package service

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

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

func TestParseAndValidateForwardingSpec(t *testing.T) {
	cases := []struct {
		name    string
		raw     string
		selfID  int
		wantErr string
	}{
		{"empty is direct", "", 0, ""},
		{"direct mode", `{"mode":"direct"}`, 0, ""},
		{"manual ok", `{"mode":"forward","landing":"manual","address":"10.0.0.2","port":1080,"protocol":"socks5","username":"u","password":"p"}`, 0, ""},
		{"manual http ok", `{"mode":"forward","landing":"manual","address":"10.0.0.2","port":8080,"protocol":"http"}`, 0, ""},
		{"manual no address", `{"mode":"forward","landing":"manual","port":1080,"protocol":"socks5"}`, 0, "address is required"},
		{"manual bad port", `{"mode":"forward","landing":"manual","address":"10.0.0.2","port":70000,"protocol":"socks5"}`, 0, "out of range"},
		{"manual bad protocol", `{"mode":"forward","landing":"manual","address":"10.0.0.2","port":1080,"protocol":"vless"}`, 0, "unsupported"},
		{"managed ok", `{"mode":"forward","landing":"managed","targetInboundId":7}`, 0, ""},
		{"managed no target", `{"mode":"forward","landing":"managed"}`, 0, "requires choosing"},
		{"managed self", `{"mode":"forward","landing":"managed","targetInboundId":7}`, 7, "itself"},
		{"unknown landing", `{"mode":"forward","landing":"carrier-pigeon"}`, 0, "unknown landing"},
		{"broken json", `{"mode":`, 0, "invalid forwarding"},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			spec, err := ParseForwardingSpec(c.raw)
			if c.wantErr == "invalid forwarding" {
				if err == nil || !strings.Contains(err.Error(), c.wantErr) {
					t.Fatalf("Parse error = %v, want containing %q", err, c.wantErr)
				}
				return
			}
			if err != nil {
				t.Fatalf("Parse: %v", err)
			}
			err = validateForwardingSpec(spec, c.selfID)
			if c.wantErr == "" && err != nil {
				t.Fatalf("validate: %v", err)
			}
			if c.wantErr != "" && (err == nil || !strings.Contains(err.Error(), c.wantErr)) {
				t.Fatalf("validate error = %v, want containing %q", err, c.wantErr)
			}
		})
	}
}

func TestValidateForwardingManagedTarget(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflictNode(t, "landing-mixed", "10.240.64.2", 47814, model.Mixed, "",
		`{"auth":"password","accounts":[{"user":"ngs_x","pass":"secret"}],"udp":true,"ip":"127.0.0.1"}`, nil)
	seedInboundConflictNode(t, "plain-vless", "", 443, model.VLESS, "", moveTestSettings, nil)

	var landing, plain model.Inbound
	database.GetDB().Where("tag = ?", "landing-mixed").First(&landing)
	database.GetDB().Where("tag = ?", "plain-vless").First(&plain)

	svc := &InboundService{}
	entry := &model.Inbound{Forwarding: `{"mode":"forward","landing":"managed","targetInboundId":` +
		strconv.Itoa(landing.Id) + `}`}
	if err := svc.validateForwarding(entry); err != nil {
		t.Fatalf("managed → mixed should pass: %v", err)
	}
	entry.Forwarding = `{"mode":"forward","landing":"managed","targetInboundId":` + strconv.Itoa(plain.Id) + `}`
	if err := svc.validateForwarding(entry); err == nil {
		t.Fatal("managed → vless should fail")
	}
	entry.Forwarding = `{"mode":"forward","landing":"managed","targetInboundId":99999}`
	if err := svc.validateForwarding(entry); err == nil {
		t.Fatal("managed → missing target should fail")
	}
}


type fwdOutbound struct {
	Tag      string `json:"tag"`
	Protocol string `json:"protocol"`
	Settings struct {
		Servers []struct {
			Address string `json:"address"`
			Port    int    `json:"port"`
			Users   []struct {
				User string `json:"user"`
				Pass string `json:"pass"`
			} `json:"users"`
		} `json:"servers"`
	} `json:"settings"`
}

func agentConfigParts(t *testing.T, nodeID int) ([]fwdOutbound, []map[string]any) {
	t.Helper()
	cfg, err := (&XrayService{}).GetXrayConfigForAgent(nodeID, "", "")
	if err != nil {
		t.Fatalf("GetXrayConfigForAgent: %v", err)
	}
	var outbounds []fwdOutbound
	if err := json.Unmarshal(cfg.OutboundConfigs, &outbounds); err != nil {
		t.Fatalf("unmarshal outbounds: %v", err)
	}
	var routing struct {
		Rules []map[string]any `json:"rules"`
	}
	if err := json.Unmarshal(cfg.RouterConfig, &routing); err != nil {
		t.Fatalf("unmarshal routing: %v", err)
	}
	return outbounds, routing.Rules
}

func findOutbound(outbounds []fwdOutbound, tag string) *fwdOutbound {
	for i := range outbounds {
		if outbounds[i].Tag == tag {
			return &outbounds[i]
		}
	}
	return nil
}

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

	agentNode := &model.Node{Name: "fwd-agent", Enable: true, Status: "online", InboundsAdoptedAt: 1}
	if err := database.GetDB().Create(agentNode).Error; err != nil {
		t.Fatalf("create agent node: %v", err)
	}
	landingNode := &model.Node{Name: "fwd-landing", Address: "198.51.100.23", Enable: true, Status: "online", InboundsAdoptedAt: 1}
	if err := database.GetDB().Create(landingNode).Error; err != nil {
		t.Fatalf("create landing node: %v", err)
	}

