const { div, h2, p, section, button, form, a, span, textarea, br, input, h1 } = require("../server/node_modules/hyperaxe");
const { template, i18n } = require("./main_views");
const { config } = require("../server/SSB_server.js");
const { renderTextWithStyles } = require("../backend/renderTextWithStyles");
const opinionCategories = require("../backend/opinion_categories");
const { sanitizeHtml } = require('../backend/sanitizeHtml');

const FEED_TEXT_MIN = Number(config?.feed?.minLength ?? 1);
const FEED_TEXT_MAX = Number(config?.feed?.maxLength ?? 280);

const normalizeOptions = (opts) => {
  if (typeof opts === "string") return { filter: String(opts || "ALL").toUpperCase(), q: "", tag: "", msg: "" };
  if (!opts || typeof opts !== "object") return { filter: "ALL", q: "", tag: "", msg: "" };
  return {
    filter: String(opts.filter || "ALL").toUpperCase(),
    q: typeof opts.q === "string" ? opts.q : "",
    tag: typeof opts.tag === "string" ? opts.tag : "",
    msg: typeof opts.msg === "string" ? opts.msg : ""
  };
};

const formatDate = (feed) => {
  const ts = feed?.value?.timestamp || Date.parse(feed?.value?.content?.createdAt || "") || 0;
  return ts ? new Date(ts).toLocaleString() : "";
};

const extractTags = (text) => {
  const list = (String(text || "").match(/#[A-Za-z0-9_]{1,32}/g) || []).map((t) => t.slice(1).toLowerCase());
  return Array.from(new Set(list));
};

const rewriteHashtagLinks = (html) => {
    return String(html || '').replace(
        /href=(["'])\/hashtag\/([^"'?#\s<]+)\1/gi,
        (m, q, rawTag) => {
            let t = String(rawTag || '');
            try { t = decodeURIComponent(t); } catch {}
            t = t.replace(/[^A-Za-z0-9_]/g, '');
            const tag = t.toLowerCase();
            const query = encodeURIComponent(`#${tag}`);
            return `href=${q}/search?query=${query}${q}`;
        }
    );
};

const generateFilterButtons = (filters, currentFilter, action, extra = {}) => {
  const cur = String(currentFilter || "").toUpperCase();
  const hiddenInputs = (obj) =>
    Object.entries(obj)
      .filter(([, v]) => v !== undefined && v !== null && String(v).length > 0)
      .map(([k, v]) => input({ type: "hidden", name: k, value: String(v) }));

  return filters.map((mode) =>
    form(
      { method: "GET", action },
      input({ type: "hidden", name: "filter", value: mode }),
      ...hiddenInputs(extra),
      button({ type: "submit", class: cur === mode ? "filter-btn active" : "filter-btn" }, i18n[mode + "Button"] || mode)
    )
  );
};

const renderVotesSummary = (opinions = {}) => {
  const entries = Object.entries(opinions).filter(([, v]) => Number(v) > 0);
  if (!entries.length) return null;
  entries.sort((a, b) => Number(b[1]) - Number(a[1]) || String(a[0]).localeCompare(String(b[0])));
  return div(
    { class: "votes" },
    entries.map(([category, count]) => span({ class: "vote-category" }, `${category}: ${count}`))
  );
};

const renderFeedCard = (feed) => {
    const content = feed.value.content || {};
    const rawText = typeof content.text === "string" ? content.text : "";
    const safeText = rawText.trim();
    if (!safeText) return null;

    const voteEntries = Object.entries(content.opinions || {});
    const totalCount = voteEntries.reduce((sum, [, count]) => sum + (Number(count) || 0), 0);
    const createdAt = formatDate(feed);
    const me = config?.keys?.id;

    const alreadyRefeeded = Array.isArray(content.refeeds_inhabitants) && me ? content.refeeds_inhabitants.includes(me) : false;
    const alreadyVoted = Array.isArray(content.opinions_inhabitants) && me ? content.opinions_inhabitants.includes(me) : false;

    const authorId = content.author || feed.value.author || "";
    const refeedsNum = Number(content.refeeds || 0) || 0;
    const styledHtml = rewriteHashtagLinks(renderTextWithStyles(safeText));

