package main

import (
	"fmt"
	"strings"

	xls "github.com/extrame/xls"
)

func safeXlsRow(sheet *xls.WorkSheet, r int) (row *xls.Row) {
	defer func() { recover() }()
	return sheet.Row(r)
}

func main() {
	wb, err := xls.Open("/Users/wangjia/.claude/jobs/4f07558d/tmp/test_150rows.xls", "utf-8")
	if err != nil {
		fmt.Println("open error:", err)
		return
	}
	sheet := wb.GetSheet(0)
	if sheet == nil {
		fmt.Println("no sheet")
		return
	}
	fmt.Printf("MaxRow: %d\n", sheet.MaxRow)

	numCols := 0
	headerRow := sheet.Row(0)
	fmt.Printf("Header LastCol: %d\n", headerRow.LastCol())
	for c := 0; c < headerRow.LastCol(); c++ {
		v := strings.TrimSpace(headerRow.Col(c))
		if v != "" {
			numCols = c + 1
		}
	}
	if numCols == 0 {
		numCols = 20
	}
	fmt.Printf("numCols: %d\n", numCols)

	const maxRows = 100000
	const maxEmpty = 5
	emptyStreak := 0
	rowCount := 0
	for r := 0; r < maxRows; r++ {
		row := safeXlsRow(sheet, r)
		cells := make([]string, numCols)
		isEmpty := true
		if row != nil {
			for c := 0; c < numCols; c++ {
				cells[c] = strings.TrimSpace(row.Col(c))
				if cells[c] != "" {
					isEmpty = false
				}
			}
		}
		if isEmpty {
			emptyStreak++
			if emptyStreak >= maxEmpty {
				fmt.Printf("Breaking at r=%d after %d empty streak\n", r, emptyStreak)
				break
			}
			rowCount++
			continue
		}
		emptyStreak = 0
		rowCount++
	}
	fmt.Printf("Total rows read: %d\n", rowCount)
}