package http

import (
	"context"
	"log"
	"math"
	"net/http"
	"strconv"
	"strings"
	"time"

	"git.arav.su/Arav/dwelling-home/pkg/mindflow"
	"git.arav.su/Arav/dwelling-home/pkg/servicestat"
	"git.arav.su/Arav/dwelling-home/pkg/util"
	"git.arav.su/Arav/dwelling-home/web"
	"git.arav.su/Arav/justcaptcha/v2/dwcaptcha"
	"git.arav.su/Arav/justcaptcha/v2/inmemdb"
	"git.arav.su/Arav/justguestbook"
)

type Handlers struct {
	guestbookDB       justguestbook.Guestbook
	mindflowDB        mindflow.Mindflow
	captchaExpire     time.Duration
	owner             string
	guestbookPageSize int64
}

func NewHandlers(captchaExpire time.Duration, owner string, gbPageSize int64,
	gdb justguestbook.Guestbook, mdb mindflow.Mindflow) *Handlers {
	return &Handlers{
		guestbookDB:       gdb,
		mindflowDB:        mdb,
		captchaExpire:     captchaExpire,
		owner:             owner,
		guestbookPageSize: gbPageSize}
}

func (h *Handlers) Privacy(w http.ResponseWriter, r *http.Request) {
	web.Privacy(r).Render(context.Background(), w)
}

func (h *Handlers) Stuff(w http.ResponseWriter, r *http.Request) {
	web.Stuff(r).Render(context.Background(), w)
}

func (h *Handlers) Mindflow(w http.ResponseWriter, r *http.Request) {
	posts, err := h.mindflowDB.Posts()
	if err != nil {
		log.Println("Cannot load posts.", err)
		Error(w, http.StatusInternalServerError, "Cannot load posts.", "", r.Referer())
		return
	}

	categories, err := h.mindflowDB.Categories()
	if err != nil {
		log.Println("Cannot load categories.", err)
		Error(w, http.StatusInternalServerError, "Cannot load categories.", "", r.Referer())
		return
	}

	web.Mindflow(posts, categories, r).Render(context.Background(), w)
}

func (h *Handlers) MindflowAdmin(w http.ResponseWriter, r *http.Request) {
	posts, err := h.mindflowDB.Posts()
	if err != nil {
		Error(w, http.StatusInternalServerError, err.Error(), "failed to load posts", r.Referer())
		return
	}

	categories, err := h.mindflowDB.Categories()
	if err != nil {
		Error(w, http.StatusInternalServerError, err.Error(), "failed to load categories", r.Referer())
		return
	}

	web.MindflowAdmin(posts, categories, r).Render(context.Background(), w)
}

func (h *Handlers) About(w http.ResponseWriter, r *http.Request) {
	var lst servicestat.ServiceList = make(servicestat.ServiceList)
	reimu, err := servicestat.GatherStatus("http://reimu.arav.home.arpa:14882/processes")
	if err == nil {
		for k, v := range reimu {
			lst[k] = v
		}
	}
	sakuya, err := servicestat.GatherStatus("http://sakuya.arav.home.arpa:14882/processes")
	if err == nil {
		for k, v := range sakuya {
			lst[k] = v
		}
	}

	web.About(util.GetServiceByHost(r.Host, util.ServiceFiles), lst).Render(context.Background(), w)
}

func (h *Handlers) Article(w http.ResponseWriter, r *http.Request) {
	name := r.URL.Path[strings.LastIndex(r.URL.Path, "/")+1:]
	artcl := web.GetArticle(name)
	if artcl == nil {
		Error(w, http.StatusNotFound, "", "An article \""+name+"\" doesn't exist.", r.Referer())
		return
	}

	web.Article(artcl.Title, artcl.Description, string(artcl.Body), name, artcl.Date, r).Render(context.Background(), w)
}

func (h *Handlers) Guestbook(w http.ResponseWriter, r *http.Request) {
	var page int64
	var pageSize int64

	pageStr := r.URL.Query().Get("p")
	if pageStr != "" {
		page, _ = strconv.ParseInt(pageStr, 10, 64)
	} else {
		page = 1
	}

	pageSzStr := r.URL.Query().Get("ps")
	if pageSzStr != "" {
		pageSize, _ = strconv.ParseInt(pageSzStr, 10, 64)
	} else {
		pageSize = h.guestbookPageSize
	}

	entries, err := h.guestbookDB.Entries(page, pageSize)
	if err != nil {
		log.Println("failed to load gb entries:", err)
		return
	}

	for _, entry := range entries {
		entry.Message = strings.ReplaceAll(entry.Message, "\\n", "\n")
	}

	entriesCount, _ := h.guestbookDB.Count()
	pageCount := int64(math.Ceil(float64(entriesCount) / float64(h.guestbookPageSize)))

	dwc := dwcaptcha.NewDwellingCaptcha(h.captchaExpire)
	_, id := inmemdb.New(r.RemoteAddr, dwc)

	web.Guestbook(string(id), h.owner, entries, pageCount, r).Render(context.Background(), w)
}

func (h *Handlers) GuestbookAdmin(w http.ResponseWriter, r *http.Request) {
	entriesCount, _ := h.guestbookDB.Count()
	entries, err := h.guestbookDB.Entries(1, entriesCount)
	if err != nil {
		Error(w, http.StatusInternalServerError, err.Error(), "cannot load gb", r.Referer())
		return
	}
	for _, entry := range entries {
		entry.Message = strings.ReplaceAll(entry.Message, "\\n", "\n")
	}

	web.GuestbookAdmin(h.owner, entries, r).Render(context.Background(), w)
}

func (h *Handlers) RSS(w http.ResponseWriter, r *http.Request) {
	posts, err := h.mindflowDB.Posts()
	if err != nil {
		return
	}

	scheme := r.Header.Get("Scheme")
	if scheme == "" {
		scheme = "http"
	}

	web.RSS(scheme+"://"+r.Host, h.owner, posts, r).Render(context.Background(), w)
}

func ServeAsset(path string) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		data, _ := web.AssetsGetFile(path)
		w.Write(data)
	}
}

func Error(w http.ResponseWriter, code int, reason, message, referer string) {
	w.WriteHeader(code)
	web.ErrorXXX(code, reason, message, referer).Render(context.Background(), w)
}

func cleanupNewlines(text string) (out string) {
	out = strings.ReplaceAll(text, "\r\n", "\n")
	out = strings.ReplaceAll(out, "\n\r", "\n")
	return strings.ReplaceAll(out, "\r", "\n")
}