package service

import (
	"testing"
	"time"

	"github.com/1024XEngineer/xinfra/server/internal/model"
)

func TestValidateDeliveryInput(t *testing.T) {
	dataDisks := []string{"/data", "/disk1"}
	valid := MySQLDeliveryInput{BusinessLineID: 1, TargetID: 1, Namespace: "team-a", InstanceName: "mysql-01", CPUCores: 2, MemoryGB: 4, StorageGB: 50}
	normalizeMySQLDeliveryInput(&valid)
	if err := validateDeliveryInput(valid, dataDisks); err != nil {
		t.Fatalf("valid input rejected: %v", err)
	}
	full := valid
	full.MySQLVersion = "8.0"
	full.Topology = "standalone"
	full.MySQLPort = 13306
	full.DataDisk = "/var/lib/mysql01"
	full.TargetHost = "k8s-server-03"
	full.CPUMilli = 2000
	full.MemoryMi = 8192
	full.StorageGi = 2000
	full.Timezone = "+08:00"
	lowerCaseZero := 0
	full.LowerCaseTableNames = &lowerCaseZero
	full.CharacterSet = "utf8mb4"
	full.Collation = "utf8mb4_general_ci"
	full.MaxConnections = "auto"
	full.InnodbRedoLogCapacity = "256M"
	flushLog := 2
	full.InnodbFlushLogAtTrxCommit = &flushLog
	syncBinlog := 0
	full.SyncBinlog = &syncBinlog
	full.InnodbIOCapacity = 2000
	full.LongQueryTime = 0.5
	full.BinlogExpireLogsSeconds = 604800
	full.MaxBinlogSize = "512M"
	if err := validateDeliveryInput(full, dataDisks); err != nil {
		t.Fatalf("valid full input rejected: %v", err)
	}
	namedZone := valid
	namedZone.Timezone = "Asia/Shanghai"
	if err := validateDeliveryInput(namedZone, dataDisks); err != nil {
		t.Fatalf("named timezone rejected: %v", err)
	}
	lts := valid
	lts.MySQLVersion = "8.4"
	if err := validateDeliveryInput(lts, dataDisks); err != nil {
		t.Fatalf("8.4 LTS rejected: %v", err)
	}
	for name, mutate := range map[string]func(*MySQLDeliveryInput){
		"uppercase namespace":  func(in *MySQLDeliveryInput) { in.Namespace = "Team-A" },
		"bad instance":         func(in *MySQLDeliveryInput) { in.InstanceName = "mysql_01" },
		"too little cpu":       func(in *MySQLDeliveryInput) { in.CPUMilli = 50 },
		"too much cpu":         func(in *MySQLDeliveryInput) { in.CPUMilli = 65000 },
		"too little memory":    func(in *MySQLDeliveryInput) { in.MemoryMi = 1024 },
		"too much memory":      func(in *MySQLDeliveryInput) { in.MemoryMi = 131072 },
		"too little storage":   func(in *MySQLDeliveryInput) { in.StorageGi = 10 },
		"too much storage":     func(in *MySQLDeliveryInput) { in.StorageGi = 4000 },
		"unsupported version":  func(in *MySQLDeliveryInput) { in.MySQLVersion = "5.7" },
		"eol version":          func(in *MySQLDeliveryInput) { in.MySQLVersion = "5.6" },
		"unsupported topology": func(in *MySQLDeliveryInput) { in.Topology = "mgr_3" },
		"port below pool":      func(in *MySQLDeliveryInput) { in.MySQLPort = 3307 },
		"port above pool":      func(in *MySQLDeliveryInput) { in.MySQLPort = 14000 },
		"bad target host":      func(in *MySQLDeliveryInput) { in.TargetHost = "-bad-host" },
		"bad timezone":         func(in *MySQLDeliveryInput) { in.Timezone = "UTC+8" },
		"bad lower case":       func(in *MySQLDeliveryInput) { v := 2; in.LowerCaseTableNames = &v },
		"bad charset":          func(in *MySQLDeliveryInput) { in.CharacterSet = "big5" },
		"collation mismatch":   func(in *MySQLDeliveryInput) { in.CharacterSet = "gbk"; in.Collation = "utf8mb4_general_ci" },
		"bad max connections":  func(in *MySQLDeliveryInput) { in.MaxConnections = "300" },
		"bad redo capacity":    func(in *MySQLDeliveryInput) { in.InnodbRedoLogCapacity = "2G" },
		"bad flush log":        func(in *MySQLDeliveryInput) { v := 3; in.InnodbFlushLogAtTrxCommit = &v },
		"bad sync binlog":      func(in *MySQLDeliveryInput) { v := 2; in.SyncBinlog = &v },
		"bad io capacity":      func(in *MySQLDeliveryInput) { in.InnodbIOCapacity = 500 },
		"bad long query time":  func(in *MySQLDeliveryInput) { in.LongQueryTime = 3 },
		"bad binlog expire":    func(in *MySQLDeliveryInput) { in.BinlogExpireLogsSeconds = 3600 },
		"bad max binlog size":  func(in *MySQLDeliveryInput) { in.MaxBinlogSize = "64M" },
	} {
		input := valid
		mutate(&input)
		if err := validateDeliveryInput(input, dataDisks); err == nil {
			t.Errorf("%s was accepted", name)
		}
	}
}

