// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use fuchsia_merkle::Hash;
use fuchsia_url::errors::{PackagePathSegmentError, ResourcePathError};
use std::io;
use std::path::PathBuf;
use tempfile::PersistError;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum PackageBuildManifestError {
    #[error("manifest contains an invalid resource path '{}'.", path)]
    ResourcePath {
        #[source]
        cause: ResourcePathError,
        path: String,
    },

    #[error("attempted to deserialize creation manifest from malformed json")]
    Json(#[from] serde_json::Error),

    #[error("package external content cannot be in 'meta/' directory: {}", path)]
    ExternalContentInMetaDirectory { path: String },

    #[error("package far content must be in 'meta/' directory: {}", path)]
    FarContentNotInMetaDirectory { path: String },

    #[error("entry has no '=': '{}'", entry)]
    EntryHasNoEqualsSign { entry: String },

    #[error("duplicate resource path: '{}'", path)]
    DuplicateResourcePath { path: String },

    #[error("io error")]
    IoError(#[from] io::Error),

    #[error("error occurred when traverse the contents of a directory")]
    WalkDir(#[from] walkdir::Error),

    #[error("error occurred when strip prefix from the path")]
    StripPrefixError(#[from] std::path::StripPrefixError),

    #[error("the resource path is empty")]
    EmptyResourcePath,

    #[error("manifest contains an invalid file path '{}'.", path.display())]
    InvalidFileType { path: PathBuf },

    #[error("file directory collision at: {:?}", path)]
    FileDirectoryCollision { path: String },
}

#[derive(Debug, Error)]
pub enum PackageManifestError {
    #[error("package contains an invalid blob source path '{source_path:?}'. {merkle}")]
    InvalidBlobPath { merkle: Hash, source_path: PathBuf },

    #[error("package contains an invalid subpackage path '{path:?}'. {merkle}")]
    InvalidSubpackagePath { merkle: Hash, path: PathBuf },

    #[error("io error")]
    IoError(#[from] io::Error),

    #[error("io error {cause}: '{path}'")]
    IoErrorWithPath { cause: io::Error, path: PathBuf },

    #[error("meta contents")]
    MetaContents(#[from] MetaContentsError),

    #[error("meta package")]
    MetaPackage(#[from] MetaPackageError),

    #[error("meta subpackages")]
    MetaSubpackages(#[from] MetaSubpackagesError),

    #[error("archive")]
    Archive(#[from] fuchsia_archive::Error),

    #[error("writing to relative path failed")]
    RelativeWrite(#[source] anyhow::Error),

    #[error("persisting to file failed: '{path}'")]
    Persist {
        #[source]
        cause: PersistError,
        path: PathBuf,
    },

    #[error("decompressing delivery blob failed: '{path}'")]
    DecompressDeliveryBlob {
        #[source]
        cause: delivery_blob::DecompressError,
        path: PathBuf,
    },
}

#[derive(Debug, Error)]
pub enum MetaContentsError {
    #[error("invalid resource path: '{:?}'", path)]
    InvalidResourcePath {
        #[source]
        cause: ResourcePathError,
        path: String,
    },

    #[error("package external content cannot be in 'meta/' directory: '{:?}'", path)]
    ExternalContentInMetaDirectory { path: String },

    #[error("entry has no '=': '{:?}'", entry)]
    EntryHasNoEqualsSign { entry: String },

    #[error("duplicate resource path: '{:?}'", path)]
    DuplicateResourcePath { path: String },

    #[error("io error")]
    IoError(#[from] io::Error),

    #[error("invalid hash")]
    ParseHash(#[from] fuchsia_hash::ParseHashError),

    #[error("collision between a file and a directory at path: '{:?}'", path)]
    FileDirectoryCollision { path: String },
}

#[derive(Debug, Error)]
pub enum MetaPackageError {
    #[error("invalid package name")]
    PackageName(#[source] PackagePathSegmentError),

    #[error("invalid package variant")]
    PackageVariant(#[source] PackagePathSegmentError),

    #[error("attempted to deserialize meta/package from malformed json: {}", _0)]
    Json(#[from] serde_json::Error),

    #[error("meta/package file not found")]
    MetaPackageMissing,
}

#[derive(Debug, Error)]
pub enum MetaSubpackagesError {
    #[error("invalid subpackage name: '{:?}'", name)]
    InvalidSubpackageName {
        #[source]
        cause: PackagePathSegmentError,
        name: String,
    },

    #[error("attempted to deserialize {} from malformed json", crate::MetaSubpackages::PATH)]
    Json(#[from] serde_json::Error),

    #[error("duplicate subpackage name: '{:?}'", name)]
    DuplicateSubpackageName { name: String },

    #[error("io error")]
    IoError(#[from] io::Error),

    #[error("invalid hash")]
    ParseHash(#[from] fuchsia_hash::ParseHashError),
}

#[derive(Debug, Error)]
pub enum BuildError {
    #[error("io: {}", _0)]
    IoError(#[from] io::Error),

    #[error("{cause}: '{path}'")]
    IoErrorWithPath { cause: io::Error, path: PathBuf },

    #[error("meta contents")]
    MetaContents(#[from] MetaContentsError),

    #[error("meta package")]
    MetaPackage(#[from] MetaPackageError),

    #[error("meta subpackages")]
    MetaSubpackages(#[from] MetaSubpackagesError),

    #[error("package name")]
    PackageName(#[source] PackagePathSegmentError),

    #[error("package manifest")]
    PackageManifest(#[from] PackageManifestError),

    #[error(
        "the creation manifest contained a resource path that conflicts with a generated resource path: '{}'",
        conflicting_resource_path
    )]
    ConflictingResource { conflicting_resource_path: String },

    #[error("archive write")]
    ArchiveWrite(#[from] fuchsia_archive::Error),
}

impl From<(io::Error, PathBuf)> for BuildError {
    fn from(pair: (io::Error, PathBuf)) -> Self {
        Self::IoErrorWithPath { cause: pair.0, path: pair.1 }
    }
}

#[derive(Debug, Error, Eq, PartialEq)]
pub enum ParsePackagePathError {
    #[error("package path has more than two segments")]
    TooManySegments,

    #[error("package path has fewer than two segments")]
    TooFewSegments,

    #[error("invalid package name")]
    PackageName(#[source] PackagePathSegmentError),

    #[error("invalid package variant")]
    PackageVariant(#[source] PackagePathSegmentError),
}