import { __assign } from "tslib";
import { equal } from "@wry/equality";
import { DeepMerger } from "../utilities/index.js";
import { mergeIncrementalData } from "../utilities/index.js";
import { reobserveCacheFirst } from "./ObservableQuery.js";
import { isNonEmptyArray, graphQLResultHasError, canUseWeakMap, } from "../utilities/index.js";
import { NetworkStatus, isNetworkRequestInFlight } from "./networkStatus.js";
var destructiveMethodCounts = new (canUseWeakMap ? WeakMap : Map)();
function wrapDestructiveCacheMethod(cache, methodName) {
    var original = cache[methodName];
    if (typeof original === "function") {
        cache[methodName] = function () {
            destructiveMethodCounts.set(cache, 
            // The %1e15 allows the count to wrap around to 0 safely every
            // quadrillion evictions, so there's no risk of overflow. To be
            // clear, this is more of a pedantic principle than something
            // that matters in any conceivable practical scenario.
            (destructiveMethodCounts.get(cache) + 1) % 1e15);
            // @ts-expect-error this is just too generic to be typed correctly
            return original.apply(this, arguments);
        };
    }
}
function cancelNotifyTimeout(info) {
    if (info["notifyTimeout"]) {
        clearTimeout(info["notifyTimeout"]);
        info["notifyTimeout"] = void 0;
    }
}
// A QueryInfo object represents a single query managed by the
// QueryManager, which tracks all QueryInfo objects by queryId in its
// this.queries Map. QueryInfo objects store the latest results and errors
// for the given query, and are responsible for reporting those results to
// the corresponding ObservableQuery, via the QueryInfo.notify method.
// Results are reported asynchronously whenever setDiff marks the
// QueryInfo object as dirty, though a call to the QueryManager's
// broadcastQueries method may trigger the notification before it happens
// automatically. This class used to be a simple interface type without
// any field privacy or meaningful methods, which is why it still has so
// many public fields. The effort to lock down and simplify the QueryInfo
// interface is ongoing, and further improvements are welcome.
var QueryInfo = /** @class */ (function () {
    function QueryInfo(queryManager, queryId) {
        if (queryId === void 0) { queryId = queryManager.generateQueryId(); }
        this.queryId = queryId;
        this.listeners = new Set();
        this.document = null;
        this.lastRequestId = 1;
        this.stopped = false;
        this.dirty = false;
        this.observableQuery = null;
        var cache = (this.cache = queryManager.cache);
        // Track how often cache.evict is called, since we want eviction to
        // override the feud-stopping logic in the markResult method, by
        // causing shouldWrite to return true. Wrapping the cache.evict method
        // is a bit of a hack, but it saves us from having to make eviction
        // counting an official part of the ApolloCache API.
        if (!destructiveMethodCounts.has(cache)) {
            destructiveMethodCounts.set(cache, 0);
            wrapDestructiveCacheMethod(cache, "evict");
            wrapDestructiveCacheMethod(cache, "modify");
            wrapDestructiveCacheMethod(cache, "reset");
        }
    }
    QueryInfo.prototype.init = function (query) {
        var networkStatus = query.networkStatus || NetworkStatus.loading;
        if (this.variables &&
            this.networkStatus !== NetworkStatus.loading &&
            !equal(this.variables, query.variables)) {
            networkStatus = NetworkStatus.setVariables;
        }
        if (!equal(query.variables, this.variables)) {
            this.lastDiff = void 0;
        }
        Object.assign(this, {
            document: query.document,
            variables: query.variables,
            networkError: null,
            graphQLErrors: this.graphQLErrors || [],
            networkStatus: networkStatus,
        });
        if (query.observableQuery) {
            this.setObservableQuery(query.observableQuery);
        }
        if (query.lastRequestId) {
            this.lastRequestId = query.lastRequestId;
        }
        return this;
    };
    QueryInfo.prototype.reset = function () {
        cancelNotifyTimeout(this);
        this.dirty = false;
    };
    QueryInfo.prototype.getDiff = function () {
        var options = this.getDiffOptions();
        if (this.lastDiff && equal(options, this.lastDiff.options)) {
            return this.lastDiff.diff;
        }
        this.updateWatch(this.variables);
        var oq = this.observableQuery;
        if (oq && oq.options.fetchPolicy === "no-cache") {
            return { complete: false };
        }
        var diff = this.cache.diff(options);
        this.updateLastDiff(diff, options);
        return diff;
    };
    QueryInfo.prototype.updateLastDiff = function (diff, options) {
        this.lastDiff =
            diff ?
