// Copyright (C) 2024 Huawei Device Co., Ltd.
// Licensed 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::sync::Arc;
use std::time::Duration;

use ylong_http_client::Headers;
use ylong_runtime::net::UnixDatagram;
use ylong_runtime::sync::oneshot;

use crate::service::client::manager::ClientManager;
use crate::service::client::{Client, ClientEvent, ClientManagerEntry};
use crate::task::notify::{NotifyData, SubscribeType, WaitingCause};
use crate::task::reason::Reason;
use crate::config::Version;

#[cfg(test)]
mod tests {
    use super::*;

    // @tc.name: ut_client_manager_entry_new
    // @tc.desc: Test creating a new ClientManagerEntry instance
    // @tc.precon: NA
    // @tc.step: 1. Create an unbounded channel
    //           2. Create ClientManagerEntry with the sender
    // @tc.expect: ClientManagerEntry is created successfully with correct sender
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 0
    #[test]
    fn ut_client_manager_entry_new_001() {
        let (tx, _rx) = ylong_runtime::sync::mpsc::unbounded_channel();
        let entry = ClientManagerEntry::new(tx.clone());
        assert!(entry.send_event(ClientEvent::TaskFinished(1)));
    }

    // @tc.name: ut_client_manager_entry_send_event_success
    // @tc.desc: Test successful event sending through ClientManagerEntry
    // @tc.precon: Valid unbounded channel exists
    // @tc.step: 1. Create ClientManagerEntry
    //           2. Send a valid ClientEvent
    // @tc.expect: send_event returns true
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 1
    #[test]
    fn ut_client_manager_entry_send_event_success_001() {
        let (tx, rx) = ylong_runtime::sync::mpsc::unbounded_channel();
        let entry = ClientManagerEntry::new(tx);

        let result = entry.send_event(ClientEvent::TaskFinished(42));
        assert_eq!(result, true);

        // Verify event was received
        let received = rx.try_recv();
        assert!(received.is_ok());
        match received.unwrap() {
            ClientEvent::TaskFinished(tid) => assert_eq!(tid, 42),
            _ => panic!("Unexpected event type"),
        }
    }

    // @tc.name: ut_client_manager_entry_send_event_failure
    // @tc.desc: Test event sending failure when channel is closed
    // @tc.precon: Channel receiver is dropped
    // @tc.step: 1. Create ClientManagerEntry
    //           2. Drop the receiver
    //           3. Attempt to send an event
    // @tc.expect: send_event returns false
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 2
    #[test]
    fn ut_client_manager_entry_send_event_failure_001() {
        let (tx, rx) = ylong_runtime::sync::mpsc::unbounded_channel();
        let entry = ClientManagerEntry::new(tx);

        // Drop the receiver to simulate channel closure
        drop(rx);

        let result = entry.send_event(ClientEvent::TaskFinished(42));
        assert_eq!(result, false);
    }

    // @tc.name: ut_client_manager_init
    // @tc.desc: Test ClientManager initialization
    // @tc.precon: Runtime is available
    // @tc.step: 1. Call ClientManager::init()
    //           2. Verify ClientManagerEntry is returned
    // @tc.expect: ClientManagerEntry is created successfully
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 0
    #[test]
    fn ut_client_manager_init_001() {
        let entry = ClientManager::init();
        assert!(entry.send_event(ClientEvent::TaskFinished(1)));
    }

    // @tc.name: ut_client_constructor_success
    // @tc.desc: Test successful Client construction
    // @tc.precon: Unix datagram socket creation is available
    // @tc.step: 1. Call Client::constructor with valid pid
    //           2. Verify the return value
    // @tc.expect: Returns Some with sender and socket
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 1
    #[test]
    fn ut_client_constructor_success_001() {
        let result = Client::constructor(12345);
        assert!(result.is_some());
        let (sender, socket) = result.unwrap();
        assert!(sender.send(ClientEvent::TaskFinished(1)).is_ok());
        assert!(Arc::strong_count(&socket) >= 1);
    }

    // @tc.name: ut_client_constructor_zero_pid
    // @tc.desc: Test Client construction with zero pid
    // @tc.precon: Unix datagram socket creation is available
    // @tc.step: 1. Call Client::constructor with pid=0
    //           2. Verify the return value
    // @tc.expect: Returns Some with sender and socket
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 2
    #[test]
    fn ut_client_constructor_zero_pid_001() {
        let result = Client::constructor(0);
        assert!(result.is_some());
        let (sender, socket) = result.unwrap();
        assert!(sender.send(ClientEvent::TaskFinished(1)).is_ok());
        assert!(Arc::strong_count(&socket) >= 1);
    }