func TestFirstFreeHost(t *testing.T) {
	hosts := []targetHost{{Name: "node-a"}, {Name: "node-b"}}
	if h := firstFreeHost(hosts, nil, 1); h == nil || h.Name != "node-a" {
		t.Fatalf("expected node-a on empty occupancy, got %+v", h)
	}
	if h := firstFreeHost(hosts, []string{"node-a"}, 1); h == nil || h.Name != "node-b" {
		t.Fatalf("expected node-b when node-a is full at limit 1, got %+v", h)
	}
	if h := firstFreeHost(hosts, []string{"node-a", "node-b"}, 1); h != nil {
		t.Fatalf("limit 1 with all hosts taken should return nil, got %+v", h)
	}
	if h := firstFreeHost(hosts, []string{"node-a", "node-b"}, 2); h == nil || h.Name != "node-a" {
		t.Fatalf("expected node-a for second round at limit 2, got %+v", h)
	}
	if h := firstFreeHost(hosts, []string{"node-a", "node-a", "node-b", "node-b"}, 2); h != nil {
		t.Fatalf("limit 2 with all hosts saturated should return nil, got %+v", h)
	}
	if h := firstFreeHost(hosts, []string{"node-a"}, 0); h == nil || h.Name != "node-b" {
		t.Fatalf("limit 0 should degrade to 1, got %+v", h)
	}
}

func TestAllocatePort(t *testing.T) {
	if port, err := allocatePort(0, nil); err != nil || port != mysqlPortPoolStart {
		t.Fatalf("expected first pool port %d, got %d err=%v", mysqlPortPoolStart, port, err)
	}
	if port, err := allocatePort(0, []int{13306, 13307}); err != nil || port != 13308 {
		t.Fatalf("expected 13308 skipping occupied, got %d err=%v", port, err)
	}
	if port, err := allocatePort(13400, []int{13306}); err != nil || port != 13400 {
		t.Fatalf("expected requested port 13400, got %d err=%v", port, err)
	}
	if _, err := allocatePort(13306, []int{13306}); err == nil {
		t.Fatal("requested occupied port was accepted")
	}
	used := make([]int, 0, mysqlPortPoolEnd-mysqlPortPoolStart+1)
	for p := mysqlPortPoolStart; p <= mysqlPortPoolEnd; p++ {
		used = append(used, p)
	}
	if _, err := allocatePort(0, used); err == nil {
		t.Fatal("exhausted pool still allocated a port")
	}
}

func TestRollbackExtraVarsTargetsOnlyTheAllocatedInstance(t *testing.T) {
	task := &model.DeliveryTask{ID: "task-1", TargetHost: "db-01"}
	payload := deliveryPayload{MySQLDeliveryInput: MySQLDeliveryInput{InstanceName: "mysql-a", DataDisk: "/disk1"}}
	vars := rollbackExtraVars(task, payload)
	if vars["target_hosts"] != "db-01" || vars["instance_name"] != "mysql-a" || vars["data_disk"] != "/disk1" {
		t.Fatalf("rollback vars target the wrong instance: %#v", vars)
	}
	if vars["rollback"] != true {
		t.Fatalf("rollback marker missing: %#v", vars)
	}
}

func TestRegisterFailedIsProtectedFromRollback(t *testing.T) {
	if !rollbackProtectedStatus(model.TaskRegisterFailed) {
		t.Fatal("register_failed must preserve the healthy instance and resource usage")
	}
	if rollbackProtectedStatus(model.TaskValidationFailed) {
		t.Fatal("validation_failed must still be eligible for cleanup rollback")
	}
}

func TestRollbackLaunchExpired(t *testing.T) {
	now := time.Date(2026, 7, 28, 12, 0, 0, 0, time.UTC)
	started := now.Add(-rollbackLaunchTimeout - time.Second)
	if !rollbackLaunchExpired(model.RollbackJob{Status: "launching", StartedAt: &started}, now) {
		t.Fatal("stale launching rollback job must be recoverable")
	}
	if rollbackLaunchExpired(model.RollbackJob{Status: "launching", StartedAt: ptrTime(now.Add(-rollbackLaunchTimeout + time.Second))}, now) {
		t.Fatal("recent launching rollback job must remain pending")
	}
	if rollbackLaunchExpired(model.RollbackJob{Status: "running", StartedAt: &started}, now) {
		t.Fatal("running rollback job is not a launch timeout")
	}
}

func ptrTime(v time.Time) *time.Time { return &v }