//! Browser tools for the agent — enables web browsing with anti-detection.
//!
//! These tools are registered with the `ToolExecutor` and provide
//! LLM-accessible functions for searching the web, browsing pages,
//! clicking elements, and extracting content.
//!
//! Uses the camoufox-browser daemon protocol (Unix socket IPC).

use serde_json;
use tracing::info;

use gyandoot_browser::BrowserClient;

use crate::tools::Tool;

/// Search macro name strings sent to the camoufox daemon.
const MACRO_GOOGLE: &str = "@google_search";
const MACRO_YOUTUBE: &str = "@youtube_search";
const MACRO_AMAZON: &str = "@amazon_search";
const MACRO_REDDIT: &str = "@reddit_search";
const MACRO_WIKIPEDIA: &str = "@wikipedia_search";
const MACRO_TWITTER: &str = "@twitter_search";
const MACRO_YELP: &str = "@yelp_search";
const MACRO_SPOTIFY: &str = "@spotify_search";
const MACRO_LINKEDIN: &str = "@linkedin_search";
const MACRO_INSTAGRAM: &str = "@instagram_search";
const MACRO_TIKTOK: &str = "@tiktok_search";
const MACRO_TWITCH: &str = "@twitch_search";

fn site_to_macro(site: &str) -> &'static str {
    match site {
        "google" => MACRO_GOOGLE,
        "youtube" => MACRO_YOUTUBE,
        "amazon" => MACRO_AMAZON,
        "reddit" => MACRO_REDDIT,
        "wikipedia" => MACRO_WIKIPEDIA,
        "twitter" | "x" => MACRO_TWITTER,
        "yelp" => MACRO_YELP,
        "spotify" => MACRO_SPOTIFY,
        "linkedin" => MACRO_LINKEDIN,
        "instagram" => MACRO_INSTAGRAM,
        "tiktok" => MACRO_TIKTOK,
        "twitch" => MACRO_TWITCH,
        _ => MACRO_GOOGLE,
    }
}

fn site_name(site: &str) -> &'static str {
    match site {
        "google" => "Google",
        "youtube" => "YouTube",
        "amazon" => "Amazon",
        "reddit" => "Reddit",
        "wikipedia" => "Wikipedia",
        "twitter" | "x" => "Twitter/X",
        "yelp" => "Yelp",
        "spotify" => "Spotify",
        "linkedin" => "LinkedIn",
        "instagram" => "Instagram",
        "tiktok" => "TikTok",
        "twitch" => "Twitch",
        _ => "Google",
    }
}

/// Tool for searching the web using camoufox daemon macros.
pub struct WebSearchTool {
    client: BrowserClient,
}

impl WebSearchTool {
    pub fn new(client: BrowserClient) -> Self {
        Self { client }
    }
}

#[async_trait::async_trait]
impl Tool for WebSearchTool {
    fn name(&self) -> &str {
        "web_search"
    }

    fn description(&self) -> &str {
        "Search the web using Google, YouTube, Amazon, Reddit, Wikipedia, and more. \
         Uses anti-detection browser to bypass bot protection. \
         Returns an accessibility snapshot of search results."
    }

    fn parameters(&self) -> serde_json::Value {
        serde_json::json!({
            "type": "object",
            "properties": {
                "query": {
                    "type": "string",
                    "description": "The search query"
                },
                "site": {
                    "type": "string",
                    "description": "Site to search. Options: google, youtube, amazon, reddit, wikipedia, twitter, yelp, spotify, linkedin, instagram, tiktok, twitch",
                    "default": "google"
                }
            },
            "required": ["query"]
        })
    }

    async fn execute(&self, args: serde_json::Value) -> anyhow::Result<String> {
        let query = args["query"].as_str().unwrap_or("").to_string();
        let site = args["site"].as_str().unwrap_or("google").to_lowercase();

        if query.is_empty() {
            return Err(anyhow::anyhow!("query is required"));
        }

        let mname = site_to_macro(&site);
        let sname = site_name(&site);

        info!("web_search: searching {} for '{}'", sname, query);

        // Execute search — daemon auto-launches browser on first call
        let result = self.client.search(mname, &query).await
            .map_err(|e| anyhow::anyhow!("Search failed: {}", e))?;

        // Get snapshot of results
        let snap = self.client.snapshot(true).await
            .map_err(|e| anyhow::anyhow!("Failed to get snapshot: {}", e))?;

        let refs = snap.extract_refs();
        let response = format!(
            "## {} Search Results\n\n**Query:** {}\n**Page:** {}\n**Title:** {}\n\n**Snapshot content:**\n{}\n\n**Available element refs:** {:?}\n\n*Use `web_browse` to interact with specific results.*",
            sname,
            query,
            result.url,
            result.title,
            snap.snapshot,
            refs,
        );

        Ok(response)
    }
}

/// Tool for browsing a specific URL using camoufox daemon browser.
pub struct WebBrowseTool {
    client: BrowserClient,
}

impl WebBrowseTool {
    pub fn new(client: BrowserClient) -> Self {
        Self { client }
    }
}

