"""
微信登录 + 绑定手机号邮箱 Use Case
"""

from __future__ import annotations

import logging
from datetime import datetime, timezone
from typing import Optional

from packages.application.auth.verification_code_service import (
    CODE_TYPE_EMAIL_BIND,
    CODE_TYPE_PHONE_BIND,
    normalize_phone,
    validate_email,
    validate_phone,
)
from packages.domain.entities import User

logger = logging.getLogger(__name__)


class BindContactRequest:
    """绑定联系方式请求"""

    def __init__(
        self,
        user_id: str,
        phone: str = "",
        phone_code: str = "",
        email: str = "",
        email_code: str = "",
    ):
        self.user_id = user_id
        self.phone = normalize_phone(phone) if phone else ""
        self.phone_code = phone_code.strip() if phone_code else ""
        self.email = email.strip().lower() if email else ""
        self.email_code = email_code.strip() if email_code else ""


class BindContactResponse:
    """绑定响应"""

    def __init__(self, user: User):
        self.user = user

    def to_dict(self) -> dict:
        return {
            "user": {
                "id": self.user.id,
                "email": self.user.email,
                "phone": self.user.phone,
                "phone_verified": self.user.phone_verified,
                "display_name": self.user.display_name,
                "binding_complete": self.user.binding_completed_at is not None,
            }
        }


class BindContactUseCase:
    """绑定手机+邮箱用例"""

    def __init__(
        self,
        user_repository,
        verification_code_service,
        email_service=None,
    ):
        self.user_repo = user_repository
        self.verification_service = verification_code_service
        self.email_service = email_service

    def execute(self, request: BindContactRequest) -> tuple[Optional[BindContactResponse], Optional[str]]:
        try:
            # 1. 校验参数
            if not request.phone and not request.email:
                return None, "至少填写手机号或邮箱"

            # 2. 查找用户
            user = self.user_repo.find_by_id(request.user_id)
            if not user:
                return None, "用户不存在"

            # 3. 手机号绑定
            if request.phone:
                ok, err = validate_phone(request.phone)
                if not ok:
                    return None, err

                if not request.phone_code:
                    return None, "请输入手机验证码"

                # 校验手机号未被其他账号绑定
                existing = self.user_repo.find_by_phone(request.phone)
                if existing and existing.id != user.id:
                    return None, "该手机号已被其他账号绑定"

                # 校验验证码
                ok, err = self.verification_service.verify(
                    recipient=request.phone,
                    code_type=CODE_TYPE_PHONE_BIND,
                    code_value=request.phone_code,
                )
                if not ok:
                    return None, f"手机验证码错误：{err}"

                user.phone = request.phone
                user.phone_verified = True

            # 4. 邮箱绑定
            if request.email:
                ok, err = validate_email(request.email)
                if not ok:
                    return None, err

                if not request.email_code:
                    return None, "请输入邮箱验证码"

                # 校验邮箱未被其他账号绑定
                existing = self.user_repo.find_by_email(request.email)
                if existing and existing.id != user.id:
                    return None, "该邮箱已被其他账号绑定"

                # 校验验证码
                ok, err = self.verification_service.verify(
                    recipient=request.email,
                    code_type=CODE_TYPE_EMAIL_BIND,
                    code_value=request.email_code,
                )
                if not ok:
                    return None, f"邮箱验证码错误：{err}"

                user.email = request.email
                user.email_verified = True

            # 5. 判断是否完成绑定
            if user.phone_verified and user.email_verified and "@wechat.local" not in user.email:
                user.binding_completed_at = datetime.now(timezone.utc)

            # 6. 保存
            self.user_repo.save(user)

            return BindContactResponse(user=user), None

        except Exception as e:
            logger.error("绑定联系方式失败: %s", e, exc_info=True)
            return None, f"绑定失败: {str(e)}"


class SendVerificationCodeRequest:
    """发送验证码请求"""

    def __init__(self, target: str, value: str, purpose: str):
        self.target = target  # phone / email
        self.value = value.strip()
        self.purpose = purpose  # bind / login / reset_password


class SendVerificationCodeResponse:
    """发送验证码响应"""

    def __init__(self, expires_in: int, resend_after: int):
        self.expires_in = expires_in
        self.resend_after = resend_after

    def to_dict(self) -> dict:
        return {
            "expires_in": self.expires_in,
            "resend_after": self.resend_after,
        }


class SendVerificationCodeUseCase:
    """发送验证码用例"""

    def __init__(
        self,
        verification_code_service,
        sms_service=None,
        email_service=None,
    ):
        self.verification_service = verification_code_service
        self.sms_service = sms_service
        self.email_service = email_service

    def execute(
        self, request: SendVerificationCodeRequest
    ) -> tuple[Optional[SendVerificationCodeResponse], Optional[str]]:
        try:
            # 1. 确定 code_type
            if request.target == "phone":
                ok, err = validate_phone(request.value)
                if not ok:
                    return None, err
                code_type = f"{request.target}_{request.purpose}"
                recipient = normalize_phone(request.value)
            elif request.target == "email":
                ok, err = validate_email(request.value)
                if not ok:
                    return None, err
                code_type = f"{request.target}_{request.purpose}"
                recipient = request.value.lower()
            else:
                return None, f"不支持的目标类型: {request.target}"

            # 2. 生成验证码
            code_obj, err = self.verification_service.generate(recipient, code_type)
            if err:
                return None, err

            # 3. 发送
            if request.target == "phone" and self.sms_service:
                self.sms_service.send_verification_code(recipient, code_obj.code)
            elif request.target == "email" and self.email_service:
                subject = "验证码 - 小应剪辑"
                body = f"您的验证码是：{code_obj.code}，5分钟内有效。"
                self.email_service.send_email(recipient, subject, body)

            # 4. 返回
            ttl = (code_obj.expires_at - code_obj.created_at).total_seconds()
            return (
                SendVerificationCodeResponse(
                    expires_in=int(ttl),
                    resend_after=60,
                ),
                None,
            )

        except Exception as e:
            logger.error("发送验证码失败: %s", e, exc_info=True)
            return None, f"发送失败: {str(e)}"