/* Shared project layer for the Work Package Suite.
   Projects are the top-level container — every SOP and Work Package belongs to
   one. Project records live in the SQL database (via /api/projects); this
   adapter is API-first and falls back to a localStorage mirror so the suite
   still works in local dev / offline. Included by the home page and the suite. */
(function (global) {
  'use strict';

  var API = '/api';
  var LS_PROJECTS = 'wp_projects';        // local mirror of the project list
  var LS_ACTIVE = 'wp_active_project';    // active project id
  var LS_ACTIVE_OBJ = 'wp_active_project_obj';

  function uid() { return 'proj_' + Date.now().toString(36) + Math.random().toString(36).slice(2, 6); }
  function esc(v) { return v == null ? '' : String(v).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;'); }

  function readLocal() { try { return JSON.parse(localStorage.getItem(LS_PROJECTS) || '[]') || []; } catch (e) { return []; } }
  function writeLocal(list) { try { localStorage.setItem(LS_PROJECTS, JSON.stringify(list)); } catch (e) {} }
  function cacheUpsert(p) {
    var list = readLocal();
    var ix = list.findIndex(function (x) { return x.id === p.id; });
    if (ix >= 0) list[ix] = p; else list.unshift(p);
    writeLocal(list);
  }
  function cacheRemove(id) { writeLocal(readLocal().filter(function (x) { return x.id !== id; })); }

  var SAMPLE_PROJECT = {
    name: 'Micron FMCS Install (sample)', number: '26-67-008',
    client: 'Micron Technology, Inc.', division: 'Semiconductor',
    site: 'Boise, ID — Fab', sample: true
  };

  var ProjectData = {
    SAMPLE: SAMPLE_PROJECT,
    esc: esc,

    // Returns the project list. Tries the API; falls back to the local mirror.
    list: function () {
      return fetch(API + '/projects', { headers: { 'Accept': 'application/json' } })
        .then(function (r) { if (!r.ok) throw 0; return r.json(); })
        .then(function (rows) { writeLocal(rows); return rows; })
        .catch(function () { return readLocal(); });
    },

    get: function (id) {
      return fetch(API + '/projects/' + encodeURIComponent(id))
        .then(function (r) { if (!r.ok) throw 0; return r.json(); })
        .catch(function () { return readLocal().find(function (x) { return x.id === id; }) || null; });
    },

    // Create or update. Assigns an id when new. Mirrors to localStorage either way.
    save: function (p) {
      if (!p.id) p.id = uid();
      return fetch(API + '/projects', {
        method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(p)
      })
        .then(function (r) { if (!r.ok) throw 0; return r.json(); })
        .then(function (saved) { cacheUpsert(saved); return saved; })
        .catch(function () { cacheUpsert(p); return p; });   // offline / no API → local only
    },

    remove: function (id) {
      return fetch(API + '/projects/' + encodeURIComponent(id), { method: 'DELETE' })
        .then(function () { cacheRemove(id); })
        .catch(function () { cacheRemove(id); });
    },

    // ── active project context ────────────────────────────────────────────────
    getActiveId: function () { try { return localStorage.getItem(LS_ACTIVE) || ''; } catch (e) { return ''; } },
    getActive: function () { try { return JSON.parse(localStorage.getItem(LS_ACTIVE_OBJ) || 'null'); } catch (e) { return null; } },
    setActive: function (p) {
      try {
        if (p) { localStorage.setItem(LS_ACTIVE, p.id); localStorage.setItem(LS_ACTIVE_OBJ, JSON.stringify(p)); }
        else { localStorage.removeItem(LS_ACTIVE); localStorage.removeItem(LS_ACTIVE_OBJ); }
      } catch (e) {}
    },

    // Per-project namespacing for the SOP/WP localStorage keys, e.g.
    //   key('wp_iwp_v1')  → 'wp_iwp_v1__proj_ab12'
    // Falls back to the bare key when no project is active.
    key: function (base) { var id = this.getActiveId(); return id ? base + '__' + id : base; }
  };

  // ── Server sync for SOPs and Work Packages ─────────────────────────────────
  // SOPs and WPs are authoritative on the server (so every user of a project sees
  // the same data). To avoid rewriting the two apps, we keep their existing
  // localStorage keys as a per-browser CACHE: pullProject() hydrates those exact
  // keys from the API on page load, and the push* helpers write through to the
  // API whenever the apps save. The apps' own (synchronous) reads are unchanged.
  function nsKey(base, id) { return id ? base + '__' + id : base; }
  function currentUser() {
    try { return (window.WP_USER && (window.WP_USER.username || window.WP_USER.full_name)) || ''; } catch (e) { return ''; }
  }

