package handlers

import (
	"log"
	"net/http"
	"strconv"

	"code.springupsoftware.com/cmc/cmc-sales/internal/cmc/db"
	"code.springupsoftware.com/cmc/cmc-sales/internal/cmc/templates"
	"github.com/gorilla/mux"
)

type PageHandler struct {
	queries *db.Queries
	tmpl    *templates.TemplateManager
}

func NewPageHandler(queries *db.Queries, tmpl *templates.TemplateManager) *PageHandler {
	return &PageHandler{
		queries: queries,
		tmpl:    tmpl,
	}
}

// Home page
func (h *PageHandler) Home(w http.ResponseWriter, r *http.Request) {
	data := map[string]interface{}{
		"Title": "Dashboard",
	}

	if err := h.tmpl.Render(w, "index.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

// Customer pages
func (h *PageHandler) CustomersIndex(w http.ResponseWriter, r *http.Request) {
	page := 1
	if p := r.URL.Query().Get("page"); p != "" {
		if val, err := strconv.Atoi(p); err == nil && val > 0 {
			page = val
		}
	}

	limit := 20
	offset := (page - 1) * limit

	customers, err := h.queries.ListCustomers(r.Context(), db.ListCustomersParams{
		Limit:  int32(limit + 1), // Get one extra to check if there are more
		Offset: int32(offset),
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	hasMore := len(customers) > limit
	if hasMore {
		customers = customers[:limit]
	}

	data := map[string]interface{}{
		"Customers": customers,
		"Page":      page,
		"PrevPage":  page - 1,
		"NextPage":  page + 1,
		"HasMore":   hasMore,
	}

	// Check if this is an HTMX request
	if r.Header.Get("HX-Request") == "true" {
		if err := h.tmpl.Render(w, "customers/table.html", data); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
		return
	}

	if err := h.tmpl.Render(w, "customers/index.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) CustomersNew(w http.ResponseWriter, r *http.Request) {
	data := map[string]interface{}{
		"Customer": db.Customer{},
	}

	if err := h.tmpl.Render(w, "customers/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) CustomersEdit(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid customer ID", http.StatusBadRequest)
		return
	}

	customer, err := h.queries.GetCustomer(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Customer not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"Customer": customer,
	}

	if err := h.tmpl.Render(w, "customers/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) CustomersShow(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid customer ID", http.StatusBadRequest)
		return
	}

	customer, err := h.queries.GetCustomer(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Customer not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"Customer": customer,
	}

	if err := h.tmpl.Render(w, "customers/show.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) CustomersSearch(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query().Get("search")
	page := 1
	if p := r.URL.Query().Get("page"); p != "" {
		if val, err := strconv.Atoi(p); err == nil && val > 0 {
			page = val
		}
	}

	limit := 20
	offset := (page - 1) * limit

	var customers []db.Customer
	var err error

	if query == "" {
		customers, err = h.queries.ListCustomers(r.Context(), db.ListCustomersParams{
			Limit:  int32(limit + 1),
			Offset: int32(offset),
		})
	} else {
		customers, err = h.queries.SearchCustomersByName(r.Context(), db.SearchCustomersByNameParams{
			CONCAT:   query,
			CONCAT_2: query,
			Limit:    int32(limit + 1),
			Offset:   int32(offset),
		})
	}

	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	hasMore := len(customers) > limit
	if hasMore {
		customers = customers[:limit]
	}

	data := map[string]interface{}{
		"Customers": customers,
		"Page":      page,
		"PrevPage":  page - 1,
		"NextPage":  page + 1,
		"HasMore":   hasMore,
	}

	w.Header().Set("Content-Type", "text/html")
	if err := h.tmpl.Render(w, "customers/table.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

// Product page handlers
func (h *PageHandler) ProductsIndex(w http.ResponseWriter, r *http.Request) {
	// Similar implementation to CustomersIndex but for products
	data := map[string]interface{}{
		"Products": []db.Product{}, // Placeholder
	}

	if err := h.tmpl.Render(w, "products/index.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) ProductsNew(w http.ResponseWriter, r *http.Request) {
	data := map[string]interface{}{
		"Product": db.Product{},
	}

	if err := h.tmpl.Render(w, "products/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) ProductsShow(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid product ID", http.StatusBadRequest)
		return
	}

	product, err := h.queries.GetProduct(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Product not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"Product": product,
	}

	if err := h.tmpl.Render(w, "products/show.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) ProductsEdit(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid product ID", http.StatusBadRequest)
		return
	}

	product, err := h.queries.GetProduct(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Product not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"Product": product,
	}

	if err := h.tmpl.Render(w, "products/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) ProductsSearch(w http.ResponseWriter, r *http.Request) {
	// Similar to CustomersSearch but for products
	data := map[string]interface{}{
		"Products": []db.Product{},
	}

	w.Header().Set("Content-Type", "text/html")
	if err := h.tmpl.Render(w, "products/table.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

