"""
Endpoint gestione schema rendicontazione per bando.
"""
import copy
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from sqlalchemy.exc import IntegrityError
from ..db import get_db
from ..auth import AuthUser, get_current_user, require_superadmin
from ..models import CallRemissionSchema
from ..schemas import RemissionSchemaOut, RemissionSchemaCreate, RemissionSchemaUpdate, ApiResponse
from ..templates import RESTART_TEMPLATE

router = APIRouter(prefix="/api/rendicontazione-schemas", tags=["rendicontazione-schemas"])


@router.get("/{call_id}", response_model=ApiResponse)
def get_schema(call_id: int, db: Session = Depends(get_db), user: AuthUser = Depends(get_current_user)):
    """Legge lo schema di rendicontazione per un bando. 404 se non esiste."""
    schema = db.query(CallRemissionSchema).filter(CallRemissionSchema.call_id == call_id).first()
    if not schema:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Nessuno schema di rendicontazione per call_id={call_id}. Usa POST per crearlo.",
        )
    return ApiResponse(data=RemissionSchemaOut.model_validate(schema).model_dump(mode="json"))


@router.post("/{call_id}", response_model=ApiResponse)
def create_schema(
    call_id: int,
    body: RemissionSchemaCreate,
    db: Session = Depends(get_db),
    user: AuthUser = Depends(require_superadmin),
):
    """Crea uno schema di rendicontazione per un bando. Fallisce se esiste già."""
    existing = db.query(CallRemissionSchema).filter(CallRemissionSchema.call_id == call_id).first()
    if existing:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Schema già esistente per call_id={call_id}. Usa PUT per aggiornarlo.",
        )
    schema = CallRemissionSchema(
        call_id=call_id,
        schema_json=body.schema_json,
        status="DRAFT",
        created_by=user.user_id,
    )
    db.add(schema)
    db.commit()
    db.refresh(schema)
    return ApiResponse(
        message=f"Schema creato per call_id={call_id}",
        data=RemissionSchemaOut.model_validate(schema).model_dump(mode="json"),
    )


@router.put("/{call_id}", response_model=ApiResponse)
def update_schema(
    call_id: int,
    body: RemissionSchemaUpdate,
    db: Session = Depends(get_db),
    user: AuthUser = Depends(require_superadmin),
):
    """Aggiorna schema esistente. Blocca modifiche se già PUBLISHED."""
    schema = db.query(CallRemissionSchema).filter(CallRemissionSchema.call_id == call_id).first()
    if not schema:
        raise HTTPException(status_code=404, detail=f"Schema non trovato per call_id={call_id}")
    if schema.status == "PUBLISHED":
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Schema PUBLISHED non modificabile. Crea una nuova versione.",
        )
    if body.schema_json is not None:
        schema.schema_json = body.schema_json
    db.commit()
    db.refresh(schema)
    return ApiResponse(
        message=f"Schema aggiornato per call_id={call_id}",
        data=RemissionSchemaOut.model_validate(schema).model_dump(mode="json"),
    )


@router.post("/{call_id}/initialize-restart", response_model=ApiResponse)
def initialize_restart(
    call_id: int,
    db: Session = Depends(get_db),
    user: AuthUser = Depends(require_superadmin),
):
    """Inizializza schema per un bando usando il template RE-START. Fallisce se esiste già."""
    existing = db.query(CallRemissionSchema).filter(CallRemissionSchema.call_id == call_id).first()
    if existing:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Schema già esistente per call_id={call_id}. Usa PUT per modificarlo.",
        )
    schema = CallRemissionSchema(
        call_id=call_id,
        schema_json=copy.deepcopy(RESTART_TEMPLATE),
        status="DRAFT",
        created_by=user.user_id,
    )
    db.add(schema)
    db.commit()
    db.refresh(schema)
    return ApiResponse(
        message=f"Schema RE-START inizializzato per call_id={call_id}",
        data=RemissionSchemaOut.model_validate(schema).model_dump(mode="json"),
    )


@router.post("/{call_id}/publish", response_model=ApiResponse)
def publish_schema(
    call_id: int,
    db: Session = Depends(get_db),
    user: AuthUser = Depends(require_superadmin),
):
    """Pubblica lo schema (status DRAFT -> PUBLISHED). Una volta pubblicato, non è più editabile."""
    from datetime import datetime, timezone
    schema = db.query(CallRemissionSchema).filter(CallRemissionSchema.call_id == call_id).first()
    if not schema:
        raise HTTPException(status_code=404, detail=f"Schema non trovato per call_id={call_id}")
    if schema.status == "PUBLISHED":
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Schema già pubblicato.",
        )
    schema.status = "PUBLISHED"
    schema.published_at = datetime.now(timezone.utc)
    schema.published_by = user.user_id
    db.commit()
    db.refresh(schema)
    return ApiResponse(
        message=f"Schema pubblicato per call_id={call_id}",
        data=RemissionSchemaOut.model_validate(schema).model_dump(mode="json"),
    )


@router.delete("/{call_id}", response_model=ApiResponse)
def delete_schema(
    call_id: int,
    db: Session = Depends(get_db),
    user: AuthUser = Depends(require_superadmin),
):
    """Cancella schema. Consentito solo in DRAFT."""
    schema = db.query(CallRemissionSchema).filter(CallRemissionSchema.call_id == call_id).first()
    if not schema:
        raise HTTPException(status_code=404, detail=f"Schema non trovato per call_id={call_id}")
    if schema.status == "PUBLISHED":
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Schema PUBLISHED non cancellabile.",
        )
    db.delete(schema)
    db.commit()
    return ApiResponse(message=f"Schema cancellato per call_id={call_id}")


@router.get("/templates/restart", response_model=ApiResponse)
def get_restart_template(user: AuthUser = Depends(require_superadmin)):
    """Restituisce il template RE-START senza persisterlo. Utile per preview."""
    return ApiResponse(data=RESTART_TEMPLATE)