"""
财务票据域 Pydantic V2 Schemas
票据池 / 报销单（嵌套明细）/ 审批状态变更
"""

from __future__ import annotations

import uuid
from datetime import date, datetime
from typing import Any

from pydantic import BaseModel, Field


# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# 票据池
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
class InvoiceCreate(BaseModel):
    file_url: str | None = Field(default=None, max_length=500)
    merchant_name: str | None = Field(default=None, max_length=200)
    amount: float = Field(default=0, ge=0)
    invoice_date: date | None = None
    type: str = Field(default="expense", pattern=r"^(expense|customer)$")
    ai_extracted_data: dict[str, Any] = Field(
        default_factory=dict,
        description="OCR/AI 解析的结构化数据 (JSONB)",
        examples=[{"merchant": "中国石化", "amount": 580.00, "date": "2026-02-20"}],
    )


class InvoiceResponse(BaseModel):
    id: uuid.UUID
    uploader_id: uuid.UUID | None = None
    uploader_name: str | None = None
    file_url: str | None = None
    merchant_name: str | None = None
    amount: float = 0
    invoice_date: date | None = None
    type: str
    ai_extracted_data: dict[str, Any] = Field(default_factory=dict)
    is_used: bool = False
    created_at: datetime

    model_config = {"from_attributes": True}


class InvoiceListResponse(BaseModel):
    total: int
    items: list[InvoiceResponse]
    page: int
    size: int


# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# 报销单创建（嵌套明细）
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
class ExpenseDetailCreate(BaseModel):
    invoice_id: uuid.UUID = Field(..., description="关联发票 ID")
    expense_desc: str | None = Field(default=None, max_length=500)
    expense_date: date | None = Field(default=None, description="费用发生日期")
    original_type: str | None = Field(
        default=None, max_length=50, examples=["fuel", "entertainment", "travel", "office"]
    )
    offset_type: str | None = Field(default=None, max_length=50)
    amount: float = Field(..., gt=0, description="本行报销金额")


class ExpenseCreate(BaseModel):
    total_amount: float = Field(..., gt=0)
    remark: str | None = None
    items: list[ExpenseDetailCreate] = Field(..., min_length=1)


# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# 报销明细响应
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
class ExpenseDetailResponse(BaseModel):
    id: uuid.UUID
    invoice_id: uuid.UUID | None = None
    invoice_merchant: str | None = None
    invoice_amount: float | None = None
    expense_desc: str | None = None
    expense_date: date | None = None
    original_type: str | None = None
    offset_type: str | None = None
    amount: float = 0

    model_config = {"from_attributes": True}


# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# 报销单响应
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
class ExpenseResponse(BaseModel):
    id: uuid.UUID
    system_no: str
    applicant_id: uuid.UUID
    applicant_name: str | None = None
    total_amount: float
    status: str
    remark: str | None = None
    approved_by: uuid.UUID | None = None
    approver_name: str | None = None
    approved_at: datetime | None = None
    details: list[ExpenseDetailResponse] = Field(default_factory=list)
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}


class ExpenseBriefResponse(BaseModel):
    id: uuid.UUID
    system_no: str
    applicant_id: uuid.UUID
    applicant_name: str | None = None
    total_amount: float
    status: str
    created_at: datetime

    model_config = {"from_attributes": True}


class ExpenseListResponse(BaseModel):
    total: int
    items: list[ExpenseBriefResponse]
    page: int
    size: int


# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# 审批状态变更
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
class ExpenseStatusUpdate(BaseModel):
    action: str = Field(
        ..., pattern=r"^(withdraw|approve|reject)$",
        description="状态变更动作: withdraw/approve/reject",
    )
    reason: str | None = Field(default=None, description="审批意见或驳回原因")