//! Wire types for the *in-agent* socket, served by the hive-agent harness
//! to the in-container producers. Matrix / bash MCP daemons and
//! `forge_notify` are the built-in ones today, but `subsystem` on the todo
//! ops below is a plain string, not a closed set: any user-configured MCP
//! server declared in an agent's `agent.nix` can dial this socket and push
//! its own todos the same way. Carries the loose-ends-v2 *todo* op family
//! plus the harness-local *reminder* and *question* op families; more
//! in-agent request families may be added over time (the socket is
//! deliberately named for the agent, not the todos).
//!
//! Distinct from `hive-core-agent-sock`, the *host*-served core↔agent
//! protocol on `/run/hive/mcp.sock`: this socket never leaves the
//! container. The harness owns the todo + reminder stores locally and
//! signals its own turn loop directly, so hive-c0re is not in either path —
//! no broker round-trip, no long-poll, no marker files.

use serde::{Deserialize, Serialize};

use hive_sh4re::inbox::LooseEnd;

pub mod paths;

/// In-container path of the harness-served in-agent socket. The harness
/// binds it on boot; the in-container producers dial it for todo ops.
/// (Placeholder default — the harness + producers resolve the real path
/// from config; kept here so a producer with no override has a sane one.)
pub const DEFAULT_AGENT_SOCKET: &str = "/run/hive/agent.sock";

/// A request on the in-agent socket. Serialised with a `cmd` tag so the
/// in-container producers can emit a plain JSON line without linking a
/// typed client (matrix/bash build the JSON by hand; a user-configured
/// MCP server can do the same with its own `subsystem` marker).
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "cmd", rename_all = "snake_case")]
pub enum Request {
    /// Upsert a todo from an in-container subsystem — matrix / bash /
    /// forge are the built-in producers, but any subsystem name is
    /// accepted; nothing restricts `subsystem` to a fixed set, so a
    /// user-configured MCP server can push its own todos here too.
    /// `subsystem` is the producer marker; `key` the optional
    /// subsystem-specific dedup key (a matrix room id, a bash task id).
    /// A new-or-changed row signals the turn loop; an identical keyed
    /// re-push is a silent no-op. Keyless todos always insert as one-offs.
    ///
    /// `reopen_if_acked` (default `false`) governs what "changed" means
    /// for an *acked* row with byte-identical `summary`/`source`: by
    /// default it stays quiet — the right behavior for a reconciler
    /// producer re-announcing a still-true condition (`disk_watch` polling
    /// and finding the same problem). A producer whose keyed re-push
    /// represents a genuinely new occurrence rather than a restatement
    /// (a recurring scheduled prompt firing again with the same body) sets
    /// this `true` so an acked row reopens and re-wakes instead of being
    /// silently swallowed by the previous occurrence's ack.
    UpsertTodo {
        subsystem: String,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        key: Option<String>,
        summary: String,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        source: Option<String>,
        #[serde(default)]
        reopen_if_acked: bool,
    },
    /// Clear producer-resolved todo(s). `key = Some(k)` clears the one
    /// keyed row; `key = None` clears the subsystem's keyless rows; `all
    /// = true` wipes the producer's whole set (cancel-and-recreate on
    /// daemon restart).
    ClearTodo {
        subsystem: String,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        key: Option<String>,
        #[serde(default)]
        all: bool,
    },
    /// List todos, optionally filtered to one `subsystem` (a producer
    /// reconciling its own set). `None` = all.
    ListTodos {
        #[serde(default, skip_serializing_if = "Option::is_none")]
        subsystem: Option<String>,
    },
    /// The agent marks one of its own todos done, by id.
    MarkTodoDone { id: i64 },
    /// The agent bulk-acks a specific, explicit list of its own todos in
    /// one shot — for clearing a backlog that's piled up past the point of
    /// per-id triage, without the range-based `ack_until`-style semantics
    /// that risk silently acking something never actually looked at (see
    /// `Todos::mark_done_many`'s doc for why it's ids, not a threshold).
    MarkTodosDone { ids: Vec<i64> },
    /// Schedule a reminder that fires into this agent's own turn loop at
    /// `timing` (harness-local — no broker round-trip). Same semantics as
    /// the old broker `Remind` request. `file_path`, when set, is where the
    /// harness persists an over-cap body instead of inlining it.
    StoreReminder {
        message: String,
        timing: hive_sh4re::inbox::ReminderTiming,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        file_path: Option<String>,
    },
    /// List this agent's pending reminders (single-agent scope — unlike
    /// the old broker query, there's no cross-agent `agent` filter here).
    ListReminders,
    /// Cancel one of this agent's own pending reminders by id, before it
    /// fires.
    CancelReminder { id: i64 },
    /// This agent's pending-reminder count — used by the pre-`remind` cap
    /// check and the harness's own turn-stats sink.
    CountPendingReminders,
    /// Scheduled/delivered/pending reminder counts over a trailing
    /// `since_secs` window (`0` = all time) — the harness's own `/api/stats`
    /// reminder-activity chart data (was `hive-core-agent-sock`'s
    /// `ReminderRollup` against the broker; now served from the local store).
    ReminderRollup { since_secs: u64 },
    /// Agent self-service request to compact the current session, mirroring
    /// the operator's `/compact` dashboard button. Gated server-side: only
    /// honoured when the last completed turn's context usage is above 66%
    /// of the effective context window — below that, `Response::Err`
    /// explains why and takes no action. On a pass, queues the same
    /// deferred `compact_pending` flag the operator's button sets (consumed
    /// at the next turn boundary), so it never races a live claude process.
    /// `wake_prompt`, when set, is driven as a synthetic follow-up turn once
    /// the compaction actually finishes — the dashboard button's own
    /// requests go through `Bus::request_compact` directly with `None`, not
    /// through this variant, since a human watching the dashboard isn't
    /// waiting on a wake.
    Compact { wake_prompt: Option<String> },
    /// Mirror an outstanding question this agent asked (`ask()` succeeded).
    /// `target` is who it's waiting on (`"operator"` when asked with
    /// `to: None`). Part of the questions-mirror increment — see
    /// `hive-agent::questions`.
    RecordAskedQuestion {
        id: i64,
        target: String,
        question: String,
    },
    /// Mirror an outstanding question this agent was asked (a
    /// `question_asked` system event arrived in the inbox). `asker` is who's
    /// waiting on this agent for a reply.
    RecordAnsweringQuestion {
        id: i64,
        asker: String,
        question: String,
    },
    /// Drop the mirror row for `id` (either role) — the question resolved
    /// from this agent's side (answered, or the `question_answered` event
    /// for a question this agent asked arrived).
    ClearQuestion { id: i64 },
    /// List this agent's mirrored questions (both roles) — single-agent
    /// scope, same shape as `ListReminders`.
    ListQuestions,
}

/// A response on the in-agent socket. Serialised with a `kind` tag,
/// mirroring the core↔agent protocol's response shape.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "kind", rename_all = "snake_case")]
pub enum Response {
    /// Op succeeded, no payload.
    Ok,
    /// Op succeeded and touched `count` rows (clear / mark-done).
    Acked { count: u64 },
    /// `ListTodos` / `ListReminders` / `ListQuestions` result (each wraps
    /// its rows as the matching [`LooseEnd`] variant).
    LooseEnds { loose_ends: Vec<LooseEnd> },
    /// `CountPendingReminders` result.
    PendingRemindersCount { count: u64 },
    /// `ReminderRollup` result.
    ReminderRollup {
        stats: hive_sh4re::approvals::ReminderStats,
    },
    /// Op failed; `message` is operator-facing.
    Err { message: String },
}