<template>
    <div
        class="relative mt-4 rounded-lg border-2 border-dashed transition-colors"
        :class="isDragging ? 'border-blue-400 bg-blue-50' : 'border-neutral-300 hover:border-neutral-400'"
        @dragover.prevent="isDragging = true"
        @dragleave.prevent="isDragging = false"
        @drop.prevent="handleDrop"
        @click="fileInput?.click()"
    >
        <input
            ref="fileInput"
            type="file"
            multiple
            class="hidden"
            @change="handleFileSelect"
        />

        <div class="flex cursor-pointer flex-col items-center gap-2 px-4 py-6 text-center">
            <Icon name="heroicons:cloud-arrow-up" class="h-8 w-8 text-neutral-400" />
            <p class="text-sm text-neutral-500">{{ $t('taskDocuments.dropzone') }}</p>
        </div>

        <!-- Upload progress -->
        <div v-if="uploads.length" class="space-y-2 border-t border-neutral-200 px-4 py-3">
            <div v-for="upload in uploads" :key="upload.name" class="flex items-center gap-3">
                <div class="min-w-0 flex-1">
                    <p class="truncate text-sm text-neutral-700">{{ upload.name }}</p>
                    <div class="mt-1 h-1.5 w-full overflow-hidden rounded-full bg-neutral-200">
                        <div
                            class="h-full rounded-full transition-all"
                            :class="[
                                upload.error ? 'bg-red-500' : upload.uploading ? 'animate-pulse bg-blue-400' : 'bg-green-500',
                            ]"
                            :style="{ width: upload.uploading ? '70%' : `${upload.progress}%` }"
                        />
                    </div>
                </div>
                <Icon
                    v-if="upload.error"
                    name="heroicons:exclamation-circle"
                    class="h-5 w-5 shrink-0 text-red-500"
                />
            </div>
        </div>
    </div>
</template>

<script setup lang="ts">
import { useTaskDocumentService } from '~/modules/project-management/services/task-documents'

const props = defineProps<{
    taskId?: number
}>()

const emit = defineEmits<{
    uploaded: []
}>()

const { upload: uploadFile } = useTaskDocumentService()
const toast = useToast()
const { t } = useI18n()

const fileInput = ref<HTMLInputElement | null>(null)
const isDragging = ref(false)

type UploadState = {
    name: string
    progress: number
    uploading: boolean
    error: boolean
}

const uploads = ref<UploadState[]>([])

function handleDrop(event: DragEvent) {
    isDragging.value = false
    const files = event.dataTransfer?.files
    if (files?.length) {
        processFiles(Array.from(files))
    }
}

function handleFileSelect(event: Event) {
    const input = event.target as HTMLInputElement
    if (input.files?.length) {
        processFiles(Array.from(input.files))
        input.value = ''
    }
}

async function processFiles(files: File[]) {
    const maxSize = 50 * 1024 * 1024

    for (const file of files) {
        if (file.size > maxSize) {
            toast.error({
                title: 'Erreur',
                message: t('taskDocuments.maxSizeError'),
            })
            continue
        }

        const state: UploadState = reactive({
            name: file.name,
            progress: 30,
            uploading: true,
            error: false,
        })
        uploads.value.push(state)

        try {
            if (props.taskId) {
                await uploadFile(props.taskId, file)
            }
            state.uploading = false
            state.progress = 100
        } catch {
            state.uploading = false
            state.error = true
            state.progress = 100
            toast.error({
                title: 'Erreur',
                message: t('taskDocuments.uploadError'),
            })
        }

        emit('uploaded')
    }

    // Clean up completed uploads after a delay
    setTimeout(() => {
        uploads.value = uploads.value.filter(u => u.error)
    }, 1500)
}
</script>
