package http

import (
	"net/http"
	"strconv"
	"time"

	"git.javil.eu/jacob1123/budgeteer/postgres"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type BudgetingData struct {
	AlwaysNeededData
	Categories       []postgres.GetCategoriesWithBalanceRow
	AvailableBalance postgres.Numeric
	Date             time.Time
	Next             time.Time
	Previous         time.Time
}

func getFirstOfMonth(year, month int, location *time.Location) time.Time {
	return time.Date(year, time.Month(month), 1, 0, 0, 0, 0, location)
}

func getFirstOfMonthTime(date time.Time) time.Time {
	var monthM time.Month
	year, monthM, _ := date.Date()
	month := int(monthM)
	return getFirstOfMonth(year, month, date.Location())
}

func (h *Handler) budgeting(c *gin.Context) {
	budgetID := c.Param("budgetid")
	budgetUUID, err := uuid.Parse(budgetID)
	if err != nil {
		c.Redirect(http.StatusTemporaryRedirect, "/login")
		return
	}

	var firstOfMonth time.Time
	var year, month int
	yearString := c.Param("year")
	monthString := c.Param("month")
	if yearString != "" && monthString != "" {
		year, err = strconv.Atoi(yearString)
		if err != nil {
			c.Redirect(http.StatusTemporaryRedirect, "/budget/"+budgetUUID.String())
			return
		}

		month, err = strconv.Atoi(monthString)
		if err != nil {
			c.Redirect(http.StatusTemporaryRedirect, "/budget/"+budgetUUID.String())
			return
		}

		firstOfMonth = getFirstOfMonth(year, month, time.Now().Location())
	} else {
		firstOfMonth = getFirstOfMonthTime(time.Now())
	}

	firstOfNextMonth := firstOfMonth.AddDate(0, 1, 0)
	firstOfPreviousMonth := firstOfMonth.AddDate(0, -1, 0)

	params := postgres.GetCategoriesWithBalanceParams{
		BudgetID:     budgetUUID,
		FromDate:     firstOfMonth,
		ToDate:       firstOfNextMonth,
		PrevFromDate: firstOfMonth.AddDate(0, -1, 0),
	}
	categories, err := h.Service.DB.GetCategoriesWithBalance(c.Request.Context(), params)
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	availableParams := postgres.GetAvailableBalanceParams{
		BudgetID: budgetUUID,
		FromDate: firstOfNextMonth,
	}
	availableBalance, err := h.Service.DB.GetAvailableBalance(c.Request.Context(), availableParams)
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	d := BudgetingData{
		c.MustGet("data").(AlwaysNeededData),
		categories,
		availableBalance,
		firstOfMonth,
		firstOfNextMonth,
		firstOfPreviousMonth,
	}

	c.HTML(http.StatusOK, "budgeting.html", d)
}