//! YAML schema for `team-compose.yaml` and `projects/<id>.yaml`.

use std::collections::BTreeMap;
use std::path::{Path, PathBuf};

use serde::{Deserialize, Serialize};

/// Top-level `team-compose.yaml`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Global {
    pub version: u32,

    #[serde(default)]
    pub broker: Broker,

    #[serde(default)]
    pub supervisor: SupervisorCfg,

    #[serde(default)]
    pub budget: Budget,

    #[serde(default)]
    pub hitl: Hitl,

    #[serde(default)]
    pub rate_limits: RateLimits,

    /// Human-facing inbound channels. Telegram is one adapter; Discord,
    /// iMessage, CLI, and webhook share the same shape.
    #[serde(default)]
    pub interfaces: Vec<Interface>,

    /// Relative paths from the compose root.
    #[serde(default)]
    pub projects: Vec<ProjectRef>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Interface {
    /// Adapter type: `telegram`, `discord`, `imessage`, `cli`, `webhook`, ...
    pub r#type: String,
    /// Free-form name; used in logs and to route approvals.
    pub name: String,
    /// Adapter-specific config (bot token, channel id, allowlist, …).
    #[serde(default)]
    pub config: serde_yaml::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct Budget {
    #[serde(default)]
    pub daily_usd_limit: Option<f64>,
    #[serde(default)]
    pub warn_threshold_pct: Option<u32>,
    #[serde(default)]
    pub message_ttl_hours: Option<u32>,
    #[serde(default)]
    pub per_project_usd_limit: std::collections::BTreeMap<String, f64>,
}

/// Rate-limit handling policy.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct RateLimits {
    /// Default hook-name chain to run on a hit. Empty means `[wait]`.
    #[serde(default)]
    pub default_on_hit: Vec<String>,

    /// Named hooks. Agents reference these by name in their `on_rate_limit:`.
    #[serde(default)]
    pub hooks: Vec<RateLimitHook>,

    /// Fallback wait when the hit can't be parsed for a reset time.
    /// Default 30 minutes.
    #[serde(default = "default_fallback_wait")]
    pub fallback_wait_seconds: u64,
}

fn default_fallback_wait() -> u64 {
    30 * 60
}

/// One named action that can run on a rate-limit hit.
///
/// `action` is one of:
/// - `wait` — sleep until `resets_at` (or `fallback_wait_seconds`).
/// - `send` — write a message into the mailbox; `to` and `template` required.
/// - `webhook` — POST/GET to `url` (or `url_env`); the rate-limit row
///   serializes as JSON in the body.
/// - `run` — exec `command` with placeholders substituted.
///
/// Placeholders in `template` and `command` arguments:
/// `{agent}`, `{runtime}`, `{hit_at}`, `{resets_at}`, `{resets_at_local}`,
/// `{raw_match}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RateLimitHook {
    pub name: String,
    pub action: String,
    #[serde(default)]
    pub to: Option<String>,
    #[serde(default)]
    pub template: Option<String>,
    #[serde(default)]
    pub url: Option<String>,
    #[serde(default)]
    pub url_env: Option<String>,
    #[serde(default)]
    pub method: Option<String>,
    #[serde(default)]
    pub command: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Hitl {
    #[serde(default = "default_sensitive_actions")]
    pub globally_sensitive_actions: Vec<String>,
    #[serde(default)]
    pub auto_approve_windows: Vec<AutoApprove>,
}

impl Default for Hitl {
    fn default() -> Self {
        Self {
            globally_sensitive_actions: default_sensitive_actions(),
            auto_approve_windows: Vec::new(),
        }
    }
}

fn default_sensitive_actions() -> Vec<String> {
    vec![
        "publish".into(),
        "release".into(),
        "payment".into(),
        "external_email".into(),
        "external_api_post".into(),
        "merge_to_main".into(),
        "dns_change".into(),
        "deploy".into(),
    ]
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AutoApprove {
    pub action: String,
    #[serde(default)]
    pub project: Option<String>,
    #[serde(default)]
    pub agent: Option<String>,
    #[serde(default)]
    pub scope: Option<String>,
    /// RFC 3339 timestamp in UTC.
    pub until: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProjectRef {
    pub file: PathBuf,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct Broker {
    #[serde(default = "default_broker_type")]
    pub r#type: String,
    #[serde(default = "default_mailbox_path")]
    pub path: PathBuf,
}

impl Default for Broker {
    fn default() -> Self {
        Self {
            r#type: default_broker_type(),
            path: default_mailbox_path(),
        }
    }
}

