use std::{path::PathBuf, sync::OnceLock};

use serde::{Deserialize, Serialize};

use crate::types::Coords;

pub(super) static CONFIG_PATH: OnceLock<PathBuf> = OnceLock::new();
static CONFIG: OnceLock<Config> = OnceLock::new();

pub fn access_config<'a>() -> &'a Config {
    CONFIG.get_or_init(|| {
        serde_json::from_str(&std::fs::read_to_string(CONFIG_PATH.get().unwrap()).unwrap()).unwrap()
    })
}

#[derive(Serialize, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct Config {
    pub charge_rate_update_interval_seconds: u64,
    pub tesla_update_interval_seconds: u64,
    pub tesla_update_interval_while_charging_seconds: u64,
    pub pl_watch_interval_seconds: u64,
    pub pl_timeout_milliseconds: u64,
    pub coords: Coords,
    pub serial_port: String,
    pub baud_rate: u32,
    pub shutoff_voltage: f64,
    pub shutoff_voltage_time_seconds: u64,
    pub min_rate: i64,
    pub max_rate: i64,
    pub duty_cycle_too_high: f64,
    pub duty_cycle_too_low: f64,
    pub optional_string: Option<String>,
}

impl Default for Config {
    fn default() -> Self {
        Self {
            charge_rate_update_interval_seconds: 30,
            tesla_update_interval_seconds: 120,
            tesla_update_interval_while_charging_seconds: 5,
            pl_watch_interval_seconds: 30,
            pl_timeout_milliseconds: 250,
            coords: Coords {
                latitude: 0.,
                longitude: 0.,
            },
            serial_port: String::from("/dev/ttyUSB0"),
            baud_rate: 9600,
            shutoff_voltage: 52.,
            shutoff_voltage_time_seconds: 15,
            min_rate: 5,
            max_rate: 10,
            duty_cycle_too_high: 0.9,
            duty_cycle_too_low: 0.7,
            optional_string: None,
        }
    }
}