phi-telemetry 0.7.1

//! Structured metrics types for Agent observability.
//!
//! These types were moved from agent-base to phi-telemetry so that agent-base
//! remains a pure runtime kernel with no knowledge of metrics.

use serde::{Deserialize, Serialize};
use serde_json::Value;
use std::collections::HashMap;

// ── Outcome enums ──

/// Outcome of a single turn (one LLM interaction).
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TurnOutcome {
    /// Turn completed successfully (text response, no tool calls).
    Completed,
    /// Turn ended with tool calls (agent will loop back for another turn).
    ToolCalls,
    /// Turn ended with an error.
    Error,
    /// Turn hit the max-turns safety limit.
    MaxTurns,
    /// User cancelled this turn.
    Cancelled,
}

/// Outcome of a session (the entire conversation).
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum SessionOutcome {
    /// Session completed normally.
    Completed,
    /// Session ended with an unrecoverable error.
    Failed,
    /// User cancelled the session.
    Cancelled,
    /// Max turns exceeded (safety limit).
    MaxTurns,
}

// ── TurnMetrics ──

/// Per-turn metrics — one per LLM interaction.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct TurnMetrics {
    // Timing
    pub turn_number: u32,
    pub started_at: String, // ISO8601
    pub duration_ms: u64,

    // Latency breakdown
    pub time_to_first_token_ms: u64,
    pub llm_duration_ms: u64,
    pub tool_duration_ms: u64,

    // LLM
    pub llm_calls: u32,
    pub input_tokens: u64,
    pub output_tokens: u64,
    #[serde(default)]
    pub thinking_tokens: u64,
    /// Byte length of reasoning/thinking content (always available, even when
    /// the provider does not report reasoning token counts).
    #[serde(default)]
    pub thinking_bytes: u64,
    pub model: String,

    // Tool
    pub tool_call_count: u32,
    pub tools_used: Vec<String>,
    pub tool_success: u32,
    pub tool_failed: u32,

    // Result
    pub outcome: TurnOutcome,
    pub text_length: u64,
    pub error_message: Option<String>,
    pub has_thinking: bool,

    // Meta events
    #[serde(default)]
    pub plan_updates: u32,
    #[serde(default)]
    pub approval_count: u32,

    // User input (truncated to 80 chars)
    pub user_input: String,

    // Business extension
    #[serde(default)]
    pub custom: Value,
}

impl TurnMetrics {
    /// Create a new TurnMetrics with defaults (custom = {}).
    pub fn new(
        turn_number: u32,
        started_at: String,
        duration_ms: u64,
        model: String,
        user_input: String,
        outcome: TurnOutcome,
    ) -> Self {
        Self {
            turn_number,
            started_at,
            duration_ms,
            time_to_first_token_ms: 0,
            llm_duration_ms: 0,
            tool_duration_ms: 0,
            llm_calls: 1,
            input_tokens: 0,
            output_tokens: 0,
            thinking_tokens: 0,
            thinking_bytes: 0,
            model,
            tool_call_count: 0,
            tools_used: Vec::new(),
            tool_success: 0,
            tool_failed: 0,
            outcome,
            text_length: 0,
            error_message: None,
            has_thinking: false,
            plan_updates: 0,
            approval_count: 0,
            user_input: truncate_str(&user_input, 80),
            custom: Value::Object(serde_json::Map::new()),
        }
    }
}

// ── SessionMetrics ──

/// Accumulated session metrics. Written incrementally to `session_metrics.json`
/// at the end of each turn.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct SessionMetrics {
    // Identity
    pub session_id: String,
    #[serde(default)]
    pub node_id: String,
    pub created_at: String,

    // LLM summary
    pub model: String,
    pub total_input_tokens: u64,
    pub total_output_tokens: u64,
    #[serde(default)]
    pub total_thinking_tokens: u64,
    /// Total byte length of reasoning/thinking content across all turns.
    #[serde(default)]
    pub total_thinking_bytes: u64,
    pub estimated_cost: f64,

    // Characters (always available, even without API token support)
    #[serde(default)]
    pub total_chars: u64,

    // Tool summary
    pub total_tool_calls: u32,
    pub tool_breakdown: HashMap<String, u32>,
    pub tool_fail_rate: f64,
    /// Running total of failed tool calls.
    #[serde(default)]
    pub total_failed: u32,

