use log::{info, warn};
use rog_aura::AuraModeNum;
use serde_derive::{Deserialize, Serialize};
use std::fs::OpenOptions;
use std::io::Read;

pub const ASUS_LED_MODE_CONF: &str = "/etc/asusd/asusd-ledmodes.toml";
pub const ASUS_KEYBOARD_DEVICES: [&str; 4] = ["1866", "1869", "1854", "19b6"];

pub fn print_board_info() {
    let dmi = sysfs_class::DmiId::default();
    let board_name = dmi.board_name().expect("Could not get board_name");
    let prod_family = dmi.product_family().expect("Could not get product_family");

    info!("Product family: {}", prod_family.trim());
    info!("Board name: {}", board_name.trim());
}

pub fn print_modes(supported_modes: &[u8]) {
    if !supported_modes.is_empty() {
        info!("Supported Keyboard LED modes are:");
        for mode in supported_modes {
            let mode = <&str>::from(&<AuraModeNum>::from(*mode));
            info!("- {}", mode);
        }
        info!(
            "If these modes are incorrect you can edit {}",
            ASUS_LED_MODE_CONF
        );
    } else {
        info!("No RGB control available");
    }
}

#[derive(Debug, Deserialize, Serialize)]
struct LedSupportFile {
    led_data: Vec<LaptopLedData>,
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct LaptopLedData {
    pub prod_family: String,
    pub board_names: Vec<String>,
    pub standard: Vec<AuraModeNum>,
    pub multizone: bool,
    pub per_key: bool,
}

impl LaptopLedData {
    pub fn get_data() -> Self {
        let dmi = sysfs_class::DmiId::default();
        let board_name = dmi.board_name().expect("Could not get board_name");
        let prod_family = dmi.product_family().expect("Could not get product_family");

        if let Some(modes) = LedSupportFile::load_from_config() {
            if let Some(data) = modes.matcher(&prod_family, &board_name) {
                return data;
            }
        }
        info!("Using generic LED control for keyboard brightness only");
        LaptopLedData {
            prod_family,
            board_names: vec![board_name],
            standard: vec![],
            multizone: false,
            per_key: false,
        }
    }
}

impl LedSupportFile {
    /// Consumes the LEDModes
    fn matcher(self, prod_family: &str, board_name: &str) -> Option<LaptopLedData> {
        for config in self.led_data {
            if prod_family.contains(&config.prod_family) {
                for board in &config.board_names {
                    if board_name.contains(board) {
                        info!("Matched to {} {}", config.prod_family, board);
                        return Some(config);
                    }
                }
            }
        }
        None
    }

    fn load_from_config() -> Option<Self> {
        if let Ok(mut file) = OpenOptions::new().read(true).open(&ASUS_LED_MODE_CONF) {
            let mut buf = String::new();
            if let Ok(l) = file.read_to_string(&mut buf) {
                if l == 0 {
                    warn!("{} is empty", ASUS_LED_MODE_CONF);
                } else {
                    return Some(toml::from_str(&buf).unwrap_or_else(|_| {
                        panic!("Could not deserialise {}", ASUS_LED_MODE_CONF)
                    }));
                }
            }
        }
        warn!("Does {} exist?", ASUS_LED_MODE_CONF);
        None
    }
}