import { describe, it, expect } from 'vitest';
import { expectTag } from '@shared/testing/expect-tag';
import { OrgTemplate, OrgTemplateAdminView } from './org-template';
import { OrgTemplateState, reduce } from './org-template.machine';
import { DocumentCategory } from '@shared/domain/upload.machine';

const template: OrgTemplate = {
  subOrgId: 'cibg-registers',
  orgName: 'CIBG',
  returnAddress: 'Postbus 1\n2500 AA Den Haag',
  footerContact: 'info@cibg.nl',
  footerLegal: 'CIBG is onderdeel van VWS',
  signatureName: 'A. de Vries',
  signatureRole: 'Hoofd Registratie',
  signatureClosing: 'Met vriendelijke groet,',
  margins: { topMm: 25, rightMm: 20, bottomMm: 25, leftMm: 20 },
  version: 3,
};

const view = (over: Partial<OrgTemplateAdminView> = {}): OrgTemplateAdminView => ({
  draft: template,
  publishedVersion: 3,
  history: [],
  unsentBriefs: 2,
  ...over,
});

const loaded = (): OrgTemplateState =>
  reduce({ tag: 'Loading' }, { tag: 'DraftLoaded', view: view() });

const logoCategory: DocumentCategory = {
  categoryId: 'org-logo',
  label: 'Logo',
  description: '',
  required: false,
  acceptedTypes: ['image/png'],
  maxSizeMb: 2,
  multiple: false,
  allowPostDelivery: false,
};

describe('org-template.machine', () => {
  it('DraftLoaded moves to loaded with the draft, clean', () => {
    const s = expectTag(loaded(), 'Loaded');
    expect(s.draft.orgName).toBe('CIBG');
    expect(s.subOrgId).toBe('cibg-registers');
    expect(s.unsentBriefs).toBe(2);
    expect(s.dirty).toBe(false);
  });

  it('LoadFailed carries the reason', () => {
    const s = reduce({ tag: 'Loading' }, { tag: 'LoadFailed', reason: 'boom' });
    expect(s).toEqual({ tag: 'Failed', reason: 'boom' });
  });

  it('FieldEdited edits the draft and marks dirty', () => {
    const s = expectTag(
      reduce(loaded(), { tag: 'FieldEdited', field: 'orgName', value: 'CIBG Nieuw' }),
      'Loaded',
    );
    expect(s.draft.orgName).toBe('CIBG Nieuw');
    expect(s.dirty).toBe(true);
  });

  it('MarginEdited edits one edge and marks dirty', () => {
    const s = expectTag(
      reduce(loaded(), { tag: 'MarginEdited', edge: 'topMm', value: 40 }),
      'Loaded',
    );
    expect(s.draft.margins.topMm).toBe(40);
    expect(s.draft.margins.leftMm).toBe(20);
    expect(s.dirty).toBe(true);
  });

  it('DraftSaved clears dirty when the saved draft is the current one', () => {
    const edited = expectTag(
      reduce(loaded(), { tag: 'FieldEdited', field: 'orgName', value: 'X' }),
      'Loaded',
    );
    const s = expectTag(reduce(edited, { tag: 'DraftSaved', savedDraft: edited.draft }), 'Loaded');
    expect(s.dirty).toBe(false);
    expect(s.draft.orgName).toBe('X');
  });

  it('DraftSaved keeps dirty when an edit landed during the save round-trip', () => {
    const editing = expectTag(
      reduce(loaded(), { tag: 'FieldEdited', field: 'orgName', value: 'X' }),
      'Loaded',
    );
    const savedDraft = editing.draft;
    // a further edit changes the draft reference before the save resolves
    const raced = reduce(editing, { tag: 'FieldEdited', field: 'orgName', value: 'Y' });
    const s = expectTag(reduce(raced, { tag: 'DraftSaved', savedDraft }), 'Loaded');
    expect(s.dirty).toBe(true);
  });

  it('edits are no-ops in non-loaded states', () => {
    expect(
      reduce({ tag: 'Loading' }, { tag: 'FieldEdited', field: 'orgName', value: 'x' }),
    ).toEqual({
      tag: 'Loading',
    });
  });

