geo/apps/admin-web/src/components/CoverPickerModal.vue

<script setup lang="ts">
import { CloseOutlined, CloudUploadOutlined, PlusOutlined } from "@ant-design/icons-vue";
import { message } from "ant-design-vue";
import { computed, onBeforeUnmount, ref, watch } from "vue";
import { useI18n } from "vue-i18n";

import { articlesApi } from "@/lib/api";
import {
  deriveCoverFileName,
  getPrimaryCoverRequirement,
  type PlatformCoverRequirement,
} from "@/lib/cover-requirements";
import { formatError } from "@/lib/errors";

const props = defineProps<{
  open: boolean;
  articleId: number | null;
  platformIds: string[];
  currentUrl?: string | null;
  currentFileName?: string | null;
}>();

const emit = defineEmits<{
  "update:open": [value: boolean];
  confirmed: [payload: { url: string; fileName: string }];
}>();

const { t } = useI18n();

const fileInput = ref<HTMLInputElement | null>(null);
const activeTab = ref("local");
const workingUrl = ref("");
const workingFileName = ref("");
const sourceKind = ref<"remote" | "local" | null>(null);
const naturalWidth = ref(0);
const naturalHeight = ref(0);
const zoom = ref(1);
const offsetX = ref(0);
const offsetY = ref(0);
const confirmLoading = ref(false);
const transformDirty = ref(false);
const localObjectUrl = ref("");
const localFile = ref<File | null>(null);

const dragging = ref(false);
const dragStartX = ref(0);
const dragStartY = ref(0);
const dragOriginX = ref(0);
const dragOriginY = ref(0);
const imageLoadToken = ref(0);

const primaryRequirement = computed(() => getPrimaryCoverRequirement(props.platformIds));
const aspectRatioLocked = computed(() => Boolean(primaryRequirement.value.aspectRatio));
const localTabLabel = computed(() =>
  workingUrl.value ? `${t("coverPicker.tabs.local")} (1)` : t("coverPicker.tabs.local"),
);
const hasImage = computed(() => Boolean(workingUrl.value));
const previewHint = computed(() =>
  aspectRatioLocked.value ? t("coverPicker.previewHintLocked") : t("coverPicker.previewHintFree"),
);
const stageSize = computed(() => {
  const ratio = primaryRequirement.value.aspectRatio
    || (naturalWidth.value > 0 && naturalHeight.value > 0 ? naturalWidth.value / naturalHeight.value : 4 / 3);
  const maxWidth = 720;
  const maxHeight = 420;

  let width = maxWidth;
  let height = width / ratio;

  if (height > maxHeight) {
    height = maxHeight;
    width = height * ratio;
  }

  return {
    width: Math.round(width),
    height: Math.round(height),
  };
});

const displayMetrics = computed(() => {
  if (!naturalWidth.value || !naturalHeight.value) {
    return {
      width: 0,
      height: 0,
      baseScale: 1,
    };
  }

  const baseScale = Math.max(
    stageSize.value.width / naturalWidth.value,
    stageSize.value.height / naturalHeight.value,
  );
  const scaled = baseScale * zoom.value;

  return {
    width: naturalWidth.value * scaled,
    height: naturalHeight.value * scaled,
    baseScale,
  };
});

const stageImageStyle = computed(() => ({
  width: `${displayMetrics.value.width}px`,
  height: `${displayMetrics.value.height}px`,
  transform: `translate(calc(-50% + ${offsetX.value}px), calc(-50% + ${offsetY.value}px))`,
}));

const stageFrameStyle = computed(() => ({
  width: `${stageSize.value.width}px`,
  height: `${stageSize.value.height}px`,
}));

watch(
  () => props.open,
  (open) => {
    if (open) {
      hydrateFromProps();
      return;
    }
    stopDragging();
  },
  { immediate: true },
);

watch(
  () => [props.currentUrl, props.currentFileName],
  () => {
    if (props.open && sourceKind.value !== "local") {
      hydrateFromProps();
    }
  },
);

