"""
Pydantic schemas per API.
"""
from typing import Optional, Any, List
from datetime import datetime, date
from decimal import Decimal
from uuid import UUID
from enum import Enum
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 ======================

# Stati formali amendment (speculare BE Gepafin ApplicationAmendmentRequestEnum, ridotti)
class AmendmentStatus(str, Enum):
    DRAFT = "DRAFT"                            # istruttore prepara, PEC non ancora partita
    AWAITING = "AWAITING"                      # PEC inviata, attendo risposta benef
    RESPONSE_RECEIVED = "RESPONSE_RECEIVED"    # benef ha risposto, istruttore deve valutare
    EXPIRED = "EXPIRED"                        # deadline passata senza risposta (scheduler)
    CLOSED = "CLOSED"                          # istruttore chiude dopo response o comunque


class AmendmentRequestCreate(BaseModel):
    request_text: str
    deadline: date
    scope: Optional[dict] = None
    response_days: Optional[int] = None        # pre-compilato default 15gg, variabile per istruttore
    internal_note: Optional[str] = None        # visibile solo istruttore


class AmendmentRequestUpdate(BaseModel):
    """Modifica amendment solo in stato DRAFT."""
    request_text: Optional[str] = None
    deadline: Optional[date] = None
    scope: Optional[dict] = None
    response_days: Optional[int] = None
    internal_note: Optional[str] = None


class AmendmentExtend(BaseModel):
    """Prolunga la deadline di un amendment AWAITING."""
    extended_days: int = Field(..., gt=0, le=60)
    motivation: Optional[str] = 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

    # soccorso v3
    response_days: Optional[int] = None
    extended_days: Optional[int] = None
    extension_date: Optional[datetime] = None
    internal_note: Optional[str] = None
    amendment_document_path: Optional[str] = None
    amendment_document_type: Optional[str] = None
    response_document_path: Optional[str] = None
    response_document_type: Optional[str] = None
    protocol_id: Optional[str] = None
    pec_sent_at: Optional[datetime] = None
    pec_failed_reason: Optional[str] = None

    model_config = {"from_attributes": True}


# ===== schemas per endpoint interni chiamati dal BE Gepafin =====

class AmendmentPendingPecOut(BaseModel):
    """Lista amendment che il BE deve processare per invio PEC."""
    id: UUID
    practice_id: UUID
    application_id: int
    request_text: str
    deadline: date
    response_days: Optional[int] = None
    amendment_document_path: Optional[str] = None
    created_at: datetime


class AmendmentPecDetail(BaseModel):
    """Dettaglio richiesto dal BE per comporre PEC."""
    id: UUID
    practice_id: UUID
    application_id: int
    company_id: int
    call_id: int
    sequence_number: int
    period_label: Optional[str] = None
    request_text: str
    deadline: date
    response_days: Optional[int] = None
    amendment_document_path: Optional[str] = None


class MarkPecSent(BaseModel):
    protocol_id: str
    email_log_id: Optional[int] = None
    user_action_id: Optional[int] = None
    pec_sent_at: Optional[datetime] = None


class MarkPecFailed(BaseModel):
    reason: str
    retry_after: Optional[datetime] = None


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