package config

import (
	"testing"

	pkgtel "scrabble/pkg/telemetry"
)

// setRequired sets the required connector variables (the bot token + the Mini App
// URL) so Load reaches the telemetry checks.
func setRequired(t *testing.T) {
	t.Helper()
	t.Setenv("TELEGRAM_BOT_TOKEN", "test-token")
	t.Setenv("TELEGRAM_MINIAPP_URL", "https://example.org/app")
}

// TestLoadBot verifies the bot parsing: the token is read and the game channel id is
// parsed when present.
func TestLoadBot(t *testing.T) {
	t.Setenv("TELEGRAM_MINIAPP_URL", "https://example.org/app")
	t.Setenv("TELEGRAM_BOT_TOKEN", "bot-token")
	t.Setenv("TELEGRAM_GAME_CHANNEL_ID", "-100111")
	c, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Token != "bot-token" || c.GameChannelID != -100111 {
		t.Errorf("config = token %q / channel %d, want bot-token / -100111", c.Token, c.GameChannelID)
	}
}

// TestLoadOptionalChannel verifies the game channel id defaults to 0 when unset.
func TestLoadOptionalChannel(t *testing.T) {
	setRequired(t)
	c, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.GameChannelID != 0 {
		t.Errorf("GameChannelID = %d, want 0", c.GameChannelID)
	}
}

// TestLoadRequiresBot verifies Load fails when no bot token is configured.
func TestLoadRequiresBot(t *testing.T) {
	t.Setenv("TELEGRAM_MINIAPP_URL", "https://example.org/app")
	if _, err := Load(); err == nil {
		t.Fatal("Load: expected an error when no bot token is set, got nil")
	}
}

// TestLoadTelemetryDefaults verifies the connector telemetry defaults: the
// "scrabble-telegram" service name and both exporters off.
func TestLoadTelemetryDefaults(t *testing.T) {
	setRequired(t)
	c, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Telemetry.ServiceName != "scrabble-telegram" {
		t.Errorf("Telemetry.ServiceName = %q, want scrabble-telegram", c.Telemetry.ServiceName)
	}
	if c.Telemetry.TracesExporter != pkgtel.ExporterNone || c.Telemetry.MetricsExporter != pkgtel.ExporterNone {
		t.Errorf("exporters = %q/%q, want none/none", c.Telemetry.TracesExporter, c.Telemetry.MetricsExporter)
	}
}

// TestLoadRejectsUnsupportedExporter verifies an exporter outside the supported
// set fails validation.
func TestLoadRejectsUnsupportedExporter(t *testing.T) {
	setRequired(t)
	t.Setenv("TELEGRAM_OTEL_TRACES_EXPORTER", "jaeger")
	if _, err := Load(); err == nil {
		t.Fatal("Load: expected an error for an unsupported exporter, got nil")
	}
}