package endpoints

import (
	"encoding/json"
	"net/http"
	"time"

	. "github.com/imosed/signet/data"
	"github.com/rs/zerolog/log"
	"gorm.io/gorm/clause"
)

type Total struct {
	AmountHeld float64 `json:"amountHeld"`
}

type GetRewardFundRequest struct {
	ID                       uint `json:"id"`
	ConsolidateContributions bool `json:"consolidateContributions"`
}

type GetRewardFundResponse struct {
	FundInfo      FundInfo      `json:"fundInfo"`
	Contributions Contributions `json:"contributions"`
	Total         Total         `json:"total"`
}

func GetRewardFund(resp http.ResponseWriter, req *http.Request) {
	var fund RewardFund
	var contribs Contributions
	var amountHeld Total

	var requestedFund GetRewardFundRequest
	dec := json.NewDecoder(req.Body)
	err := dec.Decode(&requestedFund)
	if err != nil {
		log.Error().Err(err).Msg("Could not read requested fund")
	}

	found := Db.Preload(clause.Associations).Find(&fund, requestedFund.ID).RowsAffected
	if found == 0 {
		resp.WriteHeader(404)
		return
	}
	Db.Table("contributions").Select("distinct on (created_at::TIMESTAMP::DATE) created_at").Where("reward_fund_id = ?", fund.ID).Scan(&contribs.Dates)
	baseQuery := Db.Table("contributions").Where("reward_fund_id = ?", fund.ID).Limit(30)
	baseCount := Db.Table("contributions").Where("reward_fund_id = ?", fund.ID)
	Db.Table("contributions").Select("sum(amount) amount_held").Where("reward_fund_id = ?", fund.ID).Scan(&amountHeld)

	if requestedFund.ConsolidateContributions {
		baseQuery.Select("wallet, sum(amount) amount").Group("wallet").Order("wallet").Scan(&contribs.List)
		baseCount.Group("wallet").Count(&contribs.Total)
	} else {
		baseQuery.Select("wallet, amount, created_at").Order("created_at desc").Scan(&contribs.List)
		baseCount.Count(&contribs.Total)
	}

	r := GetRewardFundResponse{
		FundInfo: FundInfo{
			ID:              fund.ID,
			CreatedAt:       fund.CreatedAt,
			Asset:           fund.Asset,
			FundWallet:      fund.FundWallet,
			IssuerWallet:    fund.IssuerWallet,
			Memo:            fund.Memo,
			Price:           fund.Price,
			AmountAvailable: fund.AmountAvailable,
			MinContribution: fund.MinContribution,
			TelegramLink:    fund.TelegramLink,
			Bonuses:         fund.Bonuses,
		},
		Contributions: contribs,
		Total:         amountHeld,
	}

	err = json.NewEncoder(resp).Encode(r)
	if err != nil {
		log.Error().Err(err).Msg("Could not deliver requested fund")
	}
}

type GetContributionsRequest struct {
	ID                       uint   `json:"id"`
	Offset                   int    `json:"offset"`
	ForDate                  string `json:"forDate"`
	ConsolidateContributions bool   `json:"consolidateContributions"`
}

type Contributions struct {
	List  []Contribution `json:"list"`
	Dates []string       `json:"dates"`
	Total int64          `json:"total"`
}

type GetContributionsResponse = Contributions

func GetContributions(w http.ResponseWriter, r *http.Request) {
	var req GetContributionsRequest
	err := json.NewDecoder(r.Body).Decode(&req)
	if err != nil {
		log.Error().Err(err).Msg("Could not decode body in GetContributions call")
		return
	}

	var resp GetContributionsResponse
	baseQuery := Db.Table("contributions").Where("reward_fund_id = ?", req.ID).Offset(req.Offset).Limit(30)
	baseCount := Db.Table("contributions").Where("reward_fund_id = ?", req.ID)

	Db.Table("contributions").Select("distinct on (created_at::TIMESTAMP::DATE) created_at").Where("reward_fund_id = ?", req.ID).Scan(&resp.Dates)

	if req.ForDate == "" {
		if req.ConsolidateContributions {
			baseQuery.Select("wallet, sum(amount) amount").Group("wallet").Scan(&resp.List)
			baseCount.Group("wallet").Count(&resp.Total)
		} else {
			baseQuery.Select("wallet, amount, created_at").Order("created_at desc").Scan(&resp.List)
			baseCount.Count(&resp.Total)
		}
	} else {
		var t time.Time
		t, err = time.Parse("2006-Jan-02", req.ForDate)
		t = t.Add(time.Hour * 24)
		if err != nil {
			log.Error().Err(err).Msg("Could not interpret time")
			return
		}
		if req.ConsolidateContributions {
			baseQuery.Select("wallet, sum(amount) amount").Where("created_at < ?", t).Group("wallet").Scan(&resp.List)
			baseCount.Where("created_at < ?", t).Group("wallet").Count(&resp.Total)
		} else {
			baseQuery.Select("wallet, amount, created_at").Where("created_at < ?", t).Order("created_at desc").Scan(&resp.List)
			baseCount.Where("created_at < ?", t).Count(&resp.Total)
		}
	}

	err = json.NewEncoder(w).Encode(resp)
	if err != nil {
		log.Error().Err(err).Msg("Could not deliver response in GetContributions call")
	}
}

type FundInfo struct {
	ID              uint      `json:"id"`
	CreatedAt       time.Time `json:"createdAt"`
	Asset           string    `json:"asset"`
	FundWallet      string    `json:"fundWallet"`
	IssuerWallet    string    `json:"issuerWallet"`
	Memo            string    `json:"memo"`
	Price           float64   `json:"price"`
	AmountAvailable float64   `json:"amountAvailable"`
	MinContribution float64   `json:"minContribution"`
	TelegramLink    string    `json:"telegramLink"`
	Bonuses         []Bonus   `json:"bonuses"`
}