package git_commands

import (
	"testing"

	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
	"github.com/jesseduffield/lazygit/pkg/config"
	"github.com/stretchr/testify/assert"
)

func TestCommitRewordCommit(t *testing.T) {
	type scenario struct {
		testName    string
		runner      *oscommands.FakeCmdObjRunner
		summary     string
		description string
	}
	scenarios := []scenario{
		{
			"Single line reword",
			oscommands.NewFakeRunner(t).ExpectGitArgs([]string{"commit", "--allow-empty", "--amend", "--only", "-m", "test"}, "", nil),
			"test",
			"",
		},
		{
			"Multi line reword",
			oscommands.NewFakeRunner(t).ExpectGitArgs([]string{"commit", "--allow-empty", "--amend", "--only", "-m", "test", "-m", "line 2\nline 3"}, "", nil),
			"test",
			"line 2\nline 3",
		},
	}
	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			instance := buildCommitCommands(commonDeps{runner: s.runner})

			assert.NoError(t, instance.RewordLastCommit(s.summary, s.description).Run())
			s.runner.CheckForMissingCalls()
		})
	}
}

func TestCommitResetToCommit(t *testing.T) {
	runner := oscommands.NewFakeRunner(t).
		ExpectGitArgs([]string{"reset", "--hard", "78976bc"}, "", nil)

	instance := buildCommitCommands(commonDeps{runner: runner})

	assert.NoError(t, instance.ResetToCommit("78976bc", "hard", []string{}))
	runner.CheckForMissingCalls()
}

func TestCommitCommitCmdObj(t *testing.T) {
	type scenario struct {
		testName             string
		summary              string
		description          string
		configSignoff        bool
		configSkipHookPrefix string
		expectedArgs         []string
	}

	scenarios := []scenario{
		{
			testName:             "Commit",
			summary:              "test",
			configSignoff:        false,
			configSkipHookPrefix: "",
			expectedArgs:         []string{"commit", "-m", "test"},
		},
		{
			testName:             "Commit with --no-verify flag",
			summary:              "WIP: test",
			configSignoff:        false,
			configSkipHookPrefix: "WIP",
			expectedArgs:         []string{"commit", "--no-verify", "-m", "WIP: test"},
		},
		{
			testName:             "Commit with multiline message",
			summary:              "line1",
			description:          "line2",
			configSignoff:        false,
			configSkipHookPrefix: "",
			expectedArgs:         []string{"commit", "-m", "line1", "-m", "line2"},
		},
		{
			testName:             "Commit with signoff",
			summary:              "test",
			configSignoff:        true,
			configSkipHookPrefix: "",
			expectedArgs:         []string{"commit", "--signoff", "-m", "test"},
		},
		{
			testName:             "Commit with signoff and no-verify",
			summary:              "WIP: test",
			configSignoff:        true,
			configSkipHookPrefix: "WIP",
			expectedArgs:         []string{"commit", "--no-verify", "--signoff", "-m", "WIP: test"},
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			userConfig := config.GetDefaultConfig()
			userConfig.Git.Commit.SignOff = s.configSignoff
			userConfig.Git.SkipHookPrefix = s.configSkipHookPrefix

			runner := oscommands.NewFakeRunner(t).ExpectGitArgs(s.expectedArgs, "", nil)
			instance := buildCommitCommands(commonDeps{userConfig: userConfig, runner: runner})

			assert.NoError(t, instance.CommitCmdObj(s.summary, s.description).Run())
			runner.CheckForMissingCalls()
		})
	}
}

func TestCommitCommitEditorCmdObj(t *testing.T) {
	type scenario struct {
		testName      string
		configSignoff bool
		expected      []string
	}

	scenarios := []scenario{
		{
			testName:      "Commit using editor",
			configSignoff: false,
			expected:      []string{"commit"},
		},
		{
			testName:      "Commit with --signoff",
			configSignoff: true,
			expected:      []string{"commit", "--signoff"},
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			userConfig := config.GetDefaultConfig()
			userConfig.Git.Commit.SignOff = s.configSignoff

