// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

mod client;
mod consumer;
mod identifier;
mod messages;
mod producer;
mod type_conversion;

use client::{Client, delete_connection as delete_client, from_connection_string, new_connection};
use consumer::Consumer;
use messages::make_message;
use producer::Producer;
use std::sync::LazyLock;

static RUNTIME: LazyLock<tokio::runtime::Runtime> = LazyLock::new(|| {
    tokio::runtime::Builder::new_multi_thread()
        .enable_all()
        .build()
        .unwrap()
});

#[cxx::bridge(namespace = "iggy::ffi")]
mod ffi {
    struct Identifier {
        kind: String,
        length: u8,
        value: Vec<u8>,
    }

    struct Topic {
        id: u32,
        created_at: u64,
        name: String,
        size_bytes: u64,
        message_expiry: u64,
        compression_algorithm: String,
        max_topic_size: u64,
        messages_count: u64,
        partitions_count: u32,
        /// Options the creating client set explicitly. Carried as
        /// `HeaderEntry` because options ride the user-headers codec: the same
        /// TLV a message's `user_headers` uses, with string keys.
        options: Vec<HeaderEntry>,
        /// Options admission resolved for the keys the client left unset. These
        /// would have resolved differently under another server config.
        derived_options: Vec<HeaderEntry>,
    }

    struct Partition {
        id: u32,
        created_at: u64,
        segments_count: u32,
        current_offset: u64,
        size_bytes: u64,
        messages_count: u64,
    }

    struct TopicDetails {
        id: u32,
        created_at: u64,
        name: String,
        size_bytes: u64,
        message_expiry: u64,
        compression_algorithm: String,
        max_topic_size: u64,
        messages_count: u64,
        partitions_count: u32,
        partitions: Vec<Partition>,
        /// See [`Topic::options`].
        options: Vec<HeaderEntry>,
        /// See [`Topic::derived_options`].
        derived_options: Vec<HeaderEntry>,
    }

    struct Stream {
        id: u32,
        created_at: u64,
        name: String,
        size_bytes: u64,
        messages_count: u64,
        topics_count: u32,
        /// Creation options. Streams have no catalog keys yet, so this is
        /// empty until one lands.
        options: Vec<HeaderEntry>,
    }

    #[repr(u8)]
    enum HeaderKind {
        Raw = 1,
        String = 2,
        Bool = 3,
        Int8 = 4,
        Int16 = 5,
        Int32 = 6,
        Int64 = 7,
        Int128 = 8,
        Uint8 = 9,
        Uint16 = 10,
        Uint32 = 11,
        Uint64 = 12,
        Uint128 = 13,
        Float32 = 14,
        Float64 = 15,
    }

    struct HeaderField {
        kind: u8,
        value: Vec<u8>,
    }

    struct HeaderEntry {
        key: HeaderField,
        value: HeaderField,
    }

    /// One key a resource's create command accepts, as served by
    /// `describe_options`.
    ///
    /// This is the discovery surface for the keys `create_topic` takes. A key
    /// outside the server catalog is refused at create, and the binary
    /// transports carry back only an error code, so nothing in the rejection
    /// names the keys that would have worked.
    struct OptionSpec {
        key: String,
        /// Wire kind code the value is encoded under, the same encoding
        /// [`HeaderField::kind`] carries.
        kind: u8,
        /// The default in `kind`'s encoding. Empty when the key has no default.
        default_value: Vec<u8>,
        description: String,
    }

    struct IggyMessageToSend {
        id_lo: u64,
        id_hi: u64,
        payload: Vec<u8>,
        user_headers: Vec<HeaderEntry>,
    }

    struct IggyMessagePolled {
        checksum: u64,
        id_lo: u64,
        id_hi: u64,
        offset: u64,
        timestamp: u64,
        origin_timestamp: u64,
        user_headers_length: u32,
        payload_length: u32,
        reserved: u64,
        payload: Vec<u8>,
        user_headers: Vec<HeaderEntry>,
    }

    struct PolledMessages {
        partition_id: u32,
        current_offset: u64,
        count: u32,
        messages: Vec<IggyMessagePolled>,
    }

