<script setup>
import AppLayout from "@/Layouts/AppLayout.vue";
import { useForm, router } from "@inertiajs/vue3";
import { ref, computed } from "vue";
import axios from "axios";
import { Button } from "@/Components/ui/button";
import { Label } from "@/Components/ui/label";
import { Checkbox } from "@/Components/ui/checkbox";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/Components/ui/select";

const props = defineProps({
  templates: Array,
  clients: Array,
});

const form = useForm({
  client_uuid: null,
  import_template_id: null,
  has_header: true,
  file: null,
});

// Filter templates: show globals when no client; when client selected show only that client's templates
const filteredTemplates = computed(() => {
  if (!form.client_uuid) {
    return props.templates.filter((t) => !t.client_id);
  }
  return props.templates.filter((t) => t.client_uuid === form.client_uuid || !t.client_id);
});

const uploading = ref(false);
const dragActive = ref(false);
const uploadError = ref(null);

function onFileChange(e) {
  const files = e.target.files;
  if (files?.length) {
    form.file = files[0];
    uploadError.value = null;
  }
}

function onFileDrop(e) {
  const files = e.dataTransfer?.files;
  if (files?.length) {
    form.file = files[0];
    uploadError.value = null;
  }
  dragActive.value = false;
}

function clearFile() {
  form.file = null;
  uploadError.value = null;
}

async function startImport() {
  uploadError.value = null;
  if (!form.file) {
    uploadError.value = "Najprej izberite datoteko.";
    return;
  }
  
  uploading.value = true;
  try {
    const fd = new FormData();
    fd.append("file", form.file);
    if (form.import_template_id) {
      fd.append("import_template_id", String(form.import_template_id));
    }
    if (form.client_uuid) {
      fd.append("client_uuid", form.client_uuid);
    }
    fd.append("has_header", form.has_header ? "1" : "0");
    
    const { data } = await axios.post(route("imports.store"), fd, {
      headers: { Accept: "application/json" },
      withCredentials: true,
    });
    
    if (data?.uuid) {
      router.visit(route("imports.continue", { import: data.uuid }));
    } else if (data?.id) {
      router.visit(route("imports.continue", { import: data.id }));
    } else {
      uploadError.value = "Nepričakovan odgovor strežnika.";
    }
  } catch (e) {
    uploadError.value = e.response?.data?.message || "Nalaganje ni uspelo.";
    console.error("Import upload failed", e.response?.status, e.response?.data || e);
  } finally {
    uploading.value = false;
  }
}
</script>

<template>
  <AppLayout title="Nov uvoz">
    <template #header>
      <h2 class="text-xl font-semibold leading-tight text-gray-800">Nov uvoz</h2>
    </template>

    <div class="py-6">
      <div class="mx-auto max-w-4xl sm:px-6 lg:px-8">
        <div class="space-y-8 rounded-lg bg-white p-6 shadow sm:rounded-lg">
          <!-- Intro -->
          <div class="text-sm leading-relaxed text-gray-600">
            <p class="mb-2">
              1) Izberite stranko (opcijsko) in predlogo (če obstaja), 2) izberite
              datoteko (CSV, TXT, XLSX*) in 3) kliknite Začni uvoz. Nadaljnje preslikave
              in simulacija bodo na naslednji strani.
            </p>
            <p class="text-xs text-gray-500">
              * XLSX podpora je odvisna od konfiguracije strežnika.
            </p>
          </div>

          <!-- Client & Template selection -->
          <div class="grid grid-cols-1 gap-6 md:grid-cols-2">
            <!-- Client Select -->
            <div class="space-y-2">
              <Label>Stranka</Label>
              <Select v-model="form.client_uuid">
                <SelectTrigger>
                  <SelectValue placeholder="Izberite stranko..." />
                </SelectTrigger>
                <SelectContent>
                  <SelectGroup>
                    <SelectItem
                      v-for="client in clients"
                      :key="client.uuid"
                      :value="client.uuid"
                    >
                      {{ client.name }}
                    </SelectItem>
                  </SelectGroup>
                </SelectContent>
              </Select>
              <p class="text-xs text-gray-500">
                Če stranka ni izbrana, bo uvoz globalen.
              </p>
            </div>

