// Back - An extremely simple git issue tracking system. Inspired by tvix's
// panettone
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This file is part of Back.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/agpl.txt>.

use std::{fmt::Display, io, path::PathBuf};

use thiserror::Error;

use crate::web::prefix::BackPrefix;

pub type Result<T> = std::result::Result<T, Error>;

pub mod responder;

#[derive(Error, Debug)]
pub enum Error {
    ConfigParse {
        file: PathBuf,
        error: serde_json::Error,
    },
    ConfigRead {
        file: PathBuf,
        error: io::Error,
    },
    RocketLaunch(#[from] rocket::Error),

    RepoOpen {
        repository_path: PathBuf,
        error: Box<gix::open::Error>,
    },
    RepoRefsIter(#[from] gix::refs::packed::buffer::open::Error),
    RepoRefsPrefixed(#[from] std::io::Error),

    IssuesPrefixMissing {
        prefix: BackPrefix,
    },
    IssuesPrefixParse(#[from] gix::hash::prefix::from_hex::Error),
}

impl Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::ConfigParse { file, error } => {
                write!(
                    f,
                    "while trying to parse the config file ({}): {error}",
                    file.display()
                )
            }
            Error::ConfigRead { file, error } => {
                write!(
                    f,
                    "while trying to read the config file ({}): {error}",
                    file.display()
                )
            }
            Error::RocketLaunch(error) => {
                write!(f, "while trying to start back: {error}")
            }
            Error::RepoOpen {
                repository_path,
                error,
            } => {
                write!(
                    f,
                    "while trying to open the repository ({}): {error}",
                    repository_path.display()
                )
            }
            Error::RepoRefsIter(error) => {
                write!(f, "while iteration over the refs in a repository: {error}",)
            }
            Error::RepoRefsPrefixed(error) => {
                write!(f, "while prefixing the refs with a path: {error}")
            }
            Error::IssuesPrefixMissing { prefix } => {
                write!(
                    f,
                    "There is no 'issue' associated with the prefix: {prefix}"
                )
            }
            Error::IssuesPrefixParse(error) => {
                write!(f, "The given prefix can not be parsed as prefix: {error}")
            }
        }
    }
}