yingqing/core/backend/apps/accounts/serializers.py

from rest_framework import serializers

from apps.billing.models import CreditAccount, CreditLedger

from .models import Invitation, LoginSession, Team, TeamMember, User, UserPreference


class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ["id", "username", "first_name", "last_name", "email", "phone", "avatar_url", "status"]
        read_only_fields = ["id", "status"]


class UserPreferenceSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserPreference
        fields = ["notify", "two_factor_enabled", "creation_defaults", "display", "updated_at"]
        read_only_fields = ["updated_at"]


class LoginSessionSerializer(serializers.ModelSerializer):
    is_current = serializers.SerializerMethodField()

    class Meta:
        model = LoginSession
        fields = ["id", "user_agent", "ip_address", "last_seen_at", "created_at", "is_current"]
        read_only_fields = fields

    def get_is_current(self, obj) -> bool:
        ctx = self.context or {}
        return bool(obj.ip_address and obj.ip_address == ctx.get("current_ip") and obj.user_agent == ctx.get("current_ua"))


class TeamSerializer(serializers.ModelSerializer):
    class Meta:
        model = Team
        fields = ["id", "name", "status", "owner", "created_at", "updated_at"]
        read_only_fields = ["id", "status", "owner", "created_at", "updated_at"]


class TeamMemberSerializer(serializers.ModelSerializer):
    user = UserSerializer(read_only=True)
    # 本月已消费(自然月,按 CreditLedger CHARGE 流水按人聚合);由 view 经 context 注入 charged_map
    month_charged = serializers.SerializerMethodField()

    class Meta:
        model = TeamMember
        fields = ["id", "team", "user", "role", "status", "monthly_credit_limit", "month_charged"]
        read_only_fields = ["id", "team", "user", "status"]

    def get_month_charged(self, obj):
        charged_map = self.context.get("charged_map") or {}
        return str(charged_map.get(obj.user_id, 0))


class RegisterSerializer(serializers.Serializer):
    username = serializers.CharField(max_length=150)
    password = serializers.CharField(min_length=8, write_only=True)
    email = serializers.EmailField(required=False, allow_blank=True)
    team_name = serializers.CharField(max_length=128, required=False, allow_blank=True)
    # 邀请码(可选):有效码 → 加入已有团队;空 → 开新团队当超管。认证定调:不用邮箱注册,username 为主标识。
    invite_code = serializers.CharField(max_length=32, required=False, allow_blank=True)

    def validate_username(self, value):
        if User.objects.filter(username=value).exists():
            raise serializers.ValidationError("username already exists")
        return value

    def validate_invite_code(self, value):
        code = (value or "").strip().upper()
        if not code:
            return ""
        from django.utils import timezone

        from .models import Invitation

        inv = Invitation.objects.filter(code=code).first()
        if inv is None:
            raise serializers.ValidationError("邀请码不存在")
        if inv.status != Invitation.Status.PENDING:
            raise serializers.ValidationError("邀请码已被使用或已撤销")
        if inv.expires_at <= timezone.now():
            raise serializers.ValidationError("邀请码已过期")
        return code

    def create(self, validated_data):
        from decimal import Decimal

        from django.conf import settings
        from django.db import transaction
        from django.utils import timezone

        from .models import Invitation

        invite_code = (validated_data.get("invite_code") or "").strip().upper()
        with transaction.atomic():
            user = User.objects.create_user(
                username=validated_data["username"],
                password=validated_data["password"],
                email=validated_data.get("email", ""),
            )
            if invite_code:
                # 凭码加入已有团队:幂等加成员(避开 unique_together 撞 IntegrityError)、标邀请 used、
                # 整段跳过 CreditAccount + ledger(团队级 OneToOne 已存在,二次建必报错、额度也不重发)。
                inv = Invitation.objects.select_for_update().filter(code=invite_code).first()
                if inv is None or inv.status != Invitation.Status.PENDING or inv.expires_at <= timezone.now():
                    raise serializers.ValidationError({"invite_code": "邀请码已失效"})
                team = inv.team
                role = inv.role
                if role == TeamMember.Role.OWNER:
                    role = TeamMember.Role.ADMIN  # 不允许 OWNER(Team.owner 唯一)
                TeamMember.objects.get_or_create(
                    team=team,
                    user=user,
                    defaults={
                        "role": role,
                        "status": TeamMember.Status.ACTIVE,
                        "monthly_credit_limit": inv.monthly_credit_limit,
                    },
                )
                inv.status = Invitation.Status.USED
                inv.used_by = user
                inv.used_at = timezone.now()
                inv.save(update_fields=["status", "used_by", "used_at", "updated_at"])
            else:
                # 无码:开新团队当 owner + 发试用额度(原逻辑)
                team = Team.objects.create(
                    name=validated_data.get("team_name") or f"{user.username}'s Team",
                    owner=user,
                )
                TeamMember.objects.create(team=team, user=user, role=TeamMember.Role.OWNER)
                trial = Decimal(str(settings.DEFAULT_TRIAL_CREDITS))
                CreditAccount.objects.create(team=team, balance=trial)
                # 开户赠送额度必须进流水,否则这笔钱在账单里查无凭证、无法对账(余额从第一条起就可追溯)
                if trial > 0:
                    CreditLedger.objects.create(
                        team=team,
                        user=user,
                        ledger_type=CreditLedger.Type.RECHARGE,
                        amount=trial,
                        balance_after=trial,
                        reason="新用户试用额度赠送",
                        metadata={"kind": "trial_grant"},
                    )
        return {"user": user, "team": team}


class InvitationSerializer(serializers.ModelSerializer):
    used_by_username = serializers.CharField(source="used_by.username", read_only=True, default=None)
    register_url = serializers.SerializerMethodField()

    class Meta:
        model = Invitation
        fields = [
            "id", "code", "role", "email", "monthly_credit_limit", "status",
            "expires_at", "used_by", "used_by_username", "used_at", "created_at", "register_url",
        ]
        read_only_fields = fields

    def get_register_url(self, obj):
        return f"/register?invite={obj.code}"


class LoginSerializer(serializers.Serializer):
    username = serializers.CharField()
    password = serializers.CharField(write_only=True)