use crate::blobservice::BlobService;
use crate::blobservice::SledBlobService;
use crate::chunkservice::ChunkService;
use crate::chunkservice::SledChunkService;
use crate::directoryservice::DirectoryService;
use crate::directoryservice::SledDirectoryService;
use crate::nar::NARRenderer;
use crate::proto;
use crate::proto::DirectoryNode;
use crate::proto::FileNode;
use crate::proto::SymlinkNode;
use lazy_static::lazy_static;
use std::path::Path;
use tempfile::TempDir;

const HELLOWORLD_BLOB_CONTENTS: &[u8] = b"Hello World!";
const EMPTY_BLOB_CONTENTS: &[u8] = b"";

lazy_static! {
    static ref HELLOWORLD_BLOB_DIGEST: Vec<u8> =
        blake3::hash(HELLOWORLD_BLOB_CONTENTS).as_bytes().to_vec();
    static ref EMPTY_BLOB_DIGEST: Vec<u8> = blake3::hash(EMPTY_BLOB_CONTENTS).as_bytes().to_vec();
    static ref DIRECTORY_WITH_KEEP: proto::Directory = proto::Directory {
        directories: vec![],
        files: vec![FileNode {
            name: ".keep".to_string(),
            digest: EMPTY_BLOB_DIGEST.to_vec(),
            size: 0,
            executable: false,
        }],
        symlinks: vec![],
    };
    static ref DIRECTORY_COMPLICATED: proto::Directory = proto::Directory {
        directories: vec![DirectoryNode {
            name: "keep".to_string(),
            digest: DIRECTORY_WITH_KEEP.digest(),
            size: DIRECTORY_WITH_KEEP.size(),
        }],
        files: vec![FileNode {
            name: ".keep".to_string(),
            digest: EMPTY_BLOB_DIGEST.to_vec(),
            size: 0,
            executable: false,
        }],
        symlinks: vec![SymlinkNode {
            name: "aa".to_string(),
            target: "/nix/store/somewhereelse".to_string(),
        }],
    };
}

fn gen_blob_service(p: &Path) -> impl BlobService {
    SledBlobService::new(p.join("blobs")).unwrap()
}

fn gen_chunk_service(p: &Path) -> impl ChunkService + Clone {
    SledChunkService::new(p.join("chunks")).unwrap()
}

fn gen_directory_service(p: &Path) -> impl DirectoryService {
    SledDirectoryService::new(p.join("directories")).unwrap()
}

#[test]
fn single_symlink() {
    let tmpdir = TempDir::new().unwrap();
    let renderer = NARRenderer::new(
        gen_blob_service(tmpdir.path()),
        gen_chunk_service(tmpdir.path()),
        gen_directory_service(tmpdir.path()),
    );
    // don't put anything in the stores, as we don't actually do any requests.

    let mut buf: Vec<u8> = vec![];

    renderer
        .write_nar(
            &mut buf,
            crate::proto::node::Node::Symlink(SymlinkNode {
                name: "doesntmatter".to_string(),
                target: "/nix/store/somewhereelse".to_string(),
            }),
        )
        .expect("must succeed");

    assert_eq!(
        buf,
        vec![
            13, 0, 0, 0, 0, 0, 0, 0, 110, 105, 120, 45, 97, 114, 99, 104, 105, 118, 101, 45, 49, 0,
            0, 0, // "nix-archive-1"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            7, 0, 0, 0, 0, 0, 0, 0, 115, 121, 109, 108, 105, 110, 107, 0, // "symlink"
            6, 0, 0, 0, 0, 0, 0, 0, 116, 97, 114, 103, 101, 116, 0, 0, // target
            24, 0, 0, 0, 0, 0, 0, 0, 47, 110, 105, 120, 47, 115, 116, 111, 114, 101, 47, 115, 111,
            109, 101, 119, 104, 101, 114, 101, 101, 108, 115,
            101, // "/nix/store/somewhereelse"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0 // ")"
        ]
    );
}

/// Make sure the NARRenderer fails if the blob size in the proto node doesn't
/// match what's in the store.
#[test]
fn single_file_missing_blob() {
    let tmpdir = TempDir::new().unwrap();

    let blob_service = gen_blob_service(tmpdir.path());
    let chunk_service = gen_chunk_service(tmpdir.path());

    let renderer = NARRenderer::new(
        blob_service,
        chunk_service,
        gen_directory_service(tmpdir.path()),
    );
    let mut buf: Vec<u8> = vec![];

    let e = renderer
        .write_nar(
            &mut buf,
            crate::proto::node::Node::File(FileNode {
                name: "doesntmatter".to_string(),
                digest: HELLOWORLD_BLOB_DIGEST.to_vec(),
                size: HELLOWORLD_BLOB_CONTENTS.len() as u32,
                executable: false,
            }),
        )
        .expect_err("must fail");

    if let crate::nar::RenderError::BlobNotFound(actual_digest, _) = e {
        assert_eq!(HELLOWORLD_BLOB_DIGEST.to_vec(), actual_digest);
    } else {
        panic!("unexpected error")
    }
}

