use std::fs;
use std::path::Path;

use wireguard_admin::config::{ResolvedSettings, SettingsFile};
use wireguard_admin::domain::PublicKey;
use wireguard_admin::vault::import::{CandidateStatus, parse_client_config};
use wireguard_admin::vault::source::{
    MAX_CANDIDATE_BYTES, SourceFailureKind, import_configured_directory, prepare_initial_setup,
};
use wireguard_admin::vault::{VaultBundle, WireGuardPrivateKey};
use wireguard_admin::wireguard::ConfigDocument;

fn settings(source: &Path) -> ResolvedSettings {
    let raw = format!(
        r#"
interface_name = "wg0"
server_config_path = "server.conf"
client_source_directory = {:?}
server_endpoint = "vpn.example:51820"
ipv4_allocation_range = "10.8.0.0/24"
ipv6_allocation_range = "fd00::/64"
dns_addresses = ["10.8.0.1"]
systemd_unit = "wg-quick@wg0.service"
restart_timeout_seconds = 30
"#,
        source.display().to_string()
    );
    SettingsFile::parse_toml(&raw)
        .unwrap()
        .validate()
        .unwrap()
        .resolve_paths(Path::new("/synthetic/app"))
}

fn server_and_client() -> (ConfigDocument, WireGuardPrivateKey, PublicKey) {
    let server_key = WireGuardPrivateKey::generate().unwrap();
    let client_key = WireGuardPrivateKey::generate().unwrap();
    let client_public = client_key.public_key();
    let server = ConfigDocument::parse(
        format!(
            "[Interface]\nPrivateKey = {}\nAddress = 10.8.0.1/24\n\n[Peer]\nPublicKey = {}\nAllowedIPs = 10.8.0.2/32\n# admin note\n",
            server_key.to_base64(),
            client_public
        )
        .as_bytes(),
    )
    .unwrap();
    (server, client_key, client_public)
}

fn client_file(client: &WireGuardPrivateKey, server: &ConfigDocument) -> Vec<u8> {
    let server_key = server
        .source_slice(server.sections()[0].span)
        .unwrap()
        .lines()
        .find_map(|line| line.strip_prefix("PrivateKey = "))
        .map(|value| {
            WireGuardPrivateKey::parse_base64(value)
                .unwrap()
                .public_key()
        })
        .unwrap();
    format!(
        "[Interface]\nPrivateKey = {}\nAddress = 10.8.0.2/32\n\n[Peer]\nPublicKey = {}\nEndpoint = vpn.example:51820\nAllowedIPs = 0.0.0.0/0, ::/0\n",
        client.to_base64(), server_key
    )
    .into_bytes()
}

#[test]
fn initial_setup_encrypts_valid_files_and_leaves_sources_and_server_unchanged() {
    let directory = tempfile::tempdir().unwrap();
    let (server, client, identity) = server_and_client();
    let original_server = server.render();
    let source_bytes = client_file(&client, &server);
    fs::write(directory.path().join("laptop.conf"), &source_bytes).unwrap();
    fs::write(
        directory.path().join("broken.conf"),
        b"not a WireGuard file",
    )
    .unwrap();
    fs::write(directory.path().join("ignored.txt"), &source_bytes).unwrap();
    fs::create_dir(directory.path().join("nested")).unwrap();
    fs::write(directory.path().join("nested/server.conf"), &source_bytes).unwrap();

    let prepared =
        prepare_initial_setup(&settings(directory.path()), &server, "setup password").unwrap();
    assert!(prepared.report.scan_complete);
    assert_eq!(prepared.bundle.record_count(), 1);
    let statuses = prepared.report.reconciliation.candidate_summaries();
    assert!(statuses.iter().any(|(_, status)| matches!(
        status,
        CandidateStatus::Matched {
            address_discrepancy: false,
            server_identity: wireguard_admin::vault::import::ServerIdentityComparison::Matches,
            missing_metadata: true,
            invalid_metadata: false,
            unsupported_projection: false,
        }
    )));
    assert!(
        statuses
            .iter()
            .any(|(_, status)| matches!(status, CandidateStatus::Invalid(_)))
    );
    let encoded = prepared.bundle.to_toml().unwrap();
    assert!(!encoded.contains(&client.to_base64()));
    let loaded = VaultBundle::from_toml(&encoded).unwrap();
    assert_eq!(loaded.record_count(), 1);
    assert!(loaded.contains_record(identity));
    assert_eq!(
        loaded
            .retrieve_record(identity, "setup password")
            .unwrap()
            .public_key(),
        identity
    );
    assert!(loaded.retrieve_record(identity, "wrong password").is_err());
    assert!(fs::read(directory.path().join("laptop.conf")).unwrap() == source_bytes);
    assert_eq!(
        fs::read(directory.path().join("broken.conf")).unwrap(),
        b"not a WireGuard file"
    );
    assert!(server.render() == original_server);
}

