package rulesengine

import (
	"context"
)

type Dataset interface {
	// validation methods
	EARoles(ctx context.Context, bannerID string, command Command) ([]string, error)

	// admin methods
	AddCommands(ctx context.Context, names []string) (AddNameResult, error)
	AddPrivileges(ctx context.Context, names []string) (AddNameResult, error)
	AddDefaultRules(ctx context.Context, rules []RuleSegment) (AddRuleResult, error)

	DeleteCommand(ctx context.Context, name string) (DeleteResult, error)
	DeletePrivilege(ctx context.Context, name string) (DeleteResult, error)
	DeleteDefaultRule(ctx context.Context, commandName, privilegeName string) (DeleteResult, error)

	ReadAllCommands(ctx context.Context) ([]Command, error)
	ReadCommandsWithFilter(ctx context.Context, names []string) ([]Command, error)
	ReadCommand(ctx context.Context, name string) (Command, error)
	ReadAllPrivileges(ctx context.Context) ([]Privilege, error)
	ReadPrivilegesWithFilter(ctx context.Context, filter []string) ([]Privilege, error)
	ReadPrivilege(ctx context.Context, name string) (Privilege, error)
	ReadAllDefaultRules(ctx context.Context) ([]RuleSegment, error)
	ReadDefaultRulesForCommand(ctx context.Context, commandName string) ([]RuleSegment, error)

	// banner admin methods
	ReadRulesForAllBanners(ctx context.Context) ([]RuleSegment, error)
	AddBannerRules(ctx context.Context, rules []RuleSegment) (feedback AddRuleResult, err error)
	ReadRulesForBanner(ctx context.Context, bannerName string) ([]RuleSegment, error)
	ReadBannerRulesForCommandAndBanner(ctx context.Context, bannerName string, commandName string) ([]RuleSegment, error)
	ReadBannerRulesForCommand(ctx context.Context, commandName string) ([]RuleSegment, error)
	DeletePrivilegeFromBannerRule(ctx context.Context, bannerName, commandName, privilegeName string) (DeleteResult, error)
}

const (
	// maxCommands is the maximum number of commands that can be inserted as a single request.
	maxCommands = 500

	// maxPrivileges is the maximum number of privileges that can be inserted as a single request.
	maxPrivileges = 500

	// maxRules is the maximum number of rules that can be inserted as a single request.
	maxRules = 500
)

type RulesEngine struct {
	ds Dataset
}

func New(ds Dataset) RulesEngine {
	return RulesEngine{ds: ds}
}