import { HTMLString, markHTMLString } from "../escape.js";
import { serializeListValue } from "../util.js";
const voidElementNames = /^(area|base|br|col|command|embed|hr|img|input|keygen|link|meta|param|source|track|wbr)$/i;
const htmlBooleanAttributes = /^(allowfullscreen|async|autofocus|autoplay|controls|default|defer|disabled|disablepictureinpicture|disableremoteplayback|formnovalidate|hidden|loop|nomodule|novalidate|open|playsinline|readonly|required|reversed|scoped|seamless|itemscope)$/i;
const htmlEnumAttributes = /^(contenteditable|draggable|spellcheck|value)$/i;
const svgEnumAttributes = /^(autoReverse|externalResourcesRequired|focusable|preserveAlpha)$/i;
const STATIC_DIRECTIVES = /* @__PURE__ */ new Set(["set:html", "set:text"]);
const toIdent = (k) => k.trim().replace(/(?:(?!^)\b\w|\s+|[^\w]+)/g, (match, index) => {
  if (/[^\w]|\s/.test(match))
    return "";
  return index === 0 ? match : match.toUpperCase();
});
const toAttributeString = (value, shouldEscape = true) => shouldEscape ? String(value).replace(/&/g, "&").replace(/"/g, """) : value;
const kebab = (k) => k.toLowerCase() === k ? k : k.replace(/[A-Z]/g, (match) => `-${match.toLowerCase()}`);
const toStyleString = (obj) => Object.entries(obj).map(([k, v]) => {
  if (k[0] !== "-" && k[1] !== "-")
    return `${kebab(k)}:${v}`;
  if (kebab(k) !== k)
    return `${kebab(k)}:var(${k});${k}:${v}`;
  return `${k}:${v}`;
}).join(";");
function defineScriptVars(vars) {
  var _a;
  let output = "";
  for (const [key, value] of Object.entries(vars)) {
    output += `const ${toIdent(key)} = ${(_a = JSON.stringify(value)) == null ? void 0 : _a.replace(
      /<\/script>/g,
      "\\x3C/script>"
    )};
`;
  }
  return markHTMLString(output);
}
function formatList(values) {
  if (values.length === 1) {
    return values[0];
  }
  return `${values.slice(0, -1).join(", ")} or ${values[values.length - 1]}`;
}
function addAttribute(value, key, shouldEscape = true) {
  if (value == null) {
    return "";
  }
  if (value === false) {
    if (htmlEnumAttributes.test(key) || svgEnumAttributes.test(key)) {
      return markHTMLString(` ${key}="false"`);
    }
    return "";
  }
  if (STATIC_DIRECTIVES.has(key)) {
    console.warn(`[astro] The "${key}" directive cannot be applied dynamically at runtime. It will not be rendered as an attribute.

