# app/api/v1/admin/settings.py
"""
Platform settings management endpoints.

Provides endpoints for:
- Viewing all platform settings
- Creating/updating settings
- Managing configuration by category
"""

import logging

from fastapi import APIRouter, Depends, Query
from sqlalchemy.orm import Session

from app.api.deps import get_current_admin_api
from app.core.database import get_db
from app.exceptions import ConfirmationRequiredException, ResourceNotFoundException
from app.services.admin_audit_service import admin_audit_service
from app.services.admin_settings_service import admin_settings_service
from models.database.user import User
from models.schema.admin import (
    AdminSettingCreate,
    AdminSettingListResponse,
    AdminSettingResponse,
    AdminSettingUpdate,
    PublicDisplaySettingsResponse,
    RowsPerPageResponse,
    RowsPerPageUpdateResponse,
)

router = APIRouter(prefix="/settings")
logger = logging.getLogger(__name__)


@router.get("", response_model=AdminSettingListResponse)
def get_all_settings(
    category: str | None = Query(None, description="Filter by category"),
    is_public: bool | None = Query(None, description="Filter by public flag"),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Get all platform settings.

    Can be filtered by category (system, security, marketplace, notifications)
    and by public flag (settings that can be exposed to frontend).
    """
    settings = admin_settings_service.get_all_settings(db, category, is_public)

    return AdminSettingListResponse(
        settings=settings, total=len(settings), category=category
    )


@router.get("/categories")
def get_setting_categories(
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """Get list of all setting categories."""
    # This could be enhanced to return counts per category
    return {
        "categories": [
            "system",
            "security",
            "marketplace",
            "notifications",
            "integrations",
            "payments",
        ]
    }


@router.get("/{key}", response_model=AdminSettingResponse)
def get_setting(
    key: str,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """Get specific setting by key."""
    setting = admin_settings_service.get_setting_by_key(db, key)

    if not setting:
        raise ResourceNotFoundException(resource_type="Setting", identifier=key)

    return AdminSettingResponse.model_validate(setting)


@router.post("", response_model=AdminSettingResponse)
def create_setting(
    setting_data: AdminSettingCreate,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Create new platform setting.

    Setting keys should be lowercase with underscores (e.g., max_vendors_allowed).
    """
    result = admin_settings_service.create_setting(
        db=db, setting_data=setting_data, admin_user_id=current_admin.id
    )

    # Log action
    admin_audit_service.log_action(
        db=db,
        admin_user_id=current_admin.id,
        action="create_setting",
        target_type="setting",
        target_id=setting_data.key,
        details={
            "category": setting_data.category,
            "value_type": setting_data.value_type,
        },
    )
    db.commit()

    return result


@router.put("/{key}", response_model=AdminSettingResponse)
def update_setting(
    key: str,
    update_data: AdminSettingUpdate,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """Update existing setting value."""
    old_value = admin_settings_service.get_setting_value(db, key)

    result = admin_settings_service.update_setting(
        db=db, key=key, update_data=update_data, admin_user_id=current_admin.id
    )

    # Log action
    admin_audit_service.log_action(
        db=db,
        admin_user_id=current_admin.id,
        action="update_setting",
        target_type="setting",
        target_id=key,
        details={"old_value": str(old_value), "new_value": update_data.value},
    )
    db.commit()

    return result


@router.post("/upsert", response_model=AdminSettingResponse)
def upsert_setting(
    setting_data: AdminSettingCreate,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Create or update setting (upsert).

    If setting exists, updates its value. If not, creates new setting.
    """
    result = admin_settings_service.upsert_setting(
        db=db, setting_data=setting_data, admin_user_id=current_admin.id
    )

    # Log action
    admin_audit_service.log_action(
        db=db,
        admin_user_id=current_admin.id,
        action="upsert_setting",
        target_type="setting",
        target_id=setting_data.key,
        details={"category": setting_data.category},
    )
    db.commit()

    return result


# ============================================================================
# CONVENIENCE ENDPOINTS FOR COMMON SETTINGS
# ============================================================================


@router.get("/display/rows-per-page", response_model=RowsPerPageResponse)
def get_rows_per_page(
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
) -> RowsPerPageResponse:
    """Get the platform-wide rows per page setting."""
    value = admin_settings_service.get_setting_value(db, "rows_per_page", default="20")
    return RowsPerPageResponse(rows_per_page=int(value))


@router.put("/display/rows-per-page", response_model=RowsPerPageUpdateResponse)
def set_rows_per_page(
    rows: int = Query(..., ge=10, le=100, description="Rows per page (10-100)"),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
) -> RowsPerPageUpdateResponse:
    """
    Set the platform-wide rows per page setting.

    Valid values: 10, 20, 50, 100
    """
    valid_values = [10, 20, 50, 100]
    if rows not in valid_values:
        # Round to nearest valid value
        rows = min(valid_values, key=lambda x: abs(x - rows))

    setting_data = AdminSettingCreate(
        key="rows_per_page",
        value=str(rows),
        value_type="integer",
        category="display",
        description="Default number of rows per page in admin tables",
        is_public=True,
    )

    admin_settings_service.upsert_setting(
        db=db, setting_data=setting_data, admin_user_id=current_admin.id
    )

    admin_audit_service.log_action(
        db=db,
        admin_user_id=current_admin.id,
        action="update_setting",
        target_type="setting",
        target_id="rows_per_page",
        details={"value": rows},
    )
    db.commit()

    return RowsPerPageUpdateResponse(
        rows_per_page=rows, message="Rows per page setting updated"
    )


@router.get("/display/public", response_model=PublicDisplaySettingsResponse)
def get_public_display_settings(
    db: Session = Depends(get_db),
) -> PublicDisplaySettingsResponse:
    """
    Get public display settings (no auth required).

    Returns settings that can be used by frontend without admin auth.
    """
    rows_per_page = admin_settings_service.get_setting_value(
        db, "rows_per_page", default="20"
    )

    return PublicDisplaySettingsResponse(rows_per_page=int(rows_per_page))


@router.delete("/{key}")
def delete_setting(
    key: str,
    confirm: bool = Query(False, description="Must be true to confirm deletion"),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Delete platform setting.

    Requires confirmation parameter.
    WARNING: Deleting settings may affect platform functionality.
    """
    if not confirm:
        raise ConfirmationRequiredException(
            operation="delete_setting",
            message="Deletion requires confirmation parameter: confirm=true",
        )

    message = admin_settings_service.delete_setting(
        db=db, key=key, admin_user_id=current_admin.id
    )

    # Log action
    admin_audit_service.log_action(
        db=db,
        admin_user_id=current_admin.id,
        action="delete_setting",
        target_type="setting",
        target_id=key,
        details={},
    )
    db.commit()

    return {"message": message}