// Domain types — the single source of truth shared by the frontend (src/), the
// backend (server/), and the LLM prompt contract. No runtime dependencies here.
// (The single `import type` below erases at compile time, so no runtime
// dependency on protocol.ts is introduced — see the GameState.pendingNationOps
// doc comment.)
import type { NationOp } from './protocol';

/** 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;
}

/**
 * (v0.28, #46) The 0–100 status indices of a **single region**. Per-region stats
 * are the unit of record: a nation's aggregate {@link NationStats} is derived as
 * the area×population-weighted median of the stats of the regions it owns (see
 * `protocol.deriveNationStats`). Every value is clamped to 0–100 by the engine.
 */
export interface RegionStats {
  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',
];

/**
 * The outcome of a narrative event. `success` / `failure` / `partial` /
 * `neutral` are the four the LLM is asked to emit. `repelled` (v0.30, #50) is
 * reserved for the engine: it is emitted automatically when the military hard
 * gate rejects a contested conquest (an invasion whose attacker was more than
 * `CONQUEST_MILITARY_MARGIN` below the defender) — the LLM never produces it,
 * and the client renders it in a distinct muted-red failure tone.
 */
export type EventOutcome = 'success' | 'failure' | 'partial' | 'neutral' | 'repelled';

// --- Map markers (v0.27, #44) -------------------------------------------------
//
// Named point markers the LLM can place on the map (cities, factories, armies,
// ports, capitals, fleets, rocket launch sites, political/social gatherings).
// A marker is anchored to a **region key** (see `public/region-keys.json`): the
// engine positions it at that region's precomputed centroid (with a small
// deterministic offset) and its `ownerNationId` follows the region's current
// owner (recomputed on every turn; `null` when the region is unowned / no
// man's land). See protocol.ts for the LLM-facing `TurnResult.markers`
// contract and the `markerId` derivation.

/** The eight marker categories the model may place (v0.27, #44). */
export type MarkerType =
  | 'city'
  | 'factory'
  | 'army'
  | 'port'
  | 'capital'
  | 'fleet'
  | 'rocket'
  | 'gathering';

/** All marker types, in canonical order (used by the LLM contract + map layer). */
export const MARKER_TYPES: MarkerType[] = [
  'city',
  'factory',
  'army',
  'port',
  'capital',
  'fleet',
  'rocket',
  'gathering',
];

/**
 * A named point marker on the map (v0.27, #44). `id` is a stable,
 * deterministic 4-character code derived from `type + name + regionKey`
 * (see protocol.markerId) — re-adding the same marker is idempotent and
 * removing by id is unambiguous. `lat`/`lon` are filled in by the engine from
 * the region's centroid manifest (never by the model); `ownerNationId` is the
 * marker's region's current owner (`null` when unowned) and is recomputed by
 * the engine on every committed turn, so a marker always follows its region.
 */
export interface MapMarker {
  id: string;
  type: MarkerType;
  name: string;
  regionKey: string;
  lat: number;
  lon: number;
  ownerNationId: string | null;
  placedTurn: number;
}

