package service

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

	"github.com/mhsanaei/3x-ui/v3/internal/database"
	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
	"github.com/mhsanaei/3x-ui/v3/internal/tuic"
	"github.com/mhsanaei/3x-ui/v3/internal/xray"
)

func TestInjectTuicSocks(t *testing.T) {
	cfg := &xray.Config{}
	inbounds := []*model.Inbound{
		{
			Id:       5,
			Tag:      "tuic-in-5",
			Protocol: model.TUIC,
			Enable:   true,
			Settings: `{
				"certificate": "dummy-cert",
				"private_key": "dummy-key",
				"clients": [
					{"uuid": "a0000000-0000-0000-0000-000000000001", "password": "pass1", "email": "user1@example.com", "enable": true}
				]
			}`,
		},
	}

	injectTuicSocks(cfg, inbounds)

	if len(cfg.InboundConfigs) != 1 {
		t.Fatalf("expected 1 injected SOCKS inbound, got %d", len(cfg.InboundConfigs))
	}

	sc := cfg.InboundConfigs[0]
	if sc.Tag != "tuic-in-5" {
		t.Fatalf("expected tag tuic-in-5, got %s", sc.Tag)
	}
	if sc.Protocol != "socks" {
		t.Fatalf("expected protocol socks, got %s", sc.Protocol)
	}
	expectedPort := tuic.SOCKSPortForInbound(5)
	if sc.Port != expectedPort {
		t.Fatalf("expected port %d, got %d", expectedPort, sc.Port)
	}
	if string(sc.Listen) != `"127.0.0.1"` {
		t.Fatalf("expected listen 127.0.0.1, got %s", sc.Listen)
	}
	if string(sc.Sniffing) != tuicEgressSniffingSettings {
		t.Fatalf("expected sniffing settings %s, got %s", tuicEgressSniffingSettings, sc.Sniffing)
	}

	var parsedSettings struct {
		Auth string `json:"auth"`
		UDP  bool   `json:"udp"`
	}
	if err := json.Unmarshal(sc.Settings, &parsedSettings); err != nil {
		t.Fatalf("failed to unmarshal settings: %v", err)
	}
	if parsedSettings.Auth != "noauth" || !parsedSettings.UDP {
		t.Fatalf("expected auth=noauth, udp=true, got %+v", parsedSettings)
	}
}

func TestCheckTuicSocksConflict(t *testing.T) {
	setupConflictDB(t)

	// Seed TUIC inbound with ID 10
	tuicIb := &model.Inbound{
		Id:       10,
		Tag:      "tuic-10",
		Protocol: model.TUIC,
		Enable:   true,
		Listen:   "0.0.0.0",
		Port:     8443,
		Settings: `{"clients":[{"uuid":"a0000000-0000-0000-0000-000000000001","password":"p","email":"u@test.com"}]}`,
	}
	if err := database.GetDB().Create(tuicIb).Error; err != nil {
		t.Fatalf("failed to seed TUIC inbound: %v", err)
	}

	relayPort := tuic.SOCKSPortForInbound(10)

	// Try to create a new TCP inbound on that relayPort on 127.0.0.1
	newIb := &model.Inbound{
		Tag:      "colliding-inbound",
		Protocol: model.Mixed,
		Enable:   true,
		Listen:   "127.0.0.1",
		Port:     relayPort,
	}

	detail, err := checkTuicSocksConflict(database.GetDB(), newIb, 0, transportTCP)
	if err != nil {
		t.Fatalf("checkTuicSocksConflict error: %v", err)
	}
	if detail == nil {
		t.Fatalf("expected conflict on port %d, got none", relayPort)
	}
	if detail.Tag != "tuic-10" {
		t.Fatalf("expected conflict tag tuic-10, got %s", detail.Tag)
	}
}

func TestCheckTuicSocksReverseConflict(t *testing.T) {
	setupConflictDB(t)

	targetPort := tuic.SOCKSPortForInbound(20)

