package main

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

func TestReadConfigUsesDefaults(t *testing.T) {
	values := map[string]string{
		"ZARINHUB_API_USERNAME": "test-username",
		"ZARINHUB_API_PASSWORD": "test-password",
	}

	config, err := readConfig(func(key string) string {
		return values[key]
	})
	if err != nil {
		t.Fatalf("readConfig() error = %v", err)
	}

	if config.ServerAddr != "127.0.0.1:8080" {
		t.Errorf("ServerAddr = %q", config.ServerAddr)
	}
	if config.FrontendOrigin != "http://127.0.0.1:3000" {
		t.Errorf("FrontendOrigin = %q", config.FrontendOrigin)
	}
	if config.ZarinHubAuthEndpoint != "https://zarin-hub.com/api/v5/Authentication/GetToken" {
		t.Errorf("ZarinHubAuthEndpoint = %q", config.ZarinHubAuthEndpoint)
	}
	if config.ZarinHubTimeout != 5*time.Second {
		t.Errorf("ZarinHubTimeout = %v", config.ZarinHubTimeout)
	}
	if config.DatabasePath != "./card-to-iban.db" {
		t.Errorf("DatabasePath = %q", config.DatabasePath)
	}
}

func TestReadConfigRejectsMissingUsername(t *testing.T) {
	_, err := readConfig(func(key string) string { return "" })
	if err == nil || !strings.Contains(err.Error(), "ZARINHUB_API_USERNAME") {
		t.Fatalf("readConfig() error = %v, want missing username error", err)
	}
}

func TestReadConfigRejectsMissingPassword(t *testing.T) {
	values := map[string]string{
		"ZARINHUB_API_USERNAME": "test-username",
	}

	_, err := readConfig(func(key string) string {
		return values[key]
	})
	if err == nil || !strings.Contains(err.Error(), "ZARINHUB_API_PASSWORD") {
		t.Fatalf("readConfig() error = %v, want missing password error", err)
	}
}

func TestReadConfigRejectsInvalidTimeout(t *testing.T) {
	values := map[string]string{
		"ZARINHUB_API_USERNAME": "test-username",
		"ZARINHUB_API_PASSWORD": "test-password",
		"ZARINHUB_TIMEOUT":      "later",
	}

	_, err := readConfig(func(key string) string {
		return values[key]
	})
	if err == nil || !strings.Contains(err.Error(), "ZARINHUB_TIMEOUT") {
		t.Fatalf("readConfig() error = %v, want timeout error", err)
	}
}