<template>
    <div
        aria-label="File Upload Modal"
        class="relative h-full flex flex-col bg-white shadow-xl rounded-md"
        v-on:dragenter="dragEnterHandler"
        v-on:dragleave="dragLeaveHandler"
        v-on:dragover="dragOverHandler"
        v-on:drop="dropHandler"
    >
        <!-- ondrop="dropHandler(event);"
        ondragover="dragOverHandler(event);"
        ondragleave="dragLeaveHandler(event);"
        ondragenter="dragEnterHandler(event);" -->

        <!-- overlay -->
        <div
            id="overlay"
            ref="overlay"
            class="w-full h-full absolute top-0 left-0 pointer-events-none z-50 flex flex-col items-center justify-center rounded-md"
        >
            <i>
                <svg
                    class="fill-current w-12 h-12 mb-3 text-blue-700"
                    xmlns="http://www.w3.org/2000/svg"
                    width="24"
                    height="24"
                    viewBox="0 0 24 24"
                >
                    <path
                        d="M19.479 10.092c-.212-3.951-3.473-7.092-7.479-7.092-4.005 0-7.267 3.141-7.479 7.092-2.57.463-4.521 2.706-4.521 5.408 0 3.037 2.463 5.5 5.5 5.5h13c3.037 0 5.5-2.463 5.5-5.5 0-2.702-1.951-4.945-4.521-5.408zm-7.479-1.092l4 4h-3v4h-2v-4h-3l4-4z"
                    />
                </svg>
            </i>
            <p class="text-lg text-blue-700">Drop files to upload</p>
        </div>

        <!-- scroll area -->
        <div class="h-full overflow-auto p-8 w-full h-full flex flex-col">
            <!-- <header id="dropzone" class="border-dashed border-2 border-gray-400 py-12 flex flex-col justify-center items-center">
                <p class="mb-3 font-semibold text-gray-900 flex flex-wrap justify-center">
                    <span>Drag and drop your</span>&nbsp;<span>files anywhere or</span>
                </p>
                <input id="hidden-input" type="file" multiple class="hidden" />
                <button id="button" class="mt-2 rounded-sm px-3 py-1 bg-gray-200 hover:bg-gray-300 focus:shadow-outline focus:outline-none">
                    Upload a file
                </button>
            </header> -->
            <header class="flex items-center justify-center w-full">
                <label
                    for="dropzone-file"
                    class="flex flex-col items-center justify-center w-full h-64 border-2 border-gray-300 border-dashed rounded-lg cursor-pointer bg-gray-50 dark:bg-teal-50 dark:hover:bg-bray-800 dark:bg-gray-700 hover:bg-gray-100 dark:border-gray-600 dark:hover:border-gray-500 dark:hover:bg-gray-600"
                >
                    <div class="flex flex-col items-center justify-center pt-5 pb-6">
                        <svg
                            aria-hidden="true"
                            class="w-10 h-10 mb-3 text-gray-400"
                            fill="none"
                            stroke="currentColor"
                            viewBox="0 0 24 24"
                            xmlns="http://www.w3.org/2000/svg"
                        >
                            <path
                                stroke-linecap="round"
                                stroke-linejoin="round"
                                stroke-width="2"
                                d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12"
                            ></path>
                        </svg>
                        <p class="mb-2 text-sm text-gray-500 dark:text-gray-400">
                            <span class="font-semibold">Click to upload</span> or drag and drop
                        </p>
                        <!-- <p class="text-xs text-gray-500 dark:text-gray-400">SVG, PNG, JPG or GIF (MAX. 800x400px)</p> -->
                    </div>
                    <!-- <input id="dropzone-file" type="file" class="hidden" @change="onChangeFile" /> -->
                </label>
            </header>