    /// Commit confirmation for one partition written by `send_messages`.
    struct SendMessagesConfirmation {
        stream_id: u32,
        topic_id: u32,
        partition_id: u32,
        /// Offset assigned to the first message of the batch in this partition.
        ///
        /// Sends are at-least-once: an earlier retry may already have committed
        /// the same batch at a lower offset, so this never identifies a batch
        /// uniquely.
        ///
        /// A batch is confirmed once it is committed in memory, not once it is
        /// fsynced. A crash-restart can stamp a later batch with an offset a
        /// client has already recorded.
        base_offset: u64,
    }

    /// Reply to `send_messages`.
    struct SendMessagesResponse {
        /// One entry per partition the batch was written to. Empty whenever the
        /// server reports no offsets, which is every send against the legacy
        /// server, so call `empty()` before indexing.
        confirmations: Vec<SendMessagesConfirmation>,
    }

    struct StreamDetails {
        id: u32,
        created_at: u64,
        name: String,
        size_bytes: u64,
        messages_count: u64,
        topics_count: u32,
        topics: Vec<Topic>,
        /// See [`Stream::options`].
        options: Vec<HeaderEntry>,
    }

    struct ConsumerGroupMember {
        id: u32,
        partitions_count: u32,
        partitions: Vec<u32>,
    }

    struct ConsumerGroupDetails {
        id: u32,
        name: String,
        partitions_count: u32,
        members_count: u32,
        members: Vec<ConsumerGroupMember>,
    }

    struct ConsumerGroup {
        id: u32,
        name: String,
        partitions_count: u32,
        members_count: u32,
    }

    struct ConsumerGroupInfo {
        stream_id: u32,
        topic_id: u32,
        group_id: u32,
    }

    struct ConsumerOffsetInfo {
        partition_id: u32,
        current_offset: u64,
        stored_offset: u64,
    }

    struct ClientInfo {
        client_id: u32,
        has_user_id: bool,
        user_id: u32,
        address: String,
        transport: String,
        consumer_groups_count: u32,
    }

    struct ClientInfoDetails {
        client_id: u32,
        has_user_id: bool,
        user_id: u32,
        address: String,
        transport: String,
        consumer_groups_count: u32,
        consumer_groups: Vec<ConsumerGroupInfo>,
    }

    struct CacheMetricEntry {
        stream_id: u32,
        topic_id: u32,
        partition_id: u32,
        hits: u64,
        misses: u64,
        hit_ratio: f32,
    }

    struct Stats {
        process_id: u32,
        cpu_usage: f32,
        total_cpu_usage: f32,
        memory_usage: u64,
        total_memory: u64,
        available_memory: u64,
        run_time_micros: u64,
        start_time_epoch_micros: u64,
        read_bytes: u64,
        written_bytes: u64,
        messages_size_bytes: u64,
        streams_count: u32,
        topics_count: u32,
        partitions_count: u32,
        segments_count: u32,
        messages_count: u64,
        clients_count: u32,
        consumer_groups_count: u32,
        hostname: String,
        os_name: String,
        os_version: String,
        kernel_version: String,
        iggy_server_version: String,
        // `iggy_server_semver` is only meaningful when this flag is true.
        has_server_semver: bool,
        // Uses `0` when the Rust `Option<u32>` is absent; check `has_server_semver`
        // before reading this field.
        iggy_server_semver: u32,
        cache_metrics: Vec<CacheMetricEntry>,
        threads_count: u32,
        free_disk_space: u64,
        total_disk_space: u64,
    }

    struct TransportEndpoints {
        tcp: u16,
        quic: u16,
        http: u16,
        websocket: u16,
    }

    struct ClusterNode {
        name: String,
        ip: String,
        endpoints: TransportEndpoints,
        role: String,
        status: String,
    }

    struct ClusterMetadata {
        name: String,
        nodes: Vec<ClusterNode>,
    }

