package handler

import (
	"net/http"
	"spend-sparrow/handler/middleware"
	"spend-sparrow/log"
	"spend-sparrow/service"
	t "spend-sparrow/template/transaction"
	"spend-sparrow/types"
	"spend-sparrow/utils"

	"github.com/a-h/templ"
	"github.com/google/uuid"
)

type Transaction interface {
	Handle(router *http.ServeMux)
}

type TransactionImpl struct {
	s             service.Transaction
	account       service.Account
	treasureChest service.TreasureChest
	a             service.Auth
	r             *Render
}

func NewTransaction(s service.Transaction, account service.Account, treasureChest service.TreasureChest, a service.Auth, r *Render) Transaction {
	return TransactionImpl{
		s:             s,
		account:       account,
		treasureChest: treasureChest,
		a:             a,
		r:             r,
	}
}

func (h TransactionImpl) Handle(r *http.ServeMux) {
	r.Handle("GET /transaction", h.handleTransactionPage())
	r.Handle("GET /transaction/{id}", h.handleTransactionItemComp())
	r.Handle("POST /transaction/{id}", h.handleUpdateTransaction())
	r.Handle("POST /transaction/recalculate", h.handleRecalculate())
	r.Handle("DELETE /transaction/{id}", h.handleDeleteTransaction())
}

func (h TransactionImpl) handleRecalculate() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user := middleware.GetUser(r)
		if user == nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		err := h.s.RecalculateBalances(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		utils.TriggerToastWithStatus(w, r, "success", "Balances recalculated", http.StatusOK)
	}
}

func (h TransactionImpl) handleTransactionPage() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user := middleware.GetUser(r)
		if user == nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		transactions, err := h.s.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		accounts, err := h.account.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		treasureChests, err := h.treasureChest.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		accountMap, treasureChestMap := h.getTransactionData(accounts, treasureChests)

		comp := t.Transaction(transactions, accountMap, treasureChestMap)
		h.r.RenderLayout(r, w, comp, user)
	}
}

func (h TransactionImpl) handleTransactionItemComp() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user := middleware.GetUser(r)
		if user == nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		accounts, err := h.account.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		treasureChests, err := h.treasureChest.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		id := r.PathValue("id")
		if id == "new" {
			comp := t.EditTransaction(nil, accounts, treasureChests)
			h.r.Render(r, w, comp)
			return
		}

		transaction, err := h.s.Get(user, id)
		if err != nil {
			handleError(w, r, err)
			return
		}

		var comp templ.Component
		if r.URL.Query().Get("edit") == "true" {
			comp = t.EditTransaction(transaction, accounts, treasureChests)
		} else {
			accountMap, treasureChestMap := h.getTransactionData(accounts, treasureChests)
			comp = t.TransactionItem(transaction, accountMap, treasureChestMap)
		}
		h.r.Render(r, w, comp)
	}
}

func (h TransactionImpl) handleUpdateTransaction() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user := middleware.GetUser(r)
		if user == nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		var (
			transaction *types.Transaction
			err         error
		)
		input := types.TransactionInput{
			Id:                    r.PathValue("id"),
			AccountId:             r.FormValue("account-id"),
			TreasureChestId:       r.FormValue("treasure-chest-id"),
			Value:                 r.FormValue("value"),
			Timestamp:             r.FormValue("timestamp"),
			TimezoneOffsetMinutes: r.FormValue("timezone-offset"),
			Note:                  r.FormValue("note"),
		}

		if input.Id == "new" {
			transaction, err = h.s.Add(user, input)
			if err != nil {
				handleError(w, r, err)
				return
			}
		} else {
			transaction, err = h.s.Update(user, input)
			if err != nil {
				handleError(w, r, err)
				return
			}
		}

		accounts, err := h.account.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		treasureChests, err := h.treasureChest.GetAll(user)
		if err != nil {
			handleError(w, r, err)
			return
		}

		accountMap, treasureChestMap := h.getTransactionData(accounts, treasureChests)
		comp := t.TransactionItem(transaction, accountMap, treasureChestMap)
		h.r.Render(r, w, comp)
	}
}

func (h TransactionImpl) handleDeleteTransaction() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user := middleware.GetUser(r)
		if user == nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		id := r.PathValue("id")

		err := h.s.Delete(user, id)
		if err != nil {
			handleError(w, r, err)
			return
		}
	}
}

func (h TransactionImpl) getTransactionData(accounts []*types.Account, treasureChests []*types.TreasureChest) (map[uuid.UUID]string, map[uuid.UUID]string) {
	accountMap := make(map[uuid.UUID]string, 0)
	for _, account := range accounts {
		accountMap[account.Id] = account.Name
	}
	treasureChestMap := make(map[uuid.UUID]string, 0)
	root := ""
	for _, treasureChest := range treasureChests {
		if treasureChest.ParentId == uuid.Nil {
			root = treasureChest.Name + " > "
			treasureChestMap[treasureChest.Id] = treasureChest.Name
		} else {
			treasureChestMap[treasureChest.Id] = root + treasureChest.Name
		}
	}
	log.Info("treasureChestMap: %v", treasureChestMap)
	return accountMap, treasureChestMap
}