			runner := oscommands.NewFakeRunner(t).ExpectGitArgs(s.expected, "", nil)
			instance := buildCommitCommands(commonDeps{userConfig: userConfig, runner: runner})

			assert.NoError(t, instance.CommitEditorCmdObj().Run())
			runner.CheckForMissingCalls()
		})
	}
}

func TestCommitCreateFixupCommit(t *testing.T) {
	type scenario struct {
		testName string
		hash     string
		runner   *oscommands.FakeCmdObjRunner
		test     func(error)
	}

	scenarios := []scenario{
		{
			testName: "valid case",
			hash:     "12345",
			runner: oscommands.NewFakeRunner(t).
				ExpectGitArgs([]string{"commit", "--fixup=12345"}, "", nil),
			test: func(err error) {
				assert.NoError(t, err)
			},
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			instance := buildCommitCommands(commonDeps{runner: s.runner})
			s.test(instance.CreateFixupCommit(s.hash))
			s.runner.CheckForMissingCalls()
		})
	}
}

func TestCommitCreateAmendCommit(t *testing.T) {
	type scenario struct {
		testName           string
		originalSubject    string
		newSubject         string
		newDescription     string
		includeFileChanges bool
		runner             *oscommands.FakeCmdObjRunner
	}

	scenarios := []scenario{
		{
			testName:           "subject only",
			originalSubject:    "original subject",
			newSubject:         "new subject",
			newDescription:     "",
			includeFileChanges: true,
			runner: oscommands.NewFakeRunner(t).
				ExpectGitArgs([]string{"commit", "-m", "amend! original subject", "-m", "new subject"}, "", nil),
		},
		{
			testName:           "subject and description",
			originalSubject:    "original subject",
			newSubject:         "new subject",
			newDescription:     "new description",
			includeFileChanges: true,
			runner: oscommands.NewFakeRunner(t).
				ExpectGitArgs([]string{"commit", "-m", "amend! original subject", "-m", "new subject\n\nnew description"}, "", nil),
		},
		{
			testName:           "without file changes",
			originalSubject:    "original subject",
			newSubject:         "new subject",
			newDescription:     "",
			includeFileChanges: false,
			runner: oscommands.NewFakeRunner(t).
				ExpectGitArgs([]string{"commit", "-m", "amend! original subject", "-m", "new subject", "--only", "--allow-empty"}, "", nil),
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			instance := buildCommitCommands(commonDeps{runner: s.runner})
			err := instance.CreateAmendCommit(s.originalSubject, s.newSubject, s.newDescription, s.includeFileChanges)
			assert.NoError(t, err)
			s.runner.CheckForMissingCalls()
		})
	}
}

func TestCommitShowCmdObj(t *testing.T) {
	type scenario struct {
		testName            string
		filterPath          string
		contextSize         uint64
		similarityThreshold int
		ignoreWhitespace    bool
		extDiffCmd          string
		expected            []string
	}