    // Timing
    pub total_duration_ms: u64,
    pub total_llm_ms: u64,
    pub total_tool_ms: u64,
    pub total_turns: u32,
    pub avg_turn_ms: u64,
    pub p50_turn_ms: u64,
    pub p95_turn_ms: u64,
    pub p99_turn_ms: u64,

    // Outcome
    pub outcome: SessionOutcome,
    pub error_count: u32,

    // Meta events
    #[serde(default)]
    pub total_plan_updates: u32,
    #[serde(default)]
    pub total_approvals: u32,

    // Business extension
    #[serde(default)]
    pub custom: Value,

    // Multi-agent reservation (Phase 1: always None / "default")
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub parent_session_id: Option<String>,
    #[serde(default = "default_session_type")]
    pub session_type: String,

    // Per-turn details
    pub turns: Vec<TurnMetrics>,
}

fn default_session_type() -> String {
    "default".to_string()
}

impl SessionMetrics {
    /// Create a new session metrics accumulator (empty turns).
    pub fn new(session_id: String, node_id: String, model: String) -> Self {
        Self {
            session_id,
            node_id,
            created_at: chrono::Utc::now().to_rfc3339(),
            model,
            total_input_tokens: 0,
            total_output_tokens: 0,
            total_thinking_tokens: 0,
            total_thinking_bytes: 0,
            estimated_cost: 0.0,
            total_chars: 0,
            total_tool_calls: 0,
            tool_breakdown: HashMap::new(),
            tool_fail_rate: 0.0,
            total_failed: 0,
            total_duration_ms: 0,
            total_llm_ms: 0,
            total_tool_ms: 0,
            total_turns: 0,
            avg_turn_ms: 0,
            p50_turn_ms: 0,
            p95_turn_ms: 0,
            p99_turn_ms: 0,
            outcome: SessionOutcome::Completed,
            error_count: 0,
            total_plan_updates: 0,
            total_approvals: 0,
            custom: Value::Object(serde_json::Map::new()),
            parent_session_id: None,
            session_type: "default".to_string(),
            turns: Vec::new(),
        }
    }

    /// Append a turn and recompute session-level aggregates.
    pub fn append_turn(&mut self, turn: TurnMetrics) {
        self.total_turns += 1;
        self.total_input_tokens += turn.input_tokens;
        self.total_output_tokens += turn.output_tokens;
        self.total_thinking_tokens += turn.thinking_tokens;
        self.total_thinking_bytes += turn.thinking_bytes;
        self.total_chars += turn.text_length;
        self.total_duration_ms += turn.duration_ms;
        self.total_llm_ms += turn.llm_duration_ms;
        self.total_tool_ms += turn.tool_duration_ms;
        self.total_tool_calls += turn.tool_call_count;

        // Tool breakdown
        for tool_name in &turn.tools_used {
            *self.tool_breakdown.entry(tool_name.clone()).or_insert(0) += 1;
        }

        // Tool fail rate (incremental — O(1) per turn)
        self.total_failed += turn.tool_failed;
        if self.total_tool_calls > 0 {
            self.tool_fail_rate = self.total_failed as f64 / self.total_tool_calls as f64;
        }

        // Error count
        if matches!(turn.outcome, TurnOutcome::Error) {
            self.error_count += 1;
        }

        // Meta events
        self.total_plan_updates += turn.plan_updates;
        self.total_approvals += turn.approval_count;

        // Average turn duration
        self.avg_turn_ms = self.total_duration_ms / self.total_turns as u64;

        // Update model to the most frequently used one
        {
            let mut model_counts: HashMap<String, u32> = HashMap::new();
            for t in &self.turns {
                if !t.model.is_empty() {
                    *model_counts.entry(t.model.clone()).or_insert(0) += 1;
                }
            }
            if !turn.model.is_empty() {
                *model_counts.entry(turn.model.clone()).or_insert(0) += 1;
            }
            if let Some(top_model) = model_counts
                .into_iter()
                .max_by_key(|(_, count)| *count)
                .map(|(m, _)| m)
            {
                self.model = top_model;
            }
        }

        // Percentiles
        self.turns.push(turn);
        self.recompute_percentiles();
    }

