package config

import (
	"os"
	"path/filepath"
	"strings"

	"github.com/go-git/go-billy/v5/osfs"
	"github.com/go-git/go-billy/v5/util"
	"github.com/go-git/go-git/v5/plumbing"
	. "gopkg.in/check.v1"
)

type ConfigSuite struct{}

var _ = Suite(&ConfigSuite{})

func (s *ConfigSuite) TestUnmarshal(c *C) {
	input := []byte(`[core]
		bare = true
		worktree = foo
		commentchar = bar
[user]
		name = John Doe
		email = john@example.com
[author]
		name = Jane Roe
		email = jane@example.com
[committer]
		name = Richard Roe
		email = richard@example.com
[pack]
		window = 20
[remote "origin"]
		url = git@github.com:mcuadros/go-git.git
		fetch = +refs/heads/*:refs/remotes/origin/*
[remote "alt"]
		url = git@github.com:mcuadros/go-git.git
		url = git@github.com:src-d/go-git.git
		fetch = +refs/heads/*:refs/remotes/origin/*
		fetch = +refs/pull/*:refs/remotes/origin/pull/*
[remote "insteadOf"]
		url = https://github.com/kostyay/go-git.git
[remote "win-local"]
		url = X:\\Git\\
[submodule "qux"]
		path = qux
		url = https://github.com/foo/qux.git
		branch = bar
[branch "master"]
		remote = origin
		merge = refs/heads/master
[init]
		defaultBranch = main
[url "ssh://git@github.com/"]
	insteadOf = https://github.com/
`)

	cfg := NewConfig()
	err := cfg.Unmarshal(input)
	c.Assert(err, IsNil)

	c.Assert(cfg.Core.IsBare, Equals, true)
	c.Assert(cfg.Core.Worktree, Equals, "foo")
	c.Assert(cfg.Core.CommentChar, Equals, "bar")
	c.Assert(cfg.User.Name, Equals, "John Doe")
	c.Assert(cfg.User.Email, Equals, "john@example.com")
	c.Assert(cfg.Author.Name, Equals, "Jane Roe")
	c.Assert(cfg.Author.Email, Equals, "jane@example.com")
	c.Assert(cfg.Committer.Name, Equals, "Richard Roe")
	c.Assert(cfg.Committer.Email, Equals, "richard@example.com")
	c.Assert(cfg.Pack.Window, Equals, uint(20))
	c.Assert(cfg.Remotes, HasLen, 4)
	c.Assert(cfg.Remotes["origin"].Name, Equals, "origin")
	c.Assert(cfg.Remotes["origin"].URLs, DeepEquals, []string{"git@github.com:mcuadros/go-git.git"})
	c.Assert(cfg.Remotes["origin"].Fetch, DeepEquals, []RefSpec{"+refs/heads/*:refs/remotes/origin/*"})
	c.Assert(cfg.Remotes["alt"].Name, Equals, "alt")
	c.Assert(cfg.Remotes["alt"].URLs, DeepEquals, []string{"git@github.com:mcuadros/go-git.git", "git@github.com:src-d/go-git.git"})
	c.Assert(cfg.Remotes["alt"].Fetch, DeepEquals, []RefSpec{"+refs/heads/*:refs/remotes/origin/*", "+refs/pull/*:refs/remotes/origin/pull/*"})
	c.Assert(cfg.Remotes["win-local"].Name, Equals, "win-local")
	c.Assert(cfg.Remotes["win-local"].URLs, DeepEquals, []string{"X:\\Git\\"})
	c.Assert(cfg.Remotes["insteadOf"].URLs, DeepEquals, []string{"ssh://git@github.com/kostyay/go-git.git"})
	c.Assert(cfg.Submodules, HasLen, 1)
	c.Assert(cfg.Submodules["qux"].Name, Equals, "qux")
	c.Assert(cfg.Submodules["qux"].URL, Equals, "https://github.com/foo/qux.git")
	c.Assert(cfg.Submodules["qux"].Branch, Equals, "bar")
	c.Assert(cfg.Branches["master"].Remote, Equals, "origin")
	c.Assert(cfg.Branches["master"].Merge, Equals, plumbing.ReferenceName("refs/heads/master"))
	c.Assert(cfg.Init.DefaultBranch, Equals, "main")
}

