import { Session, startAgent, ExtensionConfig } from './api';
import { DEFAULT_CHAT_TITLE } from './contexts/ChatContext';
import type { setViewType } from './hooks/useNavigation';
import type { FixedExtensionEntry } from './components/ConfigContext';
import { AppEvents } from './constants/events';
import { USE_ACP_CHAT } from './acpChatFeatureFlag';
import { acpChatSessionController } from './acp/chatSessionController';
import { getConfiguredGooseExtensions, gooseExtensionName } from './acp/extensions';

export function getSessionDisplayName(session: Session): string {
  if (session.user_set_name) {
    return session.name;
  }
  if (session.recipe?.title) {
    return session.recipe.title;
  }
  if (shouldShowNewChatTitle(session)) {
    return DEFAULT_CHAT_TITLE;
  }
  return session.name;
}

export function shouldShowNewChatTitle(session: Session): boolean {
  return !session.user_set_name && session.message_count === 0 && !session.recipe?.title;
}

export function resumeSession(session: Session, setView: setViewType) {
  const eventDetail = {
    sessionId: session.id,
    initialMessage: undefined,
  };

  window.dispatchEvent(
    new CustomEvent(AppEvents.ADD_ACTIVE_SESSION, {
      detail: eventDetail,
    })
  );

  setView('pair', {
    disableAnimation: true,
    resumeSessionId: session.id,
  });
}

interface CreateSessionOptions {
  recipeDeeplink?: string;
  recipeId?: string;
  extensionConfigs?: ExtensionConfig[];
  allExtensions?: FixedExtensionEntry[];
}

function selectedExtensionConfigs(options?: CreateSessionOptions): ExtensionConfig[] {
  if (options?.extensionConfigs && options.extensionConfigs.length > 0) {
    return options.extensionConfigs;
  }
  if (options?.allExtensions) {
    return options.allExtensions
      .filter((extension) => extension.enabled)
      .map((extension) => {
        const { enabled: _enabled, ...config } = extension;
        return config as ExtensionConfig;
      });
  }
  return [];
}

async function createAcpSession(
  workingDir: string,
  options?: CreateSessionOptions
): Promise<Session> {
  const selectedNames = new Set(selectedExtensionConfigs(options).map((config) => config.name));
  const gooseExtensions =
    selectedNames.size > 0
      ? (await getConfiguredGooseExtensions())
          .filter((entry) => selectedNames.has(gooseExtensionName(entry.extension)))
          .map((entry) => entry.extension)
      : [];
  return acpChatSessionController.createSession(workingDir, gooseExtensions, {
    recipeId: options?.recipeId,
    recipeDeeplink: options?.recipeDeeplink,
  });
}

export async function createSession(
  workingDir: string,
  options?: CreateSessionOptions
): Promise<Session> {
  if (USE_ACP_CHAT) {
    return createAcpSession(workingDir, options);
  }

  const body: {
    working_dir: string;
    recipe_deeplink?: string;
    recipe_id?: string;
    extension_overrides?: ExtensionConfig[];
  } = {
    working_dir: workingDir,
  };

  if (options?.recipeId) {
    body.recipe_id = options.recipeId;
  } else if (options?.recipeDeeplink) {
    body.recipe_deeplink = options.recipeDeeplink;
  }

  const extensionConfigs = selectedExtensionConfigs(options);
  if (extensionConfigs.length > 0) {
    body.extension_overrides = extensionConfigs;
  }

  const newAgent = await startAgent({
    body,
    throwOnError: true,
  });
  return newAgent.data;
}

export async function startNewSession(
  initialText: string | undefined,
  setView: setViewType,
  workingDir: string,
  options?: {
    recipeDeeplink?: string;
    recipeId?: string;
    allExtensions?: FixedExtensionEntry[];
  }
): Promise<Session> {
  const session = await createSession(workingDir, options);
  window.dispatchEvent(new CustomEvent(AppEvents.SESSION_CREATED, { detail: { session } }));

  const initialMessage = initialText ? { msg: initialText, images: [] } : undefined;

  const eventDetail = {
    sessionId: session.id,
    initialMessage,
  };

  window.dispatchEvent(
    new CustomEvent(AppEvents.ADD_ACTIVE_SESSION, {
      detail: eventDetail,
    })
  );

  setView('pair', {
    disableAnimation: true,
    initialMessage,
    resumeSessionId: session.id,
  });
  return session;
}