//! Wire types shared between `hive-c0re` and the in-container harness.

use serde::{Deserialize, Serialize};

// -----------------------------------------------------------------------------
// Host admin socket — /run/hyperhive/host.sock
// -----------------------------------------------------------------------------

/// Requests on the host admin socket.
///
/// Wire format: one JSON object per line.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "cmd", rename_all = "snake_case")]
pub enum HostRequest {
    /// Create and start a sub-agent container directly (no approval). Use
    /// this from privileged contexts (operator on the host); it bypasses the
    /// approval queue intentionally so test scripts and one-off recoveries
    /// don't need a separate approve step.
    Spawn { name: String },
    /// Submit a spawn request for the user to approve. On approval the host
    /// creates and starts the container. Mirrors the manager's
    /// `RequestSpawn` — exposed on the admin socket so the dashboard and CLI
    /// can also queue spawns through the approval flow.
    RequestSpawn { name: String },
    /// Stop a managed container (graceful).
    Kill { name: String },
    /// Tear down a sub-agent container: stop + remove + drop the systemd
    /// drop-in, purge pending approvals. Persistent state (proposed/applied
    /// repos, Claude credentials) is KEPT by default — recreating the agent
    /// with the same name reuses prior config + login. With `purge=true`
    /// the agent's `/var/lib/hyperhive/{agents,applied}/<name>/` trees are
    /// also wiped (config history + creds + notes gone forever). Manager
    /// not destroyable.
    Destroy {
        name: String,
        #[serde(default)]
        purge: bool,
    },
    /// Apply pending config to a managed container.
    Rebuild { name: String },
    /// List managed containers.
    List,
    /// List pending approval requests.
    Pending,
    /// Approve a pending request by id; the action runs immediately.
    Approve { id: i64 },
    /// Deny a pending request by id.
    Deny { id: i64 },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HostResponse {
    pub ok: bool,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub error: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub agents: Option<Vec<String>>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub approvals: Option<Vec<Approval>>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Approval {
    pub id: i64,
    pub agent: String,
    #[serde(default)]
    pub kind: ApprovalKind,
    /// For `ApplyCommit`: the git sha to apply. For `Spawn`: empty.
    pub commit_ref: String,
    pub requested_at: i64,
    pub status: ApprovalStatus,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub resolved_at: Option<i64>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub note: Option<String>,
}

/// What action the approval, when granted, will trigger.
#[derive(Debug, Clone, Copy, Default, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum ApprovalKind {
    /// Apply a manager-proposed config commit (existing flow).
    #[default]
    ApplyCommit,
    /// Create + start a new sub-agent container with the given name.
    Spawn,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum ApprovalStatus {
    Pending,
    Approved,
    Denied,
    Failed,
}

impl HostResponse {
    pub fn success() -> Self {
        Self {
            ok: true,
            error: None,
            agents: None,
            approvals: None,
        }
    }

    pub fn error(message: impl Into<String>) -> Self {
        Self {
            ok: false,
            error: Some(message.into()),
            agents: None,
            approvals: None,
        }
    }

    pub fn list(agents: Vec<String>) -> Self {
        Self {
            ok: true,
            error: None,
            agents: Some(agents),
            approvals: None,
        }
    }

    pub fn pending(approvals: Vec<Approval>) -> Self {
        Self {
            ok: true,
            error: None,
            agents: None,
            approvals: Some(approvals),
        }
    }
}

// -----------------------------------------------------------------------------
// Per-agent socket — /run/hyperhive/agents/<name>/mcp.sock on the host,
// bind-mounted into the container at /run/hive/mcp.sock.
// -----------------------------------------------------------------------------

/// A logical message between agents.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Message {
    pub from: String,
    pub to: String,
    pub body: String,
}

/// Requests on a per-agent socket. The agent's identity is the socket
/// it came in on; `Send.from` is filled in by the server, not the client.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "cmd", rename_all = "snake_case")]
pub enum AgentRequest {
    /// Send a message to another agent.
    Send { to: String, body: String },
    /// Pop one pending message from this agent's inbox.
    Recv,
    /// Non-mutating: how many pending messages are addressed to me?
    /// Used by the harness to render a status line after each tool call.
    Status,
    /// Operator-injected message TO this agent (from this agent's own web
    /// UI). Recipient is implicit — `from` is `"operator"`. Effectively the
    /// per-agent equivalent of the old dashboard T4LK form, but scoped to
    /// the agent whose page the operator is on.
    OperatorMsg { body: String },
}

