use std::error::Error;
use std::io::Read;

use colored::Colorize;
use regex::Regex;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::{SystemTime, UNIX_EPOCH};

use reqwest::blocking::Client;
use serde_json::{json, Value};

use crate::config_spec::{CfgField, CfgGroup};
use crate::{trace_var, verboseln};

pub const CONFIG: CfgGroup<'static> = CfgGroup {
    name: "matrix",
    description: "API Settings for matrix",
    fields: &[
        CfgField::Default {
            key: "homeserver-url",
            default: "https://matrix-client.matrix.org",
            description: "Homeserver where the bot logs in.",
        },
        CfgField::Default {
            key: "user-id",
            default: "@bot_username:matrix.org",
            description: "API Username associated with the bot account used for writing messages.",
        },
        CfgField::Password {
            key: "access-token",
            description: "Access Token / \"password\" used for authenticating as the bot.",
        },
        CfgField::Default {
            key: "room-id-for-long-messages",
            default: "!someLongRoomIdentifier:matrix.org",
            description: "API Username associated with the bot account used for writing messages.",
        },
        CfgField::Default {
            key: "room-id-for-short-messages",
            default: "!someLongRoomIdentifier:matrix.org",
            description: "API Username associated with the bot account used for writing messages.",
        },
    ],
};

pub struct MatrixClient {
    homeserver_url: String,
    user_id: String,
    access_token: String,
    is_dry_run: bool,
    client: Client,
    txn_id: u64,
    room_id_for_short_messages: String,
    room_id_for_long_messages: String,
}

#[derive(Serialize, Deserialize, Debug)]
struct LoginRequest {
    user: String,
    password: String,
    #[serde(rename = "type")]
    login_type: String,
}

#[derive(Serialize, Deserialize, Debug)]
struct LoginResponse {
    access_token: String,
}

impl std::fmt::Debug for MatrixClient {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("matrix")
            .field("homeserver_url", &self.homeserver_url)
            .field("user_id", &self.user_id)
            .field("access_token", &"*****")
            .field("is_dry_run", &self.is_dry_run)
            .field("client", &self.client)
            .finish()
    }
}

impl MatrixClient {
    pub fn new(
        homeserver_url: &str, user_id: &str, access_token: &str, room_id_for_short_messages: &str,
        room_id_for_long_messages: &str, is_dry_run: bool,
    ) -> Self {
        Self {
            homeserver_url: homeserver_url.to_string(),
            user_id: user_id.to_string(),
            access_token: access_token.to_string(),
            is_dry_run,
            client: Client::builder().cookie_store(true).build().unwrap(),
            txn_id: SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
            room_id_for_long_messages: room_id_for_long_messages.to_string(),
            room_id_for_short_messages: room_id_for_short_messages.to_string(),
        }
    }
    fn request<T: Serialize>(
        &self, method: reqwest::Method, endpoint: &str,
        query_data: Option<&HashMap<String, String>>, json_data: Option<&T>, unauth: bool,
    ) -> Result<Value, Box<dyn Error>> {
        let client = reqwest::blocking::Client::new();
        let url = format!("{}/_matrix/client{}", self.homeserver_url, endpoint);
        print!("url: {}", url.yellow());

        // Construct URL with query parameters
        let mut request = client.request(method, &url);
        if let Some(params) = query_data {
            request = request.query(params);
        }

        // Add JSON body if provided
        if let Some(data) = json_data {
            request = request.json(data);
        }

        // Add authorization header if not unauthenticated request
        if !unauth {
            request = request.header("Authorization", format!("Bearer {}", self.access_token));
        }

        let response = request.send()?;

        if response.status().is_success() {
            Ok(response.json()?)
        } else {
            // println!("These were the parameters: {}", params);
            Err(format!("Request failed: {}", response.status()).into())
        }
    }

    fn put<T: Serialize>(
        &self, endpoint: &str, query_data: Option<&HashMap<String, String>>, json_data: Option<&T>,
        unauth: bool,
    ) -> Result<Value, Box<dyn Error>> {
        self.request(reqwest::Method::PUT, endpoint, query_data, json_data, unauth)
    }

    fn post<T: Serialize>(
        &self, endpoint: &str, query_data: Option<&HashMap<String, String>>, json_data: Option<&T>,
        unauth: bool,
    ) -> Result<Value, Box<dyn Error>> {
        self.request(reqwest::Method::POST, endpoint, query_data, json_data, unauth)
    }

