//! The `spectra` command line (spec §19). Output follows `oxy`: colour and
//! glyphs on a UTF-8 terminal, plain when piped, with `--plain` or with
//! `NO_COLOR`; `--json` prints one document on stdout and nothing else.

pub mod admin;
pub mod agent;
pub mod format;
pub mod human;
pub mod identity;
pub mod json;
pub mod marks;
pub mod mcp;
pub mod open;
pub mod project;
pub mod serve;
pub mod ui;

use anyhow::{bail, Result};
use clap::{Parser, Subcommand};
use std::path::PathBuf;

#[derive(Parser)]
#[command(name = "spectra", version = env!("SPECTRA_VERSION_LONG"), about = "A control plane for AI coding agents")]
pub struct Cli {
    /// Plain output: no colour or glyphs (also NO_COLOR, or when not a terminal)
    #[arg(long, global = true)]
    pub plain: bool,
    /// The data directory (default: $XDG_DATA_HOME/spectra, else ~/.local/share/spectra)
    #[arg(long, global = true, env = "SPECTRA_DATA")]
    pub data: Option<PathBuf>,
    #[command(subcommand)]
    pub command: Command,
}

#[derive(Subcommand)]
pub enum Command {
    /// The version and build of this binary
    Version {
        /// Machine-readable output
        #[arg(long)]
        json: bool,
    },
    /// Make this machine's Spectra: record the owner's identity (read from
    /// their OXY_HOME and proven by signing) and make the instance key
    Init {
        /// The owner's OXY_HOME (default: $OXY_HOME, else ~/.config/oxy)
        #[arg(long)]
        owner_home: Option<PathBuf>,
        /// This instance's name (default: the host name)
        #[arg(long)]
        name: Option<String>,
    },
    /// The owner's and the instance's identities: show, refresh
    Identity {
        #[command(subcommand)]
        command: IdentityCmd,
    },
    /// Run the daemon: the ledger, Tuner on the Unix socket and a loopback port
    Serve {
        /// The loopback address and port for browsers and HTTP clients
        #[arg(long, default_value = "127.0.0.1:7350")]
        bind: String,
        /// Allow a non-loopback address in plain HTTP
        #[arg(long)]
        insecure: bool,
        /// Open Radar in the browser once serving (signs a link as the owner)
        #[arg(long)]
        open: bool,
    },
    /// Sign in to Radar: a one-time link signed with the owner's key
    Open {
        #[arg(long)]
        owner_home: Option<PathBuf>,
        /// Print the link without opening a browser
        #[arg(long)]
        no_browser: bool,
    },
    /// The stdio MCP server for one agent: signs with its key and forwards to the daemon
    Mcp {
        /// The agent it speaks for
        #[arg(long)]
        agent: String,
        /// The agent's home (default: the one recorded when it was added)
        #[arg(long)]
        home: Option<PathBuf>,
    },
    /// Post a message as yourself
    Say {
        /// What to say (Markdown; @name mentions)
        body: String,
        /// The channel (default: #general)
        #[arg(short, long)]
        channel: Option<String>,
        /// Reply in the thread of this message
        #[arg(long)]
        reply_to: Option<String>,
        #[arg(long)]
        json: bool,
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
    /// Your unread mentions and direct messages; --follow waits for more
    Inbox {
        #[arg(long)]
        follow: bool,
        #[arg(long)]
        json: bool,
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
    /// Search what was said: words, "phrases", prefix*, AND/OR/NOT
    Search {
        query: String,
        #[arg(long)]
        channel: Option<String>,
        #[arg(long)]
        author: Option<String>,
        /// 7d, 3h, 30m
        #[arg(long)]
        since: Option<String>,
        #[arg(long, default_value_t = 20)]
        limit: u32,
        #[arg(long)]
        json: bool,
    },
    /// Any API call, signed as the owner: JSON out
    Api {
        method: String,
        path: String,
        /// The request body (JSON)
        #[arg(short = 'd', long = "body")]
        body: Option<String>,
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
    /// The checkouts agents work in: add, list
    Project {
        #[command(subcommand)]
        command: ProjectCmd,
    },
    /// Agents, each its owner's delegate: add, list, disable
    Agent {
        #[command(subcommand)]
        command: AgentCmd,
    },
    /// The ledger's own checks: verify, check, rebuild
    Admin {
        #[command(subcommand)]
        command: Admin,
    },
}

#[derive(Subcommand)]
pub enum IdentityCmd {
    /// The owner and the instance as the ledger knows them
    Show {
        #[arg(long)]
        json: bool,
    },
    /// Record the owner's current identity after `oxy identity delegate add|remove`
    Refresh {
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
}

