# app/api/v1/admin/companies.py
"""
Company management endpoints for admin.
"""

import logging
from datetime import UTC, datetime

from fastapi import APIRouter, Body, Depends, Path, 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 CompanyHasVendorsException, ConfirmationRequiredException
from app.services.company_service import company_service
from models.database.user import User
from models.schema.company import (
    CompanyCreate,
    CompanyCreateResponse,
    CompanyDetailResponse,
    CompanyListResponse,
    CompanyResponse,
    CompanyTransferOwnership,
    CompanyTransferOwnershipResponse,
    CompanyUpdate,
)

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


@router.post("", response_model=CompanyCreateResponse)
def create_company_with_owner(
    company_data: CompanyCreate,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Create a new company with owner user account (Admin only).

    This endpoint:
    1. Creates a new company record
    2. Creates an owner user account with owner_email (if not exists)
    3. Returns credentials (temporary password shown ONCE if new user created)

    **Email Fields:**
    - `owner_email`: Used for owner's login/authentication (stored in users.email)
    - `contact_email`: Public business contact (stored in companies.contact_email)

    Returns company details with owner credentials.
    """
    company, owner_user, temp_password = company_service.create_company_with_owner(
        db, company_data
    )

    db.commit()  # ✅ ARCH: Commit at API level for transaction control

    return CompanyCreateResponse(
        company=CompanyResponse(
            id=company.id,
            name=company.name,
            description=company.description,
            owner_user_id=company.owner_user_id,
            contact_email=company.contact_email,
            contact_phone=company.contact_phone,
            website=company.website,
            business_address=company.business_address,
            tax_number=company.tax_number,
            is_active=company.is_active,
            is_verified=company.is_verified,
            created_at=company.created_at.isoformat(),
            updated_at=company.updated_at.isoformat(),
        ),
        owner_user_id=owner_user.id,
        owner_username=owner_user.username,
        owner_email=owner_user.email,
        temporary_password=temp_password or "N/A (Existing user)",
        login_url="http://localhost:8000/admin/login",
    )


@router.get("", response_model=CompanyListResponse)
def get_all_companies(
    skip: int = Query(0, ge=0),
    limit: int = Query(100, ge=1, le=1000),
    search: str | None = Query(None, description="Search by company name"),
    is_active: bool | None = Query(None),
    is_verified: bool | None = Query(None),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """Get all companies with filtering (Admin only)."""
    companies, total = company_service.get_companies(
        db,
        skip=skip,
        limit=limit,
        search=search,
        is_active=is_active,
        is_verified=is_verified,
    )

    return CompanyListResponse(
        companies=[
            CompanyResponse(
                id=c.id,
                name=c.name,
                description=c.description,
                owner_user_id=c.owner_user_id,
                contact_email=c.contact_email,
                contact_phone=c.contact_phone,
                website=c.website,
                business_address=c.business_address,
                tax_number=c.tax_number,
                is_active=c.is_active,
                is_verified=c.is_verified,
                created_at=c.created_at.isoformat(),
                updated_at=c.updated_at.isoformat(),
            )
            for c in companies
        ],
        total=total,
        skip=skip,
        limit=limit,
    )


@router.get("/{company_id}", response_model=CompanyDetailResponse)
def get_company_details(
    company_id: int = Path(..., description="Company ID"),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Get detailed company information including vendor counts (Admin only).
    """
    company = company_service.get_company_by_id(db, company_id)

    # Count vendors
    vendor_count = len(company.vendors)
    active_vendor_count = sum(1 for v in company.vendors if v.is_active)

    # Build vendors list for detail view
    vendors_list = [
        {
            "id": v.id,
            "vendor_code": v.vendor_code,
            "name": v.name,
            "subdomain": v.subdomain,
            "is_active": v.is_active,
            "is_verified": v.is_verified,
        }
        for v in company.vendors
    ]

    return CompanyDetailResponse(
        id=company.id,
        name=company.name,
        description=company.description,
        owner_user_id=company.owner_user_id,
        owner_email=company.owner.email if company.owner else None,
        owner_username=company.owner.username if company.owner else None,
        contact_email=company.contact_email,
        contact_phone=company.contact_phone,
        website=company.website,
        business_address=company.business_address,
        tax_number=company.tax_number,
        is_active=company.is_active,
        is_verified=company.is_verified,
        created_at=company.created_at.isoformat(),
        updated_at=company.updated_at.isoformat(),
        vendor_count=vendor_count,
        active_vendor_count=active_vendor_count,
        vendors=vendors_list,
    )


@router.put("/{company_id}", response_model=CompanyResponse)
def update_company(
    company_id: int = Path(..., description="Company ID"),
    company_update: CompanyUpdate = Body(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Update company information (Admin only).

