package infra

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

func TestDotenvLoad(t *testing.T) {
	// helper to write a temp .env file
	writeEnv := func(t *testing.T, content string) string {
		t.Helper()
		dir := t.TempDir()
		p := filepath.Join(dir, ".env")
		if err := os.WriteFile(p, []byte(content), 0o600); err != nil {
			t.Fatal(err)
		}
		return p
	}

	t.Run("parsea KEY=VALUE y setea variable", func(t *testing.T) {
		p := writeEnv(t, "DOTENV_TEST_FOO=hello\n")
		t.Setenv("DOTENV_TEST_FOO", "") // ensure unset
		os.Unsetenv("DOTENV_TEST_FOO")

		if err := DotenvLoad(p); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got := os.Getenv("DOTENV_TEST_FOO"); got != "hello" {
			t.Errorf("expected DOTENV_TEST_FOO=hello, got %q", got)
		}
	})

	t.Run("ignora lineas comentario y vacias", func(t *testing.T) {
		content := "# this is a comment\n\nDOTENV_TEST_BAR=world\n"
		p := writeEnv(t, content)
		os.Unsetenv("DOTENV_TEST_BAR")

		if err := DotenvLoad(p); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got := os.Getenv("DOTENV_TEST_BAR"); got != "world" {
			t.Errorf("expected world, got %q", got)
		}
	})

	t.Run("no sobreescribe variables ya seteadas", func(t *testing.T) {
		p := writeEnv(t, "DOTENV_TEST_EXISTING=new\n")
		t.Setenv("DOTENV_TEST_EXISTING", "original")

		if err := DotenvLoad(p); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got := os.Getenv("DOTENV_TEST_EXISTING"); got != "original" {
			t.Errorf("expected original (not overwritten), got %q", got)
		}
	})

	t.Run("valores con comillas dobles se stripean", func(t *testing.T) {
		p := writeEnv(t, `DOTENV_TEST_QUOTED="quoted value"`)
		os.Unsetenv("DOTENV_TEST_QUOTED")

		if err := DotenvLoad(p); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got := os.Getenv("DOTENV_TEST_QUOTED"); got != "quoted value" {
			t.Errorf("expected 'quoted value', got %q", got)
		}
	})

	t.Run("valores con comillas simples se stripean", func(t *testing.T) {
		p := writeEnv(t, "DOTENV_TEST_SINGLE='single quoted'")
		os.Unsetenv("DOTENV_TEST_SINGLE")

		if err := DotenvLoad(p); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got := os.Getenv("DOTENV_TEST_SINGLE"); got != "single quoted" {
			t.Errorf("expected 'single quoted', got %q", got)
		}
	})

	t.Run("archivo inexistente retorna error", func(t *testing.T) {
		err := DotenvLoad("/nonexistent/.env.does.not.exist")
		if err == nil {
			t.Error("expected error for missing file")
		}
	})

	t.Run("linea sin signo igual retorna error", func(t *testing.T) {
		p := writeEnv(t, "INVALID_LINE\n")
		err := DotenvLoad(p)
		if err == nil {
			t.Error("expected error for line without '='")
		}
	})
}