//! status: detailed state of one agent, or of every installed agent.

use super::*;
use crate::output::{boxed_table, kv_table, print_json, status_style};
use crate::probe::ExternalInfo;
use crate::state::InstalledEntry;
use serde::Serialize;

#[derive(Serialize)]
struct StatusDetail {
    name: String,
    display_name: String,
    status: String,
    version: Option<String>,
    method: Option<String>,
    path: Option<String>,
    run: Option<String>,
    pid: Option<u32>,
    started_at: Option<String>,
    installed_at: Option<String>,
    log: Option<String>,
    managed: bool,
}

pub fn run(app: &App, agent_name: Option<&str>) -> Result<i32> {
    let probe = crate::probe::detect_externals(app);
    match agent_name {
        Some(name) => status_one(app, name, &probe),
        None => status_all(app, &probe),
    }
}

fn status_one(app: &App, name: &str, probe: &ExternalInfo) -> Result<i32> {
    let agent = require_agent(app, name)?;
    let entry: Option<InstalledEntry> = app.state.get(&agent.name).ok().flatten();
    let detail = detail_for(app, agent, entry.as_ref(), probe);
    if app.json() {
        print_json(&detail);
        return Ok(0);
    }
    let color = app.color();
    let theme = app.theme();
    // Favorite star (issue #39).
    let star = if crate::commands::annotations_cmd::is_favorite(app, &agent.name) {
        "★ "
    } else {
        ""
    };
    println!("{}{} ({})", star, agent.title(), agent.name);
    let status_line = status_style(&detail.status, theme, color);
    let mut rows: Vec<(String, String)> = vec![
        ("agent".to_string(), agent.name.clone()),
        ("status".to_string(), status_line),
        (
            "version".to_string(),
            detail.version.clone().unwrap_or_else(|| "unknown".to_string()),
        ),
        (
            "method".to_string(),
            detail.method.clone().unwrap_or_else(|| "—".to_string()),
        ),
        (
            "path".to_string(),
            detail.path.clone().unwrap_or_else(|| "—".to_string()),
        ),
        (
            "run".to_string(),
            detail.run.clone().unwrap_or_else(|| "—".to_string()),
        ),
    ];
    if let Some(pid) = detail.pid {
        rows.push(("pid".to_string(), pid.to_string()));
    }
    if let Some(t) = &detail.started_at {
        rows.push(("started".to_string(), t.clone()));
    }
    if let Some(t) = &detail.installed_at {
        rows.push(("installed".to_string(), t.clone()));
    }
    if let Some(l) = &detail.log {
        rows.push(("log".to_string(), l.clone()));
    }
    print!("{}", kv_table(&rows, theme, color));
    Ok(0)
}

fn status_all(app: &App, probe: &ExternalInfo) -> Result<i32> {
    let entries = app.state.all().unwrap_or_default();
    let mut rows: Vec<AgentRow> = Vec::new();
    for agent in app.catalog.agents() {
        if agent.hidden {
            continue;
        }
        let entry = entries.get(&agent.name);
        let d = detail_for(app, agent, entry, probe);
        if d.status == "running" || d.status == "installed" || d.status == "external" {
            rows.push(AgentRow {
                name: agent.name.clone(),
                display_name: agent.title().to_string(),
                status: d.status,
                version: d.version,
                pid: d.pid,
                path: d.path,
            });
        }
    }
    rows.sort_by(|a, b| a.name.cmp(&b.name));
    if app.json() {
        print_json(&rows);
        return Ok(0);
    }
    let color = app.color();
    let theme = app.theme();
    let mut table_rows = Vec::new();
    for r in &rows {
        let star = if crate::commands::annotations_cmd::is_favorite(app, &r.name) {
            "★ "
        } else {
            ""
        };
        table_rows.push(vec![
            format!("{star}{}", r.display_name),
            r.version.clone().unwrap_or_else(|| "—".to_string()),
            status_style(&r.status, theme, color),
            r.pid.map(|p| p.to_string()).unwrap_or_else(|| "—".to_string()),
            r.path.clone().unwrap_or_else(|| "—".to_string()),
        ]);
    }
    print!(
        "{}",
        boxed_table(
            vec!["NAME", "VERSION", "STATUS", "PID", "PATH"],
            table_rows,
            theme,
            color,
        )
    );
    if rows.is_empty() {
        app.log.info("no installed or running agents");
    }
    Ok(0)
}

#[derive(Serialize)]
struct AgentRow {
    name: String,
    display_name: String,
    status: String,
    version: Option<String>,
    pid: Option<u32>,
    path: Option<String>,
}

fn detail_for(
    app: &App,
    agent: &AgentDef,
    entry: Option<&InstalledEntry>,
    probe: &ExternalInfo,
) -> StatusDetail {
    match entry {
        Some(e) => {
            let running = e.pid.map(crate::process::is_running).unwrap_or(false);
            let status = if running { "running" } else { "installed" };
            let path = e
                .bins
                .first()
                .filter(|b| std::path::Path::new(b).exists())
                .cloned()
                .or_else(|| Some(e.install_dir.clone()));
            StatusDetail {
                name: agent.name.clone(),
                display_name: agent.title().to_string(),
                status: status.to_string(),
                version: e.version.clone(),
                method: Some(e.method.clone()),
                path,
                run: Some(e.run.clone()),
                pid: if running { e.pid } else { None },
                started_at: if running { e.started_at.clone() } else { None },
                installed_at: Some(e.installed_at.clone()),
                log: Some(crate::process::agent_log_path(app, &agent.name).display().to_string()),
                managed: true,
            }
        }
        None => {
            let external = probe.path_of(&agent.name).cloned();
            let version = external
                .as_ref()
                .and_then(|_p| probe.version_of(&agent.name).cloned().flatten())
                .or_else(|| agent.version.clone());
            StatusDetail {
                name: agent.name.clone(),
                display_name: agent.title().to_string(),
                status: if external.is_some() {
                    "external".to_string()
                } else if agent.installable {
                    "not-installed".to_string()
                } else {
                    "not-installable".to_string()
                },
                version,
                method: None,
                path: external.map(|p| p.display().to_string()),
                run: agent.run.clone(),
                pid: None,
                started_at: None,
                installed_at: None,
                log: None,
                managed: false,
            }
        }
    }
}