import { computed, ref } from 'vue';
import { defineStore } from 'pinia';
import { useAuthStore } from '@/features/auth/stores/authStore.js';
import { useWorkspaceStore } from '@/features/workspaces/stores/workspaceStore.js';
import { useClient } from '@/plugins/api.js';

export const useCalendarIntegrationsStore = defineStore('calendar-integrations', () => {
    const authStore = useAuthStore();
    const workspaceStore = useWorkspaceStore();
    const client = useClient();

    const sources = ref([]);
    const events = ref([]);
    const catalogEntries = ref([]);
    const hiddenSourceIds = ref(new Set());
    const isLoadingSources = ref(false);
    const isLoadingEvents = ref(false);
    const isLoadingCatalog = ref(false);
    const isCreatingSource = ref(false);
    const error = ref(null);

    const visibleSourceIds = computed(() =>
        new Set(sources.value
            .filter(source => source.isEnabled && !hiddenSourceIds.value.has(source.id))
            .map(source => source.id))
    );

    const visibleEvents = computed(() =>
        events.value.filter(event => visibleSourceIds.value.has(event.calendarSourceId))
    );

    function sourceById(sourceId) {
        return sources.value.find(source => source.id === sourceId) ?? null;
    }

    async function fetchSources(workspaceId = workspaceStore.activeWorkspaceId) {
        if (!authStore.isAuthenticated) {
            sources.value = [];
            error.value = null;
            return;
        }

        isLoadingSources.value = true;
        error.value = null;

        try {
            const response = await client.get('/api/calendar-integrations/sources', {
                params: {
                    workspaceId: workspaceId ?? undefined,
                },
            });
            sources.value = response.data ?? [];
        } catch (fetchError) {
            console.error('Failed to fetch calendar sources:', fetchError);
            sources.value = [];
            error.value = 'Failed to load calendar sources.';
        } finally {
            isLoadingSources.value = false;
        }
    }

    async function fetchEvents({ workspaceId = workspaceStore.activeWorkspaceId, startDate, endDate } = {}) {
        if (!authStore.isAuthenticated) {
            events.value = [];
            error.value = null;
            return;
        }

        isLoadingEvents.value = true;

        try {
            const response = await client.get('/api/calendar-integrations/events', {
                params: {
                    workspaceId: workspaceId ?? undefined,
                    startDate,
                    endDate,
                },
            });
            events.value = response.data ?? [];
        } catch (fetchError) {
            console.error('Failed to fetch calendar events:', fetchError);
            events.value = [];
            error.value = 'Failed to load calendar events.';
        } finally {
            isLoadingEvents.value = false;
        }
    }

    async function searchCatalog(filters = {}) {
        if (!authStore.isAuthenticated) {
            catalogEntries.value = [];
            return;
        }

        isLoadingCatalog.value = true;

        try {
            const response = await client.get('/api/calendar-integrations/catalog', {
                params: filters,
            });
            catalogEntries.value = response.data ?? [];
        } catch (fetchError) {
            console.error('Failed to search calendar catalog:', fetchError);
            catalogEntries.value = [];
            error.value = 'Failed to load calendar catalog.';
        } finally {
            isLoadingCatalog.value = false;
        }
    }

    async function createSource(payload) {
        isCreatingSource.value = true;
        error.value = null;

        try {
            const response = await client.post('/api/calendar-integrations/sources', payload);
            if (response.data) {
                sources.value = [...sources.value, response.data]
                    .sort((left, right) => left.displayTitle.localeCompare(right.displayTitle));
            }
            return response.data;
        } catch (createError) {
            console.error('Failed to create calendar source:', createError);
            error.value = 'Failed to add calendar source.';
            throw createError;
        } finally {
            isCreatingSource.value = false;
        }
    }

    async function updateSource(sourceId, payload) {
        if (!sourceId) {
            return null;
        }

        error.value = null;

        try {
            const response = await client.put(`/api/calendar-integrations/sources/${sourceId}`, payload);
            const updatedSource = response.data;
            if (updatedSource) {
                sources.value = sources.value.map(source =>
                    source.id === updatedSource.id ? updatedSource : source
                );
            }
            return updatedSource;
        } catch (updateError) {
            console.error('Failed to update calendar source:', updateError);
            error.value = 'Failed to update calendar source.';
            throw updateError;
        }
    }

    async function refreshSource(sourceId) {
        if (!sourceId) {
            return null;
        }

        try {
            const response = await client.post(`/api/calendar-integrations/sources/${sourceId}/refresh`);
            const refreshedSource = response.data;
            if (refreshedSource) {
                sources.value = sources.value.map(source =>
                    source.id === refreshedSource.id ? refreshedSource : source
                );
            }
            return refreshedSource;
        } catch (refreshError) {
            console.error('Failed to refresh calendar source:', refreshError);
            error.value = 'Failed to refresh calendar source.';
            throw refreshError;
        }
    }

    function toggleSourceVisibility(sourceId) {
        const nextHiddenIds = new Set(hiddenSourceIds.value);
        if (nextHiddenIds.has(sourceId)) {
            nextHiddenIds.delete(sourceId);
        } else {
            nextHiddenIds.add(sourceId);
        }
        hiddenSourceIds.value = nextHiddenIds;
    }

    return {
        sources,
        events,
        catalogEntries,
        hiddenSourceIds,
        visibleSourceIds,
        visibleEvents,
        isLoadingSources,
        isLoadingEvents,
        isLoadingCatalog,
        isCreatingSource,
        error,
        sourceById,
        fetchSources,
        fetchEvents,
        searchCatalog,
        createSource,
        updateSource,
        refreshSource,
        toggleSourceVisibility,
    };
});