challenge rank field from progress model branch

src/module/fields/ChallengeRank.ts

@@ -0,0 +1,71 @@
+/** Represents a challenge rank, usually for a progress track. */
+export class ChallengeRank extends foundry.data.fields.NumberField {
+	/**
+	 * Enumerates challenge ranks.
+	 * @enum
+	 */
+	static readonly RANK = {
+		Troublesome: 1,
+		Dangerous: 2,
+		Formidable: 3,
+		Extreme: 4,
+		Epic: 5
+	} as const
+
+	static readonly MIN = this.RANK.Troublesome
+	static readonly MAX = this.RANK.Epic
+
+	static readonly i18nKeys = Object.fromEntries(
+		Object.entries(ChallengeRank.RANK).map(([key, numericValue]) => [
+			numericValue,
+			`IRONSWORN.CHALLENGERANK.${key}`
+		])
+	) as Record<ChallengeRank.Value, string>
+
+	static localizeValue(rank: ChallengeRank.Value) {
+		return game.i18n.localize(ChallengeRank.i18nKeys[rank])
+	}
+
+	constructor(
+		options?: Partial<
+			Omit<
+				foundry.data.fields.NumberField.Options,
+				'choices' | 'step' | 'integer' | 'max' | 'min' | 'positive'
+			>
+		>
+	) {
+		super({
+			label: 'IRONSWORN.ChallengeRank',
+			choices: ChallengeRank.i18nKeys,
+			initial: ChallengeRank.MIN as number,
+			integer: true,
+			min: ChallengeRank.MIN,
+			max: ChallengeRank.MAX,
+			...options
+		})
+	}
+
+	override _cast(value: unknown) {
+		switch (true) {
+			case value === 'formidible':
+				return ChallengeRank.RANK.Formidable
+			case typeof value === 'string':
+				return ChallengeRank.RANK[
+					(value as string).capitalize() as keyof typeof ChallengeRank.RANK
+				]
+			default: {
+				return super._cast(value)
+			}
+		}
+	}
+}
+export interface ChallengeRank extends foundry.data.fields.NumberField {
+	choices: {
+		[R in ChallengeRank.Value]: string
+	}
+}
+
+export namespace ChallengeRank {
+	/** A numeric challenge rank value. */
+	export type Value = ValueOf<(typeof ChallengeRank)['RANK']>
+}