# app/api/v1/admin/admin_users.py
"""
Admin user management endpoints (Super Admin only).

This module provides endpoints for:
- Listing all admin users with their platform assignments
- Creating platform admins
- Assigning/removing platform access
- Promoting/demoting super admin status
"""

import logging
from typing import Optional

from fastapi import APIRouter, Body, Depends, Path, Query
from pydantic import BaseModel, EmailStr
from sqlalchemy.orm import Session

from app.api.deps import get_current_super_admin, get_current_super_admin_api
from app.core.database import get_db
from app.services.admin_platform_service import admin_platform_service
from models.database.user import User

router = APIRouter(prefix="/admin-users")
logger = logging.getLogger(__name__)


# ============================================================================
# SCHEMAS
# ============================================================================


class PlatformAssignmentResponse(BaseModel):
    """Response for a platform assignment."""

    platform_id: int
    platform_code: str
    platform_name: str
    is_active: bool

    class Config:
        from_attributes = True


class AdminUserResponse(BaseModel):
    """Response for an admin user."""

    id: int
    email: str
    username: str
    first_name: Optional[str] = None
    last_name: Optional[str] = None
    is_active: bool
    is_super_admin: bool
    platform_assignments: list[PlatformAssignmentResponse] = []

    class Config:
        from_attributes = True


class AdminUserListResponse(BaseModel):
    """Response for listing admin users."""

    admins: list[AdminUserResponse]
    total: int


class CreatePlatformAdminRequest(BaseModel):
    """Request to create a new platform admin."""

    email: EmailStr
    username: str
    password: str
    first_name: Optional[str] = None
    last_name: Optional[str] = None
    platform_ids: list[int]


class AssignPlatformRequest(BaseModel):
    """Request to assign admin to platform."""

    platform_id: int


class ToggleSuperAdminRequest(BaseModel):
    """Request to toggle super admin status."""

    is_super_admin: bool


# ============================================================================
# ENDPOINTS
# ============================================================================


@router.get("", response_model=AdminUserListResponse)
def list_admin_users(
    skip: int = Query(0, ge=0),
    limit: int = Query(100, ge=1, le=500),
    include_super_admins: bool = Query(True),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin),
):
    """
    List all admin users with their platform assignments.

    Super admin only.
    """
    from sqlalchemy.orm import joinedload

    query = db.query(User).filter(User.role == "admin")

    if not include_super_admins:
        query = query.filter(User.is_super_admin == False)

    total = query.count()

    admins = (
        query.options(joinedload(User.admin_platforms))
        .offset(skip)
        .limit(limit)
        .all()
    )

    admin_responses = []
    for admin in admins:
        assignments = []
        if not admin.is_super_admin:
            for ap in admin.admin_platforms:
                if ap.is_active and ap.platform:
                    assignments.append(
                        PlatformAssignmentResponse(
                            platform_id=ap.platform_id,
                            platform_code=ap.platform.code,
                            platform_name=ap.platform.name,
                            is_active=ap.is_active,
                        )
                    )

        admin_responses.append(
            AdminUserResponse(
                id=admin.id,
                email=admin.email,
                username=admin.username,
                first_name=admin.first_name,
                last_name=admin.last_name,
                is_active=admin.is_active,
                is_super_admin=admin.is_super_admin,
                platform_assignments=assignments,
            )
        )

    return AdminUserListResponse(admins=admin_responses, total=total)


@router.post("", response_model=AdminUserResponse)
def create_platform_admin(
    request: CreatePlatformAdminRequest,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin_api),
):
    """
    Create a new platform admin with platform assignments.