    // fn get(
    //     &self, endpoint: &str, query_data: Option<&HashMap<String, String>>, unauth: bool,
    // ) -> Result<Value, Box<dyn Error>> {
    //     self.request::<HashMap<String, String>>(
    //         reqwest::Method::GET,
    //         endpoint,
    //         query_data,
    //         None,
    //         unauth,
    //     )
    // }

    pub fn login(&mut self, username: &str, password: &str) -> Result<(), Box<dyn Error>> {
        let login_request = LoginRequest {
            user: username.to_string(),
            password: password.to_string(),
            login_type: "m.login.password".to_string(),
        };

        let response: LoginResponse =
            serde_json::from_value(self.post("/r0/login", None, Some(&login_request), true)?)?;

        self.access_token = response.access_token;
        Ok(())
    }

    fn txn_id(&mut self) -> u64 {
        let current = self.txn_id;
        self.txn_id += 1;
        current
    }

    pub fn pandoc_convert_md_to_html(markdown: String) -> Result<String, Box<dyn Error>> {
        let (output, errors, status) = crate::pipe(
            "pandoc",
            &mut [
                "--from", "markdown-auto_identifiers",
                "--to", "html5",
                "--wrap=none",  // Verhindert Zeilenumbrüche
                "--no-highlight", // Deaktiviert Syntax-Highlighting
            ],
            markdown,
        )?;
        if status.success() {
            println!("Resultat von Pandoc: {}", output);
            Ok(output)
        } else {
            Err(format!("Pandoc error, exit code {:?}\n{}", status, errors).into())
        }
    }

    pub fn format_matrix_html(markdown: String) -> Result<String, Box<dyn Error>> {
        let mut html = Self::pandoc_convert_md_to_html(markdown)?;
        
        let url_regex = Regex::new(r"(https?://[^\s<]+)")?;
        html = url_regex.replace_all(&html, r#"<a href="$1">$1</a>"#).to_string();
        
        html = html.replace("\n\n", "</p><p>");
        html = html.replace("\n", "<br>");
        
        html = html.replace("**", "<strong>");
        html = html.replace("__", "<strong>");
        
        Ok(html)
    }

    pub fn pandoc_convert_text_to_md(markdown: String) -> Result<String, Box<dyn Error>> {
        let (output, errors, status) = crate::pipe(
            "pandoc",
            &mut ["--from", "markdown-auto_identifiers", "--to", "html5"],
            markdown,
        )?;
        if status.success() {
            println!("Resultat von Pandoc: {}", output);
            Ok(output)
        } else {
            Err(format!("Pandoc error, exit code {:?}\n{}", status, errors).into())
        }
    }

    pub fn send_room_message(
        &mut self, room_id: &str, text: &str,
    ) -> Result<Value, Box<dyn Error>> {
        let formatted_text = Self::format_matrix_html(text.to_string())?;
        let content = HashMap::from([
            ("type", "m.room.message"),
            ("msgtype", "m.text"),
            ("body", text),
            ("format", "org.matrix.custom.html"),
            ("formatted_body", &formatted_text),
            ("m.mentions", "{}"),
            ]);
        self.send_room_event(&room_id, "m.room.message", &content)
    }

    fn send_room_event(
        &mut self, room: &str, event_type: &str, content: &impl Serialize,
    ) -> Result<Value, Box<dyn Error>> {
        let endpoint = format!("/r0/rooms/{}/send/{}/{}", room, event_type, self.txn_id());
        println!("room event:{}", &endpoint.red());
        self.put(&endpoint, None, Some(content), false)
    }
    pub fn send_short_and_long_messages_to_two_rooms(
        &mut self, short_message: &str, long_message: &str,
    ) -> Result<(), Box<dyn Error>> {
        self.send_room_message( &self.room_id_for_long_messages.clone(), &long_message,)?;
        self.send_room_message( &self.room_id_for_short_messages.clone(), &short_message,)?;
        Ok(())
    }

}