#[derive(Subcommand)]
pub enum ProjectCmd {
    /// Register a checkout: its repository id, remote and pinned subrepos
    Add {
        path: PathBuf,
        /// Its name (default: the directory's)
        #[arg(long)]
        name: Option<String>,
        /// Its remote URL (default: the checkout's origin)
        #[arg(long)]
        remote: Option<String>,
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
    /// Every project with what it pins, what pins it, and its agents
    List {
        #[arg(long)]
        json: bool,
    },
}

#[derive(Subcommand)]
pub enum AgentCmd {
    /// Make an agent's key in its own home and record it once you delegate to it
    Add {
        /// Lower-case letters, digits and dashes
        name: String,
        /// claude-code, antigravity, kimi-code, codex or other
        #[arg(long)]
        kind: String,
        /// The project it works in
        #[arg(long)]
        project: String,
        /// The agent's own OXY_HOME, where its key is made and kept
        #[arg(long)]
        home: PathBuf,
        /// Bind the key to this Unix user: a request from another is refused
        #[arg(long)]
        uid: Option<u32>,
        /// Bind the key to the Unix user of its first signed connection
        #[arg(long, conflicts_with = "uid")]
        learn_uid: bool,
        /// How long to wait for your delegation, in seconds
        #[arg(long, default_value_t = 600)]
        wait: u64,
        /// The owner's OXY_HOME
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
    /// Every agent with its owner, key, delegation and state
    List {
        #[arg(long)]
        json: bool,
    },
    /// Refuse an agent's key from now on
    Disable {
        name: String,
        #[arg(long)]
        owner_home: Option<PathBuf>,
    },
}

#[derive(Subcommand)]
pub enum Admin {
    /// Recompute the hash chain and check every checkpoint and proof (exit 1 on any finding)
    Verify {
        /// Machine-readable output
        #[arg(long)]
        json: bool,
    },
    /// Whether the projections equal a rebuild from the ledger
    Check,
    /// Replay the ledger into every projection
    Rebuild,
}

/// What every command needs: where the data lives.
pub struct Ctx {
    pub data: PathBuf,
}

impl Ctx {
    /// The ledger's database, which must exist.
    pub fn db(&self) -> Result<PathBuf> {
        let db = self.data.join("spectra.db");
        if !db.exists() {
            bail!("no Spectra in {} (run `spectra init`, or pass --data)", self.data.display());
        }
        Ok(db)
    }

    /// The ledger, for writing: the instance key signs its checkpoints, and
    /// the lock keeps any other writer out.
    pub async fn writer(&self) -> Result<spectra_core::ledger::Ledger> {
        let db = self.db()?;
        let instance = spectra_core::keys::KeyPair::instance(&self.data, "spectra")?;
        spectra_core::ledger::Ledger::open(&db, Some(instance)).await
    }

    /// The daemon's Unix socket.
    pub fn socket(&self) -> PathBuf {
        self.data.join("spectra.sock")
    }

    /// Somewhere to append the owner's signed events: straight to the
    /// ledger, or through the daemon when it is serving (spec §8.5).
    pub async fn owner_writer(&self, owner_home: &std::path::Path) -> Result<Writer> {
        let db = self.db()?;
        if spectra_mcp::client::Client::alive(&self.socket()).await {
            let ledger = spectra_core::ledger::Ledger::open_read_only(&db).await?;
            let transport = identity::recorded_owner(&ledger, owner_home).await?;
            return Ok(Writer::Daemon { ledger, client: Box::new(spectra_mcp::client::Client::new(&self.socket(), Some(transport))) });
        }
        Ok(Writer::Direct(self.writer().await?))
    }

    /// `[owner] home` from spectra.toml.
    pub fn config_owner_home(&self) -> Option<PathBuf> {
        let text = std::fs::read_to_string(self.data.join("spectra.toml")).ok()?;
        let t: toml::Table = text.parse().ok()?;
        t.get("owner")?.get("home")?.as_str().map(PathBuf::from)
    }
}

/// Where the owner's events go.
pub enum Writer {
    Direct(spectra_core::ledger::Ledger),
    Daemon { ledger: spectra_core::ledger::Ledger, client: Box<spectra_mcp::client::Client> },
}

impl Writer {
    /// The ledger, for reading.
    pub fn ledger(&self) -> &spectra_core::ledger::Ledger {
        match self {
            Writer::Direct(l) | Writer::Daemon { ledger: l, .. } => l,
        }
    }

