use std::{env, error::Error};

use esp_config::generate_config_from_yaml_definition;
use jiff::Timestamp;

#[macro_export]
macro_rules! assert_unique_features {
    ($($feature:literal),+ $(,)?) => {
        assert!(
            (0 $(+ cfg!(feature = $feature) as usize)+ ) <= 1,
            "Exactly zero or one of the following features must be enabled: {}",
            [$($feature),+].join(", ")
        );
    };
}

fn main() -> Result<(), Box<dyn Error>> {
    println!("cargo::rustc-check-cfg=cfg(embedded_test)");

    // Log and defmt are mutually exclusive features. The main technical reason is
    // that allowing both would make the exact panicking behaviour a fragile
    // implementation detail.
    assert_unique_features!("log-04", "defmt");

    let build_time = match env::var("SOURCE_DATE_EPOCH") {
        Ok(val) => Timestamp::from_microsecond(val.parse::<i64>()?).unwrap(),
        Err(_) => Timestamp::now(),
    };

    let build_time_formatted = build_time.strftime("%H:%M:%S");
    let build_date_formatted = build_time.strftime("%Y-%m-%d");

    println!("cargo::rustc-env=ESP_BOOTLOADER_BUILD_TIME={build_time_formatted}");
    println!("cargo::rustc-env=ESP_BOOTLOADER_BUILD_DATE={build_date_formatted}");

    // emit config
    println!("cargo:rerun-if-changed=./esp_config.yml");
    let cfg_yaml = std::fs::read_to_string("./esp_config.yml")
        .expect("Failed to read esp_config.yml for esp-bootloader-esp-idf");
    generate_config_from_yaml_definition(&cfg_yaml, true, true, None).unwrap();

    Ok(())
}