package report

import (
	"context"

	"fmt"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"go.uber.org/zap"
)

type BetIntervalRow struct {
	Period               string `csv:"Period"`
	TotalBets            int64  `csv:"Total Bets"`
	TotalStake           int64  `csv:"Total Stake"`
	ActiveBets           int64  `csv:"Active Bets"`
	TotalWins            int64  `csv:"Total Wins"`
	TotalLosses          int64  `csv:"Total Losses"`
	WinBalance           int64  `csv:"Win Balance"`
	NumberOfUnsettled    int64  `csv:"Number Of Unsettled"`
	TotalUnsettledAmount int64  `csv:"Total Unsettled Amount"`
	TotalShopBets        int64  `csv:"Total Shop Bets"`
}

func (s *Service) GenerateBetIntervalReport(ctx context.Context, request domain.ReportRequestDetail) (string, error) {
	if request.Metadata.Interval == nil {
		s.mongoLogger.Error("[GenerateBetIntervalReport] Metadata interval is empty")
		return "", domain.ErrInvalidInterval
	}

	interval, err := domain.ParseDateInterval(*request.Metadata.Interval)
	if err != nil {
		s.mongoLogger.Error("[GenerateBetIntervalReport] Failed to parse date interval",
			zap.String("interval", *request.Metadata.Interval),
			zap.Error(err),
		)
		return "", domain.ErrInvalidInterval
	}

	stats, err := s.statService.GetBetStatsByInterval(ctx, domain.BetStatsByIntervalFilter{
		Interval: domain.ValidDateInterval{
			Value: interval,
			Valid: true,
		},
		CompanyID: request.CompanyID,
	})
	if err != nil {
		s.mongoLogger.Error("[GenerateBetIntervalReport] Failed to fetch bet stats",
			zap.String("interval", string(interval)),
			zap.Error(err),
		)
		return "", fmt.Errorf("fetching bet stats: %w", err)
	}

	var rows [][]string
	var headers []string
	for _, stat := range stats {
		endDate, err := domain.GetEndDateFromInterval(interval, stat.Date)
		if err != nil {
			s.mongoLogger.Error("[GenerateBetIntervalReport] Failed to get end date from interval",
				zap.String("interval", string(interval)),
				zap.Error(err),
			)
			return "", fmt.Errorf("invalid interval end date: %w", err)
		}

		period := fmt.Sprintf("%s to %s",
			stat.Date.Format("2006-01-02"),
			endDate.Format("2006-01-02"),
		)

		r := BetIntervalRow{
			Period:               period,
			TotalBets:            stat.TotalBets,
			TotalStake:           stat.TotalStake,
			ActiveBets:           stat.ActiveBets,
			TotalWins:            stat.TotalWins,
			TotalLosses:          stat.TotalLosses,
			WinBalance:           stat.WinBalance,
			NumberOfUnsettled:    stat.NumberOfUnsettled,
			TotalUnsettledAmount: stat.TotalUnsettledAmount,
			TotalShopBets:        stat.TotalShopBets,
		}

		if headers == nil {
			headers, _ = StructToCSVRow(r)
			rows = append(rows, headers)
		}

		_, row := StructToCSVRow(r)
		rows = append(rows, row)
	}

	return s.WriteCSV(rows, "bet_interval")
}