import { describe, expect, it } from "vitest";
import {
	formatStructuredText,
	formatUsage,
	formatValueMarkdown,
	summarizeValue,
} from "../display.ts";

describe("usage presentation", () => {
	it("separates cost/output from uncached and cached input without changing usage", () => {
		const usage = {
			input: 332086,
			output: 4283,
			total: 775665,
			cacheRead: 439296,
			cacheWrite: 0,
			cost: 0.16068544,
		};
		const original = { ...usage };
		expect(formatUsage(usage)).toEqual({
			summary: "$0.1607 · 4.28k output",
			detail: "332k uncached input · 439k cache read · 0 cache write",
		});
		expect(usage).toEqual(original);
		expect(formatUsage({ ...usage, total: 999999 })).toEqual(
			formatUsage(usage),
		);
	});

	it.each([
		[0, "$0.0000"],
		[0.000001, "<$0.0001"],
		[0.0001, "$0.0001"],
		[12.34567, "$12.3457"],
	])(
		"formats reported cost %s without making tiny positive charges look free",
		(cost, expected) => {
			expect(
				formatUsage({
					input: 0,
					output: 0,
					total: 0,
					cacheRead: 0,
					cacheWrite: 0,
					cost,
				}).summary,
			).toBe(`${expected} · 0 output`);
		},
	);
});

describe("structured human views", () => {
	it.each([
		[
			{ task: "integration", ownership: "ui-tests", files: ["a.ts"] },
			"integration",
		],
		[{ title: "Check boundary", detail: "long evidence" }, "Check boundary"],
		[{ summary: "Read\n source" }, "Read source"],
		['{"task":"Encoded task"}', "Encoded task"],
		[[{ task: "one" }, { task: "two" }], "2 items"],
		[
			{ nested: { x: 1 }, files: ["a", "b"], ready: true },
			"Nested: 1 field · Files: 2 items · Ready: true",
		],
		[{}, "0 fields"],
		[[], "0 items"],
		[null, "None"],
		[false, "false"],
		[0, "0"],
		[undefined, ""],
	])("summarizes %j without serializing it", (value, expected) => {
		expect(summarizeValue(value)).toBe(expected);
	});

	it("bounds long labels and indicates omitted fields", () => {
		expect(summarizeValue({ title: "x".repeat(200) })).toBe(
			`${"x".repeat(119)}…`,
		);
		expect(summarizeValue({ a: 1, b: 2, c: 3, d: 4 })).toContain("+1 fields");
	});

	it("renders nested fields, lists, multiline text, and empty values without dropping data", () => {
		const value = {
			answerStatus: "incomplete",
			findings: [
				{
					file: "src/a.ts",
					reason: "First line\nSecond line",
					verified: false,
				},
			],
			missing: null,
			names: ["one", "two"],
			empty_list: [],
			empty_object: {},
		};
		const before = JSON.stringify(value);
		const markdown = formatValueMarkdown(value);
		expect(markdown).toContain("- **Answer Status:** incomplete");
		expect(markdown).toContain(
			"- **Findings:**\n  - **Item 1**\n    - **File:** src/a.ts",
		);
		expect(markdown).toContain("- **Reason:** First line  \n      Second line");
		expect(markdown).toContain("- **Verified:** false");
		expect(markdown).toContain("- **Missing:** None");
		expect(markdown).toContain("- **Names:**\n  - one\n  - two");
		expect(markdown).toContain("- **Empty list:**\n  - No items");
		expect(markdown).toContain("- **Empty object:**\n  - No fields");
		expect(markdown).not.toContain('"answerStatus":');
		expect(JSON.stringify(value)).toBe(before);
	});

	it("renders serialized structured values inside fields and lists", () => {
		expect(formatValueMarkdown({ details: '{"ready":true}' })).toBe(
			"- **Details:**\n  - **Ready:** true",
		);
		expect(formatValueMarkdown(['```json\n{"ready":true}\n```'])).toBe(
			"- **Item 1**\n  - **Ready:** true",
		);
	});

	it("keeps field labels literal when they contain markdown syntax", () => {
		expect(formatValueMarkdown({ "*name*": "value" })).toBe(
			"- **\\*name\\*:** value",
		);
	});

	it.each(['{"ok":true}', '```json\n{"ok":true}\n```'])(
		"renders complete JSON text %s",
		(text) => {
			expect(formatStructuredText(text)).toBe("- **Ok:** true");
			expect(formatStructuredText(text, summarizeValue)).toBe("Ok: true");
		},
	);

	it.each([
		"ordinary **markdown**",
		'{"unfinished":',
		"source example: { not JSON }",
	])("preserves prose or incomplete JSON %s", (text) =>
		expect(formatStructuredText(text)).toBe(text),
	);
});