<script lang="ts">
  import { tick } from "svelte";
  import type { EnergyLevel, TaskBucket, TaskEntry, TaskList } from "$lib/types/app";
  import { invoke } from "@tauri-apps/api/core";
  import {
    tasks, addTask, completeTask, uncompleteTask, deleteTask, updateTask,
    setTaskEnergy,
    taskLists, addTaskList, renameTaskList, deleteTaskList,
    settings, saveSettings,
  } from "$lib/stores/page.svelte.js";
  import { recentCompletions, todayCount } from "$lib/stores/completionStats.svelte";
  import WipTaskList from '$lib/components/WipTaskList.svelte';
  import EmptyState from '$lib/components/EmptyState.svelte';
  import CompletionSparkline from "$lib/components/CompletionSparkline.svelte";
  import EnergyChip from '$lib/components/EnergyChip.svelte';
  import { SquareCheck, Search, ExternalLink, ChevronLeft, ArrowUpDown, Plus, X, ChevronRight, Zap } from 'lucide-svelte';
  import Card from "$lib/components/Card.svelte";
  import { formatTimestamp } from "$lib/utils/time.js";
  import { BUCKET_COLORS, EFFORT_LABELS, EFFORT_ORDER } from "$lib/utils/constants.js";

  let activeBucket = $state("all");
  let activeListId = $state("all");
  let showCompleted = $state(false);
  let quickInput = $state("");
  let searchQuery = $state("");
  let sidebarCollapsed = $state(false);
  let showNewList = $state(false);
  let newListName = $state("");
  let sortMode = $state("date");
  let showSortMenu = $state(false);
  let contextMenuListId = $state<string | null>(null);
  let editingListId = $state<string | null>(null);
  let editingName = $state("");
  let editingInputEl = $state<HTMLInputElement | null>(null);
  let newListInputEl = $state<HTMLInputElement | null>(null);

  const buckets: Array<{ id: "all" | TaskBucket; label: string }> = [
    { id: "all", label: "All" },
    { id: "inbox", label: "Inbox" },
    { id: "today", label: "Today" },
    { id: "soon", label: "Soon" },
    { id: "later", label: "Later" },
  ];
  const taskBucketOptions: TaskBucket[] = ["today", "soon", "later"];
  const effortOptions = ["quick", "medium", "deep"];

  function effortRank(effort: string): number {
    return EFFORT_ORDER[effort as keyof typeof EFFORT_ORDER] || 4;
  }

  function effortLabel(effort: string): string {
    return EFFORT_LABELS[effort as keyof typeof EFFORT_LABELS] || effort;
  }

  // Phase 3 energy sort: when the user has opted in and declared a
  // current energy, tasks matching that energy sort to the top. Tasks
  // with no energy tag are treated as Medium-equivalent, per the brief's
  // framing that unset is the normal case. Nothing is ever hidden —
  // "reserves" in the spec means de-prioritise, not filter.
  function energyMatchRank(task: TaskEntry, currentEnergy: EnergyLevel | null): number {
    if (!currentEnergy) return 0;
    const effective = task.energy ?? "medium";
    return effective === currentEnergy ? 0 : 1;
  }

  let filteredTasks = $derived.by(() => {
    let list = tasks.filter((t) => !t.done);
    if (activeBucket !== "all") {
      list = list.filter((t) => t.bucket === activeBucket);
    }
    if (activeListId !== "all") {
      if (activeListId === "inbox") {
        list = list.filter((t) => !t.listId);
      } else {
        list = list.filter((t) => t.listId === activeListId);
      }
    }
    if (searchQuery.trim()) {
      const q = searchQuery.toLowerCase();
      list = list.filter((t) => t.text.toLowerCase().includes(q));
    }
    if (sortMode === "quick-first") {
      list.sort((a, b) => effortRank(a.effort) - effortRank(b.effort));
    } else if (sortMode === "deep-first") {
      list.sort((a, b) => effortRank(b.effort) - effortRank(a.effort));
    }
    // Match-my-energy sort runs last (stable) so it reorders the result
    // of the effort-based sort rather than replacing it.
    if (settings.matchMyEnergy && settings.currentEnergy) {
      const energy = settings.currentEnergy;
      list.sort((a, b) => energyMatchRank(a, energy) - energyMatchRank(b, energy));
    }
    return list;
  });

