// Line tests cover message cards plugin behavior.
import { describe, expect, it } from "vitest";
import { datetimePickerAction, postbackAction, uriAction } from "./actions.js";
import { registerLineCardCommand } from "./card-command.js";
import {
  createActionCard,
  createCarousel,
  createDeviceControlCard,
  createEventCard,
  createImageCard,
  createInfoCard,
  createListCard,
  createMediaPlayerCard,
} from "./flex-templates.js";
import {
  createConfirmTemplate,
  createButtonTemplate,
  createTemplateCarousel,
  createCarouselColumn,
  createImageCarousel,
  createImageCarouselColumn,
  createProductCarousel,
  messageAction,
} from "./template-messages.js";

const loneHighSurrogate = /[\uD800-\uDBFF](?![\uDC00-\uDFFF])/;

describe("createConfirmTemplate", () => {
  it("truncates text to 240 characters", () => {
    const longText = "x".repeat(300);
    const template = createConfirmTemplate(longText, messageAction("Yes"), messageAction("No"));

    expect((template.template as { text: string }).text.length).toBe(240);
  });

  it("drops a surrogate-pair emoji from fallback altText instead of splitting it", () => {
    const template = createConfirmTemplate(
      `${"x".repeat(399)}😀`,
      messageAction("Yes"),
      messageAction("No"),
    );

    expect(template.altText).toBe("x".repeat(399));
    expect(loneHighSurrogate.test(template.altText)).toBe(false);
  });
});

describe("createButtonTemplate", () => {
  it("limits actions to 4", () => {
    const actions = Array.from({ length: 6 }, (_, i) => messageAction(`Button ${i}`));
    const template = createButtonTemplate("Title", "Text", actions);

    expect((template.template as { actions: unknown[] }).actions.length).toBe(4);
  });

  it("truncates title to 40 characters", () => {
    const longTitle = "x".repeat(50);
    const template = createButtonTemplate(longTitle, "Text", [messageAction("OK")]);

    expect((template.template as { title: string }).title.length).toBe(40);
  });

  it("drops a surrogate-pair emoji from the title instead of splitting it", () => {
    // 39 chars + an emoji land the truncation boundary inside the surrogate pair;
    // a raw code-unit slice would keep only the lone high surrogate.
    const template = createButtonTemplate(`${"x".repeat(39)}😀`, "Text", [messageAction("OK")]);
    const title = (template.template as { title: string }).title;

    expect(title).toBe("x".repeat(39));
    expect(loneHighSurrogate.test(title)).toBe(false);
  });

  it("drops a surrogate-pair emoji from explicit altText instead of splitting it", () => {
    const template = createButtonTemplate("Title", "Text", [messageAction("OK")], {
      altText: `${"x".repeat(399)}😀`,
    });

    expect(template.altText).toBe("x".repeat(399));
    expect(loneHighSurrogate.test(template.altText)).toBe(false);
  });

  it("truncates text to 60 chars when no thumbnail is provided", () => {
    const longText = "x".repeat(100);
    const template = createButtonTemplate("Title", longText, [messageAction("OK")]);

    expect((template.template as { text: string }).text.length).toBe(60);
  });

  it("truncates text to 60 chars when title and thumbnail are provided", () => {
    const longText = "x".repeat(100);
    const template = createButtonTemplate("Title", longText, [messageAction("OK")], {
      thumbnailImageUrl: "https://example.com/thumb.jpg",
    });

    expect((template.template as { text: string }).text.length).toBe(60);
  });
});

describe("createCarouselColumn", () => {
  it("limits actions to 3", () => {
    const column = createCarouselColumn({
      text: "Text",
      actions: [
        messageAction("A1"),
        messageAction("A2"),
        messageAction("A3"),
        messageAction("A4"),
        messageAction("A5"),
      ],
    });

    expect(column.actions.length).toBe(3);
  });

  it("truncates text to 120 characters when no title or image is set", () => {
    const longText = "x".repeat(150);
    const column = createCarouselColumn({ text: longText, actions: [messageAction("OK")] });

