"""Update management API endpoints."""
from typing import Optional
from fastapi import APIRouter, HTTPException
from pydantic import BaseModel

from ..managers.update_manager import get_update_manager, UpdateStatus
from ..managers.ble_manager import get_ble_manager, NotificationType


router = APIRouter()


class UpdateCheckResponse(BaseModel):
    """Response model for update check."""
    update_available: bool
    current_version: str
    latest_version: Optional[str] = None
    release_date: Optional[str] = None
    changelog: Optional[str] = None
    is_prerelease: bool = False
    download_size: Optional[int] = None
    message: Optional[str] = None


class UpdateProgressResponse(BaseModel):
    """Response model for update progress."""
    status: str
    current_version: str
    available_version: Optional[str] = None
    download_progress: float = 0.0
    error_message: Optional[str] = None
    last_check: Optional[str] = None


class ReleaseNotesRequest(BaseModel):
    """Request model for release notes."""
    version: Optional[str] = None


@router.get("/check", response_model=UpdateCheckResponse)
async def check_for_updates():
    """Check for available updates.

    Returns:
        UpdateCheckResponse with update status and info
    """
    try:
        manager = get_update_manager()
        ble_manager = get_ble_manager()
        result = await manager.check_for_updates()

        # Send BLE notification if update is available
        if result.get("update_available"):
            await ble_manager.send_notification(
                NotificationType.UPDATE_AVAILABLE,
                f"Update available: v{result['latest_version']}",
                {"version": result["latest_version"]}
            )

        return UpdateCheckResponse(**result)

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/progress", response_model=UpdateProgressResponse)
async def get_update_progress():
    """Get current update progress.

    Returns:
        UpdateProgressResponse with current status
    """
    try:
        manager = get_update_manager()
        progress = await manager.get_progress()

        return UpdateProgressResponse(
            status=progress.status.value,
            current_version=progress.current_version,
            available_version=progress.available_version,
            download_progress=progress.download_progress,
            error_message=progress.error_message,
            last_check=progress.last_check
        )

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/download")
async def download_update():
    """Download the available update.

    Returns:
        Success message
    """
    try:
        manager = get_update_manager()
        success = await manager.download_update()

        if success:
            return {"message": "Update downloaded successfully"}
        else:
            raise HTTPException(status_code=500, detail="Download failed")

    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/install")
async def install_update():
    """Install the downloaded update.

    Returns:
        Success message
    """
    try:
        manager = get_update_manager()
        ble_manager = get_ble_manager()
        success = await manager.install_update()

        if success:
            # Send BLE notification
            await ble_manager.send_notification(
                NotificationType.UPDATE_COMPLETE,
                "Update installed successfully",
                {"restart_required": True}
            )

            return {
                "message": "Update installed successfully. Please restart the service.",
                "restart_required": True
            }
        else:
            raise HTTPException(status_code=500, detail="Installation failed")

    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/release-notes", response_model=dict)
async def get_release_notes(request: ReleaseNotesRequest):
    """Get release notes for a specific version.

    Args:
        request: Version to get notes for (latest if not specified)

    Returns:
        Release notes as markdown
    """
    try:
        manager = get_update_manager()
        notes = await manager.get_release_notes(request.version)

        return {
            "version": request.version or "latest",
            "notes": notes
        }

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/current-version")
async def get_current_version():
    """Get current system version.

    Returns:
        Current version info
    """
    try:
        manager = get_update_manager()
        progress = await manager.get_progress()

        return {
            "version": progress.current_version,
            "last_check": progress.last_check
        }

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))