package main

import (
	"bufio"
	"fmt"
	"os"
	"os/exec"
	"strings"

	alpm "github.com/Jguer/go-alpm"
	pacmanconf "github.com/Morganamilo/go-pacmanconf"
	"github.com/leonelquinteros/gotext"

	"github.com/Jguer/yay/v10/pkg/settings"
	"github.com/Jguer/yay/v10/pkg/text"
)

// Verbosity settings for search
const (
	numberMenu = iota
	detailed
	minimal
)

const (
	modeAUR targetMode = iota
	modeRepo
	modeAny
)

type targetMode int

var yayVersion = "10.0.0"

var localePath = "/usr/share/locale"

// configFileName holds the name of the config file.
const configFileName string = "config.json"

// vcsFileName holds the name of the vcs file.
const vcsFileName string = "vcs.json"

// configHome handles config directory home
var configHome string

// cacheHome handles cache home
var cacheHome string

// savedInfo holds the current vcs info
var savedInfo vcsInfo

// configfile holds yay config file path.
var configFile string

// vcsfile holds yay vcs info file path.
var vcsFile string

// shouldSaveConfig holds whether or not the config should be saved
var shouldSaveConfig bool

// YayConf holds the current config values for yay.
var config *settings.Configuration

// AlpmConf holds the current config values for pacman.
var pacmanConf *pacmanconf.Config

// AlpmHandle is the alpm handle used by yay.
var alpmHandle *alpm.Handle

// Mode is used to restrict yay to AUR or repo only modes
var mode = modeAny

var hideMenus = false

func defaultSettings() *settings.Configuration {
	newConfig := &settings.Configuration{
		AURURL:             "https://aur.archlinux.org",
		BuildDir:           "$HOME/.cache/yay",
		ABSDir:             "$HOME/.cache/yay/abs",
		CleanAfter:         false,
		Editor:             "",
		EditorFlags:        "",
		Devel:              false,
		MakepkgBin:         "makepkg",
		MakepkgConf:        "",
		NoConfirm:          false,
		PacmanBin:          "pacman",
		PGPFetch:           true,
		PacmanConf:         "/etc/pacman.conf",
		GpgFlags:           "",
		MFlags:             "",
		GitFlags:           "",
		SortMode:           settings.BottomUp,
		CompletionInterval: 7,
		SortBy:             "votes",
		SearchBy:           "name-desc",
		SudoLoop:           false,
		GitBin:             "git",
		GpgBin:             "gpg",
		SudoBin:            "sudo",
		SudoFlags:          "",
		TimeUpdate:         false,
		RequestSplitN:      150,
		ReDownload:         "no",
		ReBuild:            "no",
		BatchInstall:       false,
		AnswerClean:        "",
		AnswerDiff:         "",
		AnswerEdit:         "",
		AnswerUpgrade:      "",
		RemoveMake:         "ask",
		Provides:           true,
		UpgradeMenu:        true,
		CleanMenu:          true,
		DiffMenu:           true,
		EditMenu:           false,
		UseAsk:             false,
		CombinedUpgrade:    false,
	}

	if os.Getenv("XDG_CACHE_HOME") != "" {
		newConfig.BuildDir = "$XDG_CACHE_HOME/yay"
	}

	return newConfig
}

// Editor returns the preferred system editor.
func editor() (editor string, args []string) {
	switch {
	case config.Editor != "":
		editor, err := exec.LookPath(config.Editor)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
		} else {
			return editor, strings.Fields(config.EditorFlags)
		}
		fallthrough
	case os.Getenv("EDITOR") != "":
		if editorArgs := strings.Fields(os.Getenv("EDITOR")); len(editorArgs) != 0 {
			editor, err := exec.LookPath(editorArgs[0])
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
			} else {
				return editor, editorArgs[1:]
			}
		}
		fallthrough
	case os.Getenv("VISUAL") != "":
		if editorArgs := strings.Fields(os.Getenv("VISUAL")); len(editorArgs) != 0 {
			editor, err := exec.LookPath(editorArgs[0])
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
			} else {
				return editor, editorArgs[1:]
			}
		}
		fallthrough
	default:
		fmt.Fprintln(os.Stderr)
		text.Errorln(gotext.Get("%s is not set", bold(cyan("$EDITOR"))))
		text.Warnln(gotext.Get("Add %s or %s to your environment variables", bold(cyan("$EDITOR")), bold(cyan("$VISUAL"))))

		for {
			text.Infoln(gotext.Get("Edit PKGBUILD with?"))
			editorInput, err := getInput("")
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
				continue
			}

			editorArgs := strings.Fields(editorInput)
			if len(editorArgs) == 0 {
				continue
			}

			editor, err := exec.LookPath(editorArgs[0])
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
				continue
			}
			return editor, editorArgs[1:]
		}
	}
}

