package controller

import (
	"fmt"
	"time"

	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"

	"github.com/gofiber/fiber/v2"
	"github.com/xuri/excelize/v2"
)

func exportStockLogListExcel(c *fiber.Ctx, stockLogs []entity.StockLog) error {
	file := excelize.NewFile()
	defer file.Close()

	sheet := "Stock Logs"
	file.SetSheetName("Sheet1", sheet)

	headers := []string{
		"ID",
		"Tanggal",
		"Gudang",
		"Stok Akhir",
		"Peningkatan",
		"Penurunan",
		"Jenis Transaksi",
		"Catatan",
		"Oleh",
	}

	// Column widths
	colWidths := map[string]float64{
		"A": 8,
		"B": 20,
		"C": 25,
		"D": 14,
		"E": 14,
		"F": 14,
		"G": 20,
		"H": 30,
		"I": 20,
	}
	for col, width := range colWidths {
		file.SetColWidth(sheet, col, col, width)
	}

	// Header style
	headerStyle, _ := file.NewStyle(&excelize.Style{
		Font: &excelize.Font{
			Bold: true,
			Size: 11,
		},
		Fill: excelize.Fill{
			Type:    "pattern",
			Pattern: 1,
			Color:   []string{"D9E1F2"},
		},
		Border: []excelize.Border{
			{Type: "bottom", Style: 1, Color: "000000"},
		},
	})

	// Write header row
	for i, h := range headers {
		cell, _ := excelize.CoordinatesToCellName(i+1, 1)
		file.SetCellValue(sheet, cell, h)
		file.SetCellStyle(sheet, cell, cell, headerStyle)
	}

	// Freeze header row
	file.SetPanes(sheet, &excelize.Panes{
		Freeze:      true,
		YSplit:      1,
		TopLeftCell: "A2",
		ActivePane:  "bottomLeft",
	})

	// Write data rows
	for i, log := range stockLogs {
		row := i + 2

		warehouseName := ""
		if log.ProductWarehouse != nil {
			warehouseName = log.ProductWarehouse.Warehouse.Name
		}

		userName := ""
		if log.CreatedUser != nil {
			userName = log.CreatedUser.Name
		}

		notes := ""
		if log.Notes != "" {
			notes = log.Notes
		}

		file.SetCellInt(sheet, fmt.Sprintf("A%d", row), int(log.Id))
		file.SetCellValue(sheet, fmt.Sprintf("B%d", row), log.CreatedAt.Format("2006-01-02 15:04:05"))
		file.SetCellValue(sheet, fmt.Sprintf("C%d", row), warehouseName)
		file.SetCellFloat(sheet, fmt.Sprintf("D%d", row), log.Stock, 3, 64)
		file.SetCellFloat(sheet, fmt.Sprintf("E%d", row), log.Increase, 3, 64)
		file.SetCellFloat(sheet, fmt.Sprintf("F%d", row), log.Decrease, 3, 64)
		file.SetCellValue(sheet, fmt.Sprintf("G%d", row), log.LoggableType)
		file.SetCellValue(sheet, fmt.Sprintf("H%d", row), notes)
		file.SetCellValue(sheet, fmt.Sprintf("I%d", row), userName)
	}

	buffer, err := file.WriteToBuffer()
	if err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, "failed to generate excel file")
	}

	filename := fmt.Sprintf("stock_logs_%s.xlsx", time.Now().Format("20060102_150405"))
	c.Set("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
	c.Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, filename))
	return c.Status(fiber.StatusOK).Send(buffer.Bytes())
}