<template>
  <v-container>
    <RecipeDialogAddToShoppingList
      v-if="shoppingLists"
      v-model="state.shoppingListDialog"
      :recipes="weekRecipesWithScales"
      :shopping-lists="shoppingLists"
    />
    <v-menu
      v-model="state.picker"
      :close-on-content-click="false"
      transition="scale-transition"
      offset-y
      min-width="auto"
    >
      <template #activator="{ props }">
        <v-btn
          color="primary"
          class="mb-2"
          v-bind="props"
        >
          <v-icon start>
            {{ $globals.icons.calendar }}
          </v-icon>
          {{ $d(weekRange.start, "short") }} - {{ $d(weekRange.end, "short") }}
        </v-btn>
      </template>

      <v-card>
        <v-date-picker
          v-model="state.range"
          hide-header
          :multiple="'range'"
          :first-day-of-week="firstDayOfWeek"
          :local="$i18n.locale"
        />

        <v-card-text>
          <v-number-input
            v-model="numberOfDaysPast"
            :min="0"
            control-variant="stacked"
            inset
            :label="$t('meal-plan.numberOfDaysPast-label')"
            :hint="$t('meal-plan.numberOfDaysPast-hint')"
            persistent-hint
          />
        </v-card-text>

        <v-card-text>
          <v-number-input
            v-model="numberOfDays"
            :min="1"
            control-variant="stacked"
            inset
            :label="$t('meal-plan.numberOfDays-label')"
            :hint="$t('meal-plan.numberOfDays-hint')"
            persistent-hint
          />
        </v-card-text>
      </v-card>
    </v-menu>

    <div class="d-flex flex-wrap align-center justify-space-between mb-2">
      <v-tabs style="width: fit-content;">
        <v-tab :to="{ name: TABS.view, query: route.query }">
          {{ $t('meal-plan.meal-planner') }}
        </v-tab>
        <v-tab :to="{ name: TABS.edit, query: route.query }">
          {{ $t('general.edit') }}
        </v-tab>
      </v-tabs>
      <BaseButton
        v-if="route.name === TABS.view"
        color="info"
        :icon="$globals.icons.cartCheck"
        :text="$t('meal-plan.add-all-to-list')"
        :disabled="!hasRecipes"
        :loading="state.addAllLoading"
        class="ml-auto mr-4"
        @click="addAllToList"
      />
      <ButtonLink
        :icon="$globals.icons.calendar"
        :to="`/household/mealplan/settings`"
        :text="$t('general.settings')"
      />
    </div>

    <div>
      <NuxtPage
        :mealplans="mealsByDate"
        :actions="actions"
      />
    </div>

    <v-row />
  </v-container>
</template>

<script setup lang="ts">
import { isSameDay, addDays, parseISO, format, isValid } from "date-fns";
import RecipeDialogAddToShoppingList from "~/components/Domain/Recipe/RecipeDialogAddToShoppingList.vue";
import { useHouseholdSelf } from "~/composables/use-households";
import { useMealplans } from "~/composables/use-group-mealplan";
import { useUserMealPlanPreferences } from "~/composables/use-users/preferences";
import type { ShoppingListSummary } from "~/lib/api/types/household";
import { useUserApi } from "~/composables/api";

const TABS = {
  view: "household-mealplan-planner-view",
  edit: "household-mealplan-planner-edit",
};

const route = useRoute();
const router = useRouter();
const i18n = useI18n();
const api = useUserApi();
const { household } = useHouseholdSelf();

useSeoMeta({
  title: i18n.t("meal-plan.dinner-this-week"),
});

const mealPlanPreferences = useUserMealPlanPreferences();
const numberOfDaysPast = ref<number>(mealPlanPreferences.value.numberOfDaysPast || 0);
const numberOfDays = ref<number>(mealPlanPreferences.value.numberOfDays || 7);
watch(numberOfDaysPast, (val) => {
  mealPlanPreferences.value.numberOfDaysPast = Number(val);
});
watch(numberOfDays, (val) => {
  mealPlanPreferences.value.numberOfDays = Number(val);
});