/**
 * (v0.33.0, #56) A first-class **war** — a named, ongoing armed conflict
 * between two or more nations. Unlike the boolean `war` relation (which a
 * preset or a bare `relations` entry can carry without any structure behind
 * it), a `War` is an explicit world entity the engine tracks: the LLM
 * declares it (a turn's `wars.declare`), the engine assigns it a stable id
 * (`w1`, `w2`, …), the turn and in-game date it was declared, and it stays in
 * `GameState.wars` for the rest of the game as history after it ends.
 *
 * **Semantics of `sides`:** the flat list of every belligerent in the war
 * (≥2 distinct nation ids). Any two distinct members of an active war's
 * sides are at war with each other — the engine derives the symmetric `war`
 * relation for every such pair on every turn (see the engine's
 * `syncWarRelations`), and downgrades the relation to `hostile` when the war
 * ends. A mutual-defense ally of a belligerent is dragged into the same list
 * on declaration (the engine does this automatically).
 */
export interface War {
  /** Stable id (`w1`, `w2`, …) assigned by the engine on declaration. */
  id: string;
  /** The belligerent nations (≥2 distinct ids; see the note above). */
  sides: string[];
  /** The turn number the war was declared on. */
  declaredTurn: number;
  /** The in-game date the war took effect on (`YYYY-MM-DD`). */
  declaredDate?: string;
  /** Optional short war aims the LLM names at declaration. */
  aims?: string[];
  /**
   * Lifecycle: `active` until a turn ends the war, then the end outcome —
   * `armistice` (a negotiated stop) or `capitulation` (one side surrenders) —
   * or the generic `ended`. Ended wars stay in `GameState.wars` as history.
   */
  status: 'active' | 'armistice' | 'capitulation' | 'ended';
  /** Optional region keys the war's front line runs through (reserved). */
  front?: string[];
}

/** 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[];
  /**
   * (v0.23, #16 P4a; v0.24, #16 P4b) Nation-management ops the LLM has
   * proposed but the player has not yet resolved: a *pending proposal* list,
   * as opposed to `pending` (the current round's queued player actions). A
   * turn NEVER applies one — `applyTurnResult` appends the turn's
   * `nationOps` to this list, and each proposal survives across turns until
   * the player resolves it: confirming applies it (a rename changes
   * `Nation.name` only; a split partitions the nation's region-key territory
   * into the new nations' territories; a merge folds the inputs' territory
   * into the survivor) and removes it; rejecting removes it without
   * applying. Always `[]` on a fresh game; rows saved before v0.23 load with
   * this defaulted to `[]` (see server/db.ts). (The `NationOp` type lives in
   * protocol.ts; the import there is type-only, so this file still has no
   * runtime dependencies.)
   */
  pendingNationOps: NationOp[];
  /**
   * (v0.27, #44) Named point markers on the map: the LLM places them (via a
   * turn's `markers.add`) and removes them (`markers.remove`, by id). The
   * engine positions each at its region's centroid (deterministic small
   * offset) and recomputes `ownerNationId` from the region's current owner on
   * EVERY committed turn (a released region → `null`). Always `[]` on a fresh
   * game; rows saved before v0.27 load with this defaulted to `[]` (see
   * server/db.ts) — additive, no data wipe. Capped at protocol.MAX_MARKERS.
   */
  markers: MapMarker[];
  /**
   * (v0.28, #46) Per-region stats, keyed by **region key** (see
   * `public/region-keys.json`): each owned region carries its own four 0–100
   * stats, and a nation's aggregate `Nation.stats` is the area×population-
   * weighted median of the regions it owns (see `protocol.deriveNationStats`).
   * A region that ends a turn **unowned** (released to no man's land) has NO
   * entry, and a preset-unassigned region (never owned) has none until first
   * claimed (re-claiming re-inits it to the gainer's stats). Always present on a
   * fresh game (every owned region seeded with its owner's initial stats); a
   * legacy SQLite row without the field is migrated at load (see server/db.ts)
   * — additive, no data wipe.
   */
  regionStats: Record<string, RegionStats>;
  /**
   * (v0.33.0, #56) First-class war entities (see {@link War}): declared by a
   * turn's `wars.declare` (the engine assigns the id, declared turn/date, and
   * drags in mutual-defense allies) and closed by `wars.end` (armistice /
   * capitulation). The engine DERIVES the `war` relation from the ACTIVE
   * wars on every turn (two nations are in a `war` relation iff they are both
   * belligerents of ≥1 active war), so the boolean relation and the war
   * entities can never drift apart. A bare preset `war` relation with no
   * active war behind it stays as-is (an implicit, unnamed war — never
   * force-created into an entity). Always `[]` on a fresh game; rows saved
   * before v0.33 load with this defaulted to `[]` (see server/db.ts) —
   * additive, no data wipe.
   */
  wars: War[];
}

/**
 * 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;
}