Bot handlers: clock‑in/out, remote flag, day‑off toggle, daily report, monthly Excel export

internal/bot/export.go

@@ -0,0 +1,76 @@
+package bot
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/xuri/excelize/v2"
+
+	"worktimeBot/internal/db"
+)
+
+// GenerateMonthlyReport creates an Excel spreadsheet for the given month.
+func GenerateMonthlyReport(store *db.Store, year int, month time.Month) ([]byte, error) {
+	f := excelize.NewFile()
+	defer func() { _ = f.Close() }()
+
+	sheet := "Report"
+	// Create a new sheet
+	index, err := f.NewSheet(sheet)
+	if err != nil {
+		return nil, err
+	}
+	f.SetActiveSheet(index)
+
+	// Header row
+	headers := []string{"Date", "Work Duration (h)", "Pairs"}
+	for i, h := range headers {
+		cell, _ := excelize.CoordinatesToCellName(i+1, 1)
+		if err := f.SetCellValue(sheet, cell, h); err != nil {
+			return nil, err
+		}
+	}
+
+	row := 2
+	loc := time.Now().Location()
+	firstDay := time.Date(year, month, 1, 0, 0, 0, 0, loc)
+	lastDay := firstDay.AddDate(0, 1, -1)
+
+	for d := firstDay; d.Before(lastDay.AddDate(0, 0, 1)); d = d.AddDate(0, 0, 1) {
+		dateStr := d.Format("2006-01-02")
+		isOff, err := store.IsDayOff(dateStr)
+		if err != nil {
+			return nil, err
+		}
+		if isOff {
+			continue // skip day‑offs
+		}
+		events, err := store.EventsForDay(dateStr)
+		if err != nil {
+			return nil, err
+		}
+		totals := ComputeDailyTotals(events)
+		hours := float64(totals.TotalSeconds) / 3600.0
+
+		cellDate, _ := excelize.CoordinatesToCellName(1, row)
+		cellHours, _ := excelize.CoordinatesToCellName(2, row)
+		cellPairs, _ := excelize.CoordinatesToCellName(3, row)
+
+		if err := f.SetCellValue(sheet, cellDate, dateStr); err != nil {
+			return nil, err
+		}
+		if err := f.SetCellValue(sheet, cellHours, fmt.Sprintf("%.2f", hours)); err != nil {
+			return nil, err
+		}
+		if err := f.SetCellValue(sheet, cellPairs, totals.PairCount); err != nil {
+			return nil, err
+		}
+		row++
+	}
+
+	buf, err := f.WriteToBuffer()
+	if err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}