use anyhow::Result;
use app_test_support::McpProcess;
use app_test_support::create_fake_rollout_with_text_elements;
use app_test_support::create_mock_responses_server_repeating_assistant;
use app_test_support::rollout_path;
use app_test_support::to_response;
use chrono::Utc;
use codex_app_server_protocol::JSONRPCResponse;
use codex_app_server_protocol::RequestId;
use codex_app_server_protocol::SessionSource;
use codex_app_server_protocol::ThreadItem;
use codex_app_server_protocol::ThreadReadParams;
use codex_app_server_protocol::ThreadReadResponse;
use codex_app_server_protocol::TurnStatus;
use codex_app_server_protocol::UserInput;
use codex_protocol::user_input::ByteRange;
use codex_protocol::user_input::TextElement;
use pretty_assertions::assert_eq;
use std::fs::FileTimes;
use std::path::Path;
use std::path::PathBuf;
use tempfile::TempDir;
use tokio::time::timeout;

const DEFAULT_READ_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(10);

#[tokio::test]
async fn thread_read_returns_summary_without_turns() -> Result<()> {
    let server = create_mock_responses_server_repeating_assistant("Done").await;
    let codex_home = TempDir::new()?;
    create_config_toml(codex_home.path(), &server.uri())?;

    let preview = "Saved user message";
    let text_elements = [TextElement::new(
        ByteRange { start: 0, end: 5 },
        Some("<note>".into()),
    )];
    let conversation_id = create_fake_rollout_with_text_elements(
        codex_home.path(),
        "2025-01-05T12-00-00",
        "2025-01-05T12:00:00Z",
        preview,
        text_elements
            .iter()
            .map(|elem| serde_json::to_value(elem).expect("serialize text element"))
            .collect(),
        Some("mock_provider"),
        None,
    )?;

    let mut mcp = McpProcess::new(codex_home.path()).await?;
    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;

    let read_id = mcp
        .send_thread_read_request(ThreadReadParams {
            thread_id: conversation_id.clone(),
            include_turns: false,
        })
        .await?;
    let read_resp: JSONRPCResponse = timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_response_message(RequestId::Integer(read_id)),
    )
    .await??;
    let ThreadReadResponse { thread } = to_response::<ThreadReadResponse>(read_resp)?;

    assert_eq!(thread.id, conversation_id);
    assert_eq!(thread.preview, preview);
    assert_eq!(thread.model_provider, "mock_provider");
    assert!(thread.path.as_ref().expect("thread path").is_absolute());
    assert_eq!(thread.cwd, PathBuf::from("/"));
    assert_eq!(thread.cli_version, "0.0.0");
    assert_eq!(thread.source, SessionSource::Cli);
    assert_eq!(thread.git_info, None);
    assert_eq!(thread.turns.len(), 0);

    Ok(())
}

#[tokio::test]
async fn thread_read_can_include_turns() -> Result<()> {
    let server = create_mock_responses_server_repeating_assistant("Done").await;
    let codex_home = TempDir::new()?;
    create_config_toml(codex_home.path(), &server.uri())?;

    let preview = "Saved user message";
    let text_elements = vec![TextElement::new(
        ByteRange { start: 0, end: 5 },
        Some("<note>".into()),
    )];
    let conversation_id = create_fake_rollout_with_text_elements(
        codex_home.path(),
        "2025-01-05T12-00-00",
        "2025-01-05T12:00:00Z",
        preview,
        text_elements
            .iter()
            .map(|elem| serde_json::to_value(elem).expect("serialize text element"))
            .collect(),
        Some("mock_provider"),
        None,
    )?;

    let mut mcp = McpProcess::new(codex_home.path()).await?;
    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;

    let read_id = mcp
        .send_thread_read_request(ThreadReadParams {
            thread_id: conversation_id.clone(),
            include_turns: true,
        })
        .await?;
    let read_resp: JSONRPCResponse = timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_response_message(RequestId::Integer(read_id)),
    )
    .await??;
    let ThreadReadResponse { thread } = to_response::<ThreadReadResponse>(read_resp)?;

    assert_eq!(thread.turns.len(), 1);
    let turn = &thread.turns[0];
    assert_eq!(turn.status, TurnStatus::Completed);
    assert_eq!(turn.items.len(), 1, "expected user message item");
    match &turn.items[0] {
        ThreadItem::UserMessage { content, .. } => {
            assert_eq!(
                content,
                &vec![UserInput::Text {
                    text: preview.to_string(),
                    text_elements: text_elements.clone().into_iter().map(Into::into).collect(),
                }]
            );
        }
        other => panic!("expected user message item, got {other:?}"),
    }

    Ok(())
}

#[tokio::test]
async fn thread_read_does_not_change_updated_at_or_mtime() -> Result<()> {
    let server = create_mock_responses_server_repeating_assistant("Done").await;
    let codex_home = TempDir::new()?;
    create_config_toml(codex_home.path(), &server.uri())?;

    let preview = "Saved user message";
    let filename_ts = "2025-01-05T12-00-00";
    let meta_rfc3339 = "2025-01-05T12:00:00Z";
    let expected_updated_at_rfc3339 = "2025-01-07T00:00:00Z";
    let conversation_id = create_fake_rollout_with_text_elements(
        codex_home.path(),
        filename_ts,
        meta_rfc3339,
        preview,
        Vec::new(),
        Some("mock_provider"),
        None,
    )?;
    let rollout_file_path = rollout_path(codex_home.path(), filename_ts, &conversation_id);
    set_rollout_mtime(rollout_file_path.as_path(), expected_updated_at_rfc3339)?;

    let before_modified = std::fs::metadata(&rollout_file_path)?.modified()?;

    let mut mcp = McpProcess::new(codex_home.path()).await?;
    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;

    let read_id = mcp
        .send_thread_read_request(ThreadReadParams {
            thread_id: conversation_id,
            include_turns: false,
        })
        .await?;
    let read_resp: JSONRPCResponse = timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_response_message(RequestId::Integer(read_id)),
    )
    .await??;
    let ThreadReadResponse { thread } = to_response::<ThreadReadResponse>(read_resp)?;

    let expected_updated_at = chrono::DateTime::parse_from_rfc3339(expected_updated_at_rfc3339)?
        .with_timezone(&Utc)
        .timestamp();
    assert_eq!(thread.updated_at, expected_updated_at);

    let after_modified = std::fs::metadata(&rollout_file_path)?.modified()?;
    assert_eq!(after_modified, before_modified);

    Ok(())
}

// Helper to create a config.toml pointing at the mock model server.
fn create_config_toml(codex_home: &Path, server_uri: &str) -> std::io::Result<()> {
    let config_toml = codex_home.join("config.toml");
    std::fs::write(
        config_toml,
        format!(
            r#"
model = "mock-model"
approval_policy = "never"
sandbox_mode = "read-only"

model_provider = "mock_provider"

[model_providers.mock_provider]
name = "Mock provider for test"
base_url = "{server_uri}/v1"
wire_api = "responses"
request_max_retries = 0
stream_max_retries = 0
"#
        ),
    )
}

fn set_rollout_mtime(path: &Path, updated_at_rfc3339: &str) -> Result<()> {
    let parsed = chrono::DateTime::parse_from_rfc3339(updated_at_rfc3339)?.with_timezone(&Utc);
    let times = FileTimes::new().set_modified(parsed.into());
    std::fs::OpenOptions::new()
        .append(true)
        .open(path)?
        .set_times(times)?;
    Ok(())
}