package handlers

import (
	"encoding/json"
	"net/http"
	"strconv"

	"server/database"
	"server/helper"
)

type postsResponse struct {
	Posts []database.Post `json:"posts"`
}

func Posts(writer http.ResponseWriter, request *http.Request) {
	if request.Method != "GET" {
		helper.WriteErrorJson("expected GET method", writer, http.StatusBadRequest)
		return
	}

	page, err := strconv.Atoi(request.URL.Query().Get("page"))
	if err != nil {
		helper.WriteErrorJson("expected page parameter", writer, http.StatusBadRequest)
		return
	}
	if page < 0 {
		helper.WriteErrorJson("expected page parameter >= 0", writer, http.StatusBadRequest)
		return
	}

	amount, err := strconv.Atoi(request.URL.Query().Get("amount"))
	if err != nil {
		helper.WriteErrorJson("expected amount parameter", writer, http.StatusBadRequest)
		return
	}
	if amount <= 0 {
		helper.WriteErrorJson("expected amount parameter > 0", writer, http.StatusBadRequest)
		return
	}

	subreact := request.URL.Query().Get("subreact")
	if !helper.IsValidSubreact(subreact, writer) {
		return
	}

	posts, err := database.GetPosts(subreact, page, amount)
	if err != nil {
		helper.WriteInternalErrorJson(err, writer)
		return
	}

	resp, err := json.Marshal(postsResponse{Posts: posts})
	if err != nil {
		helper.WriteInternalErrorJson(err, writer)
		return
	}

	writer.Write(resp)
}