  function cycleCurrentEnergy(next: EnergyLevel | null) {
    settings.currentEnergy = next;
    saveSettings();
  }

  function toggleMatchMyEnergy() {
    settings.matchMyEnergy = !settings.matchMyEnergy;
    saveSettings();
  }

  function energyLabel(level: EnergyLevel | null): string {
    switch (level) {
      case "high": return "High";
      case "medium": return "Medium";
      case "brain_dead": return "Brain-Dead";
      default: return "Not set";
    }
  }

  // ARIA radiogroup keyboard handling for the energy segmented control.
  // Full W3C APG Radio Group pattern: arrow keys cycle, Home / End jump
  // to ends, focus and selection move together. The options array lives
  // here so the keyboard handler and the render loop share one source
  // of truth — desynchronising them is the usual way these patterns
  // rot over time.
  type EnergyOption = { value: EnergyLevel | null; label: string };
  const energyOptions: EnergyOption[] = [
    { value: null, label: "—" },
    { value: "high", label: "High" },
    { value: "medium", label: "Med" },
    { value: "brain_dead", label: "Low" },
  ];
  let energyRadioGroupEl = $state<HTMLDivElement | null>(null);

  function selectEnergyByIndex(idx: number) {
    const clamped = Math.max(0, Math.min(energyOptions.length - 1, idx));
    const opt = energyOptions[clamped];
    cycleCurrentEnergy(opt.value);
    // Move focus to the newly-checked button so keyboard nav tracks
    // selection, per the ARIA radio pattern.
    const btn = energyRadioGroupEl?.querySelectorAll<HTMLButtonElement>('[role="radio"]')[clamped];
    btn?.focus();
  }

  function energyRadioKeydown(e: KeyboardEvent) {
    const current = energyOptions.findIndex((o) => o.value === settings.currentEnergy);
    const here = current < 0 ? 0 : current;
    switch (e.key) {
      case "ArrowRight":
      case "ArrowDown":
        e.preventDefault();
        selectEnergyByIndex((here + 1) % energyOptions.length);
        break;
      case "ArrowLeft":
      case "ArrowUp":
        e.preventDefault();
        selectEnergyByIndex((here - 1 + energyOptions.length) % energyOptions.length);
        break;
      case "Home":
        e.preventDefault();
        selectEnergyByIndex(0);
        break;
      case "End":
        e.preventDefault();
        selectEnergyByIndex(energyOptions.length - 1);
        break;
    }
  }

  let completedTasks = $derived.by(() => {
    let list = tasks.filter((t) => t.done);
    if (activeBucket !== "all") {
      list = list.filter((t) => t.bucket === activeBucket);
    }
    if (activeListId !== "all") {
      if (activeListId === "inbox") {
        list = list.filter((t) => !t.listId);
      } else {
        list = list.filter((t) => t.listId === activeListId);
      }
    }
    if (searchQuery.trim()) {
      const q = searchQuery.toLowerCase();
      list = list.filter((t) => t.text.toLowerCase().includes(q));
    }
    return list.slice(0, 20);
  });

  let bucketCounts = $derived.by(() => {
    const counts: Record<"all" | TaskBucket, number> = { all: 0, inbox: 0, today: 0, soon: 0, later: 0 };
    for (const t of tasks) {
      if (t.done) continue;
      counts.all++;
      if (counts[t.bucket] !== undefined) counts[t.bucket]++;
    }
    return counts;
  });

  function countForList(listId: string) {
    if (listId === "all") return tasks.filter((t) => !t.done).length;
    if (listId === "inbox") return tasks.filter((t) => !t.done && !t.listId).length;
    return tasks.filter((t) => !t.done && t.listId === listId).length;
  }

  let activeListName = $derived(
    activeListId === "all" ? "All Lists" : (taskLists.find((l) => l.id === activeListId)?.name || "Tasks")
  );