            <h1 class="pt-8 pb-3 font-semibold sm:text-lg text-gray-900">To Upload</h1>

            <ul id="gallery" class="flex flex-1 flex-wrap -m-1">
                <li
                    v-if="files.length == 0"
                    id="empty"
                    class="h-full w-full text-center flex flex-col items-center justify-center items-center"
                >
                    <svg                       
                        class="w-20 h-20 mb-3 text-gray-400"
                        version="1.1"
                        id="Capa_1"
                        xmlns="http://www.w3.org/2000/svg"
                        xmlns:xlink="http://www.w3.org/1999/xlink"
                        viewBox="0 0 412.533 412.533"
                        xml:space="preserve"
                        fill="#000000"
                    >
                        <g id="SVGRepo_bgCarrier" stroke-width="0"></g>
                        <g id="SVGRepo_tracerCarrier" stroke-linecap="round" stroke-linejoin="round"></g>
                        <g id="SVGRepo_iconCarrier">
                            <g>
                                <path
                                    style="fill: #010002"
                                    d="M412.485,203.954h0.041c0-14.323-5.609-27.336-14.729-37.042l0.016-0.016l-79.27-101.819H90.479 L13.493,168.961l0.033,0.033c-7.283,8.616-11.762,19.565-12.534,31.514C0.415,201.629,0,202.84,0,204.19v135.138 c0,4.495,3.642,8.129,8.129,8.129h396.276c4.495,0,8.129-3.633,8.129-8.129V204.19 C412.533,204.109,412.485,204.035,412.485,203.954z M97.844,81.335H311.43l48.389,68.5c-0.512-0.016-1-0.081-1.52-0.081h-97.502 v24.369c0,27.67-29.052,21.687-37.96,21.687h-32.466c-8.909,0-37.96,5.983-37.96-21.687v-24.369H54.9 c-1.016,0-2.008,0.098-3.016,0.146L97.844,81.335z M396.276,331.199H16.265V204.19c0-0.081-0.041-0.154-0.049-0.236h0.723 c0-20.923,17.029-37.944,37.96-37.944h81.253v8.112c0,27.987,21.281,37.944,54.218,37.944h32.466 c32.945,0,54.218-9.957,54.218-37.944v-8.112h81.261c10.461,0,19.948,4.251,26.824,11.12l0.016,0.016 c6.869,6.869,11.112,16.347,11.112,26.808h0.057c0,0.081-0.049,0.154-0.049,0.236C396.276,204.19,396.276,331.199,396.276,331.199z "
                                ></path>
                            </g>
                        </g>
                    </svg>
                    <span class="text-small text-gray-500">No files selected</span>
                </li>
                <li v-for="(file, index) in files" :key="index" class="block p-1 w-1/2 sm:w-1/3 md:w-1/4 lg:w-1/6 xl:w-1/8 h-24">
                    <article
                        v-if="file.type.match('image.*')"
                        tabindex="0"
                        class="group hasImage w-full h-full rounded-md bg-gray-100 cursor-pointer relative text-transparent hover:text-white shadow-sm"
                    >
                        <img
                            :alt="file.name"
                            :src="generateURL(file)"
                            class="img-preview w-full h-full sticky object-cover rounded-md bg-fixed"
                        />
                        <section class="flex flex-col rounded-md text-xs break-words w-full h-full z-20 absolute top-0 py-2 px-3">
                            <h1 class="flex-1">{{ file.name }}</h1>
                            <div class="flex">
                                <p class="p-1 size text-xs">{{ getFileSize(file) }}</p>
                                <button
                                    class="delete ml-auto focus:outline-none hover:bg-gray-300 p-1 rounded-md"
                                    @click="removeFile(index)"
                                >
                                    <svg
                                        class="pointer-events-none fill-current w-4 h-4 ml-auto"
                                        xmlns="http://www.w3.org/2000/svg"
                                        width="24"
                                        height="24"
                                        viewBox="0 0 24 24"
                                    >
                                        <path
                                            class="pointer-events-none"
                                            d="M3 6l3 18h12l3-18h-18zm19-4v2h-20v-2h5.711c.9 0 1.631-1.099 1.631-2h5.316c0 .901.73 2 1.631 2h5.711z"
                                        />
                                    </svg>
                                </button>
                            </div>
                        </section>
                    </article>
                    <article v-else tabindex="0" class="group w-full h-full rounded-md bg-gray-100 cursor-pointer relative shadow-sm">
                        <section class="flex flex-col rounded-md text-xs break-words w-full h-full z-20 absolute top-0 py-2 px-3">
                            <h1 class="flex-1 group-hover:text-blue-800">{{ file.name }}</h1>
                            <div class="flex">
                                <p class="p-1 size text-xs text-gray-700">{{ getFileSize(file) }}</p>
                                <button
                                    class="delete ml-auto focus:outline-none hover:bg-gray-300 p-1 rounded-md text-gray-800"
                                    @click="removeFile(index)"
                                >
                                    <svg
                                        class="pointer-events-none fill-current w-4 h-4 ml-auto"
                                        xmlns="http://www.w3.org/2000/svg"
                                        width="24"
                                        height="24"
                                        viewBox="0 0 24 24"
                                    >
                                        <path
                                            class="pointer-events-none"
                                            d="M3 6l3 18h12l3-18h-18zm19-4v2h-20v-2h5.711c.9 0 1.631-1.099 1.631-2h5.316c0 .901.73 2 1.631 2h5.711z"
                                        />
                                    </svg>
                                </button>
                            </div>
                        </section>
                    </article>
                </li>
            </ul>
        </div>