	// Managed landing: mixed inbound pinned to its internal listen IP.
	seedInboundConflictNode(t, "landing-mixed", "10.240.64.2", 47814, model.Mixed, "",
		`{"auth":"password","accounts":[{"user":"ngs_x","pass":"secret"}],"udp":true,"ip":"127.0.0.1"}`, &landingNode.Id)
	var landing model.Inbound
	database.GetDB().Where("tag = ?", "landing-mixed").First(&landing)

	// Entry A: manual forwarding.
	seedInboundConflictNode(t, "entry-manual", "", 2445, model.VLESS, `{"network":"tcp"}`, moveTestSettings, &agentNode.Id)
	// Entry B: managed forwarding to the landing above.
	seedInboundConflictNode(t, "entry-managed", "", 2446, model.VLESS, `{"network":"tcp"}`, moveTestSettings, &agentNode.Id)
	// Entry C: no forwarding.
	seedInboundConflictNode(t, "entry-direct", "", 2447, model.VLESS, `{"network":"tcp"}`, moveTestSettings, &agentNode.Id)

	var entryA, entryB model.Inbound
	database.GetDB().Where("tag = ?", "entry-manual").First(&entryA)
	database.GetDB().Where("tag = ?", "entry-managed").First(&entryB)
	db := database.GetDB()
	db.Model(&model.Inbound{}).Where("id = ?", entryA.Id).Update("forwarding",
		`{"mode":"forward","landing":"manual","address":"192.0.2.10","port":1080,"protocol":"socks5","username":"u1","password":"p1"}`)
	db.Model(&model.Inbound{}).Where("id = ?", entryB.Id).Update("forwarding",
		`{"mode":"forward","landing":"managed","targetInboundId":`+strconv.Itoa(landing.Id)+`}`)

	outbounds, rules := agentConfigParts(t, agentNode.Id)

	tagA := "fwd-" + strconv.Itoa(entryA.Id)
	obA := findOutbound(outbounds, tagA)
	if obA == nil {
		t.Fatalf("manual forwarding outbound %s missing; have %v", tagA, outbounds)
	}
	if obA.Protocol != "socks" || len(obA.Settings.Servers) != 1 {
		t.Fatalf("manual outbound shape: %+v", obA)
	}
	srv := obA.Settings.Servers[0]
	if srv.Address != "192.0.2.10" || srv.Port != 1080 || len(srv.Users) != 1 ||
		srv.Users[0].User != "u1" || srv.Users[0].Pass != "p1" {
		t.Fatalf("manual server = %+v", srv)
	}

	tagB := "fwd-" + strconv.Itoa(entryB.Id)
	obB := findOutbound(outbounds, tagB)
	if obB == nil {
		t.Fatalf("managed forwarding outbound %s missing", tagB)
	}
	srvB := obB.Settings.Servers[0]
	if srvB.Address != "10.240.64.2" || srvB.Port != 47814 || len(srvB.Users) != 1 ||
		srvB.Users[0].User != "ngs_x" || srvB.Users[0].Pass != "secret" {
		t.Fatalf("managed server = %+v (want listen IP + target account)", srvB)
	}

	// Routing rules for both entries point at their compiled outbounds.
	ruleTargets := map[string]string{}
	for _, r := range rules {
		tags, _ := r["inboundTag"].([]any)
		if len(tags) == 1 {
			if s, ok := tags[0].(string); ok {
				ruleTargets[s], _ = r["outboundTag"].(string)
			}
		}
	}
	if ruleTargets["entry-manual"] != tagA || ruleTargets["entry-managed"] != tagB {
		t.Fatalf("rule targets = %v", ruleTargets)
	}

	// Template base must still be there (default freedom outbound) and the
	// direct entry must not have produced a forwarding outbound.
	if findOutbound(outbounds, "direct") == nil {
		t.Fatal("template default outbound 'direct' lost")
	}
	for _, ob := range outbounds {
		if strings.HasPrefix(ob.Tag, "fwd-") && ob.Tag != tagA && ob.Tag != tagB {
			t.Fatalf("unexpected forwarding outbound %s", ob.Tag)
		}
	}

	// Dynamic compile: edit the template and the spec, rebuild, both apply —
	// proves nothing was snapshotted into a stored egress.
	settingSvc := &SettingService{}
	tmpl, err := settingSvc.GetXrayConfigTemplate()
	if err != nil {
		t.Fatalf("read template: %v", err)
	}
	var tmplObj map[string]any
	if err := json.Unmarshal([]byte(tmpl), &tmplObj); err != nil {
		t.Fatalf("template json: %v", err)
	}
	tmplObj["outbounds"] = append(tmplObj["outbounds"].([]any),
		map[string]any{"tag": "marker-tmpl", "protocol": "freedom"})
	rawTmpl, _ := json.Marshal(tmplObj)
	if err := settingSvc.setString("xrayTemplateConfig", string(rawTmpl)); err != nil {
		t.Fatalf("write template: %v", err)
	}
	db.Model(&model.Inbound{}).Where("id = ?", entryA.Id).Update("forwarding",
		`{"mode":"forward","landing":"manual","address":"192.0.2.10","port":2080,"protocol":"socks5","username":"u1","password":"p1"}`)

	outbounds2, _ := agentConfigParts(t, agentNode.Id)
	if findOutbound(outbounds2, "marker-tmpl") == nil {
		t.Fatal("template edit not reflected in agent config (egress snapshot?)")
	}
	obA2 := findOutbound(outbounds2, tagA)
	if obA2 == nil || obA2.Settings.Servers[0].Port != 2080 {
		t.Fatalf("spec edit not reflected: %+v", obA2)
	}
}