import { Prisma } from '@prisma/client';
import { AccountingHttpError, httpRequest, parseLooseJson } from '../accounting-http';
import { jalaliToIsoDate, toIsoDateTehran } from '../jalali';
import {
  AccountingProvider,
  AccountingProviderError,
  ExternalCustomer,
  ProviderSettings,
  StatementRow,
  ZERO,
  dec,
  normalizeMobile,
  splitName,
  str,
} from './accounting-provider';

/**
 * Zarrin (زرین) — https://zarrin.ir/api-docs/ (the page renders
 * /wp-content/themes/Hirad/data/api.json, 82 entries).
 *
 * Wire format: GET <base>?kind=<api>&token=<token>&<params>, where <base> is
 * the installation's `http://host:8000/ZarrinService/accounting`. The token
 * travels in the query string, so a URL built here must never be logged.
 *
 * NOT verified against a live installation — the owner has none to test on
 * (plan, decision 11). Everything below follows the documentation and its
 * sample outputs, and is covered by unit tests built from those samples. The
 * open points (balance sign, which rial field the stones belong in) are
 * configurable or flagged, and the integration is to be switched on for real
 * only after a trial period on temporary documents.
 *
 * Differences from Tahesab that shape the sync:
 *   * No idempotency key on foroushSakhte. A timed-out document call cannot be
 *     retried blindly — the worker parks it as NEEDS_REVIEW.
 *   * foroushSakhte does not return the row id needed to delete a document;
 *     deleteDocument looks it up from the account's ledger (parvande).
 *   * کارساخته can be created (addFelezsakhteModel) but never edited.
 */

const STATEMENT_PAGE = 250;
const CHANGE_WINDOW = 50;
const MAX_STATEMENT_PAGES = 20;

function endpoint(s: ProviderSettings) {
  return s.baseUrl.trim();
}

async function call(
  s: ProviderSettings,
  kind: string,
  params: Record<string, string | number | null | undefined> = {},
): Promise<Record<string, unknown> | unknown[]> {
  let url: URL;
  try {
    url = new URL(endpoint(s));
  } catch {
    throw new AccountingProviderError('زرین: آدرس سرور نامعتبر است');
  }
  url.searchParams.set('kind', kind);
  url.searchParams.set('token', s.token);
  for (const [k, v] of Object.entries(params)) {
    if (v !== null && v !== undefined && v !== '') url.searchParams.set(k, String(v));
  }

  let res;
  try {
    res = await httpRequest({ method: 'GET', url: url.toString(), timeoutMs: s.timeoutMs, ca: s.caCert });
  } catch (err) {
    if (err instanceof AccountingHttpError) {
      throw new AccountingProviderError(`زرین (${kind}): ${err.message}`, err.ambiguous);
    }
    throw err;
  }

  if (res.status < 200 || res.status >= 300) {
    throw new AccountingProviderError(`زرین (${kind}): HTTP ${res.status}`, false, res.body.slice(0, 500), res.status === 404);
  }

  let json: unknown;
  try {
    json = parseLooseJson(res.body);
    // The documented outputs are JSON-encoded strings of JSON ("{\"state\":…}").
    if (typeof json === 'string' && /^\s*[{[]/.test(json)) json = parseLooseJson(json);
  } catch {
    throw new AccountingProviderError(`زرین (${kind}): پاسخ نامعتبر`, true, res.body.slice(0, 500));
  }
  if (!json || typeof json !== 'object') {
    throw new AccountingProviderError(`زرین (${kind}): پاسخ نامعتبر`, true, json);
  }

  const o = json as Record<string, unknown>;
  if (o.state === false || o.status === false) {
    const msg = str(o.msg) ?? str(o.detail) ?? str(o.message) ?? 'خطای نامشخص';
    throw new AccountingProviderError(`زرین (${kind}): ${msg}`, false, json, /یافت نشد|موجود نیست/.test(msg));
  }
  return json as Record<string, unknown> | unknown[];
}

/** Zarrin wraps lists as `data`, once as `date` (Get100Account), or not at all. */
function listOf(json: unknown): Record<string, unknown>[] {
  if (Array.isArray(json)) return json as Record<string, unknown>[];
  if (json && typeof json === 'object') {
    const o = json as Record<string, unknown>;
    for (const key of ['data', 'date', 'mande']) {
      if (Array.isArray(o[key])) return o[key] as Record<string, unknown>[];
    }
    if ('id' in o || 'code' in o) return [o];
  }
  return [];
}

function dataOf(json: unknown): Record<string, unknown> {
  const o = (json ?? {}) as Record<string, unknown>;
  const d = o.data;
  if (d && typeof d === 'object' && !Array.isArray(d)) return d as Record<string, unknown>;
  return o;
}

function joinName(first: unknown, last: unknown) {
  return [str(first), str(last)].filter(Boolean).join(' ').trim();
}

