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//! The main handle to an IR instance.
//!
//! [`Context`] contains several
//! [generational_arena](https://github.com/fitzgen/generational-arena) collections to maintain the
//! IR ECS.
//!
//! It is passed around as a mutable reference to many of the Sway-IR APIs.

use generational_arena::Arena;
use rustc_hash::FxHashMap;

use crate::{
    asm::AsmBlockContent, block::BlockContent, function::FunctionContent,
    local_var::LocalVarContent, metadata::Metadatum, module::ModuleContent, module::ModuleIterator,
    value::ValueContent, Type, TypeContent,
};

/// The main IR context handle.
///
/// Every module, function, block and value is stored here.  Some aggregate metadata is also
/// managed by the context.
pub struct Context {
    pub(crate) modules: Arena<ModuleContent>,
    pub(crate) functions: Arena<FunctionContent>,
    pub(crate) blocks: Arena<BlockContent>,
    pub(crate) values: Arena<ValueContent>,
    pub(crate) local_vars: Arena<LocalVarContent>,
    pub(crate) types: Arena<TypeContent>,
    pub(crate) type_map: FxHashMap<TypeContent, Type>,
    pub(crate) asm_blocks: Arena<AsmBlockContent>,
    pub(crate) metadata: Arena<Metadatum>,

    next_unique_sym_tag: u64,
}

impl Default for Context {
    fn default() -> Self {
        let mut def = Self {
            modules: Default::default(),
            functions: Default::default(),
            blocks: Default::default(),
            values: Default::default(),
            local_vars: Default::default(),
            types: Default::default(),
            type_map: Default::default(),
            asm_blocks: Default::default(),
            metadata: Default::default(),
            next_unique_sym_tag: Default::default(),
        };
        Type::create_basic_types(&mut def);
        def
    }
}

impl Context {
    /// Return an interator for every module in this context.
    pub fn module_iter(&self) -> ModuleIterator {
        ModuleIterator::new(self)
    }

    /// Get a globally unique symbol.
    ///
    /// The name will be in the form `"anon_N"`, where `N` is an incrementing decimal.
    pub fn get_unique_name(&mut self) -> String {
        format!("anon_{}", self.get_unique_id())
    }

    /// Get a globally unique symbol id.
    pub fn get_unique_id(&mut self) -> u64 {
        let sym = self.next_unique_sym_tag;
        self.next_unique_sym_tag += 1;
        sym
    }
}

use std::fmt::{Display, Error, Formatter};

impl Display for Context {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
        write!(f, "{}", crate::printer::to_string(self))
    }
}

impl From<Context> for String {
    fn from(context: Context) -> Self {
        crate::printer::to_string(&context)
    }
}