//! Tool trait, execution context, and the registry of all built-in tools.
//!
//! This module defines the core `Tool` trait that every agent-invocable tool
//! must implement, the shared `ToolCtx` execution context passed to every tool
//! invocation, and utility functions for path resolution, command execution,
//! argument extraction, and edit-log persistence.

use crate::utils::CastOr;
use anyhow::Result;
use serde_json::Value;
use sha2::Digest;
use std::path::PathBuf;
use std::sync::atomic::AtomicBool;
use std::sync::{Arc, Mutex};

pub mod bash_tools;
pub mod fs;
pub mod git;
pub mod lsp;
pub mod memory;
pub mod plan;
pub mod search;
pub mod sequential_think;
pub mod shell;
pub mod shell_filter;
pub mod spawn;
pub mod utility;
pub mod workflow;

pub use git::git_cred;
pub use git::git_operator;
pub use git::git_worktree;

/// Common interface every agent-invocable tool implements.
pub trait Tool: Send + Sync {
    fn name(&self) -> &'static str;
    fn description(&self) -> &'static str;
    fn parameters(&self) -> Value;
    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String>;
}

/// A project-defined rule that flags a matching file path or content pattern
/// for review.
#[derive(Debug, Clone)]
pub struct GraduatedCheck {
    pub name: String,
    pub pattern: String,
    pub rule: String,
}

/// Shared execution context passed to every `Tool::run` call: workspace roots,
/// session paths, cached directory state, and workflow-level findings sharing.
#[derive(Clone)]
pub struct ToolCtx {
    pub workspaces: Vec<PathBuf>,
    pub session_dir: PathBuf,
    pub memory_dir: PathBuf,
    pub worktrees_dir: PathBuf,
    pub dir_cache: Arc<tokio::sync::RwLock<crate::DirCache>>,
    pub mention_index: crate::MentionIndex,
    pub origin: crate::Origin,
    pub graduated_checks: Vec<GraduatedCheck>,
    pub lsp_manager: Arc<Mutex<crate::lsp::manager::LspManager>>,
    pub turn_events:
        Option<Arc<Mutex<std::collections::VecDeque<crate::TurnEvent>>>>,
    pub workflow_findings: Option<Arc<Mutex<Vec<String>>>>,
    pub abort_flag: Option<Arc<AtomicBool>>,
}

impl ToolCtx {
    pub fn builder() -> ToolCtxBuilder {
        ToolCtxBuilder::default()
    }
}

/// Builder for `ToolCtx`; fields default to empty paths and a fresh `DirCache`.
#[derive(Clone)]
pub struct ToolCtxBuilder {
    pub workspaces: Vec<PathBuf>,
    pub session_dir: PathBuf,
    pub memory_dir: PathBuf,
    pub worktrees_dir: PathBuf,
    pub dir_cache: Arc<tokio::sync::RwLock<crate::DirCache>>,
    pub mention_index: crate::MentionIndex,
    pub origin: crate::Origin,
    pub graduated_checks: Vec<GraduatedCheck>,
    pub lsp_manager: Arc<Mutex<crate::lsp::manager::LspManager>>,
    pub turn_events:
        Option<Arc<Mutex<std::collections::VecDeque<crate::TurnEvent>>>>,
    pub workflow_findings: Option<Arc<Mutex<Vec<String>>>>,
    pub abort_flag: Option<Arc<AtomicBool>>,
}

impl Default for ToolCtxBuilder {
    fn default() -> Self {
        ToolCtxBuilder {
            workspaces: Vec::new(),
            session_dir: PathBuf::new(),
            memory_dir: PathBuf::new(),
            worktrees_dir: PathBuf::new(),
            dir_cache: Arc::new(tokio::sync::RwLock::new(crate::DirCache::new())),
            mention_index: crate::MentionIndex::new(),
            origin: crate::Origin::Main,
            graduated_checks: Vec::new(),
            lsp_manager: Arc::new(Mutex::new(crate::lsp::manager::LspManager::new())),
            turn_events: None,
            workflow_findings: None,
            abort_flag: None,
        }
    }
}

