package documents

import (
	"bytes"
	"fmt"
	"html/template"
	"log"
	"path/filepath"
	"strconv"
)

// OrderAckLineItemTemplateData represents an order ack line item for template rendering
type OrderAckLineItemTemplateData struct {
	Title          string
	Description    template.HTML
	Quantity       string
	UnitPrice      float64
	UnitPriceText  string
	Discount       float64
	TotalPrice     float64
	TotalPriceText string
	HasTextPrices  bool
}

// BuildOrderAckHTML generates the complete HTML for an order acknowledgement using templates
func (g *HTMLDocumentGenerator) BuildOrderAckHTML(data *OrderAckPDFData, totalPages int, currentPage int) string {
	// Log the CmcReference for debugging
	log.Printf("=== BuildOrderAckHTML: data.CmcReference='%s', data.OrderAcknowledgement.CmcReference='%s' ===", data.CmcReference, data.OrderAcknowledgement.CmcReference)

	orderAckNumber := data.CmcReference
	if orderAckNumber == "" {
		// Fallback to document's CMC reference if data.CmcReference is empty
		orderAckNumber = data.OrderAcknowledgement.CmcReference
	}

	// Calculate totals
	subtotal := 0.0
	lineItemsData := []OrderAckLineItemTemplateData{}

	for _, item := range data.LineItems {
		unitPrice := 0.0
		totalPrice := 0.0
		discount := 0.0
		unitPriceText := ""
		totalPriceText := ""

		// Check for text price strings first
		hasTextPrices := false
		if item.UnitPriceString.Valid && item.UnitPriceString.String != "" {
			hasTextPrices = true
			unitPriceText = item.UnitPriceString.String
		} else if item.GrossUnitPrice.Valid {
			unitPrice, _ = strconv.ParseFloat(item.GrossUnitPrice.String, 64)
		}

		if item.GrossPriceString.Valid && item.GrossPriceString.String != "" {
			hasTextPrices = true
			totalPriceText = item.GrossPriceString.String
			// Don't add text prices to subtotal
		} else if item.GrossPrice.Valid {
			totalPrice, _ = strconv.ParseFloat(item.GrossPrice.String, 64)
			subtotal += totalPrice
		}

		if item.DiscountAmountTotal.Valid {
			discount, _ = strconv.ParseFloat(item.DiscountAmountTotal.String, 64)
		}

		lineItemsData = append(lineItemsData, OrderAckLineItemTemplateData{
			Title:          item.Title,
			Description:    template.HTML(item.Description),
			Quantity:       item.Quantity,
			UnitPrice:      unitPrice,
			UnitPriceText:  unitPriceText,
			Discount:       discount,
			TotalPrice:     totalPrice,
			TotalPriceText: totalPriceText,
			HasTextPrices:  hasTextPrices || item.HasTextPrices,
		})
	}

	gstAmount := 0.0
	total := subtotal
	if data.ShowGST {
		gstAmount = subtotal * 0.1
		total = subtotal + gstAmount
	}

	// Prepare template data
	templateData := struct {
		OrderAckNumber      string
		CmcReference        string
		CompanyName         string
		EmailTo             string
		Attention           string
		IssueDateString     string
		YourReference       string
		JobTitle            string
		CustomerOrderNumber string
		BillTo              template.HTML
		ShipTo              template.HTML
		ShipVia             string
		FOB                 string
		PaymentTerms        string
		CustomerABN         string
		CurrencyCode        string
		CurrencySymbol      string
		LineItems           []OrderAckLineItemTemplateData
		Subtotal            float64
		GSTAmount           float64
		Total               float64
		ShowGST             bool
		PageCount           int
		CurrentPage         int
		FreightDetails      template.HTML
		LogoDataURI         string
	}{
		OrderAckNumber:      orderAckNumber,
		CmcReference:        data.CmcReference,
		CompanyName:         data.Customer.Name,
		EmailTo:             data.EmailTo,
		Attention:           data.Attention,
		IssueDateString:     data.IssueDateString,
		YourReference:       data.YourReference,
		JobTitle:            data.JobTitle,
		CustomerOrderNumber: data.CustomerOrderNumber,
		BillTo:              template.HTML(data.BillTo),
		ShipTo:              template.HTML(data.ShipTo),
		ShipVia:             data.ShipVia,
		FOB:                 data.FOB,
		PaymentTerms:        data.PaymentTerms,
		CustomerABN:         data.CustomerABN,
		CurrencyCode:        data.CurrencyCode,
		CurrencySymbol:      data.CurrencySymbol,
		LineItems:           lineItemsData,
		Subtotal:            subtotal,
		GSTAmount:           gstAmount,
		Total:               total,
		ShowGST:             data.ShowGST,
		PageCount:           totalPages,
		CurrentPage:         currentPage,
		FreightDetails:      template.HTML(data.FreightDetails),
		LogoDataURI:         g.loadLogo("quote_logo.png"),
	}

	// Define template functions
	funcMap := template.FuncMap{
		"formatPrice": func(price float64, textPrice string) template.HTML {
			// If a text price string is provided, use it as-is
			if textPrice != "" {
				return template.HTML(textPrice)
			}
			// Otherwise format the numeric price
			formatted := FormatPriceWithCommas(fmt.Sprintf("%.2f", price))
			return template.HTML(fmt.Sprintf("%s%s", data.CurrencySymbol, formatted))
		},
		"formatDiscount": func(discount float64, hasTextPrices bool) template.HTML {
			if hasTextPrices {
				return template.HTML("-")
			}
			// Show 0.00 when no discount, otherwise prefix with minus
			if discount <= 0 {
				return template.HTML(fmt.Sprintf("%s0.00", data.CurrencySymbol))
			}
			formatted := FormatPriceWithCommas(fmt.Sprintf("%.2f", discount))
			return template.HTML(fmt.Sprintf("-%s%s", data.CurrencySymbol, formatted))
		},
		"formatTotal": func(amount float64) template.HTML {
			formatted := FormatPriceWithCommas(fmt.Sprintf("%.2f", amount))
			return template.HTML(fmt.Sprintf("%s%s", data.CurrencySymbol, formatted))
		},
	}

	// Parse and execute template
	possiblePathSets := [][]string{
		{
			filepath.Join("internal", "cmc", "documents", "templates", "order-acknowledgement.html"),
			filepath.Join("internal", "cmc", "documents", "templates", "header.html"),
		},
		{
			filepath.Join("go", "internal", "cmc", "documents", "templates", "order-acknowledgement.html"),
			filepath.Join("go", "internal", "cmc", "documents", "templates", "header.html"),
		},
		{
			filepath.Join("templates", "pdf", "order-acknowledgement.html"),
			filepath.Join("templates", "pdf", "header.html"),
		},
		{
			"/app/templates/pdf/order-acknowledgement.html",
			"/app/templates/pdf/header.html",
		},
	}

	var tmpl *template.Template
	var err error

	for _, pathSet := range possiblePathSets {
		tmpl, err = template.New("order-acknowledgement.html").Funcs(funcMap).ParseFiles(pathSet...)
		if err == nil {
			break
		}
	}

	if tmpl == nil || err != nil {
		fmt.Printf("Error parsing template from any path: %v\n", err)
		return ""
	}

	var buf bytes.Buffer
	if err := tmpl.Execute(&buf, templateData); err != nil {
		fmt.Printf("Error executing template: %v\n", err)
		return ""
	}

	return buf.String()
}