/*
 Cargo KConfig - KConfig parser
 Copyright (C) 2022  Sjoerd van Leent

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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/

mod ast_extra;
mod config_registry;
pub mod dependencies;
pub mod error;
mod eval;
mod hex;
mod item;
#[cfg(test)]
mod tests;
mod variant;

pub use hex::Hex;

pub(crate) use ast_extra::AstExtra;

pub use variant::Variant;
pub use variant::VariantDataType;

use std::{cmp::Ordering, fmt::Display, ops::Not};

pub use config_registry::ConfigRegistry;
pub use error::{Error, LoadError};
pub use item::Item;
use kconfig_parser::{Ast, Symbol};

/// A tristate type is basically a bool wrapped in an option, where
/// None represents 'm', or the 'maybe' state.
#[derive(Clone, Debug, PartialEq, Eq, Copy)]
pub struct Tristate(Option<bool>);

impl Default for Tristate {
    fn default() -> Self {
        Tristate::FALSE
    }
}

impl PartialOrd for Tristate {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.int_comp(other))
    }
}

impl Ord for Tristate {
    fn cmp(&self, other: &Self) -> Ordering {
        self.int_comp(other)
    }
}

impl Not for Tristate {
    type Output = Tristate;

    fn not(self) -> Self::Output {
        match self {
            Tristate::TRUE => Tristate::FALSE,
            Tristate::FALSE => Tristate::TRUE,
            Tristate::MAYBE => Tristate::MAYBE,
        }
    }
}

impl Display for Tristate {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match *self {
            Tristate::TRUE => f.write_str(&format!("{}", true)),
            Tristate::FALSE => f.write_str(&format!("{}", false)),
            Tristate::MAYBE => f.write_str("maybe"),
        }
    }
}

impl From<&str> for Tristate {
    fn from(v: &str) -> Self {
        match v {
            "n" | "N" => Tristate::FALSE,
            "y" | "Y" => Tristate::TRUE,
            _ => Tristate::MAYBE,
        }
    }
}

impl From<bool> for Tristate {
    fn from(b: bool) -> Self {
        match b {
            true => Tristate::TRUE,
            false => Tristate::FALSE,
        }
    }
}

impl Tristate {
    pub const MAYBE: Self = Self(None);
    pub const TRUE: Self = Self(Some(true));
    pub const FALSE: Self = Self(Some(false));

    fn int_comp(&self, other: &Self) -> Ordering {
        match (self, other) {
            (&Self::TRUE, &Self::TRUE)
            | (&Self::MAYBE, &Self::MAYBE)
            | (&Self::FALSE, &Self::FALSE) => std::cmp::Ordering::Equal,
            (&Self::TRUE, &Self::MAYBE)
            | (&Self::TRUE, &Self::FALSE)
            | (&Self::MAYBE, &Self::FALSE) => std::cmp::Ordering::Greater,
            _ => std::cmp::Ordering::Less,
        }
    }
}

/// Determines the type, and name of a given menu item. This can either be
/// - A Configuration Item (Config)
/// - A Regular Menu (Menu)
/// - A Menu Configuration Item, which is a hybrid of the former two (MenuConfig)
/// If a Menu is defined, the name of the menu will be the full name, if any
/// of the other two are defined, it will be the configuration name which is
/// typically also used in the .config file.
#[derive(Hash, PartialEq, Eq, Clone, Debug, PartialOrd, Ord)]
pub enum ItemReference {
    Config(String),
    Menu(String),
    MenuConfig(String),
}

impl Default for ItemReference {
    fn default() -> Self {
        ItemReference::Config("".to_owned())
    }
}

/// Converts a menu item descriptor directly into the representation
/// of the name of the menu item.
impl Display for ItemReference {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(match self {
            ItemReference::Config(s) | ItemReference::Menu(s) | ItemReference::MenuConfig(s) => s,
        })
    }
}

/// Descriptor information contains the "help" text of a menu item.
/// (where applicable). It also contains a item reference, to be able to lookup
/// the originating item.
#[derive(Clone, Debug, Default, PartialEq, Eq)]
pub struct Info {
    text: Vec<String>,
    origin: ItemReference,
}

impl Info {
    /// Creates the descriptor information for the given item reference
    pub(crate) fn new(text: Vec<String>, origin: ItemReference) -> Self {
        Self { text, origin }
    }

    /// Returns wether the given help text is empty, and perhaps not relevant
    pub fn is_empty(&self) -> bool {
        self.text.is_empty()
    }

    /// Returns the origin item reference belonging to the information
    pub fn origin(&self) -> ItemReference {
        self.origin.clone()
    }

    /// Returns an iterator over the text
    pub fn iter(&self) -> Box<dyn Iterator<Item = String>> {
        Box::new(self.text.clone().into_iter())
    }
}

#[derive(Clone, PartialEq, Eq, Debug)]
pub enum MutationStart {
    String(String),
    Hex(Hex),
    Int(i64),
    Bool(bool),
    Tristate(Tristate),
    None,
}

impl From<Variant> for MutationStart {
    fn from(value: Variant) -> Self {
        match value.datatype() {
            VariantDataType::Bool => MutationStart::Bool(value.into()),
            VariantDataType::Hex => MutationStart::Hex(value.into()),
            VariantDataType::Int => MutationStart::Int(value.into()),
            VariantDataType::String => MutationStart::String(value.into()),
            VariantDataType::Tristate => MutationStart::Tristate(value.into()),
        }
    }
}