/** Zarrin prints dates as yy/mm/dd of the 1400s: "04/05/29" → "1404/05/29". */
function fullJalali(v: unknown): string {
  const s = str(v) ?? '';
  const m = s.match(/^(\d{2})\/(\d{1,2})\/(\d{1,2})$/);
  if (!m) return s;
  return `14${m[1]}/${m[2].padStart(2, '0')}/${m[3].padStart(2, '0')}`;
}

function signed(s: ProviderSettings, v: Prisma.Decimal) {
  // Until checked on a real installation (plan §9) the sign is a setting.
  return (s.balanceOwesWhen ?? 'negative') === 'negative' ? v.negated() : v;
}

export const zarrinProvider: AccountingProvider = {
  name: 'zarrin',
  label: 'زرین',
  capabilities: { createKarSakhte: true, documentInquiry: false, movementScope: 'all', changeFeed: true },

  async health(s) {
    const v = (await call(s, 'version')) as Record<string, unknown>;
    // `version` may not check the token; a group listing does.
    const groups = listOf(await call(s, 'listGorooheHesabha'));
    return { version: v.version, message: v.message, customerGroups: groups.length };
  },

  async listCustomerGroups(s) {
    return listOf(await call(s, 'listGorooheHesabha')).map((g) => ({
      id: String(g.id),
      name: str(g.name) ?? String(g.id),
    }));
  },

  async listCustomers(s, cursor) {
    const from = Number(cursor ?? 0) || 0;
    // Get100Account pages by code (100 accounts from `id` on) but carries no
    // group or address; listhesabha over the same code span fills those in.
    const page = listOf(await call(s, 'Get100Account', { id: from }));
    if (page.length === 0) return { items: [], next: null };

    const codes = page.map((r) => Number(r.code)).filter(Number.isFinite);
    const lo = Math.min(...codes);
    const hi = Math.max(...codes);
    const details = new Map<string, Record<string, unknown>>();
    for (const r of listOf(await call(s, 'listhesabha', { az: lo, ta: hi }))) details.set(String(r.id), r);

    const items: ExternalCustomer[] = page.map((r) => {
      const code = String(r.code);
      const d = details.get(code) ?? {};
      return {
        code,
        name: str(d.nam) ?? joinName(r.name, r.namKhanevadegi),
        mobile: normalizeMobile(d.mobile ?? r.mobile),
        phone: str(d.tell),
        nationalCode: str(d.codeMeli),
        address: str(d.address),
        groupId: null,
        groupName: str(d.gorooh),
      };
    });
    const next = page.length < 100 ? null : String(hi + 1);
    return { items, next };
  },

  async findCustomersByMobile(s, mobile) {
    const target = normalizeMobile(mobile);
    if (!target) return [];
    let rows: Record<string, unknown>[];
    try {
      rows = listOf(await call(s, 'getinfoByPhone', { number: target }));
    } catch (err) {
      if (err instanceof AccountingProviderError && err.notFound) return [];
      throw err;
    }
    return rows
      .filter((r) => r.code !== undefined && normalizeMobile(r.mobile) === target)
      .map((r) => ({
        code: String(r.code),
        name: joinName(r.nam, r.namKhanevadegi),
        mobile: target,
        phone: str(r.tel),
        nationalCode: null,
        address: str(r.address),
        groupId: null,
        groupName: null,
      }));
  },

  async createCustomer(s, p) {
    const json = (await call(s, 'addAccount', {
      firstName: p.firstName || p.fullName,
      lastName: p.lastName || '-',
      fkNoe: p.group.id,
      mobile: p.mobile,
      telephone: p.phone,
      address: p.address,
      codeMelli: p.nationalCode,
    })) as Record<string, unknown>;
    const id = json.id ?? dataOf(json).id;
    if (id === undefined || id === null) throw new AccountingProviderError('زرین: کد حساب جدید برنگشت', false, json);
    return { code: String(id), response: json };
  },

  async updateCustomer(s, code, p) {
    const json = await call(s, 'edithesab', {
      id: code,
      name: p.firstName || p.fullName,
      family: p.lastName,
      mobile: p.mobile,
      tel: p.phone,
      address: p.address,
      codeMeli: p.nationalCode,
      // Without nameG Zarrin moves the account into its customers group, so the
      // current group is always sent back.
      nameG: p.group.name,
    });
    return { response: json };
  },

