// views/browser.js — file/folder listing with breadcrumbs, mkdir, upload, delete, rename.

import { post, uploadFile, downloadURL } from "../rc.js";
import { toast, formatBytes, formatTime } from "../state.js";
import { t } from "../i18n.js";

export async function renderBrowse({ remote, path }) {
  const app = document.getElementById("app");
  if (!remote) {
    app.innerHTML = `<div class="empty"><h3>${t("browser.no_remote_title")}</h3><p><a href="#/remotes">${t("browser.pick_remote")}</a> ${t("browser.no_remote_body")}</p></div>`;
    return;
  }

  const fs = `${remote}:`;

  app.innerHTML = `
    <div class="section-head">
      <div>
        <h2>${escapeHtml(remote)}</h2>
        <p class="subtitle">${escapeHtml(path || "(root)")}</p>
      </div>
      <div class="toolbar">
        <input type="file" id="upload-input" multiple style="display:none">
        <button class="btn btn-secondary btn-sm" data-action="mkdir">${t("browser.mkdir")}</button>
        <button class="btn btn-secondary btn-sm" data-action="upload">${t("browser.upload")}</button>
      </div>
    </div>
    <div id="breadcrumbs" class="breadcrumbs"></div>
    <div id="browser-card" class="card-outline">
      <p class="empty">${t("loading.title")}…</p>
    </div>
  `;

  const breadcrumbsEl = document.getElementById("breadcrumbs");
  renderBreadcrumbs(breadcrumbsEl, remote, path);

  const card = document.getElementById("browser-card");
  const fileInput = document.getElementById("upload-input");

  try {
    const res = await post("operations/list", {
      fs,
      remote: path || "",
      opt: { noModTime: false, noMimeType: true, showHash: false },
    });
    const items = (res && res.list) || [];
    renderTable(card, fs, path, items);
  } catch (e) {
    card.innerHTML = `<div class="empty"><h3>${t("error.couldnt_list")}</h3><p>${escapeHtml(e.message)}</p></div>`;
    toast(`${t("browser.browse_failed")}: ${e.message}`, "error");
  }

  app.querySelector('[data-action="mkdir"]').addEventListener("click", () => {
    openModal(
      t("browser.mkdir_title"),
      [
        { name: "name", label: t("browser.mkdir_field"), type: "text", placeholder: t("browser.mkdir_placeholder") },
      ],
      async ({ name }) => {
        if (!name) return;
        const target = path ? `${path}/${name}` : name;
        await post("operations/mkdir", { fs, remote: target });
        toast(t("browser.mkdir_created", name), "success");
      },
    ).catch((e) => toast(`${t("browser.mkdir_failed")}: ${e.message}`, "error"));
  });

  app.querySelector('[data-action="upload"]').addEventListener("click", () => {
    fileInput.value = "";
    fileInput.click();
  });

  fileInput.addEventListener("change", async () => {
    const files = Array.from(fileInput.files || []);
    if (files.length === 0) return;
    try {
      await uploadFile(fs, path || "", files);
      toast(t("browser.uploaded", files.length), "success");
      location.reload();
    } catch (e) {
      toast(`${t("browser.upload_failed")}: ${e.message}`, "error");
    }
  });
}

function renderBreadcrumbs(el, remote, path) {
  const segments = (path || "").split("/").filter(Boolean);
  let html = `<a href="#/remotes">${t("nav.remotes")}</a><span class="sep">/</span>`;
  html += `<a href="#/browse/${encodeURIComponent(remote)}">${escapeHtml(remote)}</a>`;
  let acc = "";
  for (let i = 0; i < segments.length; i++) {
    const seg = segments[i];
    acc = acc ? `${acc}/${seg}` : seg;
    const isLast = i === segments.length - 1;
    html += `<span class="sep">/</span>`;
    if (isLast) {
      html += `<span class="current">${escapeHtml(seg)}</span>`;
    } else {
      html += `<a href="#/browse/${encodeURIComponent(remote)}/${acc.split("/").map(encodeURIComponent).join("/")}">${escapeHtml(seg)}</a>`;
    }
  }
  el.innerHTML = html;
}

function renderTable(card, fs, path, items) {
  if (!items || items.length === 0) {
    card.innerHTML = `
      <div class="empty">
        <h3>${t("browser.empty_title")}</h3>
        <p>${t("browser.empty_body")}</p>
      </div>
    `;
    return;
  }

  items.sort((a, b) => {
    if (a.IsDir !== b.IsDir) return a.IsDir ? -1 : 1;
    return a.Name.localeCompare(b.Name);
  });

  const parentHref = parentLink(fs, path);
  const rows = items.map((item) => row(fs, path, item)).join("");

  card.innerHTML = `
    <table class="table">
      <thead>
        <tr>
          <th>${t("browser.col.name")}</th>
          <th class="col-num">${t("browser.col.size")}</th>
          <th>${t("browser.col.modified")}</th>
          <th class="col-num">${t("browser.col.actions")}</th>
        </tr>
      </thead>
      <tbody>
        ${parentHref ? `<tr class="row-dir"><td class="col-name"><a href="${parentHref}">${t("browser.up")}</a></td><td></td><td></td><td></td></tr>` : ""}
        ${rows}
      </tbody>
    </table>
  `;

