package service

import (
	"testing"

	"affiliate_dash/internal/model"
)

func TestParseProductRoutingConfig(t *testing.T) {
	// Case 1: 存量老商品未配置，根据 SKU 默认走 DLC
	cfg1 := ParseProductRoutingConfig("", "suit_pink_sheep")
	if cfg1.RoutingMode != RoutingModeDLC {
		t.Fatalf("expected RoutingModeDLC, got %s", cfg1.RoutingMode)
	}
	if cfg1.DLCGoodID != "682ef3c5a8f40c4234c59f4d" {
		t.Fatalf("expected builtin goodID 682ef3c5a8f40c4234c59f4d, got %s", cfg1.DLCGoodID)
	}

	// Case 2: 仅配置乐玩
	cfg2JSON := `{"routing_mode":"lewan","lewan_product_id":"uuid-001","delivery_type":"LINK_BINDING"}`
	cfg2 := ParseProductRoutingConfig(cfg2JSON, "any_sku")
	if cfg2.RoutingMode != RoutingModeLewan {
		t.Fatalf("expected RoutingModeLewan, got %s", cfg2.RoutingMode)
	}
	if cfg2.LewanProductID != "uuid-001" {
		t.Fatalf("expected lewan_product_id uuid-001, got %s", cfg2.LewanProductID)
	}

	// Case 3: 双平台优先级 (乐玩优先)
	cfg3JSON := `{"routing_mode":"priority","priority":["lewan","dlc"],"dlc_good_id":"dlc-123","lewan_product_id":"uuid-123"}`
	cfg3 := ParseProductRoutingConfig(cfg3JSON, "any_sku")
	if cfg3.RoutingMode != RoutingModePriority {
		t.Fatalf("expected RoutingModePriority, got %s", cfg3.RoutingMode)
	}
	if len(cfg3.Priority) != 2 || cfg3.Priority[0] != ProviderLewan || cfg3.Priority[1] != ProviderDLC {
		t.Fatalf("expected priority [lewan, dlc], got %+v", cfg3.Priority)
	}
	if cfg3.DLCGoodID != "dlc-123" || cfg3.LewanProductID != "uuid-123" {
		t.Fatalf("mismatched IDs: dlc=%s lewan=%s", cfg3.DLCGoodID, cfg3.LewanProductID)
	}

	// Case 4: 兼容历史 legacy 单 provider 字段（无内置 DLC 时仍为 lewan-only）
	cfg4JSON := `{"provider":"lewan","lewan_product_id":"uuid-999"}`
	cfg4 := ParseProductRoutingConfig(cfg4JSON, "any_sku")
	if cfg4.RoutingMode != RoutingModeLewan || cfg4.LewanProductID != "uuid-999" {
		t.Fatalf("legacy lewan format failed: %+v", cfg4)
	}

	// Case 5: legacy 仅有 lewan_product_id，但 SKU 有内置 DLC → 应升为 priority
	cfg5JSON := `{"lewan_product_id":"b1fff090-e389-4c6c-9c51-32751582239d"}`
	cfg5 := ParseProductRoutingConfig(cfg5JSON, "suit_romantic_destiny")
	if cfg5.RoutingMode != RoutingModePriority {
		t.Fatalf("expected priority for dual-capable legacy config, got %s", cfg5.RoutingMode)
	}
	if cfg5.DLCGoodID != "6a13ab21e3bce430aca29b04" {
		t.Fatalf("expected builtin DLC good id, got %s", cfg5.DLCGoodID)
	}

	cfgRock := ParseProductRoutingConfig(`{"routing_mode":"rock","priority":["rock"],"delivery_type":"LINK_BINDING"}`, "rock_black_tshirt")
	if cfgRock.RoutingMode != RoutingModeRock || len(cfgRock.Priority) != 1 || cfgRock.Priority[0] != ProviderRock {
		t.Fatalf("expected rock-only routing, got %+v", cfgRock)
	}
}

func TestFulfillmentRouterResolution(t *testing.T) {
	dlc := NewDLCProvider("https://bff.example", "dlc", nil)
	lewan := NewLewanProvider(nil)
	router := NewFulfillmentRouter(dlc, lewan)

