// TRACES: UR-025 | DR-132 | UT-123
import { describe, it, expect } from "vitest";
import type { SyncQueueItem } from "$lib/api/bindings";
import {
  describeOperation,
  describeSubject,
  isStuck,
  summarize,
  sortForDisplay,
} from "./pendingSync.logic";

function row(overrides: Partial<SyncQueueItem> = {}): SyncQueueItem {
  return {
    id: 1,
    userId: "u1",
    operation: "report_playback_stopped",
    itemId: "ep1",
    payload: null,
    status: "pending",
    retryCount: 0,
    createdAt: "2026-08-01T10:00:00Z",
    errorMessage: null,
    itemName: null,
    ...overrides,
  } as SyncQueueItem;
}

describe("pending sync row description", () => {
  it("labels the operations the backend can queue", () => {
    expect(describeOperation("report_playback_stopped")).toBe("Watch position");
    expect(describeOperation("mark_played")).toBe("Marked as watched");
    expect(describeOperation("report_playback_start")).toBe("Playback started");
  });

  it("still renders an operation it has no label for", () => {
    // An unlabelled row is the one heading for abandonment — it must not
    // render blank, which is the failure this whole surface exists to fix.
    expect(describeOperation("teleport_item")).toBe("teleport item");
  });

  it("names the item when the catalog knows it, and falls back to the id", () => {
    expect(describeSubject(row({ itemName: "The Expanse S01E01" }))).toBe(
      "The Expanse S01E01",
    );
    expect(describeSubject(row({ itemName: null, itemId: "abc123" }))).toBe("abc123");
    expect(describeSubject(row({ itemName: null, itemId: null }))).toBe("Unknown item");
  });
});

describe("stuck rows", () => {
  it("treats a failed or retried row as stuck", () => {
    expect(isStuck(row({ status: "failed", retryCount: 1 }))).toBe(true);
    expect(isStuck(row({ status: "pending", retryCount: 2 }))).toBe(true);
    expect(isStuck(row())).toBe(false);
  });

  it("summarizes a mixed queue", () => {
    const summary = summarize([row(), row({ id: 2, status: "failed", retryCount: 1 })]);
    expect(summary).toEqual({ total: 2, stuck: 1, allStuck: false });
  });

  it("reports allStuck only when every row has failed", () => {
    expect(summarize([row({ status: "failed", retryCount: 3 })]).allStuck).toBe(true);
    expect(summarize([]).allStuck).toBe(false);
  });
});

describe("display order", () => {
  it("lists oldest first — the order they will be replayed in", () => {
    const sorted = sortForDisplay([
      row({ id: 3, createdAt: "2026-08-01T12:00:00Z" }),
      row({ id: 1, createdAt: "2026-08-01T10:00:00Z" }),
      row({ id: 2, createdAt: "2026-08-01T11:00:00Z" }),
    ]);
    expect(sorted.map((r) => r.id)).toEqual([1, 2, 3]);
  });

  it("keeps timestamp-less rows instead of dropping them", () => {
    const sorted = sortForDisplay([
      row({ id: 2, createdAt: null }),
      row({ id: 1, createdAt: "2026-08-01T10:00:00Z" }),
    ]);
    expect(sorted.map((r) => r.id)).toEqual([1, 2]);
  });
});
