"""Audit log API endpoints."""

from datetime import datetime
from typing import Optional
from fastapi import APIRouter, Depends, Query, HTTPException, status
from sqlalchemy.orm import Session

from app.dependencies import get_db, get_current_superuser
from app.models.user import User
from app import crud
from app.schemas.audit_log import (
    AuditLog,
    AuditLogList,
    AuditLogFilter,
    AuditLogStats
)


router = APIRouter()


@router.get("", response_model=AuditLogList)
def get_audit_logs(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
    page: int = Query(1, ge=1),
    page_size: int = Query(50, ge=1, le=100),
    user_id: Optional[str] = None,
    username: Optional[str] = None,
    action: Optional[str] = None,
    resource_type: Optional[str] = None,
    resource_id: Optional[str] = None,
    status_filter: Optional[str] = Query(None, alias="status"),
    start_date: Optional[datetime] = None,
    end_date: Optional[datetime] = None,
):
    """
    Get paginated audit logs with optional filtering.
    Requires superuser authentication.
    """
    filters = AuditLogFilter(
        user_id=user_id,
        username=username,
        action=action,
        resource_type=resource_type,
        resource_id=resource_id,
        status=status_filter,
        start_date=start_date,
        end_date=end_date
    )

    skip = (page - 1) * page_size
    items, total = crud.audit_log.get_multi(
        db, skip=skip, limit=page_size, filters=filters
    )

    total_pages = (total + page_size - 1) // page_size

    return AuditLogList(
        items=items,
        total=total,
        page=page,
        page_size=page_size,
        total_pages=total_pages
    )


@router.get("/stats", response_model=AuditLogStats)
def get_audit_stats(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
):
    """
    Get audit log statistics.
    Requires superuser authentication.
    """
    return crud.audit_log.get_stats(db)


@router.get("/actions")
def get_distinct_actions(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
):
    """
    Get list of distinct action types for filtering.
    """
    return {"actions": crud.audit_log.get_distinct_actions(db)}


@router.get("/resource-types")
def get_distinct_resource_types(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
):
    """
    Get list of distinct resource types for filtering.
    """
    return {"resource_types": crud.audit_log.get_distinct_resource_types(db)}


@router.get("/user/{user_id}", response_model=AuditLogList)
def get_user_audit_logs(
    user_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
    page: int = Query(1, ge=1),
    page_size: int = Query(50, ge=1, le=100),
):
    """
    Get audit logs for a specific user.
    Requires superuser authentication.
    """
    filters = AuditLogFilter(user_id=user_id)
    skip = (page - 1) * page_size
    items, total = crud.audit_log.get_multi(
        db, skip=skip, limit=page_size, filters=filters
    )

    total_pages = (total + page_size - 1) // page_size

    return AuditLogList(
        items=items,
        total=total,
        page=page,
        page_size=page_size,
        total_pages=total_pages
    )


@router.get("/{log_id}", response_model=AuditLog)
def get_audit_log(
    log_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
):
    """
    Get a specific audit log entry.
    Requires superuser authentication.
    """
    log = crud.audit_log.get(db, id=log_id)
    if not log:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Audit log not found"
        )
    return log


@router.delete("/cleanup")
def cleanup_old_logs(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_superuser),
    days: int = Query(90, ge=1, le=365),
):
    """
    Delete audit logs older than specified days.
    Requires superuser authentication.
    Default: 90 days.
    """
    deleted = crud.audit_log.delete_old(db, days=days)
    return {"deleted": deleted, "days_threshold": days}