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use futures::channel::mpsc;
use kdl::{KdlDocument, KdlNode};
use miette::Diagnostic;
use thiserror::Error;

use crate::{NpmPackageLock, NpmPackageLockEntry};

#[allow(clippy::large_enum_variant)]
#[derive(Debug, Error, Diagnostic)]
pub enum NodeMaintainerError {
    /// Unsupported resolved URL scheme
    #[error("Unsupported resolved URL scheme")]
    #[diagnostic(code(node_maintainer::kdl::unsupported_url_scheme), url(docsrs))]
    UnsupportedScheme(String),

    /// Failed to parse a resolved URL while parsing lockfile
    #[error("Failed to parse a resolved URL while parsing lockfile: {0}")]
    #[diagnostic(code(node_maintainer::kdl::url_parse_error), url(docsrs))]
    UrlParseError(String, #[source] url::ParseError),

    /// Failed to parse a Semver string.
    #[error("Failed to parse a Semver string.")]
    #[diagnostic(code(node_maintainer::kdl::semver_parse_error), url(docsrs))]
    SemverParseError(#[from] node_semver::SemverError),

    /// Missing version for NPM package entry in lockfile.
    #[error("Missing version for NPM package entry in lockfile.")]
    #[diagnostic(code(node_maintainer::kdl::missing_version), url(docsrs))]
    MissingVersion,

    /// Missing resolution for package entry in lockfile.
    #[error("Missing version for NPM package entry in lockfile.")]
    #[diagnostic(code(node_maintainer::kdl::missing_version), url(docsrs))]
    MissingResolution,

    /// Failed to parse an integrity value.
    #[error(transparent)]
    #[diagnostic(code(node_maintainer::kdl::integrity_parse_error), url(docsrs))]
    IntegrityParseError(#[from] ssri::Error),

    /// Failed to parse an integrity value while loading lockfile.
    #[error("Failed to parse an integrity value while loading lockfile node:\n{0}")]
    #[diagnostic(code(node_maintainer::kdl::integrity_parse_error), url(docsrs))]
    KdlLockfileIntegrityParseError(KdlNode, #[source] ssri::Error),

    /// Missing package node name.
    #[error("Missing package node name:\n{0}")]
    #[diagnostic(code(node_maintainer::kdl::missing_node_name), url(docsrs))]
    KdlLockMissingName(KdlNode),

    /// Missing package node name.
    #[error("Missing package name:\n{0:#?}")]
    #[diagnostic(code(node_maintainer::npm::missing_name), url(docsrs))]
    NpmLockMissingName(Box<NpmPackageLockEntry>),

    /// Failed to parse an integrity value while loading NPM lockfile.
    #[error("Failed to parse an integrity value while loading lockfile node:\n{0:#?}")]
    #[diagnostic(code(node_maintainer::npm::integrity_parse_error), url(docsrs))]
    NpmLockfileIntegrityParseError(Box<NpmPackageLockEntry>, #[source] ssri::Error),

    /// Unsupported NPM Package Lock version.
    #[error("Unsupported NPM Package Lock version: {0}")]
    #[diagnostic(
        code(node_maintainer::npm::unsupported_package_lock_Version),
        url(docsrs)
    )]
    NpmUnsupportedPackageLockVersion(u64),

    /// No root node in KDL lockfile.
    #[error("No root node in KDL lockfile.")]
    #[diagnostic(code(node_maintainer::kdl::missing_root), url(docsrs))]
    KdlLockMissingRoot(KdlDocument),

    /// No root node in NPM lockfile.
    #[error("No root package in NPM lockfile.")]
    #[diagnostic(code(node_maintainer::npm::missing_root), url(docsrs))]
    NpmLockMissingRoot(NpmPackageLock),

    /// Error parsing lockfile.
    #[error(transparent)]
    #[diagnostic(code(node_maintainer::kdl::parse_error), url(docsrs))]
    KdlParseError(#[from] kdl::KdlError),

    #[error("Invalid lockfile version format.")]
    #[diagnostic(code(node_maintainer::kdl::invalid_lockfile_version), url(docsrs))]
    InvalidLockfileVersion,

    /// Error from serde_wasm_bindgen
    #[cfg(target_arch = "wasm32")]
    #[error(transparent)]
    #[diagnostic(code(node_maintainer::serde_wasm_bindgen::error), url(docsrs))]
    SerdeWasmBindgenError(#[from] serde_wasm_bindgen::Error),

    /// Generic package spec error.
    #[error(transparent)]
    #[diagnostic(transparent)]
    PackageSpecError(#[from] oro_package_spec::PackageSpecError),

    /// Generic IO Error.
    #[error("{0}")]
    #[diagnostic(code(node_maintainer::io_error), url(docsrs))]
    IoError(String, #[source] std::io::Error),

