// assets/scripts/stopwatch.js

import { esc, createTranslator } from './utils.js';

const LS_KEY = 'tt_timer_state';
const LAST_PROJECT_KEY = 'tt_last_project_id';
const LAST_SERVICE_KEY = 'tt_last_service_id';

const t = createTranslator('STOPWATCH');

const STOPWATCH_SVG = `<svg viewBox="0 0 16 16" fill="none"><circle cx="8" cy="9" r="5.5" stroke="currentColor" stroke-width="1.3"/><path d="M8 6v3.5l2 1.5" stroke="currentColor" stroke-width="1.3" stroke-linecap="round" stroke-linejoin="round"/><path d="M6.5 1.5h3" stroke="currentColor" stroke-width="1.3" stroke-linecap="round"/><path d="M8 1.5v2" stroke="currentColor" stroke-width="1.3" stroke-linecap="round"/><path d="M12.5 4.5l1-1" stroke="currentColor" stroke-width="1.3" stroke-linecap="round"/></svg>`;

function buildEntryLabel(entry) {
  if (!entry) return '';
  let label = `${entry.projectName} (${entry.clientName})`;
  if (entry.serviceName) label += ` – ${entry.serviceName}`;
  return label;
}

async function apiCall(url, options = {}) {
  const res = await fetch(url, options);
  const ct = res.headers.get('content-type') || '';
  if (!ct.includes('application/json')) {
    console.error(`[Stopwatch] ${url} returned non-JSON:`, res.status, ct);
    return { ok: false, status: res.status, data: null };
  }
  const data = await res.json();
  return { ok: res.ok, status: res.status, data };
}

// ── Searchable Select ─────────────────────────────────────────────────────────

class SearchableSelect {
  constructor(container) {
    this.container = container;
    this.value = '';
    this.label = '';
    this.groups = [];
    this.open = false;
    this.highlightIdx = -1;
    this.placeholder = container.dataset.placeholder || '...';

    this.container.innerHTML = `
      <button type="button" class="ss__trigger">
        <span class="ss__value">${esc(this.placeholder)}</span>
        <svg class="ss__arrow" viewBox="0 0 10 6"><path d="M1 1l4 4 4-4" stroke="currentColor" stroke-width="1.3" fill="none" stroke-linecap="round"/></svg>
      </button>
      <div class="ss__dropdown" hidden>
        <input type="text" class="ss__search" placeholder="${esc(t('search'))}">
        <div class="ss__list"></div>
      </div>`;

    this.trigger  = container.querySelector('.ss__trigger');
    this.valueEl  = container.querySelector('.ss__value');
    this.dropdown = container.querySelector('.ss__dropdown');
    this.search   = container.querySelector('.ss__search');
    this.list     = container.querySelector('.ss__list');

    this.trigger.addEventListener('click', (e) => {
      e.stopPropagation();
      this.toggle();
    });
    this.search.addEventListener('input', () => this.render());
    this.search.addEventListener('keydown', (e) => this.onKeydown(e));
    this.list.addEventListener('click', (e) => {
      const item = e.target.closest('[data-value]');
      if (item) this.select(item.dataset.value, item.dataset.label);
    });
    document.addEventListener('click', (e) => {
      if (this.open && !this.container.contains(e.target)) this.close();
    });
  }

  setGroups(groups) {
    this.groups = groups;
  }

  setValue(val) {
    for (const g of this.groups) {
      for (const item of g.items) {
        if (String(item.id) === String(val)) {
          this.value = String(item.id);
          this.label = item.name;
          this.valueEl.textContent = item.name;
          this.valueEl.classList.add('ss__value--selected');
          return;
        }
      }
    }
    this.value = '';
    this.label = '';
    this.valueEl.textContent = this.placeholder;
    this.valueEl.classList.remove('ss__value--selected');
  }

  getValue() { return this.value; }

  toggle() {
    this.open ? this.close() : this.openDropdown();
  }

  openDropdown() {
    this.open = true;
    this.dropdown.hidden = false;
    this.search.value = '';
    this.highlightIdx = -1;
    this.render();
    this.search.focus();
  }