fn default_broker_type() -> String {
    "sqlite".into()
}

fn default_mailbox_path() -> PathBuf {
    PathBuf::from("state/mailbox.db")
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct SupervisorCfg {
    #[serde(default = "default_supervisor_type")]
    pub r#type: String,
    #[serde(default = "default_tmux_prefix")]
    pub tmux_prefix: String,
}

impl Default for SupervisorCfg {
    fn default() -> Self {
        Self {
            r#type: default_supervisor_type(),
            tmux_prefix: default_tmux_prefix(),
        }
    }
}

fn default_supervisor_type() -> String {
    "tmux".into()
}

fn default_tmux_prefix() -> String {
    "a-".into()
}

/// Per-project file, e.g. `projects/hello.yaml`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Project {
    pub version: u32,
    pub project: ProjectMeta,

    #[serde(default)]
    pub channels: Vec<Channel>,

    #[serde(default)]
    pub managers: BTreeMap<String, Agent>,

    #[serde(default)]
    pub workers: BTreeMap<String, Agent>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProjectMeta {
    pub id: String,
    pub name: String,
    pub cwd: PathBuf,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Channel {
    pub name: String,
    /// Either a list of agent ids or the literal string `"*"`.
    #[serde(default)]
    pub members: ChannelMembers,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
pub enum ChannelMembers {
    All(String),
    Explicit(Vec<String>),
}

impl Default for ChannelMembers {
    fn default() -> Self {
        Self::Explicit(Vec::new())
    }
}

impl ChannelMembers {
    pub fn includes(&self, agent: &str, all_agents: &[&str]) -> bool {
        match self {
            ChannelMembers::All(s) if s == "*" => all_agents.contains(&agent),
            ChannelMembers::Explicit(v) => v.iter().any(|a| a == agent),
            _ => false,
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Agent {
    #[serde(default = "default_runtime")]
    pub runtime: String,
    pub model: Option<String>,
    pub role_prompt: Option<PathBuf>,
    #[serde(default)]
    pub permission_mode: Option<String>,
    #[serde(default)]
    pub telegram_inbox: bool,
    #[serde(default)]
    pub reports_to_user: bool,
    #[serde(default = "default_autonomy")]
    pub autonomy: String,
    #[serde(default)]
    pub can_dm: Vec<String>,
    #[serde(default)]
    pub can_broadcast: Vec<String>,
    #[serde(default)]
    pub reports_to: Option<String>,

    /// Override the global rate-limit hook chain for this agent.
    #[serde(default)]
    pub on_rate_limit: Option<Vec<String>>,
}

fn default_runtime() -> String {
    "claude-code".into()
}

fn default_autonomy() -> String {
    "low_risk_only".into()
}

/// Fully loaded compose tree: global + resolved projects.
#[derive(Debug, Clone)]
pub struct Compose {
    pub root: PathBuf,
    pub global: Global,
    pub projects: Vec<Project>,
}

impl Compose {
    /// Walk up from `start` looking for the nearest `.team/team-compose.yaml`,
    /// then fall back to a flat `team-compose.yaml` in `start` itself. Returns
    /// the directory containing the compose file (the "root"), suitable for
    /// passing to [`Compose::load`].
    ///
    /// This is the equivalent of git's `.git/` discovery — once a repo carries
    /// a `.team/` folder, every `teamctl` subcommand finds it from anywhere
    /// inside the tree.
    pub fn discover(start: &Path) -> anyhow::Result<PathBuf> {
        let start = start
            .canonicalize()
            .map_err(|e| anyhow::anyhow!("canonicalize {}: {e}", start.display()))?;
        // 1. Walk up looking for .team/team-compose.yaml.
        let mut cur: Option<&Path> = Some(&start);
        while let Some(dir) = cur {
            let candidate = dir.join(".team").join("team-compose.yaml");
            if candidate.is_file() {
                return Ok(dir.join(".team"));
            }
            cur = dir.parent();
        }
        // 2. Flat layout in `start`.
        if start.join("team-compose.yaml").is_file() {
            return Ok(start);
        }
        // 3. Walk up for a flat layout (legacy convenience).
        let mut cur: Option<&Path> = start.parent();
        while let Some(dir) = cur {
            if dir.join("team-compose.yaml").is_file() {
                eprintln!(
                    "warning: using legacy flat layout at {}; consider migrating to {}",
                    dir.display(),
                    dir.join(".team").display()
                );
                return Ok(dir.to_path_buf());
            }
            cur = dir.parent();
        }
        Err(anyhow::anyhow!(
            "no `.team/team-compose.yaml` found in {} or any parent",
            start.display()
        ))
    }