    #[cfg(not(target_arch = "wasm32"))]
    /// Generic error returned from Nassun.
    #[error(transparent)]
    #[diagnostic(transparent)]
    NassunError(#[from] nassun::NassunError),

    /// Failed to create either a symlink or a junction while linking
    /// dependencies using the isolated linker.
    ///
    /// This can happen if the user does not have permission to create
    /// symlinks on a Windows system, and the fallback junction operation
    /// fails for some reason--likely because junctions are also unsupported.
    ///
    /// Since only administrator-elevated users can create symlinks on
    /// Windows, the best workaround for this issue is to switch to the
    /// hoisted linker.
    ///
    /// In Orogene, this is the `--hoisted` flag, or `options { hoisted true;
    /// }` in oro.kdl.
    #[cfg(windows)]
    #[error("Failed to create either a symlink or junction from {} to {}.", .0.display(), .1.display())]
    #[diagnostic(
        code(node_maintainer::junctions_not_supported),
        url(docsrs),
        help("The isolated linker requires your Windows user to either be able to create symlinks, which requires Administrator privileges, or create junctions, which require an NTFS filesystem, among other things. If you see this message, you might consider switching to the 'hoisted' linker instead.")
    )]
    JunctionsNotSupported(
        std::path::PathBuf,
        std::path::PathBuf,
        #[source] std::io::Error,
    ),

    #[cfg(target_arch = "wasm32")]
    /// Generic error returned from Nassun.
    #[error(transparent)]
    #[diagnostic(transparent)]
    NassunError(#[from] nassun::error::NassunError),

    /// Generic serde_json error.
    #[error(transparent)]
    #[diagnostic(code(node_maintainer::serde_json_error), url(docsrs))]
    SerdeJsonError(#[from] serde_json::Error),

    /// Generic error. Refer to the error message for more details.
    #[error("{0}")]
    #[diagnostic(code(node_maintainer::miscellaneous_error), url(docsrs))]
    MiscError(String),

    /// Failed to send data through mpsc channel. This is likely an internal
    /// error of some sort.
    #[error("Failed to send data through mpsc channel.")]
    #[diagnostic(code(node_maintainer::mpsc_error), url(docsrs))]
    TrySendError,

    /// Failed to validate a graph. Refer to the error message for more details.
    #[error("{0}")]
    #[diagnostic(code(node_maintainer::graph_error), url(docsrs))]
    GraphValidationError(String),

    /// Got an error while walking `node_modules`. Refer to the error message
    /// for specific details.
    #[cfg(not(target_arch = "wasm32"))]
    #[error(transparent)]
    #[diagnostic(code(node_maintainer::walkdir_error), url(docsrs))]
    WalkDirError(#[from] walkdir::Error),

    /// Failed to read `package.json` during the build step. Refer to the
    /// error message for more details.
    #[cfg(not(target_arch = "wasm32"))]
    #[error("Failed to read manifest during build step, at {}", .0.display())]
    #[diagnostic(code(node_maintainer::build_manifest_read_error), url(docsrs))]
    BuildManifestReadError(std::path::PathBuf, #[source] std::io::Error),

    /// Some error occurred while running a script. Refer to the error message
    /// for more details.
    #[cfg(not(target_arch = "wasm32"))]
    #[error(transparent)]
    #[diagnostic(transparent)]
    OroScriptError(#[from] oro_script::OroScriptError),

    /// Locked file was requested, but a new dependency tree was resolved that
    /// would cause changes to the lockfile. The contents of `package.json`
    /// may have changed since the last time the lockfile was updated.
    ///
    /// This typically happens when a dependency is added or removed from
    /// package.json while locked mode is enabled. If you have an existing
    /// lockfile and get this error without any modifications to package.json,
    /// please [report this as a
    /// bug](https://github.com/orogene/orogene/issues/new).
    #[error("Locked file was requested, but a new dependency tree was resolved that would cause changes to the lockfile. The contents of `package.json` may have changed since the last time the lockfile was updated.")]
    #[diagnostic(
        code(node_maintainer::lockfile_mismatch),
        url(docsrs),
        help("Did you modify package.json by hand?")
    )]
    LockfileMismatch,
}

impl<T> From<mpsc::TrySendError<T>> for NodeMaintainerError {
    fn from(_: mpsc::TrySendError<T>) -> Self {
        NodeMaintainerError::TrySendError
    }
}

pub trait IoContext {
    type T;

    fn io_context(self, context: impl FnOnce() -> String) -> Result<Self::T, NodeMaintainerError>;
}

impl<T> IoContext for Result<T, std::io::Error> {
    type T = T;

    fn io_context(self, context: impl FnOnce() -> String) -> Result<Self::T, NodeMaintainerError> {
        self.map_err(|e| NodeMaintainerError::IoError(context(), e))
    }
}