// Integration tests for compressed archive functionality

use json_archive::archive_open::open_archive;
use json_archive::write_observation;
use json_archive::{read_archive, ReadMode};
use serde_json::{json, Value};
use std::fs::File;
use std::io::{BufWriter, Write};
use tempfile::NamedTempFile;

#[test]
#[cfg(feature = "compression")]
fn test_append_to_compressed_archive_basic() {
    use flate2::write::GzEncoder;
    use flate2::Compression;

    // Create initial archive with one state
    let initial_state = create_json_file(&json!({"count": 0}));
    let archive_file = NamedTempFile::with_suffix(".json.archive").unwrap();

    #[allow(unused_assignments)]
    {
        let file = File::create(archive_file.path()).unwrap();
        let mut writer = BufWriter::new(file);
        let mut current_state = Value::Null;
        let mut observation_count: usize = 0;

        current_state = write_observation(
            &mut writer,
            &mut observation_count,
            None,
            &current_state,
            &initial_state.path().to_path_buf(),
            Some("test".to_string()),
        )
        .unwrap();

        writer.flush().unwrap();
    }

    dump_file(archive_file.path(), "Uncompressed archive");

    // Compress it
    let compressed_file = NamedTempFile::with_suffix(".json.archive.gz").unwrap();
    {
        let input = std::fs::read(archive_file.path()).unwrap();
        let mut encoder = GzEncoder::new(
            compressed_file.as_file().try_clone().unwrap(),
            Compression::default(),
        );
        encoder.write_all(&input).unwrap();
        encoder.finish().unwrap();
    }

    dump_file(compressed_file.path(), "Compressed archive");

    // Verify the compressed archive can be read
    let opened = open_archive(compressed_file.path()).unwrap();
    let result = read_archive(
        opened.reader,
        &compressed_file.path().display().to_string(),
        ReadMode::FullValidation,
    )
    .unwrap();

    eprintln!("=== Reader result ===");
    eprintln!("final_state: {:?}", result.final_state);
    eprintln!("observation_count: {}", result.observation_count);
    eprintln!("diagnostics: {:?}", result.diagnostics);
    eprintln!();

    assert_eq!(result.final_state, json!({"count": 0}));
    assert_eq!(result.observation_count, 0);
}

/// Helper to create a temp file with JSON content
fn create_json_file(content: &Value) -> NamedTempFile {
    let mut file = NamedTempFile::new().expect("Failed to create temp file");
    writeln!(file, "{}", serde_json::to_string(content).unwrap()).unwrap();
    file
}

/// Debug helper: print file contents as both hex and text
fn dump_file(path: &std::path::Path, label: &str) {
    let bytes = std::fs::read(path).unwrap();
    eprintln!("=== {} ({} bytes) ===", label, bytes.len());
    eprintln!("Hex: {:02x?}", &bytes[..bytes.len().min(100)]);
    if let Ok(text) = std::str::from_utf8(&bytes) {
        eprintln!("Text:\n{}", &text[..text.len().min(500)]);
    } else {
        eprintln!("(not valid UTF-8)");
    }
    eprintln!();
}