// cli/node.rs — node subcommand handlers
//
// render, write, node-delete, node-rename, history, list-keys,
// list-edges, dump-json, lookup-bump, lookups.

use anyhow::{bail, Context, Result};
use crate::hippocampus as memory;

pub async fn cmd_weight_set(key: &str, weight: f32) -> Result<()> {
    super::check_dry_run();
    let result = memory::memory_weight_set(None, key, weight).await?;
    println!("{}", result);
    Ok(())
}

pub async fn cmd_node_delete(key: &[String]) -> Result<()> {
    if key.is_empty() {
        bail!("node-delete requires a key");
    }
    super::check_dry_run();
    let key = key.join(" ");
    let result = memory::memory_delete(None, &key).await?;
    println!("{}", result);
    Ok(())
}

pub async fn cmd_node_rename(old_key: &str, new_key: &str) -> Result<()> {
    super::check_dry_run();
    let result = memory::memory_rename(None, old_key, new_key).await?;
    println!("{}", result);
    Ok(())
}

pub async fn cmd_node_restore(key: &[String]) -> Result<()> {
    if key.is_empty() {
        bail!("node-restore requires a key");
    }
    super::check_dry_run();
    let key = key.join(" ");
    let result = memory::memory_restore(None, &key).await?;
    println!("{}", result);
    Ok(())
}

pub async fn cmd_render(key: &[String]) -> Result<()> {
    if key.is_empty() {
        bail!("render requires a key");
    }
    let key = key.join(" ");

    let rendered = memory::memory_render(None, &key, None).await?;
    print!("{}", rendered);

    // Mark as seen if we're inside a Claude session (not an agent subprocess —
    // agents read the seen set but shouldn't write to it as a side effect of
    // tool calls; only surface_agent_cycle should mark keys seen)
    if std::env::var("POC_AGENT").is_err()
        && let Ok(session_id) = std::env::var("POC_SESSION_ID")
        && !session_id.is_empty()
    {
        let state_dir = crate::store::memory_dir().join("sessions");
        let seen_path = state_dir.join(format!("seen-{}", session_id));
        if let Ok(mut f) = std::fs::OpenOptions::new()
            .create(true).append(true).open(seen_path)
        {
            use std::io::Write;
            let ts = chrono::Local::now().format("%Y-%m-%dT%H:%M:%S");
            let _ = writeln!(f, "{}\t{}", ts, key);
        }
    }

    Ok(())
}

pub async fn cmd_history(key: &[String], full: bool) -> Result<()> {
    if key.is_empty() {
        bail!("history requires a key");
    }
    let key = key.join(" ");
    let result = memory::memory_history(None, &key, Some(full)).await?;
    print!("{}", result);
    Ok(())
}

pub async fn cmd_write(key: &[String]) -> Result<()> {
    if key.is_empty() {
        bail!("write requires a key (reads content from stdin)");
    }
    let key = key.join(" ");
    let mut content = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut content)
        .context("read stdin")?;

    if content.trim().is_empty() {
        bail!("No content on stdin");
    }
    super::check_dry_run();

    let result = memory::memory_write(None, &key, &content).await?;
    println!("{}", result);
    Ok(())
}

pub async fn cmd_edit(key: &[String]) -> Result<()> {
    if key.is_empty() {
        bail!("edit requires a key");
    }
    let key = key.join(" ");

    // Get raw content
    let content = memory::memory_render(None, &key, Some(true)).await
        .unwrap_or_default();

    let tmp = std::env::temp_dir().join(format!("poc-memory-edit-{}.md", key.replace('/', "_")));
    std::fs::write(&tmp, &content)
        .with_context(|| format!("write temp file {}", tmp.display()))?;

    let editor = std::env::var("EDITOR").unwrap_or_else(|_| "vi".into());
    let status = std::process::Command::new(&editor)
        .arg(&tmp)
        .status()
        .with_context(|| format!("spawn {}", editor))?;

    if !status.success() {
        let _ = std::fs::remove_file(&tmp);
        bail!("{} exited with {}", editor, status);
    }

    let new_content = std::fs::read_to_string(&tmp)
        .with_context(|| format!("read temp file {}", tmp.display()))?;
    let _ = std::fs::remove_file(&tmp);

    if new_content == content {
        println!("No change: '{}'", key);
        return Ok(());
    }

    if new_content.trim().is_empty() {
        bail!("Content is empty, aborting");
    }

    super::check_dry_run();
    let result = memory::memory_write(None, &key, &new_content).await?;
    println!("{}", result);
    Ok(())
}

pub async fn cmd_search(keys: &[String]) -> Result<()> {
    if keys.is_empty() {
        bail!("search requires seed keys");
    }
    let result = memory::memory_search(None, keys.to_vec(), None, None, None, None).await?;
    print!("{}", result);
    Ok(())
}

pub async fn cmd_query(expr: &[String]) -> Result<()> {
    if expr.is_empty() {
        bail!("query requires an expression (try: poc-memory query --help)");
    }

    let query_str = expr.join(" ");
    let result = memory::memory_query(None, &query_str, None).await?;
    print!("{}", result);
    Ok(())
}

/// Load content for a list of node keys.
async fn load_nodes(keys: &[String]) -> Vec<(String, String)> {
    let mut results = Vec::new();
    for key in keys {
        if let Ok(content) = memory::memory_render(None, key, Some(true)).await {
            if !content.trim().is_empty() {
                results.push((key.clone(), content.trim().to_string()));
            }
        }
    }
    results
}

pub async fn cmd_load_context(stats: bool) -> Result<()> {
    let cfg = crate::config::get();

    let personality = load_nodes(&cfg.personality_nodes).await;
    let agent = load_nodes(&cfg.agent_nodes).await;

    if stats {
        let p_words: usize = personality.iter().map(|(_, c)| c.split_whitespace().count()).sum();
        let a_words: usize = agent.iter().map(|(_, c)| c.split_whitespace().count()).sum();

        println!("{:<25} {:>6} {:>8}", "GROUP", "ITEMS", "WORDS");
        println!("{}", "-".repeat(42));
        println!("{:<25} {:>6} {:>8}", "personality_nodes", personality.len(), p_words);
        println!("{:<25} {:>6} {:>8}", "agent_nodes", agent.len(), a_words);
        println!("{}", "-".repeat(42));
        println!("{:<25} {:>6} {:>8}", "TOTAL", personality.len() + agent.len(), p_words + a_words);
        return Ok(());
    }

    println!("=== MEMORY SYSTEM ({}) ===", crate::config::app().assistant_name);

    if !personality.is_empty() {
        println!("--- personality_nodes ({}) ---", personality.len());
        for (key, content) in personality {
            println!("## {}", key);
            println!("{}\n", content);
        }
    }

    if !agent.is_empty() {
        println!("--- agent_nodes ({}) ---", agent.len());
        for (key, content) in agent {
            println!("## {}", key);
            println!("{}\n", content);
        }
    }

    println!("=== END MEMORY LOAD ===");
    Ok(())
}