"""Pydantic schemas for receipts API."""

from datetime import datetime, date
from decimal import Decimal
from typing import Optional, List
from pydantic import BaseModel, Field, ConfigDict

from app.db.models.receipt import ReceiptType, ReceiptDirection, ReceiptStatus
from app.db.models.accounting_entry import EntryType


# ============ Accounting Entry Schemas ============

class AccountingEntryBase(BaseModel):
    """Base schema for accounting entry."""
    entry_type: EntryType
    account_code: str = Field(max_length=20)
    account_name: Optional[str] = Field(default=None, max_length=200)
    amount: Decimal
    partner_id: Optional[int] = None
    cost_center_id: Optional[int] = None


class AccountingEntryCreate(AccountingEntryBase):
    """Schema for creating an accounting entry."""
    pass


class AccountingEntryUpdate(BaseModel):
    """Schema for updating an accounting entry."""
    entry_type: Optional[EntryType] = None
    account_code: Optional[str] = Field(default=None, max_length=20)
    account_name: Optional[str] = Field(default=None, max_length=200)
    amount: Optional[Decimal] = None
    partner_id: Optional[int] = None
    cost_center_id: Optional[int] = None


class AccountingEntryResponse(AccountingEntryBase):
    """Schema for accounting entry response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    receipt_id: int
    is_auto_generated: bool
    modified_by: Optional[str] = None
    modified_at: Optional[datetime] = None
    sort_order: int


# ============ Attachment Schemas ============

class AttachmentResponse(BaseModel):
    """Schema for attachment response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    receipt_id: int
    filename: str
    stored_filename: str
    file_path: str
    file_size: int
    mime_type: str
    uploaded_at: datetime


# ============ Receipt Schemas ============

class ReceiptBase(BaseModel):
    """Base schema for receipt."""
    receipt_type: ReceiptType = ReceiptType.BON_FISCAL
    direction: ReceiptDirection = ReceiptDirection.CHELTUIALA
    receipt_number: Optional[str] = Field(default=None, max_length=50)
    receipt_series: Optional[str] = Field(default=None, max_length=20)
    receipt_date: date
    amount: Decimal = Field(gt=0)
    description: Optional[str] = Field(default=None, max_length=500)
    expense_type_code: Optional[str] = Field(default=None, max_length=20)
    company_id: int
    partner_id: Optional[int] = None
    partner_name: Optional[str] = Field(default=None, max_length=200)
    cash_register_id: Optional[int] = None
    cash_register_name: Optional[str] = Field(default=None, max_length=100)
    cash_register_account: Optional[str] = Field(default=None, max_length=20)


class ReceiptCreate(ReceiptBase):
    """Schema for creating a receipt."""
    pass


class ReceiptUpdate(BaseModel):
    """Schema for updating a receipt (DRAFT only)."""
    receipt_type: Optional[ReceiptType] = None
    direction: Optional[ReceiptDirection] = None
    receipt_number: Optional[str] = Field(default=None, max_length=50)
    receipt_series: Optional[str] = Field(default=None, max_length=20)
    receipt_date: Optional[date] = None
    amount: Optional[Decimal] = Field(default=None, gt=0)
    description: Optional[str] = Field(default=None, max_length=500)
    expense_type_code: Optional[str] = Field(default=None, max_length=20)
    partner_id: Optional[int] = None
    partner_name: Optional[str] = Field(default=None, max_length=200)
    cash_register_id: Optional[int] = None
    cash_register_name: Optional[str] = Field(default=None, max_length=100)
    cash_register_account: Optional[str] = Field(default=None, max_length=20)


class ReceiptResponse(ReceiptBase):
    """Schema for receipt response with all fields."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    status: ReceiptStatus
    created_by: str
    created_at: datetime
    updated_at: datetime
    submitted_at: Optional[datetime] = None
    reviewed_by: Optional[str] = None
    reviewed_at: Optional[datetime] = None
    rejection_reason: Optional[str] = None
    oracle_synced_at: Optional[datetime] = None
    oracle_act_id: Optional[int] = None
    oracle_error: Optional[str] = None

    # Relationships (optional, loaded when needed)
    attachments: List[AttachmentResponse] = []
    entries: List[AccountingEntryResponse] = []


class ReceiptListResponse(BaseModel):
    """Schema for paginated receipt list response."""
    items: List[ReceiptResponse]
    total: int
    page: int
    page_size: int
    pages: int


class ReceiptFilter(BaseModel):
    """Schema for filtering receipts."""
    status: Optional[ReceiptStatus] = None
    company_id: Optional[int] = None
    created_by: Optional[str] = None
    date_from: Optional[date] = None
    date_to: Optional[date] = None
    search: Optional[str] = None  # Search in description, partner_name
    page: int = Field(default=1, ge=1)
    page_size: int = Field(default=20, ge=1, le=100)


# ============ Workflow Schemas ============

class WorkflowAction(BaseModel):
    """Schema for workflow action response."""
    success: bool
    message: str
    receipt: Optional[ReceiptResponse] = None


class RejectRequest(BaseModel):
    """Schema for rejection request."""
    reason: str = Field(min_length=5, max_length=500)


class EntriesUpdateRequest(BaseModel):
    """Schema for bulk updating accounting entries."""
    entries: List[AccountingEntryCreate]


# ============ Nomenclature Schemas ============

class PartnerOption(BaseModel):
    """Schema for partner dropdown option."""
    id: int
    name: str
    code: Optional[str] = None


class AccountOption(BaseModel):
    """Schema for account dropdown option."""
    code: str
    name: str


class CashRegisterOption(BaseModel):
    """Schema for cash register dropdown option."""
    id: int
    name: str
    account_code: str  # 5311, 5121, etc.


class ExpenseTypeOption(BaseModel):
    """Schema for expense type dropdown option."""
    code: str
    name: str
    account_code: str
    has_vat: bool
    vat_percent: Decimal = Decimal("19")