package config

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

func resetRuntime(t *testing.T) {
	t.Helper()
	runtimeMu.Lock()
	runtimeStore = map[string]string{}
	runtimeMu.Unlock()
	os.Unsetenv("CONFIG_PATH")
	os.Unsetenv("MATOMO_URL")
	os.Unsetenv("MATOMO_SITE_ID")
	os.Unsetenv("HLS_SEGMENT_DURATION")
	os.Unsetenv("HLS_WINDOW_SIZE")
}

func TestConfigPath(t *testing.T) {
	resetRuntime(t)
	if got := ConfigPath(); got != "/app/playlist/config.json" {
		t.Errorf("ConfigPath() = %q, want default /app/playlist/config.json", got)
	}

	os.Setenv("CONFIG_PATH", "/tmp/custom.json")
	defer os.Unsetenv("CONFIG_PATH")
	if got := ConfigPath(); got != "/tmp/custom.json" {
		t.Errorf("ConfigPath() = %q, want /tmp/custom.json", got)
	}
}

func TestGetSetRuntime(t *testing.T) {
	resetRuntime(t)
	if _, ok := GetRuntime("foo"); ok {
		t.Errorf("expected missing key")
	}
	SetRuntime("foo", "bar")
	v, ok := GetRuntime("foo")
	if !ok || v != "bar" {
		t.Errorf("GetRuntime() = %q, %v; want bar, true", v, ok)
	}
}

func TestGettersDefaults(t *testing.T) {
	resetRuntime(t)
	if got := MatomoURL(); got != "" {
		t.Errorf("MatomoURL() = %q, want empty", got)
	}
	if got := MatomoSiteID(); got != "" {
		t.Errorf("MatomoSiteID() = %q, want empty", got)
	}
	if got := HLSSegmentDuration(); got != 2 {
		t.Errorf("HLSSegmentDuration() = %d, want 2", got)
	}
	if got := HLSWindowSize(); got != 12 {
		t.Errorf("HLSWindowSize() = %d, want 12", got)
	}
}

func TestGettersEnvFallback(t *testing.T) {
	resetRuntime(t)
	os.Setenv("HLS_SEGMENT_DURATION", "4")
	os.Setenv("HLS_WINDOW_SIZE", "30")
	os.Setenv("MATOMO_URL", "https://analytics.example.com")
	os.Setenv("MATOMO_SITE_ID", "7")

	if got := HLSSegmentDuration(); got != 4 {
		t.Errorf("HLSSegmentDuration() = %d, want 4", got)
	}
	if got := HLSWindowSize(); got != 30 {
		t.Errorf("HLSWindowSize() = %d, want 30", got)
	}
	if got := MatomoURL(); got != "https://analytics.example.com" {
		t.Errorf("MatomoURL() = %q", got)
	}
	if got := MatomoSiteID(); got != "7" {
		t.Errorf("MatomoSiteID() = %q", got)
	}
}

func TestLoadRuntimeConfigSeedsFromEnv(t *testing.T) {
	resetRuntime(t)
	dir := t.TempDir()
	os.Setenv("CONFIG_PATH", filepath.Join(dir, "config.json"))
	os.Setenv("HLS_SEGMENT_DURATION", "8")

	if err := LoadRuntimeConfig(); err != nil {
		t.Fatalf("LoadRuntimeConfig error: %v", err)
	}
	if got := HLSSegmentDuration(); got != 8 {
		t.Errorf("HLSSegmentDuration() = %d, want 8 (seeded from env)", got)
	}
}

func TestSaveAndLoadRuntimeConfig(t *testing.T) {
	resetRuntime(t)
	dir := t.TempDir()
	os.Setenv("CONFIG_PATH", filepath.Join(dir, "config.json"))

	if err := SetHLSSegmentDuration(5); err != nil {
		t.Fatal(err)
	}
	if err := SetHLSWindowSize(30); err != nil {
		t.Fatal(err)
	}
	if err := SetMatomoURL("https://stats.example.com"); err != nil {
		t.Fatal(err)
	}
	if err := SetMatomoSiteID("42"); err != nil {
		t.Fatal(err)
	}

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

	// Reset the store and reload from disk.
	runtimeMu.Lock()
	runtimeStore = map[string]string{}
	runtimeMu.Unlock()

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

	if got := HLSSegmentDuration(); got != 5 {
		t.Errorf("HLSSegmentDuration() = %d, want 5", got)
	}
	if got := HLSWindowSize(); got != 30 {
		t.Errorf("HLSWindowSize() = %d, want 30", got)
	}
	if got := MatomoURL(); got != "https://stats.example.com" {
		t.Errorf("MatomoURL() = %q", got)
	}
	if got := MatomoSiteID(); got != "42" {
		t.Errorf("MatomoSiteID() = %q", got)
	}
}

func TestSettersValidation(t *testing.T) {
	resetRuntime(t)

	if err := SetHLSSegmentDuration(1); err == nil {
		t.Error("expected error for duration 1")
	}
	if err := SetHLSSegmentDuration(20); err == nil {
		t.Error("expected error for duration 20")
	}
	if err := SetHLSSegmentDuration(6); err != nil {
		t.Errorf("unexpected error for duration 6: %v", err)
	}

	if err := SetHLSWindowSize(2); err == nil {
		t.Error("expected error for window 2")
	}
	if err := SetHLSWindowSize(101); err == nil {
		t.Error("expected error for window 101")
	}
	if err := SetHLSWindowSize(24); err != nil {
		t.Errorf("unexpected error for window 24: %v", err)
	}

	if err := SetMatomoURL("not-a-url"); err == nil {
		t.Error("expected error for invalid URL")
	}
	if err := SetMatomoURL("ftp://example.com"); err == nil {
		t.Error("expected error for non-http URL")
	}
	if err := SetMatomoURL("https://stats.example.com"); err != nil {
		t.Errorf("unexpected error for valid URL: %v", err)
	}

	if err := SetMatomoSiteID("abc"); err == nil {
		t.Error("expected error for non-numeric site ID")
	}
	if err := SetMatomoSiteID("99"); err != nil {
		t.Errorf("unexpected error for numeric site ID: %v", err)
	}
}