#[test]
fn symlinks_and_oversized_candidates_are_reported_without_import() {
    let directory = tempfile::tempdir().unwrap();
    let external = tempfile::NamedTempFile::new().unwrap();
    fs::write(external.path(), b"outside source root").unwrap();
    #[cfg(unix)]
    std::os::unix::fs::symlink(external.path(), directory.path().join("linked.conf")).unwrap();
    fs::write(
        directory.path().join("large.conf"),
        vec![b'x'; MAX_CANDIDATE_BYTES + 1],
    )
    .unwrap();
    let (server, _, _) = server_and_client();
    let mut bundle = VaultBundle::create("password").unwrap();
    let report =
        import_configured_directory(&mut bundle, &settings(directory.path()), &server).unwrap();
    assert_eq!(bundle.record_count(), 0);
    assert!(!report.scan_complete);
    assert!(report.issues.iter().any(|issue| {
        issue.kind == SourceFailureKind::FileTooLarge
            && issue.file_name.as_deref() == Some("large.conf")
    }));
    #[cfg(unix)]
    assert!(report.issues.iter().any(|issue| {
        issue.kind == SourceFailureKind::FileUnavailable
            && issue.file_name.as_deref() == Some("linked.conf")
    }));
}

#[test]
fn enumeration_failure_is_visible_and_does_not_claim_a_complete_scan() {
    let absent = tempfile::tempdir().unwrap().path().join("missing");
    let (server, _, _) = server_and_client();
    let mut bundle = VaultBundle::create("password").unwrap();
    let report = import_configured_directory(&mut bundle, &settings(&absent), &server).unwrap();
    assert!(!report.scan_complete);
    assert_eq!(
        report.issues[0].kind,
        SourceFailureKind::DirectoryUnavailable
    );
    assert_eq!(bundle.record_count(), 0);
}

#[test]
fn candidate_count_limit_marks_the_scan_incomplete() {
    let directory = tempfile::tempdir().unwrap();
    for index in 0..=wireguard_admin::vault::source::MAX_CANDIDATES {
        fs::write(
            directory.path().join(format!("candidate-{index}.conf")),
            b"bad",
        )
        .unwrap();
    }
    let (server, _, _) = server_and_client();
    let mut bundle = VaultBundle::create("password").unwrap();
    let report =
        import_configured_directory(&mut bundle, &settings(directory.path()), &server).unwrap();
    assert!(!report.scan_complete);
    assert!(
        report
            .issues
            .iter()
            .any(|issue| issue.kind == SourceFailureKind::TooManyEntries)
    );
    assert_eq!(bundle.record_count(), 0);
}

#[test]
fn explicit_import_uses_existing_identity_and_rejects_duplicate_without_replacement() {
    let directory = tempfile::tempdir().unwrap();
    let (server, client, identity) = server_and_client();
    let initial_source = tempfile::tempdir().unwrap();
    let initial =
        prepare_initial_setup(&settings(initial_source.path()), &server, "password").unwrap();
    let original_recipient = initial.bundle.recipient().to_owned();
    let mut bundle = initial.bundle;
    fs::write(
        directory.path().join("client.conf"),
        client_file(&client, &server),
    )
    .unwrap();
    let report =
        import_configured_directory(&mut bundle, &settings(directory.path()), &server).unwrap();
    assert_eq!(bundle.recipient(), original_recipient);
    assert_eq!(bundle.record_count(), 1);
    assert!(
        report
            .reconciliation
            .candidate_summaries()
            .iter()
            .any(|(_, status)| matches!(status, CandidateStatus::Matched { .. }))
    );
    let before_repeat = bundle.to_toml().unwrap();
    let repeated =
        import_configured_directory(&mut bundle, &settings(directory.path()), &server).unwrap();
    assert_eq!(bundle.to_toml().unwrap(), before_repeat);
    assert_eq!(bundle.record_count(), 1);
    assert!(
        repeated
            .issues
            .iter()
            .any(|issue| issue.kind == SourceFailureKind::DuplicateRecordEqualityUnverified)
    );
    let result = bundle.retrieve_record(identity, "password").unwrap();
    assert_eq!(result.public_key(), identity);
    assert!(parse_client_config(&client_file(&client, &server)).is_ok());
}