    expect(column.text.length).toBe(120);
  });

  it("truncates text to 60 characters when a title is set", () => {
    const longText = "x".repeat(150);
    const column = createCarouselColumn({
      title: "Title",
      text: longText,
      actions: [messageAction("OK")],
    });

    expect(column.text.length).toBe(60);
  });

  it("drops a surrogate-pair emoji from the title instead of splitting it", () => {
    const column = createCarouselColumn({
      title: `${"x".repeat(39)}😀`,
      text: "Text",
      actions: [messageAction("OK")],
    });

    expect(column.title).toBe("x".repeat(39));
    expect(loneHighSurrogate.test(column.title ?? "")).toBe(false);
  });

  it("does not split an emoji grapheme at the 60-code-unit boundary", () => {
    const text = `${"x".repeat(59)}👨‍👩‍👧‍👦after`;
    const column = createCarouselColumn({
      title: "Title",
      text,
      actions: [messageAction("OK")],
    });

    expect(column.text).toBe("x".repeat(59));
  });

  it("keeps required text when the first grapheme exceeds the limit", () => {
    const text = `😀${"\u0301".repeat(59)}`;
    const column = createCarouselColumn({
      title: "Title",
      text,
      actions: [messageAction("OK")],
    });

    expect(column.text.length).toBe(60);
    expect(column.text.startsWith("😀")).toBe(true);
  });

  it("uses the compact limit when a whitespace-only title is present", () => {
    const column = createCarouselColumn({
      title: " ",
      text: "x".repeat(150),
      actions: [messageAction("OK")],
    });

    expect(column.text).toBe("x".repeat(60));
  });

  it("truncates text to 60 characters when a thumbnail image is set", () => {
    const longText = "x".repeat(150);
    const column = createCarouselColumn({
      text: longText,
      thumbnailImageUrl: "https://example.com/thumb.jpg",
      actions: [messageAction("OK")],
    });

    expect(column.text.length).toBe(60);
  });
});

describe("carousel column limits", () => {
  it.each([
    {
      createTemplate: () =>
        createTemplateCarousel(
          Array.from({ length: 15 }, () =>
            createCarouselColumn({ text: "Text", actions: [messageAction("OK")] }),
          ),
        ),
    },
    {
      createTemplate: () =>
        createImageCarousel(
          Array.from({ length: 15 }, (_, i) =>
            createImageCarouselColumn(`https://example.com/${i}.jpg`, messageAction("View")),
          ),
        ),
    },
  ])("limits columns to 10", ({ createTemplate }) => {
    const template = createTemplate();
    expect((template.template as { columns: unknown[] }).columns.length).toBe(10);
  });

  it("drops a surrogate-pair emoji from image-carousel altText instead of splitting it", () => {
    const template = createImageCarousel(
      [createImageCarouselColumn("https://example.com/0.jpg", messageAction("View"))],
      `${"x".repeat(399)}😀`,
    );

    expect(template.altText).toBe("x".repeat(399));
    expect(loneHighSurrogate.test(template.altText)).toBe(false);
  });
});

describe("createProductCarousel", () => {
  it.each([
    {
      title: "Product",
      description: "Desc",
      actionLabel: "Buy",
      actionUrl: "https://shop.com/buy",
      expectedType: "uri",
    },
    {
      title: "Product",
      description: "Desc",
      actionLabel: "Select",
      actionData: "product_id=123",
      expectedType: "postback",
    },
  ])("uses expected action type for product action", ({ expectedType, ...item }) => {
    const template = createProductCarousel([item]);
    const columns = (template.template as { columns: Array<{ actions: Array<{ type: string }> }> })
      .columns;
    expect(columns[0].actions[0].type).toBe(expectedType);
  });

  it("preserves the complete price when truncating a long description", () => {
    const template = createProductCarousel([
      {
        title: "Product",
        description: "x".repeat(59),
        price: "$12.99",
      },
    ]);
    const columns = (template.template as { columns: Array<{ text: string }> }).columns;

