from __future__ import annotations

from datetime import datetime

from pydantic import BaseModel, Field


class CreditSubscriptionPeriodOut(BaseModel):
    id: str
    sequence: int
    scheduled_at: datetime
    valid_from: datetime
    expires_at: datetime
    grant_credits: float
    allocated_paid_amount: float
    status: str
    status_label: str = ""
    issued_balance_id: str | None = None
    issued_at: datetime | None = None

    model_config = {"from_attributes": True}


class CreditSubscriptionOut(BaseModel):
    id: str
    subscription_no: str
    user_id: str
    team_id: str | None = None
    team_manager_id_snapshot: str | None = None
    product_id: str | None = None
    payment_order_id: str
    status: str
    status_label: str = ""
    purchase_scene: str
    product_type_snapshot: str
    product_type_label: str = ""
    product_name_snapshot: str
    tier_code: str
    tier_rank: int
    billing_cycle: str
    billing_cycle_label: str = ""
    anchor_at: datetime
    start_at: datetime
    expires_at: datetime
    next_grant_at: datetime | None = None
    monthly_grant_credits_snapshot: float
    monthly_total_credits_snapshot: float
    quantity_snapshot: int = 1
    grant_count: int
    granted_count: int
    first_purchase_price_snapshot: float
    regular_price_snapshot: float
    activity_price_snapshot: float | None = None
    actual_unit_price_snapshot: float
    paid_amount_snapshot: float
    periods: list[CreditSubscriptionPeriodOut] = Field(default_factory=list)

    model_config = {"from_attributes": True}


class AdminOfflineSubscriptionCreate(BaseModel):
    product_id: str
    quantity: int = Field(default=1, ge=1, le=1000)
    payment_method: str = Field(pattern="^(bank_transfer|cash|other)$")
    actual_paid_amount: float | None = Field(default=None, ge=0)
    offline_trade_no: str | None = Field(default=None, max_length=128)
    offline_payment_detail: str | None = Field(default=None, max_length=128)
    remark: str | None = Field(default=None, max_length=512)