package fixtures

import (
	"fmt"
	"go/build"
	"io/ioutil"
	"os"
	"path/filepath"

	"github.com/alcortesm/tgz"

	"gopkg.in/check.v1"
	"gopkg.in/src-d/go-git.v4/plumbing"
	"gopkg.in/src-d/go-git.v4/utils/fs"
	osfs "gopkg.in/src-d/go-git.v4/utils/fs/os"
)

var RootFolder = ""

const DataFolder = "data"

var folders = make(map[string]bool, 0)

var fixtures = Fixtures{{
	Tags:         []string{"packfile", "ofs-delta", ".git"},
	URL:          "https://github.com/git-fixtures/basic.git",
	Head:         plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
	PackfileHash: plumbing.NewHash("a3fed42da1e8189a077c0e6846c040dcf73fc9dd"),
	DotGitHash:   plumbing.NewHash("7a725350b88b05ca03541b59dd0649fda7f521f2"),
	ObjectsCount: 31,
}, {
	Tags:         []string{"packfile", "ref-delta", ".git"},
	URL:          "https://github.com/git-fixtures/basic.git",
	Head:         plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
	PackfileHash: plumbing.NewHash("c544593473465e6315ad4182d04d366c4592b829"),
	DotGitHash:   plumbing.NewHash("7cbde0ca02f13aedd5ec8b358ca17b1c0bf5ee64"),
	ObjectsCount: 31,
}, {
	Tags:         []string{"packfile", "ofs-delta", ".git", "single-branch"},
	URL:          "https://github.com/git-fixtures/basic.git",
	Head:         plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
	PackfileHash: plumbing.NewHash("61f0ee9c75af1f9678e6f76ff39fbe372b6f1c45"),
	DotGitHash:   plumbing.NewHash("21504f6d2cc2ef0c9d6ebb8802c7b49abae40c1a"),
	ObjectsCount: 28,
}, {
	Tags:       []string{".git", "merge-conflict"},
	URL:        "https://github.com/git-fixtures/basic.git",
	DotGitHash: plumbing.NewHash("4870d54b5b04e43da8cf99ceec179d9675494af8"),
}, {
	Tags:       []string{".git", "resolve-undo"},
	URL:        "https://github.com/git-fixtures/basic.git",
	DotGitHash: plumbing.NewHash("df6781fd40b8f4911d70ce71f8387b991615cd6d"),
}, {
	Tags:       []string{".git", "intent-to-add"},
	URL:        "https://github.com/git-fixtures/basic.git",
	DotGitHash: plumbing.NewHash("4e7600af05c3356e8b142263e127b76f010facfc"),
}, {
	Tags:       []string{".git", "index-v4"},
	URL:        "https://github.com/git-fixtures/basic.git",
	DotGitHash: plumbing.NewHash("935e5ac17c41c309c356639816ea0694a568c484"),
}, {

	Tags:         []string{"packfile", ".git", "unpacked", "multi-packfile"},
	URL:          "https://github.com/src-d/go-git.git",
	Head:         plumbing.NewHash("e8788ad9165781196e917292d6055cba1d78664e"),
	PackfileHash: plumbing.NewHash("3559b3b47e695b33b0913237a4df3357e739831c"),
	DotGitHash:   plumbing.NewHash("174be6bd4292c18160542ae6dc6704b877b8a01a"),
	ObjectsCount: 2133,
}, {
	Tags:         []string{"packfile", ".git", "tags"},
	URL:          "https://github.com/git-fixtures/tags.git",
	Head:         plumbing.NewHash("f7b877701fbf855b44c0a9e86f3fdce2c298b07f"),
	DotGitHash:   plumbing.NewHash("c0c7c57ab1753ddbd26cc45322299ddd12842794"),
	PackfileHash: plumbing.NewHash("b68617dd8637fe6409d9842825a843a1d9a6e484"),
	ObjectsCount: 7,
}, {
	Tags:         []string{"packfile"},
	URL:          "https://github.com/spinnaker/spinnaker.git",
	Head:         plumbing.NewHash("06ce06d0fc49646c4de733c45b7788aabad98a6f"),
	PackfileHash: plumbing.NewHash("f2e0a8889a746f7600e07d2246a2e29a72f696be"),
}, {
	Tags:         []string{"packfile"},
	URL:          "https://github.com/jamesob/desk.git",
	Head:         plumbing.NewHash("d2313db6e7ca7bac79b819d767b2a1449abb0a5d"),
	PackfileHash: plumbing.NewHash("4ec6344877f494690fc800aceaf2ca0e86786acb"),
}, {
	Tags:         []string{"packfile", "empty-folder"},
	URL:          "https://github.com/cpcs499/Final_Pres_P.git",
	Head:         plumbing.NewHash("70bade703ce556c2c7391a8065c45c943e8b6bc3"),
	PackfileHash: plumbing.NewHash("29f304662fd64f102d94722cf5bd8802d9a9472c"),
	DotGitHash:   plumbing.NewHash("e1580a78f7d36791249df76df8a2a2613d629902"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/github/gem-builder.git",
	PackfileHash: plumbing.NewHash("1ea0b3971fd64fdcdf3282bfb58e8cf10095e4e6"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/githubtraining/example-branches.git",
	PackfileHash: plumbing.NewHash("bb8ee94710d3fa39379a630f76812c187217b312"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/rumpkernel/rumprun-xen.git",
	PackfileHash: plumbing.NewHash("7861f2632868833a35fe5e4ab94f99638ec5129b"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/mcuadros/skeetr.git",
	PackfileHash: plumbing.NewHash("36ef7a2296bfd526020340d27c5e1faa805d8d38"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/dezfowler/LiteMock.git",
	PackfileHash: plumbing.NewHash("0d9b6cfc261785837939aaede5986d7a7c212518"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/tyba/storable.git",
	PackfileHash: plumbing.NewHash("0d3d824fb5c930e7e7e1f0f399f2976847d31fd3"),
}, {
	Tags:         []string{"packfile", "diff-tree"},
	URL:          "https://github.com/toqueteos/ts3.git",
	PackfileHash: plumbing.NewHash("21b33a26eb7ffbd35261149fe5d886b9debab7cb"),
}, {
	Tags:         []string{"empty", ".git"},
	URL:          "https://github.com/git-fixtures/empty.git",
	DotGitHash:   plumbing.NewHash("bf3fedcc8e20fd0dec9172987ceea0038d17b516"),
	ObjectsCount: 0,
}}

