/*
 * Marine WebAssembly runtime
 *
 * Copyright (C) 2024 Fluence DAO
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation version 3 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

use marine_core::MarineCore;
use marine_core::MarineCoreConfig;
use marine_core::IValue;
use marine_wasm_backend_traits::WasmBackend;
use marine_wasmtime_backend::WasmtimeWasmBackend;

use once_cell::sync::Lazy;

static GREETING_WASM_BYTES: Lazy<Vec<u8>> = Lazy::new(|| {
    std::fs::read("../examples/greeting/artifacts/greeting.wasm")
        .expect("../examples/greeting/artifacts/greeting.wasm should presence")
});

#[tokio::test]
pub async fn greeting_basic() {
    let backend = WasmtimeWasmBackend::new_async().unwrap();
    let mut marine_core = MarineCore::new(MarineCoreConfig::new(backend, None)).unwrap();
    marine_core
        .load_module("greeting", &GREETING_WASM_BYTES, <_>::default())
        .await
        .unwrap_or_else(|e| panic!("can't load a module into Marine: {:?}", e));

    let result1 = marine_core
        .call_async(
            "greeting",
            "greeting",
            &[IValue::String(String::from("Fluence"))],
        )
        .await
        .unwrap_or_else(|e| panic!("can't invoke greeting: {:?}", e));

    let result2 = marine_core
        .call_async("greeting", "greeting", &[IValue::String(String::from(""))])
        .await
        .unwrap_or_else(|e| panic!("can't invoke greeting: {:?}", e));

    assert_eq!(result1, vec![IValue::String(String::from("Hi, Fluence"))]);
    assert_eq!(result2, vec![IValue::String(String::from("Hi, "))]);
}

#[tokio::test]
// test loading module with the same name twice
pub async fn non_unique_module_name() {
    let backend = WasmtimeWasmBackend::new_async().unwrap();
    let mut marine_core = MarineCore::new(MarineCoreConfig::new(backend, None)).unwrap();
    let module_name = String::from("greeting");
    marine_core
        .load_module(&module_name, &GREETING_WASM_BYTES, <_>::default())
        .await
        .unwrap_or_else(|e| panic!("can't load a module into Marine: {:?}", e));

    let load_result = marine_core
        .load_module(&module_name, &GREETING_WASM_BYTES, <_>::default())
        .await;
    assert!(load_result.is_err());
    assert!(std::matches!(
        load_result.err().unwrap(),
        marine_core::MError::NonUniqueModuleName(_)
    ));
}

#[tokio::test]
#[allow(unused_variables)]
// test calling Marine with non-exist module and function names
pub async fn non_exist_module_func() {
    let backend = WasmtimeWasmBackend::new_async().unwrap();
    let mut marine_core = MarineCore::new(MarineCoreConfig::new(backend, None)).unwrap();
    marine_core
        .load_module("greeting", &GREETING_WASM_BYTES, <_>::default())
        .await
        .unwrap_or_else(|e| panic!("can't load a module into Marine: {:?}", e));

    let module_name = "greeting";
    let function_name = "greeting";
    let non_exist_name = String::from("_");

    let call_result1 = marine_core
        .call_async(
            non_exist_name.as_str(),
            function_name,
            &[IValue::String(String::from("Fluence"))],
        )
        .await;

    let call_result2 = marine_core
        .call_async(
            module_name,
            non_exist_name.as_str(),
            &[IValue::String(String::from("Fluence"))],
        )
        .await;

    let call_result3 = marine_core
        .call_async(
            non_exist_name.as_str(),
            non_exist_name.as_str(),
            &[IValue::String(String::from("Fluence"))],
        )
        .await;

    assert!(call_result1.is_err());
    assert!(matches!(
        call_result1.err().unwrap(),
        marine_core::MError::NoSuchModule(non_exist_name)
    ));

    assert!(call_result2.is_err());
    assert!(matches!(
        call_result2.err().unwrap(),
        marine_core::MError::NoSuchFunction(module_name, non_exist_name)
    ));

    assert!(call_result3.is_err());
    // at first, the module name should be checked
    assert!(matches!(
        call_result3.err().unwrap(),
        marine_core::MError::NoSuchModule(non_exist_name)
    ));
}