package site

import (
	"net/http"
	"net/netip"
	"server/internal/model/common"
	"server/internal/pkg/errs"
	"server/internal/pkg/httputil"
	"server/internal/router"
	"server/internal/service/web"

	"github.com/go-chi/chi/v5"
)

var _ router.Registrar = (*PostHandler)(nil)

type PostHandler struct {
	postService *web.PostService
}

func (h *PostHandler) Register(r chi.Router) {
	r.Get("/posts", h.ListPage)
	r.Get("/posts/{slug}", h.GetPost)
	r.Get("/categories/stats", h.ListCategoryStats)
	r.Get("/posts/archives", h.ListArchives)
	r.Get("/posts/tags", h.ListPostTags)
}

func NewPostHandler(postService *web.PostService) *PostHandler {
	return &PostHandler{postService: postService}
}

func (h *PostHandler) ListPage(w http.ResponseWriter, r *http.Request) {
	pagination := httputil.Pagination(r)

	result, err := h.postService.ListPage(r.Context(), pagination)
	if err != nil {
		httputil.Fail(w, err)
		return
	}

	resp := common.PageResponse{
		Page:     pagination.Page,
		PageSize: pagination.PageSize,
		List:     result.List,
		Total:    result.Total,
	}

	httputil.OkWithPage(w, &resp)
}

func (h *PostHandler) GetPost(w http.ResponseWriter, r *http.Request) {
	slug := chi.URLParam(r, "slug")

	if slug == "" {
		httputil.Fail(w, errs.ErrSlugRequired)
		return
	}

	ip, err := netip.ParseAddr(httputil.ClientIP(r))
	if err != nil {
		httputil.Fail(w, err)
		return
	}

	post, err := h.postService.GetPost(r.Context(), slug, ip)
	if err != nil {
		httputil.Fail(w, err)
		return
	}

	httputil.Ok(w, post)
}

func (h *PostHandler) ListCategoryStats(w http.ResponseWriter, r *http.Request) {
	list, err := h.postService.ListCategoryStats(r.Context())
	if err != nil {
		httputil.Fail(w, err)
		return
	}

	httputil.Ok(w, list)
}

func (h *PostHandler) ListArchives(w http.ResponseWriter, r *http.Request) {
	list, err := h.postService.ListArchives(r.Context())
	if err != nil {
		httputil.Fail(w, err)
		return
	}

	httputil.Ok(w, list)
}

func (h *PostHandler) ListPostTags(w http.ResponseWriter, r *http.Request) {
	list, err := h.postService.ListPostTags(r.Context())
	if err != nil {
		httputil.Fail(w, err)
		return
	}

	httputil.Ok(w, list)
}