  close() {
    this.open = false;
    this.dropdown.hidden = true;
  }

  select(val, label) {
    this.value = val;
    this.label = label;
    this.valueEl.textContent = label;
    this.valueEl.classList.add('ss__value--selected');
    this.close();
  }

  focus() {
    this.openDropdown();
  }

  render() {
    const q = this.search.value.toLowerCase().trim();
    let html = '';
    let idx = 0;
    const visibleItems = [];

    for (const g of this.groups) {
      const filtered = g.items.filter(item =>
        !q || item.name.toLowerCase().includes(q) || g.label.toLowerCase().includes(q)
      );
      if (!filtered.length) continue;

      html += `<div class="ss__group">${esc(g.label)}</div>`;
      for (const item of filtered) {
        const active = String(item.id) === this.value ? ' ss__item--active' : '';
        const hl = idx === this.highlightIdx ? ' ss__item--highlight' : '';
        html += `<div class="ss__item${active}${hl}" data-value="${item.id}" data-label="${esc(item.name)}" data-idx="${idx}">${esc(item.name)}</div>`;
        visibleItems.push(item);
        idx++;
      }
    }

    this.list.innerHTML = html || `<div class="ss__empty">–</div>`;
    this.visibleCount = visibleItems.length;
  }

  onKeydown(e) {
    if (e.key === 'ArrowDown') {
      e.preventDefault();
      this.highlightIdx = Math.min(this.highlightIdx + 1, this.visibleCount - 1);
      this.render();
      this.scrollToHighlight();
    } else if (e.key === 'ArrowUp') {
      e.preventDefault();
      this.highlightIdx = Math.max(this.highlightIdx - 1, 0);
      this.render();
      this.scrollToHighlight();
    } else if (e.key === 'Enter') {
      e.preventDefault();
      const el = this.list.querySelector(`[data-idx="${this.highlightIdx}"]`);
      if (el) this.select(el.dataset.value, el.dataset.label);
    } else if (e.key === 'Escape') {
      this.close();
    }
  }

  scrollToHighlight() {
    const el = this.list.querySelector('.ss__item--highlight');
    if (el) el.scrollIntoView({ block: 'nearest' });
  }
}

// ── StopwatchManager ──────────────────────────────────────────────────────────

class StopwatchManager {
  constructor() {
    this.toggle       = document.getElementById('stopwatch-toggle');
    this.popover      = document.getElementById('stopwatch-popover');
    this.display      = document.getElementById('stopwatch-display');
    this.startBtn     = document.getElementById('stopwatch-start');
    this.noteField    = document.getElementById('stopwatch-note');
    this.hamburgerBtn = document.getElementById('hamburger-stopwatch');
    this.headerTime   = document.getElementById('stopwatch-header-time');

    this.projectSelect = null;
    this.serviceSelect = null;
    const projEl = document.getElementById('stopwatch-project');
    const svcEl  = document.getElementById('stopwatch-service');
    if (projEl) this.projectSelect = new SearchableSelect(projEl);
    if (svcEl)  this.serviceSelect = new SearchableSelect(svcEl);

    this.running       = false;
    this.entryId       = null;
    this.startedAt     = null;
    this.baseDuration  = 0;
    this.entryLabel    = '';
    this.tickInterval  = null;
    this.originalTitle = document.title;
    this.cachedOptions = null;
    this.busy          = false;

    if (!this.toggle) return;
    this.init();
  }

  async init() {
    this.toggle.addEventListener('click', (e) => {
      e.stopPropagation();
      this.handleToggleClick();
    });

    this.startBtn?.addEventListener('click', () => this.startNew());

    document.addEventListener('click', (e) => {
      if (this.popover && !this.popover.hidden
          && !this.popover.contains(e.target)
          && !this.toggle.contains(e.target)) {
        this.closePopover();
      }
    });

    this.hamburgerBtn?.addEventListener('click', () => this.handleToggleClick());

    this.loadFromLocalStorage();
    await this.loadStatus();
  }

  // ── Toggle ──────────────────────────────────────────────────────────────────

  handleToggleClick() {
    if (this.running) {
      this.stop();
    } else {
      this.togglePopover();
    }
  }

  async togglePopover() {
    if (!this.popover) return;

    if (!this.popover.hidden) {
      this.closePopover();
      return;
    }

    await this.loadOptions();
    this.populateSelects();
    this.popover.hidden = false;
    this.toggle.setAttribute('aria-expanded', 'true');
    this.projectSelect?.focus();
  }

  closePopover() {
    if (!this.popover) return;
    this.popover.hidden = true;
    this.toggle.setAttribute('aria-expanded', 'false');
    this.projectSelect?.close();
    this.serviceSelect?.close();
  }

