package config

import (
	"os"
	"testing"
	"time"
)

func TestConfigValidate(t *testing.T) {
	tests := []struct {
		name    string
		cfg     Config
		wantErr bool
	}{
		{
			name: "valid config",
			cfg: Config{
				TodoistAPIKey: "todoist-key",
				TrelloAPIKey:  "trello-key",
				TrelloToken:   "trello-token",
			},
			wantErr: false,
		},
		{
			name: "missing todoist key",
			cfg: Config{
				TrelloAPIKey: "trello-key",
				TrelloToken:  "trello-token",
			},
			wantErr: true,
		},
		{
			name: "missing trello key",
			cfg: Config{
				TodoistAPIKey: "todoist-key",
				TrelloToken:   "trello-token",
			},
			wantErr: true,
		},
		{
			name: "missing trello token",
			cfg: Config{
				TodoistAPIKey: "todoist-key",
				TrelloAPIKey:  "trello-key",
			},
			wantErr: true,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			err := tc.cfg.Validate()
			if (err != nil) != tc.wantErr {
				t.Errorf("Validate() error = %v, wantErr %v", err, tc.wantErr)
			}
		})
	}
}

func TestConfigHasMethods(t *testing.T) {
	cfg := Config{
		PlanToEatAPIKey:       "pte-key",
		TrelloAPIKey:          "trello-key",
		TrelloToken:           "trello-token",
		GoogleCredentialsFile: "/path/to/creds.json",
		GoogleTasksListID:     "@default",
	}

	if !cfg.HasPlanToEat() {
		t.Error("HasPlanToEat should return true")
	}

	if !cfg.HasTrello() {
		t.Error("HasTrello should return true")
	}

	if !cfg.HasGoogleCalendar() {
		t.Error("HasGoogleCalendar should return true")
	}

	if !cfg.HasGoogleTasks() {
		t.Error("HasGoogleTasks should return true")
	}

	// Test with empty config
	emptyCfg := Config{}
	if emptyCfg.HasPlanToEat() {
		t.Error("HasPlanToEat should return false for empty config")
	}
	if emptyCfg.HasTrello() {
		t.Error("HasTrello should return false for empty config")
	}
	if emptyCfg.HasGoogleCalendar() {
		t.Error("HasGoogleCalendar should return false for empty config")
	}
	if emptyCfg.HasGoogleTasks() {
		t.Error("HasGoogleTasks should return false for empty config")
	}

	// Test session check
	sessionCfg := Config{PlanToEatSession: "session-cookie"}
	if !sessionCfg.HasPlanToEat() {
		t.Error("HasPlanToEat should return true for session")
	}
	if !sessionCfg.HasPlanToEatSession() {
		t.Error("HasPlanToEatSession should return true")
	}
}

func TestGetEnvWithDefault(t *testing.T) {
	// Test with set env var
	os.Setenv("TEST_CONFIG_VAR", "test_value")
	defer os.Unsetenv("TEST_CONFIG_VAR")

	if val := getEnvWithDefault("TEST_CONFIG_VAR", "default"); val != "test_value" {
		t.Errorf("Expected 'test_value', got '%s'", val)
	}

	// Test with unset env var
	if val := getEnvWithDefault("UNSET_CONFIG_VAR", "default"); val != "default" {
		t.Errorf("Expected 'default', got '%s'", val)
	}
}

func TestGetEnvAsInt(t *testing.T) {
	// Test with valid int
	os.Setenv("TEST_INT_VAR", "42")
	defer os.Unsetenv("TEST_INT_VAR")

	if val := getEnvAsInt("TEST_INT_VAR", 10); val != 42 {
		t.Errorf("Expected 42, got %d", val)
	}

	// Test with invalid int
	os.Setenv("TEST_INVALID_INT", "not_a_number")
	defer os.Unsetenv("TEST_INVALID_INT")

	if val := getEnvAsInt("TEST_INVALID_INT", 10); val != 10 {
		t.Errorf("Expected default 10 for invalid int, got %d", val)
	}

	// Test with unset var
	if val := getEnvAsInt("UNSET_INT_VAR", 10); val != 10 {
		t.Errorf("Expected default 10, got %d", val)
	}
}

func TestGetEnvAsBool(t *testing.T) {
	// Test with true values
	os.Setenv("TEST_BOOL_TRUE", "true")
	defer os.Unsetenv("TEST_BOOL_TRUE")

	if val := getEnvAsBool("TEST_BOOL_TRUE", false); !val {
		t.Error("Expected true")
	}

	// Test with false values
	os.Setenv("TEST_BOOL_FALSE", "false")
	defer os.Unsetenv("TEST_BOOL_FALSE")

	if val := getEnvAsBool("TEST_BOOL_FALSE", true); val {
		t.Error("Expected false")
	}

	// Test with invalid bool
	os.Setenv("TEST_INVALID_BOOL", "maybe")
	defer os.Unsetenv("TEST_INVALID_BOOL")

	if val := getEnvAsBool("TEST_INVALID_BOOL", true); !val {
		t.Error("Expected default true for invalid bool")
	}

	// Test with unset var
	if val := getEnvAsBool("UNSET_BOOL_VAR", true); !val {
		t.Error("Expected default true")
	}
}

