{% extends 'base.html' %}

{% block title %}Resize Image — WebTools{% endblock %}

{% block content %}
<div class="container py-5">

  <!-- Breadcrumb -->
  <nav aria-label="breadcrumb" class="mb-4">
    <ol class="breadcrumb">
      <li class="breadcrumb-item"><a href="{{ url_for('main.index') }}">Home</a></li>
      <li class="breadcrumb-item"><a href="{{ url_for('main.index') }}#image">Image Tools</a></li>
      <li class="breadcrumb-item active" aria-current="page">Resize Image</li>
    </ol>
  </nav>

  <!-- Page Header -->
  <div class="row mb-4">
    <div class="col">
      <h1 class="h2 fw-bold"><i class="fa-solid fa-expand me-2 text-primary"></i>Resize Image</h1>
      <p class="text-muted">Resize your image by exact pixel dimensions or by percentage scale.</p>
    </div>
  </div>

  <div class="row g-4">
    <!-- Left column: form -->
    <div class="col-lg-6">
      <div class="card shadow-sm border-0">
        <div class="card-body p-4">

          <!-- Drop zone -->
          <div id="dropZone" class="border border-2 rounded-3 text-center p-5 mb-4 position-relative"
               style="border-style:dashed!important;cursor:pointer;transition:background .2s;">
            <i class="fa-solid fa-cloud-arrow-up fa-2x text-muted mb-2"></i>
            <p class="mb-1 fw-semibold">Drag &amp; drop an image here</p>
            <p class="text-muted small mb-3">or click to browse</p>
            <input type="file" id="imageInput" name="image" accept="image/*"
                   class="position-absolute top-0 start-0 w-100 h-100 opacity-0" style="cursor:pointer;">
          </div>

          <!-- Preview -->
          <div id="previewWrap" class="mb-4 d-none text-center">
            <img id="imagePreview" src="" alt="Preview" class="img-fluid rounded shadow-sm" style="max-height:180px;">
            <p id="previewInfo" class="small text-muted mt-2 mb-0"></p>
          </div>

          <!-- Resize mode toggle -->
          <div class="mb-4">
            <label class="form-label fw-semibold">Resize Mode</label>
            <div class="btn-group w-100" role="group" aria-label="Resize mode">
              <input type="radio" class="btn-check" name="resizeMode" id="modeDimensions" value="dimensions" checked>
              <label class="btn btn-outline-primary" for="modeDimensions">
                <i class="fa-solid fa-ruler-combined me-1"></i>By Dimensions (px)
              </label>
              <input type="radio" class="btn-check" name="resizeMode" id="modePercent" value="percent">
              <label class="btn btn-outline-primary" for="modePercent">
                <i class="fa-solid fa-percent me-1"></i>By Percentage
              </label>
            </div>
          </div>

          <!-- Dimensions panel -->
          <div id="dimensionsPanel">
            <div class="row g-3 mb-3">
              <div class="col-6">
                <label for="widthInput" class="form-label">Width (px)</label>
                <input type="number" class="form-control" id="widthInput" name="width"
                       min="1" max="10000" placeholder="e.g. 800">
              </div>
              <div class="col-6">
                <label for="heightInput" class="form-label">Height (px)</label>
                <input type="number" class="form-control" id="heightInput" name="height"
                       min="1" max="10000" placeholder="e.g. 600">
              </div>
            </div>
            <div class="form-check mb-4">
              <input class="form-check-input" type="checkbox" id="aspectRatio" name="maintain_aspect" checked>
              <label class="form-check-label" for="aspectRatio">
                <i class="fa-solid fa-lock me-1 text-muted"></i>Maintain aspect ratio
              </label>
            </div>
          </div>

          <!-- Percentage panel -->
          <div id="percentPanel" class="d-none mb-4">
            <label for="percentInput" class="form-label">
              Scale: <span id="percentVal" class="badge bg-primary">100</span>%
            </label>
            <input type="range" class="form-range" id="percentInput" name="percent"
                   min="1" max="400" value="100">
            <div class="d-flex justify-content-between">
              <small class="text-muted">1%</small>
              <small class="text-muted">400%</small>
            </div>
          </div>

