package yay

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

	"github.com/jguer/yay/aur"
	pac "github.com/jguer/yay/pacman"
)

// BuildDir is the root for package building
const BuildDir string = "/tmp/yaytmp/"

// SearchMode is search without numbers.
const SearchMode int = -1

// SortMode NumberMenu and Search
var SortMode = DownTop

// NoConfirm ignores prompts.
var NoConfirm = false

// Determines NumberMenu and Search Order
const (
	DownTop = iota
	TopDown
)

// Config copies settings over to AUR and Pacman packages
func Config() {
	aur.SortMode = SortMode
	pac.SortMode = SortMode
	aur.NoConfirm = NoConfirm
	pac.NoConfirm = NoConfirm
}

// NumberMenu presents a CLI for selecting packages to install.
func NumberMenu(pkgName string, flags []string) (err error) {
	var num int
	var numberString string

	a, nA, err := aur.Search(pkgName, true)
	if err != nil {
		fmt.Println("Error during AUR search:", err)
	}
	r, nR, err := pac.Search(pkgName)
	if err != nil {
		return
	}

	if nR == 0 && nA == 0 {
		return fmt.Errorf("no packages match search")
	}

	if aur.SortMode == aur.DownTop {
		a.PrintSearch(nR)
		r.PrintSearch(0)
	} else {
		r.PrintSearch(0)
		a.PrintSearch(nR)
	}

	fmt.Printf("\x1b[32m%s\x1b[0m\nNumbers:", "Type numbers to install. Separate each number with a space.")
	reader := bufio.NewReader(os.Stdin)
	numberString, err = reader.ReadString('\n')
	if err != nil {
		fmt.Println(err)
		return
	}

	var aurInstall []aur.Result
	var repoInstall []string
	result := strings.Fields(numberString)
	for _, numS := range result {
		num, err = strconv.Atoi(numS)
		if err != nil {
			continue
		}

		// Install package
		if num > nA+nR-1 || num < 0 {
			continue
		} else if num > nR-1 {
			if aur.SortMode == aur.DownTop {
				aurInstall = append(aurInstall, a[nA+nR-num-1])
			} else {
				aurInstall = append(aurInstall, a[num-nR])
			}
		} else {
			if aur.SortMode == aur.DownTop {
				repoInstall = append(repoInstall, r[nR-num-1].Name)
			} else {
				repoInstall = append(repoInstall, r[num].Name)
			}
		}
	}

	if len(repoInstall) != 0 {
		pac.Install(repoInstall, flags)
	}

	for _, aurpkg := range aurInstall {
		err = aurpkg.Install(BuildDir, flags)
		if err != nil {
			// Do not abandon program, we might still be able to install the rest
			fmt.Println(err)
		}
	}
	return
}

// Install handles package installs
func Install(pkgs []string, flags []string) error {
	aurs, repos, _ := pac.PackageSlices(pkgs)

	err := pac.Install(repos, flags)
	if err != nil {
		fmt.Println("Error installing repo packages.")
	}

	q, n, err := aur.MultiInfo(aurs)
	if len(aurs) != n || err != nil {
		fmt.Println("Unable to get info on some packages")
	}

	for _, aurpkg := range q {
		err = aurpkg.Install(BuildDir, flags)
		if err != nil {
			fmt.Println("Error installing", aurpkg.Name, ":", err)
		}
	}

	return nil
}

// Upgrade handles updating the cache and installing updates.
func Upgrade(flags []string) error {
	errp := pac.UpdatePackages(flags)
	erra := aur.Upgrade(BuildDir, flags)

	if errp != nil {
		return errp
	}

	return erra
}

// Search presents a query to the local repos and to the AUR.
func Search(pkg string) (err error) {
	a, _, err := aur.Search(pkg, true)
	if err != nil {
		return err
	}
	r, _, err := pac.Search(pkg)
	if err != nil {
		return err
	}

	if SortMode == aur.DownTop {
		a.PrintSearch(SearchMode)
		r.PrintSearch(SearchMode)
	} else {
		r.PrintSearch(SearchMode)
		a.PrintSearch(SearchMode)
	}

	return nil
}

// LocalStatistics returns installed packages statistics.
func LocalStatistics(version string) error {
	pkgmap, info, err := pac.Statistics()
	if err != nil {
		return err
	}

	fmt.Printf("\n Yay version r%s\n", version)
	fmt.Println("\x1B[1;34m===========================================\x1B[0m")
	fmt.Printf("\x1B[1;32mTotal installed packages: \x1B[0;33m%d\x1B[0m\n", info.Totaln)
	fmt.Printf("\x1B[1;32mExplicitly installed packages: \x1B[0;33m%d\x1B[0m\n", info.Expln)
	fmt.Printf("\x1B[1;32mTotal Size occupied by packages: \x1B[0;33m%s\x1B[0m\n", size(info.TotalSize))
	fmt.Println("\x1B[1;34m===========================================\x1B[0m")
	fmt.Println("\x1B[1;32mTen biggest packages\x1B[0m")
	for name, psize := range pkgmap {
		fmt.Printf("%s: \x1B[0;33m%s\x1B[0m\n", name, size(psize))
	}
	fmt.Println("\x1B[1;34m===========================================\x1B[0m")

	return nil
}

// Function by pyk https://github.com/pyk/byten
func index(s int64) float64 {
	x := math.Log(float64(s)) / math.Log(1024)
	return math.Floor(x)
}

// Function by pyk https://github.com/pyk/byten
func countSize(s int64, i float64) float64 {
	return float64(s) / math.Pow(1024, math.Floor(i))
}

// Size return a formated string from file size
// Function by pyk https://github.com/pyk/byten
func size(s int64) string {

	symbols := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
	i := index(s)
	if s < 10 {
		return fmt.Sprintf("%dB", s)
	}
	size := countSize(s, i)
	format := "%.0f"
	if size < 10 {
		format = "%.1f"
	}

	return fmt.Sprintf(format+"%s", size, symbols[int(i)])
}

// PassToPacman outsorces execution to pacman binary without modifications.
func PassToPacman(op string, pkgs []string, flags []string) error {
	var cmd *exec.Cmd
	var args []string

	args = append(args, op)
	if len(pkgs) != 0 {
		args = append(args, pkgs...)
	}

	if len(flags) != 0 {
		args = append(args, flags...)
	}

	if strings.Contains(op, "-Q") {
		cmd = exec.Command("pacman", args...)
	} else {
		args = append([]string{"pacman"}, args...)
		cmd = exec.Command("sudo", args...)
	}

	cmd.Stdout = os.Stdout
	cmd.Stdin = os.Stdin
	cmd.Stderr = os.Stderr
	err := cmd.Run()
	return err

}