//! Helpers shared between `hive-ag3nt` (agent) and `hive-m1nd` (manager)
//! serve loops. Only pure functions with no wire-type dependency live here;
//! request/response-flavored helpers (`requeue_inflight`, `ack_turn`, etc.)
//! stay in each binary because they use different request enum variants.

use crate::events::Bus;
use crate::mcp::REDELIVERY_HINT;
use crate::turn::TurnOutcome;
use crate::turn_stats::TurnStatRow;

/// Assemble the per-turn wake prompt string. The role/tools/etc. live in the
/// system prompt; this is just the wake signal body. `unread` is the inbox
/// depth after this message was popped. `redelivered` prepends a "may already
/// be handled" banner.
#[must_use]
pub fn format_wake_prompt(from: &str, body: &str, unread: u64, redelivered: bool) -> String {
    let banner = if redelivered { REDELIVERY_HINT } else { "" };
    let pending = if unread == 0 {
        String::new()
    } else {
        format!(
            "\n\n({unread} more message(s) pending in your inbox — call `mcp__hyperhive__recv` \
             with `max: {unread}` to drain them all in one round-trip before acting.)"
        )
    };
    format!("{banner}Incoming message from `{from}`:\n---\n{body}\n---{pending}")
}

/// Current time as a Unix timestamp (seconds). Returns 0 on any error.
#[must_use]
pub fn now_unix() -> i64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .ok()
        .and_then(|d| i64::try_from(d.as_secs()).ok())
        .unwrap_or(0)
}

/// Assemble a `TurnStatRow` from the harness's per-turn state. Used by both
/// the agent and manager serve loops — the shape is identical, only the
/// post-turn count fetch helpers differ (and those stay in each binary).
#[must_use]
#[allow(clippy::too_many_arguments)]
pub fn build_row(
    started_at: i64,
    ended_at: i64,
    duration_ms: i64,
    model: String,
    wake_from: String,
    outcome: &TurnOutcome,
    bus: &Bus,
    open_threads_count: Option<u64>,
    open_reminders_count: Option<u64>,
) -> TurnStatRow {
    let cost = bus.last_cost_usage().unwrap_or_default();
    let ctx = bus.last_ctx_usage().unwrap_or(cost);
    let tool_calls = bus.take_tool_calls();
    let tool_call_count: u64 = tool_calls.values().copied().sum();
    let tool_call_breakdown_json = if tool_calls.is_empty() {
        None
    } else {
        serde_json::to_string(&tool_calls).ok()
    };
    let (result_kind, note) = match outcome {
        TurnOutcome::Ok => ("ok", None),
        TurnOutcome::Compacted => ("compacted", None),
        TurnOutcome::PromptTooLong => ("prompt_too_long", None),
        TurnOutcome::RateLimited => ("rate_limited", None),
        TurnOutcome::Failed(e) => ("failed", Some(format!("{e:#}"))),
    };
    TurnStatRow {
        started_at,
        ended_at,
        duration_ms,
        model,
        wake_from,
        input_tokens: cost.input_tokens,
        output_tokens: cost.output_tokens,
        cache_read_input_tokens: cost.cache_read_input_tokens,
        cache_creation_input_tokens: cost.cache_creation_input_tokens,
        last_input_tokens: ctx.input_tokens,
        last_output_tokens: ctx.output_tokens,
        last_cache_read_input_tokens: ctx.cache_read_input_tokens,
        last_cache_creation_input_tokens: ctx.cache_creation_input_tokens,
        tool_call_count,
        tool_call_breakdown_json,
        open_threads_count,
        open_reminders_count,
        result_kind,
        note,
    }
}