package repository

import (
	"context"
	"time"

	"github.com/google/uuid"
)

// ReportTypeCount aggregates growth_reports by type.
type ReportTypeCount struct {
	Type  string `json:"type"`
	Count int    `json:"count"`
}

// BehaviorEventBrief is a recent analytics event for ops insight.
type BehaviorEventBrief struct {
	Name       string    `json:"name"`
	PagePath   string    `json:"page_path,omitempty"`
	ReceivedAt time.Time `json:"received_at"`
}

// CountReportsByType groups non-deleted reports for a user.
func (r *AdminRepo) CountReportsByType(ctx context.Context, userID uuid.UUID) ([]ReportTypeCount, error) {
	rows, err := r.Pool.Query(ctx, `
		SELECT type, count(*)::int FROM growth_reports
		WHERE user_id=$1 AND deleted_at IS NULL
		GROUP BY type ORDER BY count(*) DESC, type ASC`, userID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var out []ReportTypeCount
	for rows.Next() {
		var c ReportTypeCount
		if err := rows.Scan(&c.Type, &c.Count); err != nil {
			return nil, err
		}
		out = append(out, c)
	}
	return out, rows.Err()
}

// CountProfilesForUser returns active profile count.
func (r *AdminRepo) CountProfilesForUser(ctx context.Context, userID uuid.UUID) (int, error) {
	var n int
	err := r.Pool.QueryRow(ctx, `
		SELECT count(*)::int FROM profiles
		WHERE user_id=$1 AND deleted_at IS NULL`, userID).Scan(&n)
	return n, err
}

// CountAskThreadsForUser returns non-deleted ask threads.
func (r *AdminRepo) CountAskThreadsForUser(ctx context.Context, userID uuid.UUID) (int, error) {
	var n int
	err := r.Pool.QueryRow(ctx, `
		SELECT count(*)::int FROM ask_threads
		WHERE user_id=$1 AND deleted_at IS NULL`, userID).Scan(&n)
	return n, err
}

// ListRecentEventsForUser returns recent analytics events (may be empty).
func (r *AdminRepo) ListRecentEventsForUser(ctx context.Context, userID uuid.UUID, limit int) ([]BehaviorEventBrief, error) {
	if limit <= 0 || limit > 50 {
		limit = 20
	}
	rows, err := r.Pool.Query(ctx, `
		SELECT name, coalesce(page_path, ''), received_at
		FROM analytics_events
		WHERE user_id=$1
		ORDER BY received_at DESC
		LIMIT $2`, userID, limit)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var out []BehaviorEventBrief
	for rows.Next() {
		var e BehaviorEventBrief
		if err := rows.Scan(&e.Name, &e.PagePath, &e.ReceivedAt); err != nil {
			return nil, err
		}
		out = append(out, e)
	}
	return out, rows.Err()
}