  function handleQuickAdd(e: KeyboardEvent) {
    if (e.key === "Enter" && quickInput.trim()) {
      const listId = (activeListId === "all" || activeListId === "inbox") ? null : activeListId;
      addTask({
        text: quickInput.trim(),
        bucket: (activeBucket === "all" ? "inbox" : activeBucket) as TaskBucket,
        listId,
      });
      quickInput = "";
    }
  }

  function setBucket(taskId: string, bucket: TaskBucket) {
    updateTask(taskId, { bucket });
  }

  function setEffort(taskId: string, effort: string) {
    updateTask(taskId, { effort: effort === tasks.find((t) => t.id === taskId)?.effort ? "" : effort });
  }

  function getListName(listId: string | null) {
    if (!listId) return null;
    return taskLists.find((l) => l.id === listId)?.name || null;
  }

  async function popOutTasks() {
    try {
      await invoke("open_task_window");
    } catch {
      window.open("/float", "_blank", "width=380,height=520");
    }
  }

  function handleCreateList(e: KeyboardEvent) {
    if (e.key === "Enter" && newListName.trim()) {
      addTaskList(newListName.trim());
      newListName = "";
      showNewList = false;
    }
    if (e.key === "Escape") { showNewList = false; newListName = ""; }
  }

  async function startRenaming(list: TaskList) {
    editingListId = list.id;
    editingName = list.name;
    contextMenuListId = null;
    await tick();
    editingInputEl?.focus();
    editingInputEl?.select();
  }

  function finishRenaming() {
    if (editingListId && editingName.trim()) {
      renameTaskList(editingListId, editingName.trim());
    }
    editingListId = null;
    editingName = "";
  }

  function handleDeleteList(id: string) {
    if (activeListId === id) activeListId = "all";
    deleteTaskList(id);
    contextMenuListId = null;
  }

  function toggleContextMenu(e: MouseEvent, listId: string) {
    e.preventDefault();
    e.stopPropagation();
    contextMenuListId = contextMenuListId === listId ? null : listId;
  }

  $effect(() => {
    if (showNewList) {
      tick().then(() => {
        newListInputEl?.focus();
        newListInputEl?.select();
      });
    }
  });
</script>

<div class="flex flex-col h-full animate-fade-in">
  <!-- Header -->
  <div class="flex items-center px-7 pt-6 pb-2">
    <div>
      <div class="flex items-baseline gap-3">
        <h2 class="text-xl font-display text-text italic">Tasks</h2>

        <!-- Phase 8 badge + sparkline. aria-live scoped to just this
             wrapper so screen readers announce completions without
             re-reading the rest of the header. -->
        <div
          class="flex items-center gap-2"
          aria-live="polite"
        >
          {#if todayCount() > 0}
            <span
              class="text-[11px] text-text-tertiary badge-today"
              aria-label={`${todayCount()} ${todayCount() === 1 ? "task" : "tasks"} completed today`}
            >
              {todayCount()} today
            </span>
          {/if}

          {#if settings.showMomentumSparkline}
            <CompletionSparkline data={recentCompletions} />
          {/if}
        </div>
      </div>

      <p class="text-[11px] text-text-tertiary mt-1">Add tasks manually. Automatic extraction from your transcripts is coming.</p>
    </div>
    <div class="flex-1"></div>

