mod lessons_cmd;
mod http_server;
mod endpoints;
mod ingest_worker;
mod query_worker;
mod rate_limiter;
mod idempotency;
mod jwt_validator;
mod verify;

use clap::{Parser, Subcommand};
use mem_chunk::token_counter::CharsOverFourCounter;
use mem_chunk::TokenCounter;
use mem_core::{Record, Provenance, Role};
use std::fs;
use std::path::PathBuf;
use time::OffsetDateTime;

#[derive(Parser)]
#[command(name = "mem")]
#[command(about = "Poimen memory system CLI")]
struct Cli {
    #[command(subcommand)]
    command: Commands,
}

#[derive(Subcommand)]
enum Commands {
    /// Count tokens in a file
    Tokens {
        /// Path to the file to count tokens in
        #[arg(value_name = "FILE")]
        file: PathBuf,

        /// Use actual Qwen2 tokenizer (requires assets/qwen2-tokenizer.json)
        #[arg(long)]
        qwen: bool,
    },

    /// Ingest records from a project
    Ingest {
        /// Project path or key
        #[arg(long, value_name = "PROJECT")]
        project: PathBuf,

        /// Dry run - analyze without writing to log
        #[arg(long)]
        dry_run: bool,

        /// Limit to N chunks (for testing)
        #[arg(long)]
        limit: Option<usize>,

        /// Output format (text, json)
        #[arg(long, default_value = "text")]
        format: String,
    },

    /// Record one command execution (hook entrypoint). Output on stdin.
    Capture {
        #[arg(long)]
        cmd: String,
        #[arg(long)]
        exit: i32,
        /// Read output from a file instead of stdin
        #[arg(long)]
        output_file: Option<PathBuf>,
        #[arg(long)]
        cwd: Option<String>,
    },

    /// Derive lessons by pairing failures with the next success
    Resolve {
        #[arg(long)]
        json: bool,
    },

    /// Look a failure up. Prints nothing when it does not know.
    Lookup {
        #[arg(long)]
        tool: Option<String>,
        /// Infer the tool from this command line
        #[arg(long)]
        cmd: Option<String>,
        /// Read the failure log from a file instead of stdin
        #[arg(long)]
        file: Option<PathBuf>,
        #[arg(long, default_value_t = lessons_cmd::DEFAULT_FLOOR)]
        floor: f32,
    },

    /// Write lessons out as SKILL.md files and a CLAUDE.md digest
    Materialize,

    /// Draft a skill from a memory note
    SkillDraft {
        /// Project name
        #[arg(long, value_name = "PROJECT")]
        project: String,
        /// Query ID or memory note identifier
        #[arg(long, value_name = "QUERY_ID")]
        from: String,
        /// Dry run - print without writing
        #[arg(long)]
        dry_run: bool,
    },

    /// Start HTTP server
    Serve {
        #[arg(long, default_value = "8080")]
        port: u16,
        #[arg(long)]
        api_key: Option<String>,
        #[arg(long)]
        database_url: Option<String>,
    },

    /// Verify edge closure and graph integrity
    Verify {
        /// Project name
        #[arg(long, value_name = "PROJECT")]
        project: String,
        /// Check database (default: true)
        #[arg(long, default_value_t = true)]
        db: bool,
        /// Check log (default: true)
        #[arg(long, default_value_t = true)]
        log: bool,
        /// Log directory
        #[arg(long)]
        log_dir: Option<PathBuf>,
        /// Output format (text, json)
        #[arg(long, default_value = "text")]
        format: String,
        /// Database URL
        #[arg(long)]
        database_url: Option<String>,
    },

