// Domain types — the single source of truth shared by the frontend (src/), the
// backend (server/), and the LLM prompt contract. No runtime dependencies here.

/** A nation's 0–100 status indices. Every value is clamped to 0–100 by the engine. */
export interface NationStats {
  military: number;
  economy: number;
  stability: number;
  population: number;
}

export const STAT_KEYS = ['military', 'economy', 'stability', 'population'] as const;
export type StatKey = (typeof STAT_KEYS)[number];

export type NationType = 'major' | 'minor' | 'power' | 'alliance' | 'faction';

/** Direction of a bilateral diplomatic relationship. */
export type RelationStatus = 'ally' | 'neutral' | 'rival' | 'hostile' | 'war';

export const RELATION_STATUSES: RelationStatus[] = [
  'ally',
  'neutral',
  'rival',
  'hostile',
  'war',
];

/**
 * A single nation in the world. `territory` holds **region keys** (see
 * `public/region-keys.json`) — one per owned sub-region, so the choropleth can
 * color individual sub-regions, not whole countries (v0.19, #16 P1). The map
 * resolves each sub-region's owner by its region key (see protocol.mapFeatureOwner).
 */
export interface Nation {
  id: string;
  name: string;
  type: NationType;
  stats: NationStats;
  territory: string[];
  relations: Record<string, RelationStatus>;
}

/** Categories a narrative event can take. */
export type EventType =
  | 'military'
  | 'diplomatic'
  | 'economic'
  | 'political'
  | 'social'
  | 'disaster'
  | 'scientific'
  | 'cultural';

export const EVENT_TYPES: EventType[] = [
  'military',
  'diplomatic',
  'economic',
  'political',
  'social',
  'disaster',
  'scientific',
  'cultural',
];

export type EventOutcome = 'success' | 'failure' | 'partial' | 'neutral';

/** A narrative event the simulation emitted on some turn. */
export interface EventEntry {
  id: string;
  turn: number;
  date: string;
  nation: string; // nation id the event concerns
  type: EventType;
  title: string;
  text: string;
  outcome: EventOutcome;
}

/**
 * A single item queued in the current round, waiting to be committed by a
 * "Jump forward". `kind: 'action'` is a free-text player move; `kind:
 * 'diplomacy'` is a message to a specific nation (`to`).
 */
export type RoundItem = {
  kind: 'action' | 'diplomacy';
  text: string;
  to?: string;
};

/**
 * Monotonic revision counter for a game, bumped by the server on every
 * mutation (queue add/remove, turn commit) and persisted with the state.
 * Clients use it to tell a fresh state from a stale one: an SSE `state`/`turn`
 * snapshot (e.g. the on-connect resync) that arrives *after* a fresher REST
 * response carries a lower version and must be ignored, never applied
 * (see the client's "never go backwards" rule in src/App.tsx). Legacy games
 * saved before this field existed are treated as version 0 by consumers.
 */
export type GameVersion = number;

/** The full, persisted state of one game. Saved to SQLite by id. */
export interface GameState {
  id: string;
  presetId: string;
  presetTitle: string;
  playerNationId: string;
  turn: number;
  date: string;
  nations: Record<string, Nation>;
  events: EventEntry[];
  /**
   * Actions + diplomatic messages queued this round but not yet committed.
   * Adding an item never advances the turn; a "Jump forward" processes the whole
   * batch in a single turn and clears this back to `[]`.
   */
  pending: RoundItem[];
  /**
   * Monotonic revision counter (see GameVersion). Bumped on every mutation so
   * clients can reject stale SSE snapshots; see the "never go backwards" rule
   * in src/App.tsx. Starts at 1 on game creation.
   */
  version: GameVersion;
  /**
   * (v0.22, #16 P3) Region keys that became **unowned** — "no man's land" —
   * during play: a region that was owned and was released to no owner by a
   * committed turn (the LLM narrates the cause in that turn's events). This is
   * deliberately distinct from the many regions a preset never assigns, which
   * are also unowned but were never *released* mid-game; only the keys in this
   * list render as the distinct visible no-man's-land grey (see
   * protocol.regionFillStyle). A region leaves the list when any nation
   * re-claims it (an ordinary `gain`). Always `[]` on a fresh game — no
   * man's land can only arise mid-game. Rows saved before v0.22 load with
   * this defaulted to `[]` (see server/db.ts).
   */
  unowned: string[];
}

/**
 * A scenario the player can start. One JSON file per preset (presets/<id>.json).
 * `worldBackground` + `simulationRules` become the LLM system prompt.
 */
export interface Preset {
  id: string;
  title: string;
  startDate: string;
  summary: string;
  worldBackground: string;
  simulationRules: string[];
  nations: Nation[];
}

/** The lightweight manifest entry used to render the preset picker cards. */
export interface PresetMeta {
  id: string;
  title: string;
  startDate: string;
  summary: string;
}