use r2d2::PooledConnection;
use r2d2_sqlite::{SqliteConnectionManager, rusqlite::Statement};
use rocket::{serde::{json::{Json, serde_json::json}, Deserialize, Serialize}, State};

use crate::{utils::{ApiResponse, get_error_message}, Action, ASender};
use crate::DBPool;

#[derive(Debug, Deserialize, Serialize, Clone)]
#[serde(crate = "rocket::serde")]
#[serde(rename_all = "camelCase")]
pub struct LightConfiguration {
    ledcount: u32,
    direction_x: u32,
    direction_y: u32,
    direction_z: u32,
    tags: Option<String>
}

#[derive(Debug, Deserialize, Serialize, Clone)]
#[serde(crate = "rocket::serde")]
#[serde(rename_all = "camelCase")]
pub struct LightConfigurationRequest {
    lights: Vec<LightConfiguration>
}

#[post("/configure", data= "<data>")]
pub async fn configure(data: Json<LightConfigurationRequest>, db: &State<DBPool>, action: &State<ASender<Action>>) -> String {
    let conn = get_conn(db);
    if let Err(e) = conn {
        return e;
    }
    let conn = conn.unwrap();

    let recreate = is_configured(&conn);
    if let Err(e) = recreate {
        return e;
    }
    let recreate = recreate.unwrap();

    if recreate {
        let stmt = conn.execute("DELETE FROM configuration;", ());
        if stmt.is_err() || stmt.as_ref().ok().is_none() {
            return json!(ApiResponse {code: 500, message: format!("Clould not configure. Err: 4, {:?}", stmt)}).to_string();
        }
    }

    for light in data.lights.iter() {
        
        let mut tags: String = "".to_string();

        if light.tags.is_some() {
            tags = light.tags.as_ref().unwrap().to_string()
        }

        let stmt = conn.execute(
            "INSERT INTO configuration (ledcount, directionX, directionY, directionZ, tags) VALUES (?1, ?2, ?3, ?4, ?5);", 
            (light.ledcount, light.direction_x, light.direction_y, light.direction_z, tags));

        if stmt.is_err() || stmt.as_ref().ok().is_none() {
            return json!(ApiResponse {code: 500, message: format!("Clould not configure. Err: 5, {:?}", stmt)}).to_string();
        }
    }

    let send = action.lock().unwrap().send(Action::Reload);

    if send.is_err() || send.ok().is_none() {
        return json!(ApiResponse {code: 500, message: "Failed to reload".to_string()}).to_string()
    }

    let stmt = conn.execute("UPDATE meta set configured=1 where id=1;", ());
    if stmt.is_err() || stmt.as_ref().ok().is_none() {
        return json!(ApiResponse {code: 500, message: format!("Clould not configure. Err: 5, {:?}", stmt)}).to_string();
    }
    
    json!(ApiResponse {code: 200, message: "Configuration was successful".to_string()}).to_string()
}

type Conn = PooledConnection<SqliteConnectionManager>;

fn get_conn(db: &State<DBPool>) -> Result<Conn, String> {
    let conn = db.get();
    if let Ok(conn) = conn {
        return Ok(conn);
    }
    Err(json!(ApiResponse {code: 500, message: "Clould not conncect to the db.".to_string()}).to_string())
}

fn prepare_statement<'a>(conn: &'a Conn, stat: &str) -> Result<Statement<'a>, String> {
    let stmt = conn.prepare(stat);
    if stmt.is_err() || stmt.as_ref().ok().is_none() {
        println!("stmt: {}", stat);
        return Err(get_error_message("Could not construct statetment"));
    }
    let stmt: Statement<'a> = stmt.unwrap();
    return Ok(stmt);
}

fn is_configured(conn: &Conn) -> Result<bool, String> {
    let mut stmt = prepare_statement(conn, "SELECT configured from meta;")?;

    
    #[derive(Debug)]
    struct Data {
        configured: u32,
    }

    let version_iter = stmt.query_map([], |row| {
        Ok(Data {
            configured: row.get(0)?
        })
    });

    if version_iter.is_err() || version_iter.as_ref().ok().is_none() {
        return Err(json!(ApiResponse {code: 500, message: "Clould not get data of db".to_string()}).to_string());
    }

    let version_iter = version_iter.ok().unwrap();

    for data in version_iter {
        let data = data.unwrap();
        if data.configured == 1 {
            return Ok(true);
        }
    }
    return Ok(false);
}

#[get("/configure")]
pub async fn get_configure(db: &State<DBPool>) -> String {
    let conn = get_conn(db);
    if let Err(e) = conn {
        return e;
    }
    let conn = conn.unwrap();

    let configured = is_configured(&conn);
    if let Err(e) = configured {
        return e;
    }
    let configured = configured.unwrap();

    if !configured {
        return get_error_message("Not yet configured");
    }

    let stmt = prepare_statement(&conn, "SELECT id, ledcount, directionX, directionY, directionZ, tags from configuration;");
    if let Err(e) = stmt {
        return e;
    }
    let mut stmt = stmt.unwrap();

    #[derive(Deserialize, Serialize)]
    #[serde(crate = "rocket::serde")]
    #[serde(rename_all = "camelCase")]
    struct Data {
        id: u32,
        ledcount: u32,
        direction_x: u32,
        direction_y: u32,
        direction_z: u32,
        tags: String,
    }

    let configuration = stmt.query_map([], |row| {
        Ok(Data {
            id: row.get(0)?,
            ledcount: row.get(1)?,
            direction_x: row.get(2)?,
            direction_y: row.get(3)?,
            direction_z: row.get(4)?,
            tags: row.get(5)?,
        })
    });

    if configuration.is_err() || configuration.as_ref().ok().is_none() {
        return json!(ApiResponse {code: 500, message: "Clould not get data of db".to_string()}).to_string();
    }

    let configuration = configuration.unwrap();

    let data: Vec<Data> = configuration.into_iter().map(|data| {
        return data.unwrap();
    }).collect();

    json!(data).to_string()
}