    /// Recompute P50/P95/P99 from stored turn durations.
    fn recompute_percentiles(&mut self) {
        if self.turns.is_empty() {
            self.p50_turn_ms = 0;
            self.p95_turn_ms = 0;
            self.p99_turn_ms = 0;
            return;
        }

        let mut durations: Vec<u64> = self.turns.iter().map(|t| t.duration_ms).collect();
        durations.sort_unstable();

        self.p50_turn_ms = percentile_from_sorted(&durations, 50.0);
        self.p95_turn_ms = percentile_from_sorted(&durations, 95.0);
        self.p99_turn_ms = percentile_from_sorted(&durations, 99.0);
    }

    /// Finalize the session — recompute percentiles and set outcome.
    pub fn finalize(&mut self, outcome: SessionOutcome) {
        self.outcome = outcome;
        self.recompute_percentiles();
    }

    /// Merge another accumulator's per-turn records into this one and rebuild
    /// every session-level aggregate from the merged list.
    ///
    /// Turns are deduplicated on `(turn_number, started_at)`, so the union is
    /// idempotent: re-saving the same turns from the same process changes
    /// nothing, while turns recorded by another writer over the same session
    /// (a TUI session switch, a new process resuming it) are folded in instead
    /// of clobbering the history. Identity/custom fields and `outcome` keep
    /// `self`'s values — the caller decides whose identity and final state win.
    pub fn merge_turns(&mut self, other: &SessionMetrics) {
        let known: std::collections::HashSet<(u32, String)> = self
            .turns
            .iter()
            .map(|t| (t.turn_number, t.started_at.clone()))
            .collect();
        for t in &other.turns {
            if known.contains(&(t.turn_number, t.started_at.clone())) {
                continue;
            }
            self.turns.push(t.clone());
        }
        self.turns.sort_by(|a, b| {
            a.started_at
                .cmp(&b.started_at)
                .then(a.turn_number.cmp(&b.turn_number))
        });
        self.rebuild_aggregates();
    }

    /// Recompute all incremental aggregates from scratch by replaying
    /// `append_turn` over the stored turns (every total it maintains is a
    /// function of the turn list).
    fn rebuild_aggregates(&mut self) {
        self.total_input_tokens = 0;
        self.total_output_tokens = 0;
        self.total_thinking_tokens = 0;
        self.total_thinking_bytes = 0;
        self.total_chars = 0;
        self.total_duration_ms = 0;
        self.total_llm_ms = 0;
        self.total_tool_ms = 0;
        self.total_tool_calls = 0;
        self.tool_breakdown.clear();
        self.total_failed = 0;
        self.tool_fail_rate = 0.0;
        self.error_count = 0;
        self.total_plan_updates = 0;
        self.total_approvals = 0;
        self.total_turns = 0;
        self.avg_turn_ms = 0;
        self.model = String::new();

        let turns = std::mem::take(&mut self.turns);
        for t in turns {
            self.append_turn(t);
        }
    }
}

// ── Summary for CLI listing ──

/// Lightweight summary returned by `list_all()`.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct SessionSummary {
    pub session_id: String,
    pub node_id: String,
    pub created_at: String,
    pub model: String,
    pub total_turns: u32,
    pub total_chars: u64,
    pub outcome: SessionOutcome,
    /// Product name from custom field, if set (e.g. "phi-bard").
    pub product: Option<String>,
}

// ── Helpers ──

/// Compute the `p`-th percentile from an already-sorted slice of values.
pub(crate) fn percentile_from_sorted(sorted: &[u64], p: f64) -> u64 {
    if sorted.is_empty() {
        return 0;
    }
    let n = sorted.len() as f64;
    let idx = ((p / 100.0) * (n - 1.0)).round() as usize;
    sorted[idx.min(sorted.len() - 1)]
}

/// Truncate a string to `max_chars` characters, appending "..." if truncated.
pub(crate) fn truncate_str(s: &str, max_chars: usize) -> String {
    if s.chars().count() > max_chars {
        let truncated: String = s.chars().take(max_chars).collect();
        format!("{}...", truncated)
    } else {
        s.to_string()
    }
}

