// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use serde::{Serialize, Serializer};
use thiserror::Error;

/// All errors that can occur while running the updater.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum Error {
    /// Endpoints are not sent.
    #[error("Updater does not have any endpoints set.")]
    EmptyEndpoints,
    /// IO errors.
    #[error(transparent)]
    Io(#[from] std::io::Error),
    /// Semver errors.
    #[error(transparent)]
    Semver(#[from] semver::Error),
    /// Serialization errors.
    #[error(transparent)]
    Serialization(#[from] serde_json::Error),
    /// Could not fetch a valid response from the server.
    #[error("Could not fetch a valid release JSON from the remote")]
    ReleaseNotFound,
    /// Unsupported app architecture.
    #[error(
        "Unsupported application architecture, expected one of `x86`, `x86_64`, `arm` or `aarch64`."
    )]
    UnsupportedArch,
    /// Operating system is not supported.
    #[error("Unsupported OS, expected one of `linux`, `darwin` or `windows`.")]
    UnsupportedOs,
    /// Failed to determine updater package extract path
    #[error("Failed to determine updater package extract path.")]
    FailedToDetermineExtractPath,
    /// Url parsing errors.
    #[error(transparent)]
    UrlParse(#[from] url::ParseError),
    /// `reqwest` crate errors.
    #[error(transparent)]
    Reqwest(#[from] reqwest::Error),
    /// The platform was not found in the updater JSON response.
    #[error("the platform `{0}` was not found in the response `platforms` object")]
    TargetNotFound(String),
    /// Neither the platform nor the fallback platform was found in the updater JSON response.
    #[error("None of the fallback platforms `{0:?}` were found in the response `platforms` object")]
    TargetsNotFound(Vec<String>),
    /// Download failed
    #[error("`{0}`")]
    Network(String),
    /// `minisign_verify` errors.
    #[error(transparent)]
    Minisign(#[from] minisign_verify::Error),
    /// `base64` errors.
    #[error(transparent)]
    Base64(#[from] base64::DecodeError),
    /// UTF8 Errors in signature.
    #[error(
        "The signature {0} could not be decoded, please check if it is a valid base64 string. The signature must be the contents of the `.sig` file generated by the Tauri bundler, as a string."
    )]
    SignatureUtf8(String),
    #[cfg(all(target_os = "windows", feature = "zip"))]
    /// `zip` errors.
    #[error(transparent)]
    Extract(#[from] zip::result::ZipError),
    /// No temp dir could be created on the same mount point as the app, which the updater needs
    /// to move the app aside and the update into place with renames.
    #[error("temp directory is not on the same mount point as the app")]
    TempDirNotOnSameMountPoint,
    /// Installing the update failed, and the app it was replacing could not be moved back to its
    /// install path either. The previous app was kept at the given path instead.
    #[error("failed to install the update and to restore the previous app, which was left at {0}")]
    PreviousAppNotRestored(std::path::PathBuf),
    /// The downloaded archive does not contain a binary for the current target.
    #[error("binary for the current target not found in the archive")]
    BinaryNotFoundInArchive,
    /// Could not create a temporary directory to store the downloaded update.
    #[error("failed to create temporary directory")]
    TempDirNotFound,
    /// The privilege escalation prompt shown before installing a Linux package
    /// failed or was dismissed by the user.
    #[error("Authentication failed or was cancelled")]
    AuthenticationFailed,
    /// Installing the downloaded `.deb` package failed.
    #[error("Failed to install .deb package")]
    DebInstallFailed,
    /// The package manager could not install the downloaded Linux package.
    #[error("Failed to install package")]
    PackageInstallFailed,
    /// The downloaded update is not in a format the updater can install on the current platform.
    #[error("invalid updater binary format")]
    InvalidUpdaterFormat,
    /// `http` crate errors.
    #[error(transparent)]
    Http(#[from] http::Error),
    /// A request header value is not valid.
    #[error(transparent)]
    InvalidHeaderValue(#[from] http::header::InvalidHeaderValue),
    /// A request header name is not valid.
    #[error(transparent)]
    InvalidHeaderName(#[from] http::header::InvalidHeaderName),
    /// The release publish date could not be formatted as an RFC 3339 string.
    #[error("Failed to format date")]
    FormatDate,
    /// The configured updater endpoint must use a secure protocol like `https`
    #[error("The configured updater endpoint must use a secure protocol like `https`.")]
    InsecureTransportProtocol,
    /// The version the artifact was signed for does not match the version announced by the
    /// update endpoint.
    #[error(
        "The update was signed for version {signed} but the update endpoint announced version {announced}. The endpoint response may have been tampered with to force installing a different release."
    )]
    SignedVersionMismatch {
        /// The version read from the signature's trusted comment.
        signed: String,
        /// The version announced by the update endpoint.
        announced: String,
    },
    /// `requireSignedVersion` is enabled but the signature does not carry a version.
    #[error(
        "The update signature does not specify the version it was signed for, which `requireSignedVersion` requires. Re-sign and re-publish this release, or disable `requireSignedVersion`."
    )]
    MissingSignedVersion,
    /// Tauri errors.
    #[error(transparent)]
    Tauri(#[from] tauri::Error),
}

impl Serialize for Error {
    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(self.to_string().as_ref())
    }
}

/// A [`Result`](std::result::Result) alias whose error type is the updater [`Error`](enum@Error).
pub type Result<T> = std::result::Result<T, Error>;