Make sure to use the static attribute syntax (\`${key}={value}\`) instead of the dynamic spread syntax (\`{...{ "${key}": value }}\`).`);
    return "";
  }
  if (key === "class:list") {
    const listValue = toAttributeString(serializeListValue(value), shouldEscape);
    if (listValue === "") {
      return "";
    }
    return markHTMLString(` ${key.slice(0, -5)}="${listValue}"`);
  }
  if (key === "style" && !(value instanceof HTMLString)) {
    if (Array.isArray(value) && value.length === 2) {
      return markHTMLString(
        ` ${key}="${toAttributeString(`${toStyleString(value[0])};${value[1]}`, shouldEscape)}"`
      );
    }
    if (typeof value === "object") {
      return markHTMLString(` ${key}="${toAttributeString(toStyleString(value), shouldEscape)}"`);
    }
  }
  if (key === "className") {
    return markHTMLString(` class="${toAttributeString(value, shouldEscape)}"`);
  }
  if (value === true && (key.startsWith("data-") || htmlBooleanAttributes.test(key))) {
    return markHTMLString(` ${key}`);
  } else {
    return markHTMLString(` ${key}="${toAttributeString(value, shouldEscape)}"`);
  }
}
function internalSpreadAttributes(values, shouldEscape = true) {
  let output = "";
  for (const [key, value] of Object.entries(values)) {
    output += addAttribute(value, key, shouldEscape);
  }
  return markHTMLString(output);
}
function renderElement(name, { props: _props, children = "" }, shouldEscape = true) {
  const { lang: _, "data-astro-id": astroId, "define:vars": defineVars, ...props } = _props;
  if (defineVars) {
    if (name === "style") {
      delete props["is:global"];
      delete props["is:scoped"];
    }
    if (name === "script") {
      delete props.hoist;
      children = defineScriptVars(defineVars) + "\n" + children;
    }
  }
  if ((children == null || children == "") && voidElementNames.test(name)) {
    return `<${name}${internalSpreadAttributes(props, shouldEscape)} />`;
  }
  return `<${name}${internalSpreadAttributes(props, shouldEscape)}>${children}</${name}>`;
}
const iteratorQueue = [];
function queueIteratorBuffers(iterators) {
  if (iteratorQueue.length === 0) {
    setTimeout(() => {
      iteratorQueue.forEach((its) => its.forEach((it) => !it.isStarted() && it.buffer()));
      iteratorQueue.length = 0;
    });
  }
  iteratorQueue.push(iterators);
}
function bufferIterators(iterators) {
  const eagerIterators = iterators.map((it) => new EagerAsyncIterableIterator(it));
  queueIteratorBuffers(eagerIterators);
  return eagerIterators;
}
class EagerAsyncIterableIterator {
  #iterable;
  #queue = new Queue();
  #error = void 0;
  #next;
  /**
   * Whether the proxy is running in buffering or pass-through mode
   */
  #isBuffering = false;
  #gen = void 0;
  #isStarted = false;
  constructor(iterable) {
    this.#iterable = iterable;
  }
  /**
   * Starts to eagerly fetch the inner iterator and cache the results.
   * Note: This might not be called after next() has been called once, e.g. the iterator is started
   */
  async buffer() {
    if (this.#gen) {
      throw new Error("Cannot not switch from non-buffer to buffer mode");
    }
    this.#isBuffering = true;
    this.#isStarted = true;
    this.#gen = this.#iterable[Symbol.asyncIterator]();
    let value = void 0;
    do {
      this.#next = this.#gen.next();
      try {
        value = await this.#next;
        this.#queue.push(value);
      } catch (e) {
        this.#error = e;
      }
    } while (value && !value.done);
  }
  async next() {
    if (this.#error) {
      throw this.#error;
    }
    if (!this.#isBuffering) {
      if (!this.#gen) {
        this.#isStarted = true;
        this.#gen = this.#iterable[Symbol.asyncIterator]();
      }
      return await this.#gen.next();
    }
    if (!this.#queue.isEmpty()) {
      return this.#queue.shift();
    }
    await this.#next;
    return this.#queue.shift();
  }
  isStarted() {
    return this.#isStarted;
  }
  [Symbol.asyncIterator]() {
    return this;
  }
}
class Queue {
  constructor() {
    this.head = void 0;
    this.tail = void 0;
  }
  push(item) {
    if (this.head === void 0) {
      this.head = { item };
      this.tail = this.head;
    } else {
      this.tail.next = { item };
      this.tail = this.tail.next;
    }
  }
  isEmpty() {
    return this.head === void 0;
  }
  shift() {
    var _a, _b;
    const val = (_a = this.head) == null ? void 0 : _a.item;
    this.head = (_b = this.head) == null ? void 0 : _b.next;
    return val;
  }
}
export {
  EagerAsyncIterableIterator,
  addAttribute,
  bufferIterators,
  defineScriptVars,
  formatList,
  internalSpreadAttributes,
  renderElement,
  toAttributeString,
  voidElementNames
};