    expect(columns[0].text).toBe(`${"x".repeat(53)}\n$12.99`);
    expect(columns[0].text.length).toBe(60);
  });
});

describe("flex cards", () => {
  it("includes footer when provided", () => {
    const card = createInfoCard("Title", "Body", "Footer text");

    const footer = card.footer as { contents: Array<{ text: string }> };
    expect(footer.contents[0].text).toBe("Footer text");
  });

  it("limits list items to 8", () => {
    const items = Array.from({ length: 15 }, (_, i) => ({ title: `Item ${i}` }));
    const card = createListCard("List", items);

    const body = card.body as { contents: Array<{ type: string; contents?: unknown[] }> };
    const listBox = body.contents[2] as { contents: unknown[] };
    expect(listBox.contents.length).toBe(8);
  });

  it("includes image-card body text when provided", () => {
    const card = createImageCard("https://example.com/img.jpg", "Title", "Body text");

    const body = card.body as { contents: Array<{ text: string }> };
    expect(body.contents.length).toBe(2);
    expect(body.contents[1].text).toBe("Body text");
  });

  it("limits action-card actions to 4", () => {
    const actions = Array.from({ length: 6 }, (_, i) => ({
      label: `Action ${i}`,
      action: { type: "message" as const, label: `A${i}`, text: `action${i}` },
    }));
    const card = createActionCard("Title", "Body", actions);

    const footer = card.footer as { contents: unknown[] };
    expect(footer.contents.length).toBe(4);
  });

  it("limits carousels to 12 bubbles", () => {
    const bubbles = Array.from({ length: 15 }, (_, i) => createInfoCard(`Card ${i}`, `Body ${i}`));
    const carousel = createCarousel(bubbles);

    expect(carousel.contents.length).toBe(12);
  });

  it("limits device controls to 6", () => {
    const card = createDeviceControlCard({
      deviceName: "Device",
      controls: Array.from({ length: 10 }, (_, i) => ({
        label: `Control ${i}`,
        data: `action=${i}`,
      })),
    });

    const footer = card.footer as { contents: unknown[] };
    expect(footer.contents.length).toBeLessThanOrEqual(3);
  });

  it("keeps event-card optional fields together", () => {
    const card = createEventCard({
      title: "Team Offsite",
      date: "February 15, 2026",
      time: "9:00 AM - 5:00 PM",
      location: "Mountain View Office",
      description: "Annual team building event",
    });

    expect(card.size).toBe("mega");
    const body = card.body as { contents: Array<{ type: string }> };
    expect(body.contents).toHaveLength(3);
  });
});

describe("action label/data surrogate-safe truncation", () => {
  // 19 ASCII chars + 😀 (U+1F600, two UTF-16 code units) = 21 code units; a raw
  // .slice(0, 20) would keep the first 19 chars plus the lone high surrogate.
  const labelWithEmoji = "1234567890123456789😀";

  it("messageAction drops a half emoji instead of leaving a lone surrogate", () => {
    const action = messageAction(labelWithEmoji) as { label: string };

    expect(action.label).toBe("1234567890123456789");
    expect(loneHighSurrogate.test(action.label)).toBe(false);
  });

  it("messageAction leaves a short ASCII label unchanged", () => {
    const action = messageAction("Yes");

    expect(action.label).toBe("Yes");
  });

  it("uriAction drops a half emoji instead of leaving a lone surrogate", () => {
    const action = uriAction(labelWithEmoji, "https://example.com") as { label: string };

    expect(action.label).toBe("1234567890123456789");
    expect(loneHighSurrogate.test(action.label)).toBe(false);
  });

  it("postbackAction truncates label and data on surrogate boundaries", () => {
    // 299 ASCII chars + 😀 = 301 code units; the 300-unit slice cuts the emoji.
    const data = `${"d".repeat(299)}😀`;
    const action = postbackAction(labelWithEmoji, data) as {
      label: string;
      data: string;
    };

