// SPDX-License-Identifier: GPL-3.0-only

//! `super-stt-indexer` — top-level orchestration.

use std::path::PathBuf;

use anyhow::Context;

use clap::Parser;

use log::{error, info, warn};

use super_stt_forge::{ForgeClient, RepoRef};

mod assets;

mod carryforward;

mod index_json;

mod license;

mod local;

mod manifest;

mod registry_toml;

mod resolve;

#[derive(Parser, Debug)]

#[command(version, about)]

struct Args {

    #[command(subcommand)]

    command: Command,

}

#[derive(clap::Subcommand, Debug)]

enum Command {

    /// Build the published index from `registry.toml` + GitHub releases.

    Build(BuildArgs),

    /// Build a local index from staged backends — offline, no GitHub. For

    /// testing the daemon's download/install pipeline against a localhost

    /// static server.

    Local(local::LocalArgs),

}

#[derive(clap::Args, Debug)]

struct BuildArgs {

    /// Path to `registry.toml` to read.

    #[arg(long, default_value = "registry/registry.toml")]

    registry: PathBuf,

    /// Path to the previously-published `index.json` (for carry-forward). If

    /// missing, falls through cleanly — bootstrap mode.

    #[arg(long)]

    prior_index: Option<PathBuf>,

    /// Where to write the new `index.json`.

    #[arg(long, default_value = "index.json")]

    out: PathBuf,

}

pub struct BuildFailure {

    pub error: String,

    pub attempted_version: Option<String>,

    pub attempted_tag: Option<String>,

}

#[tokio::main(flavor = "multi_thread", worker_threads = 4)]

async fn main() -> anyhow::Result<()> {

    // Workspace reqwest uses rustls without a bundled provider; install one.

    super_stt_forge::install_crypto_provider();

    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    match Args::parse().command {

        Command::Build(
args2
) => 
run_build2
(args).await,

        Command::Local(
args10
) => 
local::run10
(
&args10
),

    }

}

/// Build the published index from `registry.toml` + GitHub releases.

async fn run_build(args: BuildArgs) -> anyhow::Result<()> {

    let registry_text = std::fs::read_to_string(&args.registry)

        .with_context(|| 
format!0
("reading {}", 
args.registry.display()0
))
?0
;

    let registry = registry_toml::Registry::parse(&registry_text)
?0
;

    let prior = match args.prior_index.as_ref() {

        Some(p) if p.exists() => {

            let text = std::fs::read_to_string(p)?;

            Some(serde_json::from_str::<index_json::Index>(&text)?)

        }

        _ => None,

    };

    // Downloads release assets (subprocess bundles can be multi-GB) — use the

    // shared download client, not a timeout-less `Client::new()` that could hang

    // forever on a stalled connection.

    let http = super_stt_forge::http::download_client();

    let now_iso = chrono_now_iso();

    let mut out_backends: Vec<index_json::IndexBackend> = Vec::new();

    for (id, entry) in &registry.0 {

        if entry.removed {

            info!("skip `{id}` — removed");

            continue;

        }

        let client = super_stt_forge::client(entry.forge);

        // A malformed `repo` string must not abort the whole build — route it

        // through the same per-entry carry-forward path every other failure uses

        // (Tier 1 #28), instead of `?`-propagating out of the loop.

        let built = match RepoRef::parse(&entry.repo) {

            Ok(repo) => build_entry(client.as_ref(), &http, id, entry, &repo).await,

            Err(e) => Err(BuildFailure {

                error: format!("invalid repo `{}`: {e}", entry.repo),

                attempted_version: None,

                attempted_tag: None,

            }),

        };

        match built {

            Ok(b) => out_backends.push(b),

            Err(failure) => {

                error!("entry `{id}` failed: {}", failure.error);

                let prior_entry = prior

                    .as_ref()

                    .and_then(|p| p.backends.iter().find(|b| b.id == *id));

                if let Some(carried) = carryforward::maybe_carry_forward(

                    id,

                    prior_entry,

                    &failure.error,

                    failure.attempted_version.as_deref().unwrap_or(""),

                    failure.attempted_tag.as_deref().unwrap_or(""),

                    &now_iso,

                    carryforward::MAX_STALENESS_DAYS,

                ) {

                    warn!(

                        "entry `{id}` — carrying forward last-known-good (v{})",

                        carried.version

                    );

                    out_backends.push(carried);

                }

            }

        }

    }

    ensure_unique_sources(&out_backends)
?0
;

    let index = index_json::Index {

        schema_version: index_json::SCHEMA_VERSION,

        generated_at: now_iso,

        min_client: index_json::MIN_CLIENT.into(),

        backends: out_backends,

    };

    let text = serde_json::to_string_pretty(&index)
?0
 + "\n";

    super_stt_registry_types::fs::write_atomic(&args.out, text.as_bytes())

