use std::path::{Path, PathBuf};

use clap::{Parser, ValueEnum};

/// The configuration for the app.
pub struct AppConfig {
    /// The resolver for the app.
    resolver: AppResolver,
    /// The path to the resistor dataset file.
    resistor_dataset: PathBuf,
    /// The path to the capacitor dataset file.
    capacitor_dataset: PathBuf,
    /// The path to the inductor dataset file.
    inductor_dataset: PathBuf,
}

impl AppConfig {
    /// Get the resolver.
    pub fn get_resolver(&self) -> &AppResolver {
        &self.resolver
    }
    /// Get the path to the resistor dataset file.
    pub fn get_resistor_dataset(&self) -> &Path {
        &self.resistor_dataset
    }
    /// Get the path to the capacitor dataset file.
    pub fn get_capacitor_dataset(&self) -> &Path {
        &self.capacitor_dataset
    }
    /// Get the path to the inductor dataset file.
    pub fn get_inductor_dataset(&self) -> &Path {
        &self.inductor_dataset
    }
}

/// The resolver for the app.
#[derive(Debug, Clone, ValueEnum)]
pub enum AppResolver {
    /// The look-up table resolver.
    #[value(name = "lut")]
    Lut,
    /// The BFS resolver.
    #[value(name = "bfs")]
    Bfs,
}

/// Get the resistor, capacitor, or inductor circuit which has the closest value
/// for your given value within at most 3 devices.
#[derive(Parser)]
#[command(
    name = "LCR Connector",
    version,
    about = "Get the resistor, capacitor, or inductor circuit which has the closest value for your given value within at most 3 devices."
)]
struct Cli {
    /// The resolver you want to use.
    #[arg(short = 's', long = "resolver", required = true, value_enum)]
    resolver: AppResolver,

    /// The path to the resistor dataset file.
    #[arg(
        short = 'r',
        long = "resistor",
        required = true,
        value_name = "RESISTOR.TXT"
    )]
    resistor_dataset: PathBuf,

    /// The path to the inductor dataset file.
    #[arg(
        short = 'l',
        long = "inductor",
        required = true,
        value_name = "INDUCTOR.TXT"
    )]
    inductor_dataset: PathBuf,

    /// The path to the capacitor dataset file.
    #[arg(
        short = 'c',
        long = "capacitor",
        required = true,
        value_name = "CAPACITOR.TXT"
    )]
    capacitor_dataset: PathBuf,
}

impl From<Cli> for AppConfig {
    fn from(args: Cli) -> Self {
        Self {
            resolver: args.resolver,
            resistor_dataset: args.resistor_dataset,
            capacitor_dataset: args.capacitor_dataset,
            inductor_dataset: args.inductor_dataset,
        }
    }
}

pub fn parse_args() -> AppConfig {
    let args = Cli::parse();
    let config = AppConfig::from(args);
    config
}