// Purchase Order page handlers
func (h *PageHandler) PurchaseOrdersIndex(w http.ResponseWriter, r *http.Request) {
	data := map[string]interface{}{
		"PurchaseOrders": []db.PurchaseOrder{},
	}

	if err := h.tmpl.Render(w, "purchase-orders/index.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) PurchaseOrdersNew(w http.ResponseWriter, r *http.Request) {
	data := map[string]interface{}{
		"PurchaseOrder": db.PurchaseOrder{},
	}

	if err := h.tmpl.Render(w, "purchase-orders/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) PurchaseOrdersShow(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid purchase order ID", http.StatusBadRequest)
		return
	}

	purchaseOrder, err := h.queries.GetPurchaseOrder(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Purchase order not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"PurchaseOrder": purchaseOrder,
	}

	if err := h.tmpl.Render(w, "purchase-orders/show.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) PurchaseOrdersEdit(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid purchase order ID", http.StatusBadRequest)
		return
	}

	purchaseOrder, err := h.queries.GetPurchaseOrder(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Purchase order not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"PurchaseOrder": purchaseOrder,
	}

	if err := h.tmpl.Render(w, "purchase-orders/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) PurchaseOrdersSearch(w http.ResponseWriter, r *http.Request) {
	data := map[string]interface{}{
		"PurchaseOrders": []db.PurchaseOrder{},
	}

	w.Header().Set("Content-Type", "text/html")
	if err := h.tmpl.Render(w, "purchase-orders/table.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

// Enquiry page handlers
func (h *PageHandler) EnquiriesIndex(w http.ResponseWriter, r *http.Request) {
	page := 1
	if p := r.URL.Query().Get("page"); p != "" {
		if val, err := strconv.Atoi(p); err == nil && val > 0 {
			page = val
		}
	}

	limit := 150
	offset := (page - 1) * limit

	var enquiries interface{}
	var err error
	var hasMore bool

	// Check if we want archived enquiries
	if r.URL.Query().Get("archived") == "true" {
		archivedEnquiries, err := h.queries.ListArchivedEnquiries(r.Context(), db.ListArchivedEnquiriesParams{
			Limit:  int32(limit + 1),
			Offset: int32(offset),
		})
		if err == nil {
			hasMore = len(archivedEnquiries) > limit
			if hasMore {
				archivedEnquiries = archivedEnquiries[:limit]
			}
			enquiries = archivedEnquiries
		}
	} else {
		activeEnquiries, err := h.queries.ListEnquiries(r.Context(), db.ListEnquiriesParams{
			Limit:  int32(limit + 1),
			Offset: int32(offset),
		})
		if err == nil {
			hasMore = len(activeEnquiries) > limit
			if hasMore {
				activeEnquiries = activeEnquiries[:limit]
			}
			enquiries = activeEnquiries
		}
	}

	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	// Get status list for dropdown and CSS classes
	statuses, err := h.queries.GetAllStatuses(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	data := map[string]interface{}{
		"Enquiries": enquiries,
		"Statuses":  statuses,
		"Page":      page,
		"PrevPage":  page - 1,
		"NextPage":  page + 1,
		"HasMore":   hasMore,
	}

	// Check if this is an HTMX request
	if r.Header.Get("HX-Request") == "true" {
		if err := h.tmpl.RenderPartial(w, "enquiries/table.html", "enquiry-table", data); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
		return
	}

	if err := h.tmpl.Render(w, "enquiries/index.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) EnquiriesNew(w http.ResponseWriter, r *http.Request) {
	// Get required form data
	statuses, err := h.queries.GetAllStatuses(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	principles, err := h.queries.GetAllPrinciples(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	states, err := h.queries.GetAllStates(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	countries, err := h.queries.GetAllCountries(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	data := map[string]interface{}{
		"Enquiry":    db.Enquiry{},
		"Statuses":   statuses,
		"Principles": principles,
		"States":     states,
		"Countries":  countries,
	}

	if err := h.tmpl.Render(w, "enquiries/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) EnquiriesShow(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid enquiry ID", http.StatusBadRequest)
		return
	}

	enquiry, err := h.queries.GetEnquiry(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Enquiry not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"Enquiry": enquiry,
	}

	if err := h.tmpl.Render(w, "enquiries/show.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) EnquiriesEdit(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid enquiry ID", http.StatusBadRequest)
		return
	}

	enquiry, err := h.queries.GetEnquiry(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Enquiry not found", http.StatusNotFound)
		return
	}

	// Get required form data
	statuses, err := h.queries.GetAllStatuses(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	principles, err := h.queries.GetAllPrinciples(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	states, err := h.queries.GetAllStates(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	countries, err := h.queries.GetAllCountries(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	data := map[string]interface{}{
		"Enquiry":    enquiry,
		"Statuses":   statuses,
		"Principles": principles,
		"States":     states,
		"Countries":  countries,
	}

	if err := h.tmpl.Render(w, "enquiries/form.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) EnquiriesSearch(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query().Get("search")
	page := 1
	if p := r.URL.Query().Get("page"); p != "" {
		if val, err := strconv.Atoi(p); err == nil && val > 0 {
			page = val
		}
	}

