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/*
 * Copyright 2020 Fluence Labs Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use super::ModuleManifest;
use crate::ModuleInfoResult;
use crate::ModuleInfoError;
use crate::extract_custom_sections_by_name;
use crate::try_as_one_section;

use wasmer_core::Module as WasmerModule;
use fluence_sdk_main::MANIFEST_SECTION_NAME;
use walrus::ModuleConfig;
use walrus::Module;

use std::borrow::Cow;
use std::path::Path;
use std::convert::TryInto;

pub fn extract_from_path<P>(wasm_module_path: P) -> ModuleInfoResult<Option<ModuleManifest>>
where
    P: AsRef<Path>,
{
    let module = ModuleConfig::new()
        .parse_file(wasm_module_path)
        .map_err(ModuleInfoError::CorruptedWasmFile)?;

    extract_from_module(&module)
}

pub fn extract_from_module(wasm_module: &Module) -> ModuleInfoResult<Option<ModuleManifest>> {
    let sections = extract_custom_sections_by_name(&wasm_module, MANIFEST_SECTION_NAME)?;
    if sections.is_empty() {
        return Ok(None);
    }

    let section = try_as_one_section(&sections, MANIFEST_SECTION_NAME)?;

    let manifest = match section {
        Cow::Borrowed(bytes) => (*bytes).try_into(),
        Cow::Owned(vec) => vec.as_slice().try_into(),
    }?;

    Ok(Some(manifest))
}

pub fn extract_from_wasmer_module(
    wasmer_module: &WasmerModule,
) -> ModuleInfoResult<Option<ModuleManifest>> {
    let sections = wasmer_module.custom_sections(MANIFEST_SECTION_NAME);
    let sections = match sections {
        Some(sections) => sections,
        None => return Ok(None),
    };

    let section = try_as_one_section(&sections, MANIFEST_SECTION_NAME)?;
    let manifest = section.as_slice().try_into()?;

    Ok(Some(manifest))
}