package config

import (
	"testing"

	pkgtel "scrabble/pkg/telemetry"
)

// setBotRequired sets every required bot variable so LoadBot reaches the optional
// parsing and telemetry checks.
func setBotRequired(t *testing.T) {
	t.Helper()
	t.Setenv("TELEGRAM_BOT_TOKEN", "bot-token")
	t.Setenv("TELEGRAM_MINIAPP_URL", "https://example.org/app")
	t.Setenv("TELEGRAM_GATEWAY_ADDR", "gateway.example.org:9443")
	t.Setenv("TELEGRAM_BOTLINK_SERVER_NAME", "gateway.example.org")
	t.Setenv("TELEGRAM_BOTLINK_TLS_CERT", "/certs/bot.crt")
	t.Setenv("TELEGRAM_BOTLINK_TLS_KEY", "/certs/bot.key")
	t.Setenv("TELEGRAM_BOTLINK_TLS_CA", "/certs/ca.crt")
}

// TestLoadValidator verifies the validator reads the token, defaults its address
// and names its telemetry service.
func TestLoadValidator(t *testing.T) {
	t.Setenv("TELEGRAM_BOT_TOKEN", "secret")
	c, err := LoadValidator()
	if err != nil {
		t.Fatalf("LoadValidator: %v", err)
	}
	if c.Token != "secret" {
		t.Errorf("Token = %q, want secret", c.Token)
	}
	if c.GRPCAddr != defaultValidatorGRPCAddr {
		t.Errorf("GRPCAddr = %q, want %q", c.GRPCAddr, defaultValidatorGRPCAddr)
	}
	if c.Telemetry.ServiceName != "scrabble-telegram-validator" {
		t.Errorf("ServiceName = %q, want scrabble-telegram-validator", c.Telemetry.ServiceName)
	}
}

// TestLoadValidatorRequiresToken verifies the validator fails without a token.
func TestLoadValidatorRequiresToken(t *testing.T) {
	t.Setenv("TELEGRAM_BOT_TOKEN", "")
	if _, err := LoadValidator(); err == nil {
		t.Fatal("LoadValidator: expected an error without a token, got nil")
	}
}

// TestLoadBot verifies the bot parses the token, channel id and owns_updates and
// names its telemetry service.
func TestLoadBot(t *testing.T) {
	setBotRequired(t)
	t.Setenv("TELEGRAM_GAME_CHANNEL_ID", "-100111")
	c, err := LoadBot()
	if err != nil {
		t.Fatalf("LoadBot: %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)
	}
	if !c.OwnsUpdates {
		t.Error("OwnsUpdates = false, want true by default")
	}
	if c.SendRatePerSecond != defaultSendRatePerSecond {
		t.Errorf("SendRatePerSecond = %d, want %d", c.SendRatePerSecond, defaultSendRatePerSecond)
	}
	if c.Telemetry.ServiceName != "scrabble-telegram-bot" {
		t.Errorf("ServiceName = %q, want scrabble-telegram-bot", c.Telemetry.ServiceName)
	}
}

// TestLoadBotOwnsUpdatesOptOut verifies TELEGRAM_OWNS_UPDATES=false disables the
// long-poll ownership.
func TestLoadBotOwnsUpdatesOptOut(t *testing.T) {
	setBotRequired(t)
	t.Setenv("TELEGRAM_OWNS_UPDATES", "false")
	c, err := LoadBot()
	if err != nil {
		t.Fatalf("LoadBot: %v", err)
	}
	if c.OwnsUpdates {
		t.Error("OwnsUpdates = true, want false")
	}
}

// TestLoadBotRequired verifies LoadBot fails when a required variable is missing.
func TestLoadBotRequired(t *testing.T) {
	cases := []string{
		"TELEGRAM_BOT_TOKEN",
		"TELEGRAM_MINIAPP_URL",
		"TELEGRAM_GATEWAY_ADDR",
		"TELEGRAM_BOTLINK_SERVER_NAME",
		"TELEGRAM_BOTLINK_TLS_CERT",
	}
	for _, missing := range cases {
		t.Run(missing, func(t *testing.T) {
			setBotRequired(t)
			t.Setenv(missing, "")
			if _, err := LoadBot(); err == nil {
				t.Fatalf("LoadBot: expected an error without %s, got nil", missing)
			}
		})
	}
}

