use std::fmt;

#[derive(Debug)]
pub enum PullError {
    BadRequest(String),
    Unauthorized,
    Forbidden,
    NotFound,
    Conflict(String),
    RateLimited(String),
    Internal(String),
}

impl fmt::Display for PullError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::BadRequest(message) => write!(f, "{message}"),
            Self::Unauthorized => write!(f, "unauthorized"),
            Self::Forbidden => write!(f, "forbidden"),
            Self::NotFound => write!(f, "not found"),
            Self::Conflict(message) => write!(f, "{message}"),
            Self::RateLimited(message) => write!(f, "{message}"),
            Self::Internal(message) => write!(f, "{message}"),
        }
    }
}

impl std::error::Error for PullError {}

auth::auth_error_conversion!(PullError);
api::db_error_conversions!(PullError);
api::json_payload_conversion!(PullError);
api::page_error_conversion!(PullError, BadRequest);
api::domain_error_passthrough!(PullError from issues::errors::IssueError);

impl From<git::facade::GitError> for PullError {
    fn from(error: git::facade::GitError) -> Self {
        use git::facade::GitError as G;
        match error {
            G::InvalidArgument(msg) => Self::BadRequest(msg),
            G::NotFound => Self::NotFound,
            G::Unauthorized => Self::Unauthorized,
            G::Forbidden => Self::Forbidden,
            G::Conflict(msg) => Self::Conflict(msg),
            G::Cache(_) | G::Git(_) | G::Internal(_) | G::Unimplemented(_) => {
                Self::Internal(error.to_string())
            }
        }
    }
}

api::api_error! {
    log: "pulls",
    pub enum ApiError {
        BadRequest(400, "request failed validation"),
        Unauthorized(401, "authentication required"),
        Forbidden(403, "operation not allowed"),
        NotFound(404, "resource not found"),
        Conflict(409, "resource conflict"),
        TooManyRequests(429, "rate limit exceeded"),
        Internal(500, "internal server error"),
    }
}

impl From<PullError> for ApiError {
    fn from(error: PullError) -> Self {
        match error {
            PullError::BadRequest(msg) => Self::bad_request(msg),
            PullError::Unauthorized => Self::unauthorized(),
            PullError::Forbidden => Self::forbidden(),
            PullError::NotFound => Self::not_found("pull request not found"),
            PullError::Conflict(msg) => Self::conflict_with_code("merge_blocked", msg),
            PullError::RateLimited(msg) => Self::rate_limited(msg),
            PullError::Internal(message) => Self::internal(message),
        }
    }
}