import { beforeAll, describe, expect, it, vi } from "bun:test";
import type { UsageReport } from "@oh-my-pi/pi-ai";
import { CommandController } from "@oh-my-pi/pi-coding-agent/modes/controllers/command-controller";
import { getThemeByName, setThemeInstance } from "@oh-my-pi/pi-coding-agent/modes/theme/theme";
import type { InteractiveModeContext } from "@oh-my-pi/pi-coding-agent/modes/types";

interface RenderableBlock {
	render(width: number): string[];
}

function isRenderableBlock(value: unknown): value is RenderableBlock {
	return value !== null && typeof value === "object" && "render" in value && typeof value.render === "function";
}

function renderPresentedBlocks(value: unknown): string {
	const blocks = Array.isArray(value) ? value : [value];
	return blocks
		.filter(isRenderableBlock)
		.flatMap(block => block.render(120))
		.join("\n");
}

describe("CommandController /usage", () => {
	beforeAll(async () => {
		const theme = await getThemeByName("dark");
		if (!theme) throw new Error("Expected dark theme");
		setThemeInstance(theme);
	});

	it("renders bars and free percentage for limits that only report remainingFraction", async () => {
		const present = vi.fn();
		const ctx = {
			session: {},
			ui: { terminal: { columns: 100 } },
			present,
			showWarning: vi.fn(),
			showError: vi.fn(),
		} as unknown as InteractiveModeContext;
		const controller = new CommandController(ctx);
		const reports: UsageReport[] = [
			{
				provider: "openai-codex",
				fetchedAt: 1_700_000_000_000,
				limits: [
					{
						id: "codex-weekly",
						label: "Weekly",
						scope: { provider: "openai-codex", tier: "pro", accountId: "acct-1" },
						window: { id: "weekly", label: "weekly" },
						amount: { remainingFraction: 0.25, unit: "requests" },
						status: "ok",
					},
				],
				metadata: { email: "user@example.com" },
			},
		];

		await controller.handleUsageCommand(reports);

		expect(present).toHaveBeenCalledTimes(1);
		const firstCall = present.mock.calls[0];
		expect(firstCall).toBeDefined();
		const output = renderPresentedBlocks(firstCall?.[0]);
		expect(output).toContain("25% free");
		expect(output).toContain("█");
		expect(output).not.toContain("··········");
	});

	it("renders saved reset expiry lines for future and expired credits", async () => {
		const present = vi.fn();
		const ctx = {
			session: {},
			ui: { terminal: { columns: 100 } },
			present,
			showWarning: vi.fn(),
			showError: vi.fn(),
		} as unknown as InteractiveModeContext;
		const controller = new CommandController(ctx);
		const now = Date.now();
		const dayMs = 24 * 60 * 60 * 1000;
		const futureIso = new Date(now + 2 * dayMs).toISOString();
		const expiredIso = new Date(now - 2 * dayMs).toISOString();
		const reports: UsageReport[] = [
			{
				provider: "openai-codex",
				fetchedAt: now,
				limits: [],
				metadata: { email: "user@example.com" },
				resetCredits: {
					availableCount: 2,
					credits: [{ expiresAt: futureIso }, { expiresAt: expiredIso }],
				},
			},
		];

		await controller.handleUsageCommand(reports);

		expect(present).toHaveBeenCalledTimes(1);
		const firstCall = present.mock.calls[0];
		expect(firstCall).toBeDefined();
		const output = renderPresentedBlocks(firstCall?.[0]);
		expect(output).toContain("Saved rate-limit resets");
		expect(output).toContain("user@example.com: 2 saved resets");
		expect(output).toContain(`expires in`);
		expect(output).toContain(`(${futureIso.slice(0, 10)})`);
		expect(output).toContain(`expired (${expiredIso.slice(0, 10)})`);
	});
});