package settings

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

func TestLoadOrderAndMerge(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("USERPROFILE", home)
	t.Setenv("VERAE_OPEN_ON_COMPLETE", "")
	if s, src := Load(); s.OpenOnComplete != OpenFolder || (src != "default" && src != MachinePath()) {
		t.Fatalf("default: %v %s", s, src)
	}
	p := UserPath("")
	_ = os.MkdirAll(filepath.Dir(p), 0o700)
	_ = os.WriteFile(p, []byte(`{"other":1}`), 0o600)
	if err := SetOpenOnComplete(p, "PDF"); err != nil {
		t.Fatal(err)
	}
	b, _ := os.ReadFile(p)
	if s, _ := Load(); s.OpenOnComplete != OpenPDF {
		t.Fatalf("user: %s", b)
	}
	if string(b) == "" || !contains(string(b), `"other": 1`) {
		t.Fatalf("unknown key lost: %s", b)
	}
	t.Setenv("VERAE_OPEN_ON_COMPLETE", "none")
	if s, src := Load(); s.OpenOnComplete != OpenNone || src != "env VERAE_OPEN_ON_COMPLETE" {
		t.Fatal(s, src)
	}
	if SetOpenOnComplete(p, "bogus") == nil {
		t.Fatal("want error")
	}
}

func contains(s, sub string) bool { return indexOf(s, sub) >= 0 }

func indexOf(s, sub string) int {
	for i := 0; i+len(sub) <= len(s); i++ {
		if s[i:i+len(sub)] == sub {
			return i
		}
	}
	return -1
}

func TestPromptAndLastDir(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("USERPROFILE", home)
	t.Setenv("VERAE_PROMPT_FOR_FILENAME", "")
	if s, _ := Load(); !s.Prompt() {
		t.Fatal("default must be true")
	}
	if err := SetPromptForFilename(UserPath(""), "false"); err != nil {
		t.Fatal(err)
	}
	if s, _ := Load(); s.Prompt() {
		t.Fatal("want false")
	}
	t.Setenv("VERAE_PROMPT_FOR_FILENAME", "1")
	if s, _ := Load(); !s.Prompt() {
		t.Fatal("env override")
	}
	if LastSaveDir() != "" {
		t.Fatal("no state yet")
	}
	_ = SetLastSaveDir(home)
	if LastSaveDir() != home {
		t.Fatal(LastSaveDir())
	}
}