import type { ChatRequestMessage } from '@portfolio/chat-contract';

export type ChatPostBody = { messages?: ChatRequestMessage[]; responseAnchorId?: string; reasoningEnabled?: boolean; conversationId?: string; };

type ValidationError = { ok: false; error: string; status: number }; type ValidationSuccess = { ok: true; value: { messages: ChatRequestMessage[]; responseAnchorId: string; reasoningEnabled?: boolean; conversationId: string; }; };

export function resolveReasoningEnabled(options: { requested?: boolean; environment?: string | undefined }): boolean { // Simplified: only emit reasoning when the request explicitly asked for it. return Boolean(options.requested); }

export function validateChatPostBody(body: ChatPostBody | null | undefined): ValidationError | ValidationSuccess { const messages = Array.isArray(body?.messages) ? body!.messages : []; if (!messages.length) { return { ok: false, error: 'No messages provided.', status: 400 }; }

const conversationId = typeof body?.conversationId === 'string' && body.conversationId.trim().length > 0 ? body.conversationId.trim() : null; if (!conversationId) { return { ok: false, error: 'Missing conversationId.', status: 400 }; }

const responseAnchorId = typeof body?.responseAnchorId === 'string' && body.responseAnchorId.trim().length > 0 ? body.responseAnchorId.trim() : null; if (!responseAnchorId) { return { ok: false, error: 'Missing responseAnchorId.', status: 400 }; }

return { ok: true, value: { messages, responseAnchorId, reasoningEnabled: typeof body?.reasoningEnabled === 'boolean' ? body.reasoningEnabled : undefined, conversationId, }, }; }