// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see <http://www.gnu.org/licenses/>.

package backend_test

import (
	. "github.com/mudler/luet/pkg/compiler"
	. "github.com/mudler/luet/pkg/compiler/backend"

	"io/ioutil"
	"os"
	"path/filepath"

	helpers "github.com/mudler/luet/pkg/helpers"
	pkg "github.com/mudler/luet/pkg/package"
	"github.com/mudler/luet/pkg/tree"
	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

var _ = Describe("Docker backend", func() {
	Context("Simple Docker backend satisfies main interface functionalities", func() {
		It("Builds and generate tars", func() {
			generalRecipe := tree.NewGeneralRecipe()

			err := generalRecipe.Load("../../../tests/fixtures/buildtree")
			Expect(err).ToNot(HaveOccurred())
			Expect(generalRecipe.Tree()).ToNot(BeNil()) // It should be populated back at this point

			Expect(len(generalRecipe.Tree().GetPackageSet().GetPackages())).To(Equal(1))

			compiler := NewLuetCompiler(nil, generalRecipe.Tree())
			spec, err := compiler.FromPackage(&pkg.DefaultPackage{Name: "enman", Category: "app-admin", Version: "1.4.0"})
			Expect(err).ToNot(HaveOccurred())

			lspec, ok := spec.(*LuetCompilationSpec)
			Expect(ok).To(BeTrue())

			Expect(lspec.Steps).To(Equal([]string{"echo foo > /test", "echo bar > /test2"}))
			Expect(lspec.Image).To(Equal("luet/base"))
			Expect(lspec.Seed).To(Equal("alpine"))
			tmpdir, err := ioutil.TempDir(os.TempDir(), "tree")
			Expect(err).ToNot(HaveOccurred())
			defer os.RemoveAll(tmpdir) // clean up

			tmpdir2, err := ioutil.TempDir(os.TempDir(), "tree2")
			Expect(err).ToNot(HaveOccurred())
			defer os.RemoveAll(tmpdir2) // clean up

			err = lspec.WriteBuildImageDefinition(filepath.Join(tmpdir, "Dockerfile"))
			Expect(err).ToNot(HaveOccurred())
			dockerfile, err := helpers.Read(filepath.Join(tmpdir, "Dockerfile"))
			Expect(err).ToNot(HaveOccurred())
			Expect(dockerfile).To(Equal(`
FROM alpine
COPY . /luetbuild
WORKDIR /luetbuild
`))
			b := NewSimpleDockerBackend()
			opts := CompilerBackendOptions{
				ImageName:      "luet/base",
				SourcePath:     tmpdir,
				DockerFileName: "Dockerfile",
				Destination:    filepath.Join(tmpdir2, "output1.tar"),
			}
			Expect(b.ImageDefinitionToTar(opts)).ToNot(HaveOccurred())
			Expect(helpers.Exists(filepath.Join(tmpdir2, "output1.tar"))).To(BeTrue())
			Expect(b.BuildImage(opts)).ToNot(HaveOccurred())

			err = lspec.WriteStepImageDefinition(lspec.Image, filepath.Join(tmpdir, "LuetDockerfile"))
			Expect(err).ToNot(HaveOccurred())
			dockerfile, err = helpers.Read(filepath.Join(tmpdir, "LuetDockerfile"))
			Expect(err).ToNot(HaveOccurred())
			Expect(dockerfile).To(Equal(`
FROM luet/base
RUN echo foo > /test
RUN echo bar > /test2`))
			opts = CompilerBackendOptions{
				ImageName:      "test",
				SourcePath:     tmpdir,
				DockerFileName: "LuetDockerfile",
				Destination:    filepath.Join(tmpdir, "output2.tar"),
			}
			Expect(b.ImageDefinitionToTar(opts)).ToNot(HaveOccurred())
			Expect(helpers.Exists(filepath.Join(tmpdir, "output2.tar"))).To(BeTrue())

			Expect(b.Changes(filepath.Join(tmpdir2, "output1.tar"), filepath.Join(tmpdir, "output2.tar"))).To(Equal(
				[]ArtifactLayer{{
					FromImage: filepath.Join(tmpdir2, "output1.tar"),
					ToImage:   filepath.Join(tmpdir, "output2.tar"),
					Diffs: ArtifactDiffs{
						Additions: []ArtifactNode{
							{Name: "/test", Size: 4},
							{Name: "/test2", Size: 4},
						},
					},
				}}))

		})

	})
})