  // A saved Work Package is a flat object in the browser; the API splits it into
  // promoted columns + a `data` blob. We store the whole flat object in `data`
  // for perfect round-tripping, and mirror the few fields the API promotes.
  function pkgToServer(p, projectId) {
    return {
      id: p.id,
      project_id: p.projectId || projectId || null,
      parent_id: p.instanceOf || null,
      number: p.number || '',
      subject: p.subject || '',
      type: p.type || '',
      status: p.status || 'Draft',
      created_by: p.createdBy || currentUser(),
      data: p
    };
  }
  function serverToPkg(row) {
    var p = Object.assign({}, row.data || {});   // full flat object lives in data
    p.id = row.id;
    p.projectId = row.project_id || p.projectId || '';
    if (row.number) p.number = row.number;
    if (row.subject != null) p.subject = row.subject;
    if (row.type != null) p.type = row.type;
    if (row.status) p.status = row.status;        // honor server-side status changes
    if (row.parent_id) p.instanceOf = row.parent_id;
    return p;
  }

  // Pull this project's SOP + WPs from the API into the localStorage keys the
  // apps read. Resolves even on failure (offline / no API) so boot continues.
  ProjectData.pullProject = function (projectId) {
    if (!projectId) return Promise.resolve();
    var jobs = [];
    jobs.push(
      fetch(API + '/sops/latest?complete=true&project_id=' + encodeURIComponent(projectId), { headers: { 'Accept': 'application/json' } })
        .then(function (r) { return r.ok ? r.json() : null; })
        .then(function (sopRow) {
          if (sopRow && sopRow.data) {
            var d = sopRow.data;   // { sop, state } as written by pushSOP
            if (d.sop) localStorage.setItem(nsKey('wp_suite_sop', projectId), JSON.stringify(d.sop));
            if (d.state) localStorage.setItem(nsKey('wp_suite_state', projectId), JSON.stringify(d.state));
            localStorage.setItem(nsKey('wp_suite_sop_complete', projectId), '1');
          }
        }).catch(function () {})
    );
    jobs.push(
      fetch(API + '/wps?full=true&project_id=' + encodeURIComponent(projectId), { headers: { 'Accept': 'application/json' } })
        .then(function (r) { return r.ok ? r.json() : null; })
        .then(function (rows) {
          if (Array.isArray(rows)) {
            localStorage.setItem(nsKey('wp_iwp_v1', projectId), JSON.stringify(rows.map(serverToPkg)));
          }
        }).catch(function () {})
    );
    return Promise.all(jobs).then(function () {});
  };

  // Write a completed SOP (plus the builder's raw state) to the API. Uses a
  // deterministic id per project so re-completing updates the same row.
  ProjectData.pushSOP = function (projectId, sop, state) {
    if (!projectId) return Promise.resolve(null);
    var body = {
      id: 'sop__' + projectId,
      project_id: projectId,
      name: (sop && sop.project && sop.project.name) || 'SOP',
      number: (sop && sop.project && sop.project.number) || '',
      complete: true,
      created_by: currentUser(),
      data: { sop: sop, state: state }
    };
    return fetch(API + '/sops', {
      method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body)
    }).then(function (r) { return r.ok ? r.json() : null; }).catch(function () { return null; });
  };

  // Upsert a single Work Package to the API (fire-and-forget from the caller's
  // perspective; the local cache is the source of truth for immediate rendering).
  ProjectData.pushWP = function (p, projectId) {
    if (!p || !p.id) return Promise.resolve(null);
    return fetch(API + '/wps', {
      method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(pkgToServer(p, projectId))
    }).then(function (r) { return r.ok ? r.json() : null; }).catch(function () { return null; });
  };

  ProjectData.removeWP = function (id) {
    if (!id) return Promise.resolve();
    return fetch(API + '/wps/' + encodeURIComponent(id), { method: 'DELETE' })
      .then(function () {}).catch(function () {});
  };

  // One-time discard of pre-multi-project (un-namespaced) SOP/WP data so stale
  // global state can't leak across projects. (User chose: discard, don't migrate.)
  try {
    if (!localStorage.getItem('wp_ns_migrated_v1')) {
      ['wp_suite_sop', 'wp_suite_state', 'wp_suite_sop_complete', 'wp_iwp_v1'].forEach(function (k) {
        try { localStorage.removeItem(k); } catch (e) {}
      });
      localStorage.setItem('wp_ns_migrated_v1', '1');
    }
  } catch (e) {}

  global.ProjectData = ProjectData;
})(window);