	// Case 1: 存量 DLC 商品
	orderDLC := &model.FulfillmentOrder{
		ProductSKU: "suit_alan_walker",
	}
	providers, _ := router.ResolveProviders(orderDLC)
	if len(providers) != 1 || providers[0].Name() != ProviderDLC {
		t.Fatalf("expected DLC provider for suit_alan_walker, got %d providers", len(providers))
	}

	// Case 2: 仅乐玩商品
	orderLewan := &model.FulfillmentOrder{
		ProductSKU: "custom_lewan_item",
		MerchantProduct: &model.MerchantProduct{
			FulfillmentConfig: `{"routing_mode":"lewan","lewan_product_id":"uuid-001"}`,
		},
	}
	providers, _ = router.ResolveProviders(orderLewan)
	if len(providers) != 1 || providers[0].Name() != ProviderLewan {
		t.Fatalf("expected Lewan provider, got %d providers", len(providers))
	}

	// Case 2b: 显式 lewan 但 SKU 有内置 DLC → 应附带 DLC 回退
	orderLewanWithDLC := &model.FulfillmentOrder{
		ProductSKU: "suit_romantic_destiny",
		MerchantProduct: &model.MerchantProduct{
			FulfillmentConfig: `{"routing_mode":"lewan","lewan_product_id":"b1fff090-e389-4c6c-9c51-32751582239d","dlc_good_id":""}`,
		},
	}
	providers, _ = router.ResolveProviders(orderLewanWithDLC)
	if len(providers) != 2 || providers[0].Name() != ProviderLewan || providers[1].Name() != ProviderDLC {
		t.Fatalf("expected [lewan, dlc] fallback, got %v", providerNames(providers))
	}

	// Case 3: 优先级路由 [lewan, dlc]
	orderPriority := &model.FulfillmentOrder{
		ProductSKU: "shared_item",
		MerchantProduct: &model.MerchantProduct{
			FulfillmentConfig: `{"routing_mode":"priority","priority":["lewan","dlc"],"lewan_product_id":"uuid-001","dlc_good_id":"dlc-001"}`,
		},
	}
	providers, _ = router.ResolveProviders(orderPriority)
	if len(providers) != 2 || providers[0].Name() != ProviderLewan || providers[1].Name() != ProviderDLC {
		t.Fatalf("expected [lewan, dlc], got %v", providers)
	}

	// Case 4: 订单已锁定渠道（已在 result_data 中写明 provider=dlc）
	orderLocked := &model.FulfillmentOrder{
		ProductSKU: "shared_item",
		MerchantProduct: &model.MerchantProduct{
			FulfillmentConfig: `{"routing_mode":"priority","priority":["lewan","dlc"],"lewan_product_id":"uuid-001","dlc_good_id":"dlc-001"}`,
		},
		ResultData: `{"provider":"dlc"}`,
	}
	providers, _ = router.ResolveProviders(orderLocked)
	if len(providers) != 1 || providers[0].Name() != ProviderDLC {
		t.Fatalf("expected locked DLC provider, got %+v", providers)
	}

	// Case 5: 优先级 [dlc, lewan]
	orderDLCFirst := &model.FulfillmentOrder{
		ProductSKU: "shared_item",
		MerchantProduct: &model.MerchantProduct{
			FulfillmentConfig: `{"routing_mode":"priority","priority":["dlc","lewan"],"lewan_product_id":"uuid-001","dlc_good_id":"dlc-001"}`,
		},
	}
	providers, _ = router.ResolveProviders(orderDLCFirst)
	if len(providers) != 2 || providers[0].Name() != ProviderDLC || providers[1].Name() != ProviderLewan {
		t.Fatalf("expected [dlc, lewan], got %v", providerNames(providers))
	}
}

func providerNames(providers []FulfillmentProvider) []string {
	names := make([]string, 0, len(providers))
	for _, p := range providers {
		names = append(names, p.Name())
	}
	return names
}