package meals

import (
	"context"
	"fmt"
	"time"

	"git.bissendorf.co/bissendorf/unifood/m/v2/core/handler"
	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces/params"
	"git.bissendorf.co/bissendorf/unifood/m/v2/model/external/stwbremen"
	"git.bissendorf.co/bissendorf/unifood/m/v2/model/resources"
	"git.bissendorf.co/bissendorf/unifood/m/v2/util"
)

type MealsHandler struct {
	interfaces.ResourceHandler
	interfaces.GetHandler

	QueryClient interfaces.QueryClient[[]stwbremen.Meal]
}

func (h *MealsHandler) Get(ctx context.Context, name string, params params.Container) (*interfaces.ResourceList, error) {
	// Read parameters
	p, err := params.GetValue(handler.ParamDate)
	if err != nil {
		return nil, fmt.Errorf("unable to parse date parameter: %w", err)
	}
	date := p.(time.Time)

	location, err := params.GetValue(handler.ParamLocation)
	if err != nil {
		return nil, fmt.Errorf("unable to parse location parameter: %w", err)
	}

	// Build query
	query := fmt.Sprintf(
		`page('meals').children.filterBy('location', '%s').filterBy('date', '%s').filterBy('printonly', 0)`,
		location,
		date.Format(time.DateOnly),
	)

	// Run query
	meals, err := h.QueryClient.Get(ctx,
		query,
		`{"title":true,"ingredients":"page.ingredients.toObject","prices":"page.prices.toObject","location":true,"counter":true,"date":true,"mealadds":true,"mark":true,"frei3":true,"printonly":true,"kombicategory":true,"categories":"page.categories.split"}`,
		false,
	)
	if err != nil {
		return nil, fmt.Errorf("querying menu failed: %w", err)
	}

	// Return
	return &interfaces.ResourceList{
		ItemKind: resources.ResourceMeal,
		Items: util.Transform(*meals, func(i *stwbremen.Meal) interfaces.Resource {
			d, err := resources.MealFromDTO(*i)
			if err != nil {
				return &resources.Meal{}
			}

			return d
		}),
	}, nil

}

func (h *MealsHandler) GetParametersForVerb(verb interfaces.Verb) []params.Registration {
	return []params.Registration{
		{
			Name:        handler.ParamDate,
			ShortHand:   "d",
			Description: "Meal date",
			DefaultFunc: func() string { return time.Now().Format(time.DateOnly) },
			ParseFunc:   func(value string) (any, error) { return time.Parse(time.DateOnly, value) },
		},
		{
			Name:        handler.ParamLocation,
			ShortHand:   "l",
			Description: "Select a restaurant",
			DefaultFunc: func() string { return "330" },
			ParseFunc:   params.ParseString,
		},
	}
}