package config

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

func TestLoadLocalConfig(t *testing.T) {
	t.Parallel()

	cfg, err := Load(filepath.Join("..", "..", "config", "local.yaml"))
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}

	if cfg.App.Name != "chatappgateway" {
		t.Fatalf("unexpected app name: %s", cfg.App.Name)
	}
	if cfg.App.HTTPAddr != ":8080" {
		t.Fatalf("unexpected http addr: %s", cfg.App.HTTPAddr)
	}
	if len(cfg.GRPC.User.Targets) != 1 || cfg.GRPC.User.Targets[0] != "127.0.0.1:9001" {
		t.Fatalf("unexpected user targets: %#v", cfg.GRPC.User.Targets)
	}
	if cfg.GRPC.Pay.Timeout != 3*time.Second {
		t.Fatalf("unexpected pay timeout: %s", cfg.GRPC.Pay.Timeout)
	}
	if cfg.GRPC.User.Retry.MaxAttempts != 2 {
		t.Fatalf("unexpected retry attempts: %d", cfg.GRPC.User.Retry.MaxAttempts)
	}
}

func TestLoadCompatibilityTargetConfig(t *testing.T) {
	t.Parallel()

	path := filepath.Join(t.TempDir(), "compat.yaml")
	content := strings.TrimSpace(`
app:
  name: chatappgateway
  http_addr: ":8080"
grpc:
  user:
    target: "127.0.0.1:9001"
    timeout: 3s
  pay:
    target: "127.0.0.1:9002"
    timeout: 3s
`)
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatalf("WriteFile returned error: %v", err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if len(cfg.GRPC.User.Targets) != 1 || cfg.GRPC.User.Targets[0] != "127.0.0.1:9001" {
		t.Fatalf("unexpected user targets: %#v", cfg.GRPC.User.Targets)
	}
}

func TestLoadInvalidConfig(t *testing.T) {
	t.Parallel()

	path := filepath.Join(t.TempDir(), "invalid.yaml")
	content := strings.TrimSpace(`
app:
  name: chatappgateway
  http_addr: "bad-address"
grpc:
  user:
    targets: ["127.0.0.1:9001"]
    timeout: 3s
  pay:
    targets: ["127.0.0.1:9002"]
    timeout: 3s
`)
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatalf("WriteFile returned error: %v", err)
	}

	_, err := Load(path)
	if err == nil {
		t.Fatal("Load returned nil error")
	}
	if !strings.Contains(err.Error(), "app.http_addr is invalid") {
		t.Fatalf("unexpected error: %v", err)
	}
}

func TestLoadInvalidUpstream(t *testing.T) {
	t.Parallel()

	path := filepath.Join(t.TempDir(), "invalid-upstream.yaml")
	content := strings.TrimSpace(`
app:
  name: chatappgateway
  http_addr: ":8080"
grpc:
  user:
    targets: ["127.0.0.1:9001"]
    timeout: 3s
  pay:
    targets: ["invalid"]
    timeout: 3s
`)
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatalf("WriteFile returned error: %v", err)
	}

	_, err := Load(path)
	if err == nil {
		t.Fatal("Load returned nil error")
	}
	if !strings.Contains(err.Error(), `grpc.pay.targets contains invalid target "invalid"`) {
		t.Fatalf("unexpected error: %v", err)
	}
}