  card.querySelectorAll("[data-delete]").forEach((btn) => {
    btn.addEventListener("click", () => onDelete(fs, path, btn.dataset.delete));
  });
  card.querySelectorAll("[data-rename]").forEach((btn) => {
    btn.addEventListener("click", () => onRename(fs, path, btn.dataset.rename));
  });
}

function row(fs, path, item) {
  const itemPath = path ? `${path}/${item.Name}` : item.Name;
  if (item.IsDir) {
    const href = `#/browse/${fs.replace(/:$/, "")}/${itemPath.split("/").map(encodeURIComponent).join("/")}`;
    return `
      <tr class="row-dir">
        <td class="col-name"><a href="${href}">${icon("dir")} ${escapeHtml(item.Name)}/</a></td>
        <td class="col-num col-mono">—</td>
        <td class="col-mono">${escapeHtml(formatTime(item.ModTime))}</td>
        <td class="col-num"></td>
      </tr>
    `;
  }
  return `
    <tr>
      <td class="col-name">
        <a href="${downloadURL(fs, path, item.Name)}" download="${escapeHtml(item.Name)}">${icon("file")} ${escapeHtml(item.Name)}</a>
      </td>
      <td class="col-num col-mono">${escapeHtml(formatBytes(item.Size))}</td>
      <td class="col-mono">${escapeHtml(formatTime(item.ModTime))}</td>
      <td class="col-num">
        <button class="btn btn-secondary btn-sm" data-rename="${escapeHtml(itemPath)}">${t("browser.rename")}</button>
        <button class="btn btn-danger btn-sm" data-delete="${escapeHtml(itemPath)}">${t("browser.delete")}</button>
      </td>
    </tr>
  `;
}

function icon(kind) {
  if (kind === "dir") {
    return `<span style="display:inline-block;width:1em;color:var(--color-primary)">▸</span>`;
  }
  return `<span style="display:inline-block;width:1em;color:var(--color-muted-soft)">📄</span>`;
}

function parentLink(fs, path) {
  if (!path) return "";
  const segments = path.split("/").filter(Boolean);
  segments.pop();
  const parent = segments.join("/");
  const remote = fs.replace(/:$/, "");
  if (!parent) {
    return `#/browse/${encodeURIComponent(remote)}`;
  }
  return `#/browse/${encodeURIComponent(remote)}/${parent.split("/").map(encodeURIComponent).join("/")}`;
}

async function onDelete(fs, path, itemPath) {
  if (!confirm(t("browser.delete_confirm", itemPath))) return;
  try {
    await post("operations/deletefile", { fs, remote: itemPath });
    toast(t("browser.deleted", itemPath), "success");
    location.reload();
  } catch (e) {
    toast(`${t("browser.delete_file_failed")}: ${e.message}`, "error");
  }
}

async function onRename(fs, path, itemPath) {
  const segments = itemPath.split("/");
  const oldName = segments.pop();
  try {
    await openModal(
      t("browser.rename_title", oldName),
      [{ name: "name", label: t("browser.rename_field"), type: "text", value: oldName }],
      async ({ name }) => {
        if (!name || name === oldName) return;
        const dir = segments.join("/");
        const dst = dir ? `${dir}/${name}` : name;
        await post("operations/movefile", {
          srcFs: fs,
          srcRemote: itemPath,
          dstFs: fs,
          dstRemote: dst,
        });
        toast(t("browser.renamed", name), "success");
      },
    );
    location.reload();
  } catch (e) {
    toast(`${t("browser.rename_failed")}: ${e.message}`, "error");
  }
}

// --- Modal helper ---
export function openModal(title, fields, onSubmit) {
  return new Promise((resolve) => {
    const root = document.getElementById("modal-root");
    const formHtml = fields
      .map(
        (f) => `
        <div class="field">
          <label>${escapeHtml(f.label)}</label>
          <input class="input" name="${escapeHtml(f.name)}" type="${escapeHtml(f.type || "text")}" value="${escapeHtml(f.value || "")}" placeholder="${escapeHtml(f.placeholder || "")}">
        </div>`,
      )
      .join("");

    root.innerHTML = `
      <div class="modal-overlay">
        <form class="modal">
          <h3>${escapeHtml(title)}</h3>
          ${formHtml}
          <div class="modal-actions">
            <button type="button" class="btn btn-secondary" data-cancel>${t("browser.modal.cancel")}</button>
            <button type="submit" class="btn btn-primary">${t("browser.modal.ok")}</button>
          </div>
        </form>
      </div>
    `;

    const overlay = root.querySelector(".modal-overlay");
    const form = root.querySelector("form");

    const close = () => {
      root.innerHTML = "";
    };

    overlay.addEventListener("click", (e) => {
      if (e.target === overlay) close();
    });
    form.querySelector("[data-cancel]").addEventListener("click", () => {
      close();
      resolve(null);
    });
    form.addEventListener("submit", async (e) => {
      e.preventDefault();
      const data = {};
      for (const f of fields) {
        data[f.name] = form.elements[f.name].value;
      }
      try {
        await onSubmit(data);
        close();
        resolve(data);
      } catch (err) {
        toast(err.message, "error");
      }
    });
    const first = form.elements[fields[0].name];
    if (first) first.focus();
  });
}

function escapeHtml(s) {
  return String(s)
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&#39;");
}