watch(
  () => props.platformIds.join(","),
  () => {
    if (!props.open || !hasImage.value) {
      return;
    }
    resetTransform();
  },
);

watch(
  () => [zoom.value, naturalWidth.value, naturalHeight.value, stageSize.value.width, stageSize.value.height],
  () => {
    clampOffsets();
  },
);

onBeforeUnmount(() => {
  stopDragging();
  revokeLocalObjectUrl();
});

function hydrateFromProps(): void {
  activeTab.value = "local";
  transformDirty.value = false;
  const nextUrl = String(props.currentUrl ?? "").trim();
  const nextFileName = String(props.currentFileName ?? "").trim() || deriveCoverFileName(nextUrl);

  workingUrl.value = nextUrl;
  workingFileName.value = nextFileName;
  sourceKind.value = nextUrl ? "remote" : null;
  localFile.value = null;

  if (!nextUrl) {
    resetStage();
    return;
  }

  void loadImageMeta(nextUrl);
}

function resetStage(): void {
  naturalWidth.value = 0;
  naturalHeight.value = 0;
  resetTransform();
}

function resetTransform(): void {
  zoom.value = 1;
  offsetX.value = 0;
  offsetY.value = 0;
  transformDirty.value = false;
}

function clampOffsets(): void {
  const maxX = Math.max(0, (displayMetrics.value.width - stageSize.value.width) / 2);
  const maxY = Math.max(0, (displayMetrics.value.height - stageSize.value.height) / 2);

  offsetX.value = clamp(offsetX.value, -maxX, maxX);
  offsetY.value = clamp(offsetY.value, -maxY, maxY);
}

function markTransformDirty(): void {
  transformDirty.value = zoom.value !== 1 || offsetX.value !== 0 || offsetY.value !== 0;
}

function clamp(value: number, min: number, max: number): number {
  return Math.min(Math.max(value, min), max);
}

async function loadImageMeta(url: string): Promise<void> {
  const token = imageLoadToken.value + 1;
  imageLoadToken.value = token;

  try {
    const image = await loadImageElement(url);
    if (token !== imageLoadToken.value) {
      return;
    }

    naturalWidth.value = image.naturalWidth;
    naturalHeight.value = image.naturalHeight;
    resetTransform();
  } catch {
    if (token !== imageLoadToken.value) {
      return;
    }

    resetStage();
    message.warning(t("coverPicker.messages.imageLoadFailed"));
  }
}

function openFileDialog(): void {
  fileInput.value?.click();
}

function handleFileChange(event: Event): void {
  const input = event.target as HTMLInputElement;
  const file = input.files?.[0];
  input.value = "";

  if (!file) {
    return;
  }
  if (!/^image\/(png|jpeg|gif|webp)$/i.test(file.type)) {
    message.warning(t("coverPicker.messages.invalidType"));
    return;
  }
  if (file.size > 10 * 1024 * 1024) {
    message.warning(t("coverPicker.messages.tooLarge"));
    return;
  }

  revokeLocalObjectUrl();
  const objectUrl = URL.createObjectURL(file);
  localObjectUrl.value = objectUrl;
  workingUrl.value = objectUrl;
  workingFileName.value = file.name;
  sourceKind.value = "local";
  localFile.value = file;
  transformDirty.value = false;
  void loadImageMeta(objectUrl);
}

function revokeLocalObjectUrl(): void {
  if (!localObjectUrl.value) {
    return;
  }
  URL.revokeObjectURL(localObjectUrl.value);
  localObjectUrl.value = "";
}

function handleStageMouseDown(event: MouseEvent): void {
  if (!hasImage.value || confirmLoading.value) {
    return;
  }

  dragging.value = true;
  dragStartX.value = event.clientX;
  dragStartY.value = event.clientY;
  dragOriginX.value = offsetX.value;
  dragOriginY.value = offsetY.value;
  window.addEventListener("mousemove", handleWindowMouseMove);
  window.addEventListener("mouseup", handleWindowMouseUp);
}

function handleWindowMouseMove(event: MouseEvent): void {
  if (!dragging.value) {
    return;
  }

