// 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 **sub-region ids** (e.g.
 * `FR-57`) — one entry per individually-ownable sub-region, at sub-region
 * granularity rather than whole-country ISO_A3. The map colors each sub-region
 * with this nation's stable color (see protocol.nationColor). At scenario start
 * a nation owns **all** sub-regions of the countries it holds (the server
 * expands each ISO_A3 to its sub-regions; see server/regions.expandTerritory),
 * so no region starts unowned. A sub-region that is in **no** nation's list is
 * unowned (no-man's-land) — the map renders it grey and it can be gained or
 * lost region-by-region by the LLM.
 */
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;
}

/**
 * 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;
}