    return div(
        { class: "feed-card" },
        div(
            { class: "feed-row" },
            div(
                { class: "refeed-column" },
                h1(String(refeedsNum)),
                form(
                    { method: "POST", action: `/feed/refeed/${encodeURIComponent(feed.key)}` },
                    button({ class: alreadyRefeeded ? "refeed-btn active" : "refeed-btn", type: "submit", disabled: !!alreadyRefeeded }, i18n.refeedButton)
                ),
                alreadyRefeeded ? p({ class: "muted" }, i18n.alreadyRefeeded) : null
            ),
            div(
                { class: "feed-main" },
                div({ class: "feed-text", innerHTML: sanitizeHtml(styledHtml) }),
                h2(
                    `${i18n.totalOpinions}: ${totalCount}`,
                    ...(() => {
                        const entries = voteEntries.filter(([, v]) => Number(v) > 0);
                        if (!entries.length) return [];
                        const maxVal = Math.max(...entries.map(([, v]) => Number(v)));
                        const dominant = entries.filter(([, v]) => Number(v) === maxVal).map(([k]) => i18n['vote' + k.charAt(0).toUpperCase() + k.slice(1)] || k);
                        return [
                            span({ style: 'margin:0 8px;opacity:0.5;' }, '|'),
                            span({ style: 'font-weight:700;' }, `${i18n.moreVoted || 'More Voted'}: ${dominant.join(' + ')}`)
                        ];
                    })()
                ),
                p(
                    { class: "card-footer" },
                    span({ class: "date-link" }, `${createdAt} ${i18n.performed} `),
                    a({ href: `/author/${encodeURIComponent(authorId)}`, class: "user-link" }, `${authorId}`),
                    content._textEdited ? span({ class: "edited-badge" }, ` · ${i18n.edited || "edited"}`) : null
                )
            )
        ),
        div(
            { class: "votes-wrapper" },
            renderVotesSummary(content.opinions || {}),
            div(
                { class: "voting-buttons" },
                opinionCategories.map((cat) =>
                    form(
                        { method: "POST", action: `/feed/opinions/${encodeURIComponent(feed.key)}/${cat}` },
                        button(
                            { class: alreadyVoted ? "vote-btn disabled" : "vote-btn", type: "submit", disabled: !!alreadyVoted },
                            `${i18n["vote" + cat.charAt(0).toUpperCase() + cat.slice(1)] || cat} [${content.opinions?.[cat] || 0}]`
                        )
                    )
                )
            ),
            alreadyVoted ? p({ class: "muted" }, i18n.alreadyVoted) : null
        )
    );
};

exports.feedView = (feeds, opts = "ALL") => {
  const { filter, q, tag, msg } = normalizeOptions(opts);

  const title =
    filter === "MINE"
      ? i18n.MINEButton
      : filter === "TODAY"
        ? i18n.TODAYButton
        : filter === "TOP"
          ? i18n.TOPButton
          : filter === "CREATE"
            ? i18n.createFeedTitle
            : tag
              ? `${i18n.filteredByTag || i18n.filteredByTagTitle || "Filtered by tag"}: #${tag}`
              : q
                ? `${i18n.searchTitle || "Search"}: “${q}”`
                : i18n.feedTitle;

  const header = div({ class: "tags-header" }, h2(title), p(i18n.FeedshareYourOpinions));
  const successBanner = msg === 'feedPublished'
    ? div({ class: 'feed-success-msg' }, p('✓ ' + (i18n.feedPublishedSuccess || 'Feed published successfully!')))
    : null;

  const extra = { q, tag };

  return template(
    title,
    section(
      header,
      successBanner,
      div(
        { class: "mode-buttons-row" },
        ...generateFilterButtons(["ALL", "MINE", "TODAY", "TOP"], filter, "/feed", extra),
        form({ method: "GET", action: "/feed/create" }, button({ type: "submit", class: "create-button filter-btn" }, i18n.createFeedTitle || "Create Feed"))
      ),
      div(
        { class: "feed-tools-row" },
        form(
          { method: "GET", action: "/feed", class: "feed-search-form" },
          input({ type: "hidden", name: "filter", value: filter }),
          tag ? input({ type: "hidden", name: "tag", value: tag }) : null,
          input({ type: "text", name: "q", value: q, placeholder: i18n.searchPlaceholder || "Search", class: "feed-search-input" }),
          button({ type: "submit", class: "filter-btn feed-search-btn" }, i18n.searchButton || "Search")
        )
      ),
      section(
        filter === "CREATE"
          ? form(
              { method: "POST", action: "/feed/create" },
              textarea({
                name: "text",
                placeholder: i18n.feedPlaceholder,
                required: true,
                minlength: String(FEED_TEXT_MIN),
                maxlength: String(FEED_TEXT_MAX),
                rows: 4,
                cols: 50
              }),
              br(),
              button({ type: "submit", class: "create-button" }, i18n.createFeedButton)
            )
          : feeds && feeds.length > 0
            ? div({ class: "feed-container" }, feeds.map((feed) => renderFeedCard(feed)).filter(Boolean))
            : div({ class: "no-results" }, p(i18n.noFeedsFound))
      )
    )
  );
};

exports.feedCreateView = (opts = {}) => {
  const { q, tag } = normalizeOptions(opts);

  return template(
    i18n.createFeedTitle,
    section(
      div({ class: "tags-header" }, h2(i18n.createFeedTitle), p(i18n.FeedshareYourOpinions)),
      div({ class: "mode-buttons-row" }, ...generateFilterButtons(["ALL", "MINE", "TODAY", "TOP"], "CREATE", "/feed", { q, tag })),
      form(
        { method: "POST", action: "/feed/create" },
        textarea({
          name: "text",
          required: true,
          minlength: String(FEED_TEXT_MIN),
          maxlength: String(FEED_TEXT_MAX),
          rows: 5,
          cols: 50,
          placeholder: i18n.feedPlaceholder
        }),
        br(),
        button({ type: "submit", class: "create-button" }, i18n.createFeedButton || "Send Feed!")
      )
    )
  );
};