use agent_client_protocol::ToolKind;
use agent_settings::AgentSettings;
use anyhow::{Context as _, Result, anyhow};
use futures::FutureExt as _;
use gpui::{App, Entity, SharedString, Task};
use project::Project;
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use settings::Settings;
use std::sync::Arc;
use util::markdown::MarkdownInlineCode;

use crate::{
    AgentTool, ToolCallEventStream, ToolPermissionDecision, decide_permission_from_settings,
};

/// Creates a new directory at the specified path within the project. Returns confirmation that the directory was created.
///
/// This tool creates a directory and all necessary parent directories. It should be used whenever you need to create new directories within the project.
#[derive(Debug, Serialize, Deserialize, JsonSchema)]
pub struct CreateDirectoryToolInput {
    /// The path of the new directory.
    ///
    /// <example>
    /// If the project has the following structure:
    ///
    /// - directory1/
    /// - directory2/
    ///
    /// You can create a new directory by providing a path of "directory1/new_directory"
    /// </example>
    pub path: String,
}

pub struct CreateDirectoryTool {
    project: Entity<Project>,
}

impl CreateDirectoryTool {
    pub fn new(project: Entity<Project>) -> Self {
        Self { project }
    }
}

impl AgentTool for CreateDirectoryTool {
    type Input = CreateDirectoryToolInput;
    type Output = String;

    fn name() -> &'static str {
        "create_directory"
    }

    fn kind() -> ToolKind {
        ToolKind::Read
    }

    fn initial_title(
        &self,
        input: Result<Self::Input, serde_json::Value>,
        _cx: &mut App,
    ) -> SharedString {
        if let Ok(input) = input {
            format!("Create directory {}", MarkdownInlineCode(&input.path)).into()
        } else {
            "Create directory".into()
        }
    }

    fn run(
        self: Arc<Self>,
        input: Self::Input,
        event_stream: ToolCallEventStream,
        cx: &mut App,
    ) -> Task<Result<Self::Output>> {
        let settings = AgentSettings::get_global(cx);
        let decision = decide_permission_from_settings(Self::name(), &input.path, settings);

        let authorize = match decision {
            ToolPermissionDecision::Allow => None,
            ToolPermissionDecision::Deny(reason) => {
                return Task::ready(Err(anyhow!("{}", reason)));
            }
            ToolPermissionDecision::Confirm => {
                let context = crate::ToolPermissionContext {
                    tool_name: "create_directory".to_string(),
                    input_value: input.path.clone(),
                };
                Some(event_stream.authorize(
                    format!("Create directory {}", MarkdownInlineCode(&input.path)),
                    context,
                    cx,
                ))
            }
        };

        let project_path = match self.project.read(cx).find_project_path(&input.path, cx) {
            Some(project_path) => project_path,
            None => {
                return Task::ready(Err(anyhow!("Path to create was outside the project")));
            }
        };
        let destination_path: Arc<str> = input.path.as_str().into();

        let create_entry = self.project.update(cx, |project, cx| {
            project.create_entry(project_path.clone(), true, cx)
        });

        cx.spawn(async move |_cx| {
            if let Some(authorize) = authorize {
                authorize.await?;
            }

            futures::select! {
                result = create_entry.fuse() => {
                    result.with_context(|| format!("Creating directory {destination_path}"))?;
                }
                _ = event_stream.cancelled_by_user().fuse() => {
                    anyhow::bail!("Create directory cancelled by user");
                }
            }

            Ok(format!("Created directory {destination_path}"))
        })
    }
}