// Copyright (C) 2019-2020 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The Leo library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.

pub mod address;
pub mod array;
pub mod boolean;
pub mod circuits;
pub mod console;
pub mod definition;
// pub mod field;
pub mod function;
// pub mod group;
pub mod import;
pub mod input_files;
pub mod integers;
pub mod mutability;
pub mod statements;
pub mod syntax;
pub mod tuples;

use leo_compiler::{
    compiler::Compiler,
    errors::CompilerError,
    group::targets::edwards_bls12::EdwardsGroupType,
    ConstrainedValue,
    OutputBytes,
};
use leo_input::types::{IntegerType, U32Type, UnsignedIntegerType};
use leo_typed::{InputValue, MainInput};

use snarkos_curves::edwards_bls12::Fq;
use snarkos_models::gadgets::r1cs::TestConstraintSystem;

use std::path::PathBuf;

pub const TEST_OUTPUT_DIRECTORY: &str = "/output/";
const EMPTY_FILE: &str = "";

pub type EdwardsTestCompiler = Compiler<Fq, EdwardsGroupType>;
pub type EdwardsConstrainedValue = ConstrainedValue<Fq, EdwardsGroupType>;

fn new_compiler() -> EdwardsTestCompiler {
    let program_name = "test".to_string();
    let path = PathBuf::from("/test/src/main.leo");
    let output_dir = PathBuf::from(TEST_OUTPUT_DIRECTORY);

    EdwardsTestCompiler::new(program_name, path, output_dir)
}

pub(crate) fn parse_program(bytes: &[u8]) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();
    let program_string = String::from_utf8_lossy(bytes);

    compiler.parse_program_from_string(&program_string)?;

    Ok(compiler)
}

pub(crate) fn parse_input(bytes: &[u8]) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();
    let input_string = String::from_utf8_lossy(bytes);
    let path = PathBuf::new();

    compiler.parse_input(&input_string, path.clone(), EMPTY_FILE, path)?;

    Ok(compiler)
}

pub(crate) fn parse_state(bytes: &[u8]) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();
    let state_string = String::from_utf8_lossy(bytes);
    let path = PathBuf::new();

    compiler.parse_input(EMPTY_FILE, path.clone(), &state_string, path)?;

    Ok(compiler)
}

pub(crate) fn parse_input_and_state(
    input_bytes: &[u8],
    state_bytes: &[u8],
) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();
    let input_string = String::from_utf8_lossy(input_bytes);
    let state_string = String::from_utf8_lossy(state_bytes);
    let path = PathBuf::new();

    compiler.parse_input(&input_string, path.clone(), &state_string, path)?;

    Ok(compiler)
}

pub fn parse_program_with_input(
    program_bytes: &[u8],
    input_bytes: &[u8],
) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();

    let program_string = String::from_utf8_lossy(program_bytes);
    let input_string = String::from_utf8_lossy(input_bytes);
    let path = PathBuf::new();

    compiler.parse_input(&input_string, path.clone(), EMPTY_FILE, path)?;
    compiler.parse_program_from_string(&program_string)?;

    Ok(compiler)
}

pub fn parse_program_with_state(
    program_bytes: &[u8],
    state_bytes: &[u8],
) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();

    let program_string = String::from_utf8_lossy(program_bytes);
    let state_string = String::from_utf8_lossy(state_bytes);
    let path = PathBuf::new();

    compiler.parse_input(EMPTY_FILE, path.clone(), &state_string, path)?;
    compiler.parse_program_from_string(&program_string)?;

    Ok(compiler)
}

pub fn parse_program_with_input_and_state(
    program_bytes: &[u8],
    input_bytes: &[u8],
    state_bytes: &[u8],
) -> Result<EdwardsTestCompiler, CompilerError> {
    let mut compiler = new_compiler();

    let program_string = String::from_utf8_lossy(program_bytes);
    let input_string = String::from_utf8_lossy(input_bytes);
    let state_string = String::from_utf8_lossy(state_bytes);
    let path = PathBuf::new();

    compiler.parse_input(&input_string, path.clone(), &state_string, path)?;
    compiler.parse_program_from_string(&program_string)?;

    Ok(compiler)
}

pub(crate) fn get_output(program: EdwardsTestCompiler) -> OutputBytes {
    // synthesize the circuit on the test constraint system
    let mut cs = TestConstraintSystem::<Fq>::new();
    let output = program.generate_constraints_helper(&mut cs).unwrap();

    // assert the constraint system is satisfied
    assert!(cs.is_satisfied());

    output
}

pub(crate) fn assert_satisfied(program: EdwardsTestCompiler) {
    let empty_output_bytes = include_bytes!("compiler_output/empty.out");
    let res = get_output(program);

    // assert that the output is empty
    assert_eq!(empty_output_bytes, res.bytes().as_slice());
}

pub(crate) fn expect_compiler_error(program: EdwardsTestCompiler) -> CompilerError {
    let mut cs = TestConstraintSystem::<Fq>::new();
    program.generate_constraints_helper(&mut cs).unwrap_err()
}

// pub(crate) fn expect_synthesis_error(program: EdwardsTestCompiler) {
//     let mut cs = TestConstraintSystem::<Fq>::new();
//     let _output = program.generate_constraints_helper(&mut cs).unwrap();
//
//     assert!(!cs.is_satisfied());
// }

pub(crate) fn generate_main_input(input: Vec<(&str, Option<InputValue>)>) -> MainInput {
    let mut main_input = MainInput::new();

    for (name, value) in input {
        main_input.insert(name.to_string(), value);
    }

    main_input
}

pub(crate) fn generate_test_input_u32(number: u32) -> Option<InputValue> {
    Some(InputValue::Integer(
        IntegerType::Unsigned(UnsignedIntegerType::U32Type(U32Type {})),
        number.to_string(),
    ))
}