  // ── Select-Builder ──────────────────────────────────────────────────────────

  populateSelects() {
    if (!this.cachedOptions) return;

    const lastProject = localStorage.getItem(LAST_PROJECT_KEY);
    const lastService = localStorage.getItem(LAST_SERVICE_KEY);

    if (this.projectSelect) {
      const groups = {};
      (this.cachedOptions.projects ?? []).forEach(p => {
        if (!groups[p.clientName]) groups[p.clientName] = [];
        groups[p.clientName].push(p);
      });
      this.projectSelect.setGroups(
        Object.entries(groups).map(([label, items]) => ({ label, items }))
      );
      if (lastProject) this.projectSelect.setValue(lastProject);
    }

    if (this.serviceSelect) {
      const billable    = (this.cachedOptions.services ?? []).filter(s => s.billable);
      const notBillable = (this.cachedOptions.services ?? []).filter(s => !s.billable);
      const groups = [];
      if (billable.length)    groups.push({ label: t('billable'),    items: billable });
      if (notBillable.length) groups.push({ label: t('notBillable'), items: notBillable });
      this.serviceSelect.setGroups(groups);
      if (lastService) this.serviceSelect.setValue(lastService);
    }
  }

  // ── API ─────────────────────────────────────────────────────────────────────

  async loadStatus() {
    try {
      const { ok, data } = await apiCall('/api/timer/status');
      if (!ok || !data) {
        if (this.running) {
          this.running = false;
          this.clearLocalStorage();
          this.applyStoppedState();
        }
        return;
      }

      if (data.running && data.startedAt) {
        this.running      = true;
        this.entryId      = data.entry?.id ?? null;
        this.startedAt    = new Date(data.startedAt).getTime();
        this.baseDuration = data.entry?.duration ?? 0;
        this.entryLabel   = buildEntryLabel(data.entry);
        this.saveToLocalStorage();
        this.applyRunningState();
      } else if (this.running) {
        this.running = false;
        this.clearLocalStorage();
        this.applyStoppedState();
      }
    } catch {
      if (this.running) {
        this.running = false;
        this.clearLocalStorage();
        this.applyStoppedState();
      }
    }
  }

  async loadOptions() {
    if (this.cachedOptions) return;
    try {
      const { ok, data } = await apiCall('/api/timer/options');
      if (ok && data) this.cachedOptions = data;
    } catch { /* silent */ }
  }

  async startNew() {
    if (this.busy) return;

    const projectId = this.projectSelect?.getValue();
    if (!projectId) {
      this.projectSelect?.focus();
      return;
    }

    this.busy = true;
    this.startBtn.disabled = true;

    try {
      const serviceId = this.serviceSelect?.getValue();

      const { ok, status, data } = await apiCall('/api/timer/start', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          projectId: parseInt(projectId, 10),
          serviceId: serviceId ? parseInt(serviceId, 10) : null,
          note: this.noteField?.value || null,
        }),
      });

      if (status === 409 && data) {
        const name = data.runningEntry
          ? `${data.runningEntry.clientName} / ${data.runningEntry.projectName}`
          : '';
        const msg = t('confirmReplace').replace('%project%', name);
        if (!confirm(msg)) return;

        await this.forceStop();
        this.busy = false;
        return this.startNew();
      }

      if (!ok) {
        alert(t('errorStart') + (data?.error ? `\n${data.error}` : ` (HTTP ${status})`));
        return;
      }

      this.running      = true;
      this.entryId      = data.entry.id;
      this.startedAt    = new Date(data.entry.timerStartedAt).getTime();
      this.baseDuration = data.entry.duration;
      this.entryLabel   = buildEntryLabel(data.entry);

