<template>
    <Teleport to="body">
        <Transition name="fade" appear>
            <div
                v-if="document"
                class="fixed inset-0 z-[60] flex items-center justify-center bg-black/80"
                @click.self="$emit('close')"
                @keydown.escape="$emit('close')"
                @keydown.left="$emit('prev')"
                @keydown.right="$emit('next')"
                tabindex="0"
                ref="overlayRef"
            >
                <!-- Close button -->
                <button
                    class="absolute right-4 top-4 rounded-full bg-black/50 p-2 text-white transition-colors hover:bg-black/70"
                    @click="$emit('close')"
                >
                    <Icon name="heroicons:x-mark" class="h-6 w-6" />
                </button>

                <!-- Navigation arrows -->
                <button
                    v-if="hasPrev"
                    class="absolute left-4 top-1/2 -translate-y-1/2 rounded-full bg-black/50 p-2 text-white transition-colors hover:bg-black/70"
                    @click="$emit('prev')"
                >
                    <Icon name="heroicons:chevron-left" class="h-6 w-6" />
                </button>
                <button
                    v-if="hasNext"
                    class="absolute right-4 top-1/2 -translate-y-1/2 rounded-full bg-black/50 p-2 text-white transition-colors hover:bg-black/70"
                    @click="$emit('next')"
                >
                    <Icon name="heroicons:chevron-right" class="h-6 w-6" />
                </button>

                <!-- Content -->
                <div class="flex max-h-[90vh] max-w-[90vw] flex-col items-center">
                    <!-- Image preview -->
                    <img
                        v-if="isImage"
                        :src="downloadUrl"
                        :alt="document.originalName"
                        class="max-h-[85vh] max-w-[90vw] object-contain"
                    />

                    <!-- PDF preview -->
                    <iframe
                        v-else-if="isPdf"
                        :src="downloadUrl"
                        class="h-[85vh] w-[80vw] rounded-lg bg-white"
                    />

                    <!-- Generic file -->
                    <div v-else class="flex flex-col items-center gap-4 rounded-xl bg-white p-10">
                        <Icon name="heroicons:document" class="h-16 w-16 text-neutral-400" />
                        <p class="max-w-xs truncate text-lg font-medium text-neutral-700">{{ document.originalName }}</p>
                        <p class="text-sm text-neutral-400">{{ formatFileSize(document.size) }}</p>
                        <a
                            :href="downloadUrl"
                            download
                            class="mt-2 rounded-lg bg-blue-600 px-6 py-2 text-sm font-semibold text-white transition-colors hover:bg-blue-700"
                        >
                            {{ $t('taskDocuments.download') }}
                        </a>
                    </div>

                    <!-- File name footer -->
                    <p class="mt-3 text-sm text-white/70">{{ document.originalName }}</p>
                </div>
            </div>
        </Transition>
    </Teleport>
</template>

<script setup lang="ts">
import type { TaskDocument } from '~/services/dto/task-document'
import { useTaskDocumentService } from '~/services/task-documents'
import { formatFileSize } from '~/utils/format'

const props = defineProps<{
    document: TaskDocument | null
    hasPrev: boolean
    hasNext: boolean
}>()

defineEmits<{
    close: []
    prev: []
    next: []
}>()

const overlayRef = ref<HTMLElement | null>(null)

const { getDownloadUrl } = useTaskDocumentService()

const downloadUrl = computed(() => props.document ? getDownloadUrl(props.document.id) : '')
const isImage = computed(() => props.document?.mimeType.startsWith('image/') ?? false)
const isPdf = computed(() => props.document?.mimeType === 'application/pdf')

// Focus overlay for keyboard events
watch(() => props.document, (doc) => {
    if (doc) {
        nextTick(() => overlayRef.value?.focus())
    }
})
</script>

<style scoped>
.fade-enter-active,
.fade-leave-active {
    transition: opacity 0.2s ease;
}
.fade-enter-from,
.fade-leave-to {
    opacity: 0;
}
</style>
