import { makeRequest, logger, getEbayMarketplaceId } from './shared.js';

const SELLING_POLICY_PROGRAM = 'SELLING_POLICY_MANAGEMENT';
export const POLICY_CATEGORY_TYPE = 'ALL_EXCLUDING_MOTORS_VEHICLES';

export function idOf(value) {
  if (value == null) return '';
  if (typeof value === 'object') {
    if (value._id != null) return String(value._id);
    return String(value);
  }
  return String(value);
}

export function isPopulatedDocument(value) {
  return (
    value &&
    typeof value === 'object' &&
    !(value.constructor?.name === 'ObjectId') &&
    (value.name != null || value._reference != null || Array.isArray(value.marketplaces))
  );
}

export function getMarketplaceMapping(doc, marketplace) {
  const marketplaceId = idOf(marketplace);
  if (!marketplaceId) return (doc?.marketplaces || [])[0] || null;
  return (
    (doc?.marketplaces || []).find((entry) => idOf(entry.marketplace) === marketplaceId) || null
  );
}

export function mappingExternalReference(doc, marketplace) {
  return getMarketplaceMapping(doc, marketplace)?.externalReference || '';
}

export async function persistMarketplaceMapping(
  model,
  doc,
  marketplace,
  { externalReference, stateType, message } = {}
) {
  if (!model || !doc) return null;
  const marketplaceId = idOf(marketplace);
  const docId = idOf(doc);
  if (!marketplaceId || !docId) return null;

  const current = (await model.findById(docId).lean()) || doc;
  const mappings = [...(current?.marketplaces || [])];
  const index = mappings.findIndex((entry) => idOf(entry.marketplace) === marketplaceId);
  const previous = index >= 0 ? mappings[index] : {};
  const next = {
    ...(previous._id ? { _id: previous._id } : {}),
    marketplace: previous.marketplace || marketplaceId,
    externalReference:
      externalReference !== undefined ? externalReference : previous.externalReference,
    state: {
      type: stateType || previous.state?.type || 'pending',
      ...(message != null && message !== ''
        ? { message }
        : stateType === 'failed'
          ? { message: previous.state?.message }
          : {}),
    },
  };

  if (index >= 0) mappings[index] = next;
  else mappings.push(next);

  await model.updateOne({ _id: docId }, { $set: { marketplaces: mappings } });

  try {
    const { deleteObjectCache } = await import('../../../database/database.js');
    const { distributeUpdate } = await import('../../../utils.js');
    await deleteObjectCache({ model, id: docId });
    let broadcastMappings = mappings;
    const query = model.findById(docId);
    if (typeof query?.populate === 'function') {
      const populated = await query.populate('marketplaces.marketplace').lean();
      if (populated?.marketplaces) broadcastMappings = populated.marketplaces;
    }
    await distributeUpdate({ marketplaces: broadcastMappings }, docId, model.modelName);
  } catch (err) {
    logger.debug(`Could not broadcast marketplace mapping update for ${docId}: ${err.message}`);
  }

  return next;
}

async function fetchOptedInPrograms(marketplace) {
  const result = await makeRequest({
    marketplace,
    path: '/sell/account/v1/program/get_opted_in_programs',
  });
  return result?.programs || [];
}

function hasSellingPolicyManagement(programs) {
  return programs.some((program) => program?.programType === SELLING_POLICY_PROGRAM);
}

export async function ensureSellingPolicyManagement(marketplace) {
  if (hasSellingPolicyManagement(await fetchOptedInPrograms(marketplace))) {
    return;
  }

  logger.info('Opting eBay seller account into Selling Policy Management');
  await makeRequest({
    marketplace,
    method: 'POST',
    path: '/sell/account/v1/program/opt_in',
    body: { programType: SELLING_POLICY_PROGRAM },
    acceptableStatuses: [409],
  });

  if (!hasSellingPolicyManagement(await fetchOptedInPrograms(marketplace))) {
    throw new Error(
      'eBay Selling Policy Management enrollment was requested but is not active yet. eBay can take up to 24 hours to process enrollment; retry publishing later.'
    );
  }
}

export function isDefaultAccountPolicy(existingPolicy, allPolicies = [], idField) {
  const existingId = existingPolicy?.[idField];
  if (!existingId) return false;