            <!-- Template Select -->
            <div class="space-y-2">
              <Label>Predloga</Label>
              <Select v-model="form.import_template_id">
                <SelectTrigger>
                  <SelectValue placeholder="Izberite predlogo..." />
                </SelectTrigger>
                <SelectContent>
                  <SelectGroup>
                    <SelectItem
                      v-for="template in filteredTemplates"
                      :key="template.id"
                      :value="template.id"
                    >
                      <div class="flex w-full items-center justify-between">
                        <span class="truncate">{{ template.name }}</span>
                        <span
                          class="ml-2 rounded bg-gray-100 px-1.5 py-0.5 text-[10px] text-gray-600"
                        >
                          {{ template.client_id ? "Client" : "Global" }}
                        </span>
                      </div>
                    </SelectItem>
                  </SelectGroup>
                </SelectContent>
              </Select>
              <p v-if="!form.client_uuid" class="mt-1 text-xs text-gray-500">
                Prikazane so samo globalne predloge dokler ne izberete stranke.
              </p>
            </div>
          </div>

          <!-- File Upload -->
          <div class="space-y-4">
            <Label>Datoteka</Label>
            <div
              class="cursor-pointer rounded-md border-2 border-dashed p-6 text-center transition-colors"
              :class="{
                'border-indigo-400 bg-indigo-50': dragActive,
                'border-gray-300 hover:border-gray-400': !dragActive,
              }"
              @dragover.prevent="dragActive = true"
              @dragleave.prevent="dragActive = false"
              @drop.prevent="onFileDrop"
            >
              <input
                id="import-file-input"
                type="file"
                class="hidden"
                @change="onFileChange"
              />
              <label for="import-file-input" class="block cursor-pointer select-none">
                <div v-if="!form.file" class="text-sm text-gray-600">
                  Povlecite datoteko sem ali
                  <span class="text-indigo-600 underline">kliknite za izbiro</span>
                </div>
                <div v-else class="flex flex-col gap-1 text-sm text-gray-800">
                  <span class="font-medium">{{ form.file.name }}</span>
                  <span class="text-xs text-gray-500">
                    {{ (form.file.size / 1024).toFixed(1) }} kB
                  </span>
                  <span class="inline-block rounded bg-gray-100 px-1.5 py-0.5 text-[10px]">
                    Zamenjaj
                  </span>
                </div>
              </label>
            </div>

            <!-- Has Header Checkbox -->
            <div class="flex items-center space-x-2">
              <Checkbox id="has-header" v-model:checked="form.has_header" />
              <Label
                for="has-header"
                class="cursor-pointer text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70"
              >
                Prva vrstica je glava
              </Label>
            </div>
            <p class="text-xs leading-relaxed text-gray-500">
              Če ni označeno, bodo stolpci poimenovani po zaporedju (A, B, C ...).
            </p>
          </div>

          <!-- Error Message -->
          <div v-if="uploadError" class="rounded-md bg-red-50 p-3 text-sm text-red-600">
            {{ uploadError }}
          </div>

          <!-- Actions -->
          <div class="flex flex-wrap justify-end gap-3 border-t pt-4">
            <Button
              variant="outline"
              :disabled="uploading || !form.file"
              @click="clearFile"
            >
              Počisti
            </Button>
            <Button :disabled="uploading" @click="startImport">
              <span
                v-if="uploading"
                class="mr-2 h-4 w-4 animate-spin rounded-full border-2 border-white/60 border-t-transparent"
              />
              {{ uploading ? "Nalagam..." : "Začni uvoz" }}
            </Button>
          </div>

          <div class="border-t pt-4 text-xs text-gray-400">
            Po nalaganju boste preusmerjeni na nadaljevanje uvoza, kjer lahko izvedete
            preslikave, simulacijo in končno obdelavo.
          </div>
        </div>
      </div>
    </div>
  </AppLayout>
</template>
