package domain

import (
	"fmt"
	"git.cin.su/m/Assistant/contracts/configuration"
	"sort"
)

var ErrInvalidConfigurationCommand = fmt.Errorf("invalid conversational configuration command")

func Resolve(definition configuration.SettingDefinition, assignments []configuration.SettingAssignment, selector configuration.ScopeSelector) (configuration.EffectiveSetting, error) {
	if err := definition.Validate(); err != nil {
		return configuration.EffectiveSetting{}, err
	}
	var matches []configuration.SettingAssignment
	for _, a := range assignments {
		if err := a.Validate(); err != nil {
			return configuration.EffectiveSetting{}, err
		}
		if a.DefinitionRef == string(definition.ID) && a.Lifecycle == configuration.SettingActive && a.Selector.PrincipalRef == selector.PrincipalRef && a.Selector.SkillRef == selector.SkillRef {
			matches = append(matches, a)
		}
	}
	if len(matches) == 0 {
		return configuration.EffectiveSetting{DefinitionRef: string(definition.ID), Value: definition.DefaultValue, ResolutionTrace: []string{"system-default"}}, nil
	}
	sort.SliceStable(matches, func(i, j int) bool { return specificity(matches[i].Selector) > specificity(matches[j].Selector) })
	if len(matches) > 1 && specificity(matches[0].Selector) == specificity(matches[1].Selector) {
		return configuration.EffectiveSetting{}, fmt.Errorf("configuration conflict")
	}
	return configuration.EffectiveSetting{DefinitionRef: string(definition.ID), Value: matches[0].TypedValue, WinningAssignmentRef: string(matches[0].ID), ResolutionTrace: []string{"specificity-selected"}}, nil
}
func specificity(s configuration.ScopeSelector) int {
	return len(s.RequiredContextBindings) + boolInt(s.SkillRef != "") + boolInt(s.TaskRef != "") + boolInt(s.SessionRef != "") + boolInt(s.TemporaryOverride)
}
func boolInt(v bool) int {
	if v {
		return 1
	}
	return 0
}