// Force to /view if current route is /planner
if (route.path === "/household/mealplan/planner") {
  router.push({
    name: TABS.view,
    query: route.query,
  });
}

function safeParseISO(date: string, fallback: Date | undefined = undefined) {
  try {
    const parsed = parseISO(date);
    return isValid(parsed) ? parsed : fallback;
  }
  catch {
    return fallback;
  }
}

// Initialize dates from query parameters or defaults
const initialStartDate = safeParseISO(route.query.start as string, addDays(new Date(), adjustForToday(-numberOfDaysPast.value)));
const initialEndDate = safeParseISO(route.query.end as string, addDays(new Date(), adjustForToday(numberOfDays.value)));

const state = ref({
  range: [initialStartDate, initialEndDate] as [Date, Date],
  start: initialStartDate,
  picker: false,
  end: initialEndDate,
  shoppingListDialog: false,
  addAllLoading: false,
});

const shoppingLists = ref<ShoppingListSummary[]>();

const firstDayOfWeek = computed(() => {
  return household.value?.preferences?.firstDayOfWeek || 0;
});

const weekRange = computed(() => {
  const sorted = [...state.value.range].sort((a, b) => a.getTime() - b.getTime());

  const start = sorted[0];
  const end = sorted[sorted.length - 1];

  if (start && end) {
    return { start, end };
  }
  return {
    start: addDays(new Date(), adjustForToday(-numberOfDaysPast.value)),
    end: addDays(new Date(), adjustForToday(numberOfDays.value)),
  };
});

// Update query parameters when date range changes
watch(weekRange, (newRange) => {
  // Keep current route name and params, just update the query
  router.replace({
    name: route.name || TABS.view,
    params: route.params,
    query: {
      ...route.query,
      start: format(newRange.start, "yyyy-MM-dd"),
      end: format(newRange.end, "yyyy-MM-dd"),
    },
  });
}, { immediate: true });

const { mealplans, actions } = useMealplans(weekRange);

function filterMealByDate(date: Date) {
  if (!mealplans.value) return [];
  return mealplans.value.filter((meal) => {
    const mealDate = parseISO(meal.date);
    return isSameDay(mealDate, date);
  });
}

function adjustForToday(days: number) {
  // e.g. If the user wants 7 days, we subtract one to do "today + 6"
  // e.g. If the user wants 2 days in the past, we keep it the same to do "today - 2"
  return days > 0 ? days - 1 : days;
}

const days = computed(() => {
  const numDays
    = Math.floor((weekRange.value.end.getTime() - weekRange.value.start.getTime()) / (1000 * 60 * 60 * 24)) + 1;

  // Calculate absolute value
  if (numDays < 0) return [];

  return Array.from(Array(numDays).keys()).map(
    (i) => {
      const date = new Date(weekRange.value.start.getTime());
      date.setDate(date.getDate() + i);
      return date;
    },
  );
});

const mealsByDate = computed(() => {
  return days.value.map((day) => {
    return { date: day, meals: filterMealByDate(day) };
  });
});

const hasRecipes = computed(() => {
  return mealsByDate.value.some(day => day.meals.some(meal => meal.recipe));
});

const weekRecipesWithScales = computed(() => {
  const allRecipes: any[] = [];
  for (const day of mealsByDate.value) {
    for (const meal of day.meals) {
      if (meal.recipe) {
        allRecipes.push(meal.recipe);
      }
    }
  }
  return allRecipes.map(recipe => ({
    scale: 1,
    ...recipe,
  }));
});

async function getShoppingLists() {
  const { data } = await api.shopping.lists.getAll(1, -1, { orderBy: "name", orderDirection: "asc" });
  if (data) {
    shoppingLists.value = data.items as ShoppingListSummary[] ?? [];
  }
}

async function addAllToList() {
  state.value.addAllLoading = true;
  await getShoppingLists();
  state.value.shoppingListDialog = true;
  state.value.addAllLoading = false;
}
</script>

<style lang="css">
.left-color-border {
  border-left: 5px solid var(--v-primary-base) !important;
}

.bottom-color-border {
  border-bottom: 2px solid var(--v-primary-base) !important;
}
</style>
