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/*
 * 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.
 */
use std::{
    collections::{hash_map::DefaultHasher, HashSet},
    hash::{Hash, Hasher},
    net::SocketAddr,
};

use bytes::BufMut;

use crate::{
    common::message::{message_single::MessageExt, MessageConst},
    MessageDecoder::PROPERTY_SEPARATOR,
    UtilAll::bytes_to_string,
};

pub fn get_sharding_key_index(sharding_key: &str, index_size: usize) -> usize {
    let mut hasher = DefaultHasher::new();
    sharding_key.hash(&mut hasher);
    let hash = hasher.finish() as usize;
    hash % index_size
}

pub fn get_sharding_key_index_by_msg(msg: &MessageExt, index_size: usize) -> usize {
    let sharding_key = msg
        .message
        .properties
        .get(MessageConst::PROPERTY_SHARDING_KEY)
        .cloned()
        .unwrap_or_default();

    get_sharding_key_index(sharding_key.as_str(), index_size)
}

pub fn get_sharding_key_indexes(msgs: &[MessageExt], index_size: usize) -> HashSet<usize> {
    let mut index_set = HashSet::with_capacity(index_size);
    for msg in msgs {
        let idx = get_sharding_key_index_by_msg(msg, index_size);
        index_set.insert(idx);
    }
    index_set
}

//need refactor
pub fn delete_property(properties_string: &str, name: &str) -> String {
    if properties_string.is_empty() {
        return properties_string.to_owned();
    }
    let index1 = properties_string.find(name);
    if index1.is_none() {
        return properties_string.to_owned();
    }
    properties_string
        .split(PROPERTY_SEPARATOR)
        .map(|s| s.to_owned())
        .filter(|s| s.starts_with(name))
        .collect::<Vec<String>>()
        .join(PROPERTY_SEPARATOR.to_string().as_str())
}

pub fn build_message_id(socket_addr: SocketAddr, wrote_offset: i64) -> String {
    let mut msg_id_vec = match socket_addr {
        SocketAddr::V4(addr) => {
            let mut msg_id_vec = Vec::<u8>::with_capacity(16);
            msg_id_vec.extend_from_slice(&addr.ip().octets());
            msg_id_vec.put_i32(addr.port() as i32);
            msg_id_vec
        }
        SocketAddr::V6(addr) => {
            let mut msg_id_vec = Vec::<u8>::with_capacity(28);
            msg_id_vec.extend_from_slice(&addr.ip().octets());
            msg_id_vec.put_i32(addr.port() as i32);
            msg_id_vec
        }
    };
    msg_id_vec.put_i64(wrote_offset);
    bytes_to_string(msg_id_vec.as_slice())
}

pub fn parse_message_id(_msg_id: impl Into<String>) -> (SocketAddr, i64) {
    unimplemented!()
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::common::message::message_single::MessageExt;

    #[test]
    fn test_get_sharding_key_index() {
        let sharding_key = "example_key";
        let index_size = 10;
        let result = get_sharding_key_index(sharding_key, index_size);
        assert!(result < index_size);
    }

    #[test]
    fn test_get_sharding_key_index_by_msg() {
        let mut message = MessageExt::default();
        message.message.properties.insert(
            MessageConst::PROPERTY_SHARDING_KEY.to_owned(),
            "example_key".to_owned(),
        );
        let index_size = 10;
        let result = get_sharding_key_index_by_msg(&message, index_size);
        assert!(result < index_size);
    }

    #[test]
    fn test_get_sharding_key_indexes() {
        let mut messages = Vec::new();
        let mut message1 = MessageExt::default();
        message1.message.properties.insert(
            MessageConst::PROPERTY_SHARDING_KEY.to_owned(),
            "key1".to_owned(),
        );
        messages.push(message1);
        let mut message2 = MessageExt::default();
        message2.message.properties.insert(
            MessageConst::PROPERTY_SHARDING_KEY.to_owned(),
            "key2".to_owned(),
        );
        messages.push(message2);
        let index_size = 10;
        let result = get_sharding_key_indexes(&messages, index_size);
        assert_eq!(result.len(), 2);
    }

    #[test]
    fn test_delete_property() {
        let properties_string = "aa\u{0001}bb\u{0002}cc\u{0001}bb\u{0002}";
        let name = "a";
        let result = delete_property(properties_string, name);
        assert_eq!(result, "aa\u{0001}bb");
    }

    #[test]
    fn test_build_message_id() {
        let socket_addr = "127.0.0.1:12".parse().unwrap();
        let wrote_offset = 1;
        let result = build_message_id(socket_addr, wrote_offset);
        assert_eq!(result, "7F0000010000000C0000000000000001");
    }
}