// ── Conversion from agent-base ──

/// Convert an agent-base `RunOutcome` to a turn-level `TurnOutcome`.
/// Checks `tools_used` to distinguish `ToolCalls` from `Completed`.
pub fn run_outcome_to_turn_outcome(
    outcome: &agent_base::RunOutcome,
    tools_used: &[String],
) -> TurnOutcome {
    match outcome {
        agent_base::RunOutcome::Completed => {
            if tools_used.is_empty() {
                TurnOutcome::Completed
            } else {
                TurnOutcome::ToolCalls
            }
        }
        // Continuing means the guard nudged — treat as a completed turn
        // (the run will loop, but this turn is done).
        agent_base::RunOutcome::Continuing => TurnOutcome::Completed,
        agent_base::RunOutcome::Failed { .. } => TurnOutcome::Error,
        agent_base::RunOutcome::Cancelled => TurnOutcome::Cancelled,
        agent_base::RunOutcome::MaxTurnsExceeded { .. } => TurnOutcome::MaxTurns,
    }
}

/// Convert agent-base `RunOutcome` to `SessionOutcome`.
pub fn run_outcome_to_session_outcome(outcome: &agent_base::RunOutcome) -> SessionOutcome {
    match outcome {
        agent_base::RunOutcome::Completed => SessionOutcome::Completed,
        agent_base::RunOutcome::Continuing => SessionOutcome::Completed,
        agent_base::RunOutcome::Failed { .. } => SessionOutcome::Failed,
        agent_base::RunOutcome::Cancelled => SessionOutcome::Cancelled,
        agent_base::RunOutcome::MaxTurnsExceeded { .. } => SessionOutcome::MaxTurns,
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_truncate_str() {
        assert_eq!(truncate_str("hello", 10), "hello");
        assert_eq!(
            truncate_str("hello world this is long", 10),
            "hello worl..."
        );
        assert_eq!(truncate_str("你好世界测试文本", 4), "你好世界...");
    }

    #[test]
    fn test_percentile_from_sorted() {
        let data = vec![10, 20, 30, 40, 50, 60, 70, 80, 90, 100];
        assert_eq!(percentile_from_sorted(&data, 50.0), 60);
        assert_eq!(percentile_from_sorted(&data, 95.0), 100);
        assert_eq!(percentile_from_sorted(&data, 0.0), 10);
        assert_eq!(percentile_from_sorted(&data, 100.0), 100);
    }

    #[test]
    fn test_percentile_empty() {
        assert_eq!(percentile_from_sorted(&[], 50.0), 0);
    }

    /// Helper: one turn with the given number/timestamp/duration/model.
    fn turn(n: u32, at: &str, dur: u64, model: &str) -> TurnMetrics {
        let mut t = TurnMetrics::new(
            n,
            at.to_string(),
            dur,
            model.to_string(),
            "input".to_string(),
            TurnOutcome::Completed,
        );
        t.input_tokens = 100;
        t.output_tokens = 10;
        t
    }

    #[test]
    fn merge_turns_unions_disjoint_writers_and_rebuilds_totals() {
        let mut base = SessionMetrics::new("s".into(), "".into(), "m1".into());
        base.append_turn(turn(1, "2026-08-01T12:00:00Z", 1000, "m1"));
        // A second writer recorded two different turns (e.g. after a resume).
        let mut other = SessionMetrics::new("s".into(), "".into(), "m2".into());
        other.append_turn(turn(2, "2026-08-01T12:01:00Z", 2000, "m2"));
        other.append_turn(turn(3, "2026-08-01T12:02:00Z", 3000, "m2"));

        base.merge_turns(&other);

        assert_eq!(base.total_turns, 3);
        assert_eq!(base.turns.len(), 3);
        // Turns are ordered by time regardless of which writer recorded them.
        assert_eq!(
            base.turns.iter().map(|t| t.turn_number).collect::<Vec<_>>(),
            vec![1, 2, 3]
        );
        // Aggregates rebuilt over the union.
        assert_eq!(base.total_input_tokens, 300);
        assert_eq!(base.total_output_tokens, 30);
        assert_eq!(base.total_duration_ms, 6000);
        assert_eq!(base.avg_turn_ms, 2000);
        // Model = most frequent across merged turns (2×m2 beats 1×m1).
        assert_eq!(base.model, "m2");
    }

    #[test]
    fn merge_turns_dedupes_on_turn_number_and_started_at() {
        let mut base = SessionMetrics::new("s".into(), "".into(), "m1".into());
        base.append_turn(turn(1, "2026-08-01T12:00:00Z", 1000, "m1"));
        let before = base.clone();