        .with_context(|| 
format!0
("writing {}", 
args.out.display()0
))
?0
;

    info!(

        "wrote {} ({} backends)",

        args.out.display(),

        index.backends.len()

    );

    Ok(())

}

async fn build_entry(

    client: &dyn ForgeClient,

    http: &reqwest::Client,

    id: &str,

    entry: &registry_toml::Entry,

    repo: &RepoRef,

) -> Result<index_json::IndexBackend, BuildFailure> {

    let resolved = resolve::resolve(client, repo, entry)

        .await

        .map_err(|e| BuildFailure {

            error: format!("{e:#}"),

            attempted_version: None,

            attempted_tag: None,

        })?;

    // From here the version + tag are known; record them on every later failure

    // so the carry-forward path can report what it tried to build.

    let attempted_version = Some(resolved.version.to_string());

    let attempted_tag = Some(resolved.tag.clone());

    let fail = |e: &dyn std::fmt::Display| BuildFailure {

        error: format!("{e:#}"),

        attempted_version: attempted_version.clone(),

        attempted_tag: attempted_tag.clone(),

    };

    // The manifest is the `backend.toml` release asset: parse + validate the

    // exact bytes that get hashed, so reviewed == pinned == installed. A release

    // without the asset is not installable (no synthesize fallback) — fail the

    // entry.

    let (url, _declared_size) =

        assets::resolve_url("backend.toml", &resolved.release.assets).map_err(|e| 
fail0
(
&e0
))
?0
;

    let (bytes, sha256) = assets::fetch_manifest_asset(http, &url)

        .await

        .map_err(|e| 
fail0
(
&e0
))
?0
;

    let size = bytes.len() as u64;

    let text = String::from_utf8(bytes).map_err(|e| 
fail0
(
&e0
))
?0
;

    let m = manifest::Manifest::parse(&text).map_err(|e| 
fail0
(
&e0
))
?0
;

    let manifest_pin = Some(index_json::IndexAsset { url, size, sha256 });

    manifest::validate(&m, &resolved.version, &entry.repo).map_err(|e| 
fail0
(
&e0
))
?0
;

    let idx_assets = resolve_index_assets(http, &m, &resolved.release.assets)

        .await

        .map_err(|e| 
fail0
(
&e0
))
?0
;

    Ok(into_index_backend(

        id,

        m,

        resolved.version.to_string(),

        resolved.tag,

        idx_assets,

        manifest_pin,

    ))

}

/// A unique temp path for staging one downloaded asset part during validation.

fn temp_part_path() -> std::path::PathBuf {

    use std::sync::atomic::{AtomicU64, Ordering};

    static N: AtomicU64 = AtomicU64::new(0);

    let n = N.fetch_add(1, Ordering::Relaxed);

    std::env::temp_dir().join(format!("stt-idx-{}-{n}.part", std::process::id()))

}

/// RAII owner of the downloaded part files: removes them all on drop, so a

/// mid-loop download/validation error can't leak the (possibly multi-GB) parts

/// already fetched (Tier 1 #29). A path is registered *before* its download so

/// even a partially-written part is cleaned up.

struct TempParts(Vec<std::path::PathBuf>);

impl TempParts {

    fn new() -> Self {

        Self(Vec::new())

    }

    fn register(&mut self, path: std::path::PathBuf) {

        self.0.push(path);

    }

    fn paths(&self) -> &[std::path::PathBuf] {

        &self.0

    }

}

impl Drop for TempParts {

    fn drop(&mut self) {

        for p in &self.0 {

            let _ = std::fs::remove_file(p);

        }

    }

}

/// Build the index entry for one subprocess variant from its downloaded part

/// pins: a single-file pin (`url`/`size`/`sha256`) or a multi-part pin.

fn subprocess_index_entry(

    sa: &manifest::SubprocessAsset,

    mut pins: Vec<index_json::IndexAsset>,

) -> index_json::IndexSubprocessAsset {

    let (url, size, sha256, parts) = if sa.is_multipart() {

        (None, None, None, pins)

    } else {

        let p = pins.remove(0);

        (Some(p.url), Some(p.size), Some(p.sha256), Vec::new())

    };

    index_json::IndexSubprocessAsset {

        target: sa.target.clone(),

        accel: sa.accel.to_string(),

        cuda_major: sa.cuda_major,

        cuda_sm: sa.cuda_sm,

        cudnn: sa.cudnn,

        url,

        size,

        sha256,

        parts,

    }

}

/// Resolve and hash the binary artifacts a release declares — the wasm

/// component or each subprocess variant — into the index's asset block.

