// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/app_mode/app_mode_utils.h"

#include <stddef.h>

#include <algorithm>
#include <optional>
#include <string>
#include <vector>

#include "base/check.h"
#include "base/command_line.h"
#include "base/strings/string_split.h"
#include "build/buildflag.h"
#include "chrome/app/chrome_command_ids.h"
#include "chrome/browser/policy/policy_util.h"
#include "chrome/common/chrome_switches.h"
#include "components/content_settings/core/common/content_settings_pattern.h"
#include "components/permissions/features.h"
#include "components/prefs/pref_service.h"
#include "url/gurl.h"

#if BUILDFLAG(IS_CHROMEOS)
#include "ash/constants/ash_pref_names.h"
#include "chromeos/components/kiosk/kiosk_utils.h"
#endif

namespace {

// If the device is running in forced app mode, returns the ID of the app for
// which the device is forced in app mode. Otherwise, returns nullopt.
std::optional<std::string> GetForcedAppModeApp() {
  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  if (!command_line->HasSwitch(switches::kForceAppMode) ||
      !command_line->HasSwitch(switches::kAppId)) {
    return std::nullopt;
  }

  return command_line->GetSwitchValueASCII(switches::kAppId);
}

// This method matches the `origin` with the url patterns from
// https://chromeenterprise.google/policies/url-patterns/. Note: just using the
// "*" wildcard is not allowed.
#if BUILDFLAG(IS_CHROMEOS)
bool IsOriginAllowedByPermissionFeatureFlag(
    const std::vector<std::string>& allowlist,
    const GURL& origin) {
  if (allowlist.empty()) {
    return false;
  }

  for (auto const& value : allowlist) {
    ContentSettingsPattern pattern = ContentSettingsPattern::FromString(value);
    if (pattern == ContentSettingsPattern::Wildcard() || !pattern.IsValid()) {
      continue;
    }

    if (pattern.Matches(origin)) {
      return true;
    }
  }

  return false;
}
#endif

}  // namespace

bool IsCommandAllowedInAppMode(int command_id, bool is_popup) {
  DCHECK(IsRunningInForcedAppMode());

  constexpr int kAllowed[] = {
      IDC_BACK,
      IDC_DEV_TOOLS,
      IDC_DEV_TOOLS_CONSOLE,
      IDC_DEV_TOOLS_INSPECT,
      IDC_FORWARD,
      IDC_RELOAD,
      IDC_CLOSE_FIND_OR_STOP,
      IDC_STOP,
      IDC_RELOAD_BYPASSING_CACHE,
      IDC_RELOAD_CLEARING_CACHE,
      IDC_CUT,
      IDC_COPY,
      IDC_PASTE,
      IDC_ZOOM_PLUS,
      IDC_ZOOM_NORMAL,
      IDC_ZOOM_MINUS,
      IDC_CARET_BROWSING_TOGGLE,
  };

  constexpr int kAllowedPopup[] = {IDC_CLOSE_TAB};

  return std::ranges::contains(kAllowed, command_id) ||
         (is_popup && std::ranges::contains(kAllowedPopup, command_id));
}

bool IsRunningInAppMode() {
  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  return command_line->HasSwitch(switches::kKioskMode) ||
         IsRunningInForcedAppMode();
}

bool IsRunningInForcedAppMode() {
  return base::CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kForceAppMode);
}

bool IsRunningInForcedAppModeForApp(const std::string& app_id) {
  DCHECK(!app_id.empty());

  std::optional<std::string> forced_app_mode_app = GetForcedAppModeApp();
  if (!forced_app_mode_app.has_value()) {
    return false;
  }

  return app_id == forced_app_mode_app.value();
}

bool IsWebKioskOriginAllowed(const PrefService* prefs, const GURL& origin) {
#if BUILDFLAG(IS_CHROMEOS)
  if (!chromeos::IsWebKioskSession()) {
    return false;
  }

  if (policy::IsOriginInAllowlist(
          origin, prefs,
          ash::prefs::kKioskBrowserPermissionsAllowedForOrigins)) {
    return true;
  }

  // TODO(b/341057883): Add KioskBrowserPermissionsAllowedForOrigins check.
  std::vector<std::string> allowlist = base::SplitString(
      permissions::feature_params::kWebKioskBrowserPermissionsAllowlist.Get(),
      ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);

  return IsOriginAllowedByPermissionFeatureFlag(allowlist, origin);
#else
  return false;
#endif
}