// @vitest-environment jsdom

import { flushPromises, mount } from "@vue/test-utils";
import { describe, expect, it, vi } from "vitest";
import BuefyTree from "@/components/buefy/tree/BuefyTree.vue";

vi.mock("buefy", () => ({
  BCheckbox: {
    name: "BCheckbox",
    props: {
      modelValue: Boolean,
      indeterminate: Boolean,
      disabled: Boolean,
    },
    emits: ["update:modelValue"],
    template: `
      <button
        class="b-checkbox-stub"
        type="button"
        :disabled="disabled"
        :data-checked="modelValue"
        :data-indeterminate="indeterminate"
        @click="$emit('update:modelValue', !modelValue)"
      ></button>
    `,
  },
}));

describe("BuefyTree checkbox selection", () => {
  it("removes the icon wrapper only for nodes that explicitly opt out", () => {
    const wrapper = mount(BuefyTree, {
      props: {
        data: [
          { id: "default-icon", label: "Default icon", isLeaf: true },
          { id: "compact", label: "Compact", isLeaf: true, hideIcon: true, hideToggle: true },
        ],
      },
    });

    expect(wrapper.find('[data-node-key="default-icon"] > .b-tree-node-content .b-tree-node-icon').exists()).toBe(true);
    expect(wrapper.find('[data-node-key="compact"] > .b-tree-node-content .b-tree-node-icon').exists()).toBe(false);
    expect(wrapper.find('[data-node-key="default-icon"] > .b-tree-node-content .b-tree-node-toggle').exists()).toBe(
      true
    );
    expect(wrapper.find('[data-node-key="compact"] > .b-tree-node-content .b-tree-node-toggle').exists()).toBe(false);
  });

  it("uses non-selectable checkable categories as lazy select-all branch controllers", async () => {
    const load = vi.fn(async () => [
      { id: "order:70128", label: "Ordre #70128", selectable: true, isLeaf: true },
      { id: "order:70129", label: "Ordre #70129", selectable: true, isLeaf: true },
    ]);
    const wrapper = mount(BuefyTree, {
      props: {
        data: [
          {
            id: "category:orders",
            label: "Orders",
            selectable: false,
            checkable: true,
            isLeaf: false,
          },
        ],
        selectionMode: "checkbox",
        lazy: true,
        load,
      },
    });

    await wrapper.find(".b-checkbox-stub").trigger("click");
    await flushPromises();

    expect(load).toHaveBeenCalledTimes(1);
    expect(wrapper.emitted("update:checkedKeys")?.at(-1)?.[0]).toEqual(["order:70128", "order:70129"]);

    await wrapper.find(".b-checkbox-stub").trigger("click");
    await flushPromises();

    expect(load).toHaveBeenCalledTimes(1);
    expect(wrapper.emitted("update:checkedKeys")?.at(-1)?.[0]).toEqual([]);
  });

  it("renders progressive batches while selecting every logical child", async () => {
    const children = Array.from({ length: 1000 }, (_, index) => ({
      id: `order:${index + 1}`,
      label: `Order ${index + 1}`,
      selectable: true,
      isLeaf: true,
    }));
    const wrapper = mount(BuefyTree, {
      props: {
        data: [{ id: "category:orders", label: "Orders", selectable: false, checkable: true, isLeaf: false }],
        selectionMode: "checkbox",
        lazy: true,
        progressiveBatchSize: 50,
        loadMoreLabel: "Show {count} more",
        load: vi.fn(async () => children),
      },
    });

    await wrapper.find(".b-tree-node-toggle").trigger("click");
    await flushPromises();
    expect(wrapper.findAll('[data-node-key^="order:"]')).toHaveLength(50);
    expect(wrapper.get(".b-tree-load-more__button").text()).toContain("Show 50 more");

    await wrapper.get(".b-tree-load-more__button").trigger("click");
    expect(wrapper.findAll('[data-node-key^="order:"]')).toHaveLength(100);

