package http

import (
	"net/http"
	"strconv"
	"strings"

	"primaya-api/cpone-middleware/internal/repository"
)

const (
	defaultLayananPerPage = 15
	maxLayananPerPage     = 1000
)

type LayananPaginationResponse struct {
	CurrentPage  int                            `json:"current_page"`
	Data         []repository.LayananDepartemen `json:"data"`
	FirstPageURL string                         `json:"first_page_url"`
	From         *int                           `json:"from"`
	LastPage     int                            `json:"last_page"`
	LastPageURL  string                         `json:"last_page_url"`
	Links        map[string]any                 `json:"links"`
	NextPageURL  *string                        `json:"next_page_url"`
	Total        int                            `json:"total"`
	PerPage      int                            `json:"per_page"`
}

func (h Handler) ListLayanan(w http.ResponseWriter, r *http.Request) {
	pageNumber := layananPageNumber(r)
	perPage := layananPageSize(r)
	search := strings.TrimSpace(r.URL.Query().Get("search"))
	departemenID := strings.TrimSpace(r.URL.Query().Get("departemen_id"))
	page, err := h.layananRepository(r.Context()).ListLayanan(r.Context(), repository.LayananListParams{
		Page: pageNumber, PerPage: perPage, Search: search, DepartemenID: departemenID,
	})
	if err != nil {
		WriteJSON(w, http.StatusInternalServerError, Response{
			Success: false, Message: "internal server error", Data: nil,
		})
		return
	}

	lastPage := (page.Total + perPage - 1) / perPage
	if lastPage < 1 {
		lastPage = 1
	}
	var from *int
	if len(page.Items) > 0 {
		value := (pageNumber-1)*perPage + 1
		from = &value
	}
	var nextPageURL *string
	if pageNumber < lastPage {
		value := currentRequestURL(r, pageNumber+1)
		nextPageURL = &value
	}

	WriteJSON(w, http.StatusOK, LayananPaginationResponse{
		CurrentPage: pageNumber, Data: page.Items, FirstPageURL: "", From: from,
		LastPage: lastPage, LastPageURL: "", Links: map[string]any{},
		NextPageURL: nextPageURL, Total: page.Total, PerPage: perPage,
	})
}

func layananPageSize(r *http.Request) int {
	perPage, err := strconv.Atoi(r.URL.Query().Get("per_page"))
	if err != nil || perPage < 1 {
		return defaultLayananPerPage
	}
	if perPage > maxLayananPerPage {
		return maxLayananPerPage
	}
	return perPage
}

func layananPageNumber(r *http.Request) int {
	page, err := strconv.Atoi(r.URL.Query().Get("page"))
	if err != nil || page < 1 {
		return 1
	}
	return page
}