#[async_trait::async_trait]
impl Tool for WebBrowseTool {
    fn name(&self) -> &str {
        "web_browse"
    }

    fn description(&self) -> &str {
        "Browse a specific URL using an anti-detection browser. \
         Returns an accessibility snapshot with element refs for interaction. \
         Supports navigation, clicking, typing, and scrolling."
    }

    fn parameters(&self) -> serde_json::Value {
        serde_json::json!({
            "type": "object",
            "properties": {
                "url": {
                    "type": "string",
                    "description": "The URL to browse"
                },
                "action": {
                    "type": "string",
                    "description": "Action to perform: 'navigate' (default), 'click', 'type', 'scroll', 'back', 'forward', 'refresh'",
                    "default": "navigate"
                },
                "element_ref": {
                    "type": "string",
                    "description": "Element reference (e.g., 'e1', 'e2') — required for click/type actions"
                },
                "text": {
                    "type": "string",
                    "description": "Text to type — required for type action"
                },
                "press_enter": {
                    "type": "boolean",
                    "description": "Press Enter after typing",
                    "default": false
                },
                "direction": {
                    "type": "string",
                    "description": "Scroll direction: 'up' or 'down'",
                    "default": "down"
                },
                "amount": {
                    "type": "integer",
                    "description": "Scroll amount in pixels",
                    "default": 500
                }
            },
            "required": ["url"]
        })
    }

    async fn execute(&self, args: serde_json::Value) -> anyhow::Result<String> {
        let url = args["url"].as_str().unwrap_or("").to_string();
        let action = args["action"].as_str().unwrap_or("navigate").to_lowercase();
        let element_ref = args["element_ref"].as_str().map(|s| s.to_string());
        let text = args["text"].as_str().map(|s| s.to_string());
        let press_enter = args["press_enter"].as_bool().unwrap_or(false);
        let direction = args["direction"].as_str().unwrap_or("down").to_string();
        let amount = args["amount"].as_u64().unwrap_or(500) as u32;

        if url.is_empty() {
            return Err(anyhow::anyhow!("url is required"));
        }

        match action.as_str() {
            "navigate" => {
                self.client.navigate(&url).await
                    .map_err(|e| anyhow::anyhow!("Navigation failed: {}", e))?;
            }
            "click" => {
                let r#ref = element_ref.as_ref()
                    .ok_or_else(|| anyhow::anyhow!("element_ref is required for click action"))?;
                self.client.click(r#ref).await
                    .map_err(|e| anyhow::anyhow!("Click failed: {}", e))?;
            }
            "type" => {
                let r#ref = element_ref.as_ref()
                    .ok_or_else(|| anyhow::anyhow!("element_ref is required for type action"))?;
                let t = text.as_ref()
                    .ok_or_else(|| anyhow::anyhow!("text is required for type action"))?;
                self.client.type_text(r#ref, t, press_enter).await
                    .map_err(|e| anyhow::anyhow!("Type failed: {}", e))?;
            }
            "scroll" => {
                self.client.scroll(&direction, amount).await
                    .map_err(|e| anyhow::anyhow!("Scroll failed: {}", e))?;
            }
            "back" => {
                self.client.go_back().await
                    .map_err(|e| anyhow::anyhow!("Go back failed: {}", e))?;
            }
            "forward" => {
                self.client.go_forward().await
                    .map_err(|e| anyhow::anyhow!("Go forward failed: {}", e))?;
            }
            "refresh" => {
                self.client.refresh().await
                    .map_err(|e| anyhow::anyhow!("Refresh failed: {}", e))?;
            }
            _ => {}
        }

        let snap = self.client.snapshot(false).await
            .map_err(|e| anyhow::anyhow!("Failed to get snapshot: {}", e))?;

        let refs = snap.extract_refs();
        let current_url = if snap.url.is_empty() { &url } else { &snap.url };
        let response = format!(
            "## Page Snapshot\n\n**URL:** {}\n\n**Snapshot:**\n{}\n\n**Element refs:** {:?}\n\n*Use `web_browse` with action=\"click\" and element_ref to interact with elements.*",
            current_url,
            snap.snapshot,
            refs,
        );

        Ok(response)
    }
}

/// Register all browser tools with the given executor.
pub fn register_browser_tools(executor: &mut crate::tools::ToolExecutor, client: BrowserClient) {
    executor.register(Box::new(WebSearchTool::new(client.clone())));
    executor.register(Box::new(WebBrowseTool::new(client)));
    info!("Registered browser tools: web_search, web_browse");
}

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

    #[test]
    fn test_web_search_tool_definition() {
        let client = BrowserClient::new();
        let tool = WebSearchTool::new(client);
        assert_eq!(tool.name(), "web_search");
        let params = tool.parameters();
        assert!(params["required"].as_array().unwrap().contains(&"query".to_string().into()));
    }

    #[test]
    fn test_web_browse_tool_definition() {
        let client = BrowserClient::new();
        let tool = WebBrowseTool::new(client);
        assert_eq!(tool.name(), "web_browse");
        let params = tool.parameters();
        assert!(params["required"].as_array().unwrap().contains(&"url".to_string().into()));
    }

    #[test]
    fn test_site_to_macro() {
        assert_eq!(site_to_macro("google"), "@google_search");
        assert_eq!(site_to_macro("youtube"), "@youtube_search");
        assert_eq!(site_to_macro("reddit"), "@reddit_search");
    }
}