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diplomacy/engine/interfaces.ts

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+// diplomacy/engine/interfaces.ts
+
+import { PowerTs } from './power'; // For _unit_owner_cache if defined here
+import { DiplomacyMessage } from './message'; // For message history types
+
+// From diplomacy.utils.order_results
+export enum OrderResult {
+    OK = 'ok', // Assuming '' or OK from python is 'ok'
+    NO_CONVOY = 'no convoy',
+    BOUNCE = 'bounce',
+    VOID = 'void',
+    CUT = 'cut',
+    DISLODGED = 'dislodged',
+    DISRUPTED = 'disrupted',
+    DISBAND = 'disband',
+    MAYBE = 'maybe', // Used in intermediate steps
+    // Add any other results if they appear
+}
+
+// Placeholder for what DiplomacyMessage.toJSON() might return
+// This should align with the actual toJSON implementation in message.ts
+export interface DiplomacyMessageData {
+    phase: string;
+    sender: string;
+    recipient: string;
+    message: string;
+    time_sent?: number;
+    // any other fields from toJSON()
+}
+
+export interface GameStateHistoryEntry {
+    timestamp: number;
+    zobrist_hash: string;
+    note: string;
+    name: string; // short phase name e.g. S1901M
+    units: Record<string, string[]>; // { FRANCE: ["A PAR", "*F BRE"], ... }
+    retreats: Record<string, Record<string, string[]>>; // { FRANCE: { "F BRE": ["ENG", "MAO"] }, ... }
+    centers: Record<string, string[]>; // { FRANCE: ["PAR", "MAR"], ... }
+    homes: Record<string, string[]>;
+    influence: Record<string, string[]>;
+    civil_disorder: Record<string, number>; // Or boolean, depending on Python version
+    builds: Record<string, { count: number; homes: string[] }>;
+    phase: string; // long phase name
+}
+
+export interface SupportEntry {
+    count: number;
+    from: string[]; // list of units whose support does NOT count toward dislodgment
+}
+
+// Used in Game.combat
+// Format: {loc: { attack_strength: [ ['src loc unit', [supporting_unit_locs_not_counting_for_dislodgement]] ]}}
+// e.g. { 'MUN': { 1 : [ ['A MUN', [] ], ['A RUH', [] ] ], 2 : [ ['A SIL', ['A BOH']] ] } }
+export interface CombatSiteEntry {
+    [attackStrength: number]: Array<[string, string[]]>; // unit_name_at_src_loc, list_of_supporting_unit_locs
+}
+export type CombatTable = Record<string, CombatSiteEntry>; // loc_being_attacked_or_held
+
+/**
+ * Stores information about possible convoy paths based on current fleet locations.
+ * Used in `Game.convoy_paths_possible`.
+ */
+export interface PossibleConvoyPathInfo {
+    start: string;          // Starting location of the army
+    fleetsRequired: Set<string>; // Set of fleet locations required for this path segment
+    possibleDests: Set<string>;  // Set of destination locations reachable via these fleets from start
+}
+
+// Cache for _unit_owner
+// Key: unit string (e.g., "A PAR", "F STP/SC") or unit string without coast (e.g., "F STP")
+// Value: PowerTs instance or null
+export type UnitOwnerCache = Map<string, PowerTs | null>;
+
+// For Game.orders (mapping unit to its order string)
+export type UnitOrders = Record<string, string>;
+
+// For Game.ordered_units (mapping power name to list of its units that have orders)
+export type PowerOrderedUnits = Record<string, string[]>;
+
+// For Game.convoy_paths (mapping army unit to list of possible paths)
+// Each path is a list of locations: [start_loc, fleet1_loc, fleet2_loc, ..., end_loc]
+export type ConvoyPathsTable = Record<string, string[][]>;
+
+// For may_convoy variable in _resolve_moves
+// Maps an army unit (string) to a list of fleet locations (strings) that are involved in some valid path for it
+export type MayConvoyTable = Record<string, string[]>;
+
+// Structured Order Representation
+export interface ParsedOrder {
+    order_string: string;
+    is_valid_syntax: boolean;
+    validation_error?: string;
+
+    unit_power?: string;
+    unit_location?: string;
+    unit_type?: 'A' | 'F';
+
+    order_type?: 'H' | 'M' | 'S' | 'C' | 'B' | 'D' | 'W' | 'R'; // Hold, Move, Support, Convoy, Build, Disband, Waive, Retreat
+
+    // For Move orders
+    target_location?: string;
+    target_coast?: string;
+
+    // For Support orders
+    supported_unit_location?: string;
+    supported_unit_type?: 'A' | 'F';
+    support_target_location?: string;
+    support_target_coast?: string;
+
+    // For Convoy orders
+    convoyed_unit_location?: string;
+    convoyed_unit_type?: 'A' | 'F';
+    convoy_destination_location?: string;
+
+    // For Build orders
+    build_unit_type?: 'A' | 'F';
+
+    via_convoy?: boolean;
+
+    // For rule validation
+    is_valid_rule?: boolean;
+    rule_validation_error?: string;
+}