"""
Pydantic schemas per API.
"""
from typing import Optional, Any, List
from datetime import datetime, date
from decimal import Decimal
from uuid import UUID
from pydantic import BaseModel, Field


# ====================== Schema di rendicontazione (bando) ======================

class RemissionSchemaBase(BaseModel):
    schema_json: dict


class RemissionSchemaCreate(RemissionSchemaBase):
    pass


class RemissionSchemaUpdate(BaseModel):
    schema_json: Optional[dict] = None


class RemissionSchemaOut(BaseModel):
    id: UUID
    call_id: int
    schema_version: int
    status: str
    schema_json: dict
    created_by: int
    created_at: datetime
    updated_at: datetime
    published_at: Optional[datetime] = None
    published_by: Optional[int] = None

    model_config = {"from_attributes": True}


# ====================== Pratica di rendicontazione (beneficiario) ======================

class PracticeStartRequest(BaseModel):
    """Input per avviare una (nuova) pratica o tranche."""
    application_id: int
    period_label: Optional[str] = None  # es "I trimestre 2021" — libero
    copy_ula_from_previous: bool = True  # ignorato se e la prima tranche


class PracticeUpdate(BaseModel):
    iva_regime: Optional[str] = None
    notes_beneficiario: Optional[str] = None


# Fattura
class InvoiceCreate(BaseModel):
    category_code: str
    invoice_number: str
    invoice_date: date
    payment_date: date
    supplier_name: str
    supplier_vat: str
    description: str
    taxable: Decimal
    vat: Decimal = Decimal("0")
    total: Decimal
    pdf_filename: Optional[str] = None


class InvoiceOut(InvoiceCreate):
    id: UUID
    practice_id: UUID
    created_at: datetime
    # istruttoria
    taxable_verified: Optional[Decimal] = None
    vat_verified: Optional[Decimal] = None
    total_verified: Optional[Decimal] = None
    verification_status: str = "PENDING"
    verification_notes: Optional[str] = None
    date_checks: Optional[dict] = None
    verified_by: Optional[int] = None
    verified_at: Optional[datetime] = None

    model_config = {"from_attributes": True}


# ULA Employee
class UlaEmployeeCreate(BaseModel):
    codice_fiscale: str
    full_name: str
    contract_type: str
    role_description: Optional[str] = None
    fte_pct: Decimal = Decimal("1")
    period_start_date: date
    period_end_date: date
    supporting_doc_type: Optional[str] = None
    supporting_doc_filename: Optional[str] = None


class UlaEmployeeOut(UlaEmployeeCreate):
    id: UUID
    practice_id: UUID
    created_at: datetime
    # istruttoria
    fte_pct_verified: Optional[Decimal] = None
    verification_status: str = "PENDING"
    verification_notes: Optional[str] = None
    verified_by: Optional[int] = None
    verified_at: Optional[datetime] = None

    model_config = {"from_attributes": True}


# Document
class DocumentUpsert(BaseModel):
    doc_code: str
    filename: Optional[str] = None
    uploaded_at: Optional[datetime] = None
    expires_at: Optional[date] = None
    notes: Optional[str] = None
    source_company_document_id: Optional[int] = None


class DocumentOut(BaseModel):
    id: UUID
    practice_id: UUID
    doc_code: str
    filename: Optional[str] = None
    uploaded_at: Optional[datetime] = None
    expires_at: Optional[date] = None
    notes: Optional[str] = None
    source_company_document_id: Optional[int] = None
    # istruttoria
    verification_status: str = "PENDING"
    verification_notes: Optional[str] = None
    verified_by: Optional[int] = None
    verified_at: Optional[datetime] = None

    model_config = {"from_attributes": True}


# Pratica dettagliata
class PracticeOut(BaseModel):
    id: UUID
    call_id: int
    application_id: int
    company_id: int
    user_id: int
    status: str
    schema_snapshot: dict
    iva_regime: Optional[str] = None
    amount_erogato: Decimal
    notes_beneficiario: Optional[str] = None
    created_at: datetime
    updated_at: datetime
    submitted_at: Optional[datetime] = None

    # istruttoria
    assigned_instructor_id: Optional[int] = None
    reviewed_at: Optional[datetime] = None
    reviewed_by: Optional[int] = None
    rejection_reason: Optional[str] = None
    approved_remission: Optional[Decimal] = None
    instructor_final_notes: Optional[str] = None
    instructor_checklist: Optional[dict] = None
    verbale_date: Optional[date] = None

    # v2 multi-tranche
    sequence_number: int = 1
    period_label: Optional[str] = None
    suggested_instructor_id: Optional[int] = None

    invoices: List[InvoiceOut] = []
    ula_employees: List[UlaEmployeeOut] = []
    documents: List[DocumentOut] = []

    model_config = {"from_attributes": True}


class PracticeListItem(BaseModel):
    """Riga leggera per liste."""
    id: UUID
    call_id: int
    application_id: int
    company_id: int
    status: str
    amount_erogato: Decimal
    created_at: datetime
    submitted_at: Optional[datetime] = None

    # v2 multi-tranche
    sequence_number: int = 1
    period_label: Optional[str] = None
    suggested_instructor_id: Optional[int] = None

