//! Domain types for agent lifecycle: turn events, session runtime, progress
//! reporting, prompts, and the agent-turn parameter bundle.

use serde::{Deserialize, Serialize};
use std::path::PathBuf;

use crate::core::{ChatMessage, ToolCallResult, UsageStats};

pub mod defaults;
pub mod progress;
pub mod prompt;

/// Which kind of caller (main agent vs. subagent vs. reviewer) is
/// invoking a tool, used to scope permissions and tag log/output paths.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Hash)]
pub enum Origin {
    /// The main agent turn loop.
    Main,
    /// A spawned subagent (test-gen, arch-review, security-review, etc.).
    SubAgent,
    /// The auto-inline review step after an edit.
    Reviewer,
}

impl Origin {
    /// Short string tag for this origin, used in filenames and logs.
    pub fn tag(self) -> String {
        match self {
            Origin::Main => "main",
            Origin::SubAgent => "subagent",
            Origin::Reviewer => "reviewer",
        }
        .to_string()
    }
}

/// Severity/category of a toast notification, used to pick its color.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ToastKind {
    Info,
    Success,
    Warning,
    Error,
    Lesson,
}

/// A transient status message shown in the TUI, auto-dismissed after `lifetime_ms`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Toast {
    pub kind: ToastKind,
    pub message: String,
    pub created_at: i64,
    pub lifetime_ms: u64,
}

impl Toast {
    /// Create a toast with a default 5-second lifetime, stamped with now.
    pub fn new(kind: ToastKind, message: String) -> Self {
        Toast {
            kind,
            message,
            created_at: chrono::Utc::now().timestamp_millis(),
            lifetime_ms: 5000,
        }
    }

    /// Whether this toast's lifetime has elapsed as of `now_ms`.
    pub fn expired(&self, now_ms: i64) -> bool {
        let lifetime = self.lifetime_ms as i64;
        now_ms - self.created_at > lifetime
    }
}

/// Agent status for workflow engine progress tracking.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum AgentStatus {
    Pending,
    Running,
    Completed,
    Failed(String),
    Cancelled,
}

impl std::fmt::Display for AgentStatus {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            AgentStatus::Pending => write!(f, "pending"),
            AgentStatus::Running => write!(f, "running"),
            AgentStatus::Completed => write!(f, "completed"),
            AgentStatus::Failed(msg) => write!(f, "failed: {msg}"),
            AgentStatus::Cancelled => write!(f, "cancelled"),
        }
    }
}

/// Events emitted onto the turn-event queue while an agent turn runs,
/// consumed by the event loop to update state and drive re-renders.
#[derive(Debug, Clone)]
pub enum TurnEvent {
    AssistantMessage(ChatMessage),
    ToolResult {
        tool_call_id: String,
        tool_name: String,
        output: String,
        is_error: bool,
        path: Option<String>,
    },
    SystemNote {
        kind: String,
        message: String,
    },
    StreamStart,
    StreamToken(String),
    StreamReasoning(String),
    StreamDone(ChatMessage),
    Usage {
        tokens_in: u64,
        tokens_out: u64,
    },
    ReviewUsage {
        tokens_in: u64,
        tokens_out: u64,
    },
    Compacted(Vec<ChatMessage>),
    Error(String),
    Done,
    WorkflowAgentUpdate {
        agent_id: String,
        agent_name: String,
        status: AgentStatus,
    },
    TodoUpdate(String),
    PlanUpdate(String),
    /// Structured progress report from a subagent or workflow node,
    /// carrying the current tool name and optional step counters.
    AgentProgress(crate::agent::progress::AgentProgress),
}

/// How a pending tool call should be executed when the turn resumes.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ExecutionModel {
    Inline,
    Deferred,
    AsyncTokio,
}

/// A tool call awaiting execution, along with which execution model
/// (inline, deferred, async) it should run under.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PendingTool {
    pub tool_name: String,
    pub args: serde_json::Value,
    pub execution_model: ExecutionModel,
}

/// Reference to a background bash job tracked in session state.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BashJobRef {
    pub id: String,
    pub command: String,
    pub started_at: i64,
    pub running: bool,
}

/// Tracks counts of learned patterns by outcome and lifecycle stage.
#[derive(Debug, Clone, Default)]
pub struct LessonStats {
    /// Total number of lessons tracked.
    pub total: u32,
    /// User-initiated lessons.
    pub user: u32,
    /// Feedback-driven lessons.
    pub feedback: u32,
    /// Project-scoped lessons.
    pub project: u32,
    /// Reference-scoped lessons.
    pub reference: u32,
    /// Currently active lessons.
    pub active: u32,
    /// Stale (outdated) lessons.
    pub stale: u32,
    /// Contradicted lessons.
    pub contradicted: u32,
    /// Human-authored lessons.
    pub human: u32,
    /// Verified lessons.
    pub verified: u32,
    /// Unverified lessons.
    pub unverified: u32,
}

/// Per-session runtime state: message history, pending tool queue,
/// background bash jobs, lesson/review counters.
#[derive(Debug, Clone)]
pub struct SessionRuntime {
    pub messages: Vec<ChatMessage>,
    pub tool_call_results: Vec<ToolCallResult>,
    pub pending_tool_queue: Vec<PendingTool>,
    pub bash_jobs: Vec<BashJobRef>,
    pub subagent_queue: usize,
    pub edit_count: u32,
    pub consecutive_empty_reviews: u32,
    pub session_start: i64,
    /// Aggregated lesson statistics.
    pub lessons: LessonStats,
    pub review_count: u32,
    pub session_dir: PathBuf,
    pub usage: UsageStats,
    pub hive_mind_converged: bool,
}

impl SessionRuntime {
    pub fn new(session_dir: PathBuf) -> Self {
        SessionRuntime {
            messages: Vec::new(),
            tool_call_results: Vec::new(),
            pending_tool_queue: Vec::new(),
            bash_jobs: Vec::new(),
            subagent_queue: 0,
            edit_count: 0,
            consecutive_empty_reviews: 0,
            session_start: chrono::Utc::now().timestamp_millis(),
            lessons: LessonStats::default(),
            review_count: 0,
            session_dir,
            usage: UsageStats::default(),
            hive_mind_converged: false,
        }
    }

    pub fn push_message(&mut self, msg: ChatMessage) {
        self.messages.push(msg);
    }
}

/// Simple ASCII progress display for a long-running operation.
#[derive(Debug, Clone)]
pub struct ProgressState {
    pub current: u64,
    pub total: u64,
    pub message: String,
    pub start_time: i64,
}

use std::collections::VecDeque;
use std::sync::atomic::AtomicBool;
use std::sync::{Arc, Mutex};

/// Owned parameters required to spawn and execute an agent turn.
pub struct AgentTurnParams {
    pub messages: Vec<ChatMessage>,
    pub session_dir: PathBuf,
    pub workspace_roots: Vec<PathBuf>,
    pub turn_events: Arc<Mutex<VecDeque<TurnEvent>>>,
    pub in_flight: Arc<AtomicBool>,
    pub abort: Arc<AtomicBool>,
    pub api_key: String,
    pub model: String,
    pub api_base: Option<String>,
}