                {
                    diff: diff,
                    options: options || this.getDiffOptions(),
                }
                : void 0;
    };
    QueryInfo.prototype.getDiffOptions = function (variables) {
        var _a;
        if (variables === void 0) { variables = this.variables; }
        return {
            query: this.document,
            variables: variables,
            returnPartialData: true,
            optimistic: true,
            canonizeResults: (_a = this.observableQuery) === null || _a === void 0 ? void 0 : _a.options.canonizeResults,
        };
    };
    QueryInfo.prototype.setDiff = function (diff) {
        var _this = this;
        var oldDiff = this.lastDiff && this.lastDiff.diff;
        this.updateLastDiff(diff);
        if (!this.dirty && !equal(oldDiff && oldDiff.result, diff && diff.result)) {
            this.dirty = true;
            if (!this.notifyTimeout) {
                this.notifyTimeout = setTimeout(function () { return _this.notify(); }, 0);
            }
        }
    };
    QueryInfo.prototype.setObservableQuery = function (oq) {
        var _this = this;
        if (oq === this.observableQuery)
            return;
        if (this.oqListener) {
            this.listeners.delete(this.oqListener);
        }
        this.observableQuery = oq;
        if (oq) {
            oq["queryInfo"] = this;
            this.listeners.add((this.oqListener = function () {
                var diff = _this.getDiff();
                if (diff.fromOptimisticTransaction) {
                    // If this diff came from an optimistic transaction, deliver the
                    // current cache data to the ObservableQuery, but don't perform a
                    // reobservation, since oq.reobserveCacheFirst might make a network
                    // request, and we never want to trigger network requests in the
                    // middle of optimistic updates.
                    oq["observe"]();
                }
                else {
                    // Otherwise, make the ObservableQuery "reobserve" the latest data
                    // using a temporary fetch policy of "cache-first", so complete cache
                    // results have a chance to be delivered without triggering additional
                    // network requests, even when options.fetchPolicy is "network-only"
                    // or "cache-and-network". All other fetch policies are preserved by
                    // this method, and are handled by calling oq.reobserve(). If this
                    // reobservation is spurious, isDifferentFromLastResult still has a
                    // chance to catch it before delivery to ObservableQuery subscribers.
                    reobserveCacheFirst(oq);
                }
            }));
        }
        else {
            delete this.oqListener;
        }
    };
    QueryInfo.prototype.notify = function () {
        var _this = this;
        cancelNotifyTimeout(this);
        if (this.shouldNotify()) {
            this.listeners.forEach(function (listener) { return listener(_this); });
        }
        this.dirty = false;
    };
    QueryInfo.prototype.shouldNotify = function () {
        if (!this.dirty || !this.listeners.size) {
            return false;
        }
        if (isNetworkRequestInFlight(this.networkStatus) && this.observableQuery) {
            var fetchPolicy = this.observableQuery.options.fetchPolicy;
            if (fetchPolicy !== "cache-only" && fetchPolicy !== "cache-and-network") {
                return false;
            }
        }
        return true;
    };
    QueryInfo.prototype.stop = function () {
        if (!this.stopped) {
            this.stopped = true;
            // Cancel the pending notify timeout
            this.reset();
            this.cancel();
            // Revert back to the no-op version of cancel inherited from
            // QueryInfo.prototype.
            this.cancel = QueryInfo.prototype.cancel;
            var oq = this.observableQuery;
            if (oq)
                oq.stopPolling();
        }
    };
    // This method is a no-op by default, until/unless overridden by the
    // updateWatch method.
