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package main

import (
	"os"
	"path/filepath"
	"testing"

	"rickub.com/turbo-editors/turbo-core/app"
	"rickub.com/turbo-editors/turbo-core/settings"
	"rickub.com/turbo-editors/turbo-core/theme"

	"rickub.com/turbo-editors/turbo-go/internal/golang"
)

func TestTheProjectRootIsTheModuleRoot(t *testing.T) {
	// gopls is given the module's boundary, which is what decides the package
	// set it loads. The walk itself is turbo-core's; what is checked here is
	// that Turbo Go's profile asks it to look for a go.mod.
	root := t.TempDir()
	if err := os.WriteFile(filepath.Join(root, "go.mod"), []byte("module x\n"), 0o644); err != nil {
		t.Fatalf("writing go.mod: %v", err)
	}
	nested := filepath.Join(root, "internal", "deep")
	if err := os.MkdirAll(nested, 0o755); err != nil {
		t.Fatalf("creating the tree: %v", err)
	}
	file := filepath.Join(nested, "deep.go")
	if err := os.WriteFile(file, []byte("package deep\n"), 0o644); err != nil {
		t.Fatalf("writing the file: %v", err)
	}

	if got := app.ProjectRoot(golang.Profile(), []string{file}); got != root {
		t.Errorf("ProjectRoot() = %q, want the module root %q", got, root)
	}
}

func TestThemeNamePrefersTheFlagOverTheProject(t *testing.T) {
	got := themeName(options{theme: "borland-light"}, settings.Settings{Theme: "turbo-dark"})

	if got != "borland-light" {
		t.Errorf("themeName() = %q; an explicit -theme must win over the project's", got)
	}
}

func TestThemeNameUsesTheProjectWhenNoFlagWasGiven(t *testing.T) {
	got := themeName(options{}, settings.Settings{Theme: "turbo-dark"})

	if got != "turbo-dark" {
		t.Errorf("themeName() = %q, want the project's theme", got)
	}
}

func TestThemeNameFallsBackToTheDefault(t *testing.T) {
	got := themeName(options{}, settings.Settings{})

	if got != theme.DefaultName {
		t.Errorf("themeName() = %q, want %q", got, theme.DefaultName)
	}
}

func TestLoadProjectSettingsReadsTheWorkingDirectory(t *testing.T) {
	project := t.TempDir()
	t.Chdir(project)
	if err := os.MkdirAll(settings.Dir(golang.Profile(), project), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	contents := "[editor]\ntheme = \"turbo-dark\"\nautosave = true\n"
	if err := os.WriteFile(settings.Path(golang.Profile(), project), []byte(contents), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}

	_, loaded := loadProjectSettings(golang.Profile())

	if loaded.Theme != "turbo-dark" {
		t.Errorf("Theme = %q, want turbo-dark", loaded.Theme)
	}
	if !loaded.Autosave {
		t.Error("Autosave = false, want the file's true")
	}
}

func TestLoadProjectSettingsDoesNotWalkUpToAParent(t *testing.T) {
	// "The project is where you started the editor" is the rule; a settings
	// file one directory up belongs to a different project.
	parent := t.TempDir()
	if err := os.MkdirAll(settings.Dir(golang.Profile(), parent), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	if err := os.WriteFile(settings.Path(golang.Profile(), parent), []byte("[editor]\ntheme = \"turbo-dark\"\n"), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}
	child := filepath.Join(parent, "internal")
	if err := os.Mkdir(child, 0o755); err != nil {
		t.Fatalf("creating the child directory: %v", err)
	}
	t.Chdir(child)

	_, loaded := loadProjectSettings(golang.Profile())

	if loaded.Theme != "" {
		t.Errorf("Theme = %q; settings were read from a parent directory", loaded.Theme)
	}
}

func TestLoadProjectSettingsCarriesOnWithoutAFile(t *testing.T) {
	t.Chdir(t.TempDir())

	_, loaded := loadProjectSettings(golang.Profile())

	if loaded != settings.Default() {
		t.Errorf("loadProjectSettings(golang.Profile()) = %+v, want the defaults", loaded)
	}
}

func TestABrokenSettingsFileDoesNotStopTheEditor(t *testing.T) {
	// The editor is how you would fix the file, so it has to open.
	project := t.TempDir()
	t.Chdir(project)
	if err := os.MkdirAll(settings.Dir(golang.Profile(), project), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	if err := os.WriteFile(settings.Path(golang.Profile(), project), []byte("[editor\nnot toml"), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}

	_, loaded := loadProjectSettings(golang.Profile())

	if loaded != settings.Default() {
		t.Errorf("loadProjectSettings(golang.Profile()) = %+v, want the defaults", loaded)
	}
}