import { api } from '../../lib/api.mjs';

const CODE_TYPES = [
  { key: 'gl_account',  label: 'GL Account Code',          placeholder: 'e.g. 6100-Operations' },
  { key: 'cost_center', label: 'Cost Center / Department',  placeholder: 'e.g. CC-4200' },
  { key: 'wbs',         label: 'Project WBS / Phase',       placeholder: 'e.g. P-1234-A' },
  { key: 'billing_ref', label: 'Billing Reference',         placeholder: 'e.g. INV-2024-001' },
];

class WoAccounting extends HTMLElement {
  #woId    = null;
  #codes   = {};
  #saving  = false;
  #loading = true;

  static get observedAttributes() { return ['wo-id']; }

  connectedCallback() {
    if (!this.shadowRoot) this.attachShadow({ mode: 'open' });
    if (this.#woId) this.#load();
  }

  attributeChangedCallback(_, __, val) {
    this.#woId = val ? +val : null;
    if (this.shadowRoot && this.#woId) this.#load();
  }

  async #load() {
    this.#loading = true;
    this.#render();
    try {
      const rows = await api.get(`/work-orders/${this.#woId}/accounting`) || [];
      this.#codes = {};
      rows.forEach(r => { this.#codes[r.code_type] = { value: r.code_value, description: r.description }; });
    } catch { this.#codes = {}; }
    this.#loading = false;
    this.#render();
  }

  async #save() {
    if (this.#saving) return;
    this.#saving = true;
    this.#updateSaveIndicator('saving');
    try {
      const s = this.shadowRoot;
      const payload = CODE_TYPES
        .filter(ct => {
          const v = s.querySelector(`[data-key="${ct.key}"] .code-value`)?.value?.trim();
          return v;
        })
        .map(ct => ({
          code_type:   ct.key,
          code_value:  s.querySelector(`[data-key="${ct.key}"] .code-value`).value.trim(),
          description: s.querySelector(`[data-key="${ct.key}"] .code-desc`).value.trim(),
        }));
      await api.put(`/work-orders/${this.#woId}/accounting`, payload);
      this.#updateSaveIndicator('saved');
    } catch (err) {
      this.#updateSaveIndicator('error');
      window.dispatchEvent(new CustomEvent('wo:toast', { detail: { message: err.message, type: 'error' } }));
    } finally {
      this.#saving = false;
    }
  }

  #updateSaveIndicator(state) {
    const el = this.shadowRoot?.querySelector('#save-indicator');
    if (!el) return;
    const msgs = { saving: '⋯ Saving…', saved: '✓ Saved', error: '✗ Error' };
    const colors = { saving: 'var(--text-muted)', saved: 'var(--success)', error: 'var(--danger)' };
    el.textContent = msgs[state];
    el.style.color = colors[state];
    if (state !== 'saving') setTimeout(() => { if (el) el.textContent = ''; }, 2500);
  }

  #render() {
    const s = this.shadowRoot;
    if (this.#loading) {
      s.innerHTML = `<style>:host{display:block;padding:2rem;text-align:center}</style><ui-spinner></ui-spinner>`;
      return;
    }

    s.innerHTML = `
      <style>
        :host { display: block; }
        .header-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; }
        .section-title { font-size: .813rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; }
        #save-indicator { font-size: .813rem; font-weight: 500; transition: color .2s; }
        .code-grid { display: flex; flex-direction: column; gap: 1rem; }
        .code-row { display: grid; grid-template-columns: 1fr 1.5fr; gap: .75rem; align-items: start; }
        .code-label { font-size: .813rem; font-weight: 600; color: var(--text); padding-top: .55rem; }
        .code-inputs { display: flex; flex-direction: column; gap: .4rem; }
        .code-value, .code-desc { width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .5rem .75rem; font-size: .875rem; background: var(--surface); color: var(--text); transition: border-color .15s; box-sizing: border-box; }
        .code-value:focus, .code-desc:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(10,126,164,.12); }
        .code-desc { font-size: .813rem; color: var(--text-muted); }
        .code-desc::placeholder { font-style: italic; }
        .divider { height: 1px; background: var(--border-lt); }
        @media (max-width: 768px) { .code-row { grid-template-columns: 1fr; } }
      </style>
      <div class="header-row">
        <span class="section-title">Accounting Codes</span>
        <span id="save-indicator"></span>
      </div>
      <div class="code-grid">
        ${CODE_TYPES.map((ct, i) => `
          ${i > 0 ? '<div class="divider"></div>' : ''}
          <div class="code-row" data-key="${ct.key}">
            <div class="code-label">${ct.label}</div>
            <div class="code-inputs">
              <input class="code-value" placeholder="${ct.placeholder}" value="${this.#esc(this.#codes[ct.key]?.value || '')}">
              <input class="code-desc"  placeholder="Description…"     value="${this.#esc(this.#codes[ct.key]?.description || '')}">
            </div>
          </div>`).join('')}
      </div>`;

    s.querySelectorAll('.code-value, .code-desc').forEach(input => {
      input.addEventListener('blur', () => this.#save());
      input.addEventListener('keydown', e => { if (e.key === 'Enter') input.blur(); });
    });
  }

  #esc(s) { return (s || '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }
}

customElements.define('wo-accounting', WoAccounting);