    struct GlobalPermissions {
        manage_servers: bool,
        read_servers: bool,
        manage_users: bool,
        read_users: bool,
        manage_streams: bool,
        read_streams: bool,
        manage_topics: bool,
        read_topics: bool,
        poll_messages: bool,
        send_messages: bool,
    }

    struct TopicPermissions {
        manage_topic: bool,
        read_topic: bool,
        poll_messages: bool,
        send_messages: bool,
    }

    struct TopicPermissionEntry {
        topic_id: u32,
        permissions: TopicPermissions,
    }

    struct StreamPermissions {
        manage_stream: bool,
        read_stream: bool,
        manage_topics: bool,
        read_topics: bool,
        poll_messages: bool,
        send_messages: bool,
        topics: Vec<TopicPermissionEntry>,
    }

    struct StreamPermissionEntry {
        stream_id: u32,
        permissions: StreamPermissions,
    }

    struct Permissions {
        global: GlobalPermissions,
        streams: Vec<StreamPermissionEntry>,
    }

    #[repr(u8)]
    enum UserStatus {
        Active = 1,
        Inactive = 2,
    }

    struct UserInfo {
        id: u32,
        created_at: u64,
        status: UserStatus,
        username: String,
    }

    struct UserInfoDetails {
        id: u32,
        created_at: u64,
        status: UserStatus,
        username: String,
        has_permissions: bool,
        permissions: Permissions,
    }

    struct LoginInfo {
        user_id: u32,
        has_access_token: bool,
        access_token: String,
        access_token_expiry: u64,
    }

    #[repr(u8)]
    enum AutoLoginKind {
        Disabled = 0,
        UsernamePassword,
        PersonalAccessToken,
    }

    struct IggyClientConfig {
        server_address: String,
        auto_login_kind: AutoLoginKind,
        username: String,
        password: String,
        personal_access_token: String,
        has_reconnection_max_retries: bool,
        reconnection_max_retries: u32,
        has_reconnection_interval: bool,
        reconnection_interval_micros: u64,
        has_reestablish_after: bool,
        reestablish_after_micros: u64,
        tls_enabled: bool,
        tls_domain: String,
        tls_ca_file: String,
        has_tls_validate_certificate: bool,
        tls_validate_certificate: bool,
        no_delay: bool,
    }

    struct TopicCreateOptions {
        has_partitions_count: bool,
        partitions_count: u32,
        has_compression_algorithm: bool,
        compression_algorithm: String,
        has_message_expiry: bool,
        message_expiry_kind: String,
        message_expiry_value: u64,
        has_max_topic_size: bool,
        max_topic_size: String,
        has_segment_size: bool,
        segment_size: u64,
        has_enforce_fsync: bool,
        enforce_fsync: bool,
        has_messages_required_to_save: bool,
        messages_required_to_save: u32,
        has_size_of_messages_required_to_save: bool,
        size_of_messages_required_to_save: u64,
        has_preallocate_segments: bool,
        preallocate_segments: bool,
        raw_options: Vec<HeaderEntry>,
    }

    struct TopicUpdateOptions {
        has_compression_algorithm: bool,
        compression_algorithm: String,
        has_message_expiry: bool,
        message_expiry_kind: String,
        message_expiry_value: u64,
        has_max_topic_size: bool,
        max_topic_size: String,
        raw_options: Vec<HeaderEntry>,
    }

    extern "Rust" {
        type Client;
        type Consumer;
        type Producer;

