"use strict";



//  P A C K A G E S

const dedent = require("dedent");
const fetch = require("make-fetch-happen").defaults({ cacheManager: "./cache" });
const fs = require("graceful-fs");
const html = require("choo-async/html");
const raw = require("nanohtml/raw");

//  V A R I A B L E

const apiFileLink = process.env.NODE_ENV === "development" ?
  "https://rawgit.com/lbryio/lbry/master/docs/api.json" :
  "https://cdn.rawgit.com/lbryio/lbry/5b3103e4/docs/api.json"
;

const apiScripts = "<script>" + fs.readFileSync("./views/partials/api-scripts.js", "utf-8") + "</script>";



//  E X P O R T

module.exports = exports = () => async () => parseApiFile().then(response => html`
  <div class="__slate">
    <aside class="api__toc">
      <div class="api__toc__search">
        <input class="api__toc__search__field" id="input-search" placeholder="Search" type="search"/>
        <div class="api__toc__search__clear" id="clear-search" title="Clear search query">&times;</div>
        <ul class="api__toc__search__results"></ul>
      </div>

      <ul class="api__toc__items" id="toc" role="navigation">${raw(createApiSidebar(response).join(""))}</ul>
    </aside>

    <section class="api__content" id="toc-content">${raw(createApiContent(response).join(""))}</section>
  </div>

  ${raw(apiScripts)}
`);



//  H E L P E R S

function createApiContent(apiDetails) {
  const apiContent = [];

  for (const apiDetail of apiDetails) {
    const apiDetailsReturns = JSON.parse(JSON.stringify(apiDetail.returns));

    apiContent.push(`
      <div class="api__content__body">
        <h2 id="${apiDetail.name}">${apiDetail.name}</h2>
        <p>${apiDetail.description}</p>

        ${apiDetail.arguments.length ? `<h3>Arguments</h3><ul class="api__content__body__arguments">${renderArguments(apiDetail.arguments).join("")}</ul>` : ""}

        <h3>Returns</h3>
        <pre><code>${dedent(apiDetailsReturns)}</code></pre>
      </div>

      <div class="api__content__example">
        <pre><code>// example(s) for ${apiDetail.name} to come later</code></pre>
      </div>
    `);
  }

  return apiContent;
}

function createApiSidebar(apiDetails) {
  const apiSidebar = [];

  for (const apiDetail of apiDetails) {
    apiSidebar.push(`
      <li class="api__toc__item">
        <a href="#${apiDetail.name}" title="Go to ${apiDetail.name} section">
          ${apiDetail.name}
        </a>
      </li>
    `);
  }

  return apiSidebar;
}

function parseApiFile() {
  return fetch(apiFileLink).then(() => fetch(apiFileLink, {
    cache: "no-cache" // forces a conditional request
  })).then(res => res.json().then(body => body)); // res.status 304 = cache validated
}

function renderArguments(args) {
  const argumentContent = [];

  for (const arg of args) {
    argumentContent.push(`
      <li class="api__content__body__argument">
        <div class="left">
          <strong>${arg.name}</strong><br/>
          ${arg.is_required === true ? "" : "<span>optional</span>" }<span>${arg.type}</span>
        </div>

        <div class="right">${arg.description.replace(/</g, "&lt;").replace(/>/g, "&gt;")}</div>
      </li>
    `);
  }

  return argumentContent;
}