      this.saveToLocalStorage();
      this.applyRunningState();
      this.closePopover();

      if (projectId) localStorage.setItem(LAST_PROJECT_KEY, projectId);
      if (serviceId) localStorage.setItem(LAST_SERVICE_KEY, serviceId);

      try {
        this.addEntryToDOM(data.entry, data.totalDuration);
      } catch (domEx) {
        console.error('[Stopwatch] addEntryToDOM error (non-fatal):', domEx);
      }
    } catch (ex) {
      console.error('[Stopwatch] startNew error:', ex);
      alert(t('errorStart') + `\n${ex.message}`);
    } finally {
      this.busy = false;
      if (this.startBtn) this.startBtn.disabled = false;
    }
  }

  async resumeEntry(entryId) {
    if (this.busy) return;
    if (this.running && this.entryId === entryId) {
      this.stop();
      return;
    }

    this.busy = true;

    try {
      const { ok, status, data } = await apiCall(`/api/timer/start/${entryId}`, {
        method: 'POST',
      });

      if (status === 409 && data) {
        const name = data.runningEntry
          ? `${data.runningEntry.clientName} / ${data.runningEntry.projectName}`
          : '';
        const msg = t('confirmReplace').replace('%project%', name);
        if (!confirm(msg)) return;

        await this.forceStop();
        this.busy = false;
        return this.resumeEntry(entryId);
      }

      if (!ok) {
        alert(t('errorStart') + (data?.error ? `\n${data.error}` : ` (HTTP ${status})`));
        return;
      }

      this.running      = true;
      this.entryId      = data.entry.id;
      this.startedAt    = new Date(data.entry.timerStartedAt).getTime();
      this.baseDuration = data.entry.duration;
      this.entryLabel   = buildEntryLabel(data.entry);

      this.saveToLocalStorage();
      this.applyRunningState();
    } catch (ex) {
      console.error('[Stopwatch] resumeEntry error:', ex);
      alert(t('errorStart') + `\n${ex.message}`);
    } finally {
      this.busy = false;
    }
  }

  async stop() {
    if (this.busy) return;
    this.busy = true;

    try {
      const { ok, status, data } = await apiCall('/api/timer/stop', { method: 'POST' });

      if (!ok) {
        alert(t('errorStop') + (data?.error ? `\n${data.error}` : ` (HTTP ${status})`));
        if (status === 404) {
          this.running = false;
          this.clearLocalStorage();
          this.applyStoppedState();
        }
        return;
      }

      const stoppedEntryId = this.entryId;
      this.running = false;
      this.clearLocalStorage();
      this.applyStoppedState();

      try {
        this.updateEntryInDOM(stoppedEntryId, data.entry, data.totalDuration);
      } catch (domEx) {
        console.error('[Stopwatch] updateEntryInDOM error (non-fatal):', domEx);
      }
    } catch (ex) {
      console.error('[Stopwatch] stop error:', ex);
      alert(t('errorStop') + `\n${ex.message}`);
    } finally {
      this.busy = false;
    }
  }

  async forceStop() {
    try {
      const stoppedId = this.entryId;
      const { ok, data } = await apiCall('/api/timer/stop', { method: 'POST' });
      if (!ok) return;
      this.running = false;
      this.clearLocalStorage();
      this.applyStoppedState();
      try {
        this.updateEntryInDOM(stoppedId, data.entry, data.totalDuration);
      } catch { /* silent */ }
    } catch { /* silent */ }
  }

  // ── Timer-Tick ──────────────────────────────────────────────────────────────

  startTicking() {
    if (this.tickInterval) return;
    this.tick();
    this.tickInterval = setInterval(() => this.tick(), 1000);
  }

  stopTicking() {
    if (this.tickInterval) {
      clearInterval(this.tickInterval);
      this.tickInterval = null;
    }
    document.title = this.originalTitle;
    if (this.display) this.display.textContent = '0:00';
    if (this.headerTime) {
      this.headerTime.textContent = '';
      this.headerTime.hidden = true;
    }
  }

