{{- /* 過去365日分のカレンダーを表示 */ -}}
{{- $endDate := now -}}
{{- $startDate := $endDate.AddDate 0 0 -364 -}}

{{- /* カレンダー用のセクション設定（未設定の場合はmainSectionsを使用） */ -}}
{{- $calendarSections := site.Params.calendarSections | default site.Params.mainSections -}}

{{- /* 投稿日ごとの記事を集計 */ -}}
{{- $postsByDate := dict -}}

{{- range where site.RegularPages "Type" "in" $calendarSections -}}
  {{- $dateStr := .Date.Format "2006-01-02" -}}
  {{- $posts := slice -}}
  {{- if isset $postsByDate $dateStr -}}
    {{- $posts = index $postsByDate $dateStr -}}
  {{- end -}}
  {{- $posts = $posts | append . -}}
  {{- $postsByDate = merge $postsByDate (dict $dateStr $posts) -}}
{{- end -}}

<div class="activity-calendar">
  <h3 class="calendar-title">Post Activity (Last 365 Days)</h3>
  <div class="calendar-container">
    <div class="calendar-wrapper">
      {{- /* 曜日ラベル */ -}}
      <div class="calendar-weekdays">
        <div class="weekday-label"></div>
        <div class="weekday-label">Mon</div>
        <div class="weekday-label"></div>
        <div class="weekday-label">Wed</div>
        <div class="weekday-label"></div>
        <div class="weekday-label">Fri</div>
        <div class="weekday-label"></div>
      </div>
      
      {{- /* 月ラベルとグリッド */ -}}
      <div class="calendar-content">
        <div class="calendar-months" id="calendar-months"></div>
        <div class="calendar-grid" id="calendar-grid">
          {{- $currentDate := $startDate -}}
          {{- $totalDays := 365 -}}
          
          {{- /* 最初の週の空白セルを追加 */ -}}
          {{- $firstWeekday := $startDate.Weekday -}}
          {{- range seq 0 (sub (int $firstWeekday) 1) -}}
            <div class="calendar-day empty"></div>
          {{- end -}}
          
          {{- /* 日付のセルを生成 */ -}}
          {{- range seq 0 $totalDays -}}
            {{- $dateStr := $currentDate.Format "2006-01-02" -}}
            {{- $count := 0 -}}
            {{- $hasClick := "" -}}
            {{- if isset $postsByDate $dateStr -}}
              {{- $posts := index $postsByDate $dateStr -}}
              {{- $count = len $posts -}}
              {{- $hasClick = "has-posts" -}}
            {{- end -}}
            
            {{- $level := "level-0" -}}
            {{- if gt $count 0 -}}
              {{- if eq $count 1 -}}
                {{- $level = "level-1" -}}
              {{- else if eq $count 2 -}}
                {{- $level = "level-2" -}}
              {{- else if eq $count 3 -}}
                {{- $level = "level-3" -}}
              {{- else -}}
                {{- $level = "level-4" -}}
              {{- end -}}
            {{- end -}}
            
            <div class="calendar-day {{ $level }} {{ $hasClick }}" 
                 data-date="{{ $dateStr }}" 
                 data-count="{{ $count }}"
                 title="{{ $dateStr }}: {{ $count }} post{{ if ne $count 1 }}s{{ end }}">
            </div>
            
            {{- $currentDate = $currentDate.AddDate 0 0 1 -}}
          {{- end -}}
        </div>
      </div>
    </div>
    
    <div class="calendar-legend">
      <span class="legend-label">Less</span>
      <div class="legend-item level-0"></div>
      <div class="legend-item level-1"></div>
      <div class="legend-item level-2"></div>
      <div class="legend-item level-3"></div>
      <div class="legend-item level-4"></div>
      <span class="legend-label">More</span>
    </div>
  </div>
  
  {{- /* 記事リスト表示エリア */ -}}
  <div id="calendar-posts" class="calendar-posts-container" style="display: none;">
    <div class="calendar-posts-header">
      <h4 id="calendar-posts-title"></h4>
      <button class="calendar-posts-close">&times;</button>
    </div>
    <ul id="calendar-posts-list" class="calendar-posts-list"></ul>
  </div>
</div>