	limit := 150
	offset := (page - 1) * limit

	var enquiries interface{}
	var hasMore bool

	if query == "" {
		// If no search query, return regular list
		regularEnquiries, err := h.queries.ListEnquiries(r.Context(), db.ListEnquiriesParams{
			Limit:  int32(limit + 1),
			Offset: int32(offset),
		})
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		hasMore = len(regularEnquiries) > limit
		if hasMore {
			regularEnquiries = regularEnquiries[:limit]
		}
		enquiries = regularEnquiries
	} else {
		searchResults, err := h.queries.SearchEnquiries(r.Context(), db.SearchEnquiriesParams{
			CONCAT:   query,
			CONCAT_2: query,
			CONCAT_3: query,
			Limit:    int32(limit + 1),
			Offset:   int32(offset),
		})
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		hasMore = len(searchResults) > limit
		if hasMore {
			searchResults = searchResults[:limit]
		}
		enquiries = searchResults
	}

	data := map[string]interface{}{
		"Enquiries": enquiries,
		"Page":      page,
		"PrevPage":  page - 1,
		"NextPage":  page + 1,
		"HasMore":   hasMore,
	}

	w.Header().Set("Content-Type", "text/html")
	if err := h.tmpl.RenderPartial(w, "enquiries/table.html", "enquiry-table", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

// Document page handlers
func (h *PageHandler) DocumentsIndex(w http.ResponseWriter, r *http.Request) {
	page := 1
	if p := r.URL.Query().Get("page"); p != "" {
		if val, err := strconv.Atoi(p); err == nil && val > 0 {
			page = val
		}
	}

	// Get document type filter
	docType := r.URL.Query().Get("type")

	limit := 20
	offset := (page - 1) * limit

	var documents interface{}
	var err error

	if docType != "" {
		documents, err = h.queries.ListDocumentsByType(r.Context(), db.ListDocumentsByTypeParams{
			Type:   db.DocumentsType(docType),
			Limit:  int32(limit + 1),
			Offset: int32(offset),
		})
	} else {
		documents, err = h.queries.ListDocuments(r.Context(), db.ListDocumentsParams{
			Limit:  int32(limit + 1),
			Offset: int32(offset),
		})
	}

	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	// Get users list for display names (if needed)
	users, err := h.queries.GetAllUsers(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	data := map[string]interface{}{
		"Documents": documents,
		"Users":     users,
		"Page":      page,
		"DocType":   docType,
	}

	// Check if this is an HTMX request
	if r.Header.Get("HX-Request") == "true" {
		if err := h.tmpl.RenderPartial(w, "documents/table.html", "document-table", data); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
		return
	}

	if err := h.tmpl.Render(w, "documents/index.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) DocumentsShow(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid document ID", http.StatusBadRequest)
		return
	}

	document, err := h.queries.GetDocumentWithUser(r.Context(), int32(id))
	if err != nil {
		log.Printf("Error fetching document %d: %v", id, err)
		http.Error(w, "Document not found", http.StatusNotFound)
		return
	}

	data := map[string]interface{}{
		"Document": document,
	}

	if err := h.tmpl.Render(w, "documents/show.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) DocumentsSearch(w http.ResponseWriter, r *http.Request) {
	// query := r.URL.Query().Get("search") // TODO: Use when search is implemented

	var documents interface{}
	var err error

	// For now, just return all documents until search is implemented
	limit := 20
	offset := 0
	
	documents, err = h.queries.ListDocuments(r.Context(), db.ListDocumentsParams{
		Limit:  int32(limit),
		Offset: int32(offset),
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	data := map[string]interface{}{
		"Documents": documents,
	}

	w.Header().Set("Content-Type", "text/html")
	if err := h.tmpl.RenderPartial(w, "documents/table.html", "document-table", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (h *PageHandler) DocumentsView(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid document ID", http.StatusBadRequest)
		return
	}

	document, err := h.queries.GetDocumentWithUser(r.Context(), int32(id))
	if err != nil {
		http.Error(w, "Document not found", http.StatusNotFound)
		return
	}

	// Load line items for this document
	lineItems, err := h.queries.ListLineItemsByDocument(r.Context(), int32(id))
	if err != nil {
		log.Printf("Error loading line items for document %d: %v", id, err)
		// Don't fail the entire page if line items can't be loaded
		lineItems = []db.LineItem{}
	}

	// Prepare data based on document type
	data := map[string]interface{}{
		"Document":  document,
		"DocType":   string(document.Type),
		"LineItems": lineItems,
	}

	// Add document type specific data
	switch document.Type {
	case db.DocumentsTypeQuote:
		// For quotes, we might need to load enquiry data
		if document.CmcReference != "" {
			// The CmcReference for quotes is the enquiry title
			data["EnquiryTitle"] = document.CmcReference
		}

	case db.DocumentsTypeInvoice:
		// For invoices, load job and customer data if needed
		data["ShowPaymentButton"] = true

	case db.DocumentsTypePurchaseOrder:
		// For purchase orders, load principle data if needed

	case db.DocumentsTypeOrderAck:
		// For order acknowledgements, load job data if needed

	case db.DocumentsTypePackingList:
		// For packing lists, load job data if needed
	}

	// Render the appropriate template
	if err := h.tmpl.Render(w, "documents/view.html", data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}