const sourceEl = document.querySelector("#source");
const targetEl = document.querySelector("#target");
const inputEl = document.querySelector("#input");
const translateBtn = document.querySelector("#translate");
const clearBtn = document.querySelector("#clearInput");
const statusEl = document.querySelector("#status");
const denelaOut = document.querySelector("#denelaOut");
const englishOut = document.querySelector("#englishOut");
const turkishOut = document.querySelector("#turkishOut");
const checkline = document.querySelector("#checkline");
const breakdownBody = document.querySelector("#breakdown");
const analysisEl = document.querySelector("#analysis");
const warningsEl = document.querySelector("#warnings");
const tokenCountEl = document.querySelector("#tokenCount");
const breakdownColumns = [
  ["form", "Form"],
  ["pos", "Part"],
  ["meaning_en", "English"],
  ["meaning_tr", "Turkish"],
  ["status", "Status"]
];

function setStatus(text, state = "") {
  statusEl.className = `status ${state}`.trim();
  statusEl.innerHTML = "";
  const dot = document.createElement("span");
  dot.className = "status-dot";
  const label = document.createElement("span");
  label.textContent = text;
  statusEl.append(dot, label);
}

async function loadStatus() {
  const response = await fetch("/api/status");
  const status = await response.json();
  const backend = status.local_model_available ? "local model" : status.translation_backend;
  const model = status.local_model_available
    ? "specialized translators"
    : [status.llm_provider, status.llm_model].filter(Boolean).join(" · ");
  const pieces = [backend, model, `${status.lexicon_entries} entries`].filter(Boolean);
  setStatus(pieces.join(" · "), "ready");
}

function renderRows(rows) {
  breakdownBody.innerHTML = "";
  tokenCountEl.textContent = `${rows?.length || 0} tokens`;

  if (!rows || !rows.length) {
    const tr = document.createElement("tr");
    tr.className = "empty-row";
    const td = document.createElement("td");
    td.colSpan = 5;
    td.textContent = "No Denela tokens";
    tr.appendChild(td);
    breakdownBody.appendChild(tr);
    return;
  }

  for (const row of rows) {
    const tr = document.createElement("tr");
    for (const [key, label] of breakdownColumns) {
      const td = document.createElement("td");
      td.dataset.label = label;
      td.textContent = row[key] || "";
      tr.appendChild(td);
    }
    breakdownBody.appendChild(tr);
  }
}

function renderWarnings(result) {
  warningsEl.innerHTML = "";
  const warnings = [
    ...(result.warnings || []),
    ...((result.validation && result.validation.warnings) || [])
  ];
  for (const warning of warnings) {
    const li = document.createElement("li");
    li.textContent = warning;
    warningsEl.appendChild(li);
  }
}

function renderCheckline(result) {
  checkline.className = "checkline";
  const confidence = Number(result.confidence);
  const hasConfidence = Number.isFinite(confidence) && confidence > 0;

  if (result.validation && result.validation.ok === false) {
    checkline.classList.add("review");
    checkline.textContent = "Review needed";
    return;
  }

  if (result.meaning_preserved === true) {
    checkline.textContent = hasConfidence
      ? `Meaning preserved · ${confidence.toFixed(2)}`
      : "Meaning preserved";
    return;
  }

  if (result.meaning_preserved === false) {
    checkline.classList.add("review");
    checkline.textContent = hasConfidence
      ? `Meaning needs review · ${confidence.toFixed(2)}`
      : "Meaning needs review";
    return;
  }

  checkline.textContent = result.backend === "local_model" ? "Local model" : "Translated";
}

function renderResult(result) {
  denelaOut.textContent = result.denela || "";
  englishOut.textContent = result.english || "";
  turkishOut.textContent = result.turkish || "";
  analysisEl.textContent = result.analysis || "";
  renderCheckline(result);
  renderRows(result.tokens || []);
  renderWarnings(result);
}

async function translate() {
  const text = inputEl.value.trim();
  if (!text) return;
  translateBtn.disabled = true;
  translateBtn.textContent = "Translating";
  checkline.className = "checkline";
  checkline.textContent = "Working";

  try {
    const response = await fetch("/api/translate", {
      method: "POST",
      headers: {"Content-Type": "application/json"},
      body: JSON.stringify({
        text,
        source: sourceEl.value,
        target: targetEl.value
      })
    });
    if (!response.ok) {
      const errorText = await response.text();
      throw new Error(errorText);
    }
    renderResult(await response.json());
  } catch (error) {
    checkline.className = "checkline error";
    checkline.textContent = "Translation failed";
    analysisEl.textContent = error.message;
    renderRows([]);
    warningsEl.innerHTML = "";
  } finally {
    translateBtn.disabled = false;
    translateBtn.textContent = "Translate";
  }
}

async function copyTarget(targetId, button) {
  const target = document.querySelector(`#${targetId}`);
  const text = target?.textContent?.trim();
  if (!text) return;

  try {
    await navigator.clipboard.writeText(text);
    const original = button.textContent;
    button.textContent = "Copied";
    setTimeout(() => {
      button.textContent = original;
    }, 1100);
  } catch {
    button.textContent = "Copy failed";
    setTimeout(() => {
      button.textContent = "Copy";
    }, 1100);
  }
}

translateBtn.addEventListener("click", translate);
clearBtn.addEventListener("click", () => {
  inputEl.value = "";
  inputEl.focus();
});

document.querySelectorAll("[data-copy-target]").forEach((button) => {
  button.addEventListener("click", () => copyTarget(button.dataset.copyTarget, button));
});

inputEl.addEventListener("keydown", (event) => {
  if ((event.metaKey || event.ctrlKey) && event.key === "Enter") {
    translate();
  }
});

loadStatus().catch(() => {
  setStatus("Status unavailable", "error");
});
renderRows([]);
translate();