use std::fs;
use std::path::PathBuf;
use serde::{Serialize, Deserialize};
use rust_util::util_file;

#[derive(Serialize, Deserialize)]
pub struct DockerBuildConfig {
    pub image: Option<String>,
    pub mirror: Option<String>,
}

pub fn load_docker_build_config_or_default() -> DockerBuildConfig {
    load_docker_build_config().unwrap_or_else(|| {
        DockerBuildConfig {
            image: Some("rust".into()),
            mirror: None,
        }
    })
}

pub fn load_docker_build_config() -> Option<DockerBuildConfig> {
    let config = find_docker_build_config_file()?;
    success!("Find config file: {:?}", config);
    let config_content = fs::read_to_string(&config).map_err(|e| {
        failure!("Read config file: {:?}, failed: {}", config, e);
        e
    }).ok()?;
    serde_json::from_str(&config_content).map_err(|e| {
        failure!("Parse config file: {:?}, failed: {}", config, e);
        e
    }).ok()
}

fn find_docker_build_config_file() -> Option<PathBuf> {
    util_file::read_config(None, &vec![
        // "dockerbuild.json".into(),
        "~/.dockerbuild.json".into(),
        "/etc/dockerbuild.json".into(),
    ])
}