use std::cell::OnceCell;
use std::error::Error;

use clap::builder::Str;
use colored::Colorize;

use nom::Err;
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);

        // 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 {
            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 send_room_message(&mut self, room_id: &str, text: &str) -> Result<Value, Box<dyn Error>> {
        let content = HashMap::from([("msgtype", "m.text"), ("body", text)]);
        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());
        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(&long_message, &self.room_id_for_long_messages.clone())?;
        self.send_room_message(&short_message, &self.room_id_for_short_messages.clone())?;
        Ok(())
    }
}