//! L6 tests for the agent DTO (de)serialisation contract: camelCase on the
//! wire, embedded [`Agent`] shape preserved, `parse_agent_id` error behaviour,
//! and `From<LaunchAgentOutput>` for [`TerminalSessionDto`].

use app_tauri_lib::dto::{
    parse_agent_id, AgentDto, AgentListDto, CreateAgentRequestDto, LaunchAgentRequestDto,
    TerminalSessionDto, UpdateAgentContextRequestDto,
};
use application::{CreateAgentOutput, LaunchAgentOutput, ListAgentsOutput};
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")
}

// ---------------------------------------------------------------------------
// AgentDto / AgentListDto serialisation
// ---------------------------------------------------------------------------

#[test]
fn agent_dto_serialises_camelcase() {
    let agent = make_agent(1, 2);
    let dto = AgentDto(agent.clone());
    let v = serde_json::to_value(&dto).unwrap();

    assert_eq!(v["id"], agent.id.to_string());
    assert_eq!(v["name"], "My Agent");
    assert_eq!(v["contextPath"], "agents/my-agent.md", "camelCase key");
    assert_eq!(v["profileId"], ProfileId::from_uuid(Uuid::from_u128(2)).to_string());
    assert_eq!(v["synchronized"], false);
    // origin: tagged `{ "type": "scratch" }`
    assert_eq!(v["origin"]["type"], "scratch");
    // no snake_case leak
    assert!(v.get("context_path").is_none());
    assert!(v.get("profile_id").is_none());
}

#[test]
fn agent_list_dto_is_transparent_array() {
    let out = ListAgentsOutput {
        agents: vec![make_agent(1, 2), make_agent(3, 4)],
    };
    let dto = AgentListDto::from(out);
    let v = serde_json::to_value(&dto).unwrap();
    let arr = v.as_array().expect("transparent array");
    assert_eq!(arr.len(), 2);
    assert_eq!(arr[0]["name"], "My Agent");
}

#[test]
fn create_agent_output_maps_to_agent_dto() {
    let agent = make_agent(5, 6);
    let out = CreateAgentOutput { agent: agent.clone() };
    let dto = AgentDto::from(out);
    assert_eq!(dto.0.id, agent.id);
}

// ---------------------------------------------------------------------------
// Request DTO deserialisation
// ---------------------------------------------------------------------------

#[test]
fn create_agent_request_deserialises_camelcase() {
    let project_id = Uuid::from_u128(10).to_string();
    let profile_id = Uuid::from_u128(20).to_string();
    let raw = json!({
        "projectId": project_id,
        "name": "Backend Dev",
        "profileId": profile_id,
        "initialContent": "# Hello"
    });
    let dto: CreateAgentRequestDto = serde_json::from_value(raw).unwrap();
    assert_eq!(dto.project_id, project_id);
    assert_eq!(dto.name, "Backend Dev");
    assert_eq!(dto.profile_id, profile_id);
    assert_eq!(dto.initial_content.as_deref(), Some("# Hello"));
}

#[test]
fn create_agent_request_initial_content_defaults_to_none() {
    let raw = json!({
        "projectId": Uuid::nil().to_string(),
        "name": "Agent",
        "profileId": Uuid::nil().to_string()
    });
    let dto: CreateAgentRequestDto = serde_json::from_value(raw).unwrap();
    assert!(dto.initial_content.is_none());
}

#[test]
fn update_agent_context_request_deserialises_camelcase() {
    let raw = json!({
        "projectId": Uuid::nil().to_string(),
        "agentId": Uuid::nil().to_string(),
        "content": "# Updated"
    });
    let dto: UpdateAgentContextRequestDto = serde_json::from_value(raw).unwrap();
    assert_eq!(dto.content, "# Updated");
}

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

// ---------------------------------------------------------------------------
// parse_agent_id
// ---------------------------------------------------------------------------

#[test]
fn parse_agent_id_accepts_uuid() {
    let id = Uuid::from_u128(99);
    assert_eq!(
        parse_agent_id(&id.to_string()).unwrap(),
        AgentId::from_uuid(id)
    );
}

#[test]
fn parse_agent_id_rejects_garbage() {
    let err = parse_agent_id("not-a-uuid").expect_err("garbage rejected");
    assert_eq!(err.code, "INVALID");
}

// ---------------------------------------------------------------------------
// From<LaunchAgentOutput> for TerminalSessionDto
// ---------------------------------------------------------------------------

#[test]
fn launch_agent_output_maps_to_terminal_session_dto() {
    let session_id = SessionId::from_uuid(Uuid::from_u128(7));
    let node_id = NodeId::from_uuid(Uuid::from_u128(8));
    let agent_id = AgentId::from_uuid(Uuid::from_u128(9));
    let cwd = ProjectPath::new("/tmp/project".to_owned()).expect("valid path");
    let size = PtySize::new(24, 80).unwrap();

    let mut session = TerminalSession::starting(
        session_id,
        node_id,
        cwd,
        SessionKind::Agent { agent_id },
        size,
    );
    session.status = SessionStatus::Running;

    let out = LaunchAgentOutput { session };
    let dto = TerminalSessionDto::from(out);

    assert_eq!(dto.session_id, session_id.to_string());
    assert_eq!(dto.cwd, "/tmp/project");
    assert_eq!(dto.rows, 24);
    assert_eq!(dto.cols, 80);

    // Also verify camelCase serialisation.
    let v = serde_json::to_value(&dto).unwrap();
    assert_eq!(v["sessionId"], session_id.to_string());
    assert_eq!(v["cwd"], "/tmp/project");
    assert!(v.get("session_id").is_none(), "no snake_case leak");
}