impl ToolCtxBuilder {
    pub fn session_dir(mut self, v: PathBuf) -> Self {
        self.session_dir = v;
        self
    }
    pub fn workspaces(mut self, v: Vec<PathBuf>) -> Self {
        self.workspaces = v;
        self
    }
    pub fn origin(mut self, v: crate::Origin) -> Self {
        self.origin = v;
        self
    }
    pub fn turn_events(
        mut self,
        v: Arc<Mutex<std::collections::VecDeque<crate::TurnEvent>>>,
    ) -> Self {
        self.turn_events = Some(v);
        self
    }
    pub fn workflow_findings(mut self, v: Option<Arc<Mutex<Vec<String>>>>) -> Self {
        self.workflow_findings = v;
        self
    }
    pub fn build(self) -> ToolCtx {
        ToolCtx {
            workspaces: self.workspaces,
            session_dir: self.session_dir,
            memory_dir: self.memory_dir,
            worktrees_dir: self.worktrees_dir,
            dir_cache: self.dir_cache,
            mention_index: self.mention_index,
            origin: self.origin,
            graduated_checks: self.graduated_checks,
            lsp_manager: self.lsp_manager,
            turn_events: self.turn_events,
            workflow_findings: self.workflow_findings,
            abort_flag: self.abort_flag,
        }
    }
}

/// Check which graduated checks apply to a given file path/content pair.
pub fn check_graduated_checks(path: &str, content: &str, checks: &[GraduatedCheck]) -> Vec<String> {
    let mut matches = Vec::new();
    for check in checks {
        if path.contains(&check.pattern) || content.contains(&check.rule) {
            matches.push(check.name.clone());
        }
    }
    matches
}

/// Construct one instance of every built-in tool.
pub fn all_tools() -> Vec<Box<dyn Tool>> {
    vec![
        Box::new(fs::read::Read),
        Box::new(fs::write::Write),
        Box::new(fs::edit::Edit),
        Box::new(fs::delete::Delete),
        Box::new(search::Grep),
        Box::new(search::Glob),
        Box::new(bash_tools::BashOutput),
        Box::new(bash_tools::BashKill),
        Box::new(shell::Bash),
        Box::new(git_operator::GitOperator),
        Box::new(git_worktree::GitWorktree),
        Box::new(git_cred::GitCred),
        Box::new(sequential_think::SeqThink),
        Box::new(plan::PlanEnter),
        Box::new(plan::PlanReady),
        Box::new(workflow::WorkflowRun),
        Box::new(workflow::NoteFinding),
        Box::new(workflow::ReadFindings),
        Box::new(workflow::HiveMind),
        Box::new(spawn::SpawnAgents),
        Box::new(spawn::SpawnPipeline),
        Box::new(memory::remember::Remember),
        Box::new(memory::forget::Forget),
        Box::new(memory::recall::Recall),
        Box::new(utility::cd::Cd),
        Box::new(utility::dir_list::DirList),
        Box::new(utility::dir_cache_update::DirCacheUpdate),
        Box::new(utility::pong::Pong),
        Box::new(utility::todowrite::Todowrite),
        Box::new(utility::todofinish::Todofinish),
        Box::new(lsp::LspConnect),
        Box::new(lsp::LspDiagnostics),
        Box::new(lsp::LspHover),
        Box::new(lsp::LspCompletion),
        Box::new(lsp::LspDefinition),
        Box::new(lsp::LspReferences),
        Box::new(lsp::LspDisconnect),
    ]
}

/// Whether a tool by name can mutate the filesystem or run arbitrary shell commands.
pub fn tool_is_risky(name: &str) -> bool {
    matches!(name, "write" | "delete" | "edit" | "bash" | "git_operator")
}

/// Extract a required string argument from a JSON args map.
pub fn arg_str(args: &Value, name: &str) -> Result<String> {
    args.get(name)
        .and_then(|v| v.as_str())
        .map(std::string::ToString::to_string)
        .ok_or_else(|| anyhow::anyhow!("missing required argument: {name}"))
}

/// Execute a `std::process::Command` and return its combined stdout/stderr.
pub fn execute_cmd(cmd: &mut std::process::Command) -> Result<String> {
    let output = cmd
        .output()
        .map_err(|e| anyhow::anyhow!("command execution failed: {e}"))?;
    let stdout = String::from_utf8_lossy(&output.stdout).trim().to_string();
    let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
    let combined = if stderr.is_empty() {
        stdout
    } else {
        format!("{}\n{}", stdout, stderr)
            .trim()
            .to_string()
    };
    if output.status.success() {
        Ok(combined)
    } else {
        let code = output.status.code().unwrap_or(-1);
        anyhow::bail!("command failed with exit code {code}:\n{combined}")
    }
}

