package api

import (
	"encoding/json"
	"io/ioutil"
	"os"
	"r2go/utils"
	"time"

	"github.com/lithammer/fuzzysearch/fuzzy"
)

// PkgList contains all mods in current package cache
var PkgList []Mod

// Mod contains info about a mod from thunderstore API
type Mod struct {
	Name           string    `json:"name"`
	FullName       string    `json:"full_name"`
	PackageURL     string    `json:"package_url"`
	DateCreated    string    `json:"date_created"`
	DateUpdated    string    `json:"date_updated"`
	UUID4          string    `json:"uuid4"`
	RatingScore    int       `json:"rating_score"`
	IsPinned       bool      `json:"is_pinned"`
	IsDeprecated   bool      `json:"is_deprecated"`
	HasNSFWContent bool      `json:"has_nsfw_content"`
	Categories     []string  `json:"categories"`
	Versions       []Version `json:"versions"`
}

// Version contains info about a specific version of a mod
type Version struct {
	Name          string   `json:"name"`
	FullName      string   `json:"full_name"`
	Description   string   `json:"description"`
	Icon          string   `json:"icon"`
	VersionNumber string   `json:"version_number"`
	Dependencies  []string `json:"dependencies"`
	DownloadURL   string   `json:"download_url"`
	Downloads     int      `json:"downloads"`
	DateCreated   string   `json:"date_created"`
	WebsiteURL    string   `json:"website_url"`
	IsActive      bool     `json:"is_active"`
	UUID4         string   `json:"uuid4"`
}

// InitAPI stores the API in an object when needed.
func InitAPI() {
	if CheckAPICache() != 0 {
		UpdateAPICache()
	}

	PkgList = UnpackAPI()
}

// CheckAPICache checks if the cached json is expired
func CheckAPICache() int {
	if !utils.PathExists(utils.SystemInfo.ProgDir + "/pkg.json") {
		return 1
	}

	info, err := os.Stat(utils.SystemInfo.ProgDir + "/pkg.json")
	utils.CheckErr(err)

	lastModTime := info.ModTime()
	currentTime := time.Now()

	if currentTime.Sub(lastModTime).Seconds() > 7200 {
		return 1
	}

	return 0
}

// UpdateAPICache gets a new copy of the thunderstore pkgfile
func UpdateAPICache() {
	apiURL := "https://thunderstore.io/api/v1/package/"

	err := utils.DownloadFile(utils.SystemInfo.ProgDir+"/pkg.json", apiURL)
	utils.CheckErr(err)
}

// UnpackAPI stores the API cache as an object for later use.
func UnpackAPI() []Mod {
	pkgFile, err := os.Open(utils.SystemInfo.ProgDir + "/pkg.json")
	utils.CheckErr(err)

	defer pkgFile.Close()

	byteValue, err := ioutil.ReadAll(pkgFile)
	utils.CheckErr(err)

	var mods []Mod

	err = json.Unmarshal(byteValue, &mods)
	utils.CheckErr(err)

	return mods
}

// SearchMods finds mods that match a fuzzy search
func SearchMods(inp string) fuzzy.Ranks {
	var pkgNames []string

	for _, mod := range PkgList {
		pkgNames = append(pkgNames, mod.FullName)
	}

	results := fuzzy.RankFindFold(inp, pkgNames)

	return results
}

// GetModData gets object of mod by depString
func GetModData(depString string) (int, Mod) {
	if depString == "R2API" {
		depString = "tristanmcpherson-R2API"
	}

	for i := 0; i < len(PkgList); i++ {
		if PkgList[i].FullName == depString {
			return 0, PkgList[i]
		}
	}

	return 1, Mod{}
}