// ─── App Mode ────────────────────────────────────────────────────────────────

export type AppMode = 'classroom' | 'homework';

// ─── Response Mode ──────────────────────────────────────────────────────────

export interface ResponseMode {
  hintMode: boolean; // true = AI proactively suggests hints
  strict: boolean;   // true = only the exact required approach is accepted
}

// ─── Languages & Topics ────────────────────────────────────────────────────

export type SupportedLanguage = 'python' | 'html';

export interface Topic {
  id: string;
  label: string;
  language: SupportedLanguage;
  description: string;
  starterCode: string;
}

// ─── Tasks (AI generated) ──────────────────────────────────────────────────

export interface Task {
  title: string;
  description: string;
  hints: string[];
  starterCode: string;
}

// ─── Messages ──────────────────────────────────────────────────────────────

export type MessageRole = 'user' | 'assistant';
export type MessageType = 'task' | 'review' | 'chat';

export interface Message {
  id: string;
  role: MessageRole;
  content: string;
  timestamp: number;
  type: MessageType;
}

// ─── Provider Config ───────────────────────────────────────────────────────

export type ProviderId = 'anthropic' | 'openrouter' | 'lmstudio' | 'ollama';

export interface ProviderConfig {
  provider: ProviderId;
  model: string;
  apiKey?: string;   // Anthropic key override or OpenRouter key
  baseUrl?: string;  // LM Studio / Ollama custom host:port
}

// ─── AI API ────────────────────────────────────────────────────────────────

export type AIMode = 'generate_task' | 'review_code' | 'chat' | 'generate_lesson' | 'classroom_chat';

export interface AIRequestBody {
  mode: AIMode;
  topic: Topic;
  code: string;
  executionResult?: ExecutionResult;
  messages: Pick<Message, 'role' | 'content'>[];
  userMessage?: string;
  providerConfig: ProviderConfig;
  responseMode?: ResponseMode;
}

// ─── Code Execution ────────────────────────────────────────────────────────

export interface ExecutionResult {
  stdout: string;
  stderr: string;
  exitCode: number;
  timedOut: boolean;
  error?: string;
}

export interface ExecuteRequestBody {
  language: SupportedLanguage;
  code: string;
  stdin?: string;
}

// ─── App State (useReducer) ────────────────────────────────────────────────

export type AppPhase =
  | 'selecting'
  | 'loading_task'
  | 'ready'
  | 'executing'
  | 'reviewing';

export interface AppState {
  phase: AppPhase;
  appMode: AppMode;
  topic: Topic | null;
  task: Task | null;
  code: string;
  messages: Message[];
  classroomMessages: Message[];
  lessonContent: string | null;
  executionResult: ExecutionResult | null;
  streamingContent: string;
  isStreaming: boolean;
  error: string | null;
  responseMode: ResponseMode;
}

// ─── Auth ───────────────────────────────────────────────────────────────────

export interface AuthUser {
  id: string;
  email: string;
}

// ─── App Actions ───────────────────────────────────────────────────────────

export type AppAction =
  | { type: 'SELECT_TOPIC'; payload: Topic }
  | { type: 'TASK_STREAM_START' }
  | { type: 'TASK_STREAM_CHUNK'; payload: string }
  | { type: 'TASK_STREAM_DONE'; payload: Task }
  | { type: 'CODE_CHANGE'; payload: string }
  | { type: 'EXECUTE_START' }
  | { type: 'EXECUTE_DONE'; payload: ExecutionResult }
  | { type: 'REVIEW_START' }
  | { type: 'STREAM_CHUNK'; payload: string }
  | { type: 'STREAM_DONE'; payload: Message }
  | { type: 'SEND_USER_MESSAGE'; payload: string }
  | { type: 'SET_APP_MODE'; payload: AppMode }
  | { type: 'LESSON_STREAM_START' }
  | { type: 'LESSON_STREAM_DONE'; payload: string }
  | { type: 'SEND_CLASSROOM_MESSAGE'; payload: string }
  | { type: 'CLASSROOM_MESSAGE_DONE'; payload: Message }
  | { type: 'SET_ERROR'; payload: string }
  | { type: 'CLEAR_ERROR' }
  | { type: 'SET_RESPONSE_MODE'; payload: Partial<ResponseMode> }
  | { type: 'RESET' }
  | {
      type: 'RESTORE_SESSION';
      payload: {
        topic: Topic;
        task: Task;
        code: string;
        messages: Message[];
        executionResult: ExecutionResult | null;
      };
    };