// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/btm/btm_storage.h"

#include <memory>

#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/strcat.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/threading/thread_restrictions.h"
#include "content/browser/btm/btm_utils.h"
#include "content/public/common/btm_utils.h"
#include "content/public/common/content_features.h"
#include "services/network/public/mojom/clear_data_filter.mojom.h"
#include "url/gurl.h"

namespace content {

BtmStorage::BtmStorage(const std::optional<base::FilePath>& path)
    : db_(std::make_unique<BtmDatabase>(path)) {
  base::AssertLongCPUWorkAllowed();
}

BtmStorage::~BtmStorage() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}

// BtmDatabase interaction functions ------------------------------------------

BtmState BtmStorage::Read(const GURL& url) {
  return ReadSite(GetSiteForBtm(url));
}

BtmState BtmStorage::ReadSite(std::string site) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  std::optional<StateValue> state = db_->Read(site);

  if (state.has_value()) {
    // We should not have entries in the DB without any timestamps.
    DCHECK(state->user_activation_times.has_value() ||
           state->bounce_times.has_value() ||
           state->web_authn_assertion_times.has_value());

    return BtmState(this, std::move(site), state.value());
  }
  return BtmState(this, std::move(site));
}

void BtmStorage::Write(const BtmState& state) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  db_->Write(state.site(), state.user_activation_times(), state.bounce_times(),
             state.web_authn_assertion_times());
}

std::optional<PopupsStateValue> BtmStorage::ReadPopup(
    const std::string& first_party_site,
    const std::string& tracking_site) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  return db_->ReadPopup(first_party_site, tracking_site);
}

std::vector<PopupWithTime> BtmStorage::ReadRecentPopupsWithInteraction(
    const base::TimeDelta& lookback) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  return db_->ReadRecentPopupsWithInteraction(lookback);
}

bool BtmStorage::WritePopup(const std::string& first_party_site,
                            const std::string& tracking_site,
                            const uint64_t access_id,
                            const base::Time& popup_time,
                            bool is_current_interaction,
                            bool is_authentication_interaction) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  return db_->WritePopup(first_party_site, tracking_site, access_id, popup_time,
                         is_current_interaction, is_authentication_interaction);
}

void BtmStorage::RemoveEvents(base::Time delete_begin,
                              base::Time delete_end,
                              network::mojom::ClearDataFilterPtr filter,
                              const BtmEventRemovalType type) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);
  DCHECK(delete_end.is_null() || delete_begin <= delete_end);

  if (delete_end.is_null()) {
    delete_end = base::Time::Max();
  }
  if (delete_begin.is_null()) {
    delete_begin = base::Time::Min();
  }

  if (filter.is_null()) {
    db_->RemoveEventsByTime(delete_begin, delete_end, type);
  } else if (type == BtmEventRemovalType::kStorage && filter->origins.empty()) {
    // Site-filtered deletion is only supported for cookie-related
    // DIPS events, since only cookie deletion allows domains but not hosts.
    //
    // TODO(jdh): Assess the use of cookie deletions with both a time range and
    // a list of domains to determine whether supporting time ranges here is
    // necessary.
    // Time ranges aren't currently supported for site-filtered
    // deletion of DIPS Events.
    if (delete_begin != base::Time::Min() || delete_end != base::Time::Max()) {
      // TODO (kaklilu@): Add a UMA metric to record if this happens.
      return;
    }

    bool preserve =
        (filter->type == network::mojom::ClearDataFilter::Type::KEEP_MATCHES);
    std::vector<std::string> sites = std::move(filter->domains);

    db_->RemoveEventsBySite(preserve, sites, type);
  }
}

void BtmStorage::RemoveRows(const std::vector<std::string>& sites) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  db_->RemoveRows(BtmDatabaseTable::kBounces, sites);
}

void BtmStorage::RemoveRowsWithoutProtectiveEvent(
    const std::set<std::string>& sites) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  std::set<std::string> filtered_sites =
      FilterSitesWithoutProtectiveEvent(sites);

  RemoveRows(
      std::vector<std::string>(filtered_sites.begin(), filtered_sites.end()));
}

