package repository

import (
	"context"
	"electricity_bill_calc/config"
	"electricity_bill_calc/global"
	"electricity_bill_calc/logger"
	"electricity_bill_calc/model"
	"electricity_bill_calc/types"
	"fmt"

	"github.com/doug-martin/goqu/v9"
	_ "github.com/doug-martin/goqu/v9/dialect/postgres"
	"github.com/georgysavva/scany/v2/pgxscan"
	"github.com/jackc/pgx/v5"
	"github.com/samber/lo"
	"go.uber.org/zap"
)

type _ChargeRepository struct {
	log *zap.Logger
	ds  goqu.DialectWrapper
}

var ChargeRepository = &_ChargeRepository{
	log: logger.Named("Repository", "Charge"),
	ds:  goqu.Dialect("postgres"),
}

// 分页查询用户的充值记录
func (cr _ChargeRepository) FindCharges(page uint, beginTime, endTime *types.Date, keyword *string) ([]*model.UserChargeDetail, int64, error) {
	cr.log.Info("查询用户的充值记录。", logger.DateFieldp("beginTime", beginTime), logger.DateFieldp("endTime", endTime), zap.Stringp("keyword", keyword), zap.Uint("page", page))
	ctx, cancel := global.TimeoutContext()
	defer cancel()

	chargeQuery := cr.ds.
		From(goqu.T("user_charge").As("c")).
		Join(goqu.T("user_detail").As("ud"), goqu.On(goqu.I("c.user_id").Eq(goqu.I("ud.id")))).
		Join(goqu.T("user").As("u"), goqu.On(goqu.I("ud.id").Eq(goqu.I("u.id")))).
		Select(
			"c.seq", "c.user_id", "ud.name", "c.fee", "c.discount", "c.amount", "c.charge_to",
			"c.settled", "c.settled_at", "c.cancelled", "c.cancelled_at", "c.refunded", "c.refunded_at", "c.created_at",
		)
	countQuery := cr.ds.
		From(goqu.T("user_charge").As("c")).
		Join(goqu.T("user_detail").As("ud"), goqu.On(goqu.I("c.user_id").Eq(goqu.I("ud.id")))).
		Join(goqu.T("user").As("u"), goqu.On(goqu.I("ud.id").Eq(goqu.I("u.id")))).
		Select(goqu.COUNT("*"))

	if keyword != nil && len(*keyword) > 0 {
		pattern := fmt.Sprintf("%%%s%%", *keyword)
		chargeQuery = chargeQuery.Where(goqu.Or(
			goqu.I("ud.name").ILike(pattern),
			goqu.I("ud.abbr").ILike(pattern),
			goqu.I("u.username").ILike(pattern),
		))
		countQuery = countQuery.Where(goqu.Or(
			goqu.I("ud.name").ILike(pattern),
			goqu.I("ud.abbr").ILike(pattern),
			goqu.I("u.username").ILike(pattern),
		))
	}

	if beginTime != nil {
		chargeQuery = chargeQuery.Where(goqu.I("c.created_at").Gte(beginTime.ToBeginningOfDate()))
		countQuery = countQuery.Where(goqu.I("c.created_at").Gte(beginTime.ToBeginningOfDate()))
	}

	if endTime != nil {
		chargeQuery = chargeQuery.Where(goqu.I("c.created_at").Lte(endTime.ToEndingOfDate()))
		countQuery = countQuery.Where(goqu.I("c.created_at").Lte(endTime.ToEndingOfDate()))
	}

	chargeQuery = chargeQuery.Order(goqu.I("c.created_at").Desc())

	currentPostion := (page - 1) * config.ServiceSettings.ItemsPageSize
	chargeQuery = chargeQuery.Offset(currentPostion).Limit(config.ServiceSettings.ItemsPageSize)

	chargeSql, chargeArgs, _ := chargeQuery.Prepared(true).ToSQL()
	countSql, countArgs, _ := countQuery.Prepared(true).ToSQL()

	var (
		charges []*model.UserChargeDetail = make([]*model.UserChargeDetail, 0)
		total   int64
	)
	if err := pgxscan.Select(ctx, global.DB, &charges, chargeSql, chargeArgs...); err != nil {
		cr.log.Error("查询用户的充值记录失败。", zap.Error(err))
		return make([]*model.UserChargeDetail, 0), 0, err
	}
	if err := pgxscan.Get(ctx, global.DB, &total, countSql, countArgs...); err != nil {
		cr.log.Error("查询用户的充值记录总数失败。", zap.Error(err))
		return make([]*model.UserChargeDetail, 0), 0, err
	}
	return charges, total, nil
}

// 在用户充值记录中创建一条新的记录
func (cr _ChargeRepository) CreateChargeRecord(tx pgx.Tx, ctx context.Context, uid string, fee, discount, amount *float64, chargeTo types.Date) (bool, error) {
	createQuery, createArgs, _ := cr.ds.
		Insert(goqu.T("user_charge")).
		Cols("user_id", "fee", "discount", "amount", "charge_to", "created_at").
		Vals(goqu.Vals{uid, fee, discount, amount, chargeTo, types.Now()}).
		Prepared(true).ToSQL()

	rs, err := tx.Exec(ctx, createQuery, createArgs...)
	if err != nil {
		cr.log.Error("创建用户充值记录失败。", zap.Error(err))
		return false, err
	}
	return rs.RowsAffected() > 0, nil
}

// 撤销用户的充值记录
func (cr _ChargeRepository) CancelCharge(tx pgx.Tx, ctx context.Context, uid string, seq int64) (bool, error) {
	updateQuerySql, updateArgs, _ := cr.ds.
		Update(goqu.T("user_charge")).
		Set(goqu.Record{"cancelled": true, "cancelled_at": types.Now()}).
		Where(goqu.I("user_id").Eq(uid), goqu.I("seq").Eq(seq)).
		Prepared(true).ToSQL()

	rs, err := tx.Exec(ctx, updateQuerySql, updateArgs...)
	if err != nil {
		cr.log.Error("撤销用户的充值记录失败。", zap.Error(err))
		return false, err
	}
	return rs.RowsAffected() > 0, nil
}

// 检索用户最近有效的服务期限
func (cr _ChargeRepository) LatestValidChargeTo(tx pgx.Tx, ctx context.Context, uid string) (*types.Date, error) {
	searchSql, searchArgs, _ := cr.ds.
		From(goqu.T("user_charge")).
		Select("charge_to").
		Where(
			goqu.I("settled").Eq(true),
			goqu.I("cancelled").Eq(false),
			goqu.I("refunded").Eq(false),
			goqu.I("user_id").Eq(uid),
		).
		Prepared(true).ToSQL()

	var chargeTo []*types.Date
	if err := pgxscan.Select(ctx, tx, &chargeTo, searchSql, searchArgs...); err != nil {
		cr.log.Error("检索用户有效服务期限列表失败。", zap.Error(err))
		return nil, err
	}
	if len(chargeTo) == 0 {
		return nil, fmt.Errorf("无法找到用户最近的有效服务期限。")
	}
	lastCharge := lo.MaxBy(chargeTo, func(a, b *types.Date) bool { return a.Time.After(b.Time) })
	return lastCharge, nil
}