    // @tc.name: ut_client_constructor_max_pid
    // @tc.desc: Test Client construction with maximum u64 pid
    // @tc.precon: Unix datagram socket creation is available
    // @tc.step: 1. Call Client::constructor with pid=u64::MAX
    //           2. Verify the return value
    // @tc.expect: Returns Some with sender and socket
    // @tc.type: FUNC
    // @tc.require: issue#ICODTG
    // @tc.level: Level 2
    #[test]
    fn ut_client_constructor_max_pid_001() {
        let result = Client::constructor(u64::MAX);
        assert!(result.is_some());
        let (sender, socket) = result.unwrap();
        assert!(sender.send(ClientEvent::TaskFinished(1)).is_ok());
        assert!(Arc::strong_count(&socket) >= 1);
    }

    // Integration tests for ClientManagerEntry methods
    mod integration_tests {
        use super::*;
        use ylong_runtime::sync::oneshot;

        // @tc.name: ut_client_manager_entry_open_channel_integration
        // @tc.desc: Test open_channel method integration
        // @tc.precon: ClientManager is initialized
        // @tc.step: 1. Initialize ClientManager
        //           2. Call open_channel with valid pid
        //           3. Verify the result
        // @tc.expect: Returns Ok with UnixDatagram
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 1
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_open_channel_integration_001() {
            let entry = ClientManager::init();
            let result = entry.open_channel(12345);
            assert!(result.is_ok());
            let socket = result.unwrap();
            assert!(Arc::strong_count(&socket) >= 1);
        }

        // @tc.name: ut_client_manager_entry_subscribe_integration
        // @tc.desc: Test subscribe method integration
        // @tc.precon: ClientManager is initialized and channel is open
        // @tc.step: 1. Initialize ClientManager
        //           2. Open channel for pid
        //           3. Subscribe to task
        // @tc.expect: Returns ErrorCode::ErrOk
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 1
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_subscribe_integration_001() {
            let entry = ClientManager::init();
            let pid = 12345;
            let tid = 1;
            let uid = 1000;
            let token_id = 2000;

            // First open channel
            let _ = entry.open_channel(pid).unwrap();

            // Then subscribe
            let result = entry.subscribe(tid, pid, uid, token_id);
            assert_eq!(result, ErrorCode::ErrOk);
        }

        // @tc.name: ut_client_manager_entry_subscribe_no_channel
        // @tc.desc: Test subscribe without opening channel first
        // @tc.precon: ClientManager is initialized
        // @tc.step: 1. Initialize ClientManager
        //           2. Attempt to subscribe without opening channel
        // @tc.expect: Returns ErrorCode::ChannelNotOpen
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 2
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_subscribe_no_channel_001() {
            let entry = ClientManager::init();
            let pid = 12345;
            let tid = 1;
            let uid = 1000;
            let token_id = 2000;

            // Attempt to subscribe without opening channel
            let result = entry.subscribe(tid, pid, uid, token_id);
            assert_eq!(result, ErrorCode::ChannelNotOpen);
        }

        // @tc.name: ut_client_manager_entry_unsubscribe_integration
        // @tc.desc: Test unsubscribe method integration
        // @tc.precon: ClientManager is initialized and subscription exists
        // @tc.step: 1. Initialize ClientManager
        //           2. Open channel and subscribe
        //           3. Unsubscribe from task
        // @tc.expect: Returns ErrorCode::ErrOk
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 1
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_unsubscribe_integration_001() {
            let entry = ClientManager::init();
            let pid = 12345;
            let tid = 1;
            let uid = 1000;
            let token_id = 2000;

            // Open channel and subscribe
            let _ = entry.open_channel(pid).unwrap();
            let _ = entry.subscribe(tid, pid, uid, token_id);

            // Then unsubscribe
            let result = entry.unsubscribe(tid);
            assert_eq!(result, ErrorCode::ErrOk);
        }