          <!-- Submit -->
          <div class="d-grid">
            <button id="submitBtn" type="button" class="btn btn-primary btn-lg" disabled>
              <i class="fa-solid fa-expand me-2"></i>Resize Image
            </button>
          </div>

        </div>
      </div>
    </div>

    <!-- Right column: results -->
    <div class="col-lg-6">
      <div id="errorAlert" class="alert alert-danger d-none" role="alert">
        <i class="fa-solid fa-circle-xmark me-2"></i><span id="errorMsg"></span>
      </div>

      <div id="loadingCard" class="card shadow-sm border-0 d-none">
        <div class="card-body p-5 text-center">
          <div class="spinner-border text-primary mb-3" style="width:3rem;height:3rem;" role="status">
            <span class="visually-hidden">Processing...</span>
          </div>
          <p class="fw-semibold mb-0">Resizing image…</p>
        </div>
      </div>

      <div id="resultsCard" class="card shadow-sm border-0 d-none">
        <div class="card-header bg-success text-white fw-semibold">
          <i class="fa-solid fa-circle-check me-2"></i>Resize Complete
        </div>
        <div class="card-body p-4">
          <div class="row g-3 mb-4">
            <div class="col-6">
              <div class="p-3 rounded bg-light text-center">
                <p class="small text-muted mb-1">Original Dimensions</p>
                <p id="origDims" class="h5 fw-bold mb-0">—</p>
              </div>
            </div>
            <div class="col-6">
              <div class="p-3 rounded bg-light text-center">
                <p class="small text-muted mb-1">New Dimensions</p>
                <p id="newDims" class="h5 fw-bold mb-0 text-success">—</p>
              </div>
            </div>
          </div>
          <div class="d-grid">
            <a id="downloadLink" href="#" class="btn btn-success btn-lg" download>
              <i class="fa-solid fa-download me-2"></i>Download Resized Image
            </a>
          </div>
        </div>
      </div>

      <div id="placeholderCard" class="card border-0 bg-light">
        <div class="card-body p-5 text-center text-muted">
          <i class="fa-solid fa-image fa-3x mb-3 opacity-25"></i>
          <p class="mb-0">Your resized image will appear here after processing.</p>
        </div>
      </div>
    </div>
  </div>
</div>
{% endblock %}

{% block scripts %}
<script>
(function () {
  'use strict';

  const dropZone     = document.getElementById('dropZone');
  const fileInput    = document.getElementById('imageInput');
  const previewWrap  = document.getElementById('previewWrap');
  const previewInfo  = document.getElementById('previewInfo');
  const submitBtn    = document.getElementById('submitBtn');
  const errorAlert   = document.getElementById('errorAlert');
  const errorMsg     = document.getElementById('errorMsg');
  const loadingCard  = document.getElementById('loadingCard');
  const resultsCard  = document.getElementById('resultsCard');
  const placeholder  = document.getElementById('placeholderCard');
  const dimPanel     = document.getElementById('dimensionsPanel');
  const pctPanel     = document.getElementById('percentPanel');
  const percentSlider= document.getElementById('percentInput');
  const percentVal   = document.getElementById('percentVal');
  const widthInput   = document.getElementById('widthInput');
  const heightInput  = document.getElementById('heightInput');
  const aspectCheck  = document.getElementById('aspectRatio');

  let selectedFile = null;
  let origWidth = 0, origHeight = 0;

  // Mode toggle
  document.querySelectorAll('input[name="resizeMode"]').forEach(r => {
    r.addEventListener('change', () => {
      if (r.value === 'dimensions') {
        dimPanel.classList.remove('d-none');
        pctPanel.classList.add('d-none');
      } else {
        dimPanel.classList.add('d-none');
        pctPanel.classList.remove('d-none');
      }
    });
  });

  percentSlider.addEventListener('input', () => { percentVal.textContent = percentSlider.value; });