// Timezone tests
func TestGetDisplayTimezone(t *testing.T) {
	// Before SetDisplayTimezone is called, should return UTC
	loc := GetDisplayTimezone()
	if loc == nil {
		t.Fatal("GetDisplayTimezone should not return nil")
	}
}

func TestNow(t *testing.T) {
	now := Now()
	// Just verify it returns a valid time
	if now.IsZero() {
		t.Error("Now() should not return zero time")
	}
}

func TestToday(t *testing.T) {
	today := Today()

	// Today should have zero hours, minutes, seconds
	if today.Hour() != 0 || today.Minute() != 0 || today.Second() != 0 {
		t.Error("Today() should return midnight")
	}
}

func TestParseDateInDisplayTZ(t *testing.T) {
	parsed, err := ParseDateInDisplayTZ("2024-01-15")
	if err != nil {
		t.Fatalf("ParseDateInDisplayTZ failed: %v", err)
	}

	if parsed.Year() != 2024 || parsed.Month() != time.January || parsed.Day() != 15 {
		t.Errorf("Unexpected date: %v", parsed)
	}

	// Test invalid date
	_, err = ParseDateInDisplayTZ("invalid")
	if err == nil {
		t.Error("Expected error for invalid date")
	}
}

func TestParseDateTimeInDisplayTZ(t *testing.T) {
	parsed, err := ParseDateTimeInDisplayTZ("2006-01-02 15:04", "2024-01-15 14:30")
	if err != nil {
		t.Fatalf("ParseDateTimeInDisplayTZ failed: %v", err)
	}

	if parsed.Hour() != 14 || parsed.Minute() != 30 {
		t.Errorf("Unexpected time: %v", parsed)
	}
}

func TestToDisplayTZ(t *testing.T) {
	utcTime := time.Date(2024, 1, 15, 12, 0, 0, 0, time.UTC)
	converted := ToDisplayTZ(utcTime)

	// Just verify it doesn't panic and returns a valid time
	if converted.IsZero() {
		t.Error("ToDisplayTZ should not return zero time")
	}
}

func TestLoad(t *testing.T) {
	// Set up required env vars
	os.Setenv("TODOIST_API_KEY", "test-todoist-key")
	os.Setenv("TRELLO_API_KEY", "test-trello-key")
	os.Setenv("TRELLO_TOKEN", "test-trello-token")
	os.Setenv("PORT", "9999")
	os.Setenv("CACHE_TTL_MINUTES", "10")
	os.Setenv("DEBUG", "true")
	defer func() {
		os.Unsetenv("TODOIST_API_KEY")
		os.Unsetenv("TRELLO_API_KEY")
		os.Unsetenv("TRELLO_TOKEN")
		os.Unsetenv("PORT")
		os.Unsetenv("CACHE_TTL_MINUTES")
		os.Unsetenv("DEBUG")
	}()

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}

	if cfg.TodoistAPIKey != "test-todoist-key" {
		t.Errorf("Expected TodoistAPIKey 'test-todoist-key', got '%s'", cfg.TodoistAPIKey)
	}
	if cfg.Port != "9999" {
		t.Errorf("Expected Port '9999', got '%s'", cfg.Port)
	}
	if cfg.CacheTTLMinutes != 10 {
		t.Errorf("Expected CacheTTLMinutes 10, got %d", cfg.CacheTTLMinutes)
	}
	if !cfg.Debug {
		t.Error("Expected Debug to be true")
	}
}

func TestConfig_ClaudomatorURL_Default(t *testing.T) {
	os.Unsetenv("CLAUDOMATOR_URL")
	os.Setenv("TODOIST_API_KEY", "test-todoist-key")
	os.Setenv("TRELLO_API_KEY", "test-trello-key")
	os.Setenv("TRELLO_TOKEN", "test-trello-token")
	defer func() {
		os.Unsetenv("TODOIST_API_KEY")
		os.Unsetenv("TRELLO_API_KEY")
		os.Unsetenv("TRELLO_TOKEN")
	}()

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}
	if cfg.ClaudomatorURL != "http://127.0.0.1:8484" {
		t.Errorf("Expected default ClaudomatorURL 'http://127.0.0.1:8484', got '%s'", cfg.ClaudomatorURL)
	}
}

func TestConfig_ClaudomatorURL_EnvOverride(t *testing.T) {
	os.Setenv("CLAUDOMATOR_URL", "http://1.2.3.4:9000")
	os.Setenv("TODOIST_API_KEY", "test-todoist-key")
	os.Setenv("TRELLO_API_KEY", "test-trello-key")
	os.Setenv("TRELLO_TOKEN", "test-trello-token")
	defer func() {
		os.Unsetenv("CLAUDOMATOR_URL")
		os.Unsetenv("TODOIST_API_KEY")
		os.Unsetenv("TRELLO_API_KEY")
		os.Unsetenv("TRELLO_TOKEN")
	}()

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}
	if cfg.ClaudomatorURL != "http://1.2.3.4:9000" {
		t.Errorf("Expected ClaudomatorURL 'http://1.2.3.4:9000', got '%s'", cfg.ClaudomatorURL)
	}
}

func TestLoad_ValidationError(t *testing.T) {
	// Clear required env vars to trigger validation error
	os.Unsetenv("TODOIST_API_KEY")
	os.Unsetenv("TRELLO_API_KEY")
	os.Unsetenv("TRELLO_TOKEN")

	_, err := Load()
	if err == nil {
		t.Error("Expected validation error when required env vars are missing")
	}
}