export type TaskKind = "simple" | "explanation" | "bugfix" | "feature" | "refactor" | "debugging" | "architecture" | "research";

export type ModelProfile = "fast" | "balanced" | "advanced";

export type ThinkingLevel = "off" | "minimal" | "low" | "medium" | "high" | "xhigh" | "max";

export interface Classification {
  kind: TaskKind;
  score: number;
  reasons: string[];
}

export interface RepositorySignals {
  projectRoot?: string;
  fileCount?: number;
  languageMix?: Readonly<Record<string, number>>;
  diffSize?: number;
  promptFileCount?: number;
}

export interface PromptSignals {
  mentionedFileCount: number;
}

export interface AvailableModel {
  id: string;
  name?: string;
}

export interface RouterConfig {
  enabled: boolean;
  models: Record<ModelProfile, string>;
  defaultThinking: ThinkingLevel;
  advancedThreshold: number;
  hysteresis: number;
  switchPolicy: "stable" | "always";
  debug: boolean;
}

export interface RouteState {
  profile: ModelProfile;
  model?: string;
  thinking: ThinkingLevel;
  score: number;
}

export interface SessionState {
  current?: RouteState;
  taskBoundary?: boolean;
}

export interface RouteOverride {
  profile?: ModelProfile;
  model?: string;
  thinking?: ThinkingLevel;
}

export interface RouteInput {
  prompt: string;
  repository?: RepositorySignals;
  config?: RouterConfig;
  availableModels?: readonly AvailableModel[];
  currentModel?: string;
  session?: SessionState;
  override?: RouteOverride;
}

export interface RouteDecision extends RouteState {
  kind: TaskKind;
  reasons: string[];
  fallback: boolean;
  overridden: boolean;
}

export interface ConfigResult {
  config: RouterConfig;
  warnings: string[];
}