// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
/*!
 * Adapted directly from negotiator at https://github.com/jshttp/negotiator/
 * which is licensed as follows:
 *
 * (The MIT License)
 *
 * Copyright (c) 2012-2014 Federico Romero
 * Copyright (c) 2012-2014 Isaac Z. Schlueter
 * Copyright (c) 2014-2015 Douglas Christopher Wilson
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * 'Software'), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */ import { compareSpecs, isQuality } from "./common.ts";
const simpleMediaTypeRegExp = /^\s*([^\s\/;]+)\/([^;\s]+)\s*(?:;(.*))?$/;
function splitKeyValuePair(str) {
  const [key, value] = str.split("=");
  return [
    key.toLowerCase(),
    value
  ];
}
function parseMediaType(str, i) {
  const match = simpleMediaTypeRegExp.exec(str);
  if (!match) {
    return;
  }
  const [, type, subtype, parameters] = match;
  if (!type || !subtype) {
    return;
  }
  const params = Object.create(null);
  let q = 1;
  if (parameters) {
    const kvps = parameters.split(";").map((p)=>p.trim()).map(splitKeyValuePair);
    for (const [key, val] of kvps){
      const value = val && val[0] === `"` && val[val.length - 1] === `"` ? val.slice(1, val.length - 1) : val;
      if (key === "q" && value) {
        q = parseFloat(value);
        break;
      }
      params[key] = value;
    }
  }
  return {
    type,
    subtype,
    params,
    q,
    i
  };
}
function parseAccept(accept) {
  const accepts = accept.split(",").map((p)=>p.trim());
  const mediaTypes = [];
  for (const [index, accept] of accepts.entries()){
    const mediaType = parseMediaType(accept.trim(), index);
    if (mediaType) {
      mediaTypes.push(mediaType);
    }
  }
  return mediaTypes;
}
function getFullType(spec) {
  return `${spec.type}/${spec.subtype}`;
}
function specify(type, spec, index) {
  const p = parseMediaType(type, index);
  if (!p) {
    return;
  }
  let s = 0;
  if (spec.type.toLowerCase() === p.type.toLowerCase()) {
    s |= 4;
  } else if (spec.type !== "*") {
    return;
  }
  if (spec.subtype.toLowerCase() === p.subtype.toLowerCase()) {
    s |= 2;
  } else if (spec.subtype !== "*") {
    return;
  }
  const keys = Object.keys(spec.params);
  if (keys.length) {
    if (keys.every((key)=>(spec.params[key] || "").toLowerCase() === (p.params[key] || "").toLowerCase())) {
      s |= 1;
    } else {
      return;
    }
  }
  return {
    i: index,
    o: spec.o,
    q: spec.q,
    s
  };
}
function getMediaTypePriority(type, accepted, index) {
  let priority = {
    o: -1,
    q: 0,
    s: 0,
    i: index
  };
  for (const accepts of accepted){
    const spec = specify(type, accepts, index);
    if (spec && ((priority.s || 0) - (spec.s || 0) || (priority.q || 0) - (spec.q || 0) || (priority.o || 0) - (spec.o || 0)) < 0) {
      priority = spec;
    }
  }
  return priority;
}
export function preferredMediaTypes(accept, provided) {
  const accepts = parseAccept(accept === undefined ? "*/*" : accept || "");
  if (!provided) {
    return accepts.filter(isQuality).sort(compareSpecs).map(getFullType);
  }
  const priorities = provided.map((type, index)=>{
    return getMediaTypePriority(type, accepts, index);
  });
  return priorities.filter(isQuality).sort(compareSpecs).map((priority)=>provided[priorities.indexOf(priority)]);
}
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