/// Make sure the NAR Renderer fails if the returned blob meta has another size
/// than specified in the proto node.
#[test]
fn single_file_wrong_blob_size() {
    let tmpdir = TempDir::new().unwrap();

    let blob_service = gen_blob_service(tmpdir.path());
    let chunk_service = gen_chunk_service(tmpdir.path());

    // insert blob and chunk into the stores
    chunk_service
        .put(HELLOWORLD_BLOB_CONTENTS.to_vec())
        .unwrap();

    blob_service
        .put(
            &HELLOWORLD_BLOB_DIGEST,
            proto::BlobMeta {
                chunks: vec![proto::blob_meta::ChunkMeta {
                    digest: HELLOWORLD_BLOB_DIGEST.to_vec(),
                    size: HELLOWORLD_BLOB_CONTENTS.len() as u32,
                }],
                ..Default::default()
            },
        )
        .unwrap();

    let renderer = NARRenderer::new(
        blob_service,
        chunk_service,
        gen_directory_service(tmpdir.path()),
    );
    let mut buf: Vec<u8> = vec![];

    let e = renderer
        .write_nar(
            &mut buf,
            crate::proto::node::Node::File(FileNode {
                name: "doesntmatter".to_string(),
                digest: HELLOWORLD_BLOB_DIGEST.to_vec(),
                size: 42, // <- note the wrong size here!
                executable: false,
            }),
        )
        .expect_err("must fail");

    if let crate::nar::RenderError::UnexpectedBlobMeta(digest, _, expected_size, actual_size) = e {
        assert_eq!(
            digest,
            HELLOWORLD_BLOB_DIGEST.to_vec(),
            "expect digest to match"
        );
        assert_eq!(
            expected_size, 42,
            "expected expected size to be what's passed in the request"
        );
        assert_eq!(
            actual_size,
            HELLOWORLD_BLOB_CONTENTS.len() as u32,
            "expected actual size to be correct"
        );
    } else {
        panic!("unexpected error")
    }
}

#[test]
fn single_file() {
    let tmpdir = TempDir::new().unwrap();

    let blob_service = gen_blob_service(tmpdir.path());
    let chunk_service = gen_chunk_service(tmpdir.path());

    chunk_service
        .put(HELLOWORLD_BLOB_CONTENTS.to_vec())
        .unwrap();

    blob_service
        .put(
            &HELLOWORLD_BLOB_DIGEST,
            proto::BlobMeta {
                chunks: vec![proto::blob_meta::ChunkMeta {
                    digest: HELLOWORLD_BLOB_DIGEST.to_vec(),
                    size: HELLOWORLD_BLOB_CONTENTS.len() as u32,
                }],
                ..Default::default()
            },
        )
        .unwrap();

    let renderer = NARRenderer::new(
        blob_service,
        chunk_service,
        gen_directory_service(tmpdir.path()),
    );
    let mut buf: Vec<u8> = vec![];

    renderer
        .write_nar(
            &mut buf,
            crate::proto::node::Node::File(FileNode {
                name: "doesntmatter".to_string(),
                digest: HELLOWORLD_BLOB_DIGEST.to_vec(),
                size: HELLOWORLD_BLOB_CONTENTS.len() as u32,
                executable: false,
            }),
        )
        .expect("must succeed");

    assert_eq!(
        buf,
        vec![
            13, 0, 0, 0, 0, 0, 0, 0, 110, 105, 120, 45, 97, 114, 99, 104, 105, 118, 101, 45, 49, 0,
            0, 0, // "nix-archive-1"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            7, 0, 0, 0, 0, 0, 0, 0, 114, 101, 103, 117, 108, 97, 114, 0, // "regular"
            8, 0, 0, 0, 0, 0, 0, 0, 99, 111, 110, 116, 101, 110, 116, 115, // "contents"
            12, 0, 0, 0, 0, 0, 0, 0, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 0, 0,
            0, 0, // "Hello World!"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0 // ")"
        ]
    );
}

#[test]
fn test_complicated() {
    let tmpdir = TempDir::new().unwrap();

    let blob_service = gen_blob_service(tmpdir.path());
    let chunk_service = gen_chunk_service(tmpdir.path());
    let directory_service = gen_directory_service(tmpdir.path());

