use std::fs;

use camino::Utf8Path;
use camino::Utf8PathBuf;

    let current_checksum = compute_checksum();
    let manifest_path = Utf8PathBuf::try_from(cargo_px_env::generated_pkg_manifest_path()?)?;
    let mut manifest = load_manifest(&manifest_path)?;
    let old_checksum = &mut manifest["package"]["metadata"]["px"]["source"]["checksum"];
    if let Some(old_checksum) = old_checksum.as_str() {
        if old_checksum == current_checksum {
            return Ok(());
        }
    }

        let mut package_path = cargo_px_env::generated_pkg_manifest_path()?;
        package_path.pop();
        package_path.push("src");
        package_path.push("icu_data");
        package_path

        let mut path = manifest_path.clone();
        path.pop();
        path.push("src");
        path.push("icu_data");
        path.canonicalize()?

    // Update checksum
    *old_checksum = toml_edit::value(current_checksum);
    save_manifest(&manifest_path, manifest)?;

}
fn save_manifest(path: &Utf8Path, manifest: toml_edit::Document) -> Result<(), std::io::Error> {
    fs::write(path, manifest.to_string())
}
fn load_manifest(path: &Utf8Path) -> Result<toml_edit::Document, toml_edit::TomlError> {
    // Read the contents of the Cargo.toml file
    let toml_content = fs::read_to_string(path).expect("Failed to read Cargo.toml");
    // Parse it
    toml_content.parse::<toml_edit::Document>()
}
fn compute_checksum() -> String {
    let version_tag = format!(
        "{}:{}",
        SourceData::LATEST_TESTED_CLDR_TAG,
        SourceData::LATEST_TESTED_ICUEXPORT_TAG
    );
    let current_checksum = xxhash_rust::xxh3::xxh3_128(version_tag.as_bytes());
    format!("{current_checksum:x}")

toml_edit.workspace    = true
xxhash-rust.workspace  = true

[package.metadata.px.generate]
# The generator is a binary in the current workspace. 
# It's the only generator type we support at the moment.
generator_type = "cargo_workspace_binary"
# The name of the binary.
generator_name = "icu-data"
[package.metadata.px.source]
checksum = "396f9a15499d1e3de0eb8765ab1e3ce"

[package.metadata.px.generate]
# The generator is a binary in the current workspace. 
# It's the only generator type we support at the moment.
generator_type = "cargo_workspace_binary"
# The name of the binary.
generator_name = "icu-data"

toml_edit            = "0.19.8"