async fn resolve_index_assets(

    http: &reqwest::Client,

    m: &manifest::Manifest,

    release_assets: &[super_stt_forge::ReleaseAsset],

) -> anyhow::Result<index_json::IndexAssets> {

    let mut idx_assets = index_json::IndexAssets::default();

    if let Some(wasm) = &m.assets.wasm {

        let (url, size) = assets::resolve_url(wasm, release_assets)
?0
;

        let sha = assets::fetch_wasm_and_hash(http, &url, wasm).await
?0
;

        idx_assets.wasm = Some(index_json::IndexAsset {

            url,

            size,

            sha256: sha,

        });

    }

    for 
sa0
 in &m.assets.subprocess {

        // Download each part (a single-file variant has one) to a temp file,

        // hashing it, then validate the reassembled archive before pinning.

        // `TempParts` removes every downloaded part on scope exit — including on

        // an early `?` from `resolve_url`/`download_to_file`/validation — so a

        // mid-loop error can't leak multi-GB temp files (Tier 1 #29).

        let files = sa.release_files();

        let mut tmp = TempParts::new();

        let mut pins: Vec<index_json::IndexAsset> = Vec::with_capacity(files.len());

        for f in &files {

            let (url, _) = assets::resolve_url(f, release_assets)?;

            let dest = temp_part_path();

            tmp.register(dest.clone());

            let (size, sha256) = assets::download_to_file(http, &url, f, &dest).await?;

            pins.push(index_json::IndexAsset { url, size, sha256 });

        }

        assets::validate_subprocess_parts(tmp.paths(), &sa.label(), &m.backend.entrypoint)?;

        idx_assets.subprocess.push(subprocess_index_entry(sa, pins));

        // `tmp` drops here (validation done), removing the parts.

    }

    Ok(idx_assets)

}

/// Assemble the published `IndexBackend` from a validated manifest, its

/// resolved `version` + `tag`, and the hashed assets. Thin wrapper over the

/// canonical [`index_json::IndexBackend::from_manifest`] synthesis (shared with

/// the daemon's Custom-repo and local-dir install paths) — the indexer supplies

/// the maintainer-declared `id` rather than deriving it from `source`.

pub(crate) fn into_index_backend(

    id: &str,

    m: manifest::Manifest,

    version: String,

    tag: String,

    assets: index_json::IndexAssets,

    manifest: Option<index_json::IndexAsset>,

) -> index_json::IndexBackend {

    index_json::IndexBackend::from_manifest(id.to_string(), m, version, tag, assets, manifest)

}

/// A backend's `source` is its unique identity. Two distinct entries that

/// collide on `source` would be indistinguishable to every daemon (the

/// daemon's `dedup_sources` guard silently drops all but the first), so a

/// collision must never be published — fail the build instead.

fn ensure_unique_sources(backends: &[index_json::IndexBackend]) -> anyhow::Result<()> {

    let mut seen: std::collections::HashMap<&str, &str> = std::collections::HashMap::new();

    for b in 
backends6
 {

        if let Some(
prev_id2
) = seen.insert(b.source.as_str(), b.id.as_str()) {

            anyhow::bail!(

                "duplicate source `{}` shared by entries `{}` and `{}`; each backend must have a distinct source",

                b.source,

                prev_id,

                b.id,

            );

        }

    }

    Ok(())

}

fn chrono_now_iso() -> String {

    chrono::Utc::now().format("%Y-%m-%dT%H:%M:%SZ").to_string()

}

#[cfg(test)]

mod tests {

    use super::*;

    fn backend(id: &str, source: &str) -> index_json::IndexBackend {

        index_json::IndexBackend {

            id: id.into(),

            source: source.into(),

            version: "1.0.0".into(),

            tag: "v1.0.0".into(),

            name: id.into(),

            description: None,

            license: "Apache-2.0".into(),

            kind: "wasm".into(),

            contract: "v1".into(),

            entrypoint: format!("{id}.wasm"),

            allowed_hosts: Vec::new(),

            online: false,

            supports_gpu: false,

            supports_cpu: true,

            models: Vec::new(),

            secrets: Vec::new(),

            options: Vec::new(),

            assets: index_json::IndexAssets::default(),

            index_stale: None,

            manifest: None,

        }

    }

    #[test]

    fn unique_sources_pass() {

        let backends = vec![

            backend("mistral", "github.com/x/y/mistral"),

            backend("openai", "github.com/x/y/openai"),

        ];

        ensure_unique_sources(&backends).unwrap();

    }

    #[test]

    fn duplicate_sources_are_rejected() {

        let backends = vec![

            backend("mistral", "github.com/x/y"),

            backend("openai", "github.com/x/y"),

        ];

        let err = ensure_unique_sources(&backends).unwrap_err();

        assert!(err.to_string().contains("duplicate source"));

    }

}