  tick() {
    if (!this.startedAt) return;
    const elapsedSec = Math.floor((Date.now() - this.startedAt) / 1000);
    const totalSec = (this.baseDuration * 60) + elapsedSec;

    const h = Math.floor(totalSec / 3600);
    const m = Math.floor((totalSec % 3600) / 60);
    const s = totalSec % 60;

    const long = h > 0
      ? `${h}:${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`
      : `${m}:${String(s).padStart(2, '0')}`;

    const short = `${h}:${String(m).padStart(2, '0')}`;

    document.title = `${short} - ${this.originalTitle}`;
    if (this.display) this.display.textContent = long;

    if (this.headerTime) {
      this.headerTime.textContent = short;
      this.headerTime.hidden = false;
    }

    if (this.entryId) {
      const badge = document.querySelector(`#entry-${this.entryId} .entry-row__badge`);
      if (badge) badge.textContent = short;
    }
  }

  // ── Visual State ────────────────────────────────────────────────────────────

  applyRunningState() {
    this.toggle?.classList.add('main-nav__stopwatch--running');
    this.hamburgerBtn?.classList.add('hamburger-nav__stopwatch--running');
    if (this.toggle && this.entryLabel) this.toggle.title = this.entryLabel;
    this.startTicking();
    this.markActiveEntryRow();
  }

  applyStoppedState() {
    this.toggle?.classList.remove('main-nav__stopwatch--running');
    this.hamburgerBtn?.classList.remove('hamburger-nav__stopwatch--running');
    if (this.toggle) this.toggle.title = t('title');
    this.stopTicking();
    this.entryId      = null;
    this.startedAt    = null;
    this.baseDuration = 0;
    this.entryLabel   = '';
    this.clearActiveEntryRows();
  }

  markActiveEntryRow() {
    this.clearActiveEntryRows();
    if (!this.entryId) return;
    const row = document.getElementById(`entry-${this.entryId}`);
    if (row) row.classList.add('entry-row--timer-active');
  }

  clearActiveEntryRows() {
    document.querySelectorAll('.entry-row--timer-active')
      .forEach(el => el.classList.remove('entry-row--timer-active'));
  }

  // ── DOM Integration ─────────────────────────────────────────────────────────

  addEntryToDOM(entry, totalDuration) {
    if (!window.entryManager) return;
    window.entryManager.addEntryToDOM(entry);
    if (totalDuration) window.entryManager.updateTotal(totalDuration);
    this.markActiveEntryRow();
  }

  updateEntryInDOM(entryId, entry, totalDuration) {
    if (!window.entryManager || !entryId) return;
    const row = document.getElementById(`entry-${entryId}`);
    if (row) {
      window.entryManager.updateRowDisplay(row, entry);
      row.dataset.duration = entry.duration;
    }
    if (totalDuration) window.entryManager.updateTotal(totalDuration);
  }

  // ── LocalStorage ────────────────────────────────────────────────────────────

  saveToLocalStorage() {
    try {
      localStorage.setItem(LS_KEY, JSON.stringify({
        entryId:      this.entryId,
        startedAt:    this.startedAt,
        baseDuration: this.baseDuration,
        entryLabel:   this.entryLabel,
      }));
    } catch { /* silent */ }
  }

  loadFromLocalStorage() {
    try {
      const raw = localStorage.getItem(LS_KEY);
      if (!raw) return;
      const data = JSON.parse(raw);
      if (data?.startedAt) {
        this.running      = true;
        this.entryId      = data.entryId;
        this.startedAt    = data.startedAt;
        this.baseDuration = data.baseDuration ?? 0;
        this.entryLabel   = data.entryLabel ?? '';
        this.applyRunningState();
      }
    } catch { /* silent */ }
  }

  clearLocalStorage() {
    try { localStorage.removeItem(LS_KEY); } catch { /* silent */ }
  }

  // ── Public ─────────────────────────────────────────────────────────────────

  static get SVG() { return STOPWATCH_SVG; }

  isRunningForEntry(entryId) {
    return this.running && this.entryId === entryId;
  }
}

window.stopwatchManager = null;
document.addEventListener('DOMContentLoaded', () => {
  window.stopwatchManager = new StopwatchManager();
});

export { STOPWATCH_SVG };