{{- /* 記事データをJavaScriptに渡す */ -}}
<script id="calendar-posts-data" type="application/json">
{{- $postsJSON := dict -}}
{{- range $date, $posts := $postsByDate -}}
  {{- $postList := slice -}}
  {{- range $posts -}}
    {{- $postList = $postList | append (dict "title" .Title "url" .Permalink) -}}
  {{- end -}}
  {{- $postsJSON = merge $postsJSON (dict $date $postList) -}}
{{- end -}}
{{- $postsJSON | jsonify -}}
</script>

<style>
.activity-calendar {
  margin: 30px 0;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.calendar-title {
  margin: 0 0 15px 0;
  font-size: 18px;
  font-weight: 600;
  color: #24292f;
}

.calendar-container {
  overflow-x: auto;
}

.calendar-wrapper {
  display: flex;
  gap: 10px;
  min-width: fit-content;
}

.calendar-weekdays {
  display: grid;
  grid-template-rows: repeat(7, 12px);
  gap: 3px;
  padding-top: 20px;
}

.weekday-label {
  font-size: 9px;
  color: #656d76;
  text-align: right;
  padding-right: 4px;
  line-height: 12px;
}

.calendar-content {
  flex: 1;
  min-width: fit-content;
}

.calendar-months {
  display: flex;
  height: 15px;
  margin-bottom: 5px;
  font-size: 10px;
  color: #656d76;
  position: relative;
}

.month-label {
  font-size: 10px;
  color: #656d76;
  padding-left: 2px;
  position: absolute;
}

.calendar-grid {
  display: grid;
  grid-template-rows: repeat(7, 12px);
  grid-auto-flow: column;
  grid-auto-columns: 12px;
  gap: 3px;
  min-width: fit-content;
}

.calendar-day {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  cursor: default;
  transition: all 0.2s ease;
}

.calendar-day.has-posts {
  cursor: pointer;
}

.calendar-day.has-posts:hover {
  transform: scale(1.2);
  outline: 1px solid rgba(27, 31, 36, 0.15);
  outline-offset: 2px;
}

.calendar-day.empty {
  background: transparent;
  cursor: default;
}

.calendar-day.empty:hover {
  transform: none;
  outline: none;
}

/* GitHub風のカラースキーム */
.calendar-day.level-0 {
  background-color: #ebedf0;
}

.calendar-day.level-1 {
  background-color: #9be9a8;
}

.calendar-day.level-2 {
  background-color: #40c463;
}

.calendar-day.level-3 {
  background-color: #30a14e;
}

.calendar-day.level-4 {
  background-color: #216e39;
}

.calendar-legend {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: #656d76;
  justify-content: flex-end;
  margin-top: 10px;
}

.legend-label {
  margin: 0 4px;
}

.legend-item {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: inline-block;
}

.legend-item.level-0 {
  background-color: #ebedf0;
}

.legend-item.level-1 {
  background-color: #9be9a8;
}

.legend-item.level-2 {
  background-color: #40c463;
}

.legend-item.level-3 {
  background-color: #30a14e;
}

.legend-item.level-4 {
  background-color: #216e39;
}

/* 記事リスト表示エリア */
.calendar-posts-container {
  margin-top: 20px;
  padding: 20px;
  background: #f6f8fa;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  animation: slideDown 0.3s ease;
  position: relative;
  z-index: 1000;
  min-height: 100px;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.calendar-posts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.calendar-posts-header h4 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: #24292f;
}

.calendar-posts-close {
  background: none;
  border: none;
  font-size: 24px;
  color: #57606a;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.calendar-posts-close:hover {
  background: #d0d7de;
  color: #24292f;
}

.calendar-posts-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.calendar-posts-list li {
  padding: 8px 0;
  border-bottom: 1px solid #d0d7de;
}

.calendar-posts-list li:last-child {
  border-bottom: none;
}

.calendar-posts-list li a {
  color: #0969da;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
}

.calendar-posts-list li a:hover {
  color: #0550ae;
  text-decoration: underline;
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
  .activity-calendar {
    background: #0d1117;
  }
  
