package db

import "time"

// Validator and IP lifecycle states. Kept as typed string constants rather
// than a Go enum type so they round-trip through SQLite TEXT columns and
// JSON without conversion.
const (
	ValidatorUnregistered = "unregistered"
	ValidatorIdle         = "idle"
	ValidatorAssigned     = "assigned"
	ValidatorChecking     = "checking"
	ValidatorUnreachable  = "unreachable"

	// Site (prober) availability states — no assigned/checking equivalent,
	// since a prober isn't bound to one IP at a time.
	SiteUnregistered = "unregistered"
	SiteIdle         = "idle"
	SiteUnreachable  = "unreachable"

	IPQueued            = "queued"
	IPAssigningFIP      = "assigning_fip"
	IPAwaitingSelfCheck = "awaiting_self_check"
	IPChecking          = "checking"
	IPAggregating       = "aggregating"
	IPDone              = "done"
	IPFailed            = "failed"
	// IPOccupied is a terminal state distinct from IPFailed: the floating IP
	// was found already associated to a different port at claim time, so the
	// check cycle never started for this attempt. See
	// Orchestrator.associateFIP and db.MarkFIPOccupied.
	IPOccupied = "occupied"

	ResultPass      = "pass"
	ResultPartial   = "partial"
	ResultFail      = "fail"
	ResultCancelled = "cancelled"

	SourceEgress = "egress"
)

// InboundSource returns the checks.source value for the given prober site
// index (1-based), e.g. InboundSource(1) == "inbound-site-1".
func InboundSource(siteIndex int) string {
	return "inbound-site-" + itoa(siteIndex)
}

func itoa(n int) string {
	if n == 0 {
		return "0"
	}
	neg := n < 0
	if neg {
		n = -n
	}
	var buf [20]byte
	i := len(buf)
	for n > 0 {
		i--
		buf[i] = byte('0' + n%10)
		n /= 10
	}
	if neg {
		i--
		buf[i] = '-'
	}
	return string(buf[i:])
}

type Validator struct {
	ValidatorID     string
	Hostname        string
	OSPortID        string
	State           string
	CurrentIPID     *int64
	AgentVersion    string
	LastHeartbeatAt *time.Time
	CreatedAt       time.Time
	UpdatedAt       time.Time
}

type IPQueueItem struct {
	ID               int64
	IPAddress        string
	Sequence         int
	State            string
	OwnerValidatorID *string
	FIPID            string
	AttemptNumber    int
	RetryCount       int
	LeaseExpiresAt   *time.Time
	EgressComplete   bool
	OverallResult    string
	AssignedAt       *time.Time
	FIPAssociatedAt  *time.Time
	AggregatedAt     *time.Time
	FIPReleasedAt    *time.Time
	RegistryID       int64
	CycleID          int
	CreatedAt        time.Time
	UpdatedAt        time.Time
}

type Check struct {
	ID         int64
	RegistryID int64
	CycleID    int
	// IPID is the ip_queue row this check was originally recorded against.
	// It's cleared to 0 (SQL NULL) if that row was later deleted — history
	// stays reachable via RegistryID/CycleID regardless (see
	// migrations/0007_ip_registry.sql). 0 is never a valid ip_queue id
	// (AUTOINCREMENT starts at 1), so it unambiguously means "orphaned."
	IPID          int64
	IPAddress     string
	AttemptNumber int
	ValidatorID   string
	Source        string
	CheckType     string
	Target        string
	Success       bool
	LatencyMS     int64
	Detail        string
	CheckedAt     time.Time
	CreatedAt     time.Time
}

