package storage

import (
	"context"
	"time"
)

// LoginAttempt represents a deduplicated login attempt.
type LoginAttempt struct {
	ID        int64
	Username  string
	Password  string
	IP        string
	Country   string
	Count     int
	FirstSeen time.Time
	LastSeen  time.Time
}

// Session represents an authenticated SSH session.
type Session struct {
	ID             string
	IP             string
	Country        string
	Username       string
	ShellName      string
	ConnectedAt    time.Time
	DisconnectedAt *time.Time
	HumanScore     *float64
}

// SessionLog represents a single log entry for a session.
type SessionLog struct {
	ID        int64
	SessionID string
	Timestamp time.Time
	Input     string
	Output    string
}

// SessionEvent represents a single I/O event recorded during a session.
type SessionEvent struct {
	SessionID string
	Timestamp time.Time
	Direction int // 0=input (client→server), 1=output (server→client)
	Data      []byte
}

// DashboardStats holds aggregate counts for the web dashboard.
type DashboardStats struct {
	TotalAttempts  int64
	UniqueIPs      int64
	TotalSessions  int64
	ActiveSessions int64
}

// TopEntry represents a value and its count for top-N queries.
type TopEntry struct {
	Value   string
	Country string // populated by GetTopIPs
	Count   int64
}

// Store is the interface for persistent storage of honeypot data.
type Store interface {
	// RecordLoginAttempt upserts a login attempt, incrementing the count
	// for existing (username, password, ip) combinations.
	RecordLoginAttempt(ctx context.Context, username, password, ip, country string) error

	// CreateSession creates a new session record and returns its UUID.
	CreateSession(ctx context.Context, ip, username, shellName, country string) (string, error)

	// EndSession sets the disconnected_at timestamp for a session.
	EndSession(ctx context.Context, sessionID string, disconnectedAt time.Time) error

	// UpdateHumanScore sets the human detection score for a session.
	UpdateHumanScore(ctx context.Context, sessionID string, score float64) error

	// AppendSessionLog adds a log entry to a session.
	AppendSessionLog(ctx context.Context, sessionID, input, output string) error

	// DeleteRecordsBefore removes all records older than the given cutoff
	// and returns the total number of deleted rows.
	DeleteRecordsBefore(ctx context.Context, cutoff time.Time) (int64, error)

	// GetDashboardStats returns aggregate counts for the dashboard.
	GetDashboardStats(ctx context.Context) (*DashboardStats, error)

	// GetTopUsernames returns the top N usernames by total attempt count.
	GetTopUsernames(ctx context.Context, limit int) ([]TopEntry, error)

	// GetTopPasswords returns the top N passwords by total attempt count.
	GetTopPasswords(ctx context.Context, limit int) ([]TopEntry, error)

	// GetTopIPs returns the top N IPs by total attempt count.
	GetTopIPs(ctx context.Context, limit int) ([]TopEntry, error)

	// GetTopCountries returns the top N countries by total attempt count.
	GetTopCountries(ctx context.Context, limit int) ([]TopEntry, error)

	// GetRecentSessions returns the most recent sessions ordered by connected_at DESC.
	// If activeOnly is true, only sessions with no disconnected_at are returned.
	GetRecentSessions(ctx context.Context, limit int, activeOnly bool) ([]Session, error)

	// GetSession returns a single session by ID.
	GetSession(ctx context.Context, sessionID string) (*Session, error)

	// GetSessionLogs returns all log entries for a session ordered by timestamp.
	GetSessionLogs(ctx context.Context, sessionID string) ([]SessionLog, error)

	// AppendSessionEvents batch-inserts session events.
	AppendSessionEvents(ctx context.Context, events []SessionEvent) error

	// GetSessionEvents returns all events for a session ordered by id.
	GetSessionEvents(ctx context.Context, sessionID string) ([]SessionEvent, error)

	// CloseActiveSessions sets disconnected_at for all sessions that are
	// still marked as active. This should be called at startup to clean up
	// sessions left over from a previous unclean shutdown.
	CloseActiveSessions(ctx context.Context, disconnectedAt time.Time) (int64, error)

	// Close releases any resources held by the store.
	Close() error
}