	scenarios := []scenario{
		{
			testName:            "Default case without filter path",
			filterPath:          "",
			contextSize:         3,
			similarityThreshold: 50,
			ignoreWhitespace:    false,
			extDiffCmd:          "",
			expected:            []string{"-C", "/path/to/worktree", "-c", "diff.noprefix=false", "show", "--no-ext-diff", "--submodule", "--color=always", "--unified=3", "--stat", "--decorate", "-p", "1234567890", "--find-renames=50%"},
		},
		{
			testName:            "Default case with filter path",
			filterPath:          "file.txt",
			contextSize:         3,
			similarityThreshold: 50,
			ignoreWhitespace:    false,
			extDiffCmd:          "",
			expected:            []string{"-C", "/path/to/worktree", "-c", "diff.noprefix=false", "show", "--no-ext-diff", "--submodule", "--color=always", "--unified=3", "--stat", "--decorate", "-p", "1234567890", "--find-renames=50%", "--", "file.txt"},
		},
		{
			testName:            "Show diff with custom context size",
			filterPath:          "",
			contextSize:         77,
			similarityThreshold: 50,
			ignoreWhitespace:    false,
			extDiffCmd:          "",
			expected:            []string{"-C", "/path/to/worktree", "-c", "diff.noprefix=false", "show", "--no-ext-diff", "--submodule", "--color=always", "--unified=77", "--stat", "--decorate", "-p", "1234567890", "--find-renames=50%"},
		},
		{
			testName:            "Show diff with custom similarity threshold",
			filterPath:          "",
			contextSize:         3,
			similarityThreshold: 33,
			ignoreWhitespace:    false,
			extDiffCmd:          "",
			expected:            []string{"-C", "/path/to/worktree", "-c", "diff.noprefix=false", "show", "--no-ext-diff", "--submodule", "--color=always", "--unified=3", "--stat", "--decorate", "-p", "1234567890", "--find-renames=33%"},
		},
		{
			testName:            "Show diff, ignoring whitespace",
			filterPath:          "",
			contextSize:         77,
			similarityThreshold: 50,
			ignoreWhitespace:    true,
			extDiffCmd:          "",
			expected:            []string{"-C", "/path/to/worktree", "-c", "diff.noprefix=false", "show", "--no-ext-diff", "--submodule", "--color=always", "--unified=77", "--stat", "--decorate", "-p", "1234567890", "--ignore-all-space", "--find-renames=50%"},
		},
		{
			testName:            "Show diff with external diff command",
			filterPath:          "",
			contextSize:         3,
			similarityThreshold: 50,
			ignoreWhitespace:    false,
			extDiffCmd:          "difft --color=always",
			expected:            []string{"-C", "/path/to/worktree", "-c", "diff.external=difft --color=always", "-c", "diff.noprefix=false", "show", "--ext-diff", "--submodule", "--color=always", "--unified=3", "--stat", "--decorate", "-p", "1234567890", "--find-renames=50%"},
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			userConfig := config.GetDefaultConfig()
			userConfig.Git.Paging.ExternalDiffCommand = s.extDiffCmd
			appState := &config.AppState{}
			appState.IgnoreWhitespaceInDiffView = s.ignoreWhitespace
			appState.DiffContextSize = s.contextSize
			appState.RenameSimilarityThreshold = s.similarityThreshold

			runner := oscommands.NewFakeRunner(t).ExpectGitArgs(s.expected, "", nil)
			repoPaths := RepoPaths{
				worktreePath: "/path/to/worktree",
			}
			instance := buildCommitCommands(commonDeps{userConfig: userConfig, appState: appState, runner: runner, repoPaths: &repoPaths})

			assert.NoError(t, instance.ShowCmdObj("1234567890", s.filterPath).Run())
			runner.CheckForMissingCalls()
		})
	}
}

func TestGetCommitMsg(t *testing.T) {
	type scenario struct {
		testName       string
		input          string
		expectedOutput string
	}
	scenarios := []scenario{
		{
			"empty",
			``,
			``,
		},
		{
			"no line breaks (single line)",
			`use generics to DRY up context code`,
			`use generics to DRY up context code`,
		},
		{
			"with line breaks",
			`Merge pull request #1750 from mark2185/fix-issue-template

'git-rev parse' should be 'git rev-parse'`,
			`Merge pull request #1750 from mark2185/fix-issue-template

