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// Copyright © 2021 HQS Quantum Simulations GmbH. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing permissions and
// limitations under the License.

#![deny(missing_docs)]
#![deny(missing_crate_level_docs)]
#![deny(missing_debug_implementations)]

//! Qoqo quantum computing toolkit
//!
//! Quantum Operation Quantum Operation
//! Yes we use [reduplication](https://en.wikipedia.org/wiki/Reduplication)

use pyo3::prelude::*;
use pyo3::types::PyDict;
use pyo3::wrap_pymodule;

pub mod operations;
use operations::*;

pub mod measurements;
use measurements::*;

mod circuit;
pub use circuit::{convert_into_circuit, CircuitWrapper, OperationIteratorWrapper};

/// qoqo version information, used for qoqo import/export checks
pub const QOQO_VERSION: &str = env!("CARGO_PKG_VERSION");

use roqoqo::{RoqoqoBackendError, RoqoqoError};
use thiserror::Error;

/// Errors that can occur in qoqo.
#[derive(Error, Debug, PartialEq)]
pub enum QoqoError {
    /// Error an Operation cannot be extracted from PyAny object passed from python.
    #[error("Converting PyAny to Operation not possible")]
    ConversionError,
    /// Error a Circuit cannot be extracted from PyAny object passed from python.
    #[error("Cannot extract Circuit from python object")]
    CannotExtractCircuit,
    /// Error for version mismatch between separately compiled packages.
    ///
    /// Error when trying to extract a Circuit from a PyAny python object that has been created
    /// from a python package that has been compiled separately.
    /// To avoid unexpected behaviour this is only allowed when qoqo and roqoqo in both packages are the same version.
    #[error("Package versions of qoqo and roqoqo do not match versions of qoqo object passed from python")]
    VersionMismatch,
    /// Transparent forwarding of roqoqo errors.
    #[error(transparent)]
    RoqoqoError(#[from] RoqoqoError),
}

/// Errors that can occur in qoqo backends.
#[derive(Error, Debug, PartialEq)]
pub enum QoqoBackendError {
    /// Error a Circuit cannot be extracted from PyAny object passed from python.
    #[error("Cannot extract rust object from python object")]
    CannotExtractObject,
    /// Error for version mismatch between separately compiled packages.
    ///
    /// Error when trying to extract a Backend or Device from a PyAny python object that has been created
    /// from a python package that has been compiled separately.
    /// To avoid unexpected behaviour this is only allowed when qoqo and roqoqo in both packages are the same version.
    #[error("Package versions of qoqo backend and roqoqo backend do not match versions of qoqo object passed from python")]
    VersionMismatch,
    /// Transparent forwarding of roqoqo errors.
    #[error(transparent)]
    RoqoqoBackendError(#[from] RoqoqoBackendError),
}

/// Quantum Operation Quantum Operation (qoqo)
///
/// Yes, we use reduplication.
///
/// qoqo is the HQS python package to represent quantum circuits.
///
/// .. autosummary::
///     :toctree: generated/
///
///     Circuit
///     operations
///     measurements
///
#[pymodule]
fn qoqo(_py: Python, module: &PyModule) -> PyResult<()> {
    module.add_class::<CircuitWrapper>()?;
    let wrapper = wrap_pymodule!(operations);
    module.add_wrapped(wrapper)?;
    let wrapper2 = wrap_pymodule!(measurements);
    module.add_wrapped(wrapper2)?;

    // Adding nice imports corresponding to maturin example
    let system = PyModule::import(_py, "sys")?;
    let system_modules: &PyDict = system.getattr("modules")?.downcast()?;
    system_modules.set_item("qoqo.operations", module.getattr("operations")?)?;
    system_modules.set_item("qoqo.measurements", module.getattr("measurements")?)?;
    Ok(())
}