//! Core world extensions execute through the snapshot loader and the actual VFS.
use sausage::{
    exec::{Command, Exec, Options, Stream},
    world::World,
};
use std::{path::Path, sync::Arc};
const BUNDLE: &str = include_str!("../../js/core-ext-test-bundle.js");
struct Author(Arc<dyn Exec>);
#[async_trait::async_trait]
impl Exec for Author {
    async fn exec(
        &self,
        command: Command,
        mut options: Options,
        output: &mut (dyn for<'a> FnMut(Stream, &'a [u8]) + Send),
    ) -> anyhow::Result<i32> {
        for (key, value) in [
            ("GIT_AUTHOR_NAME", "Test"),
            ("GIT_AUTHOR_EMAIL", "test@example.com"),
            ("GIT_COMMITTER_NAME", "Test"),
            ("GIT_COMMITTER_EMAIL", "test@example.com"),
        ] {
            options.env.push((key.into(), value.into()));
        }
        self.0.exec(command, options, output).await
    }
}
fn copy_tree(from: &Path, to: &Path) -> anyhow::Result<()> {
    std::fs::create_dir_all(to)?;
    for entry in std::fs::read_dir(from)? {
        let entry = entry?;
        let dest = to.join(entry.file_name());
        if entry.file_type()?.is_dir() {
            copy_tree(&entry.path(), &dest)?;
        } else {
            std::fs::copy(entry.path(), dest)?;
        }
    }
    Ok(())
}
fn write(root: &Path, path: &str, text: &str) -> anyhow::Result<()> {
    let path = root.join(path);
    std::fs::create_dir_all(path.parent().unwrap())?;
    std::fs::write(path, text)?;
    Ok(())
}
#[tokio::test(flavor = "current_thread")]
async fn init_seeds_config_tools_and_one_source_commit() -> anyhow::Result<()> {
    let dir = tempfile::tempdir()?;
    let bundle = dir.path().join("bundle");
    let target = crate::common::build_git();
    std::fs::create_dir_all(bundle.join("bin"))?;
    std::fs::copy(
        target.join("wasm32-wasip2/release/git.wasm"),
        bundle.join("bin/git.wasm"),
    )?;
    write(&bundle, "src/sausage/README.md", "World source")?;
    write(
        &bundle,
        "etc/sausage/config.yaml",
        include_str!("../../../config/config.yaml"),
    )?;
    let destination = dir.path().join("new-world");
    let initialized = std::process::Command::new(env!("CARGO_BIN_EXE_sausage"))
        .arg("init")
        .arg(&destination)
        .arg("--userland")
        .arg(&bundle)
        .env("PI_PROXY_BASE_URL", "https://proxy.test")
        .env("PI_PROXY_API_KEY", "fixture-key")
        .stdin(std::process::Stdio::null())
        .output()?;
    assert!(
        initialized.status.success(),
        "{}",
        String::from_utf8_lossy(&initialized.stderr)
    );
    let world = World::open(&destination)?;
    assert!(destination.join("world/bin/git").exists());
    let config = sausage::harness::config::Config::read(&world.root).await?;
    assert_eq!(config.proxy.base_url, "https://proxy.test");
    assert_eq!(config.proxy.api_key, "fixture-key");
    let source = destination.join("world/src/sausage");
    for (args, expected) in [
        (vec!["symbolic-ref", "HEAD"], "refs/heads/main"),
        (vec!["rev-list", "--count", "HEAD"], "1"),
    ] {
        let result = std::process::Command::new("git")
            .args(args)
            .current_dir(&source)
            .output()?;
        assert!(
            result.status.success(),
            "{}",
            String::from_utf8_lossy(&result.stderr)
        );
        assert_eq!(String::from_utf8(result.stdout)?.trim(), expected);
    }
    assert!(
        World::init(&destination, &bundle)
            .await
            .err()
            .unwrap()
            .to_string()
            .contains("already exists")
    );
    Ok(())
}

#[tokio::test(flavor = "current_thread")]
async fn core_extensions() -> anyhow::Result<()> {
    let repo = Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap();
    let target = crate::common::build_git();
    let dir = tempfile::tempdir()?;
    let world = World::open(dir.path())?;
    let disk = dir.path().join("world");
    std::fs::create_dir_all(disk.join("bin"))?;
    for binary in ["git", "tar"] {
        std::fs::copy(
            target.join(format!("wasm32-wasip2/release/{binary}.wasm")),
            disk.join(format!("bin/{binary}.wasm")),
        )?;
    }
    let source = disk.join("src/sausage");
    for name in ["core", "models", "prompt", "conversations"] {
        copy_tree(
            &repo.join("extensions").join(name),
            &source.join("extensions").join(name),
        )?;
    }
    write(
        &disk,
        "etc/sausage/config.yaml",
        include_str!("../../../config/config.yaml"),
    )?;
    write(
        &source,
        "skills/builtin/SKILL.md",
        "---\nname: builtin-skill\ndescription: Builtin skill\n---\nInstructions",
    )?;
    write(
        &source,
        "extensions/fixture/server.ts",
        r#"import {defineExtension,defineTool} from '@earendil-works/pi-durable';
import {obj} from '@earendil-works/pi-schema';
import {State} from '../conversations/api.ts';
export const order=500;
export default host=>{host.implement({name:'models.pin'},{pin:async()=>globalThis.modelPin});host.onOpen(async()=>{globalThis.core={selection:host.need({name:'models'}),conversations:host.need({name:'conversations'}),State,metadata:host.metadata}});return defineExtension({name:'fixture',tools:['read','write'].map(name=>defineTool({name,description:name,parameters:obj({}),execute:async()=>({output:[]})}))})};"#,
    )?;
    write(&disk, "AGENTS.md", "Outside instructions")?;
    write(&disk, "project/.git/HEAD", "ref: refs/heads/main")?;
    write(&disk, "project/AGENTS.md", "Root instructions")?;
    write(&disk, "project/sub/AGENTS.md", "Nested instructions")?;
    write(
        &disk,
        "project/.sausage/skills/project/SKILL.md",
        "---\nname: project-skill\ndescription: Project skill\n---\nInstructions",
    )?;
    assert!(
        std::process::Command::new("git")
            .args(["init", "-b", "main"])
            .arg(&source)
            .status()?
            .success()
    );
    assert!(
        std::process::Command::new("git")
            .args(["add", "."])
            .current_dir(&source)
            .status()?
            .success()
    );
    assert!(
        std::process::Command::new("git")
            .args([
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "--no-gpg-sign",
                "-m",
                "core fixtures"
            ])
            .current_dir(&source)
            .status()?
            .success()
    );
    let exec: Arc<dyn Exec> = Arc::new(Author(sausage::process::exec(World {
        root: world.root.clone(),
        host_dir: world.host_dir.clone(),
        processes: world.processes.clone(),
    })?));
    sausage::harness::run_module(world, exec, BUNDLE).await
}