import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
import {
	effectiveIntegration,
	type ReinjectDeliveryMode,
	type SkillReinjectSettings,
} from "./settings";
import type { AutoCompactIntegration, RuntimeFlags } from "./state";

/** Detect @capyup/pi-auto-compact via public getCommands API (SPEC §16.4). */
export function detectPiAutoCompact(pi: ExtensionAPI): boolean {
	return pi.getCommands().some((command) => command.name === "auto-compact");
}

/** Detect pi-auto-compact and cache result in runtime flags (SPEC §16.4). */
export function detectAndCachePiAutoCompact(pi: ExtensionAPI, runtime: RuntimeFlags): boolean {
	runtime.autoCompactDetected = detectPiAutoCompact(pi);
	return runtime.autoCompactDetected;
}

/** Resolve re-inject delivery mode from settings, detect cache, and session override (SPEC §6.5.3). */
export function resolveDeliveryMode(
	settings: SkillReinjectSettings,
	runtime: RuntimeFlags,
	sessionIntegrationOverride?: AutoCompactIntegration | null,
): ReinjectDeliveryMode {
	return effectiveIntegration(settings, runtime.autoCompactDetected, sessionIntegrationOverride);
}

/** pi-auto-compact follow-up message prefixes (SPEC §16.9); documentation/tests only, not runtime v1. */
export const PI_AUTO_COMPACT_FOLLOW_UP_PREFIXES = [
	"Auto-compact ran before this turn.",
	"Auto-compact ran mid-turn.",
	"Emergency auto-compact ran.",
	"Auto-compact ran on session resume.",
] as const;