  async getBalances(s, codes) {
    if (codes.length === 0) return [];
    const wanted = new Set(codes);
    const rows =
      codes.length === 1
        ? listOf(await call(s, 'listMandeHesabha', { id: codes[0], isRial: 0 }))
        : listOf(await call(s, 'listMandeHesabha', { isRial: 0 }));
    return rows
      .filter((r) => wanted.has(String(r.id)))
      .map((r) => ({
        code: String(r.id),
        goldGrams: signed(s, dec(r.geram) ?? ZERO),
        rial: signed(s, dec(r.pool) ?? ZERO),
      }));
  },

  async getChanges(s, cursor) {
    // parLastTenRadif without an account is the newest rows of the whole
    // journal; each row names its account (idHesab) and has an ascending idRadif.
    // Not yet seen on a real install (ACC-01).
    const rows = listOf(await call(s, 'parLastTenRadif', { limit: CHANGE_WINDOW }));
    let maxId = 0;
    for (const r of rows) maxId = Math.max(maxId, Number(r.idRadif) || 0);
    if (cursor === null) return { cursor: String(maxId), accountCodes: [], itemNames: [], overflow: false };
    const seen = Number(cursor) || 0;
    const fresh = rows.filter((r) => (Number(r.idRadif) || 0) > seen);
    const accounts = new Set<string>();
    for (const r of fresh) {
      const code = str(r.idHesab);
      if (code) accounts.add(code);
    }
    return {
      cursor: String(Math.max(maxId, seen)),
      accountCodes: [...accounts],
      itemNames: [],
      overflow: rows.length >= CHANGE_WINDOW && fresh.length === rows.length,
    };
  },

  async getStatement(s, q) {
    const rows: Record<string, unknown>[] = [];
    for (let page = 1; page <= MAX_STATEMENT_PAGES; page += 1) {
      const batch = listOf(
        await call(s, 'parvande', {
          id: q.code,
          dateAz: jalaliToIsoDate(q.from),
          dateTa: jalaliToIsoDate(q.to),
          pageNum: page,
          detailCount: STATEMENT_PAGE,
        }),
      );
      rows.push(...batch);
      if (batch.length < STATEMENT_PAGE) break;
    }

    // parvande has no running balance; it opens with «مانده از قبل» and the
    // balance is folded from there. پرداخت = we gave = the customer owes more.
    let gold = ZERO;
    let rial = ZERO;
    return rows.map((r): StatementRow => {
      const goldIn = dec(r.vaznTarazooDaryaft) ?? ZERO;
      const goldOut = dec(r.vaznTarazooPardakht) ?? ZERO;
      const rialIn = dec(r.poolDaryaft) ?? ZERO;
      const rialOut = dec(r.poolPardakht) ?? ZERO;
      gold = gold.add(goldOut).sub(goldIn);
      rial = rial.add(rialOut).sub(rialIn);
      const factor = str(r.idFactor);
      return {
        key: String(r.idRadif ?? ''),
        documentRef: factor && factor !== '0' ? factor : '',
        accountCode: String(r.idHesab ?? q.code),
        documentNo: factor && factor !== '0' ? factor : '',
        date: fullJalali(r.tarikh),
        time: null,
        title: str(r.noeRadif) ?? str(r.noeFactor) ?? str(r.sharh) ?? '',
        description: str(r.sharh),
        itemName: str(r.namFelez),
        weight: dec(r.vaznDaryaft)?.gt(0) ? dec(r.vaznDaryaft) : dec(r.vaznPardakht),
        karat: dec(r.ayar)?.toNumber() || null,
        count: null,
        unitPrice: null,
        wagePercent: null,
        goldIn,
        goldOut,
        rialIn,
        rialOut,
        goldBalance: gold,
        rialBalance: rial,
        metal: null,
        temporary: false,
      };
    });
  },

  async listKarSakhteGroups(s) {
    return listOf(await call(s, 'goroohSakhte')).map((g) => ({ id: String(g.id), name: str(g.name) ?? String(g.id) }));
  },

  async listKarSakhteTypes(s) {
    const types = new Map<string, string>();
    for (const r of listOf(await call(s, 'listKarSakhte'))) {
      if (r.fkNoe !== undefined) types.set(String(r.fkNoe), str(r.NoeName) ?? String(r.fkNoe));
    }
    return [...types].map(([id, name]) => ({ id, name }));
  },

  async listKarSakhte(s) {
    return listOf(await call(s, 'listKarSakhte'))
      .filter((r) => r.id !== undefined && str(r.namFelezsakhthe))
      .map((r) => ({
        code: String(r.id),
        name: str(r.namFelezsakhthe) as string,
        // listKarSakhte carries the item's type (گرمی/تعدادی…) but not its
        // group (النگو/انگشتر…); category stays the app's call (D27).
        groupId: null,
        groupName: null,
        typeId: str(r.fkNoe),
        typeName: str(r.NoeName),
        saleWagePercent: dec(r.darsadForoosh),
        stockWeight: dec(r.vazn),
        stockCount: dec(r.tedad),
      }));
  },