  offsetX.value = dragOriginX.value + event.clientX - dragStartX.value;
  offsetY.value = dragOriginY.value + event.clientY - dragStartY.value;
  clampOffsets();
  markTransformDirty();
}

function handleWindowMouseUp(): void {
  stopDragging();
}

function stopDragging(): void {
  if (!dragging.value) {
    return;
  }

  dragging.value = false;
  window.removeEventListener("mousemove", handleWindowMouseMove);
  window.removeEventListener("mouseup", handleWindowMouseUp);
}

function handleZoomChange(value: number | [number, number]): void {
  const nextValue = Array.isArray(value) ? value[0] : value;
  zoom.value = clamp(nextValue, 1, 2.4);
  clampOffsets();
  markTransformDirty();
}

function handleClear(): void {
  if (confirmLoading.value) {
    return;
  }

  workingUrl.value = "";
  workingFileName.value = "";
  sourceKind.value = null;
  localFile.value = null;
  transformDirty.value = false;
  resetStage();
  revokeLocalObjectUrl();
}

async function handleConfirm(): Promise<void> {
  if (!workingUrl.value) {
    message.warning(t("coverPicker.messages.missingImage"));
    return;
  }

  if (!props.articleId) {
    message.error(t("coverPicker.messages.missingArticle"));
    return;
  }

  if (sourceKind.value !== "local" && !transformDirty.value && !aspectRatioLocked.value) {
    emit("confirmed", {
      url: workingUrl.value,
      fileName: workingFileName.value || deriveCoverFileName(workingUrl.value) || "cover.png",
    });
    emit("update:open", false);
    return;
  }

  confirmLoading.value = true;
  try {
    if (sourceKind.value === "local" && !transformDirty.value && !aspectRatioLocked.value && localFile.value) {
      const uploaded = await articlesApi.uploadImage(props.articleId, localFile.value);
      emit("confirmed", {
        url: uploaded.url,
        fileName: localFile.value.name,
      });
      emit("update:open", false);
      return;
    }

    const blob = await renderCroppedBlob(primaryRequirement.value);
    const fileName = ensureImageExtension(
      workingFileName.value || deriveCoverFileName(workingUrl.value) || "cover.png",
      blob.type,
    );
    const file = new File([blob], fileName, { type: blob.type });
    const uploaded = await articlesApi.uploadImage(props.articleId, file);

    emit("confirmed", {
      url: uploaded.url,
      fileName,
    });
    emit("update:open", false);
  } catch (error) {
    message.error(formatError(error));
  } finally {
    confirmLoading.value = false;
  }
}

async function renderCroppedBlob(requirement: PlatformCoverRequirement): Promise<Blob> {
  const image = await loadImageElement(workingUrl.value);
  const canvas = document.createElement("canvas");
  canvas.width = requirement.outputWidth ?? Math.max(Math.round(stageSize.value.width * 2), 1);
  canvas.height = requirement.outputHeight ?? Math.max(Math.round(stageSize.value.height * 2), 1);

  const context = canvas.getContext("2d");
  if (!context) {
    throw new Error("article_image_upload_failed");
  }

  const baseScale = Math.max(
    stageSize.value.width / image.naturalWidth,
    stageSize.value.height / image.naturalHeight,
  );
  const renderedWidth = image.naturalWidth * baseScale * zoom.value;
  const renderedHeight = image.naturalHeight * baseScale * zoom.value;
  const outputScale = canvas.width / stageSize.value.width;

  context.fillStyle = "#ffffff";
  context.fillRect(0, 0, canvas.width, canvas.height);
  context.drawImage(
    image,
    (stageSize.value.width / 2 - renderedWidth / 2 + offsetX.value) * outputScale,
    (stageSize.value.height / 2 - renderedHeight / 2 + offsetY.value) * outputScale,
    renderedWidth * outputScale,
    renderedHeight * outputScale,
  );

  const blob = await new Promise<Blob | null>((resolve) => {
    canvas.toBlob(resolve, "image/png", 0.92);
  });

