use pyo3::import_exception;

use pyo3::{create_exception, PyErr};

use hg::revlog::nodemap::NodeMapError;

use hg::UncheckedRevision;

use crate::revision::PyRevision;

create_exception!(pyo3_rustext, GraphError, PyValueError);

create_exception!(pyo3_rustext, FallbackError, PyRuntimeError);

import_exception!(mercurial.error, WdirUnsupported);

impl GraphError {

    pub fn from_hg(inner: hg::GraphError) -> PyErr {

        match inner {

            hg::GraphError::ParentOutOfRange(r) => {

                GraphError::new_err(("ParentOutOfRange", PyRevision(r.0)))

            }

            hg::GraphError::ParentOutOfOrder(r) => {

                GraphError::new_err(("ParentOutOfOrder", PyRevision(r.0)))

            }

        }

    }

    pub fn from_vcsgraph(inner: vcsgraph::graph::GraphReadError) -> PyErr {

        match inner {

            vcsgraph::graph::GraphReadError::InconsistentGraphData => {

                GraphError::new_err("InconsistentGraphData")

            }

            vcsgraph::graph::GraphReadError::InvalidKey => {

                GraphError::new_err("ParentOutOfRange")

            }

            vcsgraph::graph::GraphReadError::KeyedInvalidKey(r) => {

                GraphError::new_err(("ParentOutOfRange", r))

            }

            vcsgraph::graph::GraphReadError::WorkingDirectoryUnsupported => {

                WdirUnsupported::new_err(())

            }

        }

    }

}

pub fn map_lock_error<T>(e: std::sync::PoisonError<T>) -> PyErr {

    PyRuntimeError::new_err(format!("In Rust PyO3 bindings: {e}"))

}

pub fn map_try_lock_error<T>(e: std::sync::TryLockError<T>) -> PyErr {

    PyRuntimeError::new_err(format!("In Rust PyO3 bindings: {e}"))

}

pub mod mercurial_py_errors {

    pyo3::import_exception!(mercurial.error, RevlogError);

}

pub fn revlog_error_from_msg(e: impl ToString) -> PyErr {

    mercurial_py_errors::RevlogError::new_err(e.to_string().into_bytes())

}

pub fn revlog_error_bare() -> PyErr {

    mercurial_py_errors::RevlogError::new_err((None::<String>,))

}

pub fn rev_not_in_index(rev: UncheckedRevision) -> PyErr {

    PyValueError::new_err(format!("revlog index out of range: {}", rev))

}

pub fn nodemap_error(err: NodeMapError) -> PyErr {

    match err {

        NodeMapError::MultipleResults => {

            mercurial_py_errors::RevlogError::new_err("")

        }

        NodeMapError::RevisionNotInIndex(rev) => {

            PyValueError::new_err(format!(

                "Inconsistency: Revision {} found in nodemap \

             is not in revlog index",

                rev

            ))

        }

    }

}

pub fn graph_error(_err: hg::GraphError) -> PyErr {

    // ParentOutOfRange is currently the only alternative

    // in `hg::GraphError`. The C index always raises this simple ValueError.

    PyValueError::new_err("parent out of range")

}