  async getKarSakhteStock(s, item) {
    const d = dataOf(await call(s, 'mojoodiKala', { id: item.code, dateTa: toIsoDateTehran(new Date()) }));
    const qty = dec(d.mojoodi);
    const byWeight = /گرم/.test(String(d.noeName ?? 'گرمی'));
    return { weight: byWeight ? qty : null, count: byWeight ? null : qty };
  },

  async getKarSakhteMovement(s, from, to) {
    return listOf(await call(s, 'infogardeshsakhte', { az: jalaliToIsoDate(from), ta: jalaliToIsoDate(to) })).map(
      (r) => ({
        itemCode: str(r.code_kar),
        itemName: str(r.nam_kar) ?? '—',
        date: str(r.tarikh_akharin_gardesh) ?? '',
        description: str(r.sharh_akharin_gardesh),
        weight: dec(r.vazn_akharin_gardesh),
        amount: dec(r.mablagh_akharin_gardesh),
        count: null,
      }),
    );
  },

  async createKarSakhte(s, item) {
    const json = (await call(s, 'addFelezsakhteModel', {
      nameKar: item.name,
      noeKar: item.typeId,
      gorooheKar: item.groupId,
    })) as Record<string, unknown>;
    const id = json.idKar ?? dataOf(json).idKar;
    if (id === undefined || id === null) throw new AccountingProviderError('زرین: کد کارساخته‌ی جدید برنگشت', false, json);
    return { code: String(id), response: json };
  },

  async postOrderDocument(s, doc, progress, onProgress) {
    let factorId = progress.factorId;
    let done = progress.doneLines ?? 0;
    let last: unknown = null;

    for (let i = done; i < doc.lines.length; i += 1) {
      const line = doc.lines[i];
      const isLast = i === doc.lines.length - 1;
      last = await call(s, 'foroushSakhte', {
        // The first call opens the invoice for the account; the rest append.
        ...(factorId ? { idFactor: factorId } : { idHesab: doc.customerCode }),
        idSakhte: line.itemCode,
        // Bonak mode: mablagh is the rial charge, darsad the per-gram making charge.
        mablagh: line.flatRial.toFixed(0),
        sharh: line.description,
        vazn: line.weightGrams.toFixed(3),
        vaznSang: 0,
        mablaghSang: 0,
        pd: -1, // پرداخت: goods leave to the customer
        darsad: line.wagePercent.toString(),
        // The invoice has to stay open while lines are still to come; the last
        // line closes it unless the document is to stay temporary (D27: it is).
        movaghat: doc.temporary || !isLast ? 1 : 0,
        bonak: 1,
      });
      const id = (dataOf(last).idFactor ?? (last as Record<string, unknown>).idFactor) as unknown;
      if (!factorId) {
        if (id === undefined || id === null) throw new AccountingProviderError('زرین: شماره فاکتور برنگشت', true, last);
        factorId = String(id);
      }
      done = i + 1;
      await onProgress({ factorId, doneLines: done });
    }

    return { ref: String(factorId ?? ''), progress: { factorId, doneLines: done }, response: last };
  },

  async documentExists() {
    // No lookup by our own key exists in Zarrin's API.
    return false;
  },

  async deleteDocument(s, doc) {
    if (!doc.ref) throw new AccountingProviderError('زرین: شماره فاکتور سند معلوم نیست');
    // hazfRadifSanad needs a row id, which foroushSakhte never returned; find
    // one in the account's ledger for the last year.
    const today = new Date();
    const yearAgo = new Date(today.getTime() - 366 * 24 * 3600 * 1000);
    const rows = listOf(
      await call(s, 'parvande', {
        id: doc.customerCode,
        dateAz: toIsoDateTehran(yearAgo),
        dateTa: toIsoDateTehran(today),
        pageNum: 1,
        detailCount: STATEMENT_PAGE,
      }),
    );
    const row = rows.find((r) => String(r.idFactor) === doc.ref && str(r.idRadif) && String(r.idRadif) !== '0');
    if (!row) return { response: { alreadyDeleted: true } };
    const json = await call(s, 'hazfRadifSanad', {
      pkRadifSanad: String(row.idRadif),
      kol: 1,
      commentUser: 'لغو سفارش در اپ',
    });
    return { response: json };
  },
};

/** Exposed for tests. */
export const __zarrinInternals = { listOf, fullJalali };