package main 

import (
	bt "badtudexo"
	st "saggytrousers"
	"fmt"
	"os"
	xl "github.com/xuri/excelize/v2"
)

// This program has the function of finding duplicate values in a column. It
// will spit them back as output if they exist. Useful, to, e.g. check
// duplicates in a reference that should be unique.

func usage() {
	fmt.Println(`bt-duplref: check for duplicates.

This program allows you to check whether there are any duplicates in a given 
file column. This can be handy as a check for, e.g. transaction references.

Note: Speed
-----------
A downside to this program at the moment is the algorithm used is O(N^2), so 
does not scale well. It should be performant enough for a few thousand rows,
but beyond that it may become a bit slow.

	`)
	os.Exit(-1)
}

func parseArgs(args []string) {
	for i := 0; i < len(args); i++ {
		arg := args[i]
		switch arg {
		case "-h", "help", "--help":
			usage()
		case "-v", "--verbose": 
			verbose = true
		case "--no-verbose", "--quiet", "-q":
			verbose = false
		default:
			i++
			g_file = args[i]
		}
	}
}

var g_file string
var verbose bool = true

func main() {
	args := os.Args
	parseArgs(args)

	file, err := xl.OpenFile(g_file)
	if err != nil {
		fmt.Println("Could not open file.")
	}

	sheet := st.SelectSheet(file, "")
	columnIdx := st.SelectHeader(file, sheet, "", /* exact: */ false)
	columns, err := file.GetCols(sheet)
	if err != nil {
		fmt.Println("Could not get columns.")
		return
	}
	column := columns[columnIdx]

	// Do the thing. 
	if verbose { fmt.Println("Loaded file, now checking duplicates...") }
	dupls := bt.Duplicate(column)

	// Output. 
	for _, d := range dupls {
		v := d.Value
		i := d.Index
		fmt.Printf("Duplicate at index %d is %v\n", i, v)
	}
}