    QueryInfo.prototype.cancel = function () { };
    QueryInfo.prototype.updateWatch = function (variables) {
        var _this = this;
        if (variables === void 0) { variables = this.variables; }
        var oq = this.observableQuery;
        if (oq && oq.options.fetchPolicy === "no-cache") {
            return;
        }
        var watchOptions = __assign(__assign({}, this.getDiffOptions(variables)), { watcher: this, callback: function (diff) { return _this.setDiff(diff); } });
        if (!this.lastWatch || !equal(watchOptions, this.lastWatch)) {
            this.cancel();
            this.cancel = this.cache.watch((this.lastWatch = watchOptions));
        }
    };
    QueryInfo.prototype.resetLastWrite = function () {
        this.lastWrite = void 0;
    };
    QueryInfo.prototype.shouldWrite = function (result, variables) {
        var lastWrite = this.lastWrite;
        return !(lastWrite &&
            // If cache.evict has been called since the last time we wrote this
            // data into the cache, there's a chance writing this result into
            // the cache will repair what was evicted.
            lastWrite.dmCount === destructiveMethodCounts.get(this.cache) &&
            equal(variables, lastWrite.variables) &&
            equal(result.data, lastWrite.result.data));
    };
    QueryInfo.prototype.markResult = function (result, document, options, cacheWriteBehavior) {
        var _this = this;
        result = __assign({}, result);
        var merger = new DeepMerger();
        var graphQLErrors = isNonEmptyArray(result.errors) ? result.errors.slice(0) : [];
        // Cancel the pending notify timeout (if it exists) to prevent extraneous network
        // requests. To allow future notify timeouts, diff and dirty are reset as well.
        this.reset();
        if ("incremental" in result && isNonEmptyArray(result.incremental)) {
            var mergedData = mergeIncrementalData(this.getDiff().result, result);
            result.data = mergedData;
            // Detect the first chunk of a deferred query and merge it with existing
            // cache data. This ensures a `cache-first` fetch policy that returns
            // partial cache data or a `cache-and-network` fetch policy that already
            // has full data in the cache does not complain when trying to merge the
            // initial deferred server data with existing cache data.
        }
        else if ("hasNext" in result && result.hasNext) {
            var diff = this.getDiff();
            result.data = merger.merge(diff.result, result.data);
        }
        this.graphQLErrors = graphQLErrors;
        if (options.fetchPolicy === "no-cache") {
            this.updateLastDiff({ result: result.data, complete: true }, this.getDiffOptions(options.variables));
        }
        else if (cacheWriteBehavior !== 0 /* CacheWriteBehavior.FORBID */) {
            if (shouldWriteResult(result, options.errorPolicy)) {
                // Using a transaction here so we have a chance to read the result
                // back from the cache before the watch callback fires as a result
                // of writeQuery, so we can store the new diff quietly and ignore
                // it when we receive it redundantly from the watch callback.
                this.cache.performTransaction(function (cache) {
                    if (_this.shouldWrite(result, options.variables)) {
                        cache.writeQuery({
                            query: document,
                            data: result.data,
                            variables: options.variables,
                            overwrite: cacheWriteBehavior === 1 /* CacheWriteBehavior.OVERWRITE */,
                        });
                        _this.lastWrite = {
                            // Make a shallow defensive copy of the result object, in case we
                            // later later modify result.data in place, since we don't want
                            // that mutation affecting the saved lastWrite.result.data.
