hauchiwa 0.6.1

mod assets;
#[cfg(feature = "asyncrt")]
mod asyncrt;
mod content;
mod generic;
#[cfg(feature = "images")]
mod images;
mod script;
#[cfg(feature = "styles")]
mod styles;
mod svelte;

use std::{borrow::Cow, collections::HashSet, fs, sync::Arc};

use camino::{Utf8Path, Utf8PathBuf};

use crate::{BuildError, GitRepo, Hash32, Item, error::LoaderError};

pub use assets::glob_assets;
#[cfg(feature = "asyncrt")]
pub use asyncrt::async_asset;
pub use content::{Content, glob_content, json, yaml};
#[cfg(feature = "images")]
pub use images::{Image, glob_images};
pub use script::{Script, glob_scripts};
#[cfg(feature = "styles")]
pub use styles::{Style, glob_styles};
pub use svelte::{Svelte, glob_svelte};

pub(crate) trait Loadable: 'static + Send {
    fn name(&self) -> Cow<'static, str>;
    fn load(&mut self) -> Result<(), LoaderError>;
    fn reload(&mut self, set: &HashSet<Utf8PathBuf>) -> Result<bool, LoaderError>;
    fn items(&self) -> Vec<&Item>;
    fn path_base(&self) -> &'static str;
    fn remove(&mut self, obsolete: &HashSet<Utf8PathBuf>) -> bool;
}

impl Loadable for Box<dyn Loadable> {
    #[inline]
    fn name(&self) -> Cow<'static, str> {
        (**self).name()
    }

    #[inline]
    fn load(&mut self) -> Result<(), LoaderError> {
        (**self).load()
    }

    #[inline]
    fn reload(&mut self, set: &HashSet<Utf8PathBuf>) -> Result<bool, LoaderError> {
        (**self).reload(set)
    }

    #[inline]
    fn items(&self) -> Vec<&Item> {
        (**self).items()
    }

    #[inline]
    fn path_base(&self) -> &'static str {
        (**self).path_base()
    }

    #[inline]
    fn remove(&mut self, obsolete: &HashSet<Utf8PathBuf>) -> bool {
        (**self).remove(obsolete)
    }
}

pub struct Loader(Box<dyn FnOnce(LoaderOpts) -> Box<dyn Loadable>>);

pub struct LoaderOpts {
    pub repo: Option<Arc<GitRepo>>,
}

impl Loader {
    #[inline]
    pub(crate) fn with<F, R>(f: F) -> Self
    where
        F: FnOnce(LoaderOpts) -> R + 'static,
        R: Loadable,
    {
        Self(Box::new(move |init| Box::new(f(init))))
    }

    #[inline]
    pub(crate) fn init(self, opts: LoaderOpts) -> Box<dyn Loadable> {
        (self.0)(opts)
    }
}

/// Build execution context, providing facilities for storing artifacts in a
/// content-addressed cache and output directory.
///
/// `Runtime` abstracts filesystem interactions related to build artifact
/// storage, enabling immutability and reproducibility guarantees through
/// content hashing.
#[derive(Clone)]
pub struct Runtime;

impl Runtime {
    /// Persist the given binary `data` under a hash-based path with the
    /// specified file extension `ext`.
    ///
    /// This method computes a 32-bit hash of `data` to uniquely identify the
    /// artifact. It stores the artifact in a local cache directory. The
    /// returned path is a stable, canonicalized URI rooted at `/hash/`.
    ///
    /// # Parameters
    /// - `data`: The raw bytes of the artifact to store.
    /// - `ext`: The file extension (e.g., "js", "css", "webp") used for the
    ///   output artifact, influencing MIME-type recognition and loader behavior.
    ///
    /// # Returns
    /// - On success, returns the logical asset path as a `Utf8PathBuf` rooted
    ///   under `/hash/`, suitable for inclusion in HTML.
    /// - On failure, returns a `BuildError` for I/O or hashing errors.
    pub fn store(&self, data: &[u8], ext: &str) -> Result<Utf8PathBuf, BuildError> {
        let hash = Hash32::hash(data);
        let hash = hash.to_hex();

        let path_temp = Utf8Path::new(".cache/hash").join(&hash);
        let path_dist = Utf8Path::new("dist/hash").join(&hash).with_extension(ext);
        let path_root = Utf8Path::new("/hash/").join(&hash).with_extension(ext);

        if !path_temp.exists() {
            fs::create_dir_all(".cache/hash")?;
            fs::write(&path_temp, data)?;
        }

        let dir = path_dist.parent().unwrap_or(&path_dist);
        fs::create_dir_all(dir)?;
        fs::copy(&path_temp, &path_dist)?;

        Ok(path_root)
    }
}