {session.type === "order" ? "订单会话" : "咨询会话"}
            </Badge>
            {session.readonly && (
              <span className="text-[10px] text-muted-foreground flex items-center gap-0.5">
                <Lock className="h-3 w-3" />
                只读
              </span>
            )}
          </div>
        </div>
      </div>

      <ScrollArea className="flex-1 p-4">
        <div className="space-y-4 max-w-2xl mx-auto">
          {messages.map((msg) => {
            if (msg.type === "system") {
              return (
                <div key={msg.id} className="text-center">
                  <span className="text-xs text-muted-foreground bg-muted px-2 py-1 rounded">
                    {msg.content}
                  </span>
                </div>
              )
            }
            const isMine = msg.senderId === currentUserId
            return (
              <div key={msg.id} className={cn("flex gap-2", isMine && "flex-row-reverse")}>
                <Avatar className="h-8 w-8 shrink-0">
                  <AvatarImage src={msg.senderAvatar} />
                  <AvatarFallback>{msg.senderName[0]}</AvatarFallback>
                </Avatar>
                <div className={cn("max-w-[70%]", isMine && "text-right")}>
                  <p
                    className={cn(
                      "inline-block rounded-lg px-3 py-2 text-sm",
                      isMine ? "bg-primary text-primary-foreground" : "bg-muted",
                    )}
                  >
                    {msg.content}
                  </p>
                  <p className="text-[10px] text-muted-foreground mt-1">
                    {new Date(msg.createdAt).toLocaleTimeString("zh-CN", {
                      hour: "2-digit",
                      minute: "2-digit",
                    })}
                  </p>
                </div>
              </div>
            )
          })}
        </div>
      </ScrollArea>

      {!session.readonly ? (
        <div className="border-t p-4">
          <form
            className="flex gap-2 max-w-2xl mx-auto"
            onSubmit={(e) => {
              e.preventDefault()
              setInput("")
            }}
          >
            <Input
              value={input}
              onChange={(e) => setInput(e.target.value)}
              placeholder="输入消息..."
              className="flex-1"
            />
            <Button type="submit" size="icon" disabled={!input.trim()}>
              <Send className="h-4 w-4" />
            </Button>
          </form>
        </div>
      ) : (
        <div className="border-t p-4 text-center text-sm text-muted-foreground">
          <Lock className="h-4 w-4 inline mr-1" />
          订单已关闭，会话为只读状态
        </div>
      )}
    </div>
  )
}