        // @tc.name: ut_client_manager_entry_unsubscribe_nonexistent
        // @tc.desc: Test unsubscribe for non-existent task
        // @tc.precon: ClientManager is initialized
        // @tc.step: 1. Initialize ClientManager
        //           2. Attempt to unsubscribe from non-existent task
        // @tc.expect: Returns ErrorCode::Other
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 2
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_unsubscribe_nonexistent_001() {
            let entry = ClientManager::init();
            let tid = 99999;

            // Attempt to unsubscribe from non-existent task
            let result = entry.unsubscribe(tid);
            assert_eq!(result, ErrorCode::Other);
        }

        // @tc.name: ut_client_manager_entry_notify_task_finished
        // @tc.desc: Test notify_task_finished method
        // @tc.precon: ClientManager is initialized
        // @tc.step: 1. Initialize ClientManager
        //           2. Call notify_task_finished with valid tid
        // @tc.expect: Method completes without error
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 1
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_notify_task_finished_001() {
            let entry = ClientManager::init();
            let tid = 42;

            // This should complete without error
            entry.notify_task_finished(tid);
        }

        // @tc.name: ut_client_manager_entry_notify_process_terminate
        // @tc.desc: Test notify_process_terminate method
        // @tc.precon: ClientManager is initialized and process exists
        // @tc.step: 1. Initialize ClientManager
        //           2. Open channel for process
        //           3. Terminate the process
        // @tc.expect: Returns ErrorCode::ErrOk
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 1
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_notify_process_terminate_001() {
            let entry = ClientManager::init();
            let pid = 12345;

            // Open channel first
            let _ = entry.open_channel(pid).unwrap();

            // Then terminate
            let result = entry.notify_process_terminate(pid);
            assert_eq!(result, ErrorCode::ErrOk);
        }

        // @tc.name: ut_client_manager_entry_notify_process_terminate_nonexistent
        // @tc.desc: Test notify_process_terminate for non-existent process
        // @tc.precon: ClientManager is initialized
        // @tc.step: 1. Initialize ClientManager
        //           2. Attempt to terminate non-existent process
        // @tc.expect: Returns ErrorCode::ErrOk
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 2
        #[ylong_runtime::test]
        async fn ut_client_manager_entry_notify_process_terminate_nonexistent_001() {
            let entry = ClientManager::init();
            let pid = 99999;

            // Attempt to terminate non-existent process
            let result = entry.notify_process_terminate(pid);
            assert_eq!(result, ErrorCode::ErrOk);
        }
    }

    // Security tests
    mod security_tests {
        use super::*;

        // @tc.name: ut_client_manager_memory_safety
        // @tc.desc: Test memory safety during concurrent operations
        // @tc.precon: Multiple threads accessing ClientManager
        // @tc.step: 1. Initialize ClientManager
        //           2. Spawn multiple threads to perform operations
        //           3. Verify no memory issues
        // @tc.expect: No crashes or memory corruption
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 3
        #[ylong_runtime::test]
        async fn ut_client_manager_memory_safety_001() {
            let entry = ClientManager::init();
            let mut handles = vec![];

            for i in 0..100 {
                let entry_clone = entry.clone();
                let handle = ylong_runtime::spawn(async move {
                    let pid = 1000 + i;
                    let _ = entry_clone.open_channel(pid);
                    let _ = entry_clone.subscribe(i as u32, pid, 1000, 2000);
                    let _ = entry_clone.unsubscribe(i as u32);
                    let _ = entry_clone.notify_process_terminate(pid);
                });
                handles.push(handle);
            }

            for handle in handles {
                let _ = handle.await;
            }

            // Test passes if no panics occurred
        }

        // @tc.name: ut_client_manager_zero_sized_payloads
        // @tc.desc: Test handling of zero-sized payloads
        // @tc.precon: ClientManager is initialized
        // @tc.step: 1. Initialize ClientManager
        //           2. Send events with zero-sized data
        // @tc.expect: System handles gracefully
        // @tc.type: FUNC
        // @tc.require: issue#ICODTG
        // @tc.level: Level 3
        #[ylong_runtime::test]
        async fn ut_client_manager_zero_sized_payloads_001() {
            let entry = ClientManager::init();
            let pid = 12345;

            // Test with empty headers
            let _ = entry.open_channel(pid);
            let _ = entry.subscribe(1, pid, 1000, 2000);

            let empty_headers = Headers::new();
            entry.send_response(1, "HTTP/1.1".to_string(), 200, "OK".to_string(), empty_headers);

            // Should not crash
        }
    }
}