package app

import (
	"fmt"
	"io"
	"os"
	"unicode/utf8"
)

type DbAttr struct {
	Key  string
	Val  string
	Bin  []byte
	Args []string
	Tags []string
	File string
}

func (attr *DbAttr) ParseKV() error {
	switch len(attr.Args) {
	case 1:
		// 1 arg = key + read from file or stdin
		attr.Key = attr.Args[0]
		if attr.File == "" {
			attr.File = "-"
		}
	case 2:
		attr.Key = attr.Args[0]
		attr.Val = attr.Args[1]

		if attr.Args[1] == "-" {
			attr.File = "-"
		}
	}

	if attr.File != "" {
		return attr.GetFileValue()
	}

	return nil
}

func (attr *DbAttr) GetFileValue() error {
	var fd io.Reader

	if attr.File == "-" {
		stat, _ := os.Stdin.Stat()
		if (stat.Mode() & os.ModeCharDevice) == 0 {
			fd = os.Stdin
		}
	} else {
		filehandle, err := os.OpenFile(attr.File, os.O_RDONLY, 0600)
		if err != nil {
			return err
		}

		fd = filehandle
	}

	if fd != nil {
		// read from file or stdin pipe
		data, err := io.ReadAll(fd)
		if err != nil {
			return err
		}

		// poor man's text file test
		sdata := string(data)
		if utf8.ValidString(sdata) {
			attr.Val = sdata
		} else {
			attr.Bin = data
		}
	} else {
		// read from console stdin
		var input string
		var data string

		for {
			_, err := fmt.Scanln(&input)
			if err != nil {
				break
			}
			data += input + "\n"
		}

		attr.Val = data
	}

	return nil
}