package likes

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"strconv"

	"fagott.pw/charakterin"
	"fagott.pw/grilist/cache"
	"fagott.pw/grilist/grilist"
	"fagott.pw/grilist/modules/lists"

	"github.com/julienschmidt/httprouter"
)

type Module struct {
	g     *grilist.Grilist
	c     *cache.Cache
	lists *lists.Module
}

func New() *Module {
	return &Module{}
}

func (m *Module) Name() string {
	return "Likes"
}

func (m *Module) Init(g *grilist.Grilist) {
	m.g = g
	gm, ok := g.Modules["Lists"]
	if !ok {
		log.Fatal("tags: lists module not found")
	}
	m.lists = gm.(*lists.Module)
	m.c = cache.New()
	m.g.Router.GET("/api/likes/count", m.getLikeCount)
	m.g.Router.GET("/api/likes/liked_by", m.isLikedBy)
	m.g.Router.PUT("/api/likes", m.addLike)
	m.g.Router.DELETE("/api/likes", m.removeLike)
}

func (m *Module) Interface() interface{} {
	return m
}

func (m *Module) ProvideDashboardData(user *charakterin.User) []grilist.DashboardCategory {
	return make([]grilist.DashboardCategory, 0)
}

func (m *Module) getLikeCount(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	params := r.URL.Query()

	contentId, err := strconv.Atoi(params.Get("id"))
	if err != nil {
		http.Error(w, "invalid content id", http.StatusBadRequest)
		return
	}
	contentType, err := strconv.Atoi(params.Get("type"))
	if err != nil {
		http.Error(w, "invalid content id", http.StatusBadRequest)
		return
	}

	var res int
	if err := m.g.DB.QueryRow(`SELECT COUNT(*) FROM grilist.likes WHERE content = $1 AND type = $2`, contentId, contentType).Scan(&res); err != nil {
		http.Error(w, "pq error", http.StatusInternalServerError)
		log.Printf("error getting like count: %s", err)
		return
	}

	w.WriteHeader(200)
	w.Write([]byte(fmt.Sprintf("%d", res)))
}
func (m *Module) isLikedBy(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	params := r.URL.Query()

	contentId, err := strconv.Atoi(params.Get("id"))
	if err != nil {
		http.Error(w, "invalid content id", http.StatusBadRequest)
		return
	}
	contentType, err := strconv.Atoi(params.Get("type"))
	if err != nil {
		http.Error(w, "invalid content type", http.StatusBadRequest)
		return
	}
	userId, err := strconv.Atoi(params.Get("user"))
	if err != nil {
		http.Error(w, "invalid user id", http.StatusBadRequest)
		return
	}

	var res int
	if err := m.g.DB.QueryRow(`SELECT COUNT(*) FROM grilist.likes WHERE content = $1 AND type = $2 AND "user" = $3`, contentId, contentType, userId).Scan(&res); err != nil {
		http.Error(w, "pq error", http.StatusInternalServerError)
		log.Printf("error getting like by user: %s", err)
		return
	}

	w.WriteHeader(200)
	w.Write([]byte(fmt.Sprintf("%t", res > 0)))
}
func (m *Module) addLike(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	params, err := readBody(r)
	if err != nil {
		log.Println(err)
		http.Error(w, "invalid body", http.StatusBadRequest)
		return
	}

	contentId, err := strconv.Atoi(params.Get("id"))
	if err != nil {
		log.Println(err)
		http.Error(w, "invalid content id", http.StatusBadRequest)
		return
	}
	contentType, err := strconv.Atoi(params.Get("type"))
	if err != nil {
		log.Println(err)
		http.Error(w, "invalid content type", http.StatusBadRequest)
		return
	}
	userId, err := strconv.Atoi(params.Get("user"))
	if err != nil {
		http.Error(w, "invalid user id", http.StatusBadRequest)
		return
	}

	_, err = m.g.DB.Exec(`INSERT INTO grilist.likes(content, "user", type) SELECT $1, $2, $3 WHERE NOT EXISTS (SELECT * FROM grilist.likes WHERE content = $1 AND "user" = $2 AND type = $3)`, contentId, userId, contentType)
	if err != nil {
		http.Error(w, "pq error", http.StatusInternalServerError)
		log.Printf("error add like: %s", err)
		return
	}

	w.WriteHeader(200)
}

func (m *Module) removeLike(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	params, err := readBody(r)
	if err != nil {
		http.Error(w, "invalid body", http.StatusBadRequest)
		return
	}

	contentId, err := strconv.Atoi(params.Get("id"))
	if err != nil {
		http.Error(w, "invalid content id", http.StatusBadRequest)
		return
	}
	contentType, err := strconv.Atoi(params.Get("type"))
	if err != nil {
		http.Error(w, "invalid content type", http.StatusBadRequest)
		return
	}
	userId, err := strconv.Atoi(params.Get("user"))
	if err != nil {
		http.Error(w, "invalid user id", http.StatusBadRequest)
		return
	}

	_, err = m.g.DB.Exec(`DELETE FROM grilist.likes WHERE content = $1 AND "user" = $2 AND type = $3`, contentId, userId, contentType)
	if err != nil {
		http.Error(w, "pq error", http.StatusInternalServerError)
		log.Printf("error add like: %s", err)
		return
	}

	w.WriteHeader(200)
}

func readBody(r *http.Request) (url.Values, error) {
	defer r.Body.Close()
	data, err := ioutil.ReadAll(r.Body)
	if err != nil {
		return nil, err
	}

	values, err := url.ParseQuery(string(data))
	if err != nil {
		return nil, err
	}

	return values, nil
}