from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from .db_manager import (
    add_supplier_to_db,
    update_supplier_in_db,
    delete_supplier_from_db,
    get_all_suppliers_from_db,
    get_supplier_details_from_db,
    add_supplier_contact_to_db,
    update_supplier_contact_in_db,
    delete_supplier_contact_from_db,
    add_purchase_activity_to_db,
    update_purchase_activity_in_db,
    delete_purchase_activity_from_db
)

router = APIRouter(prefix="/suppliers", tags=["suppliers"])

# --- Pydantic Schemas ---
class SupplierSchema(BaseModel):
    id: Optional[int] = None
    name_kr: str
    name_en: Optional[str] = None
    business_registration_number: Optional[str] = None
    contact_number: Optional[str] = None
    address: Optional[str] = None

class SupplierContactSchema(BaseModel):
    id: Optional[int] = None
    supplier_id: int
    name: str
    email: Optional[str] = None
    phone_number: Optional[str] = None
    position: Optional[str] = None
    work_location: Optional[str] = None

class PurchaseActivitySchema(BaseModel):
    id: Optional[int] = None
    supplier_id: int
    contact_id: Optional[int] = None
    activity_date: str  # YYYY-MM-DD
    activity_type: str
    memo: Optional[str] = None

# --- Suppliers APIs ---
@router.post("/", response_model=dict)
def create_supplier(supplier: SupplierSchema):
    result = add_supplier_to_db(supplier.dict())
    if result is None:
        raise HTTPException(status_code=500, detail="Failed to create supplier")
    return {"id": result, "status": "success"}

@router.put("/{supplier_id}", response_model=dict)
def update_supplier(supplier_id: int, supplier: SupplierSchema):
    data = supplier.dict()
    data['id'] = supplier_id
    success = update_supplier_in_db(data)
    if not success:
        raise HTTPException(status_code=500, detail="Failed to update supplier")
    return {"status": "success"}

@router.delete("/{supplier_id}", response_model=dict)
def delete_supplier(supplier_id: int):
    success = delete_supplier_from_db(supplier_id)
    if not success:
        raise HTTPException(status_code=500, detail="Failed to delete supplier")
    return {"status": "success"}

@router.get("/", response_model=List[SupplierSchema])
def list_suppliers():
    return get_all_suppliers_from_db()

@router.get("/{supplier_id}", response_model=dict)
def get_supplier_details(supplier_id: int):
    details = get_supplier_details_from_db(supplier_id)
    if not details:
        raise HTTPException(status_code=404, detail="Supplier not found")
    return details

# --- Contacts APIs ---
@router.post("/contacts", response_model=dict)
def create_contact(contact: SupplierContactSchema):
    result = add_supplier_contact_to_db(contact.dict())
    if result is None:
        raise HTTPException(status_code=500, detail="Failed to create contact")
    return {"id": result, "status": "success"}

@router.put("/contacts/{contact_id}", response_model=dict)
def update_contact(contact_id: int, contact: SupplierContactSchema):
    data = contact.dict()
    data['id'] = contact_id
    success = update_supplier_contact_in_db(data)
    if not success:
        raise HTTPException(status_code=500, detail="Failed to update contact")
    return {"status": "success"}

@router.delete("/contacts/{contact_id}", response_model=dict)
def delete_contact(contact_id: int):
    success = delete_supplier_contact_from_db(contact_id)
    if not success:
        raise HTTPException(status_code=500, detail="Failed to delete contact")
    return {"status": "success"}

# --- Purchase Activities APIs ---
@router.post("/activities", response_model=dict)
def create_purchase_activity(activity: PurchaseActivitySchema):
    result = add_purchase_activity_to_db(activity.dict())
    if result is None:
        raise HTTPException(status_code=500, detail="Failed to create purchase activity")
    return {"id": result, "status": "success"}

@router.put("/activities/{activity_id}", response_model=dict)
def update_purchase_activity(activity_id: int, activity: PurchaseActivitySchema):
    data = activity.dict()
    data['id'] = activity_id
    success = update_purchase_activity_in_db(data)
    if not success:
        raise HTTPException(status_code=500, detail="Failed to update purchase activity")
    return {"status": "success"}

@router.delete("/activities/{activity_id}", response_model=dict)
def delete_purchase_activity(activity_id: int):
    success = delete_purchase_activity_from_db(activity_id)
    if not success:
        raise HTTPException(status_code=500, detail="Failed to delete purchase activity")
    return {"status": "success"}