        // Re-merging the same turns (same process re-saving) must be a no-op.
        base.merge_turns(&before);
        assert_eq!(base.total_turns, 1);
        assert_eq!(base.total_input_tokens, 100);

        // Same turn_number but a different timestamp is a different turn —
        // two processes can both record "turn 1" of the same session.
        let mut fresh = SessionMetrics::new("s".into(), "".into(), "m1".into());
        fresh.append_turn(turn(1, "2026-08-02T09:00:00Z", 500, "m1"));
        base.merge_turns(&fresh);
        assert_eq!(base.total_turns, 2);
        assert_eq!(base.total_duration_ms, 1500);
    }

    #[test]
    fn merge_turns_preserves_identity_and_outcome() {
        let mut base = SessionMetrics::new("s-old".into(), "node-9".into(), "m1".into());
        base.custom = serde_json::json!({"product": "phimint"});
        base.outcome = SessionOutcome::Failed;
        base.append_turn(turn(1, "2026-08-01T12:00:00Z", 1000, "m1"));

        let mut other = SessionMetrics::new("s-new".into(), "node-x".into(), "m2".into());
        other.outcome = SessionOutcome::Completed;
        other.append_turn(turn(2, "2026-08-01T12:01:00Z", 2000, "m2"));

        base.merge_turns(&other);

        // Identity/custom/outcome keep `self`'s values — save_metrics grants
        // the writer's outcome explicitly after merging.
        assert_eq!(base.session_id, "s-old");
        assert_eq!(base.node_id, "node-9");
        assert_eq!(base.custom, serde_json::json!({"product": "phimint"}));
        assert_eq!(base.outcome, SessionOutcome::Failed);
    }

    #[test]
    fn test_session_metrics_new() {
        let m = SessionMetrics::new(
            "20260729_test".to_string(),
            "".to_string(),
            "claude-sonnet".to_string(),
        );
        assert_eq!(m.session_id, "20260729_test");
        assert_eq!(m.node_id, "");
        assert_eq!(m.model, "claude-sonnet");
        assert_eq!(m.total_turns, 0);
        assert_eq!(m.parent_session_id, None);
        assert_eq!(m.session_type, "default");
        assert!(m.turns.is_empty());
    }

    #[test]
    fn test_session_metrics_append_turn() {
        let mut m = SessionMetrics::new(
            "test".to_string(),
            "".to_string(),
            "claude-sonnet".to_string(),
        );
        let turn = TurnMetrics {
            turn_number: 1,
            started_at: "2026-07-29T00:00:00Z".to_string(),
            duration_ms: 1000,
            time_to_first_token_ms: 200,
            llm_duration_ms: 800,
            tool_duration_ms: 100,
            llm_calls: 1,
            input_tokens: 500,
            output_tokens: 300,
            thinking_tokens: 0,
            thinking_bytes: 0,
            model: "claude-sonnet".to_string(),
            tool_call_count: 1,
            tools_used: vec!["shell".to_string()],
            tool_success: 1,
            tool_failed: 0,
            outcome: TurnOutcome::ToolCalls,
            text_length: 200,
            error_message: None,
            has_thinking: true,
            plan_updates: 0,
            approval_count: 0,
            user_input: "test input".to_string(),
            custom: Value::Object(serde_json::Map::new()),
        };
        m.append_turn(turn);
        assert_eq!(m.total_turns, 1);
        assert_eq!(m.total_input_tokens, 500);
        assert_eq!(m.total_output_tokens, 300);
        assert_eq!(m.total_duration_ms, 1000);
        assert_eq!(m.total_tool_calls, 1);
        assert_eq!(m.tool_breakdown.get("shell"), Some(&1));
        assert_eq!(m.tool_fail_rate, 0.0);
        assert_eq!(m.avg_turn_ms, 1000);
        assert_eq!(m.p50_turn_ms, 1000);
    }

