use anyhow::{Result, bail};
use turbo_rcstr::RcStr;
use turbo_tasks::{FxIndexMap, ReadRef, Vc};
use turbo_tasks_fs::FileSystemPath;
use turbo_tasks_hash::{Xxh3Hash64Hasher, encode_hex};
use turbopack_core::{chunk::ModuleId, version::Version};
use turbopack_ecmascript::chunk::EcmascriptChunkContent;

use super::content_entry::EcmascriptBrowserChunkContentEntries;

#[turbo_tasks::value(serialization = "none")]
pub(super) struct EcmascriptBrowserChunkVersion {
    pub(super) chunk_path: String,
    pub(super) entries_hashes: FxIndexMap<ReadRef<ModuleId>, u64>,
}

#[turbo_tasks::value_impl]
impl EcmascriptBrowserChunkVersion {
    #[turbo_tasks::function]
    pub async fn new(
        output_root: FileSystemPath,
        chunk_path: FileSystemPath,
        content: Vc<EcmascriptChunkContent>,
    ) -> Result<Vc<Self>> {
        let output_root = output_root.clone();
        let chunk_path = chunk_path.clone();
        let chunk_path = if let Some(path) = output_root.get_path_to(&chunk_path) {
            path
        } else {
            bail!(
                "chunk path {} is not in client root {}",
                chunk_path.to_string(),
                output_root.to_string()
            );
        };
        let entries = EcmascriptBrowserChunkContentEntries::new(content).await?;
        let mut entries_hashes =
            FxIndexMap::with_capacity_and_hasher(entries.len(), Default::default());
        for (id, entry) in entries.iter() {
            entries_hashes.insert(id.clone(), *entry.hash.await?);
        }
        Ok(EcmascriptBrowserChunkVersion {
            chunk_path: chunk_path.to_string(),
            entries_hashes,
        }
        .cell())
    }
}

#[turbo_tasks::value_impl]
impl Version for EcmascriptBrowserChunkVersion {
    #[turbo_tasks::function]
    fn id(&self) -> Vc<RcStr> {
        let mut hasher = Xxh3Hash64Hasher::new();
        hasher.write_ref(&self.chunk_path);
        let sorted_hashes = {
            let mut hashes: Vec<_> = self.entries_hashes.values().copied().collect();
            hashes.sort();
            hashes
        };
        for hash in sorted_hashes {
            hasher.write_value(hash);
        }
        let hash = hasher.finish();
        let hex_hash = encode_hex(hash);
        Vc::cell(hex_hash.into())
    }
}