    expect(action.label).toBe("1234567890123456789");
    expect(loneHighSurrogate.test(action.label)).toBe(false);
    expect(action.data).toBe("d".repeat(299));
    expect(loneHighSurrogate.test(action.data)).toBe(false);
  });

  it("postbackAction truncates displayText on surrogate boundaries but keeps undefined", () => {
    const displayText = `${"t".repeat(299)}😀`;
    const withDisplay = postbackAction("Label", "data", displayText) as {
      displayText?: string;
    };
    const withoutDisplay = postbackAction("Label", "data") as { displayText?: string };

    expect(withDisplay.displayText).toBe("t".repeat(299));
    expect(loneHighSurrogate.test(withDisplay.displayText ?? "")).toBe(false);
    expect(withoutDisplay.displayText).toBeUndefined();
  });

  it("datetimePickerAction truncates label and data on surrogate boundaries", () => {
    const data = `${"d".repeat(299)}😀`;
    const action = datetimePickerAction(labelWithEmoji, data, "datetime") as {
      label: string;
      data: string;
    };

    expect(action.label).toBe("1234567890123456789");
    expect(loneHighSurrogate.test(action.label)).toBe(false);
    expect(action.data).toBe("d".repeat(299));
    expect(loneHighSurrogate.test(action.data)).toBe(false);
  });

  it("/card action command uses surrogate-safe labels and postback data", async () => {
    const registerCommand = (command: unknown) => {
      const { handler } = command as {
        handler: (ctx: { args: string; channel: string }) => Promise<unknown>;
      };
      return handler({
        channel: "line",
        args: `action "Menu" "Body" --actions "${labelWithEmoji}|k=${"d".repeat(297)}😀"`,
      });
    };
    const result = (await registerCommandWithHandler(registerCommand)) as {
      channelData: {
        line: {
          flexMessage: {
            contents: { footer: { contents: Array<{ action: { label: string; data: string } }> } };
          };
        };
      };
    };
    const action = result.channelData.line.flexMessage.contents.footer.contents[0].action;

    expect(action.label).toBe("1234567890123456789");
    expect(loneHighSurrogate.test(action.label)).toBe(false);
    expect(action.data).toBe(`k=${"d".repeat(297)}`);
    expect(loneHighSurrogate.test(action.data)).toBe(false);
  });

  it("/card receipt altText truncates on a surrogate boundary", async () => {
    // The emoji's surrogate pair straddles the 400-char altText cap; a raw
    // slice used to leave a lone high surrogate in the receipt flex altText.
    const registerCommand = (command: unknown) => {
      const { handler } = command as {
        handler: (ctx: { args: string; channel: string }) => Promise<unknown>;
      };
      return handler({
        channel: "line",
        args: `receipt "R" "${"a".repeat(395)}:😀x" --total "$30"`,
      });
    };
    const result = (await registerCommandWithHandler(registerCommand)) as {
      channelData: { line: { flexMessage: { altText: string } } };
    };
    const altText = result.channelData.line.flexMessage.altText;

    expect(altText.length).toBeLessThanOrEqual(400);
    expect(loneHighSurrogate.test(altText)).toBe(false);
  });

  it("media control postback labels truncate on surrogate boundaries", () => {
    const card = createMediaPlayerCard({
      title: "Track",
      controls: {
        play: { data: "play" },
      },
      extraActions: [{ label: `${"x".repeat(14)}😀`, data: "extra" }],
    });
    const footer = card.footer as {
      contents: Array<{ contents?: Array<{ action?: { data?: string; label: string } }> }>;
    };
    const extraAction = footer.contents
      .flatMap((content) => content.contents ?? [])
      .find((button) => button.action?.data === "extra")?.action;

    expect(extraAction?.label).toBe("x".repeat(14));
    expect(loneHighSurrogate.test(extraAction?.label ?? "")).toBe(false);
  });
});

async function registerCommandWithHandler(
  runHandler: (command: unknown) => Promise<unknown>,
): Promise<unknown> {
  let result: unknown;
  registerLineCardCommand({
    registerCommand(command: unknown) {
      result = runHandler(command);
    },
  } as never);
  return result;
}