package router

import (
	"context"
	"errors"
	"testing"

	config "cloud.campbellwireless.net/git/barkstack/barkfile-parser"
)

func TestStaticResolverRoutesCaseInsensitiveHostnames(t *testing.T) {
	resolver, err := NewStaticResolver([]config.DatabaseConfig{
		{Name: "foo", Hostname: "foo.pawsql.barkstack.dev", Upstream: "postgres-foo:5432"},
		{Name: "bar", Hostname: "bar.pawsql.barkstack.dev", Upstream: "postgres-bar:5432"},
	})
	if err != nil {
		t.Fatalf("NewStaticResolver() error = %v", err)
	}
	for _, test := range []struct{ hostname, name, address string }{
		{"FOO.pawsql.barkstack.dev", "foo", "postgres-foo:5432"},
		{"bar.pawsql.barkstack.dev", "bar", "postgres-bar:5432"},
	} {
		backend, err := resolver.Resolve(context.Background(), test.hostname)
		if err != nil {
			t.Errorf("Resolve(%q) error = %v", test.hostname, err)
			continue
		}
		if backend.DatabaseName != test.name || backend.Address != test.address {
			t.Errorf("Resolve(%q) = %#v", test.hostname, backend)
		}
	}
}

func TestStaticResolverRejectsUnknownHostname(t *testing.T) {
	resolver, err := NewStaticResolver([]config.DatabaseConfig{{Name: "foo", Hostname: "foo.pawsql.barkstack.dev", Upstream: "postgres-foo:5432"}})
	if err != nil {
		t.Fatal(err)
	}
	_, err = resolver.Resolve(context.Background(), "unknown.pawsql.barkstack.dev")
	if !errors.Is(err, ErrUnknownHostname) {
		t.Errorf("Resolve() error = %v, want ErrUnknownHostname", err)
	}
}

func TestStaticResolverRoutesConfiguredDatabase(t *testing.T) {
	resolver, err := NewStaticResolver([]config.DatabaseConfig{
		{Name: "analytics", Upstream: "postgres-shared:5432"},
		{Name: "app", Hostname: "app.pawsql.barkstack.dev", Upstream: "postgres-shared:5432"},
	})
	if err != nil {
		t.Fatal(err)
	}
	backend, err := resolver.ResolveDatabase(context.Background(), "analytics")
	if err != nil {
		t.Fatal(err)
	}
	if backend.DatabaseName != "analytics" || backend.Address != "postgres-shared:5432" {
		t.Errorf("ResolveDatabase() = %#v", backend)
	}
	_, err = resolver.ResolveDatabase(context.Background(), "unknown")
	if !errors.Is(err, ErrUnknownDatabase) {
		t.Errorf("ResolveDatabase() error = %v, want ErrUnknownDatabase", err)
	}
}