import { Automat } from 'automat';

export function createEmptyLineitem(line = {}) {
  return {
    key: line.key ?? `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
    name: line.name ?? null,
    sku: line.sku ?? null,
    amount: line.amount ?? null,
    pu: line.pu ?? null,
    unit: line.unit ?? null,
    netprice: line.netprice ?? null,
    taxrate: line.taxrate ?? null,
  };
}

export const initialDelivery = {
  id: null,
  deliveryId: null,
  date: null,
  deliveryEntity: null,
  partyId: null,
  externalNumber: null,
  external_number: null,
  number: null,
  type: null,
  lines: [],
  lineitems: [],
  notes: [],
  attachments: [],
  files: [],
};

export const initialState = {
  deliveryEntities: [],
  ...initialDelivery,
};

export const deliveryEditorAutomat = new Automat(initialState, {
  setId(id) {
    deliveryEditorAutomat.setState({ id, deliveryId: id });
  },

  setDeliveryEntities(deliveryEntities) {
    deliveryEditorAutomat.setState({ deliveryEntities: deliveryEntities ?? [] });
  },

  setDelivery(delivery = {}) {
    const rawLines = delivery.lines ?? delivery.lineitems ?? [];
    const lines = Array.isArray(rawLines) ? rawLines : [];
    const partyId = delivery.partyId ?? delivery.deliveryEntity ?? null;
    const extNum = delivery.externalNumber ?? delivery.external_number ?? null;
    const id = delivery.id ?? delivery.deliveryId ?? null;
    const notes = Array.isArray(delivery.notes)
      ? delivery.notes
      : delivery.notes ? [delivery.notes] : [];
    const rawAttachments = delivery.attachments ?? delivery.files ?? [];
    const attachments = Array.isArray(rawAttachments) ? rawAttachments : [];

    deliveryEditorAutomat.setState({
      ...initialDelivery,
      ...delivery,
      id,
      deliveryId: id,
      partyId,
      deliveryEntity: partyId,
      externalNumber: extNum,
      external_number: extNum,
      lines,
      lineitems: lines,
      notes,
      attachments,
      files: attachments,
    });
  },

  setDate(date) {
    deliveryEditorAutomat.setState({ date });
  },

  setDeliveryEntity(entityId) {
    deliveryEditorAutomat.setState({ deliveryEntity: entityId, partyId: entityId });
  },

  setPartyId(partyId) {
    deliveryEditorAutomat.setState({ deliveryEntity: partyId, partyId });
  },

  setExternalNumber(externalNumber) {
    deliveryEditorAutomat.setState({
      externalNumber,
      external_number: externalNumber,
    });
  },

  setNumber(number) {
    deliveryEditorAutomat.setState({ number });
  },

  setType(type) {
    deliveryEditorAutomat.setState({ type });
  },

  setLines(lines) {
    const cleanLines = lines ?? [];
    deliveryEditorAutomat.setState({ lines: cleanLines, lineitems: cleanLines });
  },

  setLineitems(lines) {
    const cleanLines = lines ?? [];
    deliveryEditorAutomat.setState({ lines: cleanLines, lineitems: cleanLines });
  },

  setNotes(notes) {
    const cleanNotes = Array.isArray(notes)
      ? notes
      : notes ? [notes] : [];
    deliveryEditorAutomat.setState({ notes: cleanNotes });
  },

  addLineitem(line = {}) {
    const item = createEmptyLineitem(line);
    const nextLines = [...(deliveryEditorAutomat.state.lines ?? []), item];
    deliveryEditorAutomat.setState({ lines: nextLines, lineitems: nextLines });
  },

  addLine(line = {}) {
    deliveryEditorAutomat.actions.addLineitem(line);
  },

  updateLineitem(payload) {
    const { index, key, ...fields } = payload || {};
    const currentLines = deliveryEditorAutomat.state.lines ?? [];
    let targetIndex = typeof index === 'number' && !Number.isNaN(index) ? index : -1;
    if (targetIndex === -1 && key != null) {
      targetIndex = currentLines.findIndex((l) => l.key === key);
    }
    if (targetIndex >= 0 && targetIndex < currentLines.length) {
      const nextLines = [...currentLines];
      nextLines[targetIndex] = {
        ...nextLines[targetIndex],
        ...fields,
      };
      deliveryEditorAutomat.setState({ lines: nextLines, lineitems: nextLines });
    }
  },

