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use std::collections::HashMap;
use std::fs;
use std::path::{PathBuf};
use json::{JsonValue, object};

#[derive(Clone, Debug)]
pub struct Config {
    pub default: String,
    pub connections: HashMap<String, Connection>,
}

impl Config {
    pub fn default() -> Config {
        let mut connections = HashMap::new();
        connections.insert("mydbname".to_string(), Connection::default());
        Self {
            default: "mydbname".to_string(),
            connections,
        }
    }
    pub fn json(&mut self) -> JsonValue {
        let mut data = object! {};
        data["default"] = self.default.clone().into();
        let mut connections = object! {};
        for (name, connection) in self.connections.iter_mut() {
            connections[name.clone()] = connection.json().clone();
        }
        data["connections"] = connections;
        data
    }
    pub fn from(data: JsonValue) -> Config {
        let default = data["default"].to_string();
        let mut connections = HashMap::new();
        for (key, value) in data["connections"].entries() {
            let connection = Connection::default().from(value.clone()).clone();
            connections.insert(key.to_string(), connection.clone());
        }
        Self {
            default,
            connections,
        }
    }
}

#[derive(Clone, Debug)]
pub enum Mode {
    Mysql,
    Mssql,
    Sqlite,
}

impl Mode {
    pub fn str(&mut self) -> &'static str {
        match self {
            Mode::Mysql => "mysql",
            Mode::Sqlite => "sqlite",
            Mode::Mssql => "mssql"
        }
    }
    pub fn from(name: &str) -> Self {
        match name {
            "mysql" => Mode::Mysql,
            "sqlite" => Mode::Sqlite,
            "mssql" => Mode::Mssql,
            _ => Mode::Sqlite
        }
    }
}

#[derive(Clone, Debug)]
pub struct Connection {
    pub mode: Mode,
    pub hostname: String,
    pub hostport: String,
    pub database: String,
    pub username: String,
    pub userpass: String,
    pub params: Vec<String>,
    pub charset: String,
    pub prefix: String,
    pub debug: bool,
}

impl Connection {
    pub fn default() -> Connection {
        Self {
            mode: Mode::Sqlite,
            hostname: "".to_string(),
            hostport: "".to_string(),
            database: "db/sqlite.db".to_string(),
            username: "".to_string(),
            userpass: "".to_string(),
            params: vec![],
            charset: "".to_string(),
            prefix: "".to_string(),
            debug: false,
        }
    }
    pub fn json(&mut self) -> JsonValue {
        let res = format!("{:?}", self);
        let res = res.replace("Connection {", "{");
        let res = res.replace("Sqlite", format!("\"{}\"", self.mode.str()).as_str());
        let res = res.replace("Mysql", format!("\"{}\"", self.mode.str()).as_str());
        let res = res.replace("Mssql", format!("\"{}\"", self.mode.str()).as_str());
        let res = res.replace(",},", "}");
        let res = res.replace(": ", "\": ");
        let res = res.replace("{ ", "{ \"");
        let res = res.replace(", ", ", \"");
        json::parse(&*res).unwrap()
    }
    pub fn from(&mut self, data: JsonValue) -> &mut Connection {
        self.mode = Mode::from(data["mode"].as_str().unwrap());
        self.hostname = data["hostname"].to_string();
        self.hostport = data["hostport"].to_string();
        self.database = data["database"].to_string();
        self.username = data["username"].to_string();
        self.userpass = data["userpass"].to_string();
        self.params = data["params"].members().map(|x| x.to_string()).collect();
        self.charset = data["charset"].as_str().unwrap_or("utf8mb4").to_string();
        self.prefix = data["prefix"].as_str().unwrap_or("").to_string();
        self.debug = data["debug"].to_string().parse::<bool>().unwrap_or(false).into();
        self
    }
    pub fn get_dsn(self) -> String {
        match self.mode {
            Mode::Mysql => {
                format!("mysql://{}:{}@{}:{}/{}", self.username, self.userpass, self.hostname, self.hostport, self.database)
            }
            Mode::Sqlite => {
                let db_path = self.database.as_str();
                let path_buf = PathBuf::from(db_path);
                if !path_buf.is_file() {
                    fs::create_dir_all(db_path.trim_end_matches(path_buf.file_name().unwrap().to_str().unwrap())).unwrap();
                }
                format!("{}", path_buf.to_str().unwrap())
            }
            Mode::Mssql => format!("sqlsrv://{}:{}@{}:{}/{}", self.username, self.userpass, self.hostname, self.hostport, self.database),
        }
    }
}