        <!-- sticky footer -->
        <footer class="flex justify-end px-8 pb-8 pt-4">
            <button
                id="cancel"
                class="ml-3 rounded-sm px-3 py-1 hover:bg-gray-300 focus:shadow-outline focus:outline-none"
                @click="clearAllFiles"
            >
                Clear
            </button>
        </footer>
    </div>
</template>

<script lang="ts">
import { Component, Vue, Prop, Ref } from 'vue-facing-decorator';
import BaseButton from './BaseButton.vue';
// import { mdiPlus, mdiMinus } from '@mdi/js';
import { mdiTrashCan } from '@mdi/js';

@Component({
    name: 'file-upload',
    components: {
        BaseButton,
        mdiTrashCan,
    },
})
export default class FileUploadComponent extends Vue {
    // mdiPlus = mdiPlus;
    // mdiMinus = mdiMinus;

    /**
     * Connect map id.
     */
    @Prop() public mapId: string;

    @Ref('overlay') overlay: HTMLDivElement;

    private counter: number = 0;
    files: Array<File> = [];
    // mdiTrashCan = mdiTrashCan;

    dragEnterHandler(e) {
        e.preventDefault();
        if (!this._hasFiles(e.dataTransfer)) {
            return;
        }
        ++this.counter && this.overlay.classList.add('draggedover');
    }

    dragLeaveHandler() {
        1 > --this.counter && this.overlay.classList.remove('draggedover');
    }

    dragOverHandler(e) {
        if (this._hasFiles(e.dataTransfer)) {
            e.preventDefault();
        }
    }

    startDrag(evt, item) {
        evt.dataTransfer.dropEffect = 'move';
        evt.dataTransfer.effectAllowed = 'move';
        evt.dataTransfer.setData('itemID', item.id);
    }

    // reset counter and append file to gallery when file is dropped

    dropHandler(event) {
        event.preventDefault();
        for (const file of event.dataTransfer.files) {
            this._addFile(file);
        }
        this.overlay.classList.remove('draggedover');
        this.counter = 0;
    }

    clearAllFiles(event) {
        event.preventDefault();
        this.files.splice(0);
    }

    removeFile(key) {
        this.files.splice(key, 1);
    }

    // check if file is of type image and prepend the initialied
    // template to the target element
    private _addFile(file) {
        // const isImage = file.type.match('image.*');
        // const objectURL = URL.createObjectURL(file);

        // this.files[objectURL] = file;
        this.files.push(file);
    }

    generateURL(file) {
        let fileSrc = URL.createObjectURL(file);
        setTimeout(() => {
            URL.revokeObjectURL(fileSrc);
        }, 1000);
        return fileSrc;
    }

    getFileSize(file) {
        if (file.size > 1024) {
            if (file.size > 1048576) {
                return Math.round(file.size / 1048576) + 'mb';
            } else {
                return Math.round(file.size / 1024) + 'kb';
            }
        } else {
            return file.size + 'b';
        }
    }

    // use to check if a file is being dragged
    private _hasFiles({ types = [] as Array<string> }) {
        return types.indexOf('Files') > -1;
    }
}
</script>

<style lang="css">
.hasImage:hover section {
    background-color: rgba(5, 5, 5, 0.4);
}
.hasImage:hover button:hover {
    background: rgba(5, 5, 5, 0.45);
}

#overlay p,
i {
    opacity: 0;
}

#overlay.draggedover {
    background-color: rgba(255, 255, 255, 0.7);
}
#overlay.draggedover p,
#overlay.draggedover i {
    opacity: 1;
}

.group:hover .group-hover\:text-blue-800 {
    color: #2b6cb0;
}
</style>
