package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
)

func fileOpen(fname string) {
	f, err := os.Open(fname)

	if err != nil && os.IsNotExist(err) {
		// create file if it doesn't exist
		if f, err = os.Create(fname); err != nil {
			log.Fatal(err)
		}

		state.rows = []string{""}
		state.Cy = 0
		state.Cx = 0
	} else if err != nil {
		log.Fatal(err)
	} else {
		fread := bufio.NewScanner(f)
		fread.Split(bufio.ScanLines)
		state.rows = nil
		for fread.Scan() {
			state.rows = append(state.rows, fread.Text())
		}

		if len(state.rows) == 0 || (len(state.rows) == 1 && state.rows[0] == "") {
			state.rows = []string{""}
		}
	}

	f.Close()

	state.file = fname
}

func fileSave() {
	f, err := os.Create(state.file)
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	bytesWritten := 0
	charsWritten := 0
	linesWritten := 0
	for _, row := range state.rows {
		bw, err := fmt.Fprintf(f, "%s\n", row)
		if err != nil {
			log.Fatalf("COULD NOT SAVE FILE: %v", err)
		}
		bytesWritten += bw
		charsWritten += len([]rune(row)) + 1
		linesWritten++
	}

	state.StatusLines[1] = fmt.Sprintf(
		"'%s' saved. %dL, %dC, %d bytes", 
		state.file, 
		linesWritten, 
		charsWritten, 
		bytesWritten,
	)

}