"""提醒工具 —— 创建 / 查看 / 删除提醒。

LLM 直接传入结构化参数，不再需要二级路由或二次 AI 解析。
"""

import json
from datetime import datetime

from tools import Tool, tool_registry


# ── 创建提醒 ────────────────────────────────────────────────

def _handle_reminder_create(ctx, type: str = "once", time: str = "",
                            content: str = "", weekday: int = None, **_) -> str:
    if not hasattr(ctx.robot, "reminder_manager"):
        return json.dumps({"error": "提醒管理器未初始化"}, ensure_ascii=False)

    if not time or not content:
        return json.dumps({"error": "缺少必要字段: time 和 content"}, ensure_ascii=False)

    if len(content.strip()) < 2:
        return json.dumps({"error": "提醒内容太短"}, ensure_ascii=False)

    # 校验时间格式
    if type == "once":
        parsed_dt = None
        for fmt in ("%Y-%m-%d %H:%M", "%Y-%m-%d %H:%M:%S"):
            try:
                parsed_dt = datetime.strptime(time, fmt)
                break
            except ValueError:
                continue
        if not parsed_dt:
            return json.dumps({"error": f"once 类型时间格式应为 YYYY-MM-DD HH:MM，收到: {time}"}, ensure_ascii=False)
        if parsed_dt < datetime.now():
            return json.dumps({"error": f"时间 {time} 已过去，请使用未来的时间"}, ensure_ascii=False)
        time = parsed_dt.strftime("%Y-%m-%d %H:%M")

    elif type in ("daily", "weekly"):
        parsed_time = None
        for fmt in ("%H:%M", "%H:%M:%S"):
            try:
                parsed_time = datetime.strptime(time, fmt)
                break
            except ValueError:
                continue
        if not parsed_time:
            return json.dumps({"error": f"daily/weekly 类型时间格式应为 HH:MM，收到: {time}"}, ensure_ascii=False)
        time = parsed_time.strftime("%H:%M")
    else:
        return json.dumps({"error": f"不支持的提醒类型: {type}"}, ensure_ascii=False)

    if type == "weekly":
        if weekday is None or not (isinstance(weekday, int) and 0 <= weekday <= 6):
            return json.dumps({"error": "weekly 类型需要 weekday 参数 (0=周一 … 6=周日)"}, ensure_ascii=False)

    data = {"type": type, "time": time, "content": content, "extra": {}}
    if weekday is not None:
        data["weekday"] = weekday

    roomid = ctx.msg.roomid if ctx.is_group else None
    success, result = ctx.robot.reminder_manager.add_reminder(ctx.msg.sender, data, roomid=roomid)

    if success:
        type_label = {"once": "一次性", "daily": "每日", "weekly": "每周"}.get(type, type)
        return json.dumps({"success": True, "id": result,
                           "message": f"已创建{type_label}提醒: {time} - {content}"}, ensure_ascii=False)
    return json.dumps({"success": False, "error": result}, ensure_ascii=False)


# ── 查看提醒 ────────────────────────────────────────────────

def _handle_reminder_list(ctx, **_) -> str:
    if not hasattr(ctx.robot, "reminder_manager"):
        return json.dumps({"error": "提醒管理器未初始化"}, ensure_ascii=False)

    reminders = ctx.robot.reminder_manager.list_reminders(ctx.msg.sender)
    if not reminders:
        return json.dumps({"reminders": [], "message": "当前没有任何提醒"}, ensure_ascii=False)
    return json.dumps({"reminders": reminders, "count": len(reminders)}, ensure_ascii=False)


# ── 删除提醒 ────────────────────────────────────────────────

def _handle_reminder_delete(ctx, reminder_id: str = "", delete_all: bool = False, **_) -> str:
    if not hasattr(ctx.robot, "reminder_manager"):
        return json.dumps({"error": "提醒管理器未初始化"}, ensure_ascii=False)

    if delete_all:
        success, message, count = ctx.robot.reminder_manager.delete_all_reminders(ctx.msg.sender)
        return json.dumps({"success": success, "message": message, "deleted_count": count}, ensure_ascii=False)

    if not reminder_id:
        return json.dumps({"error": "请提供 reminder_id，或设置 delete_all=true 删除全部"}, ensure_ascii=False)

    success, message = ctx.robot.reminder_manager.delete_reminder(ctx.msg.sender, reminder_id)
    return json.dumps({"success": success, "message": message}, ensure_ascii=False)


# ── 注册 ────────────────────────────────────────────────────

tool_registry.register(Tool(
    name="reminder_create",
    description=(
        "创建提醒。支持 once(一次性)、daily(每日)、weekly(每周) 三种类型。"
        "当前时间已在对话上下文中提供，请据此计算目标时间。"
    ),
    status_text="正在设置提醒...",
    parameters={
        "type": "object",
        "properties": {
            "type": {
                "type": "string",
                "enum": ["once", "daily", "weekly"],
                "description": "提醒类型",
            },
            "time": {
                "type": "string",
                "description": "once → YYYY-MM-DD HH:MM；daily/weekly → HH:MM",
            },
            "content": {
                "type": "string",
                "description": "提醒内容",
            },
            "weekday": {
                "type": "integer",
                "description": "仅 weekly 需要。0=周一 … 6=周日",
            },
        },
        "required": ["type", "time", "content"],
        "additionalProperties": False,
    },
    handler=_handle_reminder_create,
))

tool_registry.register(Tool(
    name="reminder_list",
    description="查看当前用户的所有提醒列表。",
    parameters={"type": "object", "properties": {}, "additionalProperties": False},
    handler=_handle_reminder_list,
))

tool_registry.register(Tool(
    name="reminder_delete",
    description=(
        "删除提醒。需要先调用 reminder_list 获取 ID，再用 reminder_id 精确删除；"
        "或设置 delete_all=true 一次性删除全部。"
    ),
    parameters={
        "type": "object",
        "properties": {
            "reminder_id": {
                "type": "string",
                "description": "要删除的提醒完整 ID",
            },
            "delete_all": {
                "type": "boolean",
                "description": "是否删除该用户全部提醒",
            },
        },
        "additionalProperties": False,
    },
    handler=_handle_reminder_delete,
))