//! DTO contract tests for local model-server IPC.

use app_tauri_lib::dto::{
    ModelServerConfigDto, ModelServerKindDto, SaveModelServerRequestDto, StopPolicyDto,
    save_model_server_input,
};
use domain::model_server::{
    ExecutablePath, LocalModelRef, LocalModelServerConfig, LocalModelServerKind, ModelPath,
    ModelServerEndpoint,
};
use domain::{LocalModelServerId, StopPolicy};
use serde_json::json;
use uuid::Uuid;

fn sid(n: u128) -> LocalModelServerId {
    LocalModelServerId::from_uuid(Uuid::from_u128(n))
}

fn domain_config(id: LocalModelServerId, model_id: &str) -> LocalModelServerConfig {
    LocalModelServerConfig::new(
        id,
        LocalModelServerKind::LlamaCpp,
        "Local Qwen",
        ModelServerEndpoint::new("http://localhost:8080", 8080).unwrap(),
        LocalModelRef::new(
            model_id,
            "Qwen",
            Some(ModelPath::new("/models/qwen.gguf").unwrap()),
            "qwen3-coder",
        )
        .unwrap(),
        Some(ExecutablePath::new("/usr/bin/llama-server").unwrap()),
        vec!["--ctx-size".to_owned(), "4096".to_owned()],
        true,
        StopPolicy::StopOnAppExit,
    )
    .unwrap()
}

#[test]
fn model_server_dto_serialises_flat_camelcase_wire_shape() {
    let dto = ModelServerConfigDto::from_domain(domain_config(sid(35), "internal-model-id"));

    let value = serde_json::to_value(dto).unwrap();

    assert_eq!(value["id"], sid(35).to_string());
    assert_eq!(value["kind"], "llamaCpp");
    assert_eq!(value["baseURL"], "http://localhost:8080/v1");
    assert_eq!(value["modelPath"], "/models/qwen.gguf");
    assert_eq!(value["servedModelName"], "qwen3-coder");
    assert_eq!(value["binaryPath"], "/usr/bin/llama-server");
    assert_eq!(value["stopPolicy"], "stopOnAppExit");
    assert!(value.get("model").is_none(), "domain model must not leak");
    assert!(value.get("endpoint").is_none(), "domain endpoint must not leak");
}

#[test]
fn model_server_dto_deserialises_flat_wire_shape_and_generates_model_id() {
    let raw = json!({
        "id": sid(36).to_string(),
        "kind": "llamaCpp",
        "name": "Local Qwen",
        "baseURL": "http://localhost:8081",
        "port": 8081,
        "modelPath": "/models/qwen.gguf",
        "servedModelName": "qwen3-coder",
        "binaryPath": "/usr/bin/llama-server",
        "args": ["--ctx-size", "4096"],
        "autoStart": true,
        "stopPolicy": "stopOnAppExit"
    });

    let request = SaveModelServerRequestDto {
        config: serde_json::from_value(raw).unwrap(),
    };
    let input = save_model_server_input(request, None).unwrap();

    assert_eq!(input.config.id, sid(36));
    assert_eq!(input.config.kind, LocalModelServerKind::LlamaCpp);
    assert_eq!(input.config.endpoint.base_url, "http://localhost:8081/v1");
    assert_eq!(
        input.config.model.path.unwrap().as_str(),
        "/models/qwen.gguf"
    );
    assert_eq!(input.config.model.served_name, "qwen3-coder");
    assert_eq!(input.config.model.label, "qwen3-coder");
    assert!(!input.config.model.id.is_empty());
}

#[test]
fn model_server_dto_preserves_existing_internal_model_id_on_upsert() {
    let existing = domain_config(sid(37), "stable-internal-id");
    let dto = ModelServerConfigDto {
        id: sid(37).to_string(),
        kind: ModelServerKindDto::LlamaCpp,
        name: "Updated Qwen".to_owned(),
        base_url: "http://localhost:8082/v1".to_owned(),
        port: 8082,
        model_path: Some("/models/qwen-updated.gguf".to_owned()),
        served_model_name: "qwen3-coder-updated".to_owned(),
        binary_path: Some("/usr/bin/llama-server".to_owned()),
        args: Vec::new(),
        auto_start: true,
        stop_policy: StopPolicyDto::StopOnAppExit,
    };

    let config = dto.into_domain(Some(&existing)).unwrap();

    assert_eq!(config.model.id, "stable-internal-id");
    assert_eq!(config.model.served_name, "qwen3-coder-updated");
}