	// Seed existing inbound on targetPort on 127.0.0.1
	existing := &model.Inbound{
		Id:       99,
		Tag:      "existing-on-relay-port",
		Protocol: model.Mixed,
		Enable:   true,
		Listen:   "127.0.0.1",
		Port:     targetPort,
	}
	if err := database.GetDB().Create(existing).Error; err != nil {
		t.Fatalf("failed to seed existing inbound: %v", err)
	}

	detail, err := checkTuicSocksReverseConflict(database.GetDB(), 20)
	if err != nil {
		t.Fatalf("checkTuicSocksReverseConflict error: %v", err)
	}
	if detail == nil {
		t.Fatalf("expected reverse conflict for id 20 on port %d, got none", targetPort)
	}
	if detail.Tag != "existing-on-relay-port" {
		t.Fatalf("expected tag existing-on-relay-port, got %s", detail.Tag)
	}
}

func TestDesiredTuicInstances(t *testing.T) {
	setupConflictDB(t)

	ib := &model.Inbound{
		Id:       30,
		Tag:      "tuic-desired-test",
		Protocol: model.TUIC,
		Enable:   true,
		Listen:   "0.0.0.0",
		Port:     9443,
		Settings: `{
			"certificate": "cert",
			"private_key": "key",
			"clients": [
				{"uuid": "a0000000-0000-0000-0000-000000000001", "password": "p1", "email": "active@test.com", "enable": true},
				{"uuid": "a0000000-0000-0000-0000-000000000002", "password": "p2", "email": "disabled@test.com", "enable": true}
			]
		}`,
	}
	if err := database.GetDB().Create(ib).Error; err != nil {
		t.Fatalf("failed to seed inbound: %v", err)
	}

	// Add client traffic entry disabling disabled@test.com
	ct := &xray.ClientTraffic{
		InboundId: 30,
		Email:     "disabled@test.com",
		Enable:    false,
	}
	if err := database.GetDB().Create(ct).Error; err != nil {
		t.Fatalf("failed to seed client traffic: %v", err)
	}

	svc := &InboundService{}
	instances, err := svc.DesiredTuicInstances()
	if err != nil {
		t.Fatalf("DesiredTuicInstances failed: %v", err)
	}

	found := false
	for _, inst := range instances {
		if inst.Id == 30 {
			found = true
			if len(inst.Clients) != 1 || inst.Clients[0].Email != "active@test.com" {
				t.Fatalf("expected only active@test.com, got %+v", inst.Clients)
			}
		}
	}
	if !found {
		t.Fatal("expected to find instance for inbound 30")
	}
}

func TestCheckForwardedPortsConflict_CollidesWithTuicSocksPort(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflict(t, "tuic-1", "0.0.0.0", 8443, model.TUIC, ``, `{"clients":[{"uuid":"u","password":"p","email":"e"}]}`)

	var tuicInbound model.Inbound
	if err := database.GetDB().Where("tag = ?", "tuic-1").First(&tuicInbound).Error; err != nil {
		t.Fatalf("read seeded row: %v", err)
	}
	relayPort := tuic.SOCKSPortForInbound(tuicInbound.Id)

	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	hit := svc.checkForwardedPortsConflict(ctx, fmt.Sprintf("%d", relayPort))
	if !strings.Contains(hit, "SOCKS5") {
		t.Fatalf("expected a collision naming the TUIC inbound's SOCKS5 relay port, got %q", hit)
	}
}

func TestCheckTuicSocksConflict_DisabledInboundRetainsReservation(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflict(t, "tuic-disabled", "0.0.0.0", 8443, model.TUIC, ``, `{"clients":[{"uuid":"u","password":"p","email":"e"}]}`)

	var tuicIb model.Inbound
	if err := database.GetDB().Where("tag = ?", "tuic-disabled").First(&tuicIb).Error; err != nil {
		t.Fatalf("read seeded row: %v", err)
	}
	if err := database.GetDB().Model(&tuicIb).Update("enable", false).Error; err != nil {
		t.Fatalf("disable inbound: %v", err)
	}

	relayPort := tuic.SOCKSPortForInbound(tuicIb.Id)

	testIb := &model.Inbound{
		Tag:      "conflict-test",
		Protocol: model.VLESS,
		Listen:   "127.0.0.1",
		Port:     relayPort,
		Enable:   true,
	}

	conflict, err := checkTuicSocksConflict(database.GetDB(), testIb, 0, transportTCP)
	if err != nil {
		t.Fatalf("checkTuicSocksConflict: %v", err)
	}
	if conflict == nil {
		t.Fatal("expected conflict on disabled TUIC inbound's SOCKS port, got nil")
	}
	if conflict.InboundID != tuicIb.Id {
		t.Fatalf("expected conflict with inbound %d, got %d", tuicIb.Id, conflict.InboundID)
	}
}

