package config

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

func TestDataDir(t *testing.T) {
	ResetForTest()
	t.Setenv("DATA_DIR", "")
	// default should be data under cwd
	d := DataDir()
	if d == "" {
		t.Fatal("DataDir empty")
	}
	// once behavior: change env shouldn't affect without reset
	t.Setenv("DATA_DIR", "/tmp/should-not-affect")
	d2 := DataDir()
	if d != d2 {
		t.Error("DataDir ignored Once")
	}

	ResetForTest()
	t.Setenv("DATA_DIR", "/tmp/testdata123")
	d3 := DataDir()
	if d3 != "/tmp/testdata123" {
		t.Errorf("DATA_DIR override failed: got %s", d3)
	}
}

func TestResolve(t *testing.T) {
	ResetForTest()
	tmp := t.TempDir()
	t.Setenv("DATA_DIR", tmp)

	tests := []struct {
		sub      string
		wantBase string // suffix check
	}{
		{"db.bolt", filepath.Join(tmp, "db.bolt")},
		{"certs", filepath.Join(tmp, "certs")},
		{"logs", filepath.Join(tmp, "logs")},
		{"letsencrypt-acme-challenge", filepath.Join(tmp, "letsencrypt-acme-challenge")},
		{"www", filepath.Join(tmp, "www")},
		{"unknown", filepath.Join(tmp, "unknown")},
	}
	for _, tt := range tests {
		got := Resolve(tt.sub)
		if got != tt.wantBase {
			t.Errorf("Resolve(%q) = %q want %q", tt.sub, got, tt.wantBase)
		}
	}

	// override CERTS_DIR (uses as base + join sub per current impl)
	ResetForTest()
	certsBase := filepath.Join(tmp, "mycerts-base")
	t.Setenv("CERTS_DIR", certsBase)
	t.Setenv("DATA_DIR", tmp)
	wantCerts := filepath.Join(certsBase, "certs")
	if got := Resolve("certs"); got != wantCerts {
		t.Errorf("CERTS_DIR override: got %s want %s", got, wantCerts)
	}

	// WWW_DIR / HTML_DIR (special case returns dir directly; overrides conditioned on exact sub to avoid cross-contamination)
	ResetForTest()
	wwwDir := filepath.Join(tmp, "mywww")
	t.Setenv("WWW_DIR", wwwDir)
	if got := Resolve("www"); got != wwwDir {
		t.Errorf("WWW_DIR: got %s", got)
	}
	ResetForTest()
	htmlDir := filepath.Join(tmp, "myhtml")
	t.Setenv("HTML_DIR", htmlDir)
	if got := Resolve("html"); got != htmlDir {
		t.Errorf("HTML_DIR: got %s", got)
	}

	// mixed overrides: only HTML set should not affect Resolve("www") (falls to DATA_DIR/www); vice-versa
	// (explicitly clear the other *_DIR to counter t.Setenv lingering within one TestResolve func)
	ResetForTest()
	t.Setenv("WWW_DIR", "")
	t.Setenv("HTML_DIR", htmlDir)
	t.Setenv("DATA_DIR", tmp)
	if got := Resolve("www"); got != filepath.Join(tmp, "www") {
		t.Errorf("mixed: only HTML should not affect www: got %s", got)
	}
	ResetForTest()
	t.Setenv("HTML_DIR", "")
	t.Setenv("WWW_DIR", wwwDir)
	t.Setenv("DATA_DIR", tmp)
	if got := Resolve("html"); got != filepath.Join(tmp, "html") {
		t.Errorf("mixed: only WWW should not affect html: got %s", got)
	}

	// CHALLENGE_DIR (uses as base + join per impl)
	ResetForTest()
	chBase := filepath.Join(tmp, "ch-base")
	t.Setenv("CHALLENGE_DIR", chBase)
	wantCh := filepath.Join(chBase, "letsencrypt-acme-challenge")
	if got := Resolve("letsencrypt-acme-challenge"); got != wantCh {
		t.Errorf("CHALLENGE: got %s want %s", got, wantCh)
	}
}

func TestEnsureDataDirs(t *testing.T) {
	ResetForTest()
	tmp := t.TempDir()
	t.Setenv("DATA_DIR", tmp)

	if err := EnsureDataDirs(); err != nil {
		t.Fatalf("EnsureDataDirs: %v", err)
	}

	// verify layout
	dirs := []string{
		tmp,
		filepath.Join(tmp, "certs"),
		filepath.Join(tmp, "logs"),
		filepath.Join(tmp, "letsencrypt-acme-challenge"),
		filepath.Join(tmp, "www"),
		filepath.Join(tmp, "letsencrypt-acme-challenge", ".well-known", "acme-challenge"),
	}
	for _, d := range dirs {
		if fi, err := os.Stat(d); err != nil || !fi.IsDir() {
			t.Errorf("expected dir %s: %v", d, err)
		}
	}
}

func TestIsDevelopment(t *testing.T) {
	ResetForTest()
	t.Setenv("PROXY_MODE", "")
	if IsDevelopment() {
		t.Error("default should be production (not dev)")
	}

	t.Setenv("PROXY_MODE", "development")
	if !IsDevelopment() {
		t.Error("PROXY_MODE=development should be dev")
	}

	t.Setenv("PROXY_MODE", "dev")
	if !IsDevelopment() {
		t.Error("PROXY_MODE=dev should be dev")
	}

	t.Setenv("PROXY_MODE", "production")
	if IsDevelopment() {
		t.Error("PROXY_MODE=production should not be dev")
	}

	// case insensitive
	t.Setenv("PROXY_MODE", "DEVELOPMENT")
	if !IsDevelopment() {
		t.Error("case insensitive")
	}
}