func (s *ConfigSuite) TestMarshal(c *C) {
	output := []byte(`[core]
	bare = true
	worktree = bar
[pack]
	window = 20
[remote "alt"]
	url = git@github.com:mcuadros/go-git.git
	url = git@github.com:src-d/go-git.git
	fetch = +refs/heads/*:refs/remotes/origin/*
	fetch = +refs/pull/*:refs/remotes/origin/pull/*
[remote "insteadOf"]
	url = https://github.com/kostyay/go-git.git
[remote "origin"]
	url = git@github.com:mcuadros/go-git.git
[remote "win-local"]
	url = "X:\\Git\\"
[submodule "qux"]
	url = https://github.com/foo/qux.git
[branch "master"]
	remote = origin
	merge = refs/heads/master
[url "ssh://git@github.com/"]
	insteadOf = https://github.com/
[init]
	defaultBranch = main
`)

	cfg := NewConfig()
	cfg.Core.IsBare = true
	cfg.Core.Worktree = "bar"
	cfg.Pack.Window = 20
	cfg.Init.DefaultBranch = "main"
	cfg.Remotes["origin"] = &RemoteConfig{
		Name: "origin",
		URLs: []string{"git@github.com:mcuadros/go-git.git"},
	}

	cfg.Remotes["alt"] = &RemoteConfig{
		Name:  "alt",
		URLs:  []string{"git@github.com:mcuadros/go-git.git", "git@github.com:src-d/go-git.git"},
		Fetch: []RefSpec{"+refs/heads/*:refs/remotes/origin/*", "+refs/pull/*:refs/remotes/origin/pull/*"},
	}

	cfg.Remotes["win-local"] = &RemoteConfig{
		Name: "win-local",
		URLs: []string{"X:\\Git\\"},
	}

	cfg.Remotes["insteadOf"] = &RemoteConfig{
		Name: "insteadOf",
		URLs: []string{"https://github.com/kostyay/go-git.git"},
	}

	cfg.Submodules["qux"] = &Submodule{
		Name: "qux",
		URL:  "https://github.com/foo/qux.git",
	}

	cfg.Branches["master"] = &Branch{
		Name:   "master",
		Remote: "origin",
		Merge:  "refs/heads/master",
	}

	cfg.URLs["ssh://git@github.com/"] = &URL{
		Name:      "ssh://git@github.com/",
		InsteadOf: "https://github.com/",
	}

	b, err := cfg.Marshal()
	c.Assert(err, IsNil)

	c.Assert(string(b), Equals, string(output))
}

func (s *ConfigSuite) TestUnmarshalMarshal(c *C) {
	input := []byte(`[core]
	bare = true
	worktree = foo
	custom = ignored
[user]
	name = John Doe
	email = john@example.com
[author]
	name = Jane Roe
	email = jane@example.com
[committer]
	name = Richard Roe
	email = richard@example.co
[pack]
	window = 20
[remote "insteadOf"]
	url = https://github.com/kostyay/go-git.git
[remote "origin"]
	url = git@github.com:mcuadros/go-git.git
	fetch = +refs/heads/*:refs/remotes/origin/*
	mirror = true
[remote "win-local"]
	url = "X:\\Git\\"
[branch "master"]
	remote = origin
	merge = refs/heads/master
[url "ssh://git@github.com/"]
	insteadOf = https://github.com/
`)

	cfg := NewConfig()
	err := cfg.Unmarshal(input)
	c.Assert(err, IsNil)

	output, err := cfg.Marshal()
	c.Assert(err, IsNil)
	c.Assert(string(output), DeepEquals, string(input))
}

func (s *ConfigSuite) TestLoadConfigXDG(c *C) {
	cfg := NewConfig()
	cfg.User.Name = "foo"
	cfg.User.Email = "foo@foo.com"

	tmp, err := util.TempDir(osfs.Default, "", "test-commit-options")
	c.Assert(err, IsNil)
	defer util.RemoveAll(osfs.Default, tmp)

	err = osfs.Default.MkdirAll(filepath.Join(tmp, "git"), 0777)
	c.Assert(err, IsNil)

	os.Setenv("XDG_CONFIG_HOME", tmp)
	defer func() {
		os.Setenv("XDG_CONFIG_HOME", "")
	}()

	content, err := cfg.Marshal()
	c.Assert(err, IsNil)

	cfgFile := filepath.Join(tmp, "git/config")
	err = util.WriteFile(osfs.Default, cfgFile, content, 0777)
	c.Assert(err, IsNil)

