package http

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

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

const (
	defaultDokterPerPage = 15
	maxDokterPerPage     = 100
)

type DokterPaginationResponse struct {
	CurrentPage  int                 `json:"current_page"`
	Data         []repository.Dokter `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) ListDokter(w http.ResponseWriter, r *http.Request) {
	page := parseDokterPage(r.URL.Query().Get("page"))
	perPage := parseDokterPerPage(r.URL.Query().Get("per_page"))

	doctorIDs := queryValues(r, "DokterID_in", "DokterID_in[]")
	doctorIDs = splitDoctorIDs(doctorIDs)

	result, err := h.dokterRepository(r.Context()).ListDokter(r.Context(), repository.DokterListParams{
		Search: strings.TrimSpace(r.URL.Query().Get("search")), DoctorIDs: doctorIDs,
		Page: page, PerPage: perPage,
	})
	if err != nil {
		WriteJSON(w, http.StatusInternalServerError, Response{Success: false, Message: "internal server error", Data: nil})
		return
	}

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

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

func parseDokterPage(raw string) int {
	value, err := strconv.Atoi(raw)
	if err != nil || value < 1 {
		return 1
	}
	return value
}

func parseDokterPerPage(raw string) int {
	value, err := strconv.Atoi(raw)
	if err != nil || value < 1 {
		return defaultDokterPerPage
	}
	if value > maxDokterPerPage {
		return maxDokterPerPage
	}
	return value
}

func splitDoctorIDs(values []string) []string {
	seen := make(map[string]struct{}, len(values))
	result := make([]string, 0, len(values))
	for _, value := range values {
		for _, part := range strings.Split(value, ",") {
			part = strings.TrimSpace(part)
			if part == "" {
				continue
			}
			if _, exists := seen[part]; exists {
				continue
			}
			seen[part] = struct{}{}
			result = append(result, part)
		}
	}
	return result
}