  updateLine(payload) {
    deliveryEditorAutomat.actions.updateLineitem(payload);
  },

  removeLineitem(payload) {
    const currentLines = deliveryEditorAutomat.state.lines ?? [];
    let index = typeof payload === 'number' && !Number.isNaN(payload) ? payload : -1;
    if (index === -1 && payload != null) {
      const key = typeof payload === 'string' ? payload : payload?.key;
      if (key != null) {
        index = currentLines.findIndex((l) => l.key === key);
      }
    }
    if (index >= 0 && index < currentLines.length) {
      const nextLines = currentLines.filter((_, i) => i !== index);
      deliveryEditorAutomat.setState({ lines: nextLines, lineitems: nextLines });
    }
  },

  removeLine(payload) {
    deliveryEditorAutomat.actions.removeLineitem(payload);
  },

  addAttachment(attachment) {
    const id = attachment.id ?? `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
    const item = { ...attachment, id };
    const next = [...(deliveryEditorAutomat.state.attachments ?? []), item];
    deliveryEditorAutomat.setState({ attachments: next, files: next });
  },

  setAttachments(attachments) {
    const clean = Array.isArray(attachments) ? attachments : [];
    deliveryEditorAutomat.setState({ attachments: clean, files: clean });
  },

  updateAttachment(payload) {
    const { id, ...fields } = payload || {};
    const current = deliveryEditorAutomat.state.attachments ?? [];
    const idx = current.findIndex((a) => a.id === id);
    if (idx !== -1) {
      const next = [...current];
      next[idx] = { ...next[idx], ...fields };
      deliveryEditorAutomat.setState({ attachments: next, files: next });
    }
  },

  removeAttachment(idOrIndex) {
    const current = deliveryEditorAutomat.state.attachments ?? [];
    let next;
    if (typeof idOrIndex === 'number') {
      next = current.filter((_, idx) => idx !== idOrIndex);
    } else {
      const id = typeof idOrIndex === 'string' ? idOrIndex : idOrIndex?.id;
      next = current.filter((a) => a.id !== id);
    }
    deliveryEditorAutomat.setState({ attachments: next, files: next });
  },

  resetDelivery() {
    deliveryEditorAutomat.setState({
      ...initialDelivery,
    });
  },

  resetDeliveryEditor() {
    deliveryEditorAutomat.setState({
      ...initialState,
    });
  },
});

export const {
  setId,
  setDeliveryEntities,
  setDelivery,
  setDate,
  setDeliveryEntity,
  setPartyId,
  setExternalNumber,
  setNumber,
  setType,
  setLines,
  setLineitems,
  setNotes,
  addLineitem,
  addLine,
  updateLineitem,
  updateLine,
  removeLineitem,
  removeLine,
  addAttachment,
  setAttachments,
  updateAttachment,
  removeAttachment,
  resetDelivery,
  resetDeliveryEditor,
} = deliveryEditorAutomat.actions;

// Selectors
export const selectDeliveryId = (state = deliveryEditorAutomat.state) => state.deliveryId ?? state.id;
export const selectDeliveryEntities = (state = deliveryEditorAutomat.state) => state.deliveryEntities;
export const selectDeliveryDate = (state = deliveryEditorAutomat.state) => state.date;
export const selectDeliveryEntity = (state = deliveryEditorAutomat.state) => state.deliveryEntity ?? state.partyId;
export const selectDeliveryExternalNumber = (state = deliveryEditorAutomat.state) => state.externalNumber ?? state.external_number;
export const selectDeliveryNumber = (state = deliveryEditorAutomat.state) => state.number;
export const selectDeliveryType = (state = deliveryEditorAutomat.state) => state.type;
export const selectDeliveryLineitems = (state = deliveryEditorAutomat.state) => state.lines ?? state.lineitems;
export const selectDeliveryNotes = (state = deliveryEditorAutomat.state) => state.notes;
export const selectDeliveryAttachments = (state = deliveryEditorAutomat.state) => state.attachments;

export default deliveryEditorAutomat;