  .calendar-title {
    color: #c9d1d9;
  }
  
  .calendar-day.level-0 {
    background-color: #161b22;
  }
  
  .calendar-day.level-1 {
    background-color: #0e4429;
  }
  
  .calendar-day.level-2 {
    background-color: #006d32;
  }
  
  .calendar-day.level-3 {
    background-color: #26a641;
  }
  
  .calendar-day.level-4 {
    background-color: #39d353;
  }
  
  .calendar-legend {
    color: #8b949e;
  }
  
  .calendar-months,
  .weekday-label,
  .month-label {
    color: #8b949e;
  }
  
  .calendar-posts-container {
    background: #0d1117;
    border-color: #30363d;
  }
  
  .calendar-posts-header h4 {
    color: #c9d1d9;
  }
  
  .calendar-posts-close {
    color: #8b949e;
  }
  
  .calendar-posts-close:hover {
    color: #c9d1d9;
  }
  
  .calendar-posts-list li a {
    color: #58a6ff;
  }
  
  .calendar-posts-list li a:hover {
    color: #79c0ff;
  }
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .calendar-grid {
    grid-template-rows: repeat(7, 10px);
    grid-auto-columns: 10px;
    gap: 2px;
  }
  
  .calendar-weekdays {
    grid-template-rows: repeat(7, 10px);
    gap: 2px;
    padding-top: 15px;
  }
  
  .weekday-label {
    font-size: 8px;
    line-height: 10px;
  }
  
  .calendar-day,
  .legend-item {
    width: 10px;
    height: 10px;
  }
}
</style>

<script>
document.addEventListener('DOMContentLoaded', function() {
  // 月ラベルを生成
  const monthsContainer = document.getElementById('calendar-months');
  const grid = document.getElementById('calendar-grid');
  const days = grid.querySelectorAll('.calendar-day:not(.empty)');
  
  if (days.length > 0) {
    let lastMonth = '';
    const monthPositions = [];
    
    days.forEach((day, index) => {
      const date = day.getAttribute('data-date');
      const month = date.substring(0, 7);
      
      if (month !== lastMonth) {
        const monthName = new Date(date).toLocaleDateString('en-US', { month: 'short' });
        const emptyCount = grid.querySelectorAll('.calendar-day.empty').length;
        const weekColumn = Math.floor((index + emptyCount) / 7);
        monthPositions.push({ month: monthName, column: weekColumn });
        lastMonth = month;
      }
    });
    
    monthPositions.forEach(function(pos) {
      const label = document.createElement('div');
      label.className = 'month-label';
      label.textContent = pos.month;
      label.style.left = (pos.column * 15) + 'px';
      monthsContainer.appendChild(label);
    });
  }
  
  // 記事データを取得
  const postsDataElement = document.getElementById('calendar-posts-data');
  if (!postsDataElement) return;
  
  let postsData;
  try {
    const rawData = postsDataElement.textContent;
    postsData = JSON.parse(rawData);
    
    if (typeof postsData === 'string') {
      postsData = JSON.parse(postsData);
    }
  } catch (e) {
    console.error('Failed to parse posts data:', e);
    return;
  }
  
  const calendarDays = document.querySelectorAll('.calendar-day.has-posts');
  const postsContainer = document.getElementById('calendar-posts');
  const postsTitle = document.getElementById('calendar-posts-title');
  const postsList = document.getElementById('calendar-posts-list');
  const closeButton = document.querySelector('.calendar-posts-close');
  
  calendarDays.forEach(function(day) {
    day.addEventListener('click', function() {
      const date = this.getAttribute('data-date');
      const posts = postsData[date];
      
      if (posts && posts.length > 0) {
        const count = posts.length;
        postsTitle.textContent = date + ' - ' + count + ' post' + (count > 1 ? 's' : '');
        
        postsList.innerHTML = '';
        posts.forEach(function(post) {
          const li = document.createElement('li');
          const a = document.createElement('a');
          a.href = post.url;
          a.textContent = post.title;
          li.appendChild(a);
          postsList.appendChild(li);
        });
        
        postsContainer.style.display = 'block';
        postsContainer.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
      }
    });
  });
  
  if (closeButton) {
    closeButton.addEventListener('click', function() {
      postsContainer.style.display = 'none';
    });
  }
});
</script>