import { readFileSync, existsSync, statSync } from "fs";

export const LOG_FILE = "/home/minecraft/server/logs/latest.log";

export type ChatMessage = {
  time: string;
  type: "chat" | "join" | "leave" | "death" | "server";
  player: string;
  message: string;
};

export function parseLogLine(line: string): ChatMessage | null {
  const chatMatch = line.match(
    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:DedicatedServer|MinecraftServer)\]:\s*<(\w+)>\s*(.*)/
  );
  if (chatMatch) {
    return { time: chatMatch[1], type: "chat", player: chatMatch[2], message: chatMatch[3] };
  }

  const joinMatch = line.match(
    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:PlayerList|ServerPlayer)\]:\s*(\w+)\s+joined the game/
  );
  if (joinMatch) {
    return { time: joinMatch[1], type: "join", player: joinMatch[2], message: "joined the game" };
  }

  const leaveMatch = line.match(
    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:PlayerList|ServerPlayer)\]:\s*(\w+)\s+left the game/
  );
  if (leaveMatch) {
    return { time: leaveMatch[1], type: "leave", player: leaveMatch[2], message: "left the game" };
  }

  const deathMatch = line.match(
    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:DedicatedServer|MinecraftServer)\]:\s*(\w+)\s+(was |died|drowned|burned|fell|starved|suffocated|hit|blew|withered|tried|experienced|went|walked|froze|was prick|was stung|was impaled|was squashed|was skewered|was squished|was pummeled|discovered)(.*)/
  );
  if (deathMatch) {
    return {
      time: deathMatch[1],
      type: "death",
      player: deathMatch[2],
      message: deathMatch[3] + (deathMatch[4] || ""),
    };
  }

  const sayMatch = line.match(
    /\[(\d{2}:\d{2}:\d{2})\].*\[minecraft\/(?:DedicatedServer|MinecraftServer)\]:\s*\[Server\]\s*(.*)/
  );
  if (sayMatch) {
    return { time: sayMatch[1], type: "server", player: "Server", message: sayMatch[2] };
  }

  return null;
}

export function readChatMessages(maxLines = 50): ChatMessage[] {
  if (!existsSync(LOG_FILE)) return [];
  const content = readFileSync(LOG_FILE, "utf8");
  const lines = content.split("\n");
  const messages: ChatMessage[] = [];
  for (let i = lines.length - 1; i >= 0 && messages.length < maxLines; i--) {
    const msg = parseLogLine(lines[i]);
    if (msg) messages.unshift(msg);
  }
  return messages;
}

export function logMtime(): number {
  try {
    return statSync(LOG_FILE).mtimeMs;
  } catch {
    return 0;
  }
}