use serde_json::{Value, json};
use std::{
    fs,
    path::Path,
    process::{Command, Output},
};

struct Fixture {
    dir: tempfile::TempDir,
}
impl Fixture {
    fn new() -> Self {
        let dir = tempfile::tempdir().unwrap();
        for path in [
            "pi",
            "claude/projects/project",
            "codex/sessions",
            "work",
            "other",
        ] {
            fs::create_dir_all(dir.path().join(path)).unwrap();
        }
        let f = Self { dir };
        let root = f.dir.path();
        f.jsonl("pi/pi.jsonl", &[
            json!({"type":"session", "id":"pi-id", "cwd":root.join("work")}),
            json!({"type":"session_info", "name":"Database migration"}),
            json!({"type":"message", "message":{"role":"user","content":"add postgres indexes"}}),
            json!({"type":"message", "message":{"role":"assistant","content":"assistant-only-secret"}}),
        ]);
        f.jsonl("claude/projects/project/claude.jsonl", &[
            json!({"type":"user", "sessionId":"claude-id", "cwd":root.join("other"), "message":{"role":"user","content":"consider migration rollback"}}),
            json!({"type":"ai-title", "aiTitle":"Different topic"}),
        ]);
        f.jsonl("codex/sessions/codex.jsonl", &[
            json!({"type":"session_meta", "payload":{"id":"codex-id", "cwd":root.join("work"), "source":"cli"}}),
            json!({"type":"event_msg", "payload":{"type":"user_message", "message":"refactor rust"}}),
        ]);
        f
    }
    fn jsonl(&self, path: &str, rows: &[Value]) {
        fs::write(
            self.dir.path().join(path),
            rows.iter().map(|v| format!("{v}\n")).collect::<String>(),
        )
        .unwrap();
    }
    fn run(&self, args: &[&str]) -> Output {
        Command::new(env!("CARGO_BIN_EXE_cont"))
            .env("HOME", self.dir.path())
            .env("XDG_DATA_HOME", self.dir.path().join("data"))
            .env_remove("OPENCODE_DB")
            .env("PI_CODING_AGENT_SESSION_DIR", self.dir.path().join("pi"))
            .env("CLAUDE_CONFIG_DIR", self.dir.path().join("claude"))
            .env("CODEX_HOME", self.dir.path().join("codex"))
            .env("RESUME_CACHE_DIR", self.dir.path().join("cache"))
            .current_dir(self.dir.path().join("work"))
            .args(args)
            .output()
            .unwrap()
    }
    fn rows(&self, args: &[&str]) -> Vec<Value> {
        let out = self.run(args);
        assert!(
            out.status.success(),
            "{}",
            String::from_utf8_lossy(&out.stderr)
        );
        serde_json::from_slice(&out.stdout).unwrap()
    }
}

#[test]
fn cli_scope_agent_and_title_first_ranking() {
    let f = Fixture::new();
    assert_eq!(f.rows(&["--json"]).len(), 2);
    assert_eq!(f.rows(&["--json", "--all"]).len(), 3);
    let rows = f.rows(&["--json", "--all", "migration"]);
    assert_eq!(rows.len(), 2);
    assert_eq!(rows[0]["agent"], "pi");
    assert_eq!(rows[0]["match"], "title");
    assert_eq!(rows[1]["agent"], "claude");
    assert_eq!(rows[1]["match"], "message");
    assert_eq!(
        f.rows(&["--json", "--all", "--agent", "codex"])[0]["id"],
        "codex-id"
    );
    assert!(
        f.rows(&["--json", "--all", "assistant-only-secret"])
            .is_empty()
    );
}

#[test]
fn omp_discovery_and_custom_opencode_database() {
    let f = Fixture::new();
    let root = f.dir.path();
    fs::create_dir_all(root.join(".omp/agent/sessions/project")).unwrap();
    f.jsonl(
        ".omp/agent/sessions/project/session.jsonl",
        &[
            json!({"type":"title","title":"OMP task"}),
            json!({"type":"session","id":"omp-id","cwd":root.join("work")}),
            json!({"type":"message","message":{"role":"user","content":"unicorn request"}}),
        ],
    );
    let rows = f.rows(&["--json", "--agent", "omp", "unicorn"]);
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0]["title"], "OMP task");
    assert_eq!(rows[0]["match"], "message");
    assert!(
        rows[0]["command"]
            .as_str()
            .unwrap()
            .contains("omp '--resume'")
    );
    let database = root.join("custom.db");
    let conn = rusqlite::Connection::open(&database).unwrap();
    conn.execute_batch("CREATE TABLE session (id TEXT, directory TEXT, title TEXT, time_updated INTEGER, parent_id TEXT, time_archived INTEGER);
        CREATE TABLE message (id TEXT, session_id TEXT, time_created INTEGER, data TEXT);
        CREATE TABLE part (id TEXT, message_id TEXT, session_id TEXT, time_created INTEGER, data TEXT);").unwrap();
    conn.execute(
        "INSERT INTO session VALUES ('ses_test', ?1, 'OpenCode task', 1000, NULL, NULL)",
        [root.join("other").to_str().unwrap()],
    )
    .unwrap();
    let rows = f.rows(&[
        "--json",
        "--all",
        "--agent",
        "opencode",
        "--opencode-db",
        database.to_str().unwrap(),
    ]);
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0]["id"], "ses_test");
    assert!(
        rows[0]["command"]
            .as_str()
            .unwrap()
            .contains("OPENCODE_DB=")
    );
    assert!(
        f.rows(&["--json", "--all", "--agent", "opencode"])
            .is_empty()
    );
}

#[test]
fn additional_root_and_invalid_cache_are_safe() {
    let f = Fixture::new();
    let extra = f.dir.path().join("extra");
    fs::create_dir(&extra).unwrap();
    fs::write(
        extra.join("extra.jsonl"),
        format!(
            "{}\n",
            json!({"type":"session","id":"extra","cwd":f.dir.path().join("work")})
        ),
    )
    .unwrap();
    assert_eq!(
        f.rows(&["--json", "--all", "--pi-dir", extra.to_str().unwrap()])
            .len(),
        4
    );
    // Changing the configured roots must not leak old cached results into the final list.
    assert_eq!(f.rows(&["--json", "--all"]).len(), 3);
    fs::write(f.dir.path().join("cache/sessions-v1.json"), "bad cache").unwrap();
    assert_eq!(f.rows(&["--json", "--all"]).len(), 3);
}

#[test]
fn non_tty_help_and_no_cache() {
    let f = Fixture::new();
    assert!(f.run(&["--help"]).status.success());
    let out = f.run(&[]);
    assert!(!out.status.success());
    assert!(String::from_utf8_lossy(&out.stderr).contains("needs a terminal"));
    assert_eq!(f.rows(&["--json", "--no-cache"]).len(), 2);
    assert!(!f.dir.path().join("cache").exists());
    assert!(f.rows(&["--json", "--limit", "0"]).is_empty());
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        let cache = f.dir.path().join("cache/sessions-v1.json");
        assert_eq!(
            fs::metadata(cache).unwrap().permissions().mode() & 0o777,
            0o600
        );
    }
}

#[test]
#[cfg(unix)]
fn symlinked_working_directory_matches() {
    let f = Fixture::new();
    let link = f.dir.path().join("alias");
    std::os::unix::fs::symlink(f.dir.path().join("work"), &link).unwrap();
    assert_eq!(f.rows(&["--json", "-C", link.to_str().unwrap()]).len(), 2);
    assert!(Path::new(f.rows(&["--json"])[0]["cwd"].as_str().unwrap()).is_absolute());
}