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import { is_promise } from './utils.js';
import { check_outros, group_outros, transition_in, transition_out } from './transitions.js';
import { flush } from './scheduler.js';
import { get_current_component, set_current_component } from './lifecycle.js';
/**
* @template T
* @param {Promise<T>} promise
* @param {import('./private.js').PromiseInfo<T>} info
* @returns {boolean}
*/
export function handle_promise(promise, info) {
const token = (info.token = {});
/**
* @param {import('./private.js').FragmentFactory} type
* @param {0 | 1 | 2} index
* @param {number} [key]
* @param {any} [value]
* @returns {void}
*/
function update(type, index, key, value) {
if (info.token !== token) return;
info.resolved = value;
let child_ctx = info.ctx;
if (key !== undefined) {
child_ctx = child_ctx.slice();
child_ctx[key] = value;
}
const block = type && (info.current = type)(child_ctx);
let needs_flush = false;
if (info.block) {
if (info.blocks) {
info.blocks.forEach((block, i) => {
if (i !== index && block) {
group_outros();
transition_out(block, 1, 1, () => {
if (info.blocks[i] === block) {
info.blocks[i] = null;
}
});
check_outros();
}
});
} else {
info.block.d(1);
}
block.c();
transition_in(block, 1);
block.m(info.mount(), info.anchor);
needs_flush = true;
}
info.block = block;
if (info.blocks) info.blocks[index] = block;
if (needs_flush) {
flush();
}
}
if (is_promise(promise)) {
const current_component = get_current_component();
promise.then(
(value) => {
set_current_component(current_component);
update(info.then, 1, info.value, value);
set_current_component(null);
},
(error) => {
set_current_component(current_component);
update(info.catch, 2, info.error, error);
set_current_component(null);
if (!info.hasCatch) {
throw error;
}
}
);
// if we previously had a then/catch block, destroy it
if (info.current !== info.pending) {
update(info.pending, 0);
return true;
}
} else {
if (info.current !== info.then) {
update(info.then, 1, info.value, promise);
return true;
}
info.resolved = /** @type {T} */ (promise);
}
}
/** @returns {void} */
export function update_await_block_branch(info, ctx, dirty) {
const child_ctx = ctx.slice();
const { resolved } = info;
if (info.current === info.then) {
child_ctx[info.value] = resolved;
}
if (info.current === info.catch) {
child_ctx[info.error] = resolved;
}
info.block.p(child_ctx, dirty);
}
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