// 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.

package main

import (
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"os"
	"path"
	"strings"

	"github.com/google/subcommands"

	"go.fuchsia.dev/fuchsia/tools/artifactory"
	"go.fuchsia.dev/fuchsia/tools/build"
	"go.fuchsia.dev/fuchsia/tools/lib/logger"
)

const (
	// Relative path within the build directory to the repo produced by a build.
	repoSubpath = "amber-files"
	// Names of the repository metadata, key, blob, and target directories within a repo.
	metadataDirName = "repository"
	keyDirName      = "keys"
	blobDirName     = "blobs"
	targetDirName   = "targets"

	// Names of directories to be uploaded to in GCS.
	assemblyInputArchivesDirName = "assembly"
	buildAPIDirName              = "build_api"
	buildidDirName               = "buildid"
	debugDirName                 = "debug"
	hostTestDirName              = "host_tests"
	imageDirName                 = "images"
	packageDirName               = "packages"
	sdkArchivesDirName           = "sdk"
	toolDirName                  = "tools"

	// A record of all of the fuchsia debug symbols processed.
	// This is eventually consumed by crash reporting infrastructure.
	// TODO(fxbug.dev/75356): Have the crash reporting infrastructure
	// consume build-ids.json instead.
	buildIDsTxt = "build-ids.txt"

	// A mapping of build ids to binary labels.
	buildIDsToLabelsManifestName = "build-ids.json"

	// The blobs manifest. TODO(fxbug.dev/60322) remove this.
	blobManifestName = "blobs.json"

	// A list of all Public Platform Surface Areas.
	ctsPlasaReportName = "test_coverage_report.plasa.json"

	// The ELF sizes manifest.
	elfSizesManifestName = "elf_sizes.json"

	// A mapping of fidl mangled names to api functions.
	fidlMangledToApiMappingManifestName = "fidl_mangled_to_api_mapping.json"
)

type upCommand struct {
	// Unique namespace under which to index artifacts.
	namespace string
	// Whether to emit upload manifest JSON to this path instead of executing
	// uploads.
	uploadManifestJSONOutput string
}

func (upCommand) Name() string { return "up" }

func (upCommand) Synopsis() string { return "emit a GCS upload manifest for a build" }

func (upCommand) Usage() string {
	return `
artifactory up -namespace $NAMESPACE <build directory>

Emits a GCS upload manifest for a build with the following structure:

├── $GCS_BUCKET
│   │   ├── assembly
│   │   │   └── <assembly input archives>
│   │   ├── blobs
│   │   │   └── <blob names>
│   │   ├── debug
│   │   │   └── <debug binaries in zxdb format>
│   │   ├── buildid
│   │   │   └── <debug binaries in debuginfod format>
│   │   ├── $NAMESPACE
│   │   │   ├── build-ids.json
│   │   │   ├── build-ids.txt
│   │   │   ├── jiri.snapshot
│   │   │   ├── objs_to_refresh_ttl.txt
│   │   │   ├── publickey.pem
│   │   │   ├── images
│   │   │   │   └── <images>
│   │   │   ├── packages
│   │   │   │   ├── all_blobs.json
│   │   │   │   ├── blobs.json
│   │   │   │   ├── elf_sizes.json
│   │   │   │   ├── repository
│   │   │   │   │   ├── targets
│   │   │   │   │   │   └── <package repo target files>
│   │   │   │   │   └── <package repo metadata files>
│   │   │   │   └── keys
│   │   │   │       └── <package repo keys>
│   │   │   ├── sdk
│   │   │   │   ├── <host-independent SDK archives>
│   │   │   │   └── <OS-CPU>
│   │   │   │       └── <host-specific SDK archives>
│   │   │   ├── build_api
│   │   │   │   └── <build API module JSON>
|   |   |   ├── host_tests
│   │   │   │   └── <host tests and deps, same hierarchy as build dir>
│   │   │   ├── tools
│   │   │   │   └── <OS>-<CPU>
│   │   │   │       └── <tool names>

Where $GCS_BUCKET is defined by the infrastructure.

flags:

`
}

func (cmd *upCommand) SetFlags(f *flag.FlagSet) {
	f.StringVar(&cmd.namespace, "namespace", "", "Namespace under which to index artifacts.")
	f.StringVar(&cmd.uploadManifestJSONOutput, "upload-manifest-json-output", "", "Whether to emit upload manifest to this path instead of executing uploads.")
}

func (cmd upCommand) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
	args := f.Args()
	if len(args) != 1 {
		logger.Errorf(ctx, "exactly one positional argument expected: the build directory root")
		return subcommands.ExitFailure
	}

	if err := cmd.execute(ctx, args[0]); err != nil {
		logger.Errorf(ctx, "%v", err)
		return subcommands.ExitFailure
	}
	return subcommands.ExitSuccess
}

func (cmd upCommand) execute(ctx context.Context, buildDir string) error {
	if cmd.namespace == "" {
		return fmt.Errorf("-namespace is required")
	}
	if cmd.uploadManifestJSONOutput == "" {
		return fmt.Errorf("-upload-manifest-json-output is required")
	}

