{{define "title"}}{{ tr "Import post" }} · {{ tr "Volumen admin" }}{{end}}
{{define "content"}}
<div class="page-head">
  <div class="page-head__text">
    <h1>{{ tr "Import post" }}</h1>
    <p class="page-head__lede">{{ tr "Bring a post written anywhere: a Markdown file with optional TOML frontmatter." }}</p>
  </div>
  <div class="page-head__actions">
    <a class="btn btn--ghost" href="/admin/">{{ tr "Cancel" }}</a>
  </div>
</div>

{{if .Error}}
  <div class="status status--error" role="alert">
    <svg aria-hidden="true"><use href="/admin/assets/graphis.svg#alert-circle"></use></svg>
    <div>{{ .Error }}</div>
  </div>
{{end}}

<form method="post" action="/admin/posts/import" enctype="multipart/form-data" id="import-form" class="stack">
  <input type="hidden" name="_csrf" value="{{ .CSRFToken }}">

  <label class="dropzone" id="dropzone">
    <input id="import-file" type="file" name="file" accept=".md,text/markdown" class="dropzone__input">
    <span class="dropzone__icon" aria-hidden="true">
      <svg><use href="/admin/assets/graphis.svg#upload"></use></svg>
    </span>
    <span class="dropzone__title">{{ tr "Drop your post here" }}</span>
    <span class="dropzone__sub">{{ tr "or click to browse" }} · .md · UTF-8</span>
    <span class="dropzone__hint">markdown&nbsp;+&nbsp;toml frontmatter&nbsp;(&nbsp;+++&nbsp;)</span>
    <span class="dropzone__error" id="dz-error" role="alert" hidden></span>
  </label>

  <div class="file-row" id="dz-file" hidden>
    <span class="file-row__ok" aria-hidden="true">
      <svg><use href="/admin/assets/graphis.svg#check"></use></svg>
    </span>
    <span class="file-row__info">
      <span class="file-row__name" id="dz-name"></span>
      <span class="file-row__meta" id="dz-meta"></span>
    </span>
    <button type="button" class="btn btn--ghost btn--sm" id="dz-clear">{{ tr "Remove" }}</button>
  </div>

  <div class="card" id="dz-preview" hidden>
    <div class="card__head">
      <h2 class="mono">{{ tr "frontmatter" }}</h2>
    </div>
    <dl class="kv" id="dz-kv"></dl>
    <p class="field__hint" id="dz-note" hidden>
      {{ tr "No frontmatter found; the slug will be derived from the file name." }}
    </p>
  </div>

  <button type="submit" class="btn btn--primary" id="dz-submit" disabled>
    {{ tr "Import post" }}
    <svg aria-hidden="true"><use href="/admin/assets/graphis.svg#arrow-right"></use></svg>
  </button>
</form>

<script nonce="{{ .CSPNonce }}">
  (() => {
    const zone = document.getElementById("dropzone");
    const input = document.getElementById("import-file");
    const fileRow = document.getElementById("dz-file");
    const nameEl = document.getElementById("dz-name");
    const metaEl = document.getElementById("dz-meta");
    const preview = document.getElementById("dz-preview");
    const kvEl = document.getElementById("dz-kv");
    const noteEl = document.getElementById("dz-note");
    const errorEl = document.getElementById("dz-error");
    const clearBtn = document.getElementById("dz-clear");
    const submitBtn = document.getElementById("dz-submit");
    let depth = 0;

    /* Keep the browser from navigating away when a file misses the zone. */
    ["dragover", "drop"].forEach((evt) =>
      window.addEventListener(evt, (event) => event.preventDefault()));
    window.addEventListener("dragenter", () => {
      depth += 1;
      zone.classList.add("is-over");
    });
    window.addEventListener("dragleave", () => {
      depth = Math.max(0, depth - 1);
      if (depth === 0) zone.classList.remove("is-over");
    });
    zone.addEventListener("drop", (event) => {
      event.preventDefault();
      event.stopPropagation();
      depth = 0;
      zone.classList.remove("is-over");
      const files = Array.from(event.dataTransfer?.files || []);
      if (files.length) acceptFile(files[0]);
    });
    input.addEventListener("change", () => {
      if (input.files?.length) acceptFile(input.files[0]);
    });

    clearBtn.addEventListener("click", () => {
      input.value = "";
      zone.classList.remove("has-file");
      fileRow.hidden = true;
      preview.hidden = true;
      errorEl.hidden = true;
      submitBtn.disabled = true;
    });

    function acceptFile(file) {
      errorEl.hidden = true;
      zone.classList.remove("is-rejected");
      if (!/\.md$/i.test(file.name)) {
        zone.classList.add("is-rejected");
        errorEl.textContent = window.__f("import.rejected", file.name);
        errorEl.hidden = false;
        return;
      }
      /* Re-attach a dropped file so the real form carries it. */
      if (!input.files?.length || input.files[0] !== file) {
        const transfer = new DataTransfer();
        transfer.items.add(file);
        input.files = transfer.files;
      }
      zone.classList.add("has-file");
      nameEl.textContent = file.name;
      metaEl.textContent = formatSize(file.size);
      fileRow.hidden = false;
      submitBtn.disabled = false;
      readPreview(file);
    }

    async function readPreview(file) {
      const text = await file.text();
      const fm = parseFrontmatter(text);
      const body = text.replace(/^\+\+\+[\s\S]*?\+\+\+\r?\n?/, "");
      const words = (body.match(/\S+/g) || []).length;
      metaEl.textContent += " · " + window.__n("editor.words", words);

      kvEl.replaceChildren();
      let shown = 0;
      for (const key of ["title", "slug", "tags", "date", "lang"]) {
        if (!fm || !(key in fm)) continue;
        const dt = document.createElement("dt");
        dt.textContent = key;
        const dd = document.createElement("dd");
        dd.textContent = formatValue(fm[key]);
        kvEl.append(dt, dd);
        shown += 1;
      }
      noteEl.hidden = shown > 0;
      preview.hidden = false;
    }

    /* The preview shows values the way they read, not the way TOML quotes
       them: surrounding quotes go, and an array becomes a comma list. */
    function formatValue(raw) {
      const value = String(raw).trim();
      if (value.startsWith("[") && value.endsWith("]")) {
        return value.slice(1, -1)
          .split(",")
          .map((item) => unquote(item.trim()))
          .filter(Boolean)
          .join(", ");
      }
      return unquote(value);
    }

    function unquote(value) {
      const quoted = value.length > 1 &&
        ((value.startsWith('"') && value.endsWith('"')) ||
          (value.startsWith("'") && value.endsWith("'")));
      return quoted ? value.slice(1, -1) : value;
    }

    function parseFrontmatter(text) {
      const m = /^\+\+\+\r?\n([\s\S]*?)\r?\n\+\+\+/.exec(text);
      if (!m) return null;
      const out = {};
      for (const line of m[1].split(/\r?\n/)) {
        const pair = /^\s*([A-Za-z_][A-Za-z0-9_-]*)\s*=\s*(.+?)\s*$/.exec(line);
        if (pair) out[pair[1]] = pair[2];
      }
      return out;
    }

    const formatSize = (bytes) =>
      bytes < 1024 ? bytes + " B" : (bytes / 1024).toFixed(1) + " kB";
  })();
</script>
{{end}}