    #[test]
    fn test_session_metrics_append_multiple_turns() {
        let mut m = SessionMetrics::new(
            "test".to_string(),
            "".to_string(),
            "claude-sonnet".to_string(),
        );
        for i in 1..=5 {
            let turn = TurnMetrics {
                turn_number: i,
                started_at: "2026-07-29T00:00:00Z".to_string(),
                duration_ms: i as u64 * 1000,
                time_to_first_token_ms: 200,
                llm_duration_ms: 800,
                tool_duration_ms: 100,
                llm_calls: 1,
                input_tokens: 500,
                output_tokens: 300,
                thinking_tokens: 0,
                thinking_bytes: 0,
                model: "claude-sonnet".to_string(),
                tool_call_count: 1,
                tools_used: vec!["shell".to_string()],
                tool_success: 1,
                tool_failed: 0,
                outcome: TurnOutcome::ToolCalls,
                text_length: 200,
                error_message: None,
                has_thinking: true,
                plan_updates: 0,
                approval_count: 0,
                user_input: "test".to_string(),
                custom: Value::Object(serde_json::Map::new()),
            };
            m.append_turn(turn);
        }
        assert_eq!(m.total_turns, 5);
        assert_eq!(m.total_duration_ms, 15000);
        assert_eq!(m.avg_turn_ms, 3000);
        assert_eq!(m.p50_turn_ms, 3000);
    }

    #[test]
    fn test_session_metrics_thinking_bytes_accumulation() {
        let mut m = SessionMetrics::new(
            "test".to_string(),
            "".to_string(),
            "mimo-v2.5-pro".to_string(),
        );

        // Turn 1: has thinking content (43 bytes), provider reports 0 tokens
        let turn1 = TurnMetrics {
            turn_number: 1,
            started_at: "2026-07-29T00:00:00Z".to_string(),
            duration_ms: 1000,
            time_to_first_token_ms: 200,
            llm_duration_ms: 800,
            tool_duration_ms: 0,
            llm_calls: 1,
            input_tokens: 5000,
            output_tokens: 80,
            thinking_tokens: 0,
            thinking_bytes: 43,
            model: "mimo-v2.5-pro".to_string(),
            tool_call_count: 0,
            tools_used: vec![],
            tool_success: 0,
            tool_failed: 0,
            outcome: TurnOutcome::Completed,
            text_length: 100,
            error_message: None,
            has_thinking: true,
            plan_updates: 0,
            approval_count: 0,
            user_input: "test".to_string(),
            custom: Value::Object(serde_json::Map::new()),
        };
        m.append_turn(turn1);

        // Turn 2: more thinking content (86 bytes)
        let turn2 = TurnMetrics {
            turn_number: 2,
            started_at: "2026-07-29T00:00:01Z".to_string(),
            duration_ms: 1200,
            time_to_first_token_ms: 150,
            llm_duration_ms: 900,
            tool_duration_ms: 0,
            llm_calls: 1,
            input_tokens: 7000,
            output_tokens: 131,
            thinking_tokens: 0,
            thinking_bytes: 86,
            model: "mimo-v2.5-pro".to_string(),
            tool_call_count: 0,
            tools_used: vec![],
            tool_success: 0,
            tool_failed: 0,
            outcome: TurnOutcome::Completed,
            text_length: 200,
            error_message: None,
            has_thinking: true,
            plan_updates: 0,
            approval_count: 0,
            user_input: "test".to_string(),
            custom: Value::Object(serde_json::Map::new()),
        };
        m.append_turn(turn2);

        // thinking_tokens stays 0 (provider never reported), but bytes accumulate
        assert_eq!(m.total_thinking_tokens, 0);
        assert_eq!(m.total_thinking_bytes, 129); // 43 + 86
        assert_eq!(m.total_turns, 2);
    }

    #[test]
    fn test_turn_metrics_thinking_bytes_default() {
        let turn = TurnMetrics::new(
            1,
            "2026-07-29T00:00:00Z".to_string(),
            1000,
            "mimo-v2.5-pro".to_string(),
            "test".to_string(),
            TurnOutcome::Completed,
        );
        assert_eq!(turn.thinking_bytes, 0);
        assert_eq!(turn.thinking_tokens, 0);
    }

    #[test]
    fn test_session_metrics_backward_compat_thinking_bytes() {
        // Old JSON without thinking_bytes should deserialize with default 0
        let old_json = r#"{
            "session_id": "test",
            "node_id": "",
            "created_at": "2026-07-29T00:00:00Z",
            "model": "mimo-v2.5-pro",
            "total_input_tokens": 100,
            "total_output_tokens": 50,
            "total_thinking_tokens": 0,
            "estimated_cost": 0.0,
            "total_chars": 100,
            "total_tool_calls": 0,
            "tool_breakdown": {},
            "tool_fail_rate": 0.0,
            "total_duration_ms": 1000,
            "total_llm_ms": 800,
            "total_tool_ms": 0,
            "total_turns": 1,
            "avg_turn_ms": 1000,
            "p50_turn_ms": 1000,
            "p95_turn_ms": 1000,
            "p99_turn_ms": 1000,
            "outcome": "completed",
            "error_count": 0,
            "custom": {},
            "turns": []
        }"#;
        let m: SessionMetrics = serde_json::from_str(old_json).unwrap();
        assert_eq!(m.total_thinking_bytes, 0);
        assert_eq!(m.total_thinking_tokens, 0);
    }