'git-rev parse' should be 'git rev-parse'`,
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			instance := buildCommitCommands(commonDeps{
				runner: oscommands.NewFakeRunner(t).ExpectGitArgs([]string{"-c", "log.showsignature=false", "log", "--format=%B", "--max-count=1", "deadbeef"}, s.input, nil),
			})

			output, err := instance.GetCommitMessage("deadbeef")

			assert.NoError(t, err)

			assert.Equal(t, s.expectedOutput, output)
		})
	}
}

func TestGetCommitMessageFromHistory(t *testing.T) {
	type scenario struct {
		testName string
		runner   *oscommands.FakeCmdObjRunner
		test     func(string, error)
	}
	scenarios := []scenario{
		{
			"Empty message",
			oscommands.NewFakeRunner(t).ExpectGitArgs([]string{"log", "-1", "--skip=2", "--pretty=%H"}, "", nil).ExpectGitArgs([]string{"-c", "log.showsignature=false", "log", "--format=%B", "--max-count=1"}, "", nil),
			func(output string, err error) {
				assert.Error(t, err)
			},
		},
		{
			"Default case to retrieve a commit in history",
			oscommands.NewFakeRunner(t).ExpectGitArgs([]string{"log", "-1", "--skip=2", "--pretty=%H"}, "hash3 \n", nil).ExpectGitArgs([]string{"-c", "log.showsignature=false", "log", "--format=%B", "--max-count=1", "hash3"}, `use generics to DRY up context code`, nil),
			func(output string, err error) {
				assert.NoError(t, err)
				assert.Equal(t, "use generics to DRY up context code", output)
			},
		},
	}

	for _, s := range scenarios {
		t.Run(s.testName, func(t *testing.T) {
			instance := buildCommitCommands(commonDeps{runner: s.runner})

			output, err := instance.GetCommitMessageFromHistory(2)

			s.test(output, err)
		})
	}
}

func TestAddCoAuthorToMessage(t *testing.T) {
	scenarios := []struct {
		name           string
		message        string
		expectedResult string
	}{
		{
			// This never happens, I think it isn't possible to create a commit
			// with an empty message. Just including it for completeness.
			name:           "Empty message",
			message:        "",
			expectedResult: "\n\nCo-authored-by: John Doe <john@doe.com>",
		},
		{
			name:           "Just a subject, no body",
			message:        "Subject",
			expectedResult: "Subject\n\nCo-authored-by: John Doe <john@doe.com>",
		},
		{
			name:           "Subject and body",
			message:        "Subject\n\nBody",
			expectedResult: "Subject\n\nBody\n\nCo-authored-by: John Doe <john@doe.com>",
		},
		{
			name:           "Body already ending with a Co-authored-by line",
			message:        "Subject\n\nBody\n\nCo-authored-by: Jane Smith <jane@smith.com>",
			expectedResult: "Subject\n\nBody\n\nCo-authored-by: Jane Smith <jane@smith.com>\nCo-authored-by: John Doe <john@doe.com>",
		},
	}
	for _, s := range scenarios {
		t.Run(s.name, func(t *testing.T) {
			result := AddCoAuthorToMessage(s.message, "John Doe <john@doe.com>")
			assert.Equal(t, s.expectedResult, result)
		})
	}
}

func TestAddCoAuthorToDescription(t *testing.T) {
	scenarios := []struct {
		name           string
		description    string
		expectedResult string
	}{
		{
			name:           "Empty description",
			description:    "",
			expectedResult: "Co-authored-by: John Doe <john@doe.com>",
		},
		{
			name:           "Non-empty description",
			description:    "Body",
			expectedResult: "Body\n\nCo-authored-by: John Doe <john@doe.com>",
		},
		{
			name:           "Description already ending with a Co-authored-by line",
			description:    "Body\n\nCo-authored-by: Jane Smith <jane@smith.com>",
			expectedResult: "Body\n\nCo-authored-by: Jane Smith <jane@smith.com>\nCo-authored-by: John Doe <john@doe.com>",
		},
	}
	for _, s := range scenarios {
		t.Run(s.name, func(t *testing.T) {
			result := AddCoAuthorToDescription(s.description, "John Doe <john@doe.com>")
			assert.Equal(t, s.expectedResult, result)
		})
	}
}
