import { Type } from "typebox";


export const NEW_SESSION_CLARIFICATION_KICKOFF =
	"2. Nel primo turno identifica la SOLA ambiguità con maggiore impatto sulla query e " +
	"chiama subito `reviewer_select` con opzioni concrete. Niente lunga narrazione, elenco " +
	"di tutte le ambiguità o ricapitolazione preliminare.\n";


export const EMPTY_SESSION_CLARIFICATION_KICKOFF =
	"Se la sessione e' in fase 1 e non ha decisioni, dopo `session show` chiama " +
	"`reviewer_select` subito: non produrre testo libero.\n";


function normalizedAssumptions(assumptions) {
	let normalized = assumptions;
	if (typeof normalized === "string") {
		try {
			normalized = JSON.parse(normalized);
		} catch {
			normalized = [normalized];
		}
	}
	return Array.isArray(normalized) ? normalized.map(String) : [];
}


function prepareClarificationArguments(input) {
	if (!input || typeof input !== "object") return input;
	const args = { ...input };
	if (typeof args.options === "string") {
		try {
			const parsed = JSON.parse(args.options);
			if (Array.isArray(parsed)) args.options = parsed;
		} catch {
			// Preserve non-JSON input for the TypeBox/tool validation path.
		}
	}
	return args;
}


function decisionRecordedText(decision, option) {
	return (
		`Decisione registrata (${decision.type}): ${option.label}. ` +
		"Ora rileggi lo stato persistito con `tht session show` e invoca immediatamente " +
		"il prossimo tool reviewer_ richiesto dal workflow. " +
		"Non scrivere analisi o spiegazioni visibili."
	);
}


function validateClarificationOptions(ctx, options, session, workflow) {
	const known = workflow.decisionTypes(ctx);
	if (!known) return null;
	for (const option of options) {
		if (option.decision && !known.has(option.decision.type)) {
			return (
				`Tipo di decisione '${option.decision.type}' non valido. Tipi ammessi: ` +
				`${[...known].join(", ")}. Correggi e riprova.`
			);
		}
	}
	const current = workflow.phase(ctx, session).number;
	const minimumPhases = workflow.decisionMinimumPhases(ctx);
	for (const option of options) {
		const type = option.decision?.type;
		if (type && minimumPhases[type] && minimumPhases[type] > current) {
			return (
				`Tipo '${type}' ammesso dalla Fase ${minimumPhases[type]}, ` +
				`sessione alla Fase ${current}. Chiudi prima la fase corrente.`
			);
		}
	}
	return null;
}


function prepareClarification(
	ctx,
	params,
	id,
	{ workflow, reviewer, toTextResult },
) {
	const { session, title, options, intro, advance } = params;
	const validationError = validateClarificationOptions(ctx, options, session, workflow);
	if (validationError) return { result: toTextResult(validationError) };
	const phase = workflow.describe(ctx, session);
	const recommended = options.find((option) => option.recommended)?.id ?? null;
	return {
		session,
		options,
		advance,
		widget: reviewer.buildSelect({
			id,
			phase,
			title,
			intro: intro ?? null,
			recommended,
			options: options
				.filter((option) => !reviewer.isReserved(option.label))
				.map((option) => ({ id: option.id, label: option.label })),
		}),
	};
}


function resolveClarification(prepared, response) {
	if (response?.control === "freetext") {
		return { text: `Altro (reviewer): ${response.text}` };
	}
	if (response?.control === "back") {
		return { text: "Il reviewer vuole tornare indietro." };
	}
	if (response?.control === "exit") {
		return { text: "Il reviewer vuole uscire." };
	}
	const choice = Array.isArray(response?.choices) ? response.choices[0] : response?.choice;
	const option = (prepared.options || []).find((candidate) => candidate.id === choice) || null;
	if (option?.decision) {
		return {
			decision: option.decision,
			text: decisionRecordedText(option.decision, option),
		};
	}
	return { text: `Scelta del reviewer: ${option ? option.label : choice}` };
}


function installDisambiguationGate(
	pi,
	{ workflow, session, ledger, toTextResult },
) {
	// Compatibility: tool schema, labels and messages move verbatim from the
	// composition root; this extraction changes ownership, not Pi behavior.
	pi.registerTool({
		name: "rewrite_question",
		label: "Riscrittura domanda e chiusura F3 (deterministica)",
		description:
			"In Fase 3 scrive deterministicamente question.md, registra question_rewritten e " +
			"chiude la fase senza chiedere conferma al reviewer. assumptions puo' essere array " +
			"o stringa JSON.",
		parameters: Type.Object({
			session: Type.String(),
			question: Type.String(),
			assumptions: Type.Optional(Type.Any()),
		}),
		async execute(_id, params, _signal, _onUpdate, ctx) {
			workflow.activate();
			try {
				const { session: sessionId, question } = params;
				const current = workflow.phase(ctx, sessionId);
				if (current.number !== 3) {
					return toTextResult("La riscrittura automatica e' disponibile solo in Fase 3.");
				}
				// `tht session set-question` takes the session id as a positional argument
				// (unlike phase/cte/decision, which use --session).
				const args = ["set-question", sessionId, "--question", question];
				for (const assumption of normalizedAssumptions(params.assumptions)) {
					args.push("--assumption", assumption);
				}
				const mutationError = session.mutate(ctx, args, "");
				if (mutationError) return mutationError;
				const decisionError = ledger.record(ctx, sessionId, {
					type: "question_rewritten",
					subject: "domanda",
					detail: question,
				}, "");
				if (decisionError) return decisionError;
				const advanced = workflow.advance(ctx, sessionId, current.number);
				if (advanced.err) return advanced.err;
				return toTextResult(
					`Domanda riscritta e Fase 3 completata (sessione ${sessionId}).`,
				);
			} catch (fatal) {
				const message = (fatal.stderr || fatal.message || String(fatal)).toString().trim();
				return toTextResult(
					`[rewrite_question ERRORE INTERNO] ${message}. Riprova o usa un approccio diverso.`,
				);
			}
		},
	});
}


export function createDisambiguationGate(dependencies) {
	return {
		install: (pi) => installDisambiguationGate(pi, dependencies),
		prepareClarificationArguments,
		prepareClarification: (ctx, params, id) =>
			prepareClarification(ctx, params, id, dependencies),
		resolveClarification,
	};
}