package systemconfig

import (
	"encoding/json"
	"strings"
	"testing"
)

func TestDecodeCP1252Mojibake(t *testing.T) {
	original := `{"label":"6级子弹","price":"0.26元/发","punct":"（：，）"}`
	mojibake := encodeCP1252Mojibake(original)

	decoded, ok := decodeCP1252Mojibake(mojibake)
	if !ok {
		t.Fatal("期望识别出 CP1252 乱码")
	}
	if decoded != original {
		t.Fatalf("还原结果 = %q, want %q", decoded, original)
	}
	if _, ok := decodeCP1252Mojibake(original); ok {
		t.Fatal("正常中文不应被误判为乱码")
	}
	if _, ok := decodeCP1252Mojibake("plain ascii"); ok {
		t.Fatal("纯 ASCII 不应被误判为乱码")
	}
}

func TestRepairMojibakeJSONRepairsIndividualFields(t *testing.T) {
	raw := `{"normal":"正常字段","broken":"` + encodeCP1252Mojibake("6级子弹") + `"}`
	repaired := repairMojibakeJSON(raw)

	var payload map[string]string
	if err := json.Unmarshal([]byte(repaired), &payload); err != nil {
		t.Fatalf("还原后的 JSON 无法解析: %v", err)
	}
	if payload["normal"] != "正常字段" {
		t.Fatalf("正常字段被破坏: %q", payload["normal"])
	}
	if payload["broken"] != "6级子弹" {
		t.Fatalf("乱码字段未还原: %q", payload["broken"])
	}
}

func TestNormalizePublishOptionsValueMigratesLegacyQuantityItems(t *testing.T) {
	legacy := `{
		"server_options": ["QQ"],
		"quantity_items": [
			{"key": "kit5", "label": "5级全装套数量", "price": "5元/个"},
			{"key": "level6Ammo", "label": "6级子弹", "price": "0.26元/发"}
		]
	}`

	normalized, err := normalizePublishOptionsValue(legacy)
	if err != nil {
		t.Fatalf("规范化失败: %v", err)
	}
	var options PublishOptionsDTO
	if err := json.Unmarshal([]byte(normalized), &options); err != nil {
		t.Fatalf("解析规范化结果失败: %v", err)
	}
	if options.SchemaVersion != publishOptionsSchemaVersion {
		t.Fatalf("schema_version = %d, want %d", options.SchemaVersion, publishOptionsSchemaVersion)
	}
	for _, item := range options.QuantityItems {
		if item.Key == "kit5" {
			t.Fatal("旧版 kit5 选项应被迁移掉")
		}
	}
	if !hasQuantityItemKey(options.QuantityItems, "level6Ammo") {
		t.Fatal("迁移后的默认选项缺少 level6Ammo")
	}
}

func TestNormalizePublishOptionsValuePreservesCurrentSchema(t *testing.T) {
	options := DefaultPublishOptions()
	for index := range options.ScreenshotSlots {
		if options.ScreenshotSlots[index].Key == "tencentSecurity" {
			options.ScreenshotSlots[index].Required = true
		}
	}
	options.QuantityItems = append(options.QuantityItems, PublishQuantityItem{
		Key:   "kit5",
		Label: "自定义旧选项",
		Price: "9元/个",
	})
	raw, err := json.Marshal(options)
	if err != nil {
		t.Fatalf("构造当前版本配置失败: %v", err)
	}

	normalized, err := normalizePublishOptionsValue(string(raw))
	if err != nil {
		t.Fatalf("规范化失败: %v", err)
	}
	var got PublishOptionsDTO
	if err := json.Unmarshal([]byte(normalized), &got); err != nil {
		t.Fatalf("解析规范化结果失败: %v", err)
	}
	if !hasQuantityItemKey(got.QuantityItems, "kit5") {
		t.Fatal("当前版本配置中的自定义项不应被旧版迁移清掉")
	}
	for _, slot := range got.ScreenshotSlots {
		if slot.Key == "tencentSecurity" && !slot.Required {
			t.Fatal("当前版本配置中 tencentSecurity.required=true 不应被覆盖")
		}
	}
}

func TestNormalizePublishOptionsValueMigratesSchemaV1Switches(t *testing.T) {
	legacy := `{"schema_version":1,"next_season_pass_enabled":false,"server_options":["QQ"]}`

	normalized, err := normalizePublishOptionsValue(legacy)
	if err != nil {
		t.Fatalf("规范化失败: %v", err)
	}
	var got PublishOptionsDTO
	if err := json.Unmarshal([]byte(normalized), &got); err != nil {
		t.Fatalf("解析规范化结果失败: %v", err)
	}
	if got.SchemaVersion != publishOptionsSchemaVersion {
		t.Fatalf("schema_version = %d, want %d", got.SchemaVersion, publishOptionsSchemaVersion)
	}
	if got.UnlockDemulanEnabled {
		t.Fatal("v1 升级后「是否解锁德穆兰」应默认关闭")
	}
	if !got.NextSeasonPassEnabled {
		t.Fatal("v1 升级后「下赛季是否购买通行证」应默认打开")
	}
}

func TestNormalizePublishOptionsValueKeepsSchemaV2Switches(t *testing.T) {
	options := DefaultPublishOptions()
	options.UnlockDemulanEnabled = true
	options.NextSeasonPassEnabled = false
	raw, err := json.Marshal(options)
	if err != nil {
		t.Fatalf("构造配置失败: %v", err)
	}

	normalized, err := normalizePublishOptionsValue(string(raw))
	if err != nil {
		t.Fatalf("规范化失败: %v", err)
	}
	var got PublishOptionsDTO
	if err := json.Unmarshal([]byte(normalized), &got); err != nil {
		t.Fatalf("解析规范化结果失败: %v", err)
	}
	if !got.UnlockDemulanEnabled {
		t.Fatal("v2 配置中后台手动开启的德穆兰开关不应被覆盖")
	}
	if got.NextSeasonPassEnabled {
		t.Fatal("v2 配置中后台手动关闭的通行证开关不应被覆盖")
	}
}

func TestNormalizePublishOptionsValueRepairsMojibake(t *testing.T) {
	options := DefaultPublishOptions()
	raw, err := json.Marshal(options)
	if err != nil {
		t.Fatalf("构造配置失败: %v", err)
	}
	mojibake := encodeCP1252Mojibake(string(raw))

	normalized, err := normalizePublishOptionsValue(mojibake)
	if err != nil {
		t.Fatalf("规范化乱码配置失败: %v", err)
	}
	var got PublishOptionsDTO
	if err := json.Unmarshal([]byte(normalized), &got); err != nil {
		t.Fatalf("解析规范化结果失败: %v", err)
	}
	if !containsString(got.ServerOptions, "微信") {
		t.Fatalf("乱码未恢复，server_options = %#v", got.ServerOptions)
	}
	if got.SchemaVersion != publishOptionsSchemaVersion {
		t.Fatalf("schema_version = %d, want %d", got.SchemaVersion, publishOptionsSchemaVersion)
	}
}

func encodeCP1252Mojibake(value string) string {
	var builder strings.Builder
	for _, item := range []byte(value) {
		if item >= 0x80 && item <= 0x9F {
			builder.WriteRune(cp1252HighRunes[item-0x80])
			continue
		}
		builder.WriteRune(rune(item))
	}
	return builder.String()
}

func hasQuantityItemKey(items []PublishQuantityItem, key string) bool {
	for _, item := range items {
		if item.Key == key {
			return true
		}
	}
	return false
}

func containsString(items []string, target string) bool {
	for _, item := range items {
		if item == target {
			return true
		}
	}
	return false
}