/// End-to-end pipeline test: source -> chunker -> records consumed
/// This proves the full system works, not just individual components
use mem_ingest::PiSessionSource;
use mem_chunk::{RecordSource, chunks, ChunkPolicy};
use mem_core::Role;
use futures::stream::StreamExt;
use std::path::PathBuf;

#[tokio::test]
async fn e2e_pi_session_full_pipeline() {
    let fixture = PathBuf::from("fixtures/pi-session-small.jsonl");
    println!("\n=== E2E PIPELINE TEST ===");
    println!("Fixture: {}", fixture.display());
    
    // Step 1: Source reads project key
    println!("\nStep 1: Reading project key from source...");
    let source = PiSessionSource::new(fixture.clone());
    let project = source.read_project_key().await.expect("Failed to read project key");
    println!("✓ Project key: {}", project);
    assert_eq!(project, "/tmp/my-project");
    
    // Step 2: Source streams records
    println!("\nStep 2: Streaming records from source...");
    let source = PiSessionSource::new(fixture.clone());
    let mut records_stream = source.records();
    let mut records = Vec::new();
    let mut user_count = 0;
    let mut assistant_count = 0;
    let mut tool_count = 0;
    let mut system_count = 0;
    
    while let Some(result) = records_stream.next().await {
        match result {
            Ok(record) => {
                match record.role {
                    Role::User => user_count += 1,
                    Role::Assistant => assistant_count += 1,
                    Role::ToolResult => tool_count += 1,
                    Role::System => system_count += 1,
                }
                records.push(record);
            }
            Err(e) => panic!("Error reading record: {}", e),
        }
    }
    
    println!("✓ Records streamed: {}", records.len());
    println!("  - User: {}", user_count);
    println!("  - Assistant: {}", assistant_count);
    println!("  - ToolResult: {}", tool_count);
    println!("  - System: {}", system_count);
    
    assert!(records.len() > 0, "Should have parsed records");
    assert!(user_count > 0, "Should have user messages");
    assert!(assistant_count > 0, "Should have assistant messages");
    
    // Step 3: Chunker processes records
    println!("\nStep 3: Chunking records through policy...");
    let source = PiSessionSource::new(fixture.clone());
    let policy = ChunkPolicy::default();
    let mut chunk_stream = chunks(source, policy);
    
    let mut chunks_vec = Vec::new();
    let mut total_chunk_records = 0;
    let mut min_tokens = usize::MAX;
    let mut max_tokens = 0;
    
    while let Some(result) = chunk_stream.next().await {
        match result {
            Ok(chunk) => {
                let token_count = chunk.tokens;
                total_chunk_records += chunk.records.len();
                min_tokens = min_tokens.min(token_count);
                max_tokens = max_tokens.max(token_count);
                chunks_vec.push(chunk);
            }
            Err(e) => panic!("Error chunking: {}", e),
        }
    }
    
    println!("✓ Chunks produced: {}", chunks_vec.len());
    println!("  - Total records in chunks: {}", total_chunk_records);
    println!("  - Token range: {} to {} (budget: 5000)", min_tokens, max_tokens);
    
    assert!(chunks_vec.len() > 0, "Should produce at least one chunk");
    
    // Step 4: Verify losslessness
    println!("\nStep 4: Verifying losslessness...");
    assert_eq!(records.len(), total_chunk_records, 
        "All records must flow into chunks without loss");
    println!("✓ Lossless: {} records in == {} records out", records.len(), total_chunk_records);
    
    // Step 5: Verify chunk integrity
    println!("\nStep 5: Verifying chunk integrity...");
    for chunk in &chunks_vec {
        assert!(!chunk.records.is_empty(), "Chunk must have records");
        assert!(chunk.t > 0, "Turn index must be positive");
        
        // Verify no record was split
        for record in &chunk.records {
            assert!(!record.text.is_empty(), "Record must have content");
        }
    }
    println!("✓ All chunks have valid turn indices and records");
    
    // Verify turn indices are contiguous
    let mut expected_t = 1u32;
    for chunk in &chunks_vec {
        assert_eq!(chunk.t, expected_t, "Turn indices must be contiguous");
        expected_t += 1;
    }
    println!("✓ Turn indices are contiguous (1..{})", chunks_vec.len());
    
    println!("\n=== E2E PIPELINE SUCCESS ===");
    println!("Project: {}", project);
    println!("Records: {} (user: {}, asst: {}, tool: {}, sys: {})", 
        records.len(), user_count, assistant_count, tool_count, system_count);
    println!("Chunks: {}", chunks_vec.len());
    println!("Lossless: ✓");
    println!("Integrity: ✓");
}

#[tokio::test]
async fn e2e_claude_transcript_full_pipeline() {
    let fixture = PathBuf::from("fixtures/claude-transcript-small.jsonl");
    println!("\n=== E2E CLAUDE PIPELINE TEST ===");
    
    // Same full pipeline but with Claude source
    use mem_ingest::ClaudeTranscriptSource;
    
    let source = ClaudeTranscriptSource::new(fixture.clone());
    let project = source.read_project_key().await.expect("Failed to read project");
    println!("✓ Project: {}", project);
    
    let source = ClaudeTranscriptSource::new(fixture.clone());
    let mut records_stream = source.records();
    let mut record_count = 0;
    
    while let Some(result) = records_stream.next().await {
        if result.is_ok() {
            record_count += 1;
        }
    }
    println!("✓ Records: {}", record_count);
    
    let source = ClaudeTranscriptSource::new(fixture);
    let policy = ChunkPolicy::default();
    let mut chunk_stream = chunks(source, policy);
    let mut chunk_count = 0;
    let mut total = 0;
    
    while let Some(Ok(chunk)) = chunk_stream.next().await {
        chunk_count += 1;
        total += chunk.records.len();
    }
    println!("✓ Chunks: {}", chunk_count);
    
    assert_eq!(record_count, total, "Claude pipeline must also be lossless");
    println!("✓ Lossless: {} == {}", record_count, total);
    println!("\n=== E2E CLAUDE PIPELINE SUCCESS ===");
}