package routes

import (
	"bssapp-backend/queries"
	"bytes"
	"database/sql"
	"fmt"
	"net/http"
	"strings"
	"time"

	"github.com/jung-kurt/gofpdf"
)

type orderListPDFRow struct {
	OrderNumber        string
	OrderDate          string
	TerminTarihi       string
	CurrAccCode        string
	CurrAccDescription string
	MusteriTemsilcisi  string
	Piyasa             string
	DocCurrencyCode    string
	TotalAmount        float64
	TotalAmountUSD     float64
	PackedUSD          float64
	PackedRatePct      float64
	HasUretimUrunu     bool
	Description        string
}

func OrderListPDFRoute(db *sql.DB) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		search := strings.TrimSpace(r.URL.Query().Get("search"))
		currAcc := strings.TrimSpace(r.URL.Query().Get("CurrAccCode"))
		orderDate := strings.TrimSpace(r.URL.Query().Get("OrderDate"))

		rows, err := queries.GetOrderListExcel(db, search, currAcc, orderDate)
		if err != nil {
			http.Error(w, "db error: "+err.Error(), http.StatusInternalServerError)
			return
		}
		defer rows.Close()

		out := make([]orderListPDFRow, 0, 256)
		for rows.Next() {
			var (
				id, no, date, termin, code, name string
				rep, piyasa, cur                 string
				total                            float64
				totalUSD                         float64
				packedAmount                     float64
				packedUSD                        float64
				packedRatePct                    float64
				hasUretim                        bool
				desc                             string
				usdRate                          float64
			)

			if err := rows.Scan(
				&id,
				&no,
				&date,
				&termin,
				&code,
				&name,
				&rep,
				&piyasa,
				&cur,
				&total,
				&totalUSD,
				&packedAmount,
				&packedUSD,
				&packedRatePct,
				&hasUretim,
				&desc,
				&usdRate,
			); err != nil {
				http.Error(w, "scan error: "+err.Error(), http.StatusInternalServerError)
				return
			}

			_ = packedAmount
			_ = usdRate

			out = append(out, orderListPDFRow{
				OrderNumber:        no,
				OrderDate:          date,
				TerminTarihi:       termin,
				CurrAccCode:        code,
				CurrAccDescription: name,
				MusteriTemsilcisi:  rep,
				Piyasa:             piyasa,
				DocCurrencyCode:    cur,
				TotalAmount:        total,
				TotalAmountUSD:     totalUSD,
				PackedUSD:          packedUSD,
				PackedRatePct:      packedRatePct,
				HasUretimUrunu:     hasUretim,
				Description:        desc,
			})
		}

		pdf := gofpdf.New("L", "mm", "A4", "")
		pdf.SetMargins(8, 8, 8)
		pdf.SetAutoPageBreak(true, 10)
		if err := registerDejavuFonts(pdf, "dejavu"); err != nil {
			http.Error(w, "pdf font error: "+err.Error(), http.StatusInternalServerError)
			return
		}

		drawOrderListPDF(pdf, out, search, currAcc, orderDate)
		if err := pdf.Error(); err != nil {
			http.Error(w, "pdf render error: "+err.Error(), http.StatusInternalServerError)
			return
		}

		var buf bytes.Buffer
		if err := pdf.Output(&buf); err != nil {
			http.Error(w, "pdf output error: "+err.Error(), http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Type", "application/pdf")
		w.Header().Set("Content-Disposition", "inline; filename=\"siparis-listesi.pdf\"")
		_, _ = w.Write(buf.Bytes())
	})
}

func drawOrderListPDF(pdf *gofpdf.Fpdf, rows []orderListPDFRow, search, currAcc, orderDate string) {
	headers := []string{
		"Siparis No", "Tarih", "Termin", "Cari Kod", "Cari Adi", "Temsilci", "Piyasa",
		"PB", "Tutar", "USD", "Paket USD", "%", "Uretim", "Aciklama",
	}
	widths := []float64{24, 14, 14, 18, 34, 16, 12, 8, 18, 18, 18, 10, 14, 43}

	pdf.AddPage()
	pdf.SetFont("dejavu", "B", 12)
	pdf.CellFormat(0, 7, "Siparis Listesi", "", 1, "L", false, 0, "")

	pdf.SetFont("dejavu", "", 8)
	filterLine := fmt.Sprintf(
		"Filtreler -> Arama: %s | Cari: %s | Siparis Tarihi: %s | Uretim: %s",
		emptyDash(search), emptyDash(currAcc), emptyDash(orderDate), time.Now().Format("2006-01-02 15:04"),
	)
	pdf.CellFormat(0, 5, filterLine, "", 1, "L", false, 0, "")
	pdf.Ln(1)

	pdf.SetFont("dejavu", "B", 8)
	pdf.SetFillColor(240, 240, 240)
	for i, h := range headers {
		pdf.CellFormat(widths[i], 6, h, "1", 0, "C", true, 0, "")
	}
	pdf.Ln(-1)

	pdf.SetFont("dejavu", "", 7)
	for _, row := range rows {
		uretim := ""
		if row.HasUretimUrunu {
			uretim = "VAR"
		}

		cells := []string{
			row.OrderNumber,
			row.OrderDate,
			row.TerminTarihi,
			row.CurrAccCode,
			shorten(row.CurrAccDescription, 24),
			shorten(row.MusteriTemsilcisi, 12),
			shorten(row.Piyasa, 10),
			row.DocCurrencyCode,
			fmt.Sprintf("%.2f", row.TotalAmount),
			fmt.Sprintf("%.2f", row.TotalAmountUSD),
			fmt.Sprintf("%.2f", row.PackedUSD),
			fmt.Sprintf("%.2f", row.PackedRatePct),
			uretim,
			shorten(row.Description, 34),
		}

		for i, v := range cells {
			align := "L"
			if i >= 8 && i <= 11 {
				align = "R"
			}
			if i == 1 || i == 2 || i == 7 || i == 12 {
				align = "C"
			}
			pdf.CellFormat(widths[i], 5, v, "1", 0, align, false, 0, "")
		}
		pdf.Ln(-1)
	}
}

func emptyDash(v string) string {
	if strings.TrimSpace(v) == "" {
		return "-"
	}
	return v
}

func shorten(v string, max int) string {
	s := strings.TrimSpace(v)
	if len([]rune(s)) <= max {
		return s
	}
	r := []rune(s)
	if max <= 1 {
		return string(r[:1])
	}
	return string(r[:max-1]) + "…"
}