  it('a completed logo upload sets logoDocumentId + dirty', () => {
    const withCat = reduce(loaded(), {
      tag: 'Upload',
      msg: { type: 'CategoriesLoaded', categories: [logoCategory] },
    });
    const selected = reduce(withCat, {
      tag: 'Upload',
      msg: {
        type: 'FileSelected',
        categoryId: 'org-logo',
        localId: 'a',
        fileName: 'l.png',
        fileSizeMb: 0.1,
      },
    });
    const done = expectTag(
      reduce(selected, {
        tag: 'Upload',
        msg: { type: 'UploadComplete', localId: 'a', documentId: 'doc-1' },
      }),
      'Loaded',
    );
    expect(done.draft.logoDocumentId).toBe('doc-1');
    expect(done.dirty).toBe(true);
  });

  it('removing the logo clears logoDocumentId + dirty', () => {
    const withLogo = reduce(loaded(), {
      tag: 'Upload',
      msg: { type: 'UploadComplete', localId: 'a', documentId: 'doc-1' },
    });
    const removed = expectTag(
      reduce(withLogo, {
        tag: 'Upload',
        msg: { type: 'UploadRemoved', localId: 'a' },
      }),
      'Loaded',
    );
    expect(removed.draft.logoDocumentId).toBeUndefined();
    expect(removed.dirty).toBe(true);
  });

  it('DraftLoaded (sub-org switch) keeps the loaded logo category, drops uploads', () => {
    const withCat = reduce(loaded(), {
      tag: 'Upload',
      msg: { type: 'CategoriesLoaded', categories: [logoCategory] },
    });
    const switched = expectTag(
      reduce(withCat, {
        tag: 'DraftLoaded',
        view: view({ draft: { ...template, subOrgId: 'cibg-vakbekwaamheid' } }),
      }),
      'Loaded',
    );
    expect(switched.upload.categories).toHaveLength(1);
    expect(switched.upload.uploads).toHaveLength(0);
    expect(switched.subOrgId).toBe('cibg-vakbekwaamheid');
  });

  // --- the action lifecycle + publish impact-confirm gate, folded into one union (RD-13) ---

  it('PublishRequested moves a loaded template to ConfirmingPublish', () => {
    const s = expectTag(reduce(loaded(), { tag: 'PublishRequested' }), 'Loaded');
    expect(s.action).toEqual({ tag: 'ConfirmingPublish' });
  });

  it('PublishCancelled returns to Idle', () => {
    const confirming = reduce(loaded(), { tag: 'PublishRequested' });
    const s = expectTag(reduce(confirming, { tag: 'PublishCancelled' }), 'Loaded');
    expect(s.action).toEqual({ tag: 'Idle' });
  });

  it('ActionStarted from ConfirmingPublish goes to Busy, so confirming and busy cannot coexist', () => {
    const confirming = expectTag(reduce(loaded(), { tag: 'PublishRequested' }), 'Loaded');
    expect(confirming.action.tag).toBe('ConfirmingPublish');
    const s = expectTag(reduce(confirming, { tag: 'ActionStarted' }), 'Loaded');
    expect(s.action).toEqual({ tag: 'Busy' });
  });

  it('ActionFailed carries the error', () => {
    const busy = reduce(loaded(), { tag: 'ActionStarted' });
    const s = expectTag(reduce(busy, { tag: 'ActionFailed', error: 'mislukt' }), 'Loaded');
    expect(s.action).toEqual({ tag: 'Failed', error: 'mislukt' });
  });

  it('DraftLoaded resets a stale action error to Idle', () => {
    const failed = reduce(loaded(), { tag: 'ActionFailed', error: 'mislukt' });
    const s = expectTag(reduce(failed, { tag: 'DraftLoaded', view: view() }), 'Loaded');
    expect(s.action).toEqual({ tag: 'Idle' });
  });

  it('an action message is a no-op when the template is not loaded', () => {
    expect(reduce({ tag: 'Loading' }, { tag: 'PublishRequested' })).toEqual({ tag: 'Loading' });
    expect(reduce({ tag: 'Loading' }, { tag: 'ActionStarted' })).toEqual({ tag: 'Loading' });
    expect(reduce({ tag: 'Loading' }, { tag: 'ActionFailed', error: 'x' })).toEqual({
      tag: 'Loading',
    });
  });
});