// === API FUNCTIONS ===

async function fetchTags() {
    try {
        const r = await fetch(`${API}/${state.base}?order=ref.asc`);
        state.tags = r.ok ? await r.json() : [];
    } catch(e) {
        state.tags = [];
    }
}

async function fetchGroups() {
    try {
        const r = await fetch(`${API}/api_groups`);
        state.groups = r.ok ? await r.json() : [];
    } catch(e) {
        state.groups = [];
    }
}

async function fetchLibraries() {
    try {
        const r = await fetch(`${API}/api_library_list`);
        state.libraries = r.ok ? await r.json() : [];
    } catch(e) {
        state.libraries = [];
    }
}

async function fetchGraphEdges() {
    try {
        const r = await fetch(`${API}/graph_hst`);
        state.graphEdges = r.ok ? await r.json() : [];
    } catch(e) {
        state.graphEdges = [];
    }
}

async function fetchTreeEdges() {
    try {
        const r = await fetch(`${API}/tree_hst`);
        state.treeEdges = r.ok ? await r.json() : [];
    } catch(e) {
        state.treeEdges = [];
    }
}

async function fetchLibraryMembers(mrf) {
    try {
        const r = await fetch(`${API}/library_hst?mrf_library=eq.${mrf}`);
        return r.ok ? (await r.json()).map(d => d.mrf_tag) : [];
    } catch(e) {
        return [];
    }
}

async function fetchChildren(mrf) {
    try {
        const r = await fetch(`${API}/rpc/api_children`, {
            method: "POST",
            headers: {"Content-Type": "application/json"},
            body: JSON.stringify({parent_mrf: mrf})
        });
        return r.ok ? await r.json() : [];
    } catch(e) {
        return [];
    }
}

async function fetchRelated(mrf) {
    try {
        const r = await fetch(`${API}/rpc/api_related`, {
            method: "POST",
            headers: {"Content-Type": "application/json"},
            body: JSON.stringify({tag_mrf: mrf})
        });
        return r.ok ? await r.json() : [];
    } catch(e) {
        return [];
    }
}