/**
 * Pure state machine for the rich questionnaire form.
 *
 * Keeping keyboard intent and answer collection separate from PI's TUI makes the interaction contract
 * directly testable: a multi-page form completes only from its final Submit page, and Space toggles a
 * checkbox without leaving the current question.
 */
import type { Question, Questionnaire, QuestionOption } from "../flow/questionnaire.ts";
import { type RawSelection } from "./answer-assembly.ts";
export type FormEvent = {
    kind: "key-up";
} | {
    kind: "key-down";
} | {
    kind: "navigate";
    delta: -1 | 1;
    text?: string;
} | {
    kind: "key-enter";
} | {
    kind: "key-escape";
} | {
    kind: "key-space";
} | {
    kind: "editor-submit";
    value: string;
};
export type FormEffect = {
    kind: "render";
} | {
    kind: "editor-set-text";
    text: string;
} | {
    kind: "done";
    cancelled: boolean;
};
export interface FormState {
    readonly questionnaire: Questionnaire;
    readonly currentPage: number;
    readonly optionIndex: number;
    readonly inputMode: boolean;
    readonly answers: ReadonlyMap<string, RawSelection>;
}
export interface FormTransition {
    readonly state: FormState;
    readonly effects: FormEffect[];
}
type RenderOption = QuestionOption & {
    readonly isOther?: boolean;
};
export declare function initialFormState(questionnaire: Questionnaire): FormState;
export declare function currentFormQuestion(state: FormState): Question | undefined;
export declare function currentFormOptions(state: FormState): RenderOption[];
export declare function isSubmitPage(state: FormState): boolean;
export declare function allQuestionsAnswered(state: FormState): boolean;
export declare function formAnswers(state: FormState): Record<string, unknown>;
export declare function reduceForm(state: FormState, event: FormEvent): FormTransition;
export {};
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