	m, err := build.NewModules(buildDir)
	if err != nil {
		return err
	}

	repo := path.Join(buildDir, repoSubpath)
	metadataDir := path.Join(repo, metadataDirName)
	keyDir := path.Join(repo, keyDirName)
	blobDir := path.Join(metadataDir, blobDirName)
	targetDir := path.Join(metadataDir, targetDirName)
	packageNamespaceDir := path.Join(cmd.namespace, packageDirName)
	imageNamespaceDir := path.Join(cmd.namespace, imageDirName)

	uploads := []artifactory.Upload{
		{
			Source:      blobDir,
			Destination: blobDirName,
			Deduplicate: true,
		},
		{
			Source:      metadataDir,
			Destination: path.Join(packageNamespaceDir, metadataDirName),
			Deduplicate: false,
		},
		{
			Source:      keyDir,
			Destination: path.Join(packageNamespaceDir, keyDirName),
			Deduplicate: false,
		},
		{
			Source:      targetDir,
			Destination: path.Join(packageNamespaceDir, metadataDirName, targetDirName),
			Deduplicate: false,
			Recursive:   true,
		},
		{
			Source:      path.Join(buildDir, blobManifestName),
			Destination: path.Join(packageNamespaceDir, blobManifestName),
		},
		{
			Source:      path.Join(buildDir, elfSizesManifestName),
			Destination: path.Join(packageNamespaceDir, elfSizesManifestName),
		},
		// Used for CTS test coverage.
		{
			Source:      path.Join(buildDir, fidlMangledToApiMappingManifestName),
			Destination: path.Join(cmd.namespace, fidlMangledToApiMappingManifestName),
		},
		{
			Source:      path.Join(buildDir, ctsPlasaReportName),
			Destination: path.Join(cmd.namespace, ctsPlasaReportName),
		},
	}

	allBlobsUpload, err := artifactory.BlobsUpload(m, path.Join(packageNamespaceDir, "all_blobs.json"))
	if err != nil {
		return fmt.Errorf("failed to obtain blobs upload: %w", err)
	}
	uploads = append(uploads, allBlobsUpload)

	images, err := artifactory.ImageUploads(m, imageNamespaceDir)
	if err != nil {
		return err
	}
	uploads = append(uploads, images...)

	productBundle, err := artifactory.ProductBundleUploads(m, packageNamespaceDir, blobDirName, imageNamespaceDir)
	if err != nil {
		return err
	}
	// Check that an upload isn't nil as product bundle doesn't exist for "bringup" and SDK builds.
	if productBundle != nil {
		uploads = append(uploads, *productBundle)
	}

	buildAPIs := artifactory.BuildAPIModuleUploads(m, path.Join(cmd.namespace, buildAPIDirName))
	uploads = append(uploads, buildAPIs...)

	assemblyInputArchives := artifactory.AssemblyInputArchiveUploads(m, path.Join(cmd.namespace, assemblyInputArchivesDirName))
	uploads = append(uploads, assemblyInputArchives...)

	sdkArchives := artifactory.SDKArchiveUploads(m, path.Join(cmd.namespace, sdkArchivesDirName))
	uploads = append(uploads, sdkArchives...)

	tools := artifactory.ToolUploads(m, path.Join(cmd.namespace, toolDirName))
	uploads = append(uploads, tools...)

	debugBinaries, buildIDsToLabels, buildIDs, err := artifactory.DebugBinaryUploads(ctx, m, debugDirName, buildidDirName)
	if err != nil {
		return err
	}
	uploads = append(uploads, debugBinaries...)

	uploads = append(uploads, artifactory.Upload{
		Contents:    []byte(strings.Join(buildIDs, "\n")),
		Destination: path.Join(cmd.namespace, buildIDsTxt),
	})
	buildIDsToLabelsJSON, err := json.MarshalIndent(buildIDsToLabels, "", "  ")
	if err != nil {
		return err
	}
	uploads = append(uploads, artifactory.Upload{
		Contents:    buildIDsToLabelsJSON,
		Destination: path.Join(cmd.namespace, buildIDsToLabelsManifestName),
	})

	uploads, err = filterNonExistentFiles(ctx, uploads)
	if err != nil {
		return err
	}

	out, err := os.Create(cmd.uploadManifestJSONOutput)
	if err != nil {
		return err
	}
	defer out.Close()
	data, err := json.MarshalIndent(uploads, "", "  ")
	if err != nil {
		return err
	}
	_, err = out.Write(data)
	return err
}

// filterNonExistentFiles filters out files which do not exist. The associated
// artifacts referenced by the build API manifests may not have been created,
// and this is valid.
func filterNonExistentFiles(ctx context.Context, uploads []artifactory.Upload) ([]artifactory.Upload, error) {
	var filtered []artifactory.Upload
	for _, u := range uploads {
		if len(u.Source) != 0 {
			_, err := os.Stat(u.Source)
			if err != nil {
				if os.IsNotExist(err) {
					logger.Infof(ctx, "%s does not exist; skipping upload", u.Source)
					continue
				}
				return nil, err
			}
		}
		filtered = append(filtered, u)
	}
	return filtered, nil
}