    #[test]
    fn test_session_metrics_finalize() {
        let mut m = SessionMetrics::new(
            "test".to_string(),
            "".to_string(),
            "claude-sonnet".to_string(),
        );
        m.finalize(SessionOutcome::Completed);
        assert_eq!(m.outcome, SessionOutcome::Completed);
    }

    #[test]
    fn test_session_metrics_json_roundtrip() {
        let m = SessionMetrics::new(
            "20260729_test".to_string(),
            "node-1".to_string(),
            "claude-sonnet".to_string(),
        );
        let json = serde_json::to_string(&m).unwrap();
        let m2: SessionMetrics = serde_json::from_str(&json).unwrap();
        assert_eq!(m2.session_id, "20260729_test");
        assert_eq!(m2.node_id, "node-1");
        assert_eq!(m2.parent_session_id, None);
        assert_eq!(m2.session_type, "default");
    }

    #[test]
    fn test_session_metrics_backward_compat() {
        let old_json = r#"{
            "session_id": "test",
            "node_id": "",
            "created_at": "2026-07-29T00:00:00Z",
            "model": "claude-sonnet",
            "total_input_tokens": 0,
            "total_output_tokens": 0,
            "estimated_cost": 0.0,
            "total_chars": 0,
            "total_tool_calls": 0,
            "tool_breakdown": {},
            "tool_fail_rate": 0.0,
            "total_duration_ms": 0,
            "total_llm_ms": 0,
            "total_tool_ms": 0,
            "total_turns": 0,
            "avg_turn_ms": 0,
            "p50_turn_ms": 0,
            "p95_turn_ms": 0,
            "p99_turn_ms": 0,
            "outcome": "completed",
            "error_count": 0,
            "custom": {},
            "turns": []
        }"#;
        let m: SessionMetrics = serde_json::from_str(old_json).unwrap();
        assert_eq!(m.parent_session_id, None);
        assert_eq!(m.session_type, "default");
    }

    #[test]
    fn test_turn_metrics_custom_default() {
        let turn = TurnMetrics::new(
            1,
            "2026-07-29T00:00:00Z".to_string(),
            1000,
            "claude-sonnet".to_string(),
            "hello world".to_string(),
            TurnOutcome::Completed,
        );
        assert_eq!(turn.custom, Value::Object(serde_json::Map::new()));
        assert_eq!(turn.user_input, "hello world");
        let turn_long = TurnMetrics::new(
            1,
            "2026-07-29T00:00:00Z".to_string(),
            1000,
            "claude-sonnet".to_string(),
            "this is a very long user input that should definitely be truncated at eighty characters because that's the max we allow for storage".to_string(),
            TurnOutcome::Completed,
        );
        assert!(turn_long.user_input.chars().count() <= 83);
        assert!(turn_long.user_input.ends_with("..."));
    }

    #[test]
    fn test_run_outcome_conversion() {
        use agent_base::RunOutcome;

        // Completed with no tools → TurnOutcome::Completed
        assert_eq!(
            run_outcome_to_turn_outcome(&RunOutcome::Completed, &[]),
            TurnOutcome::Completed
        );

        // Completed with tools → TurnOutcome::ToolCalls
        assert_eq!(
            run_outcome_to_turn_outcome(&RunOutcome::Completed, &["shell".to_string()]),
            TurnOutcome::ToolCalls
        );

        // Failed → Error
        assert_eq!(
            run_outcome_to_turn_outcome(
                &RunOutcome::Failed {
                    error: "oops".to_string()
                },
                &[]
            ),
            TurnOutcome::Error
        );

        // Cancelled → Cancelled
        assert_eq!(
            run_outcome_to_turn_outcome(&RunOutcome::Cancelled, &[]),
            TurnOutcome::Cancelled
        );
    }
}