<script setup>
import { ref, computed } from "vue";
import { ChevronLeft, ChevronRight, ChevronsLeft, ChevronsRight } from "lucide-vue-next";
import {
  Pagination,
  PaginationContent,
  PaginationEllipsis,
  PaginationFirst,
  PaginationItem,
  PaginationLast,
  PaginationNext,
  PaginationPrevious,
} from "@/Components/ui/pagination";
import { Separator } from "@/Components/ui/separator";

const props = defineProps({
  currentPage: { type: Number, required: true },
  lastPage: { type: Number, required: true },
  total: { type: Number, required: true },
  showingFrom: { type: Number, required: true },
  showingTo: { type: Number, required: true },
  showPageStats: { type: Boolean, default: true },
  showGoto: { type: Boolean, default: true },
  maxPageLinks: { type: Number, default: 5 },
  perPage: { type: Number, default: 10 },
});

const emit = defineEmits(["update:page"]);

const gotoInput = ref("");

function goToPageInput() {
  const raw = String(gotoInput.value || "").trim();
  const n = Number(raw);
  if (!Number.isFinite(n)) return;
  const target = Math.max(1, Math.min(props.lastPage, Math.floor(n)));
  if (target !== props.currentPage) setPage(target);
  gotoInput.value = "";
}

const visiblePages = computed(() => {
  const pages = [];
  const count = props.lastPage;
  if (count <= 1) return [1];
  const windowSize = Math.max(3, props.maxPageLinks);
  const half = Math.floor(windowSize / 2);
  let start = Math.max(1, props.currentPage - half);
  let end = Math.min(count, start + windowSize - 1);
  start = Math.max(1, Math.min(start, end - windowSize + 1));

  // Handle first page
  if (start > 1) {
    pages.push(1);
    if (start > 2) pages.push("...");
  }

  // Add pages in window
  for (let i = start; i <= end; i++) {
    pages.push(i);
  }

  // Handle last page
  if (end < count) {
    if (end < count - 1) pages.push("...");
    pages.push(count);
  }

  return pages;
});

function setPage(p) {
  emit("update:page", Math.min(Math.max(1, p), props.lastPage));
}
</script>

<template>
  <nav
    class="flex flex-wrap items-center justify-between gap-3 px-2 text-sm text-gray-700 sm:px-1"
    aria-label="Pagination"
  >
    <!-- Mobile: Simple prev/next -->
    <div class="flex flex-1 justify-between sm:hidden">
      <button
        @click="setPage(currentPage - 1)"
        :disabled="currentPage <= 1"
        class="relative inline-flex items-center rounded-md border border-gray-300 bg-white px-4 py-2 text-sm font-medium text-gray-700 hover:bg-gray-50 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
      >
        Prejšnja
      </button>
      <button
        @click="setPage(currentPage + 1)"
        :disabled="currentPage >= lastPage"
        class="relative ml-3 inline-flex items-center rounded-md border border-gray-300 bg-white px-4 py-2 text-sm font-medium text-gray-700 hover:bg-gray-50 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
      >
        Naslednja
      </button>
    </div>

    <!-- Desktop: Full pagination -->
    <div class="hidden sm:flex sm:flex-1 sm:items-center sm:justify-between">
      <!-- Page stats with modern badge style -->
      <div v-if="showPageStats">
        <div v-if="total > 0" class="flex items-center gap-2">
          <span class="text-sm text-muted-foreground">Prikazano</span>
          <div
            class="inline-flex items-center gap-1 rounded-md bg-muted px-2 py-1 text-sm font-medium"
          >
            <span class="text-foreground">{{ showingFrom }}</span>
            <span class="text-muted-foreground">-</span>
            <span class="text-foreground">{{ showingTo }}</span>
          </div>
          <span class="text-sm text-muted-foreground">od</span>
          <div
            class="inline-flex items-center rounded-md bg-primary/10 px-2.5 py-1 text-sm font-semibold text-primary"
          >
            {{ total }}
          </div>
        </div>
        <div
          v-else
          class="inline-flex items-center gap-2 rounded-lg bg-muted/50 px-3 py-1.5"
        >
          <span class="text-sm font-medium text-muted-foreground">Ni zadetkov</span>
        </div>
      </div>

      <!-- Pagination controls -->
      <Pagination
        v-slot="{ page }"
        :total="total"
        :items-per-page="perPage"
        :sibling-count="1"
        show-edges
        :default-page="currentPage"
        :page="currentPage"
      >
        <PaginationContent>
          <!-- First -->
          <PaginationFirst :disabled="currentPage <= 1" @click="setPage(1)">
            <ChevronsLeft />
          </PaginationFirst>

          <!-- Previous -->
          <PaginationPrevious
            :disabled="currentPage <= 1"
            @click="setPage(currentPage - 1)"
          >
            <ChevronLeft />
          </PaginationPrevious>

          <!-- Page numbers -->
          <template v-for="(item, index) in visiblePages" :key="index">
            <PaginationEllipsis v-if="item === '...'" />
            <PaginationItem
              v-else
              :value="item"
              :is-active="currentPage === item"
              @click="setPage(item)"
            >
              {{ item }}
            </PaginationItem>
          </template>

          <!-- Next -->
          <PaginationNext
            :disabled="currentPage >= lastPage"
            @click="setPage(currentPage + 1)"
          >
            <ChevronRight />
          </PaginationNext>

          <!-- Last -->
          <PaginationLast
            :disabled="currentPage >= lastPage"
            @click="setPage(lastPage)"
          >
            <ChevronsRight />
          </PaginationLast>
        </PaginationContent>
      </Pagination>

      <!-- Goto page input -->
      <div v-if="showGoto" class="flex items-center gap-3">
        <div
          class="inline-flex items-center gap-2 rounded-md border border-input bg-background px-2 h-8"
        >
          <input
            v-model="gotoInput"
            type="number"
            min="1"
            :max="lastPage"
            inputmode="numeric"
            class="w-10 h-full text-sm text-center bg-transparent border-0 outline-none focus:outline-none [appearance:textfield] [&::-webkit-outer-spin-button]:appearance-none [&::-webkit-inner-spin-button]:appearance-none"
            :placeholder="String(currentPage)"
            aria-label="Pojdi na stran"
            @keyup.enter="goToPageInput"
            @blur="goToPageInput"
          />
          <Separator orientation="vertical" class="h-full" />
          <span class="text-sm text-muted-foreground">{{ lastPage }}</span>
        </div>
      </div>
    </div>
  </nav>
</template>