// BtmTabHelper Function Impls ------------------------------------------------

void BtmStorage::RecordUserActivation(const GURL& url, base::Time time) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  BtmState state = Read(url);
  state.update_user_activation_time(time);
}

void BtmStorage::RecordWebAuthnAssertion(const GURL& url, base::Time time) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  BtmState state = Read(url);
  state.update_web_authn_assertion_time(time);
}

void BtmStorage::RecordBounce(const GURL& url, base::Time time) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);
  BtmState state = Read(url);
  state.update_bounce_time(time);
}

std::pair<std::set<std::string>, std::set<std::string>>
BtmStorage::FilterSitesWithProtectiveEvent(
    const std::set<std::string>& sites) const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  return {
      db_->FilterSites(sites, BtmDatabase::BounceFilterType::kUserActivation),
      db_->FilterSites(sites,
                       BtmDatabase::BounceFilterType::kWebAuthnAssertion)};
}

std::set<std::string> BtmStorage::FilterSitesWithoutProtectiveEvent(
    std::set<std::string> sites) const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);

  std::set<std::string> interacted_sites =
      db_->FilterSites(sites, BtmDatabase::BounceFilterType::kProtectiveEvent);

  for (const auto& site : interacted_sites) {
    if (sites.count(site)) {
      sites.erase(site);
    }
  }

  return sites;
}

std::vector<std::string> BtmStorage::GetSitesThatBounced(
    base::TimeDelta grace_period) const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(db_);
  return db_->GetSitesThatBounced(grace_period);
}

std::vector<std::string> BtmStorage::GetSitesToClear(
    std::optional<base::TimeDelta> custom_period) const {
  std::vector<std::string> sites_to_clear;
  base::TimeDelta grace_period =
      custom_period.value_or(features::kBtmGracePeriod.Get());

  switch (features::kBtmTriggeringAction.Get()) {
    case BtmTriggeringAction::kNone: {
      return {};
    }
    case BtmTriggeringAction::kBounce: {
      sites_to_clear = GetSitesThatBounced(grace_period);
      break;
    }
  }

  return sites_to_clear;
}

bool BtmStorage::DidSiteHaveUserActivationSince(const GURL& url,
                                                base::Time bound) {
  auto last_user_activation_time = LastUserActivationTime(url);
  return last_user_activation_time.has_value() &&
         last_user_activation_time >= bound;
}

std::optional<base::Time> BtmStorage::LastUserActivationTime(const GURL& url) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  const BtmState state = Read(url);
  if (!state.user_activation_times().has_value()) {
    return std::nullopt;
  }
  return state.user_activation_times()->second;
}

std::optional<base::Time> BtmStorage::LastWebAuthnAssertionTime(
    const GURL& url) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  const BtmState state = Read(url);
  if (!state.web_authn_assertion_times().has_value()) {
    return std::nullopt;
  }
  return state.web_authn_assertion_times()->second;
}

std::optional<base::Time> BtmStorage::LastUserActivationOrAuthnAssertionTime(
    const GURL& url) {
  return LastInteractionTimeAndType(url).first;
}

std::pair<std::optional<base::Time>, BtmInteractionType>
BtmStorage::LastInteractionTimeAndType(const GURL& url) {
  base::Time last_user_activation_time =
      LastUserActivationTime(url).value_or(base::Time::Min());
  base::Time last_web_authn_assertion_time =
      LastWebAuthnAssertionTime(url).value_or(base::Time::Min());

  if ((last_user_activation_time == last_web_authn_assertion_time) &&
      (last_user_activation_time == base::Time::Min())) {
    return std::make_pair(std::nullopt, BtmInteractionType::NoInteraction);
  }
  if (last_user_activation_time >= last_web_authn_assertion_time) {
    return std::make_pair(last_user_activation_time,
                          BtmInteractionType::UserActivation);
  }
  return std::make_pair(last_web_authn_assertion_time,
                        BtmInteractionType::Authentication);
}

/* static */
void BtmStorage::DeleteDatabaseFiles(base::FilePath path,
                                     base::OnceClosure on_complete) {
  // TODO (jdh): Decide how to handle the case of failing to delete db files.
  base::ThreadPool::PostTaskAndReply(
      FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
      base::BindOnce(IgnoreResult(&sql::Database::Delete), std::move(path)),
      std::move(on_complete));
}

std::optional<base::Time> BtmStorage::GetTimerLastFired() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return db_->GetTimerLastFired();
}

bool BtmStorage::SetTimerLastFired(base::Time time) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return db_->SetTimerLastFired(time);
}

}  // namespace content