    # campi denormalizzati aggiunti a runtime
    call_name: Optional[str] = None
    company_name: Optional[str] = None
    invoice_count: int = 0
    ula_count: int = 0
    document_count: int = 0

    model_config = {"from_attributes": True}


# Gate check
class GateCheckResult(BaseModel):
    passed: bool
    checks: List[dict]  # [{id, label, passed, detail}]
    totals: dict        # {per_category: {B1: 1234.56, ...}, grand_total, max_remission_due, ...}


# ====================== Istruttoria ======================

class AmendmentRequestCreate(BaseModel):
    request_text: str
    deadline: date
    scope: Optional[dict] = None


class AmendmentResponseSubmit(BaseModel):
    response_text: str


class AmendmentRequestOut(BaseModel):
    id: UUID
    practice_id: UUID
    requested_by: int
    request_text: str
    scope: Optional[dict] = None
    deadline: date
    status: str
    response_text: Optional[str] = None
    response_at: Optional[datetime] = None
    closed_at: Optional[datetime] = None
    closed_by: Optional[int] = None
    created_at: datetime

    model_config = {"from_attributes": True}


class ReviewRejectBody(BaseModel):
    rejection_reason: str


class ReviewApproveBody(BaseModel):
    approved_remission: Optional[Decimal] = None
    notes: Optional[str] = None


class InstructorQueueItem(BaseModel):
    id: UUID
    call_id: int
    application_id: int
    sequence_number: int = 1
    period_label: Optional[str] = None
    suggested_instructor_id: Optional[int] = None
    company_id: int
    status: str
    amount_erogato: Decimal
    submitted_at: Optional[datetime] = None
    assigned_instructor_id: Optional[int] = None
    call_name: Optional[str] = None
    company_name: Optional[str] = None
    invoice_count: int = 0
    ula_count: int = 0
    document_count: int = 0
    open_amendments: int = 0
    remission_due: Optional[float] = None

    model_config = {"from_attributes": True}



# Verifica singola fattura
class InvoiceVerifyBody(BaseModel):
    verification_status: str  # AMMESSA | PARZIALE | RESPINTA
    taxable_verified: Optional[Decimal] = None
    vat_verified: Optional[Decimal] = None
    total_verified: Optional[Decimal] = None
    verification_notes: Optional[str] = None


# Verifica singolo dipendente ULA
class UlaVerifyBody(BaseModel):
    verification_status: str  # AMMESSA | PARZIALE | RESPINTA
    fte_pct_verified: Optional[Decimal] = None
    verification_notes: Optional[str] = None


# Verifica singolo documento
class DocumentVerifyBody(BaseModel):
    verification_status: str  # VALIDO | NON_VALIDO | SCADUTO
    verification_notes: Optional[str] = None


# Note finali istruttore + checklist
class InstructorFinalNotesBody(BaseModel):
    instructor_final_notes: Optional[str] = None
    instructor_checklist: Optional[dict] = None


# ====================== Wrapper ======================

class ApiResponse(BaseModel):
    status: str = "SUCCESS"
    message: Optional[str] = None
    data: Optional[Any] = None


# ====================== v2 Custom checks ======================

class CustomCheckDeclareBody(BaseModel):
    beneficiary_declared: bool


class CustomCheckVerifyBody(BaseModel):
    verification_status: str  # PENDING | VALIDO | NON_VALIDO
    verification_notes: Optional[str] = None


class CustomCheckOut(BaseModel):
    """Vista merged di definition (da schema) + value (dal DB)."""
    code: str
    label: str
    description: Optional[str] = None
    requires_document: bool = False
    required: bool = False
    # valori
    beneficiary_declared: bool = False
    declared_at: Optional[datetime] = None
    filename_original: Optional[str] = None
    storage_path: Optional[str] = None
    size_bytes: Optional[int] = None
    document_uploaded_at: Optional[datetime] = None
    verification_status: str = "PENDING"
    verification_notes: Optional[str] = None
    verified_by: Optional[int] = None
    verified_at: Optional[datetime] = None


# ====================== v2 Reassign istruttore ======================

class PracticeReassignBody(BaseModel):
    new_instructor_id: Optional[int] = None  # None = unassign ritorno in coda
    reassignment_reason: Optional[str] = None


# ====================== v2 Tranches ======================

class ApplicationTranchesSummary(BaseModel):
    """Riepilogo pratiche/tranche per una application."""
    application_id: int
    call_id: int
    call_name: Optional[str] = None
    company_id: int
    company_name: Optional[str] = None
    amount_erogato: float
    max_tranches: int = 1
    # summary tranche esistenti
    tranches: List[PracticeListItem] = []
    # stato apertura nuova tranche
    can_start_new: bool = False
    start_blocked_reason: Optional[str] = None
    # importi cumulativi
    already_approved_sum: float = 0
    max_remission_global: float = 0
    max_remission_next_tranche: float = 0


class CopyUlaOption(BaseModel):
    """Dipendente copiabile da tranche precedente."""
    codice_fiscale: str
    full_name: str
    contract_type: str
    role_description: Optional[str] = None
    fte_pct: float
    period_start_date: date
    period_end_date: date
    supporting_doc_type: Optional[str] = None