    <!-- Phase 3 match-my-energy control. Three-state energy selector +
         toggle for the sort. Sits in the header so it is always visible
         from any bucket / list context. -->
    <div class="flex items-center gap-2 mr-2">
      <span class="text-[10px] text-text-tertiary hidden sm:inline" aria-hidden="true">I feel</span>
      <div
        bind:this={energyRadioGroupEl}
        class="flex items-center gap-0.5 bg-bg-input border border-border-subtle rounded-lg p-0.5"
        role="radiogroup"
        aria-label="My current energy"
        tabindex="-1"
        onkeydown={energyRadioKeydown}
      >
        {#each energyOptions as opt}
          {@const checked = settings.currentEnergy === opt.value}
          <button
            class="text-[10px] px-2 py-0.5 rounded-md
              {checked
                ? 'bg-accent/25 text-accent border border-accent/30'
                : 'text-text-secondary hover:text-text'}"
            role="radio"
            aria-checked={checked}
            aria-label={opt.value ? `Set current energy to ${energyLabel(opt.value)}` : 'Clear current energy'}
            tabindex={checked ? 0 : -1}
            onclick={() => cycleCurrentEnergy(opt.value)}
          >{opt.label}</button>
        {/each}
      </div>
      <button
        class="flex items-center gap-1 btn-md rounded-lg text-[10px]
          {settings.matchMyEnergy
            ? 'bg-accent/25 text-accent border border-accent/30'
            : 'text-text-secondary hover:bg-hover hover:text-text border border-transparent'}"
        style="transition-duration: var(--duration-ui)"
        onclick={toggleMatchMyEnergy}
        aria-pressed={settings.matchMyEnergy}
        aria-label={settings.matchMyEnergy ? 'Match my energy is on — click to turn off' : 'Match my energy is off — click to turn on'}
        title="Sort matching tasks to the top (unset counts as Medium)"
      >
        <Zap size={12} aria-hidden="true" />
        Match my energy
      </button>
    </div>

    <button
      class="flex items-center gap-1.5 btn-md rounded-lg text-text-secondary hover:bg-hover hover:text-text"
      style="transition-duration: var(--duration-ui)"
      onclick={popOutTasks}
      aria-label="Pop out task window"
    >
      <ExternalLink size={14} aria-hidden="true" />
      Pop out
    </button>
  </div>

  <!-- Search -->
  <div class="px-7 pb-2">
    <div class="flex items-center gap-2 bg-bg-input border border-border rounded-lg px-3 py-1.5 focus-within:border-accent"
      style="transition-duration: var(--duration-ui)">
      <Search size={14} class="text-text-tertiary flex-shrink-0" aria-hidden="true" />
      <input
        type="text"
        class="flex-1 bg-transparent text-[12px] text-text placeholder:text-text-tertiary"
        placeholder="Search tasks..."
        bind:value={searchQuery}
        data-no-transition
      />
      {#if searchQuery}
        <button class="text-[10px] text-text-tertiary hover:text-text" onclick={() => searchQuery = ""}>Clear</button>
      {/if}
    </div>
  </div>

  <!-- Quick capture -->
  <div class="px-7 pb-3">
    <div class="flex items-center gap-2 bg-bg-input border border-border rounded-xl px-4 py-2.5 focus-within:border-accent"
      style="transition-duration: var(--duration-ui)">
      <Plus size={16} class="text-text-tertiary flex-shrink-0" aria-hidden="true" />
      <input
        type="text"
        class="flex-1 bg-transparent text-[13px] text-text placeholder:text-text-tertiary"
        placeholder="Add a task to {activeListName}{activeBucket !== 'all' ? ` (${activeBucket})` : ''}... (Enter to save)"
        bind:value={quickInput}
        onkeydown={handleQuickAdd}
      />
      {#if quickInput.trim()}
        <span class="text-[10px] text-text-tertiary px-1.5 py-0.5 rounded bg-bg-elevated border border-border-subtle">
          &rarr; {activeBucket === "all" ? "inbox" : activeBucket}
        </span>
      {/if}
    </div>
  </div>

  <!-- Bucket tabs + sort -->
  <div class="flex items-center gap-1 px-7 pb-3">
    <nav aria-label="Task filters">
    {#each buckets as bucket}
      <button
        class="flex items-center gap-1.5 btn-md rounded-lg
          {activeBucket === bucket.id
            ? 'bg-nav-active text-text font-medium'
            : 'text-text-secondary hover:bg-hover hover:text-text'}"
        style="transition-duration: var(--duration-ui)"
        onclick={() => activeBucket = bucket.id}
      >
        {bucket.label}
        {#if bucketCounts[bucket.id] > 0}
          <span class="text-[10px] px-1.5 py-0.5 rounded-full bg-bg-elevated text-text-tertiary">
            {bucketCounts[bucket.id]}
          </span>
        {/if}
      </button>
    {/each}
    </nav>