    await wrapper.find(".b-checkbox-stub").trigger("click");
    await flushPromises();
    expect(wrapper.emitted("update:checkedKeys")?.at(-1)?.[0]).toHaveLength(1000);
    expect(wrapper.findAll('[data-node-key^="order:"]')).toHaveLength(100);
  });

  it("recursively expands lazy branches, reveals every child, and reuses the cache after collapse", async () => {
    let activeLoads = 0;
    let maxActiveLoads = 0;
    const load = vi.fn(async (node) => {
      activeLoads += 1;
      maxActiveLoads = Math.max(maxActiveLoads, activeLoads);
      await Promise.resolve();
      activeLoads -= 1;

      if (node.id === "root") {
        return [
          { id: "branch:a", label: "Branch A", isLeaf: false },
          { id: "branch:b", label: "Branch B", isLeaf: false },
        ];
      }
      if (node.id === "branch:a") {
        return [
          { id: "leaf:a1", label: "Leaf A1", isLeaf: true },
          { id: "leaf:a2", label: "Leaf A2", isLeaf: true },
        ];
      }
      if (node.id === "branch:b") {
        return [{ id: "branch:b1", label: "Branch B1", isLeaf: false }];
      }
      if (node.id === "branch:b1") {
        return [{ id: "leaf:b1", label: "Leaf B1", isLeaf: true }];
      }
      return [];
    });
    const wrapper = mount(BuefyTree, {
      props: {
        data: [{ id: "root", label: "Root", isLeaf: false }],
        lazy: true,
        load,
        progressiveBatchSize: 1,
      },
    });

    const [firstResult, duplicateResult] = await Promise.all([wrapper.vm.expandAll(), wrapper.vm.expandAll()]);
    await flushPromises();

    expect(firstResult).toEqual(duplicateResult);
    expect(firstResult.cancelled).toBe(false);
    expect(firstResult.failedKeys).toEqual([]);
    expect(firstResult.expandedKeys).toEqual(["root", "branch:a", "branch:b", "branch:b1"]);
    expect(load).toHaveBeenCalledTimes(4);
    expect(maxActiveLoads).toBeGreaterThan(1);
    expect(maxActiveLoads).toBeLessThanOrEqual(4);
    expect(wrapper.findAll('[data-node-key^="branch:"]')).toHaveLength(3);
    expect(wrapper.findAll('[data-node-key^="leaf:"]')).toHaveLength(3);

    wrapper.vm.collapseAll();
    await flushPromises();
    expect(wrapper.findAll('[data-node-key^="branch:"]')).toHaveLength(0);

    await wrapper.vm.expandAll();
    await flushPromises();
    expect(load).toHaveBeenCalledTimes(4);
    expect(wrapper.findAll('[data-node-key^="leaf:"]')).toHaveLength(3);
  });

  it("continues expanding sibling branches when one lazy branch fails", async () => {
    const load = vi.fn(async (node) => {
      if (node.id === "root") {
        return [
          { id: "branch:good", label: "Good", isLeaf: false },
          { id: "branch:bad", label: "Bad", isLeaf: false },
        ];
      }
      if (node.id === "branch:bad") {
        throw new Error("Branch failed");
      }
      return [{ id: "leaf:good", label: "Good leaf", isLeaf: true }];
    });
    const wrapper = mount(BuefyTree, {
      props: {
        data: [{ id: "root", label: "Root", isLeaf: false }],
        lazy: true,
        load,
      },
    });

    const result = await wrapper.vm.expandAll();
    await flushPromises();

    expect(result.cancelled).toBe(false);
    expect(result.failedKeys).toEqual(["branch:bad"]);
    expect(result.expandedKeys).toEqual(["root", "branch:good", "branch:bad"]);
    expect(wrapper.emitted("load-error")?.[0]?.[0]).toEqual(new Error("Branch failed"));
    expect(wrapper.get('[data-node-key="leaf:good"]').text()).toContain("Good leaf");
    expect(wrapper.get('[data-node-key="branch:bad"]').classes()).toContain("has-load-error");
  });
});