package handler

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

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

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

type TransactionImpl struct {
	s service.Transaction
	a service.Auth
	r *Render
}

func NewTransaction(s service.Transaction, a service.Auth, r *Render) Transaction {
	return TransactionImpl{
		s: s,
		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("DELETE /transaction/{id}", h.handleDeleteTransaction())
}

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
		}

		comp := t.Transaction(transactions)
		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
		}

		id := r.PathValue("id")
		if id == "new" {
			comp := t.EditTransaction(nil)
			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)
		} else {
			comp = t.TransactionItem(transaction)
		}
		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
		)
		id := r.PathValue("id")
		name := r.FormValue("name")
		if id == "new" {
			transaction, err = h.s.Add(user, name)
			if err != nil {
				handleError(w, r, err)
				return
			}
		} else {
			transaction, err = h.s.Update(user, id, name)
			if err != nil {
				handleError(w, r, err)
				return
			}
		}

		comp := t.TransactionItem(transaction)
		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
		}
	}
}