func TestCheckTuicSocksRelayCollision(t *testing.T) {
	setupConflictDB(t)
	// Seed first TUIC inbound with ID 1
	ib1 := &model.Inbound{
		Id:       1,
		Tag:      "tuic-1",
		Protocol: model.TUIC,
		Enable:   true,
		Listen:   "0.0.0.0",
		Port:     8443,
		Settings: `{"clients":[{"uuid":"a0000000-0000-0000-0000-000000000001","password":"p","email":"u1@test.com"}]}`,
	}
	if err := database.GetDB().Create(ib1).Error; err != nil {
		t.Fatalf("seed ib1: %v", err)
	}

	// ID 1001 wraps to the same relay port (64001) as ID 1
	conflict, err := checkTuicSocksRelayCollision(database.GetDB(), 1001)
	if err != nil {
		t.Fatalf("checkTuicSocksRelayCollision: %v", err)
	}
	if conflict == nil {
		t.Fatal("expected collision between ID 1001 and ID 1, got nil")
	}
	if conflict.InboundID != 1 {
		t.Fatalf("expected collision with inbound 1, got %d", conflict.InboundID)
	}
}

func TestTuicSocksSelfConflict(t *testing.T) {
	ib := &model.Inbound{
		Protocol: model.TUIC,
		Listen:   "127.0.0.1",
		Port:     tuic.SOCKSPortForInbound(5),
	}
	errStr := tuicSocksSelfConflict(ib, 5)
	if errStr == "" {
		t.Fatal("expected self conflict error string, got empty")
	}
	if !strings.Contains(errStr, "own SOCKS5 relay port") {
		t.Fatalf("unexpected error string: %s", errStr)
	}

	// Different port should not conflict
	ib.Port = 9999
	if diff := tuicSocksSelfConflict(ib, 5); diff != "" {
		t.Fatalf("expected no conflict for different port, got %s", diff)
	}
}

func TestInboundTuicServerParsesLegacyFlatSettings(t *testing.T) {
	server := inboundTuicServer(string(model.TUIC), `{"certificate":"/cert.pem","private_key":"/secret-key.pem","congestion_control":" CuBiC ","udp_relay_mode":"quic","sni":"profile.example"}`)
	if server == nil {
		t.Fatal("expected legacy flat TUIC settings")
	}
	if server.CongestionControl != "cubic" || server.UDPRelayMode != "quic" || server.SNI != "profile.example" {
		t.Fatalf("legacy flat fields were not normalized: %+v", server)
	}
	if server.PrivateKey != "" {
		t.Fatal("client preview exposed the inbound private key")
	}
}

func TestNormalizeTuicSettingsCanonicalizesCongestionAndPacketLimit(t *testing.T) {
	ib := &model.Inbound{Protocol: model.TUIC, Settings: `{"congestion_control":"RENO","max_udp_relay_packet_size":65507,"server":{"congestion_control":" CuBiC ","max_udp_relay_packet_size":65500}}`}
	if err := normalizeTuicSettings(ib); err != nil {
		t.Fatalf("normalizeTuicSettings: %v", err)
	}
	var got struct {
		CongestionControl string `json:"congestion_control"`
		MaxPacketSize     int    `json:"max_udp_relay_packet_size"`
		Server            struct {
			CongestionControl string `json:"congestion_control"`
			MaxPacketSize     int    `json:"max_udp_relay_packet_size"`
		} `json:"server"`
	}
	if err := json.Unmarshal([]byte(ib.Settings), &got); err != nil {
		t.Fatalf("unmarshal normalized settings: %v", err)
	}
	if got.CongestionControl != "new_reno" || got.Server.CongestionControl != "cubic" {
		t.Fatalf("congestion controllers were not canonicalized: %+v", got)
	}
	if got.MaxPacketSize != 65245 || got.Server.MaxPacketSize != 65245 {
		t.Fatalf("packet limits were not clamped: %+v", got)
	}

	ib.Settings = `{"server":{"congestion_control":"experimental"}}`
	if err := normalizeTuicSettings(ib); err == nil {
		t.Fatal("unsupported congestion controller was accepted")
	}
}