//! A2 tests for the `change_agent_profile` DTO contract (§15.1):
//! - Request DTO round-trips camelCase JSON `{ projectId, agentId, profileId, rows, cols }`.
//! - `From<ChangeAgentProfileOutput> for ChangeAgentProfileDto` maps the agent and
//!   surfaces `relaunchedSession` only when a live session was swapped (omitted via
//!   `skip_serializing_if` when `None`).
//! - `From<TerminalSession> for TerminalSessionDto` carries id/cwd/size.

use app_tauri_lib::dto::{ChangeAgentProfileDto, ChangeAgentProfileRequestDto};
use application::ChangeAgentProfileOutput;
use domain::ids::{AgentId, NodeId, ProfileId, SessionId};
use domain::terminal::{PtySize, SessionKind, SessionStatus, TerminalSession};
use domain::{Agent, AgentOrigin, ProjectPath};
use serde_json::json;
use uuid::Uuid;

/// Helper: build a minimal validated [`Agent`].
fn make_agent(agent_uuid: u128, profile_uuid: u128) -> Agent {
    Agent::new(
        AgentId::from_uuid(Uuid::from_u128(agent_uuid)),
        "My Agent",
        "agents/my-agent.md",
        ProfileId::from_uuid(Uuid::from_u128(profile_uuid)),
        AgentOrigin::Scratch,
        false,
    )
    .expect("valid agent")
}

/// Helper: build a running [`TerminalSession`] for an agent cell.
fn make_session(session_uuid: u128, node_uuid: u128, agent_uuid: u128) -> TerminalSession {
    let session_id = SessionId::from_uuid(Uuid::from_u128(session_uuid));
    let node_id = NodeId::from_uuid(Uuid::from_u128(node_uuid));
    let agent_id = AgentId::from_uuid(Uuid::from_u128(agent_uuid));
    let cwd = ProjectPath::new("/tmp/project".to_owned()).expect("valid path");
    let size = PtySize::new(30, 100).unwrap();
    let mut session = TerminalSession::starting(
        session_id,
        node_id,
        cwd,
        SessionKind::Agent { agent_id },
        size,
    );
    session.status = SessionStatus::Running;
    session
}

// ---------------------------------------------------------------------------
// Request DTO deserialisation (camelCase round-trip)
// ---------------------------------------------------------------------------

#[test]
fn change_agent_profile_request_deserialises_camelcase() {
    let project_id = Uuid::from_u128(1).to_string();
    let agent_id = Uuid::from_u128(2).to_string();
    let profile_id = Uuid::from_u128(3).to_string();
    let raw = json!({
        "projectId": project_id,
        "agentId": agent_id,
        "profileId": profile_id,
        "rows": 24,
        "cols": 80
    });
    let dto: ChangeAgentProfileRequestDto = serde_json::from_value(raw).unwrap();
    assert_eq!(dto.project_id, project_id);
    assert_eq!(dto.agent_id, agent_id);
    assert_eq!(dto.profile_id, profile_id);
    assert_eq!(dto.rows, 24);
    assert_eq!(dto.cols, 80);
}

#[test]
fn change_agent_profile_request_rejects_snake_case_keys() {
    // The wire contract is camelCase; snake_case keys must NOT satisfy the struct.
    let raw = json!({
        "project_id": Uuid::from_u128(1).to_string(),
        "agent_id": Uuid::from_u128(2).to_string(),
        "profile_id": Uuid::from_u128(3).to_string(),
        "rows": 24,
        "cols": 80
    });
    let res: Result<ChangeAgentProfileRequestDto, _> = serde_json::from_value(raw);
    assert!(res.is_err(), "snake_case keys must not deserialise");
}

// ---------------------------------------------------------------------------
// From<ChangeAgentProfileOutput> for ChangeAgentProfileDto
// ---------------------------------------------------------------------------

#[test]
fn output_maps_agent_and_omits_session_when_no_relaunch() {
    let agent = make_agent(5, 6);
    let out = ChangeAgentProfileOutput {
        agent: agent.clone(),
        relaunched: None,
    };
    let dto = ChangeAgentProfileDto::from(out);
    assert_eq!(dto.agent.0.id, agent.id);
    assert!(dto.relaunched_session.is_none());

    let v = serde_json::to_value(&dto).unwrap();
    // The agent is embedded with its camelCase shape.
    assert_eq!(v["agent"]["id"], agent.id.to_string());
    assert_eq!(v["agent"]["profileId"], agent.profile_id.to_string());
    // No relaunch ⇒ field must be OMITTED from the wire (absent, not null).
    assert!(
        v.get("relaunchedSession").is_none(),
        "no relaunch ⇒ relaunchedSession omitted, got: {v}"
    );
    // No snake_case leak.
    assert!(v.get("relaunched_session").is_none());
}

#[test]
fn output_maps_relaunched_session_camelcase_when_present() {
    let agent = make_agent(7, 8);
    let session = make_session(11, 12, 7);
    let out = ChangeAgentProfileOutput {
        agent: agent.clone(),
        relaunched: Some(session.clone()),
    };
    let dto = ChangeAgentProfileDto::from(out);
    assert!(dto.relaunched_session.is_some());

    let v = serde_json::to_value(&dto).unwrap();
    let rs = v
        .get("relaunchedSession")
        .expect("relaunch present ⇒ relaunchedSession serialised");
    assert_eq!(rs["sessionId"], session.id.to_string());
    assert_eq!(rs["cwd"], "/tmp/project");
    assert_eq!(rs["rows"], 30);
    assert_eq!(rs["cols"], 100);
    // No snake_case leak on the nested DTO.
    assert!(rs.get("session_id").is_none(), "no snake_case leak");
    assert!(v.get("relaunched_session").is_none());
}

// ---------------------------------------------------------------------------
// From<TerminalSession> for TerminalSessionDto
// ---------------------------------------------------------------------------

#[test]
fn terminal_session_maps_to_dto() {
    let session = make_session(21, 22, 23);
    // Exercise the From<TerminalSession> impl directly through the output mapping.
    let out = ChangeAgentProfileOutput {
        agent: make_agent(23, 24),
        relaunched: Some(session.clone()),
    };
    let dto = ChangeAgentProfileDto::from(out);
    let rs = dto.relaunched_session.expect("session present");
    assert_eq!(rs.session_id, session.id.to_string());
    assert_eq!(rs.cwd, "/tmp/project");
    assert_eq!(rs.rows, 30);
    assert_eq!(rs.cols, 100);
}