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use fmt::Formatter;
use std::collections::BTreeSet;
use std::fmt;

use id_arena::Arena;

use crate::core::{
    function::{Function, FunctionId, ReturnType},
    target_datalayout::TargetDataLayout,
    target_triple::TargetTriple,
};

/// An representation of LLVMModule.
#[allow(dead_code)]
pub struct Module {
    target_triple: Option<TargetTriple>,

    target_datalayout: Option<TargetDataLayout>,

    function_arena: Arena<Function>,
    functions: BTreeSet<FunctionId>,
}

impl fmt::Display for Module {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        if let Some(layout) = &self.target_datalayout {
            writeln!(f, "target datalayout = \"{}\"", layout)?;
        }
        if let Some(target_triple) = &self.target_triple {
            writeln!(f, "target triple = \"{}\"", target_triple)?;
        }

        for func_id in self.functions.iter() {
            let func = self.function_arena.get(*func_id).unwrap();

            writeln!(f, "{}", func)?;
        }

        Ok(())
    }
}

impl Module {
    pub fn set_target_triple(&mut self, triple: TargetTriple) {
        self.target_triple = Some(triple);
    }

    pub fn set_target_datalayout(&mut self, layout: TargetDataLayout) {
        self.target_datalayout = Some(layout);
    }

    pub fn get_function_ref_as_mut(&mut self, func_id: FunctionId) -> &mut Function {
        self.function_arena.get_mut(func_id).unwrap()
    }

    pub fn get_function_ref(&self, func_id: FunctionId) -> &Function {
        self.function_arena.get(func_id).unwrap()
    }

    pub fn new_function(&mut self, func_name: &str, ret_type: ReturnType) -> FunctionId {
        let func_id = self
            .function_arena
            .alloc(Function::new(func_name, ret_type));

        assert!(self.functions.insert(func_id));

        func_id
    }
}

impl Default for Module {
    fn default() -> Self {
        Self {
            target_triple: None,
            target_datalayout: None,

            function_arena: Arena::new(),
            functions: BTreeSet::new(),
        }
    }
}