package pdf

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

// PackingListLineItemTemplateData represents a packing list line item for template rendering
type PackingListLineItemTemplateData struct {
	Title       string
	Description template.HTML
	Quantity    string
	Weight      string
}

// BuildPackingListHTML generates the complete HTML for a packing list using templates
func (g *HTMLDocumentGenerator) BuildPackingListHTML(data *PackingListPDFData, totalPages int, currentPage int) string {
	packingListNumber := data.PackingList.CmcReference

	// Prepare line items
	lineItemsData := []PackingListLineItemTemplateData{}

	for _, item := range data.LineItems {
		lineItemsData = append(lineItemsData, PackingListLineItemTemplateData{
			Title:       item.Title,
			Description: template.HTML(item.Description),
			Quantity:    item.Quantity,
			Weight:      "", // Weight not currently in LineItem model
		})
	}

	// Prepare template data
	templateData := struct {
		PackingListNumber   string
		IssueDateString     string
		JobTitle            string
		CustomerOrderNumber string
		FromAddress         string
		ShipTo              string
		LineItems           []PackingListLineItemTemplateData
		LogoDataURI         string
	}{
		PackingListNumber:   packingListNumber,
		IssueDateString:     data.IssueDateString,
		JobTitle:            data.JobTitle,
		CustomerOrderNumber: data.CustomerOrderNumber,
		FromAddress:         "CMC TECHNOLOGIES\n1/50 Carrington Road\nMarrickville NSW 2204\nAustralia",
		ShipTo:              data.ShipTo,
		LineItems:           lineItemsData,
		LogoDataURI:         g.loadLogo("quote_logo.png"),
	}

	// Define template functions
	funcMap := template.FuncMap{}

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

	var tmpl *template.Template
	var err error

	for _, pathSet := range possiblePathSets {
		tmpl, err = template.New("packing-list.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()
}