  if (!blob) {
    throw new Error("article_image_upload_failed");
  }

  return blob;
}

function ensureImageExtension(fileName: string, mimeType: string): string {
  const trimmed = fileName.trim();
  const normalizedMime = mimeType.toLowerCase();
  const extension = normalizedMime.includes("webp")
    ? "webp"
    : normalizedMime.includes("gif")
      ? "gif"
      : normalizedMime.includes("jpeg")
        ? "jpg"
        : "png";

  if (/\.(png|jpe?g|gif|webp)$/i.test(trimmed)) {
    return trimmed;
  }

  return `${trimmed || "cover"}.${extension}`;
}

function closeModal(): void {
  emit("update:open", false);
}

function loadImageElement(url: string): Promise<HTMLImageElement> {
  return new Promise((resolve, reject) => {
    const image = new Image();
    image.onload = () => resolve(image);
    image.onerror = () => reject(new Error("article_image_upload_failed"));
    image.src = url;
  });
}
</script>

<template>
  <a-modal
    :open="open"
    :width="900"
    :confirm-loading="confirmLoading"
    :ok-text="t('common.confirm')"
    :cancel-text="t('common.cancel')"
    :title="t('coverPicker.title')"
    @ok="handleConfirm"
    @cancel="closeModal"
  >
    <div class="cover-picker">
      <input
        ref="fileInput"
        type="file"
        accept="image/png,image/jpeg,image/gif,image/webp"
        hidden
        @change="handleFileChange"
      />

      <a-tabs v-model:activeKey="activeTab" class="cover-picker__tabs">
        <a-tab-pane key="local" :tab="localTabLabel">
          <div class="cover-picker__body">
            <section class="cover-picker__workspace">
              <div class="cover-picker__stage-panel">
                <div
                  class="cover-picker__stage-frame"
                  :class="{ 'cover-picker__stage-frame--dragging': dragging }"
                  :style="stageFrameStyle"
                  @mousedown.prevent="handleStageMouseDown"
                >
                  <template v-if="hasImage">
                    <img
                      class="cover-picker__stage-image"
                      :src="workingUrl"
                      :style="stageImageStyle"
                      alt="cover preview"
                      draggable="false"
                    />
                    <div class="cover-picker__stage-outline"></div>
                  </template>

                  <button
                    v-else
                    class="cover-picker__stage-empty"
                    type="button"
                    @click="openFileDialog"
                  >
                    <span class="cover-picker__stage-empty-icon">
                      <CloudUploadOutlined />
                    </span>
                    <strong>点击本地上传</strong>
                    <small>支持jpg、png等格式，单张图片最大支持5M，清晰的图片更有利于推荐</small>
                  </button>
                </div>
              </div>

              <div v-if="hasImage" class="cover-picker__controls">
                <span>{{ t("coverPicker.zoom") }}</span>
                <a-slider
                  class="cover-picker__slider"
                  :min="1"
                  :max="2.4"
                  :step="0.05"
                  :value="zoom"
                  :disabled="!hasImage"
                  @change="handleZoomChange"
                />
                <strong>{{ Math.round(zoom * 100) }}%</strong>
                <a-button size="small" @click="resetTransform" style="margin-left: 16px;">
                  {{ t("coverPicker.actions.reset") }}
                </a-button>
              </div>

              <div v-if="hasImage" class="cover-picker__thumbs">
                <button class="cover-picker__upload-tile" type="button" @click="openFileDialog">
                  <span class="cover-picker__upload-tile-icon">
                    <PlusOutlined />
                  </span>
                  <span>{{ t("coverPicker.actions.upload") }}</span>
                </button>

                <div
                  v-if="hasImage"
                  class="cover-picker__thumb cover-picker__thumb--active"
                >
                  <img :src="workingUrl" alt="cover thumbnail" />
                  <button type="button" class="cover-picker__thumb-close" @click="handleClear">
                    <CloseOutlined />
                  </button>
                </div>
              </div>
            </section>
          </div>
        </a-tab-pane>