        // Client functions
        fn new_connection(config: IggyClientConfig) -> Result<*mut Client>;
        fn from_connection_string(connection_string: String) -> Result<*mut Client>;
        fn login_user(self: &Client, username: String, password: String) -> Result<LoginInfo>;
        fn logout_user(self: &Client) -> Result<()>;
        fn connect(self: &Client) -> Result<()>;
        fn create_stream(self: &Client, stream_name: String) -> Result<StreamDetails>;
        fn update_stream(
            self: &Client,
            stream_id: Identifier,
            stream_name: String,
            options: Vec<HeaderEntry>,
        ) -> Result<()>;
        fn get_streams(self: &Client) -> Result<Vec<Stream>>;
        fn get_stream(self: &Client, stream_id: Identifier) -> Result<StreamDetails>;
        fn delete_stream(self: &Client, stream_id: Identifier) -> Result<()>;
        fn purge_stream(self: &Client, stream_id: Identifier) -> Result<()>;
        fn create_topic(
            self: &Client,
            stream_id: Identifier,
            topic_name: String,
            options: TopicCreateOptions,
        ) -> Result<TopicDetails>;
        fn get_topic(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
        ) -> Result<TopicDetails>;
        fn get_topics(self: &Client, stream_id: Identifier) -> Result<Vec<Topic>>;
        fn update_topic(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            topic_name: String,
            options: TopicUpdateOptions,
        ) -> Result<()>;
        fn delete_topic(self: &Client, stream_id: Identifier, topic_id: Identifier) -> Result<()>;
        fn purge_topic(self: &Client, stream_id: Identifier, topic_id: Identifier) -> Result<()>;
        fn create_partitions(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partitions_count: u32,
        ) -> Result<()>;
        fn delete_partitions(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partitions_count: u32,
        ) -> Result<()>;
        fn create_consumer_group(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            name: String,
        ) -> Result<ConsumerGroupDetails>;
        fn get_consumer_group(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            group_id: Identifier,
        ) -> Result<ConsumerGroupDetails>;
        fn get_consumer_groups(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
        ) -> Result<Vec<ConsumerGroup>>;
        fn delete_consumer_group(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            group_id: Identifier,
        ) -> Result<()>;
        fn join_consumer_group(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            group_id: Identifier,
        ) -> Result<()>;
        fn leave_consumer_group(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            group_id: Identifier,
        ) -> Result<()>;
        fn store_consumer_offset(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partition_id: u32,
            consumer_kind: String,
            consumer_id: Identifier,
            offset: u64,
        ) -> Result<()>;
        fn get_consumer_offset(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partition_id: u32,
            consumer_kind: String,
            consumer_id: Identifier,
        ) -> Result<ConsumerOffsetInfo>;
        fn delete_consumer_offset(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partition_id: u32,
            consumer_kind: String,
            consumer_id: Identifier,
        ) -> Result<()>;

        #[allow(clippy::too_many_arguments)]
        fn poll_messages(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partition_id: u32,
            consumer_kind: String,
            consumer_id: Identifier,
            polling_strategy_kind: String,
            polling_strategy_value: u64,
            count: u32,
            auto_commit: bool,
        ) -> Result<PolledMessages>;

        fn make_message(payload: Vec<u8>, user_headers: Vec<HeaderEntry>) -> IggyMessageToSend;

        #[allow(clippy::too_many_arguments)]
        fn send_messages(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partitioning_kind: String,
            partitioning_value: Vec<u8>,
            messages: Vec<IggyMessageToSend>,
        ) -> Result<SendMessagesResponse>;
        fn flush_unsaved_buffer(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partition_id: u32,
            fsync: bool,
        ) -> Result<()>;
        fn get_stats(self: &Client) -> Result<Stats>;
        fn get_me(self: &Client) -> Result<ClientInfoDetails>;
        fn get_client(self: &Client, client_id: u32) -> Result<ClientInfoDetails>;
        fn get_clients(self: &Client) -> Result<Vec<ClientInfo>>;
        /// Serves the option catalog of one scope, named "topic", "stream" or
        /// "user". A scope with no keys yet answers with an empty vector, which
        /// is an empty catalog rather than a failure.
        fn describe_options(self: &Client, scope: String) -> Result<Vec<OptionSpec>>;
        fn ping(self: &Client) -> Result<()>;
        fn heartbeat_interval(self: &Client) -> u64;
        fn snapshot(
            self: &Client,
            snapshot_compression: String,
            snapshot_types: Vec<String>,
        ) -> Result<Vec<u8>>;
        fn send_binary_request(self: &Client, code: u32, payload: Vec<u8>) -> Result<Vec<u8>>;

