import type { NoteVisibilityValue } from "./NoteVisibilitySelect.tsx";

/**
 * WHAT AN INTERNAL NOTE STILL NEEDS BEFORE IT CAN BE SAVED, in the author's words.
 *
 * THE BUTTON AND THE SENTENCE COME FROM ONE LIST, deliberately. A disabled control and a message
 * explaining it are two statements about the same rule, and two statements drift: the note composer
 * had the rule and not the message, so Save sat dead with no title, no message and no marker on the
 * control it was waiting for. An author could type a note, look at a greyed button, and have nothing
 * on screen tell them that choosing an audience was the missing step.
 *
 * The clinical note on the same encounter already does this properly - accepting a coded proposal
 * opens a form headed "STILL NEEDED 2" that names the outstanding fields rather than marking itself
 * invalid. Two note types, one screen, and only one of them said what it wanted.
 *
 * PHRASED AS THE THING, NOT THE FIELD. "Who can see it" is what the author is being asked for;
 * "visibility.mode" is what the code calls it, and nobody types a mode.
 */

/** No organization means no picker on screen, so there is no audience to ask for. */
export const newNoteRequirements = (
    body: string,
    visibility: NoteVisibilityValue,
    hasOrg: boolean,
): readonly string[] => {
    const missing: string[] = [];

    if (body.trim().length === 0) {
        missing.push("something in the note");
    }

    // With no picker rendered there is no choice to make, and requiring one would leave an org-less
    // author staring at a permanently disabled Save with nothing to click that would enable it.
    if (hasOrg && visibility.mode === "") {
        missing.push("who can see it");
    }

    // Choosing "Specific role categories" and naming none is an audience of nobody, which is a
    // different mistake from not having chosen at all and reads better said separately.
    if (visibility.mode === "roles" && visibility.categoryLabels.length === 0) {
        missing.push("at least one role category");
    }

    return missing;
};

/**
 * The list read out loud: "a and b", "a, b and c".
 *
 * An Oxford-comma-free join because this is a sentence fragment under a button rather than prose,
 * and the list is never longer than three.
 */
export const describeRequirements = (missing: readonly string[]): string => {
    if (missing.length === 0) return "";
    if (missing.length === 1) return missing[0];
    return `${missing.slice(0, -1).join(", ")} and ${missing[missing.length - 1]}`;
};