package config

import (
	"strings"
	"testing"
	"time"
)

func TestUnifiedEnvAliases(t *testing.T) {
	type project struct {
		Server Config `json:"server"`
		Label  string `json:"label"`
	}
	base := project{Server: Default(), Label: "base"}
	for _, policy := range []string{"allow", "ignore", "reject"} {
		t.Run(policy, func(t *testing.T) {
			env := map[string]string{"TEST_HTTP_ADDR": "127.0.0.1:8099", "TEST_LOG_SERVICE": "", "TEST_SERVICE": "", "TEST_LABEL": ""}
			opts := EnvOptions{Prefix: "TEST_", Empty: policy, Aliases: ServerEnvAliases("TEST_", "server"), Lookup: func(k string) (string, bool) { v, ok := env[k]; return v, ok }}
			got, err := OverlayEnv(base, opts)
			if policy == "reject" {
				if err == nil || !strings.Contains(err.Error(), "empty") {
					t.Fatal(err)
				}
				return
			}
			if err != nil {
				t.Fatal(err)
			}
			if got.Server.Address != "127.0.0.1:8099" {
				t.Fatal("alias ignored")
			}
			if policy == "allow" && got.Label != "" || policy == "ignore" && got.Label != "base" {
				t.Fatal("empty policy differs")
			}
			env["TEST_SERVER_ADDRESS"] = "127.0.0.1:9001"
			env["TEST_HTTP_READ_TIMEOUT"] = "3s"
			env["TEST_ENABLE_LOGGER"] = "false"
			env["TEST_TRUSTED_PROXIES"] = `["127.0.0.1"]`
			got, err = OverlayEnv(base, opts)
			if err != nil || got.Server.Address != "127.0.0.1:9001" || got.Server.HTTP.ReadTimeout != 3*time.Second || got.Server.EnableLogger || len(got.Server.TrustedProxies) != 1 {
				t.Fatal(got, err)
			}
			env["TEST_SERVER_ADDRESS"] = ""
			got, err = OverlayEnv(base, opts)
			if err != nil {
				t.Fatal(err)
			}
			expected := ""
			if policy == "ignore" {
				expected = base.Server.Address
			}
			if got.Server.Address != expected {
				t.Fatal("empty canonical unexpectedly fell through to alias")
			}
		})
	}
	if base.Server.Address != ":8080" || base.Label != "base" {
		t.Fatal("defaults mutated")
	}
}
func TestAliasTypeErrorsDoNotExposeValue(t *testing.T) {
	opts := EnvOptions{Prefix: "X_", Empty: "reject", Aliases: ServerEnvAliases("X_", ""), Lookup: func(k string) (string, bool) { return "private-invalid", k == "X_HTTP_READ_TIMEOUT" }}
	if _, err := OverlayEnv(Default(), opts); err == nil || strings.Contains(err.Error(), "private-invalid") {
		t.Fatal(err)
	}
}