from __future__ import annotations

import time


from .framework import CommandRegistry, CommandContext, CommandResult

_start_time = time.time()


async def _cmd_ping(ctx: CommandContext) -> CommandResult:
    uptime = time.time() - _start_time
    hours = int(uptime // 3600)
    minutes = int((uptime % 3600) // 60)
    seconds = int(uptime % 60)

    msg = ctx.msg
    user = msg.identity.channel_user_id or "Unknown"
    return CommandResult(
        success=True,
        message=f"Pong! 在线时间: {hours}h {minutes}m {seconds}s\n发送者: {user}",
    )


async def _cmd_help(ctx: CommandContext) -> CommandResult:
    registry = ctx.adapter._command_registry if hasattr(ctx.adapter, "_command_registry") else None
    if registry is None:
        return CommandResult(success=True, message="命令系统未初始化。")

    lines = ["可用命令："]
    seen: set[str] = set()
    for name in sorted(registry.command_names):
        cmd = registry._commands.get(name)
        if cmd and name not in seen:
            seen.add(name)
            desc = cmd.description or "(无描述)"
            usage = f" - 用法: {cmd.usage}" if cmd.usage else ""
            lines.append(f"  /{name} - {desc}{usage}")

    return CommandResult(success=True, message="\n".join(lines))


async def _cmd_status(ctx: CommandContext) -> CommandResult:
    adapter = ctx.adapter
    status = getattr(adapter, "status", "unknown")
    reconnect = getattr(adapter, "_reconnect_manager", None)
    reconnect_state = reconnect.state.name if reconnect else "N/A"
    circuit_breaker = getattr(adapter, "_circuit_breaker", None)
    cb_state = "open" if circuit_breaker and circuit_breaker.is_open else "closed"

    return CommandResult(
        success=True,
        message=(f"状态: {status}\n重连状态: {reconnect_state}\n熔断器: {cb_state}"),
    )


async def _cmd_clearlogs(ctx: CommandContext) -> CommandResult:
    adapter = ctx.adapter
    known_users = getattr(adapter, "_known_users", None)
    group_buffer = getattr(adapter, "_group_buffer", None)

    if known_users:
        known_users.clear()
    if group_buffer:
        group_buffer.gc()

    return CommandResult(success=True, message="日志已清理（已知用户记录 + 过期群聊缓冲）。")


def register_builtin_commands(registry: CommandRegistry) -> CommandRegistry:
    registry.register(
        name="ping",
        handler=_cmd_ping,
        description="检测 Bot 是否在线",
        usage="/ping",
        aliases=["p"],
    )

    registry.register(
        name="help",
        handler=_cmd_help,
        description="显示所有可用命令",
        usage="/help",
        aliases=["h"],
    )

    registry.register(
        name="status",
        handler=_cmd_status,
        description="查看 Bot 运行状态",
        usage="/status",
        aliases=["st"],
    )

    registry.register(
        name="clearlogs",
        handler=_cmd_clearlogs,
        description="清理运行日志和缓存",
        usage="/clearlogs",
    )

    return registry