package bossraid

import (
	"errors"
	"time"

	"gorm.io/gorm"
)

// ErrStatusConflict indicates that a room's status was already changed by another request.
var ErrStatusConflict = errors.New("방 상태가 이미 변경되었습니다")

type RoomStatus string

const (
	StatusWaiting    RoomStatus = "waiting"
	StatusInProgress RoomStatus = "in_progress"
	StatusCompleted  RoomStatus = "completed"
	StatusFailed       RoomStatus = "failed"
	StatusRewardFailed RoomStatus = "reward_failed"
)

// BossRoom represents a boss raid session room.
type BossRoom struct {
	ID          uint           `json:"id"          gorm:"primaryKey"`
	CreatedAt   time.Time      `json:"createdAt"   gorm:"index"`
	UpdatedAt   time.Time      `json:"updatedAt"`
	DeletedAt   gorm.DeletedAt `json:"-"           gorm:"index"`
	SessionName string         `json:"sessionName" gorm:"type:varchar(100);uniqueIndex;not null"`
	BossID      int            `json:"bossId"      gorm:"index;not null"`
	Status      RoomStatus     `json:"status"      gorm:"type:varchar(20);index;default:waiting;not null"`
	MaxPlayers  int            `json:"maxPlayers"  gorm:"default:3;not null"`
	// Players is stored as a JSON text column for simplicity.
	// TODO: For better query performance, consider migrating to a junction table
	// (boss_room_players with room_id + username columns).
	Players     string         `json:"players"     gorm:"type:text"` // JSON array of usernames
	StartedAt   *time.Time     `json:"startedAt,omitempty"`
	CompletedAt *time.Time     `json:"completedAt,omitempty"`
}

// SlotStatus represents the status of a dedicated server room slot.
type SlotStatus string

const (
	SlotIdle       SlotStatus = "idle"
	SlotWaiting    SlotStatus = "waiting"
	SlotInProgress SlotStatus = "in_progress"
)


// DedicatedServer represents a server group (e.g., "Dedi1").
// Multiple containers (replicas) share the same server group name.
type DedicatedServer struct {
	ID         uint           `json:"id"         gorm:"primaryKey"`
	CreatedAt  time.Time      `json:"createdAt"`
	UpdatedAt  time.Time      `json:"updatedAt"`
	DeletedAt  gorm.DeletedAt `json:"-"          gorm:"index"`
	ServerName string         `json:"serverName" gorm:"type:varchar(100);uniqueIndex;not null"`
	MaxRooms   int            `json:"maxRooms"   gorm:"default:10;not null"`
}

// RoomSlot represents a room slot on a dedicated server.
// Each slot has a stable session name that the Fusion NetworkRunner uses.
// InstanceID tracks which container process currently owns this slot.
type RoomSlot struct {
	ID                uint           `json:"id"                gorm:"primaryKey"`
	CreatedAt         time.Time      `json:"createdAt"`
	UpdatedAt         time.Time      `json:"updatedAt"`
	DeletedAt         gorm.DeletedAt `json:"-"                 gorm:"index"`
	DedicatedServerID uint           `json:"dedicatedServerId" gorm:"index;uniqueIndex:idx_server_slot;not null"`
	SlotIndex         int            `json:"slotIndex"         gorm:"uniqueIndex:idx_server_slot;not null"`
	SessionName       string         `json:"sessionName"       gorm:"type:varchar(100);uniqueIndex;not null"`
	Status            SlotStatus     `json:"status"            gorm:"type:varchar(20);index;default:idle;not null"`
	BossRoomID        *uint          `json:"bossRoomId"        gorm:"index"`
	InstanceID        string         `json:"instanceId"        gorm:"type:varchar(100);index"`
	LastHeartbeat     *time.Time     `json:"lastHeartbeat"`
}

// RewardFailure records a failed reward grant for later retry.
// A record is "pending" when ResolvedAt is nil and RetryCount < maxRetries (10).
type RewardFailure struct {
	ID          uint       `json:"id"          gorm:"primaryKey"`
	CreatedAt   time.Time  `json:"createdAt"   gorm:"index"`
	SessionName string     `json:"sessionName" gorm:"type:varchar(100);index;not null"`
	Username    string     `json:"username"    gorm:"type:varchar(100);index;not null"`
	TokenAmount uint64     `json:"tokenAmount" gorm:"not null"`
	Assets      string     `json:"assets"      gorm:"type:text"`
	Experience  int        `json:"experience"  gorm:"default:0;not null"`
	Error       string     `json:"error"       gorm:"type:text"`
	RetryCount  int        `json:"retryCount"  gorm:"default:0;not null"`
	LastTxID    string     `json:"lastTxId"    gorm:"type:varchar(100)"` // 마지막 시도한 블록체인 트랜잭션 ID (이중 지급 방지용)
	ResolvedAt  *time.Time `json:"resolvedAt"  gorm:"index"`
}