    /// Append events signed over their payload, then checkpoint.
    pub async fn append(&self, events: Vec<spectra_core::event::NewEvent>) -> Result<()> {
        match self {
            Writer::Direct(l) => {
                l.append(events).await?;
                l.checkpoint().await?;
            }
            Writer::Daemon { client, .. } => {
                let wire: Vec<_> = events.iter().map(spectra_core::daemon::WireEvent::from_new).collect();
                let r = client.send("POST", "/api/v1/ledger/events", &[], serde_json::to_vec(&wire)?).await?;
                if r.status != 200 {
                    let why = r
                        .json()
                        .ok()
                        .and_then(|v| v.get("title").and_then(|t| t.as_str()).map(String::from))
                        .unwrap_or_else(|| String::from_utf8_lossy(&r.body).into());
                    bail!("the daemon refused: {why}");
                }
            }
        }
        Ok(())
    }
}

fn init_logging() {
    let filter = tracing_subscriber::EnvFilter::try_from_env("SPECTRA_LOG").unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("warn"));
    tracing_subscriber::fmt().with_env_filter(filter).with_writer(std::io::stderr).init();
}

fn default_data() -> PathBuf {
    if let Ok(x) = std::env::var("XDG_DATA_HOME") {
        return PathBuf::from(x).join("spectra");
    }
    let home = std::env::var("HOME").unwrap_or_else(|_| ".".into());
    PathBuf::from(home).join(".local").join("share").join("spectra")
}

fn runtime() -> Result<tokio::runtime::Runtime> {
    Ok(tokio::runtime::Builder::new_multi_thread().enable_all().build()?)
}

pub fn run() -> Result<i32> {
    let cli = Cli::parse();
    ui::init(cli.plain);
    let ctx = Ctx { data: cli.data.unwrap_or_else(default_data) };
    match cli.command {
        Command::Version { json } => version(json),
        Command::Init { owner_home, name } => runtime()?.block_on(identity::init(&ctx, owner_home, name)),
        Command::Identity { command } => runtime()?.block_on(async {
            match command {
                IdentityCmd::Show { json } => identity::show(&ctx, json).await,
                IdentityCmd::Refresh { owner_home } => identity::refresh(&ctx, owner_home).await,
            }
        }),
        Command::Serve { bind, insecure, open } => {
            init_logging();
            runtime()?.block_on(serve::serve(&ctx, &bind, insecure, open))
        }
        Command::Open { owner_home, no_browser } => runtime()?.block_on(open::open(&ctx, owner_home, !no_browser)),
        Command::Mcp { agent, home } => runtime()?.block_on(mcp::run(&ctx, &agent, home)),
        Command::Say { body, channel, reply_to, json, owner_home } => {
            runtime()?.block_on(human::say(&ctx, channel, reply_to, body, owner_home, json))
        }
        Command::Inbox { follow, json, owner_home } => runtime()?.block_on(human::inbox(&ctx, follow, owner_home, json)),
        Command::Search { query, channel, author, since, limit, json } => {
            runtime()?.block_on(human::search(&ctx, &query, channel, author, since, limit, json))
        }
        Command::Api { method, path, body, owner_home } => runtime()?.block_on(human::raw(&ctx, &method, &path, body, owner_home)),
        Command::Project { command } => runtime()?.block_on(async {
            match command {
                ProjectCmd::Add { path, name, remote, owner_home } => project::add(&ctx, &path, name, remote, owner_home).await,
                ProjectCmd::List { json } => project::list(&ctx, json).await,
            }
        }),
        Command::Agent { command } => runtime()?.block_on(async {
            match command {
                AgentCmd::Add { name, kind, project, home, uid, learn_uid, wait, owner_home } => {
                    agent::add(&ctx, agent::Add { name, kind, project, home, uid, learn_uid, wait_secs: wait, owner_home }).await
                }
                AgentCmd::List { json } => agent::list(&ctx, json).await,
                AgentCmd::Disable { name, owner_home } => agent::disable(&ctx, &name, owner_home).await,
            }
        }),
        Command::Admin { command } => runtime()?.block_on(async {
            match command {
                Admin::Verify { json } => admin::verify(&ctx, json).await,
                Admin::Check => admin::check(&ctx).await,
                Admin::Rebuild => admin::rebuild(&ctx).await,
            }
        }),
    }
}

fn version(as_json: bool) -> Result<i32> {
    if as_json {
        println!(
            "{}",
            serde_json::json!({
                "version": env!("CARGO_PKG_VERSION"),
                "build": env!("SPECTRA_BUILD_ID"),
                "mcp_protocol_versions": spectra_mcp::PROTOCOL_VERSIONS,
                "ledger_format": spectra_core::LEDGER_FORMAT,
            })
        );
    } else {
        println!("spectra {}", env!("SPECTRA_VERSION_LONG"));
    }
    Ok(0)
}