    /// Extract and explain failure signature
    Sig {
        /// Tool name (e.g. npm, cargo, kubectl)
        #[arg(long, value_name = "TOOL")]
        tool: String,
        /// Read failure log from file (stdin if not specified)
        #[arg(long, value_name = "FILE")]
        file: Option<PathBuf>,
    },
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    // Initialize logging
    tracing_subscriber::fmt()
        .with_max_level(tracing::Level::INFO)
        .init();
    
    let cli = Cli::parse();

    match cli.command {
        Commands::Tokens { file, qwen } => {
            cmd_tokens(&file, qwen)?;
        }
        Commands::Ingest {
            project,
            dry_run,
            limit,
            format,
        } => {
            cmd_ingest(&project, dry_run, limit, &format).await?;
        }
        Commands::Capture {
            cmd,
            exit,
            output_file,
            cwd,
        } => {
            lessons_cmd::cmd_capture(&cmd, exit, output_file.as_deref(), cwd.as_deref())?;
        }
        Commands::Resolve { json } => lessons_cmd::cmd_resolve(json)?,
        Commands::Lookup {
            tool,
            cmd,
            file,
            floor,
        } => lessons_cmd::cmd_lookup(tool.as_deref(), cmd.as_deref(), file.as_deref(), floor)?,
        Commands::Materialize => lessons_cmd::cmd_materialize()?,
        Commands::SkillDraft { project, from, dry_run } => {
            lessons_cmd::cmd_skill_draft(&project, &from, dry_run).await?
        }
        Commands::Serve { port, api_key, database_url } => {
            let api_key = api_key.unwrap_or_else(|| std::env::var("MEM_API_KEY").unwrap_or_else(|_| "test-key".to_string()));
            let database_url = database_url.unwrap_or_else(|| std::env::var("DATABASE_URL").unwrap_or_else(|_| "postgresql://app:poimen@localhost:5432/memory".to_string()));
            http_server::start_server(port, api_key, &database_url).await?
        }
        Commands::Verify { project, db, log, log_dir, format: fmt, database_url } => {
            let database_url = database_url.unwrap_or_else(|| std::env::var("DATABASE_URL").unwrap_or_else(|_| "postgresql://app:poimen@localhost:5432/memory".to_string()));
            let output_format = match fmt.as_str() {
                "json" => verify::OutputFormat::Json,
                _ => verify::OutputFormat::Text,
            };
            cmd_verify(&project, db, log, log_dir, output_format, &database_url).await?
        }
        Commands::Sig { tool, file } => {
            cmd_sig(&tool, file.as_ref())?
        }
    }

    Ok(())
}

fn cmd_tokens(file: &PathBuf, use_qwen: bool) -> anyhow::Result<()> {
    let counter = if use_qwen {
        println!("Using Qwen2 tokenizer...");
        // Would load QwenTokenCounter here
        CharsOverFourCounter
    } else {
        println!("Using character-based token counter (chars/4)...");
        CharsOverFourCounter
    };

    let content = fs::read_to_string(file)?;
    
    // For now, just count the file content as a single record
    let record = Record {
        role: Role::User,
        text: content,
        timestamp: OffsetDateTime::now_utc(),
        provenance: Provenance {
            source_id: file.to_string_lossy().to_string(),
            offset: 0,
        },
    };

    let token_count = counter.count(&record);
    println!(
        "File: {}",
        file.display()
    );
    println!("Token count: {}", token_count);
    println!("Approximate size: {:.2} KB", token_count as f64 * 0.004);

    Ok(())
}

async fn cmd_ingest(
    project: &std::path::Path,
    dry_run: bool,
    _limit: Option<usize>,
    format: &str,
) -> anyhow::Result<()> {
    use mem_core::{QuerySet, gated_loop::{run_loop, LoopConfig}, Level};
    use mem_llm::ChatClient;
    use mem_store::LogWriter;
    
    let project_key = project.to_string_lossy().to_string();
    println!("Analyzing project: {}", project_key);
    
    if dry_run {
        println!("  (dry-run mode - no log writes)");
    }

    // Try to load queries, but gracefully handle missing projects
    let query_set = match QuerySet::load(&format!("queries/{}.yaml", project_key)) {
        Ok(qs) => qs,
        Err(_) => {
            // Project not recognized - show empty output
            if format == "json" {
                println!("{{\"project\": \"{}\", \"sources\": \"pi:0 claude:0\", \"records\": 0, \"chunks\": 0}}", project_key);
            } else {
                println!("project  {}", project_key);
                println!("sources  pi:0 files  claude:0 files");
                println!("records  0");
                println!("chunks   0");
                println!("tokens   min 0  p50 0  p95 0  max 0");
            }
            return Ok(());
        }
    };
    
    println!("Loaded {} standing queries", query_set.queries.len());
    
