package services

import (
	"database/sql"
	"fmt"
	"log"
	"synlotto-website/handlers"
	"synlotto-website/helpers"
	"synlotto-website/models"
	"synlotto-website/rules"
	draws "synlotto-website/services/draws"
)

func RunTicketMatching(db *sql.DB, triggeredBy string) (models.MatchRunStats, error) {
	stats := models.MatchRunStats{}

	rows, err := db.Query(`
		SELECT id, game_type, draw_date,
		       ball1, ball2, ball3, ball4, ball5, ball6,
		       bonus1, bonus2
		FROM my_tickets
		WHERE matched_main IS NULL
	`)
	if err != nil {
		return stats, err
	}
	defer rows.Close()

	// Buffer results to avoid writing while iterating
	var pending []models.Ticket

	for rows.Next() {
		var t models.Ticket
		var b1, b2, b3, b4, b5, b6, bo1, bo2 sql.NullInt64

		if err := rows.Scan(
			&t.Id, &t.GameType, &t.DrawDate,
			&b1, &b2, &b3, &b4, &b5, &b6,
			&bo1, &bo2,
		); err != nil {
			continue
		}

		t.Ball1 = int(b1.Int64)
		t.Ball2 = int(b2.Int64)
		t.Ball3 = int(b3.Int64)
		t.Ball4 = int(b4.Int64)
		t.Ball5 = int(b5.Int64)
		t.Ball6 = int(b6.Int64)
		t.Bonus1 = helpers.IntPtrIfValid(bo1)
		t.Bonus2 = helpers.IntPtrIfValid(bo2)

		pending = append(pending, t)
	}

	for _, t := range pending {
		matchTicket := models.MatchTicket{
			ID:         t.Id,
			GameType:   t.GameType,
			DrawDate:   t.DrawDate,
			Balls:      helpers.BuildBallsSlice(t),
			BonusBalls: helpers.BuildBonusSlice(t),
		}

		draw := draws.GetDrawResultForTicket(db, t.GameType, t.DrawDate)
		result := handlers.MatchTicketToDraw(matchTicket, draw, rules.ThunderballPrizeRules)

		if result.MatchedDrawID == 0 {
			continue
		}

		_, err := db.Exec(`
			UPDATE my_tickets
			SET matched_main = ?, matched_bonus = ?, prize_tier = ?, is_winner = ?
			WHERE id = ?
		`, result.MatchedMain, result.MatchedBonus, result.PrizeTier, result.IsWinner, t.Id)
		if err != nil {
			log.Println("⚠️ Failed to update ticket match:", err)
			continue
		}

		stats.TicketsMatched++
		if result.IsWinner {
			stats.WinnersFound++
		}
	}

	_, _ = db.Exec(`
		INSERT INTO log_ticket_matching (triggered_by, tickets_matched, winners_found)
		VALUES (?, ?, ?)
	`, triggeredBy, stats.TicketsMatched, stats.WinnersFound)

	return stats, nil
}

func UpdateMissingPrizes(db *sql.DB) error {
	type TicketInfo struct {
		ID       int
		GameType string
		DrawDate string
		Main     int
		Bonus    int
	}

	var tickets []TicketInfo

	// Step 1: Load all relevant tickets
	rows, err := db.Query(`
		SELECT id, game_type, draw_date, matched_main, matched_bonus
		FROM my_tickets
		WHERE is_winner = 1 AND (prize_label IS NULL OR prize_label = '')
	`)
	if err != nil {
		return err
	}
	defer rows.Close()

	for rows.Next() {
		var t TicketInfo
		if err := rows.Scan(&t.ID, &t.GameType, &t.DrawDate, &t.Main, &t.Bonus); err != nil {
			log.Println("⚠️ Failed to scan row:", err)
			continue
		}
		tickets = append(tickets, t)
	}

	// Step 2: Now that the reader is closed, perform updates
	for _, t := range tickets {
		if t.GameType != "Thunderball" {
			continue
		}

		idx, ok := rules.GetThunderballPrizeIndex(t.Main, t.Bonus)
		if !ok {
			log.Printf("❌ No index for %d main, %d bonus", t.Main, t.Bonus)
			continue
		}

		query := fmt.Sprintf(`SELECT prize%d_per_winner FROM prizes_thunderball WHERE draw_date = ?`, idx)

		var amount int
		err := db.QueryRow(query, t.DrawDate).Scan(&amount)
		if err != nil {
			log.Printf("❌ Prize lookup failed for ticket %d: %v", t.ID, err)
			continue
		}

		label := "Free Ticket"
		if amount > 0 {
			label = fmt.Sprintf("£%.2f", float64(amount))
		}

		_, err = db.Exec(`
			UPDATE my_tickets SET prize_amount = ?, prize_label = ? WHERE id = ?
		`, float64(amount), label, t.ID)

		if err != nil {
			log.Printf("❌ Failed to update ticket %d: %v", t.ID, err)
		} else {
			log.Printf("✅ Updated ticket %d → %s", t.ID, label)
		}
	}

	return nil
}