  const existingIdString = String(existingId);
  const sources = [existingPolicy, ...allPolicies];
  if (
    sources.some(
      (policy) =>
        String(policy?.[idField]) === existingIdString &&
        (policy.categoryTypes || []).some((type) => type?.default === true)
    )
  ) {
    return true;
  }

  const uniqueIds = [
    ...new Set(
      allPolicies.filter((policy) => policy?.[idField]).map((policy) => String(policy[idField]))
    ),
  ];
  return uniqueIds.length === 1 && uniqueIds[0] === existingIdString;
}

export function buildCategoryTypes(existingPolicy, allPolicies = [], idField) {
  const categoryType = { name: POLICY_CATEGORY_TYPE };
  if (idField && isDefaultAccountPolicy(existingPolicy, allPolicies, idField)) {
    categoryType.default = true;
  }
  return [categoryType];
}

function isDefaultStatusError(err) {
  return /changing the default status/i.test(err?.message || '');
}

function isUnchangedPolicyError(err) {
  return /same as in the system/i.test(err?.message || '');
}

export async function updateAccountPolicy(marketplace, path, policy) {
  try {
    await makeRequest({ marketplace, method: 'PUT', path, body: policy });
  } catch (err) {
    if (isUnchangedPolicyError(err)) {
      logger.debug(`eBay account policy ${path} is already up to date`);
      return;
    }
    if (policy.categoryTypes?.[0]?.default === true || !isDefaultStatusError(err)) {
      throw err;
    }
    logger.debug(`Retrying account policy ${path} with categoryTypes.default=true`);
    try {
      await makeRequest({
        marketplace,
        method: 'PUT',
        path,
        body: {
          ...policy,
          categoryTypes: [{ name: POLICY_CATEGORY_TYPE, default: true }],
        },
      });
    } catch (retryErr) {
      if (isUnchangedPolicyError(retryErr)) {
        logger.debug(`eBay account policy ${path} is already up to date`);
        return;
      }
      throw retryErr;
    }
  }
}

export async function loadPolicyDocument(model, value) {
  if (!value) return null;
  if (isPopulatedDocument(value)) return value;
  const id = idOf(value);
  if (!id) return null;
  return model.findById(id).populate(['marketplaces.marketplace']).lean();
}

export function resolveListingPolicy(listing, marketplace, listingField, defaultField) {
  return (
    listing?.[listingField] ||
    listing?.marketplace?.[defaultField] ||
    marketplace?.[defaultField] ||
    null
  );
}

export async function findLocalPolicyByExternalReference(model, marketplace, externalReference) {
  if (!externalReference) return null;
  return model
    .findOne({
      marketplaces: {
        $elemMatch: {
          marketplace: idOf(marketplace),
          externalReference: String(externalReference),
        },
      },
    })
    .lean();
}

export async function findLocalPolicyByName(model, marketplace, name) {
  if (!name) return null;
  return model
    .findOne({
      name,
      'marketplaces.marketplace': idOf(marketplace),
    })
    .lean();
}

export async function upsertLocalPolicyFromRemote({
  model,
  marketplace,
  remoteId,
  name,
  fields,
  user,
}) {
  let local =
    (await findLocalPolicyByExternalReference(model, marketplace, remoteId)) ||
    (await findLocalPolicyByName(model, marketplace, name));

  const mapping = {
    marketplace: idOf(marketplace),
    externalReference: String(remoteId),
    state: { type: 'ready' },
  };

  if (local) {
    const mappings = [...(local.marketplaces || [])];
    const index = mappings.findIndex((entry) => idOf(entry.marketplace) === idOf(marketplace));
    if (index >= 0) mappings[index] = { ...mappings[index], ...mapping };
    else mappings.push(mapping);
    await model.updateOne(
      { _id: local._id },
      {
        $set: {
          ...fields,
          name,
          marketplaces: mappings,
        },
      }
    );
    return model.findById(local._id).lean();
  }

  const created = await model.create({
    ...fields,
    name,
    marketplaces: [mapping],
  });
  return created.toObject ? created.toObject() : created;
}

export { getEbayMarketplaceId };