    <div class="flex-1"></div>

    <!-- Sort dropdown -->
    <div class="relative">
      <button
        class="flex items-center gap-1 px-2 py-1.5 rounded-lg text-[11px] text-text-tertiary hover:text-text-secondary hover:bg-hover"
        onclick={() => showSortMenu = !showSortMenu}
        aria-label="Sort tasks"
      >
        <ArrowUpDown size={14} aria-hidden="true" />
        {sortMode === "date" ? "" : sortMode === "quick-first" ? "Quick first" : "Deep first"}
      </button>
      {#if showSortMenu}
        <div class="absolute right-0 top-full mt-1 bg-bg-card border border-border rounded-lg shadow-lg py-1 z-20 animate-fade-in min-w-[120px]">
          {#each [["date", "By date"], ["quick-first", "Quick first"], ["deep-first", "Deep first"]] as [mode, label]}
            <button
              class="w-full text-left px-3 py-1 text-[11px] hover:bg-hover
                {sortMode === mode ? 'text-accent font-medium' : 'text-text-secondary hover:text-text'}"
              onclick={() => { sortMode = mode; showSortMenu = false; }}
            >{label}</button>
          {/each}
        </div>
      {/if}
    </div>
  </div>

  <!-- Main content: sidebar + tasks -->
  <div class="flex flex-1 min-h-0 px-7 pb-4 gap-3">
    <!--
      Layout-transition perf fix: was animating `width` directly. Now wraps
      the list sidebar in a CSS-grid container whose `grid-template-columns`
      track-size transitions between collapsed/expanded widths. Same visual
      effect, single transitioning property the browser can handle as a
      track-spec change rather than a width re-flow each frame.
    -->
    <!-- List sidebar -->
    <div
      class="grid {sidebarCollapsed ? 'grid-cols-[40px]' : 'grid-cols-[160px]'}"
      style="transition: grid-template-columns var(--duration-ui)"
    >
    <div
      class="flex flex-col bg-bg-elevated rounded-2xl border border-border-subtle overflow-hidden min-w-0"
    >
      <!-- Collapse toggle -->
      <button
        class="flex items-center justify-center h-[32px] text-text-tertiary hover:text-text-secondary border-b border-border-subtle"
        onclick={() => sidebarCollapsed = !sidebarCollapsed}
        aria-label={sidebarCollapsed ? "Expand list sidebar" : "Collapse list sidebar"}
      >
        {#if sidebarCollapsed}
          <ChevronRight size={12} aria-hidden="true" />
        {:else}
          <ChevronLeft size={12} aria-hidden="true" />
        {/if}
      </button>

      <!-- List items -->
      <div class="flex-1 overflow-y-auto py-1">
        {#each taskLists as list (list.id)}
          {#if editingListId === list.id && !sidebarCollapsed}
            <div class="px-1.5 py-0.5">
              <input
                bind:this={editingInputEl}
                type="text"
                class="w-full bg-bg-input border border-accent rounded px-2 py-1 text-[10px] text-text"
                bind:value={editingName}
                onkeydown={(e) => { if (e.key === "Enter") finishRenaming(); if (e.key === "Escape") { editingListId = null; } }}
                onblur={finishRenaming}
                data-no-transition
              />
            </div>
          {:else}
            <div class="relative">
              <button
                class="w-full flex items-center gap-1.5 px-2 py-1.5 text-left text-[11px]
                  {activeListId === list.id
                    ? 'border-l-2 border-accent text-text font-medium bg-accent/5'
                    : 'border-l-2 border-transparent text-text-secondary hover:bg-hover hover:text-text'}"
                onclick={() => { activeListId = list.id; contextMenuListId = null; }}
                ondblclick={() => { if (!list.builtIn && !sidebarCollapsed) startRenaming(list); }}
                oncontextmenu={(e) => { if (!list.builtIn) toggleContextMenu(e, list.id); }}
                title={sidebarCollapsed ? `${list.name} (${countForList(list.id)})` : ""}
              >
                {#if sidebarCollapsed}
                  <span class="text-[9px] px-1 py-0 rounded-full bg-bg-card text-text-tertiary min-w-[16px] text-center mx-auto">
                    {countForList(list.id)}
                  </span>
                {:else}
                  <span class="flex-1 truncate">{list.name}</span>
                  {#if countForList(list.id) > 0}
                    <span class="text-[9px] px-1 py-0 rounded-full bg-bg-card text-text-tertiary min-w-[16px] text-center">
                      {countForList(list.id)}
                    </span>
                  {/if}
                {/if}
              </button>

