// @ts-check
"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
Object.defineProperty(exports, "createWatcher", {
    enumerable: true,
    get: ()=>createWatcher
});
const _chokidar = /*#__PURE__*/ _interopRequireDefault(require("chokidar"));
const _fs = /*#__PURE__*/ _interopRequireDefault(require("fs"));
const _micromatch = /*#__PURE__*/ _interopRequireDefault(require("micromatch"));
const _normalizePath = /*#__PURE__*/ _interopRequireDefault(require("normalize-path"));
const _path = /*#__PURE__*/ _interopRequireDefault(require("path"));
const _utilsJs = require("./utils.js");
function _interopRequireDefault(obj) {
    return obj && obj.__esModule ? obj : {
        default: obj
    };
}
function createWatcher(args, { state , rebuild  }) {
    let shouldPoll = args["--poll"];
    let shouldCoalesceWriteEvents = shouldPoll || process.platform === "win32";
    // Polling interval in milliseconds
    // Used only when polling or coalescing add/change events on Windows
    let pollInterval = 10;
    let watcher = _chokidar.default.watch([], {
        // Force checking for atomic writes in all situations
        // This causes chokidar to wait up to 100ms for a file to re-added after it's been unlinked
        // This only works when watching directories though
        atomic: true,
        usePolling: shouldPoll,
        interval: shouldPoll ? pollInterval : undefined,
        ignoreInitial: true,
        awaitWriteFinish: shouldCoalesceWriteEvents ? {
            stabilityThreshold: 50,
            pollInterval: pollInterval
        } : false
    });
    let chain = Promise.resolve();
    let pendingRebuilds = new Set();
    let changedContent = [];
    /**
   *
   * @param {*} file
   * @param {(() => Promise<string>) | null} content
   */ function recordChangedFile(file, content = null) {
        file = _path.default.resolve(file);
        content = content !== null && content !== void 0 ? content : async ()=>await _fs.default.promises.readFile(file, "utf8");
        changedContent.push({
            file,
            content,
            extension: _path.default.extname(file).slice(1)
        });
        chain = chain.then(()=>rebuild(changedContent.splice(0)));
        return chain;
    }
    watcher.on("change", (file)=>recordChangedFile(file));
    watcher.on("add", (file)=>recordChangedFile(file));
    // Restore watching any files that are "removed"
    // This can happen when a file is pseudo-atomically replaced (a copy is created, overwritten, the old one is unlinked, and the new one is renamed)
    // TODO: An an optimization we should allow removal when the config changes
    watcher.on("unlink", (file)=>{
        file = (0, _normalizePath.default)(file);
        // Only re-add the file if it's not covered by a dynamic pattern
        if (!_micromatch.default.some([
            file
        ], state.contentPatterns.dynamic)) {
            watcher.add(file);
        }
    });
    // Some applications such as Visual Studio (but not VS Code)
    // will only fire a rename event for atomic writes and not a change event
    // This is very likely a chokidar bug but it's one we need to work around
    // We treat this as a change event and rebuild the CSS
    watcher.on("raw", (evt, filePath, meta)=>{
        if (evt !== "rename") {
            return;
        }
        let watchedPath = meta.watchedPath;
        // Watched path might be the file itself
        // Or the directory it is in
        filePath = watchedPath.endsWith(filePath) ? watchedPath : _path.default.join(watchedPath, filePath);
        // Skip this event since the files it is for does not match any of the registered content globs
        if (!_micromatch.default.some([
            filePath
        ], state.contentPatterns.all)) {
            return;
        }
        // Skip since we've already queued a rebuild for this file that hasn't happened yet
        if (pendingRebuilds.has(filePath)) {
            return;
        }
        pendingRebuilds.add(filePath);
        chain = chain.then(async ()=>{
            let content;
            try {
                content = await (0, _utilsJs.readFileWithRetries)(_path.default.resolve(filePath));
            } finally{
                pendingRebuilds.delete(filePath);
            }
            return recordChangedFile(filePath, ()=>content);
        });
    });
    return {
        fswatcher: watcher,
        refreshWatchedFiles () {
            watcher.add(Array.from(state.contextDependencies));
            watcher.add(Array.from(state.configDependencies));
            watcher.add(state.contentPatterns.all);
        }
    };
}