    // put all data into the stores.
    for blob_contents in [HELLOWORLD_BLOB_CONTENTS, EMPTY_BLOB_CONTENTS] {
        let digest = chunk_service.put(blob_contents.to_vec()).unwrap();

        blob_service
            .put(
                &digest,
                proto::BlobMeta {
                    chunks: vec![proto::blob_meta::ChunkMeta {
                        digest: digest.to_vec(),
                        size: blob_contents.len() as u32,
                    }],
                    ..Default::default()
                },
            )
            .unwrap();
    }

    directory_service.put(DIRECTORY_WITH_KEEP.clone()).unwrap();
    directory_service
        .put(DIRECTORY_COMPLICATED.clone())
        .unwrap();

    let renderer = NARRenderer::new(blob_service, chunk_service, directory_service);
    let mut buf: Vec<u8> = vec![];

    renderer
        .write_nar(
            &mut buf,
            crate::proto::node::Node::Directory(DirectoryNode {
                name: "doesntmatter".to_string(),
                digest: DIRECTORY_COMPLICATED.digest(),
                size: DIRECTORY_COMPLICATED.size(),
            }),
        )
        .expect("must succeed");

    assert_eq!(
        buf,
        vec![
            13, 0, 0, 0, 0, 0, 0, 0, 110, 105, 120, 45, 97, 114, 99, 104, 105, 118, 101, 45, 49, 0,
            0, 0, // "nix-archive-1"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            9, 0, 0, 0, 0, 0, 0, 0, 100, 105, 114, 101, 99, 116, 111, 114, 121, 0, 0, 0, 0, 0, 0,
            0, // "directory"
            5, 0, 0, 0, 0, 0, 0, 0, 101, 110, 116, 114, 121, 0, 0, 0, // "entry"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 110, 97, 109, 101, 0, 0, 0, 0, // "name"
            5, 0, 0, 0, 0, 0, 0, 0, 46, 107, 101, 101, 112, 0, 0, 0, // ".keep"
            4, 0, 0, 0, 0, 0, 0, 0, 110, 111, 100, 101, 0, 0, 0, 0, // "node"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            7, 0, 0, 0, 0, 0, 0, 0, 114, 101, 103, 117, 108, 97, 114, 0, // "regular"
            8, 0, 0, 0, 0, 0, 0, 0, 99, 111, 110, 116, 101, 110, 116, 115, 0, 0, 0, 0, 0, 0, 0,
            0, // "contents"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            5, 0, 0, 0, 0, 0, 0, 0, 101, 110, 116, 114, 121, 0, 0, 0, // "entry"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 110, 97, 109, 101, 0, 0, 0, 0, // "name"
            2, 0, 0, 0, 0, 0, 0, 0, 97, 97, 0, 0, 0, 0, 0, 0, // "aa"
            4, 0, 0, 0, 0, 0, 0, 0, 110, 111, 100, 101, 0, 0, 0, 0, // "node"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            7, 0, 0, 0, 0, 0, 0, 0, 115, 121, 109, 108, 105, 110, 107, 0, // "symlink"
            6, 0, 0, 0, 0, 0, 0, 0, 116, 97, 114, 103, 101, 116, 0, 0, // "target"
            24, 0, 0, 0, 0, 0, 0, 0, 47, 110, 105, 120, 47, 115, 116, 111, 114, 101, 47, 115, 111,
            109, 101, 119, 104, 101, 114, 101, 101, 108, 115,
            101, //  "/nix/store/somewhereelse"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            5, 0, 0, 0, 0, 0, 0, 0, 101, 110, 116, 114, 121, 0, 0, 0, // "entry"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 110, 97, 109, 101, 0, 0, 0, 0, // "name"
            4, 0, 0, 0, 0, 0, 0, 0, 107, 101, 101, 112, 0, 0, 0, 0, // "keep"
            4, 0, 0, 0, 0, 0, 0, 0, 110, 111, 100, 101, 0, 0, 0, 0, // "node"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            9, 0, 0, 0, 0, 0, 0, 0, 100, 105, 114, 101, 99, 116, 111, 114, 121, 0, 0, 0, 0, 0, 0,
            0, // "directory"
            5, 0, 0, 0, 0, 0, 0, 0, 101, 110, 116, 114, 121, 0, 0, 0, // "entry"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 110, 97, 109, 101, 0, 0, 0, 0, // "name"
            5, 0, 0, 0, 0, 0, 0, 0, 46, 107, 101, 101, 112, 0, 0, 0, // ".keep"
            4, 0, 0, 0, 0, 0, 0, 0, 110, 111, 100, 101, 0, 0, 0, 0, // "node"
            1, 0, 0, 0, 0, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, // "("
            4, 0, 0, 0, 0, 0, 0, 0, 116, 121, 112, 101, 0, 0, 0, 0, // "type"
            7, 0, 0, 0, 0, 0, 0, 0, 114, 101, 103, 117, 108, 97, 114, 0, // "regular"
            8, 0, 0, 0, 0, 0, 0, 0, 99, 111, 110, 116, 101, 110, 116, 115, 0, 0, 0, 0, 0, 0, 0,
            0, // "contents"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, // ")"
            1, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0 // ")"
        ]
    );
}