use anyhow::Result;
use codex_core::features::Feature;
use codex_protocol::ThreadId;
use codex_protocol::protocol::EventMsg;
use codex_protocol::protocol::RolloutItem;
use codex_protocol::protocol::RolloutLine;
use codex_protocol::protocol::SessionMeta;
use codex_protocol::protocol::SessionMetaLine;
use codex_protocol::protocol::SessionSource;
use codex_protocol::protocol::UserMessageEvent;
use codex_state::STATE_DB_FILENAME;
use core_test_support::load_sse_fixture_with_id;
use core_test_support::responses::mount_sse_sequence;
use core_test_support::responses::start_mock_server;
use core_test_support::test_codex::test_codex;
use pretty_assertions::assert_eq;
use std::fs;
use tokio::time::Duration;
use uuid::Uuid;

fn sse_completed(id: &str) -> String {
    load_sse_fixture_with_id("../fixtures/completed_template.json", id)
}

#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn new_thread_is_recorded_in_state_db() -> Result<()> {
    let server = start_mock_server().await;
    let mut builder = test_codex().with_config(|config| {
        config.features.enable(Feature::Sqlite);
    });
    let test = builder.build(&server).await?;

    let thread_id = test.session_configured.session_id;
    let rollout_path = test.codex.rollout_path().expect("rollout path");
    let db_path = test.config.codex_home.join(STATE_DB_FILENAME);

    for _ in 0..100 {
        if tokio::fs::try_exists(&db_path).await.unwrap_or(false) {
            break;
        }
        tokio::time::sleep(Duration::from_millis(25)).await;
    }

    let db = test.codex.state_db().expect("state db enabled");

    let mut metadata = None;
    for _ in 0..100 {
        metadata = db.get_thread(thread_id).await?;
        if metadata.is_some() {
            break;
        }
        tokio::time::sleep(Duration::from_millis(25)).await;
    }

    let metadata = metadata.expect("thread should exist in state db");
    assert_eq!(metadata.id, thread_id);
    assert_eq!(metadata.rollout_path, rollout_path);

    Ok(())
}

#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn backfill_scans_existing_rollouts() -> Result<()> {
    let server = start_mock_server().await;

    let uuid = Uuid::now_v7();
    let thread_id = ThreadId::from_string(&uuid.to_string())?;
    let rollout_rel_path = format!("sessions/2026/01/27/rollout-2026-01-27T12-00-00-{uuid}.jsonl");
    let rollout_rel_path_for_hook = rollout_rel_path.clone();

    let mut builder = test_codex()
        .with_pre_build_hook(move |codex_home| {
            let rollout_path = codex_home.join(&rollout_rel_path_for_hook);
            let parent = rollout_path
                .parent()
                .expect("rollout path should have parent");
            fs::create_dir_all(parent).expect("should create rollout directory");

            let session_meta_line = SessionMetaLine {
                meta: SessionMeta {
                    id: thread_id,
                    forked_from_id: None,
                    timestamp: "2026-01-27T12:00:00Z".to_string(),
                    cwd: codex_home.to_path_buf(),
                    originator: "test".to_string(),
                    cli_version: "test".to_string(),
                    source: SessionSource::default(),
                    model_provider: None,
                    base_instructions: None,
                },
                git: None,
            };

            let lines = [
                RolloutLine {
                    timestamp: "2026-01-27T12:00:00Z".to_string(),
                    item: RolloutItem::SessionMeta(session_meta_line),
                },
                RolloutLine {
                    timestamp: "2026-01-27T12:00:01Z".to_string(),
                    item: RolloutItem::EventMsg(EventMsg::UserMessage(UserMessageEvent {
                        message: "hello from backfill".to_string(),
                        images: None,
                        local_images: Vec::new(),
                        text_elements: Vec::new(),
                    })),
                },
            ];

            let jsonl = lines
                .iter()
                .map(|line| serde_json::to_string(line).expect("rollout line should serialize"))
                .collect::<Vec<_>>()
                .join("\n");
            fs::write(&rollout_path, format!("{jsonl}\n")).expect("should write rollout file");
        })
        .with_config(|config| {
            config.features.enable(Feature::Sqlite);
        });

    let test = builder.build(&server).await?;

    let db_path = test.config.codex_home.join(STATE_DB_FILENAME);
    let rollout_path = test.config.codex_home.join(&rollout_rel_path);
    let default_provider = test.config.model_provider_id.clone();

    for _ in 0..20 {
        if tokio::fs::try_exists(&db_path).await.unwrap_or(false) {
            break;
        }
        tokio::time::sleep(Duration::from_millis(25)).await;
    }

    let db = test.codex.state_db().expect("state db enabled");

    let mut metadata = None;
    for _ in 0..40 {
        metadata = db.get_thread(thread_id).await?;
        if metadata.is_some() {
            break;
        }
        tokio::time::sleep(Duration::from_millis(25)).await;
    }

    let metadata = metadata.expect("backfilled thread should exist in state db");
    assert_eq!(metadata.id, thread_id);
    assert_eq!(metadata.rollout_path, rollout_path);
    assert_eq!(metadata.model_provider, default_provider);
    assert!(metadata.has_user_event);

    Ok(())
}

#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn user_messages_persist_in_state_db() -> Result<()> {
    let server = start_mock_server().await;
    mount_sse_sequence(
        &server,
        vec![sse_completed("resp-1"), sse_completed("resp-2")],
    )
    .await;

    let mut builder = test_codex().with_config(|config| {
        config.features.enable(Feature::Sqlite);
    });
    let test = builder.build(&server).await?;

    let db_path = test.config.codex_home.join(STATE_DB_FILENAME);
    for _ in 0..100 {
        if tokio::fs::try_exists(&db_path).await.unwrap_or(false) {
            break;
        }
        tokio::time::sleep(Duration::from_millis(25)).await;
    }

    test.submit_turn("hello from sqlite").await?;
    test.submit_turn("another message").await?;

    let db = test.codex.state_db().expect("state db enabled");
    let thread_id = test.session_configured.session_id;

    let mut metadata = None;
    for _ in 0..100 {
        metadata = db.get_thread(thread_id).await?;
        if metadata
            .as_ref()
            .map(|entry| entry.has_user_event)
            .unwrap_or(false)
        {
            break;
        }
        tokio::time::sleep(Duration::from_millis(25)).await;
    }

    let metadata = metadata.expect("thread should exist in state db");
    assert!(metadata.has_user_event);

    Ok(())
}