                            result: __assign({}, result),
                            variables: options.variables,
                            dmCount: destructiveMethodCounts.get(_this.cache),
                        };
                    }
                    else {
                        // If result is the same as the last result we received from
                        // the network (and the variables match too), avoid writing
                        // result into the cache again. The wisdom of skipping this
                        // cache write is far from obvious, since any cache write
                        // could be the one that puts the cache back into a desired
                        // state, fixing corruption or missing data. However, if we
                        // always write every network result into the cache, we enable
                        // feuds between queries competing to update the same data in
                        // incompatible ways, which can lead to an endless cycle of
                        // cache broadcasts and useless network requests. As with any
                        // feud, eventually one side must step back from the brink,
                        // letting the other side(s) have the last word(s). There may
                        // be other points where we could break this cycle, such as
                        // silencing the broadcast for cache.writeQuery (not a good
                        // idea, since it just delays the feud a bit) or somehow
                        // avoiding the network request that just happened (also bad,
                        // because the server could return useful new data). All
                        // options considered, skipping this cache write seems to be
                        // the least damaging place to break the cycle, because it
                        // reflects the intuition that we recently wrote this exact
                        // result into the cache, so the cache *should* already/still
                        // contain this data. If some other query has clobbered that
                        // data in the meantime, that's too bad, but there will be no
                        // winners if every query blindly reverts to its own version
                        // of the data. This approach also gives the network a chance
                        // to return new data, which will be written into the cache as
                        // usual, notifying only those queries that are directly
                        // affected by the cache updates, as usual. In the future, an
                        // even more sophisticated cache could perhaps prevent or
                        // mitigate the clobbering somehow, but that would make this
                        // particular cache write even less important, and thus
                        // skipping it would be even safer than it is today.
                        if (_this.lastDiff && _this.lastDiff.diff.complete) {
                            // Reuse data from the last good (complete) diff that we
                            // received, when possible.
                            result.data = _this.lastDiff.diff.result;
                            return;
                        }
                        // If the previous this.diff was incomplete, fall through to
                        // re-reading the latest data with cache.diff, below.
                    }
                    var diffOptions = _this.getDiffOptions(options.variables);
                    var diff = cache.diff(diffOptions);
                    // In case the QueryManager stops this QueryInfo before its
                    // results are delivered, it's important to avoid restarting the
                    // cache watch when markResult is called. We also avoid updating
                    // the watch if we are writing a result that doesn't match the current
                    // variables to avoid race conditions from broadcasting the wrong
                    // result.
                    if (!_this.stopped && equal(_this.variables, options.variables)) {
                        // Any time we're about to update this.diff, we need to make
                        // sure we've started watching the cache.
                        _this.updateWatch(options.variables);
                    }
                    // If we're allowed to write to the cache, update result.data to be
                    // the result as re-read from the cache, rather than the raw network
                    // result. Set without setDiff to avoid triggering a notify call,
                    // since we have other ways of notifying for this result.
                    _this.updateLastDiff(diff, diffOptions);
                    result.data = diff.result;
                });
            }
            else {
                this.lastWrite = void 0;
            }
        }
        return result;
    };
    QueryInfo.prototype.markReady = function () {
        this.networkError = null;
        return (this.networkStatus = NetworkStatus.ready);
    };
    QueryInfo.prototype.markError = function (error) {
        this.networkStatus = NetworkStatus.error;
        this.lastWrite = void 0;
        this.reset();
        if (error.graphQLErrors) {
            this.graphQLErrors = error.graphQLErrors;
        }
        if (error.networkError) {
            this.networkError = error.networkError;
        }
        return error;
    };
    return QueryInfo;
}());
export { QueryInfo };
export function shouldWriteResult(result, errorPolicy) {
    if (errorPolicy === void 0) { errorPolicy = "none"; }
    var ignoreErrors = errorPolicy === "ignore" || errorPolicy === "all";
    var writeWithErrors = !graphQLResultHasError(result);
    if (!writeWithErrors && ignoreErrors && result.data) {
        writeWithErrors = true;
    }
    return writeWithErrors;
}
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