package auth

import (
	"context"
	"fmt"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"
)

// RoleManager handles role-based access control
type RoleManager struct {
	db *pgxpool.Pool
}

// NewRoleManager creates a new role manager
func NewRoleManager(db *pgxpool.Pool) *RoleManager {
	return &RoleManager{db: db}
}

// UserRole represents a user's role and track assignment
type UserRole struct {
	Address    string
	Track      int
	Roles      []string
	Approved   bool
	ApprovedBy string
	ApprovedAt time.Time
}

// AssignTrack assigns a track level to a user address
func (r *RoleManager) AssignTrack(ctx context.Context, address string, track int, approvedBy string) error {
	if track < 1 || track > 4 {
		return fmt.Errorf("invalid track level: %d (must be 1-4)", track)
	}

	query := `
		INSERT INTO operator_roles (address, track_level, approved, approved_by, approved_at)
		VALUES ($1, $2, $3, $4, $5)
		ON CONFLICT (address) DO UPDATE SET
			track_level = EXCLUDED.track_level,
			approved = EXCLUDED.approved,
			approved_by = EXCLUDED.approved_by,
			approved_at = EXCLUDED.approved_at,
			updated_at = NOW()
	`

	_, err := r.db.Exec(ctx, query, address, track, true, approvedBy, time.Now())
	if err != nil {
		return fmt.Errorf("failed to assign track: %w", err)
	}

	return nil
}

// GetUserRole gets the role and track for a user address
func (r *RoleManager) GetUserRole(ctx context.Context, address string) (*UserRole, error) {
	var role UserRole
	query := `
		SELECT address, track_level, roles, approved, approved_by, approved_at
		FROM operator_roles
		WHERE address = $1
	`

	err := r.db.QueryRow(ctx, query, address).Scan(
		&role.Address,
		&role.Track,
		&role.Roles,
		&role.Approved,
		&role.ApprovedBy,
		&role.ApprovedAt,
	)

	if err != nil {
		// User not found, return default Track 1
		return &UserRole{
			Address:  address,
			Track:    1,
			Roles:    []string{},
			Approved: false,
		}, nil
	}

	return &role, nil
}

// ApproveUser approves a user for their assigned track
func (r *RoleManager) ApproveUser(ctx context.Context, address string, approvedBy string) error {
	query := `
		UPDATE operator_roles
		SET approved = TRUE,
		    approved_by = $2,
		    approved_at = NOW(),
		    updated_at = NOW()
		WHERE address = $1
	`

	result, err := r.db.Exec(ctx, query, address, approvedBy)
	if err != nil {
		return fmt.Errorf("failed to approve user: %w", err)
	}

	if result.RowsAffected() == 0 {
		return fmt.Errorf("user not found")
	}

	return nil
}

// RevokeUser revokes a user's approval
func (r *RoleManager) RevokeUser(ctx context.Context, address string) error {
	query := `
		UPDATE operator_roles
		SET approved = FALSE,
		    approved_at = NULL,
		    updated_at = NOW()
		WHERE address = $1
	`

	result, err := r.db.Exec(ctx, query, address)
	if err != nil {
		return fmt.Errorf("failed to revoke user: %w", err)
	}

	if result.RowsAffected() == 0 {
		return fmt.Errorf("user not found")
	}

	return nil
}

// AddIPWhitelist adds an IP address to the whitelist for an operator
func (r *RoleManager) AddIPWhitelist(ctx context.Context, operatorAddress string, ipAddress string, description string) error {
	query := `
		INSERT INTO operator_ip_whitelist (operator_address, ip_address, description)
		VALUES ($1, $2, $3)
		ON CONFLICT (operator_address, ip_address) DO UPDATE SET
			description = EXCLUDED.description
	`

	_, err := r.db.Exec(ctx, query, operatorAddress, ipAddress, description)
	if err != nil {
		return fmt.Errorf("failed to add IP to whitelist: %w", err)
	}

	return nil
}

// IsIPWhitelisted checks if an IP address is whitelisted for an operator
func (r *RoleManager) IsIPWhitelisted(ctx context.Context, operatorAddress string, ipAddress string) (bool, error) {
	var count int
	query := `
		SELECT COUNT(*)
		FROM operator_ip_whitelist
		WHERE operator_address = $1 AND ip_address = $2
	`

	err := r.db.QueryRow(ctx, query, operatorAddress, ipAddress).Scan(&count)
	if err != nil {
		return false, fmt.Errorf("failed to check IP whitelist: %w", err)
	}

	return count > 0, nil
}

// LogOperatorEvent logs an operator event for audit purposes
func (r *RoleManager) LogOperatorEvent(ctx context.Context, eventType string, chainID *int, operatorAddress string, targetResource string, action string, details map[string]interface{}, ipAddress string, userAgent string) error {
	query := `
		INSERT INTO operator_events (event_type, chain_id, operator_address, target_resource, action, details, ip_address, user_agent)
		VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
	`

	// Convert details map to JSONB
	detailsJSON := map[string]interface{}(details)

	_, err := r.db.Exec(ctx, query, eventType, chainID, operatorAddress, targetResource, action, detailsJSON, ipAddress, userAgent)
	if err != nil {
		return fmt.Errorf("failed to log operator event: %w", err)
	}

	return nil
}