import json
import shutil
from datetime import date
from pathlib import Path
from typing import List, Optional

from mcdreforged.api.all import *


def _today() -> str:
	return date.today().strftime("%Y-%m-%d")


class Config(Serializable):
	# 使用 !!share / !!hat / !!head / !!c 所需的最低权限等级
	permission: int = 1
	# !!head 冷却时间（秒），0 表示不限制
	head_cooldown_seconds: int = 60
	# !!hat 冷却时间（秒），0 表示不限制
	hat_cooldown_seconds: int = 3
	# !!share 是否播放提示音
	share_sound: bool = True
	# 强制指定 MC 版本号（如 "1.12.2"），留空则自动检测
	force_version: str = ""
	# 玩家加入时是否提示可用命令
	join_tip: bool = True
	# 加入提示延迟（秒），避免和进服消息挤在一起
	join_tip_delay_seconds: float = 1.5
	# 是否发送进服 MOTD（开服天数 + 自定义行）
	motd_enabled: bool = True
	# 开服日期，格式 YYYY-MM-DD；默认为配置生成当天（当天算第 1 天）
	motd_start_day: str = _today()
	# MOTD 文本行
	motd_lines: List[str] = [
		"§6欢迎 §e{player}§6 加入服务器！",
		"§7服务器已开服 §b{days}§7 天",
		"§7官网: {link:§b点击打开官网|https://www.skymirror.top}",
		"§7QQ群: {link:§f985402607|https://skymirror.top/qq}",
	]


# MCDR data folder: config/<plugin_id>/iridium.json
CONFIG_FILE_NAME = "iridium.json"
# 旧路径（仅用于迁移）
LEGACY_CONFIG_FILE = "config/iridium.json"


def build_default_config_text() -> str:
	"""带注释的默认配置；开服日期为生成当天。"""
	today = _today()
	return f"""{{
	// 使用 !!share / !!hat / !!head / !!c 所需的最低权限等级
	// 0=控制台  1=普通玩家  2=OP/管理员
	"permission": 1,

	// !!head 冷却时间（秒），0 表示不限制
	"head_cooldown_seconds": 60,

	// !!hat 冷却时间（秒），0 表示不限制
	"hat_cooldown_seconds": 3,

	// !!share 是否播放提示音
	"share_sound": true,

	// 强制指定 Minecraft 版本（如 "1.12.2"、"1.20.1"）
	// 留空则自动检测；检测失败时可手动填写
	"force_version": "",

	// 玩家进服时是否提示可用命令
	"join_tip": true,

	// 进服消息延迟（秒），0 为立即发送
	"join_tip_delay_seconds": 1.5,

	// 是否发送进服 MOTD（开服天数 + 自定义文案）
	"motd_enabled": true,

	// 开服日期，格式 YYYY-MM-DD（当天算第 1 天）
	// 默认为本配置文件生成当天，可自行修改为真实开服日
	"motd_start_day": "{today}",

	// MOTD 文本行
	// 占位符: {{player}} 玩家名  {{days}} 开服天数  {{online}} 在线人数
	// 链接:   {{link:显示文字|https://url}}  或  {{link:https://url}}
	// 颜色:   支持原版 § 颜色代码
	"motd_lines": [
		"§6欢迎 §e{{player}}§6 加入服务器！",
		"§7服务器已开服 §b{{days}}§7 天",
		"§7官网: {{link:§b点击打开官网|https://www.skymirror.top}}",
		"§7QQ群: {{link:§f985402607|https://skymirror.top/qq}}"
	]
}}
"""


DEFAULT_CONFIG_TEXT = build_default_config_text()

# 模块级单例；on_load 时原地更新字段，避免各模块持有过期引用
config = Config()


def apply_config(new_cfg: Config) -> None:
	config.permission = new_cfg.permission
	config.head_cooldown_seconds = new_cfg.head_cooldown_seconds
	config.hat_cooldown_seconds = new_cfg.hat_cooldown_seconds
	config.share_sound = new_cfg.share_sound
	config.force_version = new_cfg.force_version
	config.join_tip = new_cfg.join_tip
	config.join_tip_delay_seconds = new_cfg.join_tip_delay_seconds
	config.motd_enabled = new_cfg.motd_enabled
	config.motd_start_day = new_cfg.motd_start_day
	config.motd_lines = list(new_cfg.motd_lines)


def _strip_json_comments(text: str) -> str:
	"""Remove // line comments outside of strings."""
	out = []
	i = 0
	n = len(text)
	in_string = False
	while i < n:
		c = text[i]
		if in_string:
			out.append(c)
			if c == "\\" and i + 1 < n:
				out.append(text[i + 1])
				i += 2
				continue
			if c == '"':
				in_string = False
			i += 1
			continue
		if c == '"':
			in_string = True
			out.append(c)
			i += 1
			continue
		if c == "/" and i + 1 < n and text[i + 1] == "/":
			while i < n and text[i] != "\n":
				i += 1
			continue
		out.append(c)
		i += 1
	return "".join(out)


def config_file_path(server: PluginServerInterface) -> Path:
	"""Canonical path: MCDR data folder → config/iridium/iridium.json"""
	return Path(server.get_data_folder()) / CONFIG_FILE_NAME


def _legacy_path(server: PluginServerInterface) -> Path:
	try:
		wd = server.get_mcdr_config().get("working_directory") or "."
		return (Path(wd) / LEGACY_CONFIG_FILE).expanduser().resolve()
	except Exception:
		return Path.cwd() / LEGACY_CONFIG_FILE


def _write_commented_default(path: Path, server: PluginServerInterface) -> bool:
	try:
		path.parent.mkdir(parents=True, exist_ok=True)
		path.write_text(build_default_config_text(), encoding="utf-8")
		server.logger.info(f"已生成配置文件: {path}")
		return True
	except Exception as e:
		server.logger.error(f"写入配置文件失败 {path}: {e}")
		return False


def _migrate_legacy(server: PluginServerInterface, dest: Path) -> None:
	"""If old config/iridium.json exists, copy it to the data folder path."""
	src = _legacy_path(server)
	try:
		if src.is_file() and src.resolve() != dest.resolve() and not dest.is_file():
			dest.parent.mkdir(parents=True, exist_ok=True)
			shutil.copy2(src, dest)
			server.logger.info(f"已从旧路径迁移配置: {src} -> {dest}")
	except Exception as e:
		server.logger.warning(f"迁移旧配置失败 {src}: {e}")


def load_config(server: PluginServerInterface) -> Config:
	"""
	Load config using MCDR's official data folder (config/iridium/iridium.json).
	1. Prefer that path; create commented default if missing
	2. Migrate legacy config/iridium.json if present
	3. Fallback: load_config_simple
	"""
	path = config_file_path(server)
	_migrate_legacy(server, path)

	if not path.is_file():
		_write_commented_default(path, server)

	if path.is_file():
		try:
			raw = path.read_text(encoding="utf-8")
			data = json.loads(_strip_json_comments(raw))
			server.logger.info(f"配置已加载: {path}")
			return Config.deserialize(data)
		except Exception as e:
			server.logger.error(f"读取/解析配置失败 {path}: {e}，尝试 load_config_simple")

	# Official MCDR loader as last resort
	try:
		cfg = server.load_config_simple(
			CONFIG_FILE_NAME,
			target_class=Config,
			in_data_folder=True,
		)
		server.logger.info(f"配置已通过 load_config_simple 加载: {path}")
		return cfg
	except Exception as e:
		server.logger.error(f"load_config_simple 失败: {e}，使用内存默认值")
		return Config()