  // Aspect ratio lock
  widthInput.addEventListener('input', () => {
    if (aspectCheck.checked && origWidth && origHeight) {
      const w = parseInt(widthInput.value);
      if (!isNaN(w)) heightInput.value = Math.round(w * origHeight / origWidth);
    }
  });
  heightInput.addEventListener('input', () => {
    if (aspectCheck.checked && origWidth && origHeight) {
      const h = parseInt(heightInput.value);
      if (!isNaN(h)) widthInput.value = Math.round(h * origWidth / origHeight);
    }
  });

  dropZone.addEventListener('dragover', (e) => { e.preventDefault(); dropZone.classList.add('bg-primary','bg-opacity-10'); });
  dropZone.addEventListener('dragleave', () => { dropZone.classList.remove('bg-primary','bg-opacity-10'); });
  dropZone.addEventListener('drop', (e) => {
    e.preventDefault();
    dropZone.classList.remove('bg-primary','bg-opacity-10');
    if (e.dataTransfer.files[0]) handleFile(e.dataTransfer.files[0]);
  });
  fileInput.addEventListener('change', () => { if (fileInput.files[0]) handleFile(fileInput.files[0]); });

  function handleFile(file) {
    selectedFile = file;
    const reader = new FileReader();
    reader.onload = (e) => {
      const img = document.getElementById('imagePreview');
      img.src = e.target.result;
      img.onload = () => {
        origWidth  = img.naturalWidth;
        origHeight = img.naturalHeight;
        previewInfo.textContent = file.name + ' — ' + origWidth + ' × ' + origHeight + 'px';
        document.getElementById('origDims').textContent = origWidth + ' × ' + origHeight;
      };
      previewWrap.classList.remove('d-none');
    };
    reader.readAsDataURL(file);
    submitBtn.disabled = false;
    hideResults();
  }

  function hideResults() {
    errorAlert.classList.add('d-none');
    loadingCard.classList.add('d-none');
    resultsCard.classList.add('d-none');
    placeholder.classList.remove('d-none');
  }

  submitBtn.addEventListener('click', async () => {
    if (!selectedFile) return;
    errorAlert.classList.add('d-none');
    loadingCard.classList.remove('d-none');
    resultsCard.classList.add('d-none');
    placeholder.classList.add('d-none');
    submitBtn.disabled = true;

    const mode = document.querySelector('input[name="resizeMode"]:checked').value;
    const fd = new FormData();
    fd.append('image', selectedFile);
    fd.append('mode', mode);
    if (mode === 'dimensions') {
      fd.append('width', widthInput.value);
      fd.append('height', heightInput.value);
      fd.append('maintain_aspect', aspectCheck.checked ? '1' : '0');
    } else {
      fd.append('percent', percentSlider.value);
    }

    try {
      const resp = await fetch('/tools/image/resize/process', { method: 'POST', body: fd });
      if (!resp.ok) {
        let msg = 'Server error ' + resp.status;
        try { const j = await resp.json(); msg = j.error || msg; } catch(_) {}
        throw new Error(msg);
      }
      const newW = resp.headers.get('X-Width');
      const newH = resp.headers.get('X-Height');
      if (newW && newH) document.getElementById('newDims').textContent = newW + ' × ' + newH;

      const blob = await resp.blob();
      const url  = URL.createObjectURL(blob);
      const dl   = document.getElementById('downloadLink');
      dl.href     = url;
      dl.download = 'resized_' + selectedFile.name;

      loadingCard.classList.add('d-none');
      resultsCard.classList.remove('d-none');
    } catch (err) {
      loadingCard.classList.add('d-none');
      placeholder.classList.remove('d-none');
      errorMsg.textContent = err.message;
      errorAlert.classList.remove('d-none');
    } finally {
      submitBtn.disabled = false;
    }
  });
})();
</script>
{% endblock %}