package store

import (
	"sort"
	"strings"
	"time"

	"github.com/google/uuid"
)

func (m *Memory) AppendAudit(in AuditAppendInput) (*AuditEntry, error) {
	if strings.TrimSpace(in.TenantID) == "" || strings.TrimSpace(in.Action) == "" || strings.TrimSpace(in.Summary) == "" {
		return nil, ErrInvalidInput
	}
	sev := strings.TrimSpace(in.Severity)
	if sev == "" {
		sev = AuditSeverityInfo
	}
	if !ValidAuditSeverity(sev) {
		return nil, ErrInvalidInput
	}
	now := time.Now().UTC()
	row := &AuditEntry{
		ID:                uuid.NewString(),
		TenantID:          strings.TrimSpace(in.TenantID),
		EventID:           "bgp-" + uuid.NewString(),
		SourceApp:         AuditSourceAppBGP,
		Action:            strings.TrimSpace(in.Action),
		Severity:          sev,
		ActorUserID:       strings.TrimSpace(in.ActorUserID),
		ActorEmail:        strings.TrimSpace(in.ActorEmail),
		ActorName:         strings.TrimSpace(in.ActorName),
		ActorAPIKeyPrefix: strings.TrimSpace(in.ActorAPIKeyPrefix),
		TargetType:        strings.TrimSpace(in.TargetType),
		TargetID:          strings.TrimSpace(in.TargetID),
		Summary:           strings.TrimSpace(in.Summary),
		Details:           in.Details,
		IP:                strings.TrimSpace(in.IP),
		CreatedAt:         now,
	}
	m.mu.Lock()
	defer m.mu.Unlock()
	m.auditLog = append(m.auditLog, row)
	return cloneAuditEntry(row), nil
}

func (m *Memory) ListAudit(tenantID, cursor string, limit int, filter AuditListFilter) ([]*AuditEntry, string, bool, error) {
	if limit <= 0 {
		limit = 50
	}
	m.mu.RLock()
	defer m.mu.RUnlock()
	var filtered []*AuditEntry
	for _, row := range m.auditLog {
		if row.TenantID != tenantID {
			continue
		}
		if a := strings.TrimSpace(filter.Action); a != "" && row.Action != a {
			continue
		}
		if s := strings.TrimSpace(filter.Severity); s != "" && row.Severity != s {
			continue
		}
		filtered = append(filtered, row)
	}
	sort.Slice(filtered, func(i, j int) bool {
		if filtered[i].CreatedAt.Equal(filtered[j].CreatedAt) {
			return filtered[i].ID > filtered[j].ID
		}
		return filtered[i].CreatedAt.After(filtered[j].CreatedAt)
	})
	off := parseMaintCursor(cursor)
	end := off + limit
	next := ""
	hasMore := false
	if end > len(filtered) {
		end = len(filtered)
	} else if end < len(filtered) {
		hasMore = true
		next = formatMaintCursor(end)
	}
	if off >= len(filtered) {
		return nil, "", false, nil
	}
	out := make([]*AuditEntry, end-off)
	for i := off; i < end; i++ {
		out[i-off] = cloneAuditEntry(filtered[i])
	}
	return out, next, hasMore, nil
}

func (m *Memory) MarkAuditPortalPushed(id string) error {
	m.mu.Lock()
	defer m.mu.Unlock()
	for _, row := range m.auditLog {
		if row.ID == id {
			now := time.Now().UTC()
			row.PortalPushedAt = &now
			return nil
		}
	}
	return ErrNotFound
}

func cloneAuditEntry(row *AuditEntry) *AuditEntry {
	if row == nil {
		return nil
	}
	cp := *row
	if row.Details != nil {
		cp.Details = make(map[string]any, len(row.Details))
		for k, v := range row.Details {
			cp.Details[k] = v
		}
	}
	return &cp
}