/// Responses on a per-agent socket.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "kind", rename_all = "snake_case")]
pub enum AgentResponse {
    /// `Send` succeeded.
    Ok,
    /// Either `Send` failed or `Recv` errored.
    Err { message: String },
    /// `Recv` produced a message.
    Message { from: String, body: String },
    /// `Recv` found nothing pending.
    Empty,
    /// `Status` result: how many pending messages are in this agent's inbox.
    Status { unread: u64 },
}

// -----------------------------------------------------------------------------
// Manager socket — /run/hyperhive/manager/mcp.sock on the host, bind-mounted
// into the manager container at /run/hive/mcp.sock.
// -----------------------------------------------------------------------------

/// Logical name the broker uses for the manager.
pub const MANAGER_AGENT: &str = "manager";

/// Logical name the broker uses for the human operator. Messages with
/// `to = OPERATOR_RECIPIENT` accumulate in sqlite and surface on the
/// dashboard's inbox view — they are never `recv`'d by an agent harness.
pub const OPERATOR_RECIPIENT: &str = "operator";

/// Sender hive-c0re uses for events it pushes into the manager's inbox.
/// Manager harness recognises this and parses the body as a `HelperEvent`.
pub const SYSTEM_SENDER: &str = "system";

/// Out-of-band events the host-side daemon pushes to the manager's inbox.
/// Serialised as JSON in `Message::body` (sender = `SYSTEM_SENDER`).
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "event", rename_all = "snake_case")]
pub enum HelperEvent {
    /// An approval was approved/denied/failed; if approved, the underlying
    /// action (rebuild or spawn) has already run by the time this lands.
    ApprovalResolved {
        id: i64,
        agent: String,
        commit_ref: String,
        status: ApprovalStatus,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        note: Option<String>,
    },
    /// A new container was spawned (post-approval or via the admin CLI
    /// bypass path). `ok=false` means the spawn failed.
    Spawned {
        agent: String,
        ok: bool,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        note: Option<String>,
    },
    /// A container was rebuilt (auto-update on flake rev change, or a
    /// manual rebuild from CLI/dashboard).
    Rebuilt {
        agent: String,
        ok: bool,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        note: Option<String>,
    },
    /// A sub-agent's container was stopped (the systemd unit is down;
    /// persistent state is unchanged).
    Killed { agent: String },
    /// A sub-agent's container was torn down (container removed; state
    /// dirs preserved per `destroy` semantics).
    Destroyed { agent: String },
    /// The operator answered a question that was queued via
    /// `AskOperator`. `id` matches the `QuestionQueued.id` returned to the
    /// asker; `question` echoes the original prompt so the manager can
    /// stitch the answer back to context across compactions.
    OperatorAnswered {
        id: i64,
        question: String,
        answer: String,
    },
}

/// Requests on the manager socket. Manager has the agent surface (send/recv)
/// plus privileged lifecycle verbs.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "cmd", rename_all = "snake_case")]
pub enum ManagerRequest {
    Send {
        to: String,
        body: String,
    },
    Recv,
    /// Non-mutating: pending message count, used to render a status line
    /// after each MCP tool call (mirrors `AgentRequest::Status`).
    Status,
    /// Operator-injected message TO the manager (from the manager's own web
    /// UI). Same shape as `AgentRequest::OperatorMsg`.
    OperatorMsg {
        body: String,
    },
    /// Submit a spawn request for the user to approve. On approval the host
    /// creates and starts the container. Brand-new agent names only — if an
    /// agent of the same name already exists, the approval will fail.
    RequestSpawn {
        name: String,
    },
    /// Stop a sub-agent (graceful).
    Kill {
        name: String,
    },
    /// Start a previously-stopped sub-agent container.
    Start {
        name: String,
    },
    /// Restart a sub-agent container (stop + start).
    Restart {
        name: String,
    },
    /// Submit a config commit for the user to approve. `commit_ref` is opaque
    /// to the host (typically a git sha pointing into the agent's config repo).
    /// On approval the host applies the change via `nixos-container update`.
    RequestApplyCommit {
        agent: String,
        commit_ref: String,
    },
    /// Ask the operator a question. The host-side handler blocks until the
    /// operator answers via the dashboard; the answer is then returned as the
    /// response. `options` is advisory: an empty list means free-text.
    AskOperator {
        question: String,
        #[serde(default)]
        options: Vec<String>,
    },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "kind", rename_all = "snake_case")]
pub enum ManagerResponse {
    Ok,
    Err {
        message: String,
    },
    Message {
        from: String,
        body: String,
    },
    Empty,
    Status {
        unread: u64,
    },
    /// Result of `AskOperator`: the queued question id. The actual answer
    /// arrives later as a `HelperEvent::OperatorAnswered` in the manager
    /// inbox, so this returns immediately rather than blocking the turn.
    QuestionQueued {
        id: i64,
    },
}