/// Resolve a tool-supplied relative path to an absolute path within a workspace
/// root, rejecting escapes.
pub fn resolve_path(workspaces: &[PathBuf], rel: &str) -> Result<PathBuf> {
    let (ws_idx, path) = if rel.starts_with('[') {
        let close = rel
            .find(']')
            .ok_or_else(|| anyhow::anyhow!("invalid workspace prefix"))?;
        let idx: usize = rel[1..close]
            .parse()
            .map_err(|_| anyhow::anyhow!("invalid workspace index"))?;
        (idx, &rel[close + 1..])
    } else {
        (0, rel)
    };
    let base = workspaces
        .get(ws_idx)
        .ok_or_else(|| anyhow::anyhow!("workspace index {ws_idx} out of range"))?;
    let abs = if path.is_empty() {
        base.clone()
    } else {
        base.join(path)
    };
    let canon = if let Ok(c) = abs.canonicalize() {
        c
    } else {
        let base_canon = workspaces
            .iter()
            .find_map(|w| w.canonicalize().ok())
            .unwrap_or_else(|| base.clone());
        let mut resolved = base_canon.clone();
        if let Ok(rel_components) = abs.strip_prefix(&base_canon) {
            for comp in rel_components.components() {
                match comp {
                    std::path::Component::ParentDir => {
                        resolved.pop();
                    }
                    std::path::Component::CurDir => {}
                    c => resolved.push(c),
                }
            }
        }
        resolved
    };
    if workspaces.iter().any(|w| canon.starts_with(w)) {
        Ok(canon)
    } else {
        anyhow::bail!("path '{rel}' is outside all workspace roots")
    }
}

/// After a successful write/edit tool run, compute content hash and byte
/// delta, then persist an `EditLogEntry` to the session's edit log.
pub fn log_write_edit_tool(
    args: &serde_json::Value,
    tool_name: &str,
    origin_tag: &str,
    session_dir: &std::path::Path,
    session_id: &str,
) {
    let reason = args
        .get("reason")
        .and_then(|v| v.as_str())
        .unwrap_or("unnamed");
    let path = args
        .get("path")
        .and_then(|v| v.as_str())
        .unwrap_or("unknown");
    let content = args.get("content").or_else(|| args.get("new"));
    let content_str = content.and_then(|v| v.as_str()).unwrap_or("");
    let content_sha256 = hex::encode(sha2::Sha256::digest(content_str.as_bytes()));
    let bytes_delta = if tool_name == "write" {
        content_str.len().cast_or(0i64)
    } else {
        let old = args.get("old").and_then(|v| v.as_str()).unwrap_or("");
        let new = args.get("new").and_then(|v| v.as_str()).unwrap_or("");
        let new_len: i64 = new.len().cast_or(0i64);
        let old_len: i64 = old.len().cast_or(0i64);
        (new_len - old_len).abs()
    };
    let entry = zesdex_domain::cms::EditLogEntry {
        ts: chrono::Utc::now().timestamp_millis(),
        tool: tool_name.to_string(),
        path: path.to_string(),
        reason: reason.to_string(),
        content_sha256,
        bytes_delta,
        origin: origin_tag.to_string(),
        session_id: session_id.to_string(),
    };
    use zesdex_domain::cms::repository::EditLogRepository;
    let repo = crate::persistence::cms::edit_log_repo::JsonlEditLogRepository::new();
    if let Ok(mut el) = repo.open(session_dir) {
        let _ = repo.append(session_dir, &mut el, entry);
    }
}

/// Convert a list of tools into provider-facing `ToolDef` request schema.
pub fn tool_defs(tools: &[Box<dyn Tool>]) -> Vec<zesdex_domain::core::ToolDef> {
    tools
        .iter()
        .map(|t| zesdex_domain::core::ToolDef {
            type_: "function".to_string(),
            function: zesdex_domain::core::ToolFunctionDef {
                name: t.name().to_string(),
                description: t.description().to_string(),
                parameters: t.parameters(),
            },
        })
        .collect()
}