func All() Fixtures {
	return fixtures
}

func Basic() Fixtures {
	return ByURL("https://github.com/git-fixtures/basic.git").
		Exclude("single-branch")
}

func ByURL(url string) Fixtures {
	return fixtures.ByURL(url)
}

func ByTag(tag string) Fixtures {
	return fixtures.ByTag(tag)
}

type Fixture struct {
	URL          string
	Tags         []string
	Head         plumbing.Hash
	PackfileHash plumbing.Hash
	DotGitHash   plumbing.Hash
	ObjectsCount int32
}

func (f *Fixture) Is(tag string) bool {
	for _, t := range f.Tags {
		if t == tag {
			return true
		}
	}

	return false
}

func (f *Fixture) Packfile() *os.File {
	fn := filepath.Join(RootFolder, DataFolder, fmt.Sprintf("pack-%s.pack", f.PackfileHash))
	file, err := os.Open(fn)
	if err != nil {
		panic(err)
	}

	return file
}

func (f *Fixture) Idx() *os.File {
	fn := filepath.Join(RootFolder, DataFolder, fmt.Sprintf("pack-%s.idx", f.PackfileHash))
	file, err := os.Open(fn)
	if err != nil {
		panic(err)
	}

	return file
}

// DotGit creates a new temporary directory and unpacks the repository .git
// directory into it. Multiple calls to DotGit returns different directories.
func (f *Fixture) DotGit() fs.Filesystem {
	fn := filepath.Join(RootFolder, DataFolder, fmt.Sprintf("git-%s.tgz", f.DotGitHash))
	path, err := tgz.Extract(fn)
	if err != nil {
		panic(err)
	}

	folders[path] = true
	return osfs.New(path)
}

func (f *Fixture) Worktree() fs.Filesystem {
	fn := filepath.Join(RootFolder, DataFolder, fmt.Sprintf("git-%s.tgz", f.DotGitHash))
	git, err := tgz.Extract(fn)
	if err != nil {
		panic(err)
	}

	worktree, err := ioutil.TempDir("", "worktree")
	if err != nil {
		panic(err)
	}

	if err := os.Rename(git, filepath.Join(worktree, ".git")); err != nil {
		panic(err)
	}

	return osfs.New(worktree)
}

type Fixtures []*Fixture

func (g Fixtures) Test(c *check.C, test func(*Fixture)) {
	for _, f := range g {
		c.Logf("executing test at %s %s", f.URL, f.Tags)
		test(f)
	}
}

func (g Fixtures) One() *Fixture {
	return g[0]
}

func (g Fixtures) ByTag(tag string) Fixtures {
	r := make(Fixtures, 0)
	for _, f := range g {
		if f.Is(tag) {
			r = append(r, f)
		}
	}

	return r
}
func (g Fixtures) ByURL(url string) Fixtures {
	r := make(Fixtures, 0)
	for _, f := range g {
		if f.URL == url {
			r = append(r, f)
		}
	}

	return r
}

func (g Fixtures) Exclude(tag string) Fixtures {
	r := make(Fixtures, 0)
	for _, f := range g {
		if !f.Is(tag) {
			r = append(r, f)
		}
	}

	return r
}

type Suite struct{}

func (s *Suite) SetUpSuite(c *check.C) {
	RootFolder = filepath.Join(
		build.Default.GOPATH,
		"src", "gopkg.in/src-d/go-git.v4", "fixtures",
	)
}

func (s *Suite) TearDownSuite(c *check.C) {
	for f := range folders {
		err := os.RemoveAll(f)
		c.Assert(err, check.IsNil)

		delete(folders, f)
	}
}