import {
  CUSTOM_WORLD_AGENT_OPERATION_QUERY_KEY,
  CUSTOM_WORLD_AGENT_SESSION_QUERY_KEY,
  CUSTOM_WORLD_GENERATION_SOURCE_QUERY_KEY,
} from './customWorldAgentUiState';

export const CREATION_URL_SESSION_QUERY_KEY = 'sessionId';
export const CREATION_URL_PROFILE_QUERY_KEY = 'profileId';
export const CREATION_URL_DRAFT_QUERY_KEY = 'draftId';
export const CREATION_URL_WORK_QUERY_KEY = 'workId';

export const CREATION_URL_RESTORE_QUERY_KEYS = [
  CUSTOM_WORLD_AGENT_SESSION_QUERY_KEY,
  CUSTOM_WORLD_AGENT_OPERATION_QUERY_KEY,
  CUSTOM_WORLD_GENERATION_SOURCE_QUERY_KEY,
  CREATION_URL_SESSION_QUERY_KEY,
  CREATION_URL_PROFILE_QUERY_KEY,
  CREATION_URL_DRAFT_QUERY_KEY,
  CREATION_URL_WORK_QUERY_KEY,
] as const;

export type CreationUrlState = {
  sessionId?: string | null;
  profileId?: string | null;
  draftId?: string | null;
  workId?: string | null;
};

type CreationUrlEnvironment = {
  location?: {
    pathname: string;
    search: string;
  } | null;
  history?: {
    replaceState: (
      data: unknown,
      unused: string,
      url?: string | URL | null,
    ) => void;
  } | null;
};

const CREATION_PATH_PREFIXES = [
  '/creation/rpg',
  '/creation/big-fish',
  '/creation/match3d',
  '/creation/square-hole',
  '/creation/jump-hop',
  '/creation/wooden-fish',
  '/creation/bark-battle',
  '/creation/visual-novel',
  '/creation/baby-object-match',
  '/creation/puzzle',
] as const;

function resolveEnvironment(
  env?: CreationUrlEnvironment,
): Required<CreationUrlEnvironment> {
  if (env) {
    return {
      location: env.location ?? null,
      history: env.history ?? null,
    };
  }

  if (typeof window === 'undefined') {
    return {
      location: null,
      history: null,
    };
  }

  return {
    location: window.location,
    history: window.history,
  };
}

function normalizeValue(value: unknown) {
  return typeof value === 'string' && value.trim() ? value.trim() : null;
}

function normalizePathname(value: string | undefined) {
  const pathname = value?.trim().toLowerCase() ?? '';
  if (!pathname || pathname === '/') {
    return '/';
  }

  return pathname.replace(/\/+$/u, '');
}

export function isCreationRestorePath(pathname: string | undefined) {
  const normalizedPathname = normalizePathname(pathname);
  return CREATION_PATH_PREFIXES.some(
    (pathPrefix) =>
      normalizedPathname === pathPrefix ||
      normalizedPathname.startsWith(`${pathPrefix}/`),
  );
}

export function isSameCreationFlowPath(
  currentPathname: string | undefined,
  nextPathname: string | undefined,
) {
  const normalizedCurrentPath = normalizePathname(currentPathname);
  const normalizedNextPath = normalizePathname(nextPathname);
  if (
    !normalizedCurrentPath ||
    !normalizedNextPath ||
    normalizedCurrentPath === '/' ||
    normalizedNextPath === '/'
  ) {
    return false;
  }

  const currentCreationPrefix = CREATION_PATH_PREFIXES.find((pathPrefix) =>
    normalizedCurrentPath === pathPrefix ||
    normalizedCurrentPath.startsWith(`${pathPrefix}/`),
  );
  const nextCreationPrefix = CREATION_PATH_PREFIXES.find((pathPrefix) =>
    normalizedNextPath === pathPrefix ||
    normalizedNextPath.startsWith(`${pathPrefix}/`),
  );
  return Boolean(
    currentCreationPrefix &&
      nextCreationPrefix &&
      currentCreationPrefix === nextCreationPrefix,
  );
}

export function buildCreationUrlSearchFromParams(search: string) {
  const params = new URLSearchParams(search);
  const preservedParams = new URLSearchParams();

  CREATION_URL_RESTORE_QUERY_KEYS.forEach((key) => {
    const value = normalizeValue(params.get(key));
    if (value) {
      preservedParams.set(key, value);
    }
  });

  const queryString = preservedParams.toString();
  return queryString ? `?${queryString}` : '';
}

export function readCreationUrlState(
  env?: CreationUrlEnvironment,
): CreationUrlState {
  const resolved = resolveEnvironment(env);
  const params = new URLSearchParams(resolved.location?.search ?? '');

  return {
    sessionId: normalizeValue(params.get(CREATION_URL_SESSION_QUERY_KEY)),
    profileId: normalizeValue(params.get(CREATION_URL_PROFILE_QUERY_KEY)),
    draftId: normalizeValue(params.get(CREATION_URL_DRAFT_QUERY_KEY)),
    workId: normalizeValue(params.get(CREATION_URL_WORK_QUERY_KEY)),
  };
}

export function writeCreationUrlState(
  state: CreationUrlState,
  env?: CreationUrlEnvironment,
) {
  const resolved = resolveEnvironment(env);
  if (
    !resolved.location ||
    !resolved.history?.replaceState ||
    !isCreationRestorePath(resolved.location.pathname)
  ) {
    return;
  }

  const params = new URLSearchParams(resolved.location.search);
  const entries = [
    [CREATION_URL_SESSION_QUERY_KEY, state.sessionId],
    [CREATION_URL_PROFILE_QUERY_KEY, state.profileId],
    [CREATION_URL_DRAFT_QUERY_KEY, state.draftId],
    [CREATION_URL_WORK_QUERY_KEY, state.workId],
  ] as const;

  entries.forEach(([key, rawValue]) => {
    const value = normalizeValue(rawValue);
    if (value) {
      params.set(key, value);
    } else {
      params.delete(key);
    }
  });

  const search = params.toString();
  const nextUrl = search
    ? `${resolved.location.pathname}?${search}`
    : resolved.location.pathname;
  resolved.history.replaceState(null, '', nextUrl);
}

export function clearCreationUrlState(env?: CreationUrlEnvironment) {
  const resolved = resolveEnvironment(env);
  if (
    !resolved.location ||
    !resolved.history?.replaceState ||
    !isCreationRestorePath(resolved.location.pathname)
  ) {
    return;
  }

  const params = new URLSearchParams(resolved.location.search);
  [
    CREATION_URL_SESSION_QUERY_KEY,
    CREATION_URL_PROFILE_QUERY_KEY,
    CREATION_URL_DRAFT_QUERY_KEY,
    CREATION_URL_WORK_QUERY_KEY,
  ].forEach((key) => params.delete(key));

  const search = params.toString();
  const nextUrl = search
    ? `${resolved.location.pathname}?${search}`
    : resolved.location.pathname;
  resolved.history.replaceState(null, '', nextUrl);
}