// command saves pushes and pulls save files from my server
package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"os/exec"
	"os/user"
)

const usage = "saves <list|push|pull|link>"

func main() {
	if len(os.Args) != 2 {
		fmt.Fprintf(os.Stderr, "%s\n", usage)
		os.Exit(1)
	}

	u, err := user.Current()
	if err != nil {
		fmt.Fprintf(os.Stderr, "cannot calculate home dir: %v", err)
		os.Exit(1)
	}
	docs := fmt.Sprintf("%s/Documents", u.HomeDir)
	saves := fmt.Sprintf("%s/Documents/saves", u.HomeDir)
	appSupport := fmt.Sprintf("%s/Library/Application Support", u.HomeDir)

	var cmd *exec.Cmd
	switch os.Args[1] {
	case "pull", "push":
		if os.Args[1] == "push" {
			cmd = exec.Command("rsync", "-auv", "sj.mcquay.me:~/docs/saves", fmt.Sprintf("%s/", docs))
		} else {
			cmd = exec.Command("rsync", "-auv", fmt.Sprintf("%s/saves", docs), "sj.mcquay.me:~/docs/")
		}

		if cmd == nil {
			fmt.Fprintf(os.Stderr, "failed to populate command\n")
			os.Exit(1)
		}
		var so, se bytes.Buffer
		cmd.Stdout = &so
		cmd.Stderr = &se
		if rc := cmd.Run(); rc != nil {
			log.Printf("cmd: %+v", cmd)
			log.Printf("so: %s", so.Bytes())
			log.Printf("se: %s", se.Bytes())
			log.Printf("rc: %+v", rc)
		}
	case "link", "ln":
		dirs, err := ioutil.ReadDir(saves)
		if err != nil {
			fmt.Fprintf(os.Stderr, "could not read saves dir: %+v\n", err)
			os.Exit(1)
		}

		for _, dir := range dirs {
			src := fmt.Sprintf("%s/%s", saves, dir.Name())
			dst := fmt.Sprintf("%s/%s", appSupport, dir.Name())
			if err := os.RemoveAll(dst); err != nil {
				fmt.Fprintf(os.Stderr, "could not make way for link:%+v\n", err)
				os.Exit(1)
			}
			if err := os.Symlink(src, dst); err != nil {
				fmt.Fprintf(os.Stderr, "could not link:%+v\n", err)
				os.Exit(1)
			}
		}
	case "list", "ls":
		known := map[string]bool{}
		dirs, err := ioutil.ReadDir(saves)
		if err != nil {
			fmt.Fprintf(os.Stderr, "could not read saves dir: %+v\n", err)
			os.Exit(1)
		}
		for _, dir := range dirs {
			status := "l"
			dst := fmt.Sprintf("%s/%s", appSupport, dir.Name())
			if _, err := os.Lstat(dst); os.IsNotExist(err) {
				status = "m"
			}
			fmt.Printf("%s %s\n", status, dir.Name())
			known[dir.Name()] = true
		}
		dirs, err = ioutil.ReadDir(appSupport)
		if err != nil {
			fmt.Fprintf(os.Stderr, "could not read saves dir: %+v\n", err)
			os.Exit(1)
		}
		for _, dir := range dirs {
			if dir.Mode()&os.ModeSymlink == os.ModeSymlink {
				if _, ok := known[dir.Name()]; !ok {
					fmt.Fprintf(os.Stderr, "? %s\n", dir.Name())
				}
			}
		}
	default:
		fmt.Fprintf(os.Stderr, "%s\n", usage)
		os.Exit(1)
	}
}