/**
 * mechanicus-status-line — adds a dark-mechanicum flavor line to pi's
 * footer via ctx.ui.setStatus.
 *
 * The default footer auto-renders registered extension statuses on a third
 * line below the cwd + stats. We register one key ("mechanicus") and rotate
 * its value on each turn_end so the line changes after every assistant
 * response. On session_start the status is seeded with a random entry so
 * it's present from the first render.
 *
 * Colour: warning (gilded gold) prefix glyph + muted (aged bronze) body.
 */

import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
import { readExtensionBooleanSetting } from "../shared/pi-settings.js";

const STATUSES = [
	"HERETEK FORGE · ACTIVE",
	"VASHTORR NETWORK · ONLINE",
	"SCRAPCODE CIRCUITRY · OPERATIONAL",
	"BLOOD-FORGE · CYCLING",
	"BINARY CANT · CORRUPTED",
	"DAEMON-MACHINE INTERFACE · STABLE",
	"COGITATOR · HUNGERING",
	"WARP CURRENTS · CHANNELING",
	"TECH-RITE · IN PROGRESS",
	"MACHINE-SPIRIT · POSSESSED",
	"SOUL-HARVEST · IMMINENT",
	"RITE OF CORRUPTION · OBSERVED",
	"NURGLE'S ROT · PERMEATING",
	"CHAOS ASCENDANT",
	"OMNISSIAH IS WEAK",
];

function pick<T>(arr: readonly T[]): T {
	return arr[Math.floor(Math.random() * arr.length)]!;
}

const EXTENSION_NAME = "dark-mechanicus";

function readStatusLineEnabled(): boolean {
	return readExtensionBooleanSetting(EXTENSION_NAME, "statusLineEnabled", true);
}

export default function (pi: ExtensionAPI) {
	const applyStatus = (ctx: any, body?: string) => {
		if (!ctx.hasUI) return;
		if (!readStatusLineEnabled()) {
			ctx.ui.setStatus("mechanicus", undefined);
			return;
		}
		const text = body ?? pick(STATUSES);
		const theme = ctx.ui.theme;
		const line = `${theme.fg("warning", "⚙")} ${theme.fg("muted", text)}`;
		ctx.ui.setStatus("mechanicus", line);
	};

	pi.on("session_start", async (_event, ctx) => {
		applyStatus(ctx);
	});

	// Rotate after every assistant response so the line feels alive but not
	// frantic. Between turns the last value persists.
	pi.on("turn_end", async (_event, ctx) => {
		applyStatus(ctx);
	});

	pi.registerCommand("mechanicus-status-cycle", {
		description: "Force a new mechanicum status line immediately",
		handler: async (_args, ctx) => {
			if (!readStatusLineEnabled()) {
				ctx.ui.notify("mechanicus status line is disabled in settings.", "info");
				return;
			}
			applyStatus(ctx);
			ctx.ui.notify("Status re-transmuted.", "info");
		},
	});
}