              <!-- Context menu -->
              {#if contextMenuListId === list.id && !sidebarCollapsed}
                <div class="absolute left-2 top-full mt-0.5 bg-bg-card border border-border rounded-lg shadow-lg py-1 z-20 animate-fade-in min-w-[100px]">
                  <button
                    class="w-full text-left px-3 py-1 text-[10px] text-text-secondary hover:bg-hover hover:text-text"
                    onclick={() => startRenaming(list)}
                  >Rename</button>
                  <div class="my-1 h-px bg-border-subtle"></div>
                  <button
                    class="w-full text-left px-3 py-1 text-[10px] text-danger hover:bg-hover"
                    onclick={() => handleDeleteList(list.id)}
                  >Delete</button>
                </div>
              {/if}
            </div>
          {/if}
        {/each}
      </div>

      <!-- New list -->
      {#if !sidebarCollapsed}
        <div class="px-2 py-2 border-t border-border-subtle">
          {#if showNewList}
            <input
              bind:this={newListInputEl}
              type="text"
              class="w-full bg-bg-input border border-border rounded px-2 py-1 text-[10px] text-text
                     placeholder:text-text-tertiary focus:border-accent"
              placeholder="List name..."
              bind:value={newListName}
              onkeydown={handleCreateList}
              onblur={() => { showNewList = false; newListName = ""; }}
              data-no-transition
            />
          {:else}
            <button
              class="w-full text-left text-[10px] text-accent hover:text-accent-hover px-1"
              onclick={() => showNewList = true}
            >+ New list</button>
          {/if}
        </div>
      {/if}
    </div>
    </div>

    <!-- Task list -->
    <div class="flex-1 overflow-y-auto min-h-0">
      {#if filteredTasks.length === 0}
        <EmptyState
          icon={SquareCheck}
          message={searchQuery
            ? "No matching tasks"
            : "Add tasks manually. Automatic extraction from your transcripts is coming."}
        />
      {:else}
        <div class="flex flex-col gap-1">
          {#each filteredTasks as task (task.id)}
            <div class="group flex items-start gap-3 p-3 rounded-xl bg-bg-card border border-border-subtle hover:border-border"
              style="transition-duration: var(--duration-ui)">
              <!-- Checkbox -->
              <button
                aria-label="Complete task"
                class="mt-0.5 w-[18px] h-[18px] rounded-md border-2 border-border-subtle hover:border-accent flex-shrink-0 flex items-center justify-center"
                style="transition-duration: var(--duration-ui)"
                onclick={() => completeTask(task.id)}
              ></button>

