package api

import (
	"io"
	"net/http"
	"strings"
	"sync"
	"time"

	"codeberg.org/rimgo/rimgo/utils"
	"github.com/patrickmn/go-cache"
	"github.com/tidwall/gjson"
)

type User struct {
	Id        int64
	Bio       string
	Username  string
	Points    int64
	Cover     string
	Avatar    string
	CreatedAt string
}

type Submission struct {
	Id        string
	Title     string
	Link      string
	Cover     Media
	Points    int64
	Upvotes   int64
	Downvotes int64
	Comments  int64
	Views     int64
	IsAlbum   bool
}

func (client *Client) FetchUser(username string) (User, error) {
	cacheData, found := client.Cache.Get(username + "-user")
	if found {
		return cacheData.(User), nil
	}

	res, err := http.Get("https://api.imgur.com/account/v1/accounts/" + username + "?client_id=" + utils.Config.ImgurId)
	if err != nil {
		return User{}, err
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		return User{}, err
	}

	data := gjson.Parse(string(body))

	createdTime, _ := time.Parse(time.RFC3339, data.Get("created_at").String())

	user := User{
		Id:        data.Get("id").Int(),
		Bio:       data.Get("bio").String(),
		Username:  data.Get("username").String(),
		Points:    data.Get("reputation_count").Int(),
		Cover:     strings.ReplaceAll(data.Get("cover_url").String(), "https://imgur.com", ""),
		Avatar:    data.Get("avatar_url").String(),
		CreatedAt: createdTime.Format("January 2, 2006"),
	}

	client.Cache.Set(username+"-user", user, 1*time.Hour)
	return user, nil
}

func (client *Client) FetchSubmissions(username string, sort string, page string) ([]Submission, error) {
	cacheData, found := client.Cache.Get(username + "-submissions-" + sort + page)
	if found {
		return cacheData.([]Submission), nil
	}

	data, err := utils.GetJSON("https://api.imgur.com/3/account/" + username + "/submissions/" + page + "/" + sort + "?album_previews=1&client_id=" + utils.Config.ImgurId)
	if err != nil {
		return []Submission{}, err
	}

	submissions := []Submission{}

	wg := sync.WaitGroup{}
	data.Get("data").ForEach(
		func(key, value gjson.Result) bool {
			wg.Add(1)

			go func() {
				defer wg.Done()

				submissions = append(submissions, parseSubmission(value))
			}()

			return true
		},
	)
	wg.Wait()

	client.Cache.Set(username+"-submissions-"+sort+page, submissions, 15*time.Minute)
	return submissions, nil
}

func (client *Client) FetchUserFavorites(username string, sort string, page string) ([]Submission, error) {
	cacheData, found := client.Cache.Get(username + "-favorites-" + sort + page)
	if found {
		return cacheData.([]Submission), nil
	}

	req, err := http.NewRequest("GET", "https://api.imgur.com/3/account/"+username+"/gallery_favorites/"+page+"/"+sort, nil)
	if err != nil {
		return []Submission{}, err
	}
	utils.SetReqHeaders(req)
	q := req.URL.Query()
	q.Add("client_id", client.ClientID)
	req.URL.RawQuery = q.Encode()

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return []Submission{}, err
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		return []Submission{}, err
	}

	data := gjson.Parse(string(body))

	submissions := []Submission{}

	wg := sync.WaitGroup{}
	data.Get("data").ForEach(
		func(key, value gjson.Result) bool {
			wg.Add(1)

			go func() {
				defer wg.Done()

				submissions = append(submissions, parseSubmission(value))
			}()

			return true
		},
	)
	wg.Wait()

	client.Cache.Set(username+"-favorites-"+sort+page, submissions, 15*time.Minute)
	return submissions, nil
}

func (client *Client) FetchUserComments(username string) ([]Comment, error) {
	cacheData, found := client.Cache.Get(username + "-usercomments")
	if found {
		return cacheData.([]Comment), nil
	}

	req, err := http.NewRequest("GET", "https://api.imgur.com/comment/v1/comments", nil)
	if err != nil {
		return []Comment{}, err
	}
	utils.SetReqHeaders(req)

	q := req.URL.Query()
	q.Add("client_id", client.ClientID)
	q.Add("filter[account]", "eq:"+username)
	q.Add("include", "account,post")
	q.Add("sort", "new")

	req.URL.RawQuery = q.Encode()

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return []Comment{}, err
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		return []Comment{}, err
	}

	data := gjson.Parse(string(body))

	comments := make([]Comment, 0)
	data.Get("data").ForEach(
		func(key, value gjson.Result) bool {
			comments = append(comments, parseComment(value))
			return true
		},
	)

	client.Cache.Set(username+"-usercomments", comments, cache.DefaultExpiration)
	return comments, nil
}

func parseSubmission(value gjson.Result) Submission {
	var cover Media
	c := value.Get("cover")
	coverData := value.Get("images.#(id==\"" + c.String() + "\")")
	switch {
	case c.Type == gjson.String && coverData.Exists():
		cover = Media{
			Id:          coverData.Get("id").String(),
			Description: coverData.Get("description").String(),
			Type:        strings.Split(coverData.Get("type").String(), "/")[0],
			Url:         coverData.Get("link").String(),
		}
	// This case is when fetching comments
	case c.Type != gjson.Null:
		cover = Media{
			Id:  c.Get("id").String(),
			Url: c.Get("url").String(),
		}
		// Replace with thumbnails here because it's easier.
		if strings.HasSuffix(cover.Url, ".mp4") {
			cover.Url = cover.Url[:len(cover.Url)-3] + "webp"
		}
	default:
		cover = Media{
			Id:          value.Get("id").String(),
			Description: value.Get("description").String(),
			Type:        strings.Split(value.Get("type").String(), "/")[0],
			Url:         value.Get("link").String(),
		}
	}

	id := value.Get("id").String()

	link := "/a/" + id
	if value.Get("in_gallery").Bool() {
		link = "/gallery/" + id
	}

	return Submission{
		Id:        id,
		Link:      link,
		Title:     value.Get("title").String(),
		Cover:     cover,
		Points:    value.Get("points").Int(),
		Upvotes:   value.Get("ups").Int(),
		Downvotes: value.Get("downs").Int(),
		Comments:  value.Get("comment_count").Int(),
		Views:     value.Get("views").Int(),
		IsAlbum:   value.Get("is_album").Bool(),
	}
}