// «Crea ricetta da DXF» dell'editor task (#83): da un'immagine della camera e un DXF
// genera la ricetta dxf_compare (POST /maker/api/vision/tasks/<id>/recipe/dxf-compare).
// «Prova» (save=false) mostra overlay e quattro valori, «Salva ricetta» (save=true)
// la scrive e avvisa il componente visionRecipe con l'evento 'dxf-recipe-saved'.
// Uso: x-data="dxfRecipeWizard(task.id, csrfFn, msgs)". Dipende da Alpine.js e station_calibration.js.
function dxfRecipeWizard(taskId, csrf, msgs) {
  // Colori overlay per ruolo, uguali a vision_execute.js (reference, roi, found)
  const ROLE_COLORS = { reference: '#2563eb', found: '#16a34a', roi: '#f59e0b' };
  const VALUE_KEYS = ['dxf.points_in_pct', 'dxf.distance_avg', 'dxf.distance_min', 'dxf.distance_max'];

  return {
    taskId: taskId,
    msgs: msgs || {},
    open: false,
    stations: [],
    stationId: '',
    calState: '',          // '' | calibrated | uncalibrated | unreachable
    calLabel: '',
    calUrl: '',
    imageFile: null,       // immagine caricata o acquisita
    imageName: '',
    imageSrc: '',
    dxfFile: null,
    bandMm: 0.1,
    minPointsPct: 95,
    dark: true,            // spuntato = pezzo scuro su fondo chiaro (controluce)
    busy: false,
    grabbing: false,
    error: '',
    notice: '',
    result: null,          // corpo B3 {result, saved, recipe_dir, outputs}

    async toggle() {
      this.open = !this.open;
      if (this.open && !this.stations.length) await this.loadStations();
    },

    async loadStations() {
      try {
        const resp = await fetch('/maker/api/stations');
        if (resp.ok) this.stations = await resp.json();
      } catch (e) { console.error('dxfRecipeWizard stations', e); }
      // Una sola stazione con camera: preselezionata
      if (this.stations.length === 1) {
        this.stationId = String(this.stations[0].id);
        await this.onStation();
      }
    },

    // Cambio stazione: rilegge lo stato di calibrazione dall'acquisitore
    async onStation() {
      this.calState = ''; this.calLabel = ''; this.calUrl = '';
      this.result = null;
      if (!this.stationId) return;
      const r = await fetchStationCalibration(this.stationId);
      this.calState = r.state || 'unreachable';
      this.calUrl = r.calibration_url || '';
      if (this.calState === 'calibrated') this.calLabel = formatCalibration(r.calibration || {});
    },

    get calibrated() { return this.calState === 'calibrated'; },
    get canRun() {
      return !!(this.stationId && this.calibrated && this.imageFile && this.dxfFile) && !this.busy;
    },

    _setImage(file) {
      if (this.imageSrc) URL.revokeObjectURL(this.imageSrc);
      this.imageFile = file;
      this.imageName = file.name || '';
      this.imageSrc = URL.createObjectURL(file);
      this.result = null;
    },

    onImage(ev) {
      const f = ev.target.files && ev.target.files[0];
      if (f) this._setImage(f);
    },
    onDxf(ev) { this.dxfFile = (ev.target.files && ev.target.files[0]) || null; this.result = null; },

    // Frame dalla camera della stazione scelta
    async grab() {
      if (!this.stationId || this.grabbing) return;
      this.grabbing = true;
      this.error = '';
      try {
        const resp = await fetch(`/maker/api/stations/${this.stationId}/camera/grab`, {
          method: 'POST', headers: { 'X-CSRFToken': this._csrf() },
        });
        if (!resp.ok) {
          const body = await resp.json().catch(() => ({}));
          this.error = body.detail || this.msgs.requestFailed || 'Error';
        } else {
          const blob = await resp.blob();
          this._setImage(new File([blob], 'camera.png', { type: blob.type || 'image/png' }));
        }
      } catch (e) {
        this.error = this.msgs.requestFailed || String(e);
      }
      this.grabbing = false;
    },

    _csrf() { return typeof csrf === 'function' ? csrf() : csrf; },

    // Il 422 porta `detail` (stringa o lista) oppure `errors`
    _errorText(body) {
      if (Array.isArray(body.errors) && body.errors.length) return body.errors.map(String).join('; ');
      const d = body.detail;
      if (Array.isArray(d)) return d.map(x => (typeof x === 'string' ? x : (x.msg || JSON.stringify(x)))).join('; ');
      if (d && typeof d === 'object') return JSON.stringify(d);
      return d || this.msgs.requestFailed || 'Error';
    },

    async run(save) {
      if (!this.canRun) return;
      this.busy = true;
      this.error = '';
      this.notice = '';
      try {
        const fd = new FormData();
        fd.append('image', this.imageFile, this.imageFile.name || 'capture.png');
        fd.append('dxf', this.dxfFile, this.dxfFile.name);
        fd.append('station_id', this.stationId);
        fd.append('band_mm', String(this.bandMm));
        fd.append('min_points_pct', String(this.minPointsPct));
        fd.append('polarity', this.dark ? 'dark' : 'light');
        fd.append('save', save ? 'true' : 'false');
        const resp = await fetch(`/maker/api/vision/tasks/${this.taskId}/recipe/dxf-compare`, {
          method: 'POST', headers: { 'X-CSRFToken': this._csrf() }, body: fd,
        });
        const body = await resp.json().catch(() => ({}));
        if (!resp.ok || body.error) {
          this.error = this._errorText(body);
        } else {
          this.result = body;
          this.$nextTick(() => this.drawOverlay());
          if (save && body.saved) {
            this.notice = this.msgs.saved || 'Saved';
            // Il componente visionRecipe ricarica cartella, file e uscite delle quote
            this.$dispatch('dxf-recipe-saved', { taskId: this.taskId });
          }
        }
      } catch (e) {
        this.error = this.msgs.requestFailed || String(e);
      }
      this.busy = false;
    },

    // Le quattro uscite del confronto, nell'ordine fisso
    get values() {
      const out = (this.result && this.result.result && this.result.result.outputs) || {};
      return VALUE_KEYS.map(k => ({ key: k, value: out[k] }));
    },

    fmt(v) {
      return (typeof v === 'number') ? v.toLocaleString(document.documentElement.lang || 'it',
        { maximumFractionDigits: 3 }) : '-';
    },

    // Come vision_execute.js: canvas della dimensione dell'immagine, coordinate in pixel immagine
    drawOverlay() {
      const img = this.$refs.img, cv = this.$refs.overlay;
      if (!img || !cv || !img.naturalWidth) return;
      cv.width = img.naturalWidth;
      cv.height = img.naturalHeight;
      const g = cv.getContext('2d');
      g.clearRect(0, 0, cv.width, cv.height);
      g.lineWidth = Math.max(2, cv.width / 400);
      g.lineJoin = 'round';
      const shapes = (this.result && this.result.result && this.result.result.overlay) || [];
      for (const item of shapes) {
        const rows = item.rows || [], cols = item.cols || [];
        if (!rows.length || rows.length !== cols.length) continue;
        g.strokeStyle = ROLE_COLORS[item.role] || '#ef4444';
        g.beginPath();
        g.moveTo(cols[0], rows[0]);
        for (let i = 1; i < rows.length; i++) g.lineTo(cols[i], rows[i]);
        g.stroke();
      }
    },
  };
}