"""Print job API endpoints."""

from datetime import datetime
from typing import Annotated, Optional

from fastapi import APIRouter, Depends, Query
from fastapi.encoders import jsonable_encoder
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from sqlalchemy.ext.asyncio import AsyncSession

from spoolman.api.v1.models import Message, Spool
from spoolman.database import print_job
from spoolman.database.database import get_db_session
from spoolman.database.models import PrintJob as DBPrintJob

router = APIRouter(
    prefix="/print-job",
    tags=["print-job"],
)


class PrintJobResponse(BaseModel):
    """Print job response model."""

    id: int
    spool_id: int
    spool: Optional[Spool] = None
    created: datetime
    finished: Optional[datetime] = None
    filename: str
    filament_used_g: float
    filament_used_mm: Optional[float] = None
    status: str

    @classmethod
    def from_db(cls, db_item: DBPrintJob) -> "PrintJobResponse":
        """Create from database model."""
        return cls(
            id=db_item.id,
            spool_id=db_item.spool_id,
            spool=Spool.from_db(db_item.spool) if db_item.spool else None,
            created=db_item.created,
            finished=db_item.finished,
            filename=db_item.filename,
            filament_used_g=db_item.filament_used_g,
            filament_used_mm=db_item.filament_used_mm,
            status=db_item.status,
        )


class CreatePrintJobRequest(BaseModel):
    """Request to create a print job."""

    spool_id: int = Field(..., description="ID of the spool to use.")
    filename: str = Field(..., max_length=256, description="G-code filename.")
    filament_used_g: float = Field(..., ge=0, description="Estimated filament usage in grams.")
    filament_used_mm: Optional[float] = Field(None, ge=0, description="Estimated filament usage in mm.")


class CompletePrintJobRequest(BaseModel):
    """Request to complete a print job."""

    comment: Optional[str] = Field(None, max_length=256, description="Optional comment for adjustment history.")


@router.get(
    "",
    name="List print jobs",
    description="Get a list of print jobs.",
    response_model_exclude_none=True,
    responses={200: {"model": list[PrintJobResponse]}},
)
async def find(
    *,
    db: Annotated[AsyncSession, Depends(get_db_session)],
    status: Annotated[
        Optional[str],
        Query(description="Filter by status: 'pending', 'completed', 'cancelled'."),
    ] = None,
    spool_id: Annotated[
        Optional[int],
        Query(description="Filter by spool ID."),
    ] = None,
    limit: Annotated[
        Optional[int],
        Query(description="Maximum number of items to return."),
    ] = None,
    offset: Annotated[
        int,
        Query(description="Offset for pagination."),
    ] = 0,
) -> JSONResponse:
    """Find print jobs."""
    db_items, total_count = await print_job.find(
        db=db,
        status=status,
        spool_id=spool_id,
        limit=limit,
        offset=offset,
    )
    return JSONResponse(
        content=jsonable_encoder(
            [PrintJobResponse.from_db(item) for item in db_items],
            exclude_none=True,
        ),
        headers={"x-total-count": str(total_count)},
    )


@router.get(
    "/{job_id}",
    name="Get print job",
    description="Get a specific print job.",
    response_model_exclude_none=True,
    responses={404: {"model": Message}},
)
async def get(
    db: Annotated[AsyncSession, Depends(get_db_session)],
    job_id: int,
) -> PrintJobResponse:
    """Get a print job by ID."""
    db_item = await print_job.get_by_id(db, job_id)
    return PrintJobResponse.from_db(db_item)


@router.post(
    "",
    name="Create print job",
    description="Create a new pending print job (called by slicer post-processing script).",
    response_model_exclude_none=True,
    responses={400: {"model": Message}, 404: {"model": Message}},
)
async def create(
    db: Annotated[AsyncSession, Depends(get_db_session)],
    body: CreatePrintJobRequest,
) -> PrintJobResponse:
    """Create a new print job."""
    db_item = await print_job.create(
        db=db,
        spool_id=body.spool_id,
        filename=body.filename,
        filament_used_g=body.filament_used_g,
        filament_used_mm=body.filament_used_mm,
    )
    return PrintJobResponse.from_db(db_item)


@router.post(
    "/{job_id}/complete",
    name="Complete print job",
    description="Mark a print job as completed - deducts filament from spool.",
    response_model_exclude_none=True,
    responses={400: {"model": Message}, 404: {"model": Message}},
)
async def complete(
    db: Annotated[AsyncSession, Depends(get_db_session)],
    job_id: int,
    body: Optional[CompletePrintJobRequest] = None,
) -> PrintJobResponse:
    """Complete a print job."""
    db_item = await print_job.complete(
        db=db,
        job_id=job_id,
        comment=body.comment if body else None,
    )
    return PrintJobResponse.from_db(db_item)


@router.post(
    "/{job_id}/cancel",
    name="Cancel print job",
    description="Mark a print job as cancelled - flags spool for manual weigh-in.",
    response_model_exclude_none=True,
    responses={400: {"model": Message}, 404: {"model": Message}},
)
async def cancel(
    db: Annotated[AsyncSession, Depends(get_db_session)],
    job_id: int,
) -> PrintJobResponse:
    """Cancel a print job."""
    db_item = await print_job.cancel(db=db, job_id=job_id)
    return PrintJobResponse.from_db(db_item)


@router.delete(
    "/{job_id}",
    name="Delete print job",
    description="Delete a print job.",
    response_model=Message,
    responses={404: {"model": Message}},
)
async def delete(
    db: Annotated[AsyncSession, Depends(get_db_session)],
    job_id: int,
) -> Message:
    """Delete a print job."""
    await print_job.delete(db=db, job_id=job_id)
    return Message(message="Success!")