package handlers

import (
	"aggios-app/backend/internal/api/middleware"
	"aggios-app/backend/internal/domain"
	"aggios-app/backend/internal/repository"
	"encoding/json"
	"log"
	"net/http"
	"time"

	"github.com/google/uuid"
	"github.com/gorilla/mux"
)

type ERPHandler struct {
	repo *repository.ERPRepository
}

func NewERPHandler(repo *repository.ERPRepository) *ERPHandler {
	return &ERPHandler{repo: repo}
}

// ==================== FINANCE ====================

func (h *ERPHandler) CreateFinancialCategory(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	var cat domain.FinancialCategory
	if err := json.NewDecoder(r.Body).Decode(&cat); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	cat.ID = uuid.New()
	cat.TenantID, _ = uuid.Parse(tenantID)
	cat.IsActive = true

	if err := h.repo.CreateFinancialCategory(&cat); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(cat)
}

func (h *ERPHandler) GetFinancialCategories(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	cats, err := h.repo.GetFinancialCategoriesByTenant(tenantID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(cats)
}

func (h *ERPHandler) CreateBankAccount(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	var acc domain.BankAccount
	if err := json.NewDecoder(r.Body).Decode(&acc); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	acc.ID = uuid.New()
	acc.TenantID, _ = uuid.Parse(tenantID)
	acc.IsActive = true

	if err := h.repo.CreateBankAccount(&acc); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(acc)
}

func (h *ERPHandler) GetBankAccounts(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	accs, err := h.repo.GetBankAccountsByTenant(tenantID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(accs)
}

func (h *ERPHandler) CreateTransaction(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	userID, _ := r.Context().Value(middleware.UserIDKey).(string)
	var t domain.FinancialTransaction
	if err := json.NewDecoder(r.Body).Decode(&t); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	t.ID = uuid.New()
	t.TenantID, _ = uuid.Parse(tenantID)
	t.CreatedBy, _ = uuid.Parse(userID)

	if err := h.repo.CreateTransaction(&t); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(t)
}

func (h *ERPHandler) GetTransactions(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	txs, err := h.repo.GetTransactionsByTenant(tenantID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(txs)
}

// ==================== PRODUCTS ====================

func (h *ERPHandler) CreateProduct(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	var p domain.Product
	if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	p.ID = uuid.New()
	p.TenantID, _ = uuid.Parse(tenantID)
	p.IsActive = true

	if err := h.repo.CreateProduct(&p); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(p)
}

func (h *ERPHandler) GetProducts(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	products, err := h.repo.GetProductsByTenant(tenantID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(products)
}

// ==================== ORDERS ====================

type createOrderRequest struct {
	Order domain.Order       `json:"order"`
	Items []domain.OrderItem `json:"items"`
}

func (h *ERPHandler) CreateOrder(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	userID, _ := r.Context().Value(middleware.UserIDKey).(string)
	var req createOrderRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	req.Order.ID = uuid.New()
	req.Order.TenantID, _ = uuid.Parse(tenantID)
	req.Order.CreatedBy, _ = uuid.Parse(userID)
	if req.Order.Status == "" {
		req.Order.Status = "draft"
	}

	for i := range req.Items {
		req.Items[i].ID = uuid.New()
		req.Items[i].OrderID = req.Order.ID
		req.Items[i].CreatedAt = time.Now()
	}

	if err := h.repo.CreateOrder(&req.Order, req.Items); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(req.Order)
}

func (h *ERPHandler) GetOrders(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	orders, err := h.repo.GetOrdersByTenant(tenantID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(orders)
}

// ==================== ENTITIES ====================

func (h *ERPHandler) CreateEntity(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	var e domain.Entity
	if err := json.NewDecoder(r.Body).Decode(&e); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	e.ID = uuid.New()
	e.TenantID, _ = uuid.Parse(tenantID)
	if e.Status == "" {
		e.Status = "active"
	}

	if err := h.repo.CreateEntity(&e); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(e)
}

func (h *ERPHandler) GetEntities(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	entityType := r.URL.Query().Get("type") // customer or supplier

	entities, err := h.repo.GetEntitiesByTenant(tenantID, entityType)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(entities)
}
func (h *ERPHandler) UpdateTransaction(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	id, err := uuid.Parse(idStr)
	if err != nil {
		http.Error(w, "invalid id", http.StatusBadRequest)
		return
	}

	var t domain.FinancialTransaction
	if err := json.NewDecoder(r.Body).Decode(&t); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	t.ID = id
	t.TenantID, _ = uuid.Parse(tenantID)

	if err := h.repo.UpdateTransaction(&t); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) DeleteTransaction(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	if err := h.repo.DeleteTransaction(idStr, tenantID); err != nil {
		log.Printf("❌ Error deleting transaction: %v", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) UpdateEntity(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	id, err := uuid.Parse(idStr)
	if err != nil {
		http.Error(w, "invalid id", http.StatusBadRequest)
		return
	}

	var e domain.Entity
	if err := json.NewDecoder(r.Body).Decode(&e); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	e.ID = id
	e.TenantID, _ = uuid.Parse(tenantID)

	if err := h.repo.UpdateEntity(&e); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) DeleteEntity(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	if err := h.repo.DeleteEntity(idStr, tenantID); err != nil {
		log.Printf("❌ Error deleting entity: %v", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) UpdateProduct(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	id, err := uuid.Parse(idStr)
	if err != nil {
		http.Error(w, "invalid id", http.StatusBadRequest)
		return
	}

	var p domain.Product
	if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	p.ID = id
	p.TenantID, _ = uuid.Parse(tenantID)

	if err := h.repo.UpdateProduct(&p); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) DeleteProduct(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	if err := h.repo.DeleteProduct(idStr, tenantID); err != nil {
		log.Printf("❌ Error deleting product: %v", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) UpdateBankAccount(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	id, err := uuid.Parse(idStr)
	if err != nil {
		http.Error(w, "invalid id", http.StatusBadRequest)
		return
	}

	var a domain.BankAccount
	if err := json.NewDecoder(r.Body).Decode(&a); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	a.ID = id
	a.TenantID, _ = uuid.Parse(tenantID)

	if err := h.repo.UpdateBankAccount(&a); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) DeleteBankAccount(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	if err := h.repo.DeleteBankAccount(idStr, tenantID); err != nil {
		log.Printf("❌ Error deleting bank account: %v", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}

func (h *ERPHandler) DeleteOrder(w http.ResponseWriter, r *http.Request) {
	tenantID, _ := r.Context().Value(middleware.TenantIDKey).(string)
	idStr := mux.Vars(r)["id"]
	if err := h.repo.DeleteOrder(idStr, tenantID); err != nil {
		log.Printf("❌ Error deleting order: %v", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusOK)
}