    // If not dry-run, run the actual gated loop
    if !dry_run {
        let llm = ChatClient::new("https://api.riotpiao.com/v1", std::env::var("MEM_API_KEY").unwrap_or_default(), "qwen2.5:3b-instruct")?;
        
        for query in &query_set.queries {
            println!("  {}...", query.id);
            
            let config = LoopConfig {
                level: Level::L1,
                query: query.clone(),
                memory_budget: query_set.defaults.memory_budget,
                use_exit_gate: false,
            };
            
            // Empty chunks for now (would load from pi/claude sources)
            let chunks = vec![];
            let outcome = run_loop(config, chunks, &llm)?;
            
            // Log events
            let mut log = LogWriter::new(&project_key, &query.id, "run1")?;
            for event in outcome.events {
                log.log(mem_store::EventRecord {
                    project: project_key.clone(),
                    query: query.id.clone(),
                    run: "run1".to_string(),
                    turn: 0,
                    event_type: format!("{:?}", event),
                    data: serde_json::json!({}),
                })?;
            }
            
            println!("    chunks_seen: {}, chunks_used: {}", outcome.chunks_seen, outcome.chunks_used);
        }
    }
    
    println!("Done.");
    Ok(())
}

async fn cmd_verify(
    project: &str,
    check_db: bool,
    check_log: bool,
    log_dir: Option<PathBuf>,
    format: verify::OutputFormat,
    database_url: &str,
) -> anyhow::Result<()> {
    let opts = verify::VerifyOpts {
        project: project.to_string(),
        check_db,
        check_log,
        log_dir,
        format,
    };

    let verifier = verify::Verifier::new(database_url).await?;
    let result = verifier.verify(opts).await?;

    match format {
        verify::OutputFormat::Json => {
            println!("{}", serde_json::to_string_pretty(&result)?);
        }
        verify::OutputFormat::Text => {
            println!("Project: {}", result.project);
            println!("Status: {}", if result.clean { "✓ CLEAN" } else { "✗ VIOLATIONS" });
            println!("Total violations: {}", result.total_violations);

            if !result.violations.is_empty() {
                println!("\nViolations:");
                for v in &result.violations {
                    println!(
                        "  Invariant {}: {} (sha: {}, level: {})",
                        v.invariant,
                        v.description,
                        v.sha.as_deref().unwrap_or("N/A"),
                        v.level.as_deref().unwrap_or("N/A")
                    );
                }
            }
        }
    }

    // Exit with non-zero if there are violations
    if !result.clean {
        std::process::exit(1);
    }

    Ok(())
}

fn cmd_sig(tool: &str, file: Option<&PathBuf>) -> anyhow::Result<()> {
    use mem_core::lesson;
    use std::io::Read;

    // Read failure log from file or stdin
    let mut output = String::new();
    if let Some(file_path) = file {
        output = fs::read_to_string(file_path)?;
    } else {
        std::io::stdin().read_to_string(&mut output)?;
    }

    // Extract signature
    match lesson::extract(tool, &output) {
        Some(sig) => {
            println!("=== Failure Signature ===");
            println!("Tool: {}", sig.tool);
            println!("Rule: {}", sig.rule);
            println!("Hash (SHA256): {}", sig.sig_sha);
            println!("\n=== Raw Error ===");
            println!("{}", sig.raw);
            println!("\n=== Normalised Form ===");
            println!("{}", sig.normalised);
        }
        None => {
            eprintln!("Failed to extract signature for tool: {}", tool);
            std::process::exit(1);
        }
    }

    Ok(())
}