        // Future functions
        fn disconnect(self: &Client) -> Result<()>;
        fn shutdown(self: &Client) -> Result<()>;
        // fn subscribe_events(self: &Client) -> Result<()>;
        fn delete_segments(
            self: &Client,
            stream_id: Identifier,
            topic_id: Identifier,
            partition_id: u32,
            segments_count: u32,
        ) -> Result<()>;
        fn get_user(self: &Client, user_id: Identifier) -> Result<UserInfoDetails>;
        fn get_users(self: &Client) -> Result<Vec<UserInfo>>;
        fn create_user(
            self: &Client,
            username: String,
            password: String,
            status: UserStatus,
            has_permissions: bool,
            permissions: Permissions,
        ) -> Result<UserInfoDetails>;
        fn delete_user(self: &Client, user_id: Identifier) -> Result<()>;
        fn update_user(
            self: &Client,
            user_id: Identifier,
            has_username: bool,
            username: String,
            has_status: bool,
            status: UserStatus,
        ) -> Result<()>;
        fn update_permissions(
            self: &Client,
            user_id: Identifier,
            has_permissions: bool,
            permissions: Permissions,
        ) -> Result<()>;
        fn change_password(
            self: &Client,
            user_id: Identifier,
            current_password: String,
            new_password: String,
        ) -> Result<()>;
        fn get_cluster_metadata(self: &Client) -> Result<ClusterMetadata>;
        // fn get_personal_access_tokens(self: &Client) -> Result<Vec<PersonalAccessTokenInfo>>;
        // fn create_personal_access_token(
        //     self: &Client,
        //     name: String,
        //     expiry: u64,
        // ) -> Result<RawPersonalAccessToken>;
        // fn delete_personal_access_token(self: &Client, name: String) -> Result<()>;
        // fn login_with_personal_access_token(self: &Client, token: String) -> Result<IdentityInfo>;

        unsafe fn delete_client(client: *mut Client);

        // Identifier functions
        fn set_string(self: &mut Identifier, id: String) -> Result<()>;
        fn set_numeric(self: &mut Identifier, id: u32) -> Result<()>;

        // Consumer methods
        // fn name(self: &Consumer) -> Result<String>;
        // fn topic(self: &Consumer) -> Result<Identifier>;
        // fn stream(self: &Consumer) -> Result<Identifier>;
        // fn partition_id(self: &Consumer) -> u32;
        // fn store_offset(self: &Consumer, offset: u64, partition_id: u32) -> Result<()>;
        // fn delete_offset(self: &Consumer, partition_id: u32) -> Result<()>;
        // fn get_last_consumed_offset(self: &Consumer, partition_id: u32) -> Result<u64>;
        // fn get_last_stored_offset(self: &Consumer, partition_id: u32) -> Result<u64>;
        // fn init(self: &mut Consumer) -> Result<()>;
        // fn shutdown(self: &mut Consumer) -> Result<()>;
        // unsafe fn delete_consumer(consumer: *mut Consumer) -> Result<()>;

        // Producer methods
        // fn stream(self: &Producer) -> Result<Identifier>;
        // fn topic(self: &Producer) -> Result<Identifier>;
        // fn init(self: &Producer) -> Result<()>;
        // fn send(self: &Producer, messages: Vec<IggyMessageToSend>) -> Result<()>;
        // fn send_one(self: &Producer, message: IggyMessageToSend) -> Result<()>;
        // fn send_with_partitioning(self: &Producer, partitioning_kind: String, partitioning_value: Vec<u8>, messages: Vec<IggyMessageToSend>) -> Result<()>;
        // fn send_to(self: &Producer, stream_id: Identifier, topic_id: Identifier, partitioning_kind: String, partitioning_value: Vec<u8>, messages: Vec<IggyMessageToSend>) -> Result<()>;
        // fn shutdown(self: &mut Producer) -> Result<()>;
        // unsafe fn delete_producer(producer: *mut Producer) -> Result<()>;
    }
}