/*
 * Copyright (c) 2024-2025, stelar7 <dudedbz@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/String.h>
#include <LibJS/Runtime/Array.h>
#include <LibWeb/Bindings/IDBObjectStorePrototype.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/HTML/EventNames.h>
#include <LibWeb/IndexedDB/IDBIndex.h>
#include <LibWeb/IndexedDB/IDBObjectStore.h>

namespace Web::IndexedDB {

GC_DEFINE_ALLOCATOR(IDBObjectStore);

IDBObjectStore::~IDBObjectStore() = default;

IDBObjectStore::IDBObjectStore(JS::Realm& realm, GC::Ref<ObjectStore> store, GC::Ref<IDBTransaction> transaction)
    : PlatformObject(realm)
    , m_store(store)
    , m_transaction(transaction)
    , m_name(store->name())
{
}

GC::Ref<IDBObjectStore> IDBObjectStore::create(JS::Realm& realm, GC::Ref<ObjectStore> store, GC::Ref<IDBTransaction> transaction)
{
    return realm.create<IDBObjectStore>(realm, store, transaction);
}

void IDBObjectStore::initialize(JS::Realm& realm)
{
    Base::initialize(realm);
    WEB_SET_PROTOTYPE_FOR_INTERFACE(IDBObjectStore);
}

void IDBObjectStore::visit_edges(Visitor& visitor)
{
    Base::visit_edges(visitor);
    visitor.visit(m_store);
    visitor.visit(m_transaction);
    visitor.visit(m_indexes);
}

// https://w3c.github.io/IndexedDB/#dom-idbobjectstore-keypath
JS::Value IDBObjectStore::key_path() const
{
    if (!m_store->key_path().has_value())
        return JS::js_null();

    return m_store->key_path().value().visit(
        [&](String const& value) -> JS::Value {
            return JS::PrimitiveString::create(realm().vm(), value);
        },
        [&](Vector<String> const& value) -> JS::Value {
            return JS::Array::create_from<String>(realm(), value.span(), [&](auto const& entry) -> JS::Value {
                return JS::PrimitiveString::create(realm().vm(), entry);
            });
        });
}

// https://w3c.github.io/IndexedDB/#dom-idbobjectstore-name
WebIDL::ExceptionOr<void> IDBObjectStore::set_name(String const& value)
{
    auto& realm = this->realm();

    // 1. Let name be the given value.
    auto const& name = value;

    // 2. Let transaction be this’s transaction.
    auto& transaction = m_transaction;

    // 3. Let store be this’s object store.
    auto& store = m_store;

    // FIXME: 4. If store has been deleted, throw an "InvalidStateError" DOMException.

    // 5. If transaction is not an upgrade transaction, throw an "InvalidStateError" DOMException.
    if (transaction->mode() != Bindings::IDBTransactionMode::Versionchange)
        return WebIDL::InvalidStateError::create(realm, "Attempted to set name outside of version change"_string);

    // 6. If transaction’s state is not active, throw a "TransactionInactiveError" DOMException.
    if (transaction->state() != IDBTransaction::TransactionState::Active)
        return WebIDL::TransactionInactiveError::create(realm, "Transaction is not active"_string);

    // 7. If store’s name is equal to name, terminate these steps.
    if (store->name() == name)
        return {};

    // 8. If an object store named name already exists in store’s database, throw a "ConstraintError" DOMException.
    if (store->database()->object_store_with_name(name))
        return WebIDL::ConstraintError::create(realm, "Object store with the given name already exists"_string);

    // 9. Set store’s name to name.
    store->set_name(name);

    // 10. Set this’s name to name.
    m_name = name;

    return {};
}

// https://w3c.github.io/IndexedDB/#dom-idbobjectstore-createindex
WebIDL::ExceptionOr<GC::Ref<IDBIndex>> IDBObjectStore::create_index(String const& name, KeyPath key_path, IDBIndexParameters options)
{
    auto& realm = this->realm();

    // 1. Let transaction be this's transaction.
    auto transaction = this->transaction();

    // 2. Let store be this's object store.
    auto store = this->store();

    // 3. If transaction is not an upgrade transaction, throw an "InvalidStateError" DOMException.
    if (transaction->mode() != Bindings::IDBTransactionMode::Versionchange)
        return WebIDL::InvalidStateError::create(realm, "Transaction is not an upgrade transaction"_string);

    // FIXME: 4. If store has been deleted, throw an "InvalidStateError" DOMException.

    // 5. If transaction’s state is not active, then throw a "TransactionInactiveError" DOMException.
    if (transaction->state() != IDBTransaction::TransactionState::Active)
        return WebIDL::TransactionInactiveError::create(realm, "Transaction is not active while creating index"_string);

    // 6. If an index named name already exists in store, throw a "ConstraintError" DOMException.
    if (store->index_set().contains(name))
        return WebIDL::ConstraintError::create(realm, "An index with the given name already exists"_string);

    // 7. If keyPath is not a valid key path, throw a "SyntaxError" DOMException.
    if (!is_valid_key_path(key_path))
        return WebIDL::SyntaxError::create(realm, "Key path is not valid"_string);

    // 8. Let unique be options’s unique member.
    auto unique = options.unique;

    // 9. Let multiEntry be options’s multiEntry member.
    auto multi_entry = options.multi_entry;

    // 10. If keyPath is a sequence and multiEntry is true, throw an "InvalidAccessError" DOMException.
    if (key_path.has<Vector<String>>() && multi_entry)
        return WebIDL::InvalidAccessError::create(realm, "Key path is a sequence and multiEntry is true"_string);

    // 11. Let index be a new index in store.
    //     Set index’s name to name, key path to keyPath, unique flag to unique, and multiEntry flag to multiEntry.
    auto index = Index::create(realm, store, name, key_path, unique, multi_entry);

    // 12. Add index to this's index set.
    this->index_set().set(name, index);

    // 13. Return a new index handle associated with index and this.
    return IDBIndex::create(realm, index, *this);
}

// https://w3c.github.io/IndexedDB/#dom-idbobjectstore-indexnames
GC::Ref<HTML::DOMStringList> IDBObjectStore::index_names()
{
    // 1. Let names be a list of the names of the indexes in this's index set.
    Vector<String> names;
    for (auto const& [name, index] : m_indexes)
        names.append(name);

    // 2. Return the result (a DOMStringList) of creating a sorted name list with names.
    return create_a_sorted_name_list(realm(), names);
}

}