    **Can update:**
    - Basic info: name, description
    - Business contact: contact_email, contact_phone, website
    - Business details: business_address, tax_number
    - Status: is_active, is_verified

    **Cannot update:**
    - `owner_user_id` (would require ownership transfer feature)
    """
    company = company_service.update_company(db, company_id, company_update)
    db.commit()  # ✅ ARCH: Commit at API level for transaction control

    return CompanyResponse(
        id=company.id,
        name=company.name,
        description=company.description,
        owner_user_id=company.owner_user_id,
        contact_email=company.contact_email,
        contact_phone=company.contact_phone,
        website=company.website,
        business_address=company.business_address,
        tax_number=company.tax_number,
        is_active=company.is_active,
        is_verified=company.is_verified,
        created_at=company.created_at.isoformat(),
        updated_at=company.updated_at.isoformat(),
    )


@router.put("/{company_id}/verification", response_model=CompanyResponse)
def toggle_company_verification(
    company_id: int = Path(..., description="Company ID"),
    verification_data: dict = Body(..., example={"is_verified": True}),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Toggle company verification status (Admin only).

    Request body: { "is_verified": true/false }
    """
    is_verified = verification_data.get("is_verified", False)
    company = company_service.toggle_verification(db, company_id, is_verified)
    db.commit()  # ✅ ARCH: Commit at API level for transaction control

    return CompanyResponse(
        id=company.id,
        name=company.name,
        description=company.description,
        owner_user_id=company.owner_user_id,
        contact_email=company.contact_email,
        contact_phone=company.contact_phone,
        website=company.website,
        business_address=company.business_address,
        tax_number=company.tax_number,
        is_active=company.is_active,
        is_verified=company.is_verified,
        created_at=company.created_at.isoformat(),
        updated_at=company.updated_at.isoformat(),
    )


@router.put("/{company_id}/status", response_model=CompanyResponse)
def toggle_company_status(
    company_id: int = Path(..., description="Company ID"),
    status_data: dict = Body(..., example={"is_active": True}),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Toggle company active status (Admin only).

    Request body: { "is_active": true/false }
    """
    is_active = status_data.get("is_active", True)
    company = company_service.toggle_active(db, company_id, is_active)
    db.commit()  # ✅ ARCH: Commit at API level for transaction control

    return CompanyResponse(
        id=company.id,
        name=company.name,
        description=company.description,
        owner_user_id=company.owner_user_id,
        contact_email=company.contact_email,
        contact_phone=company.contact_phone,
        website=company.website,
        business_address=company.business_address,
        tax_number=company.tax_number,
        is_active=company.is_active,
        is_verified=company.is_verified,
        created_at=company.created_at.isoformat(),
        updated_at=company.updated_at.isoformat(),
    )


@router.post(
    "/{company_id}/transfer-ownership",
    response_model=CompanyTransferOwnershipResponse,
)
def transfer_company_ownership(
    company_id: int = Path(..., description="Company ID"),
    transfer_data: CompanyTransferOwnership = Body(...),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Transfer company ownership to another user (Admin only).

    **This is a critical operation that:**
    - Changes the company's owner_user_id
    - Updates all associated vendors' owner_user_id
    - Creates audit trail

    ⚠️ **This action is logged and should be used carefully.**

    **Requires:**
    - `new_owner_user_id`: ID of user who will become owner
    - `confirm_transfer`: Must be true
    - `transfer_reason`: Optional reason for audit trail
    """
    company, old_owner, new_owner = company_service.transfer_ownership(
        db, company_id, transfer_data
    )
    db.commit()  # ✅ ARCH: Commit at API level for transaction control

    return CompanyTransferOwnershipResponse(
        message="Ownership transferred successfully",
        company_id=company.id,
        company_name=company.name,
        old_owner={
            "id": old_owner.id,
            "username": old_owner.username,
            "email": old_owner.email,
        },
        new_owner={
            "id": new_owner.id,
            "username": new_owner.username,
            "email": new_owner.email,
        },
        transferred_at=datetime.now(UTC),
        transfer_reason=transfer_data.transfer_reason,
    )


@router.delete("/{company_id}")
def delete_company(
    company_id: int = Path(..., description="Company ID"),
    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 company and all associated vendors (Admin only).

    ⚠️ **WARNING: This is destructive and will delete:**
    - Company account
    - All vendors under this company
    - All products under those vendors
    - All orders, customers, team members

    Requires confirmation parameter: `confirm=true`
    """
    if not confirm:
        raise ConfirmationRequiredException(
            operation="delete_company",
            message="Deletion requires confirmation parameter: confirm=true",
        )

    # Get company to check vendor count
    company = company_service.get_company_by_id(db, company_id)
    vendor_count = len(company.vendors)

    if vendor_count > 0:
        raise CompanyHasVendorsException(company_id, vendor_count)

    company_service.delete_company(db, company_id)
    db.commit()  # ✅ ARCH: Commit at API level for transaction control

    return {"message": f"Company {company_id} deleted successfully"}