package handlers

import (
	"encoding/json"
	"fmt"
	"justguestbook/internal/guestbook"
	"justguestbook/pkg/justcaptcha"
	"justguestbook/pkg/server"
	"log"
	"net/http"
	"strconv"
	"strings"
)

type GuestbookHandlers struct {
	owner           string
	password        string
	anonymousName   string
	defaultPageSize int64
	db              guestbook.Guestbook
	captchaAddr     string
}

func New(owner, password, anonymousName string, defaultPageSize int64, guestbook guestbook.Guestbook, captchaAddr string) *GuestbookHandlers {
	return &GuestbookHandlers{
		owner:           owner,
		password:        password,
		anonymousName:   anonymousName,
		defaultPageSize: defaultPageSize,
		db:              guestbook,
		captchaAddr:     captchaAddr}
}

func (h *GuestbookHandlers) Entries(w http.ResponseWriter, r *http.Request) {
	var err error

	var page_num int64 = 1
	if r.URL.Query().Get("p") != "" {
		page_num, err = strconv.ParseInt(r.URL.Query().Get("p"), 10, 64)
		if err != nil {
			page_num = 1
		}
	}

	var page_size int64 = h.defaultPageSize
	if r.URL.Query().Get("ps") != "" {
		page_size, err = strconv.ParseInt(r.URL.Query().Get("ps"), 10, 64)
		if err != nil {
			page_size = h.defaultPageSize
		}
	}

	entries, err := h.db.Entries(page_num, page_size)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		log.Println("failed to retrieve entries:", err)
		return
	}

	guestbookEntries := struct {
		Owner   string             `json:"owner"`
		Entries []*guestbook.Entry `json:"entries"`
	}{
		Owner:   h.owner,
		Entries: entries}

	w.Header().Add("Content-Type", "application/json")
	if err := json.NewEncoder(w).Encode(&guestbookEntries); err != nil {
		log.Println("failed to encode entries:", err)
		http.Error(w, fmt.Sprintln("failed to encode entries:", err.Error()), http.StatusInternalServerError)
	}
}

func (h *GuestbookHandlers) New(w http.ResponseWriter, r *http.Request) {
	var entry *guestbook.Entry
	var err error

	if r.Header.Get("Content-Type") == "application/x-www-form-urlencoded" {
		r.ParseForm()

		if r.FormValue("captcha_id") == "" {
			w.WriteHeader(http.StatusForbidden)
			return
		}

		solved, err := justcaptcha.CheckCaptcha(r.FormValue("captcha_id"), h.captchaAddr)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			log.Println("justcaptcha:", err)
			return
		}

		if !solved {
			w.WriteHeader(http.StatusForbidden)
			return
		}

		name := r.FormValue("name")
		if name == "" {
			name = h.anonymousName
		}

		entry, err = guestbook.NewEntry(name, r.FormValue("message"),
			r.FormValue("website"), len(r.FormValue("hide_website")) != 0)
		if err != nil {
			http.Error(w, err.Error(), http.StatusUnprocessableEntity)
			return
		}
	} else if r.Header.Get("Content-Type") == "application/json" {
		cid := struct {
			CaptchaID string `json:"captcha_id"`
		}{}
		if err := json.NewDecoder(r.Body).Decode(&cid); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		solved, err := justcaptcha.CheckCaptcha(cid.CaptchaID, h.captchaAddr)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			log.Println("justcaptcha:", err)
			return
		}

		if !solved {
			w.WriteHeader(http.StatusForbidden)
			return
		}

		if err := json.NewDecoder(r.Body).Decode(entry); err != nil {
			http.Error(w, err.Error(), http.StatusUnprocessableEntity)
			return
		}
	}

	err = h.db.NewEntry(entry)
	if err != nil {
		http.Error(w, entry.Message, http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusCreated)
}

func (h *GuestbookHandlers) Reply(w http.ResponseWriter, r *http.Request) {
	var reply *guestbook.Reply

	if r.Header.Get("X-Password") != h.password {
		w.WriteHeader(http.StatusForbidden)
		return
	}

	id, err := strconv.ParseInt(server.GetURLParam(r, "entry"), 10, 64)
	if err != nil {
		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
		return
	}

	if r.Header.Get("Content-Type") == "application/x-www-form-urlencoded" {
		r.ParseForm()

		reply, err = guestbook.NewReply(id, r.FormValue("reply"))
		if err != nil {
			http.Error(w, err.Error(), http.StatusUnprocessableEntity)
			return
		}
	} else if r.Header.Get("Content-Type") == "application/json" {
		if err := json.NewDecoder(r.Body).Decode(reply); err != nil {
			http.Error(w, err.Error(), http.StatusUnprocessableEntity)
			return
		}
	}

	if err := h.db.NewReply(reply); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusCreated)
}

func (h *GuestbookHandlers) Update(w http.ResponseWriter, r *http.Request) {
	if r.Header.Get("X-Password") != h.password {
		w.WriteHeader(http.StatusForbidden)
		return
	}

	entryID, err := strconv.ParseInt(server.GetURLParam(r, "entry"), 10, 64)
	if err != nil {
		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
		return
	}

	if strings.HasSuffix(r.URL.Path, "reply") {
		rp := guestbook.Reply{}
		json.NewDecoder(r.Body).Decode(&rp)

		isCreated, err := h.db.UpdateReply(entryID, &rp)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if isCreated {
			w.WriteHeader(http.StatusCreated)
		}

		w.Header().Add("Content-Type", "application/json")
		json.NewEncoder(w).Encode(&rp)
	} else {
		et := guestbook.Entry{}
		json.NewDecoder(r.Body).Decode(&et)

		isCreated, err := h.db.UpdateEntry(entryID, &et)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if isCreated {
			w.WriteHeader(http.StatusCreated)
		}

		w.Header().Add("Content-Type", "application/json")
		json.NewEncoder(w).Encode(&et)
	}
}

func (h *GuestbookHandlers) Delete(w http.ResponseWriter, r *http.Request) {
	if r.Header.Get("X-Password") != h.password {
		w.WriteHeader(http.StatusForbidden)
		return
	}

	entryID, err := strconv.ParseInt(server.GetURLParam(r, "entry"), 10, 64)
	if err != nil {
		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
		return
	}

	if strings.HasSuffix(r.URL.Path, "reply") {
		if err := h.db.DeleteReply(entryID); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	} else {
		if err := h.db.DeleteEntry(entryID); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	}
}