use std::fs;
use std::path::PathBuf;
use serde_json::{json, Value};
use anyhow::{Result, anyhow};
use super::super::Tool;
use super::super::ToolCtx;
use super::super::resolve_path;
use super::helpers::arg_str;

pub struct Delete;

impl Tool for Delete {
    fn name(&self) -> &'static str {
        "delete"
    }

    fn description(&self) -> &'static str {
        "Delete a file or empty directory. Will not delete non-empty directories."
    }

    fn parameters(&self) -> Value {
        json!({
            "type": "object",
            "properties": {
                "path": {
                    "type": "string",
                    "description": "Path to the file or directory to delete (relative to workspace root)"
                }
            },
            "required": ["path"]
        })
    }

    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
        let rel = arg_str(args, "path")?;
        let path: PathBuf = resolve_path(&ctx.workspaces, &rel)?;

        if !path.exists() {
            return Ok(format!("path '{}' does not exist (resolved to {})", rel, path.display()));
        }

        let metadata = path.metadata()
            .map_err(|e| anyhow!("failed to read metadata for '{}': {}", rel, e))?;

        if metadata.is_dir() {
            let is_empty = fs::read_dir(&path)
                .map_err(|e| anyhow!("failed to read directory '{}': {}", rel, e))?
                .next()
                .is_none();
            if is_empty {
                fs::remove_dir(&path)
                    .map_err(|e| anyhow!("failed to remove directory '{}': {}", rel, e))?;
                Ok(format!("removed empty directory {}", rel))
            } else {
                anyhow::bail!("directory '{}' is not empty (refusing to delete)", rel);
            }
        } else {
            fs::remove_file(&path)
                .map_err(|e| anyhow!("failed to delete '{}': {}", rel, e))?;
            Ok(format!("deleted {}", rel))
        }
    }
}