package evolution

import (
	"errors"
	"os"
	"strings"
	"time"
)

func SaveAppliedProfile(store *Store, workspace string, draft SkillDraft, now time.Time) error {
	profile, err := store.LoadProfile(draft.TargetSkillName)
	if err != nil && !errors.Is(err, os.ErrNotExist) {
		return err
	}
	if errors.Is(err, os.ErrNotExist) {
		profile = SkillProfile{
			SkillName:   draft.TargetSkillName,
			WorkspaceID: workspace,
			Origin:      "evolved",
		}
	}

	profile.SkillName = draft.TargetSkillName
	profile.WorkspaceID = workspace
	profile.CurrentVersion = draft.ID
	profile.Status = SkillStatusActive
	profile.Origin = profileOrigin(profile.Origin)
	profile.HumanSummary = draft.HumanSummary
	profile.ChangeReason = draft.HumanSummary
	profile.IntendedUseCases = append([]string(nil), draft.IntendedUseCases...)
	profile.PreferredEntryPath = append([]string(nil), draft.PreferredEntryPath...)
	profile.AvoidPatterns = append([]string(nil), draft.AvoidPatterns...)
	profile.LastUsedAt = now
	if profile.RetentionScore <= 0 {
		profile.RetentionScore = 1
	}
	profile.VersionHistory = append(profile.VersionHistory, SkillVersionEntry{
		Version:   draft.ID,
		Action:    string(draft.ChangeKind),
		Timestamp: now,
		DraftID:   draft.ID,
		Summary:   draft.HumanSummary,
	})
	return store.SaveProfile(profile)
}

func inferIntendedUseCases(rule LearningRecord) []string {
	summary := strings.TrimSpace(rule.Summary)
	if summary == "" {
		return nil
	}
	return []string{summary}
}

func inferPreferredEntryPath(rule LearningRecord) []string {
	if len(rule.WinningPath) == 0 {
		return nil
	}
	return append([]string(nil), rule.WinningPath...)
}

func inferAvoidPatterns(rule LearningRecord) []string {
	if len(rule.LateAddedSkills) == 0 || len(rule.WinningPath) <= len(rule.LateAddedSkills) {
		return nil
	}
	prefix := rule.WinningPath[:len(rule.WinningPath)-len(rule.LateAddedSkills)]
	if len(prefix) == 0 {
		return nil
	}
	return []string{
		"avoid starting with " + strings.Join(prefix, " -> ") + " before using " + strings.Join(rule.LateAddedSkills, " -> "),
	}
}