package service

import "testing"

func intPtr(v int) *int { return &v }

func TestValidateDeliveryInput(t *testing.T) {
	dataDisks := []string{"/data", "/disk1"}
	valid := MySQLDeliveryInput{BusinessLineID: 1, TargetID: 1, Namespace: "team-a", InstanceName: "mysql-01", CPUMilli: 500, MemoryMi: 2048, StorageGi: 20}
	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 = "/disk1"
	full.TargetHost = "k8s-server-03"
	full.MemoryMi = 8192
	full.StorageGi = 2000
	full.Timezone = "+08:00"
	full.LowerCaseTableNames = intPtr(0)
	full.CharacterSet = "utf8mb4"
	full.Collation = "utf8mb4_general_ci"
	full.MaxConnections = "auto"
	full.InnodbRedoLogCapacity = "256M"
	full.InnodbFlushLogAtTrxCommit = intPtr(2)
	full.SyncBinlog = intPtr(0)
	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 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 },
		"data disk not in list": func(in *MySQLDeliveryInput) { in.DataDisk = "/mnt/other" },
		"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) { in.LowerCaseTableNames = intPtr(2) },
		"bad charset":           func(in *MySQLDeliveryInput) { in.CharacterSet = "big5" },
		"collation mismatch":    func(in *MySQLDeliveryInput) { in.CharacterSet = "gbk"; in.Collation = "utf8mb4_general_ci" },
		"collation vs default":  func(in *MySQLDeliveryInput) { in.Collation = "gbk_chinese_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) { in.InnodbFlushLogAtTrxCommit = intPtr(3) },
		"bad sync binlog":       func(in *MySQLDeliveryInput) { in.SyncBinlog = intPtr(2) },
		"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)
	}
	// 摊满一轮后回到首台叠加第二个实例
	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)
	}
	// limit < 1 退化为一机一实例
	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")
	}
}