import { allow, deny } from "@/lib/decision"
import { useAuthStore } from "@/store/auth"
import { useChatStore } from "@/store/chat"

export function listChatSessions() {
  return useChatStore.getState().sessions
}

export function getChatSessionById(sessionId: string) {
  return useChatStore.getState().sessions.find((session) => session.id === sessionId)
}

export function listChatMessages(sessionId: string) {
  return useChatStore.getState().messages.filter((message) => message.sessionId === sessionId)
}

export function sendTextMessage(sessionId: string, content: string) {
  const userId = useAuthStore.getState().user?.id
  if (!userId) return deny(401, "请先登录")

  const chatState = useChatStore.getState()
  const session = chatState.sessions.find((item) => item.id === sessionId)
  if (!session) return deny(404, "会话不存在")
  if (session.readonly) return deny(400, "当前会话只读")
  if (!session.participants.some((participant) => participant.id === userId)) {
    return deny(403, "仅会话参与方可发送消息")
  }

  if (!content.trim()) {
    return deny(400, "消息不能为空")
  }

  chatState.sendTextMessage(sessionId, userId, content)
  return allow()
}

export function sendImageMessage(sessionId: string, imageUrl: string) {
  const userId = useAuthStore.getState().user?.id
  if (!userId) return deny(401, "请先登录")

  const chatState = useChatStore.getState()
  const session = chatState.sessions.find((item) => item.id === sessionId)
  if (!session) return deny(404, "会话不存在")
  if (session.readonly) return deny(400, "当前会话只读")
  if (!session.participants.some((participant) => participant.id === userId)) {
    return deny(403, "仅会话参与方可发送消息")
  }

  if (!imageUrl.trim()) {
    return deny(400, "图片地址无效")
  }

  chatState.sendImageMessage(sessionId, userId, imageUrl)
  return allow()
}