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use std::{rc::Rc, sync::Arc};

use crate::expr::annotate_type;
use crate::{context::Context, expr::Expr, module::Module};

use super::io::{read_string, write, writeln};
use super::seq::array_count;
use super::{
    arithmetic::{
        add_float, add_int, cos_float, div_float, mul_float, mul_int, powi_float, sin_float,
        sub_float, sub_int,
    },
    eq::{eq, gt, lt},
    seq::array_join,
    string::{char_uppercased, format, string_chars, string_constructor_from_chars},
};

pub fn setup_std_prelude(context: &mut Context) {
    let module = Module::new("prelude", context.top_scope.clone());

    let scope = &module.scope;

    // num

    // #todo forget the mangling, implement with a dispatcher function, multi-function.
    scope.insert(
        "+",
        annotate_type(Expr::ForeignFunc(Arc::new(add_int)), "Int"),
    );
    scope.insert(
        "+$$Int$$Int",
        annotate_type(Expr::ForeignFunc(Arc::new(add_int)), "Int"),
    );
    scope.insert(
        "+$$Float$$Float",
        // #todo add the proper type: (Func Float Float Float)
        // #todo even better: (Func (Many Float) Float)
        annotate_type(Expr::ForeignFunc(Arc::new(add_float)), "Float"),
    );
    scope.insert("-", Expr::ForeignFunc(Arc::new(sub_int)));
    scope.insert(
        "-$$Int$$Int",
        annotate_type(Expr::ForeignFunc(Arc::new(sub_int)), "Int"),
    );
    scope.insert(
        "-$$Float$$Float",
        annotate_type(Expr::ForeignFunc(Arc::new(sub_float)), "Float"),
    );
    scope.insert("*", Expr::ForeignFunc(Arc::new(mul_int)));
    scope.insert(
        "*$$Int$$Int",
        annotate_type(Expr::ForeignFunc(Arc::new(mul_int)), "Int"),
    );
    scope.insert(
        "*$$Float$$Float",
        // #todo add the proper type: (Func Float Float Float)
        // #todo even better: (Func (Many Float) Float)
        annotate_type(Expr::ForeignFunc(Arc::new(mul_float)), "Float"),
    );
    scope.insert(
        "/",
        annotate_type(Expr::ForeignFunc(Arc::new(div_float)), "Float"),
    );
    // #todo ultra-hack
    scope.insert(
        "/$$Float$$Float",
        annotate_type(Expr::ForeignFunc(Arc::new(div_float)), "Float"),
    );
    // #todo ultra-hack
    scope.insert(
        "/$$Float$$Float$$Float",
        annotate_type(Expr::ForeignFunc(Arc::new(div_float)), "Float"),
    );
    scope.insert(
        "sin",
        annotate_type(Expr::ForeignFunc(Arc::new(sin_float)), "Float"),
    );
    scope.insert(
        "cos",
        annotate_type(Expr::ForeignFunc(Arc::new(cos_float)), "Float"),
    );
    scope.insert(
        "**",
        annotate_type(Expr::ForeignFunc(Arc::new(powi_float)), "Float"),
    );

    // eq

    scope.insert("=", Expr::ForeignFunc(Arc::new(eq)));
    scope.insert(">", Expr::ForeignFunc(Arc::new(gt)));
    scope.insert("<", Expr::ForeignFunc(Arc::new(lt)));

    // io

    // #todo grab those from /std/io module

    scope.insert("read", Expr::ForeignFunc(Arc::new(read_string)));
    scope.insert("read$$String", Expr::ForeignFunc(Arc::new(read_string)));

    scope.insert("write", Expr::ForeignFunc(Arc::new(write)));
    scope.insert("write$$String", Expr::ForeignFunc(Arc::new(write)));

    scope.insert("writeln", Expr::ForeignFunc(Arc::new(writeln)));
    scope.insert("writeln$$String", Expr::ForeignFunc(Arc::new(writeln)));

    // seq

    scope.insert("join", Expr::ForeignFunc(Arc::new(array_join)));
    scope.insert("count", Expr::ForeignFunc(Arc::new(array_count)));

    // string

    scope.insert(
        "String",
        Expr::ForeignFunc(Arc::new(string_constructor_from_chars)),
    );
    // env.insert("String$$Array", Expr::ForeignFunc(Arc::new(string_constructor_from_chars)));

    scope.insert("chars", Expr::ForeignFunc(Arc::new(string_chars)));
    scope.insert("chars$$String", Expr::ForeignFunc(Arc::new(string_chars)));

    scope.insert("uppercased", Expr::ForeignFunc(Arc::new(char_uppercased)));
    scope.insert(
        "uppercases$$Char",
        Expr::ForeignFunc(Arc::new(char_uppercased)),
    );

    scope.insert("format", Expr::ForeignFunc(Arc::new(format)));

    // #todo this is a hack.
    let module_path = format!("{}/std/prelude", context.root_path);
    // #todo introduce a helper for this.
    context.module_registry.insert(module_path, Rc::new(module));
}