// TestLoadBotChatAndPromo verifies the moderated-chat id and the promo-bot
// configuration parse, the @-prefix is stripped from the username, and a promo token
// without a username/link is rejected.
func TestLoadBotChatAndPromo(t *testing.T) {
	t.Run("parsed", func(t *testing.T) {
		setBotRequired(t)
		t.Setenv("TELEGRAM_CHAT_ID", "-100222")
		t.Setenv("TELEGRAM_PROMO_BOT_TOKEN", "promo-token")
		t.Setenv("TELEGRAM_BOT_USERNAME", "@ScrabbleBot")
		t.Setenv("TELEGRAM_BOT_LINK", "https://telegram.me/ScrabbleBot/app")
		c, err := LoadBot()
		if err != nil {
			t.Fatalf("LoadBot: %v", err)
		}
		if c.ChatID != -100222 {
			t.Errorf("ChatID = %d, want -100222", c.ChatID)
		}
		if c.PromoBotToken != "promo-token" {
			t.Errorf("PromoBotToken = %q", c.PromoBotToken)
		}
		if c.BotUsername != "ScrabbleBot" {
			t.Errorf("BotUsername = %q, want the leading @ stripped", c.BotUsername)
		}
		if c.BotLinkURL != "https://telegram.me/ScrabbleBot/app" {
			t.Errorf("BotLinkURL = %q", c.BotLinkURL)
		}
	})

	t.Run("promo token requires username and link", func(t *testing.T) {
		setBotRequired(t)
		t.Setenv("TELEGRAM_PROMO_BOT_TOKEN", "promo-token")
		if _, err := LoadBot(); err == nil {
			t.Fatal("LoadBot: expected an error for a promo token without username/link")
		}
	})

	t.Run("disabled by default", func(t *testing.T) {
		setBotRequired(t)
		c, err := LoadBot()
		if err != nil {
			t.Fatalf("LoadBot: %v", err)
		}
		if c.PromoBotToken != "" || c.ChatID != 0 {
			t.Errorf("defaults: promo=%q chat=%d, want empty/0", c.PromoBotToken, c.ChatID)
		}
	})
}

// TestLoadBotSupportRelay verifies the support-relay chat id parses, the state
// directory defaults to /data, and the relay is disabled (chat id 0) by default.
func TestLoadBotSupportRelay(t *testing.T) {
	t.Run("parsed", func(t *testing.T) {
		setBotRequired(t)
		t.Setenv("TELEGRAM_SUPPORT_CHAT_ID", "-1001234567890")
		t.Setenv("TELEGRAM_SUPPORT_STATE_DIR", "/srv/state")
		c, err := LoadBot()
		if err != nil {
			t.Fatalf("LoadBot: %v", err)
		}
		if c.SupportChatID != -1001234567890 {
			t.Errorf("SupportChatID = %d, want -1001234567890", c.SupportChatID)
		}
		if c.SupportStateDir != "/srv/state" {
			t.Errorf("SupportStateDir = %q, want /srv/state", c.SupportStateDir)
		}
	})

	t.Run("defaults", func(t *testing.T) {
		setBotRequired(t)
		c, err := LoadBot()
		if err != nil {
			t.Fatalf("LoadBot: %v", err)
		}
		if c.SupportChatID != 0 {
			t.Errorf("SupportChatID = %d, want 0 (relay disabled)", c.SupportChatID)
		}
		if c.SupportStateDir != "/data" {
			t.Errorf("SupportStateDir = %q, want /data", c.SupportStateDir)
		}
	})

	t.Run("malformed chat id rejected", func(t *testing.T) {
		setBotRequired(t)
		t.Setenv("TELEGRAM_SUPPORT_CHAT_ID", "not-a-number")
		if _, err := LoadBot(); err == nil {
			t.Fatal("LoadBot: expected an error for a malformed support chat id, got nil")
		}
	})
}

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