	cfg, err = LoadConfig(GlobalScope)
	c.Assert(err, IsNil)

	c.Assert(cfg.User.Email, Equals, "foo@foo.com")
}

func (s *ConfigSuite) TestValidateConfig(c *C) {
	config := &Config{
		Remotes: map[string]*RemoteConfig{
			"bar": {
				Name: "bar",
				URLs: []string{"http://foo/bar"},
			},
		},
		Branches: map[string]*Branch{
			"bar": {
				Name: "bar",
			},
			"foo": {
				Name:   "foo",
				Remote: "origin",
				Merge:  plumbing.ReferenceName("refs/heads/foo"),
			},
		},
	}

	c.Assert(config.Validate(), IsNil)
}

func (s *ConfigSuite) TestValidateInvalidRemote(c *C) {
	config := &Config{
		Remotes: map[string]*RemoteConfig{
			"foo": {Name: "foo"},
		},
	}

	c.Assert(config.Validate(), Equals, ErrRemoteConfigEmptyURL)
}

func (s *ConfigSuite) TestValidateInvalidRemoteKey(c *C) {
	config := &Config{
		Remotes: map[string]*RemoteConfig{
			"bar": {Name: "foo"},
		},
	}

	c.Assert(config.Validate(), Equals, ErrInvalid)
}

func (s *ConfigSuite) TestRemoteConfigValidateMissingURL(c *C) {
	config := &RemoteConfig{Name: "foo"}
	c.Assert(config.Validate(), Equals, ErrRemoteConfigEmptyURL)
}

func (s *ConfigSuite) TestRemoteConfigValidateMissingName(c *C) {
	config := &RemoteConfig{}
	c.Assert(config.Validate(), Equals, ErrRemoteConfigEmptyName)
}

func (s *ConfigSuite) TestRemoteConfigValidateDefault(c *C) {
	config := &RemoteConfig{Name: "foo", URLs: []string{"http://foo/bar"}}
	c.Assert(config.Validate(), IsNil)

	fetch := config.Fetch
	c.Assert(fetch, HasLen, 1)
	c.Assert(fetch[0].String(), Equals, "+refs/heads/*:refs/remotes/foo/*")
}

func (s *ConfigSuite) TestValidateInvalidBranchKey(c *C) {
	config := &Config{
		Branches: map[string]*Branch{
			"foo": {
				Name:   "bar",
				Remote: "origin",
				Merge:  plumbing.ReferenceName("refs/heads/bar"),
			},
		},
	}

	c.Assert(config.Validate(), Equals, ErrInvalid)
}

func (s *ConfigSuite) TestValidateInvalidBranch(c *C) {
	config := &Config{
		Branches: map[string]*Branch{
			"bar": {
				Name:   "bar",
				Remote: "origin",
				Merge:  plumbing.ReferenceName("refs/heads/bar"),
			},
			"foo": {
				Name:   "foo",
				Remote: "origin",
				Merge:  plumbing.ReferenceName("baz"),
			},
		},
	}

	c.Assert(config.Validate(), Equals, errBranchInvalidMerge)
}

func (s *ConfigSuite) TestRemoteConfigDefaultValues(c *C) {
	config := NewConfig()

	c.Assert(config.Remotes, HasLen, 0)
	c.Assert(config.Branches, HasLen, 0)
	c.Assert(config.Submodules, HasLen, 0)
	c.Assert(config.Raw, NotNil)
	c.Assert(config.Pack.Window, Equals, DefaultPackWindow)
}

func (s *ConfigSuite) TestLoadConfigLocalScope(c *C) {
	cfg, err := LoadConfig(LocalScope)
	c.Assert(err, NotNil)
	c.Assert(cfg, IsNil)
}

func (s *ConfigSuite) TestRemoveUrlOptions(c *C) {
	buf := []byte(`
[remote "alt"]
	url = git@github.com:mcuadros/go-git.git
	url = git@github.com:src-d/go-git.git
	fetch = +refs/heads/*:refs/remotes/origin/*
	fetch = +refs/pull/*:refs/remotes/origin/pull/*`)

	cfg := NewConfig()
	err := cfg.Unmarshal(buf)
	c.Assert(err, IsNil)
	c.Assert(len(cfg.Remotes), Equals, 1)
	cfg.Remotes["alt"].URLs = []string{}

	buf, err = cfg.Marshal()
	if strings.Contains(string(buf), "url") {
		c.Fatal("conifg should not contain any url sections")
	}
}