    /// Parse `team-compose.yaml` at `root` and every referenced project file.
    pub fn load(root: impl AsRef<Path>) -> anyhow::Result<Self> {
        let root = root.as_ref().to_path_buf();
        let global_path = root.join("team-compose.yaml");
        let global: Global = serde_yaml::from_str(
            &std::fs::read_to_string(&global_path)
                .map_err(|e| anyhow::anyhow!("read {}: {e}", global_path.display()))?,
        )
        .map_err(|e| anyhow::anyhow!("parse {}: {e}", global_path.display()))?;

        let mut projects = Vec::with_capacity(global.projects.len());
        for r in &global.projects {
            let p = root.join(&r.file);
            let parsed: Project = serde_yaml::from_str(
                &std::fs::read_to_string(&p)
                    .map_err(|e| anyhow::anyhow!("read {}: {e}", p.display()))?,
            )
            .map_err(|e| anyhow::anyhow!("parse {}: {e}", p.display()))?;
            projects.push(parsed);
        }

        Ok(Self {
            root,
            global,
            projects,
        })
    }

    /// Return every agent in the compose tree tagged with manager/worker.
    pub fn agents(&self) -> impl Iterator<Item = AgentHandle<'_>> {
        self.projects.iter().flat_map(|p| {
            p.managers
                .iter()
                .map(move |(id, a)| AgentHandle {
                    project: &p.project.id,
                    agent: id,
                    spec: a,
                    is_manager: true,
                })
                .chain(p.workers.iter().map(move |(id, a)| AgentHandle {
                    project: &p.project.id,
                    agent: id,
                    spec: a,
                    is_manager: false,
                }))
        })
    }
}

#[derive(Debug, Clone, Copy)]
pub struct AgentHandle<'a> {
    pub project: &'a str,
    pub agent: &'a str,
    pub spec: &'a Agent,
    pub is_manager: bool,
}

impl AgentHandle<'_> {
    /// Canonical id as `<project>:<agent>`.
    pub fn id(&self) -> String {
        format!("{}:{}", self.project, self.agent)
    }
}

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

    #[test]
    fn channel_members_all_expands() {
        let all = ChannelMembers::All("*".into());
        assert!(all.includes("dev1", &["dev1", "dev2"]));
        assert!(!all.includes("ghost", &["dev1", "dev2"]));
    }

    #[test]
    fn channel_members_explicit_checks_list() {
        let exp = ChannelMembers::Explicit(vec!["dev1".into(), "critic".into()]);
        assert!(exp.includes("dev1", &[]));
        assert!(!exp.includes("dev2", &[]));
    }

    #[test]
    fn agent_defaults_are_stable() {
        let a: Agent = serde_yaml::from_str("model: claude-opus-4-7\n").unwrap();
        assert_eq!(a.runtime, "claude-code");
        assert_eq!(a.autonomy, "low_risk_only");
        assert!(!a.telegram_inbox);
    }

    #[test]
    fn discover_prefers_dot_team() {
        let tmp = tempfile::tempdir().unwrap();
        let repo = tmp.path();
        std::fs::create_dir_all(repo.join(".team")).unwrap();
        std::fs::write(repo.join(".team/team-compose.yaml"), "version: 2\n").unwrap();
        // a stray flat-layout file in the same dir should NOT be preferred.
        std::fs::write(repo.join("team-compose.yaml"), "version: 2\n").unwrap();

        // Walking up from a sub-dir should still find the .team/ root.
        let sub = repo.join("src/deep/nested");
        std::fs::create_dir_all(&sub).unwrap();
        let found = Compose::discover(&sub).unwrap();
        assert_eq!(found, repo.canonicalize().unwrap().join(".team"));
    }

    #[test]
    fn discover_falls_back_to_flat_layout() {
        let tmp = tempfile::tempdir().unwrap();
        std::fs::write(tmp.path().join("team-compose.yaml"), "version: 2\n").unwrap();
        let found = Compose::discover(tmp.path()).unwrap();
        assert_eq!(found, tmp.path().canonicalize().unwrap());
    }

    #[test]
    fn discover_errors_when_nothing_found() {
        let tmp = tempfile::tempdir().unwrap();
        let err = Compose::discover(tmp.path()).unwrap_err();
        assert!(err.to_string().contains("no `.team/team-compose.yaml`"));
    }
}
