package tools

import (
	"io/ioutil"
	"log"
	"os"
	"r2go/api"
	"r2go/utils"
	"regexp"
	"strings"
)

// ExposeModString removes user-error surrounding the mod string.
func ExposeModString(input string) string {
	reg := regexp.MustCompile(`\-([0-9]+)\.([0-9]+)\.([0-9]+)`)
	res := reg.ReplaceAllString(input, "")
	return res
}

// DownloadMod gets the download URL and installs the mod in the correct folder
// DownloadMod returns 0 if the download is sucessful, and 1 if it is already installed
// DownlaodMod returns 2 if the mod updated, and 3 if the mod could not be found.
func DownloadMod(depString string) (int, string, []string) {
	var status int
	var modver string
	var deps []string

	if depString == "R2API" {
		depString = "tristanmcpherson-R2API"
	}

	sysinfo := utils.GetSysInfo()
	status, mod := api.GetModData(depString)
	if status != 0 {
		return 3, "not_found", deps
	}
	downloadURL := mod.Versions[0].DownloadURL

	modName := sysinfo.ProgDir + "/dl/" + depString + ".zip"

	modVersion := mod.Versions[0].VersionNumber
	modFolder := sysinfo.PluginDir + "/" + depString + "-" + modVersion

	if utils.PathExists(modFolder) {
		return 1, modver, deps
	}

	status, mod = api.GetModData(depString)
	if len(mod.Versions) >= 2 {
		modVersionOld := mod.Versions[1].VersionNumber
		modFolderOld := sysinfo.PluginDir + "/" + depString + "-" + modVersionOld

		if utils.PathExists(modFolderOld) {
			defer os.RemoveAll(modFolderOld)
			status = 2
			modver = modVersion
		} else {
			status = 0
		}
	}

	err := utils.DownloadFile(modName, downloadURL)
	utils.CheckErr(err)

	unzip, err := utils.Unzip(modName, modFolder)
	log.Println(unzip)
	utils.CheckErr(err)

	for _, dep := range mod.Versions[0].Dependencies {
		deps = append(deps, dep)
	}

	return status, modver, deps
}

// RemoveMod uninstalls a mod
// RemoveMod returns 2 if the mod string was not found, 1 if the mod isn't installed and 0 on success
func RemoveMod(depString string) int {
	status, mod := api.GetModData(depString)
	if status != 0 {
		return 2
	}
	modFolder := utils.SystemInfo.PluginDir + "/" + depString + "-" + mod.Versions[0].VersionNumber

	if !utils.PathExists(modFolder) {
		return 1
	}
	defer os.RemoveAll(modFolder)
	return 0
}

// ToggleMods toggles mods on or off.
// TODO: make this not hardcoded as shit, perhaps implement a proper parser
func ToggleMods() bool {
	var configFile string = utils.SystemInfo.GameDir + "/doorstop_config.ini"

	input, err := ioutil.ReadFile(configFile)
	utils.CheckErr(err)

	lines := strings.Split(string(input), "\n")

	var status bool

	if strings.Contains(lines[2], "true") {
		status = false
		lines[2] = "enabled=false"
	} else {
		status = true
		lines[2] = "enabled=true"
	}

	output := strings.Join(lines, "\n")
	err = ioutil.WriteFile(configFile, []byte(output), 0644)
	utils.CheckErr(err)

	return status
}