/**
 * footer.test.ts — unit tests for the pipeline-overview footer (task: footer).
 *
 * The footer is presentation-only state: with no UI it tracks items but writes
 * nothing; with a stub UI it renders one status line and clears on `done()`.
 * These tests exercise the state machine (cursor demotion, terminal marks)
 * without spinning up a runner.
 */
import { describe, expect, it } from "bun:test";
import {
	createPipelineFooter,
	footerPhaseItems,
	FOOTER_GLYPH,
	FOOTER_STATUS_KEY,
	type ItemStatus,
} from "../src/footer.js";
import { PHASE_LABELS } from "../src/phases.js";
import { PHASE_ANALYSIS, PHASE_FIX, PHASE_RECON } from "../src/run-state.js";

/** Minimal UI stub capturing `setStatus(key, text)` calls in order. */
function stubUi(): {
	ui: { setStatus: (key: string, text: string | undefined) => void };
	calls: { key: string; text: string | undefined }[];
} {
	const calls: { key: string; text: string | undefined }[] = [];
	return {
		calls,
		ui: {
			setStatus(key, text) {
				calls.push({ key, text });
			},
		},
	};
}

/** Build the canonical phase-id list a scan-only check uses. */
function scanPhaseIds(): string[] {
	return [PHASE_RECON, PHASE_ANALYSIS, PHASE_FIX];
}

describe("createPipelineFooter", () => {
	it("is a no-op without a UI but still tracks item state", () => {
		// hasUI false: setStatus must never be called.
		const footer = createPipelineFooter({ hasUI: false });
		footer.setPipeline("pygienium smoke", [
			{ label: "Recon", status: "pending" },
		]);
		footer.setCursor(0);
		footer.done();
		// No UI → no observable side effect, but getItems reflects state.
		expect(footer.getItems()[0]?.status).toBe("running");
		expect(footer.getTitle()).toBe("pygienium smoke");
	});

	it("renders the full pipeline with the cursor running and clears on done", () => {
		const { ui, calls } = stubUi();
		const footer = createPipelineFooter({ ui, hasUI: true });
		const items = footerPhaseItems(scanPhaseIds(), PHASE_LABELS);

		footer.setPipeline("pygienium smoke", items, 0);

		// One setStatus call, under the canonical key, listing every phase:
		// cursor gets `▶ <label>`, the rest are glued `…<label>`.
		expect(calls).toHaveLength(1);
		expect(calls[0]?.key).toBe(FOOTER_STATUS_KEY);
		expect(calls[0]?.text).toContain("pygienium smoke");
		expect(calls[0]?.text).toContain(`${FOOTER_GLYPH.running} Recon`);
		expect(calls[0]?.text).toContain(`${FOOTER_GLYPH.pending}Scanning`);
		expect(calls[0]?.text).toContain(`${FOOTER_GLYPH.pending}Fixing`);
		// The cursor item is marked running.
		expect(footer.getItems()[0]?.status).toBe("running");

		footer.done();
		// done() pushes an undefined to clear the slot, then resets state.
		const last = calls[calls.length - 1];
		expect(last?.text).toBeUndefined();
		expect(footer.getItems()).toHaveLength(0);
	});

	it("demotes the previous running item to pending when the cursor moves", () => {
		const { ui } = stubUi();
		const footer = createPipelineFooter({ ui, hasUI: true });
		footer.setPipeline(
			"pygienium smoke",
			footerPhaseItems(scanPhaseIds(), PHASE_LABELS),
			0,
		);
		// recon → complete, then advance to analysis.
		footer.setItem(0, "complete");
		footer.setCursor(1);

		const items = footer.getItems();
		expect(items[0]?.status).toBe("complete");
		expect(items[1]?.status).toBe("running");
	});

	it("does not demote a terminal item when the cursor advances past it", () => {
		const { ui } = stubUi();
		const footer = createPipelineFooter({ ui, hasUI: true });
		footer.setPipeline(
			"pygienium smoke",
			footerPhaseItems(scanPhaseIds(), PHASE_LABELS),
			0,
		);
		footer.setCursor(0); // recon running
		// Simulate analysis completing (cursor was already moved there) then
		// jumping to fix: a completed phase must stay complete, not revert.
		footer.setItem(0, "complete");
		footer.setCursor(1); // analysis running
		footer.setItem(1, "complete");
		footer.setCursor(2); // fix running
		const items = footer.getItems();
		expect(items[0]?.status).toBe("complete");
		expect(items[1]?.status).toBe("complete");
		expect(items[2]?.status).toBe("running");
	});

	it("marks a skipped gate as every item skipped", () => {
		const { ui } = stubUi();
		const footer = createPipelineFooter({ ui, hasUI: true });
		footer.setPipeline(
			"pygienium comments",
			footerPhaseItems(scanPhaseIds(), PHASE_LABELS),
		);
		// No cursor: all pending. Now a gate-skip marks every phase skipped,
		// mirroring the runner's gate branch.
		for (let i = 0; i < footer.getItems().length; i++) {
			footer.setItem(i, "skipped" as ItemStatus);
		}
		expect(footer.getItems().every((it) => it.status === "skipped")).toBe(true);
	});

	it("can be disabled so it never touches the status slot", () => {
		const { ui, calls } = stubUi();
		const footer = createPipelineFooter({
			ui,
			hasUI: true,
			enabled: false,
		});
		footer.setPipeline("pygienium smoke", [
			{ label: "Recon", status: "pending" },
		]);
		footer.setCursor(0);
		footer.done();
		// enabled:false suppresses every setStatus call (used by /pygienium-all
		// which owns its own footer).
		expect(calls).toHaveLength(0);
	});

	it("writes under a custom status key (all-run owns its slot)", () => {
		const { ui, calls } = stubUi();
		const footer = createPipelineFooter({
			ui,
			hasUI: true,
			statusKey: "pygienium-all",
		});
		footer.setPipeline(
			"pygienium: all",
			[
				{ label: "comments", status: "pending" },
				{ label: "dead-code", status: "pending" },
			],
			0,
		);
		expect(calls[0]?.key).toBe("pygienium-all");
		expect(calls[0]?.text).toContain("pygienium: all");
		// Cursor on the first check; second still pending (to come).
		expect(calls[0]?.text).toContain(`${FOOTER_GLYPH.running} comments`);
		expect(calls[0]?.text).toContain(`${FOOTER_GLYPH.pending}dead-code`);
	});
});

describe("footerPhaseItems", () => {
	it("maps phase ids to pending footer items using PHASE_LABELS", () => {
		const items = footerPhaseItems(scanPhaseIds(), PHASE_LABELS);
		expect(items.map((i) => i.label)).toEqual(["Recon", "Scanning", "Fixing"]);
		expect(items.every((i) => i.status === "pending")).toBe(true);
	});

	it("falls back to the raw id for unknown phases", () => {
		const items = footerPhaseItems(["custom"], PHASE_LABELS);
		expect(items[0]?.label).toBe("custom");
	});
});