              <!-- Content -->
              <div class="flex-1 min-w-0">
                <p class="text-[13px] text-text leading-relaxed">{task.text}</p>
                <div class="flex items-center gap-2 mt-1.5">
                  <!-- Bucket pills -->
                  {#each taskBucketOptions as b}
                    <button
                      class="text-[10px] px-2 py-0.5 rounded-full border
                        {task.bucket === b
                          ? `${BUCKET_COLORS[b]} border-current bg-current/10 font-medium`
                          : 'text-text-tertiary border-transparent hover:border-border-subtle hover:text-text-secondary'}"
                      style="transition-duration: var(--duration-ui)"
                      onclick={() => setBucket(task.id, b)}
                    >{b}</button>
                  {/each}
                  <span class="text-border-subtle">&middot;</span>
                  <!-- Effort pills -->
                  {#each effortOptions as e}
                    <button
                      class="text-[10px] px-2 py-0.5 rounded-full border
                        {task.effort === e
                          ? 'text-accent border-accent/30 bg-accent/10 font-medium'
                          : 'text-text-tertiary border-transparent hover:border-border-subtle hover:text-text-secondary'}"
                      style="transition-duration: var(--duration-ui)"
                      onclick={() => setEffort(task.id, e)}
                    >{effortLabel(e)}</button>
                  {/each}
                  <span class="text-border-subtle">&middot;</span>
                  <!-- Energy chip (Phase 3) -->
                  <EnergyChip
                    energy={task.energy}
                    onSelect={(next) => setTaskEnergy(task.id, next)}
                    size="md"
                  />
                  <!-- Timestamp -->
                  {#if task.createdAt}
                    <span class="text-[10px] text-text-tertiary ml-auto">{formatTimestamp(task.createdAt)}</span>
                  {/if}
                </div>
                <!-- List name (only when viewing all lists) -->
                {#if activeListId === "all" && getListName(task.listId)}
                  <p class="text-[10px] text-text-tertiary italic mt-1">{getListName(task.listId)}</p>
                {/if}
              </div>

              <!-- Delete -->
              <button
                aria-label="Delete task"
                class="mt-0.5 text-text-tertiary hover:text-danger opacity-0 group-hover:opacity-100 focus:opacity-100"
                style="transition: opacity var(--duration-ui)"
                onclick={() => deleteTask(task.id)}
              >
                <X size={16} aria-hidden="true" />
              </button>
            </div>
          {/each}
        </div>
      {/if}

      <!-- Completed section -->
      {#if completedTasks.length > 0}
        <div class="mt-6">
          <button
            class="flex items-center gap-2 text-[12px] text-text-tertiary hover:text-text-secondary mb-2"
            onclick={() => showCompleted = !showCompleted}
          >
            <ChevronRight size={12} class={showCompleted ? "rotate-90" : ""} aria-hidden="true"
              style="transition: transform var(--duration-ui)" />
            Completed ({completedTasks.length})
          </button>
          {#if showCompleted}
            <div class="flex flex-col gap-1 animate-fade-in">
              {#each completedTasks as task (task.id)}
                <div class="group flex items-start gap-3 px-4 py-2.5 rounded-xl opacity-50 hover:opacity-70"
                  style="transition: opacity var(--duration-ui)">
                  <button
                    aria-label="Uncomplete task"
                    class="mt-0.5 w-[18px] h-[18px] rounded-md border-2 border-accent bg-accent/20 flex-shrink-0 flex items-center justify-center"
                    onclick={() => uncompleteTask(task.id)}
                  >
                    <SquareCheck size={12} class="text-accent" aria-hidden="true" />
                  </button>
                  <div class="flex-1 min-w-0">
                    <p class="text-[13px] text-text-secondary line-through">{task.text}</p>
                    {#if task.doneAt}
                      <p class="text-[10px] text-text-tertiary mt-0.5">Completed {formatTimestamp(task.doneAt)}</p>
                    {/if}
                  </div>
                  <button
                    aria-label="Delete completed task"
                    class="mt-0.5 text-text-tertiary hover:text-danger opacity-0 group-hover:opacity-100 focus:opacity-100"
                    style="transition: opacity var(--duration-ui)"
                    onclick={() => deleteTask(task.id)}
                  >
                    <X size={16} aria-hidden="true" />
                  </button>
                </div>
              {/each}
            </div>
          {/if}
        </div>
      {/if}
    </div>
  </div>
</div>

<style>
  /* Phase 9 polish: gentle entrance animation when the today-count
     badge mounts (it is conditionally rendered, so each new render
     re-fires the animation). prefers-reduced-motion disables. */
  :global(.badge-today) {
    animation: badge-pop 180ms ease both;
  }
  @media (prefers-reduced-motion: reduce) {
    :global(.badge-today) {
      animation: none;
    }
  }
  @keyframes badge-pop {
    from {
      opacity: 0;
      transform: translateY(2px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
</style>