        <a-tab-pane key="ai" :tab="t('coverPicker.tabs.ai')">
          <div class="cover-picker__ai-placeholder">
            <strong>{{ t("coverPicker.aiTitle") }}</strong>
            <p>{{ t("coverPicker.aiHint") }}</p>
          </div>
        </a-tab-pane>
      </a-tabs>
    </div>
  </a-modal>
</template>

<style scoped>
.cover-picker {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cover-picker__tabs :deep(.ant-tabs-nav) {
  margin-bottom: 20px;
}

.cover-picker__body {
  display: block;
}

.cover-picker__workspace,
.cover-picker__ai-placeholder {
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.cover-picker__workspace {
  padding: 0;
}

.cover-picker__stage-panel {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
  margin-top: 0;
  border-radius: 4px;
  background: #f7f8fa;
  min-height: 420px;
}

.cover-picker__stage-frame {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  background: transparent;
  box-shadow: none;
  cursor: grab;
  user-select: none;
}

.cover-picker__stage-frame--dragging {
  cursor: grabbing;
}

.cover-picker__stage-image {
  position: absolute;
  top: 50%;
  left: 50%;
  max-width: none;
  object-fit: cover;
  will-change: transform;
}

.cover-picker__stage-outline {
  position: absolute;
  inset: 0;
  border: 3px solid #3b5bff;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.65),
    0 0 0 999px rgba(255, 255, 255, 0.22);
}

.cover-picker__stage-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  height: 100%;
  border: 0;
  background: transparent;
  color: #475467;
  cursor: pointer;
}

.cover-picker__ai-placeholder strong,
.cover-picker__stage-empty strong {
  margin: 0;
  color: #111827;
  font-size: 16px;
  font-weight: 800;
}

.cover-picker__ai-placeholder p,
.cover-picker__stage-empty small {
  font-size: 13px;
  color: #667085;
}

.cover-picker__stage-empty-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  border-radius: 999px;
  background: #e9ecef;
  color: #fff;
  font-size: 40px;
  margin-bottom: 8px;
}

.cover-picker__upload-tile-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 999px;
  background: rgba(53, 93, 255, 0.12);
  color: #355dff;
  font-size: 24px;
}

.cover-picker__controls {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
  color: #475467;
  font-size: 13px;
}

.cover-picker__slider {
  flex: 1;
  margin: 0;
}

.cover-picker__thumbs {
  display: flex;
  align-items: stretch;
  gap: 14px;
  margin-top: 20px;
  min-height: 124px;
}

.cover-picker__upload-tile,
.cover-picker__thumb {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  width: 124px;
  height: 124px;
  padding: 14px;
  border-radius: 20px;
  border: 1px solid rgba(219, 228, 242, 0.92);
  background: #fff;
  color: #475467;
}

.cover-picker__upload-tile {
  align-items: center;
  cursor: pointer;
}

.cover-picker__thumb {
  position: relative;
  align-items: center;
  box-shadow: inset 0 0 0 2px rgba(53, 93, 255, 0.88);
}

.cover-picker__thumb img {
  width: 100%;
  height: 100%;
  border-radius: 12px;
  object-fit: cover;
}

.cover-picker__thumb-close {
  position: absolute;
  top: -8px;
  right: -8px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.45);
  color: #ffffff !important;
  border: none;
  cursor: pointer;
  font-size: 11px;
  backdrop-filter: blur(4px);
  transition: background-color 0.2s, transform 0.2s;
  z-index: 10;
}

.cover-picker__thumb-close :deep(.anticon),
.cover-picker__thumb-close :deep(svg) {
  color: #ffffff !important;
  fill: #ffffff !important;
}

.cover-picker__thumb-close:hover {
  background-color: rgba(0, 0, 0, 0.65);
  transform: scale(1.05);
}

.cover-picker__ai-placeholder {
  padding: 28px 22px;
}

@media (max-width: 960px) {
  .cover-picker__thumbs {
    flex-wrap: wrap;
  }

  .cover-picker__remove {
    margin-left: 0;
  }
}
</style>