package config

import (
	"errors"
	"log/slog"
	"strings"
	"testing"
)

func TestLoadRequiresTheToken(t *testing.T) {
	t.Setenv(EnvToken, "")
	if _, err := Load(); !errors.Is(err, ErrMissingToken) {
		t.Fatalf("Load error = %v, want ErrMissingToken", err)
	}
}

func TestLoadDefaults(t *testing.T) {
	t.Setenv(EnvToken, "424242:not-a-real-token")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.CepisBaseURL != "https://cep.is" {
		t.Fatalf("base URL = %q", cfg.CepisBaseURL)
	}
	if cfg.TelegramAPIBaseURL != "https://api.telegram.org" {
		t.Fatalf("telegram base URL = %q", cfg.TelegramAPIBaseURL)
	}
	if cfg.LogLevel != slog.LevelInfo {
		t.Fatalf("log level = %v", cfg.LogLevel)
	}
}

func TestLoadOverrides(t *testing.T) {
	t.Setenv(EnvToken, "424242:not-a-real-token")
	t.Setenv(EnvCepisBaseURL, "http://localhost:8080/")
	t.Setenv(EnvTelegramAPIBaseURL, "http://127.0.0.1:9000/")
	t.Setenv(EnvLogLevel, "debug")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.CepisBaseURL != "http://localhost:8080" {
		t.Fatalf("base URL = %q, the trailing slash should be gone", cfg.CepisBaseURL)
	}
	if cfg.TelegramAPIBaseURL != "http://127.0.0.1:9000" {
		t.Fatalf("telegram base URL = %q", cfg.TelegramAPIBaseURL)
	}
	if cfg.LogLevel != slog.LevelDebug {
		t.Fatalf("log level = %v", cfg.LogLevel)
	}
}

func TestLoadRejectsAnUnknownLogLevel(t *testing.T) {
	t.Setenv(EnvToken, "424242:not-a-real-token")
	t.Setenv(EnvLogLevel, "verbose")

	if _, err := Load(); err == nil {
		t.Fatal("an unknown log level should be an error")
	}
}

func TestLogValueRedactsTheToken(t *testing.T) {
	cfg := Defaults()
	cfg.Token = "424242:not-a-real-token"

	rendered := cfg.LogValue().String()
	if strings.Contains(rendered, cfg.Token) {
		t.Fatalf("the token leaked into the log value: %s", rendered)
	}
	if !strings.Contains(rendered, "token_set=true") {
		t.Fatalf("log value = %s", rendered)
	}
}