<template>
  <div>
    <div class="page-header">
      <h2>{{ isEdit ? 'Edit Part' : 'Add Part' }}</h2>
    </div>

    <div class="card form-card">
      <div v-if="error" class="error-message">{{ error }}</div>

      <form @submit.prevent="save">
        <div class="form-row">
          <div class="form-group">
            <label>Name *</label>
            <input v-model="form.itemname" type="text" class="form-control" required />
          </div>
          <div class="form-group">
            <label>Bin location</label>
            <input v-model="form.binlocation" type="text" class="form-control"
                   placeholder="e.g., Bin A3" />
          </div>
        </div>

        <div class="form-group">
          <label>Description</label>
          <input v-model="form.itemdescription" type="text" class="form-control"
                 maxlength="500" placeholder="Brief description shown on the storefront" />
        </div>

        <div class="form-row">
          <div class="form-group">
            <label>Low-stock threshold</label>
            <input v-model.number="form.lowstockthreshold" type="number" min="0"
                   class="form-control" />
          </div>
          <div v-if="isEdit" class="form-group">
            <label>Item code</label>
            <input :value="itemcode" type="text" class="form-control" disabled />
          </div>
        </div>

        <div class="form-group">
          <label>Print notes</label>
          <textarea v-model="form.printnotes" class="form-control" rows="3"
                    placeholder="Material, print time, slicer file path"></textarea>
        </div>

        <div v-if="isEdit" class="form-group">
          <label>Photo</label>
          <div class="image-row">
            <img v-if="imageurl" :src="withBase(imageurl)" class="image-preview" />
            <input type="file" accept="image/*" @change="onImagePicked" />
            <button v-if="imageurl" type="button" class="btn btn-secondary btn-sm"
                    @click="removeImage">Remove photo</button>
          </div>
        </div>
        <p v-else class="form-hint">Save first, then add a photo from the edit page.</p>

        <div class="form-actions">
          <button type="submit" class="btn btn-primary" :disabled="saving">
            {{ saving ? 'Saving...' : 'Save' }}
          </button>
          <router-link :to="cancelTarget" class="btn btn-secondary">Cancel</router-link>
        </div>
      </form>
    </div>
  </div>
</template>

<script setup>
import { ref, computed, onMounted } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { printedpartsApi } from '../../api'
import { withBase } from '../../utils/basePath'

const route = useRoute()
const router = useRouter()

const isEdit = computed(() => !!route.params.id)
const cancelTarget = computed(() =>
  isEdit.value ? `/printedparts/${route.params.id}` : '/printedparts')

const form = ref({
  itemname: '',
  itemdescription: '',
  lowstockthreshold: null,
  binlocation: '',
  printnotes: ''
})
const itemcode = ref('')
const imageurl = ref(null)
const saving = ref(false)
const error = ref('')

onMounted(async () => {
  if (!isEdit.value) return
  try {
    const response = await printedpartsApi.get(route.params.id)
    const item = response.data.data
    for (const key of Object.keys(form.value)) {
      form.value[key] = item[key]
    }
    itemcode.value = item.itemcode
    imageurl.value = item.imageurl
  } catch (loadError) {
    error.value = 'Could not load the item'
    console.error(loadError)
  }
})

async function save() {
  saving.value = true
  error.value = ''
  try {
    const payload = { ...form.value }
    if (payload.lowstockthreshold === null || payload.lowstockthreshold === '') {
      delete payload.lowstockthreshold
    }
    let printeditemid
    if (isEdit.value) {
      await printedpartsApi.update(route.params.id, payload)
      printeditemid = route.params.id
    } else {
      const response = await printedpartsApi.create(payload)
      printeditemid = response.data.data.printeditemid
    }
    router.push(`/printedparts/${printeditemid}`)
  } catch (saveError) {
    error.value = saveError.response?.data?.error?.message || 'Save failed'
  } finally {
    saving.value = false
  }
}

async function onImagePicked(event) {
  const file = event.target.files?.[0]
  if (!file) return
  try {
    const response = await printedpartsApi.uploadImage(route.params.id, file)
    imageurl.value = response.data.data.imageurl
  } catch (uploadError) {
    error.value = uploadError.response?.data?.error?.message || 'Image upload failed'
  }
}

async function removeImage() {
  try {
    await printedpartsApi.deleteImage(route.params.id)
    imageurl.value = null
  } catch (deleteError) {
    error.value = 'Could not remove the image'
    console.error(deleteError)
  }
}
</script>

<style scoped>
.image-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.image-preview {
  width: 6rem;
  height: 6rem;
  object-fit: cover;
  border-radius: 0.35rem;
  border: 1px solid var(--border);
}
.form-hint { color: var(--text-light); }
</style>