// ContinueTask prompts if user wants to continue task.
// If NoConfirm is set the action will continue without user input.
func continueTask(s string, cont bool) bool {
	if config.NoConfirm {
		return cont
	}

	var response string
	var postFix string
	yes := gotext.Get("yes")
	no := gotext.Get("no")
	y := string([]rune(yes)[0])
	n := string([]rune(no)[0])

	if cont {
		postFix = fmt.Sprintf(" [%s/%s] ", strings.ToUpper(y), n)
	} else {
		postFix = fmt.Sprintf(" [%s/%s] ", y, strings.ToUpper(n))
	}

	text.Info(bold(s), bold(postFix))

	if _, err := fmt.Scanln(&response); err != nil {
		return cont
	}

	response = strings.ToLower(response)
	return response == yes || response == y
}

func getInput(defaultValue string) (string, error) {
	text.Info()
	if defaultValue != "" || config.NoConfirm {
		fmt.Println(defaultValue)
		return defaultValue, nil
	}

	reader := bufio.NewReader(os.Stdin)

	buf, overflow, err := reader.ReadLine()
	if err != nil {
		return "", err
	}

	if overflow {
		return "", fmt.Errorf(gotext.Get("input too long"))
	}

	return string(buf), nil
}

func toUsage(usages []string) alpm.Usage {
	if len(usages) == 0 {
		return alpm.UsageAll
	}

	var ret alpm.Usage
	for _, usage := range usages {
		switch usage {
		case "Sync":
			ret |= alpm.UsageSync
		case "Search":
			ret |= alpm.UsageSearch
		case "Install":
			ret |= alpm.UsageInstall
		case "Upgrade":
			ret |= alpm.UsageUpgrade
		case "All":
			ret |= alpm.UsageAll
		}
	}

	return ret
}

func configureAlpm() error {
	// TODO: set SigLevel
	// sigLevel := alpm.SigPackage | alpm.SigPackageOptional | alpm.SigDatabase | alpm.SigDatabaseOptional
	// localFileSigLevel := alpm.SigUseDefault
	// remoteFileSigLevel := alpm.SigUseDefault

	for _, repo := range pacmanConf.Repos {
		// TODO: set SigLevel
		db, err := alpmHandle.RegisterSyncDB(repo.Name, 0)
		if err != nil {
			return err
		}

		db.SetServers(repo.Servers)
		db.SetUsage(toUsage(repo.Usage))
	}

	if err := alpmHandle.SetCacheDirs(pacmanConf.CacheDir); err != nil {
		return err
	}

	// add hook directories 1-by-1 to avoid overwriting the system directory
	for _, dir := range pacmanConf.HookDir {
		if err := alpmHandle.AddHookDir(dir); err != nil {
			return err
		}
	}

	if err := alpmHandle.SetGPGDir(pacmanConf.GPGDir); err != nil {
		return err
	}

	if err := alpmHandle.SetLogFile(pacmanConf.LogFile); err != nil {
		return err
	}

	if err := alpmHandle.SetIgnorePkgs(pacmanConf.IgnorePkg); err != nil {
		return err
	}

	if err := alpmHandle.SetIgnoreGroups(pacmanConf.IgnoreGroup); err != nil {
		return err
	}

	if err := alpmHandle.SetArch(pacmanConf.Architecture); err != nil {
		return err
	}

	if err := alpmHandle.SetNoUpgrades(pacmanConf.NoUpgrade); err != nil {
		return err
	}

	if err := alpmHandle.SetNoExtracts(pacmanConf.NoExtract); err != nil {
		return err
	}

	/*if err := alpmHandle.SetDefaultSigLevel(sigLevel); err != nil {
		return err
	}

	if err := alpmHandle.SetLocalFileSigLevel(localFileSigLevel); err != nil {
		return err
	}

	if err := alpmHandle.SetRemoteFileSigLevel(remoteFileSigLevel); err != nil {
		return err
	}*/

	if err := alpmHandle.SetUseSyslog(pacmanConf.UseSyslog); err != nil {
		return err
	}

	return alpmHandle.SetCheckSpace(pacmanConf.CheckSpace)
}