    Super admin only.
    """
    user, assignments = admin_platform_service.create_platform_admin(
        db=db,
        email=request.email,
        username=request.username,
        password=request.password,
        platform_ids=request.platform_ids,
        created_by_user_id=current_admin.id,
        first_name=request.first_name,
        last_name=request.last_name,
    )

    db.commit()

    # Refresh to get relationships
    db.refresh(user)

    assignment_responses = [
        PlatformAssignmentResponse(
            platform_id=ap.platform_id,
            platform_code=ap.platform.code if ap.platform else "",
            platform_name=ap.platform.name if ap.platform else "",
            is_active=ap.is_active,
        )
        for ap in user.admin_platforms
        if ap.is_active
    ]

    logger.info(f"Created platform admin {user.username} by {current_admin.username}")

    return AdminUserResponse(
        id=user.id,
        email=user.email,
        username=user.username,
        first_name=user.first_name,
        last_name=user.last_name,
        is_active=user.is_active,
        is_super_admin=user.is_super_admin,
        platform_assignments=assignment_responses,
    )


@router.get("/{user_id}", response_model=AdminUserResponse)
def get_admin_user(
    user_id: int = Path(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin),
):
    """
    Get admin user details with platform assignments.

    Super admin only.
    """
    from sqlalchemy.orm import joinedload

    from app.exceptions import ValidationException

    admin = (
        db.query(User)
        .options(joinedload(User.admin_platforms))
        .filter(User.id == user_id, User.role == "admin")
        .first()
    )

    if not admin:
        raise ValidationException("Admin user not found", field="user_id")

    assignments = []
    if not admin.is_super_admin:
        for ap in admin.admin_platforms:
            if ap.is_active and ap.platform:
                assignments.append(
                    PlatformAssignmentResponse(
                        platform_id=ap.platform_id,
                        platform_code=ap.platform.code,
                        platform_name=ap.platform.name,
                        is_active=ap.is_active,
                    )
                )

    return AdminUserResponse(
        id=admin.id,
        email=admin.email,
        username=admin.username,
        first_name=admin.first_name,
        last_name=admin.last_name,
        is_active=admin.is_active,
        is_super_admin=admin.is_super_admin,
        platform_assignments=assignments,
    )


@router.post("/{user_id}/platforms/{platform_id}")
def assign_admin_to_platform(
    user_id: int = Path(...),
    platform_id: int = Path(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin_api),
):
    """
    Assign an admin to a platform.

    Super admin only.
    """
    assignment = admin_platform_service.assign_admin_to_platform(
        db=db,
        admin_user_id=user_id,
        platform_id=platform_id,
        assigned_by_user_id=current_admin.id,
    )
    db.commit()

    logger.info(
        f"Assigned admin {user_id} to platform {platform_id} by {current_admin.username}"
    )

    return {
        "message": "Admin assigned to platform successfully",
        "platform_id": platform_id,
        "user_id": user_id,
    }


@router.delete("/{user_id}/platforms/{platform_id}")
def remove_admin_from_platform(
    user_id: int = Path(...),
    platform_id: int = Path(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin_api),
):
    """
    Remove an admin's access to a platform.

    Super admin only.
    """
    admin_platform_service.remove_admin_from_platform(
        db=db,
        admin_user_id=user_id,
        platform_id=platform_id,
        removed_by_user_id=current_admin.id,
    )
    db.commit()

    logger.info(
        f"Removed admin {user_id} from platform {platform_id} by {current_admin.username}"
    )

    return {
        "message": "Admin removed from platform successfully",
        "platform_id": platform_id,
        "user_id": user_id,
    }


@router.put("/{user_id}/super-admin")
def toggle_super_admin_status(
    user_id: int = Path(...),
    request: ToggleSuperAdminRequest = Body(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin_api),
):
    """
    Promote or demote an admin to/from super admin.

    Super admin only.
    """
    user = admin_platform_service.toggle_super_admin(
        db=db,
        user_id=user_id,
        is_super_admin=request.is_super_admin,
        current_admin_id=current_admin.id,
    )
    db.commit()

    action = "promoted to" if request.is_super_admin else "demoted from"
    logger.info(f"Admin {user.username} {action} super admin by {current_admin.username}")

    return {
        "message": f"Admin {action} super admin successfully",
        "user_id": user_id,
        "is_super_admin": user.is_super_admin,
    }


@router.get("/{user_id}/platforms")
def get_admin_platforms(
    user_id: int = Path(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_super_admin),
):
    """
    Get all platforms assigned to an admin.

    Super admin only.
    """
    platforms = admin_platform_service.get_platforms_for_admin(db, user_id)

    return {
        "platforms": [
            {
                "id": p.id,
                "code": p.code,
                "name": p.name,
            }
            for p in platforms
        ],
        "user_id": user_id,
    }