// RegistryItem is a durable per-address record that survives an address
// being removed from ip_queue and later re-added — see
// migrations/0007_ip_registry.sql. NextCycle is the cycle_id that will be
// assigned the next time this address is (re)submitted; it only ever
// increases, so cycle_id stays unique for this address even across
// ip_queue row deletion/recreation.
type RegistryItem struct {
	ID          int64
	IPAddress   string
	FirstSeenAt time.Time
	LastSeenAt  time.Time
	NextCycle   int
	CreatedAt   time.Time
	UpdatedAt   time.Time
}

type Event struct {
	ID         int64
	SourceType string
	SourceID   string
	IPID       *int64
	// RegistryID/CycleID are resolved from IPID at insert time (see
	// InsertEvent) and stay set even after the ip_queue row IPID pointed to
	// is later deleted, so retention pruning can cut events at the same
	// cycle boundary as checks — see migrations/0007_ip_registry.sql.
	RegistryID int64
	CycleID    int
	EventType  string
	Payload    string
	OccurredAt time.Time
	CreatedAt  time.Time
}

type Site struct {
	Index           int
	SiteID          string
	Hostname        string
	State           string
	LastHeartbeatAt *time.Time
	CreatedAt       time.Time
	UpdatedAt       time.Time
}

type TargetGroup struct {
	Name      string
	Targets   []string
	CreatedAt time.Time
	UpdatedAt time.Time
}

type CheckType struct {
	Name         string
	Enabled      bool
	TargetGroups []string
	CreatedAt    time.Time
	UpdatedAt    time.Time
}

// ResolvedCheckType is a check type with its target groups already expanded
// into a flat target list — what AssignmentForValidator hands to an agent.
type ResolvedCheckType struct {
	Type    string
	Targets []string
}

// SubmitIPsResult categorizes how each address in a SubmitIPs call was
// handled.
type SubmitIPsResult struct {
	Added             []string
	Requeued          []string
	Reordered         []string
	SkippedInProgress []string
}

// DeleteIPsResult categorizes how each address in a DeleteIPs call (or a
// ClearQueue call, which is DeleteIPs given every currently queued address)
// was handled.
type DeleteIPsResult struct {
	Deleted  []string
	NotFound []string
}

// Settings is the singleton row of orchestrator-wide scalar knobs that are
// admin-configurable at runtime (see queries_settings.go).
type Settings struct {
	FIPSettleSeconds int
	// HistoryRetentionCycles caps how many recent check cycles are kept per
	// registry address (see PruneRegistryHistory); 0 means unlimited.
	HistoryRetentionCycles int
	CreatedAt              time.Time
	UpdatedAt              time.Time
}

// InboundChecksSettings is the singleton row describing what the prober
// checks on every site for every in-flight IP (TCP ports + optional ICMP).
// Admin-configurable at runtime (see queries_inbound.go).
type InboundChecksSettings struct {
	Ports     []int
	ICMP      bool
	CreatedAt time.Time
	UpdatedAt time.Time
}

// Auto-cycle phases and outcomes (see AutoCycle).
const (
	AutoCyclePhaseIdle    = "idle"
	AutoCyclePhaseRunning = "running"
	AutoCyclePhaseWaiting = "waiting"

	AutoCycleOutcomeCompleted = "completed"
	AutoCycleOutcomeNoFreeIPs = "no_free_ips"
	AutoCycleOutcomeTimeout   = "timeout"
	AutoCycleOutcomeError     = "error"
	AutoCycleOutcomeStopped   = "stopped"
)

// AutoCycle is the singleton row describing the automatic check cycle:
// its configuration (Enabled, IntervalSeconds, MaxRunSeconds) and its
// persisted runtime state (Phase and timestamps). MaxRunSeconds == 0 means
// no limit on how long a run may wait for checks to finish.
type AutoCycle struct {
	Enabled           bool
	IntervalSeconds   int
	MaxRunSeconds     int
	Phase             string
	RunStartedAt      *time.Time
	NextRunAt         *time.Time
	LastRunStartedAt  *time.Time
	LastRunFinishedAt *time.Time
	LastOutcome       string
	LastError         string
	LastScannedFree   int
	RunsTotal         int
}

// AutoCycleState is a full replacement of the runtime-state columns of the
// auto_cycle row (everything except configuration and enabled flag).
type AutoCycleState struct {
	Phase             string
	RunStartedAt      *time.Time
	NextRunAt         *time.Time
	LastRunStartedAt  *time.Time
	LastRunFinishedAt *time.Time
	LastOutcome       string
	LastError         string
	LastScannedFree   int
	RunsTotal         int
}