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package main

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

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

	"rickub.com/turbo-editors/turbo-python/internal/pythonlang"
)

// Each of the three markers finds the root on its own, and the walk stops at
// the nearest directory holding any of them. pylsp is started there, and it is
// what decides the code the server loads.
func TestTheProjectRootIsFoundByAnyOfTheThreeMarkers(t *testing.T) {
	markers := map[string]string{
		"pyproject.toml": "[project]\nname = \"x\"\n",
		"setup.py":       "from setuptools import setup\n\nsetup()\n",
		"setup.cfg":      "[metadata]\nname = x\n",
	}

	for marker, contents := range markers {
		t.Run(marker, func(t *testing.T) {
			root := t.TempDir()
			writeFile(t, filepath.Join(root, marker), contents)
			file := filepath.Join(root, "src", "package", "deep.py")
			writeFile(t, file, "def f() -> None:\n    pass\n")

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

// A directory with none of the three is its own root: the walk must not climb
// past a project into whatever is above it.
func TestAFileInNoProjectIsItsOwnRoot(t *testing.T) {
	root := t.TempDir()
	file := filepath.Join(root, "script.py")
	writeFile(t, file, "print(1)\n")

	if got := app.ProjectRoot(pythonlang.Profile(), []string{file}); got != root {
		t.Errorf("ProjectRoot() = %q, want the file's own directory %q", got, root)
	}
}

// writeFile creates a file, making its directory first.
func writeFile(t *testing.T, path, contents string) {
	t.Helper()
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		t.Fatalf("creating %s: %v", filepath.Dir(path), err)
	}
	if err := os.WriteFile(path, []byte(contents), 0o644); err != nil {
		t.Fatalf("writing %s: %v", path, err)
	}
}

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(pythonlang.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(pythonlang.Profile(), project), []byte(contents), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}

	_, loaded := loadProjectSettings(pythonlang.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(pythonlang.Profile(), parent), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	if err := os.WriteFile(settings.Path(pythonlang.Profile(), parent), []byte("[editor]\ntheme = \"turbo-dark\"\n"), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}
	child := filepath.Join(parent, "src")
	if err := os.Mkdir(child, 0o755); err != nil {
		t.Fatalf("creating the child directory: %v", err)
	}
	t.Chdir(child)

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

	if loaded != settings.Default() {
		t.Errorf("loadProjectSettings(pythonlang.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(pythonlang.Profile(), project), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	if err := os.WriteFile(settings.Path(pythonlang.Profile(), project), []byte("[editor\nnot toml"), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}

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

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

func TestDescribeLoadNamesTheSourceAndEveryFile(t *testing.T) {
	got := describeLoad(configrepo.Result{
		Remote: "https://git.rickub.com/turbo-editors/configs.git",
		Ref:    "main",
		Dir:    "/work/.turbo-python",
		Files:  []string{"settings.toml", "tools.toml"},
	})

	want := "Copied /work/.turbo-python from https://git.rickub.com/turbo-editors/configs.git (main):\n  settings.toml\n  tools.toml\n"
	if got != want {
		t.Errorf("describeLoad() =\n%q\nwant\n%q", got, want)
	}
}

func TestDescribeLoadOmitsTheRefWhenTheDefaultBranchWasUsed(t *testing.T) {
	got := describeLoad(configrepo.Result{Remote: "r", Dir: "d"})

	if strings.Contains(got, "(") {
		t.Errorf("describeLoad() = %q, want no parenthesised ref", got)
	}
}

func TestLoadConfigLeavesAProjectThatHasAConfigurationAlone(t *testing.T) {
	// Checked before anything is fetched, so this needs neither git nor a
	// network: the project's own .turbo-python is a decision, not a default.
	project := t.TempDir()
	if err := os.MkdirAll(filepath.Join(project, ".turbo-python"), 0o755); err != nil {
		t.Fatal(err)
	}
	t.Chdir(project)

	err := loadConfig(pythonlang.Profile(), "https://rickub.com/turbo-editors/configs/tree/main/golang-init")

	if !errors.Is(err, configrepo.ErrExists) {
		t.Errorf("loadConfig() error = %v, want ErrExists", err)
	}
}