import { getDb } from "@wrnexus/db";
import type { PaymentIntent, PaymentRefund, PaymentStore } from "./types.ts";

const parse = <T>(value: unknown, fallback: T): T => {
  try {
    return typeof value === "string" ? JSON.parse(value) : (value as T);
  } catch {
    return fallback;
  }
};
export function databasePaymentStore(database = "default"): PaymentStore {
  const db = () => getDb(database);
  const intent = (row: any): PaymentIntent => ({
    id: String(row.id),
    subject: String(row.subject),
    gateway: String(row.gateway),
    gatewayRef: String(row.gateway_ref),
    amount: Number(row.amount),
    currency: String(row.currency),
    idempotencyKey: String(row.idempotency_key),
    createdAt: Number(row.created_at),
    checkoutUrl: row.checkout_url ? String(row.checkout_url) : undefined,
    client: parse(row.client_json, {}),
    metadata: parse(row.metadata_json, {}),
  });
  const refund = (row: any): PaymentRefund => ({
    id: String(row.id),
    intentId: String(row.intent_id),
    gatewayRef: String(row.gateway_ref ?? ""),
    amount: Number(row.amount),
    currency: String(row.currency),
    reason: String(row.reason),
    idempotencyKey: String(row.idempotency_key),
    status: row.status,
    createdAt: Number(row.created_at),
  });
  return {
    async findIntentByKey(key) {
      const row = await db().one("SELECT * FROM wrn_payment_intent WHERE idempotency_key = ?", [
        key,
      ]);
      return row ? intent(row) : null;
    },
    async putIntent(row) {
      await db().exec(
        "INSERT INTO wrn_payment_intent (id,subject,gateway,gateway_ref,amount,currency,idempotency_key,created_at,checkout_url,client_json,metadata_json) VALUES (?,?,?,?,?,?,?,?,?,?,?)",
        [
          row.id,
          row.subject,
          row.gateway,
          row.gatewayRef,
          row.amount,
          row.currency,
          row.idempotencyKey,
          row.createdAt,
          row.checkoutUrl ?? null,
          JSON.stringify(row.client),
          JSON.stringify(row.metadata),
        ],
      );
    },
    async getIntent(id) {
      const row = await db().one("SELECT * FROM wrn_payment_intent WHERE id = ?", [id]);
      return row ? intent(row) : null;
    },
    async listIntents(filter = {}) {
      const clauses: string[] = [],
        values: unknown[] = [];
      if (filter.subject) {
        clauses.push("subject = ?");
        values.push(filter.subject);
      }
      if (filter.gateway) {
        clauses.push("gateway = ?");
        values.push(filter.gateway);
      }
      return (
        await db().all(
          `SELECT * FROM wrn_payment_intent${clauses.length ? ` WHERE ${clauses.join(" AND ")}` : ""} ORDER BY created_at DESC`,
          values,
        )
      ).map(intent);
    },
    async appendEvent(row) {
      try {
        const result = await db().exec(
          "INSERT INTO wrn_payment_event (id,intent_id,type,status,created_at,occurred_at,gateway_sequence,payload_json) VALUES (?,?,?,?,?,?,?,?) ON CONFLICT(id) DO NOTHING",
          [
            row.id,
            row.intentId,
            row.type,
            row.status,
            row.at,
            row.occurredAt ?? row.at,
            row.sequence === undefined ? null : String(row.sequence),
            JSON.stringify(row.payload ?? null),
          ],
        );
        return result.changes > 0;
      } catch {
        return false;
      }
    },
    async events(id) {
      return (
        await db().all<any>(
          "SELECT * FROM wrn_payment_event WHERE intent_id = ? ORDER BY occurred_at ASC, gateway_sequence ASC, id ASC",
          [id],
        )
      ).map((row) => ({
        id: String(row.id),
        intentId: String(row.intent_id),
        type: String(row.type),
        status: row.status,
        at: Number(row.created_at),
        occurredAt: Number(row.occurred_at ?? row.created_at),
        sequence: row.gateway_sequence == null ? undefined : String(row.gateway_sequence),
        payload: parse(row.payload_json, null),
      }));
    },
    async reserveRefund(row, captured) {
      try {
        const result = await db().exec(
          "INSERT INTO wrn_payment_refund (id,intent_id,gateway_ref,amount,currency,reason,idempotency_key,status,created_at) SELECT ?,?,?,?,?,?,?,?,? WHERE ? >= COALESCE((SELECT SUM(amount) FROM wrn_payment_refund WHERE intent_id = ? AND status <> 'failed'),0) + ?",
          [
            row.id,
            row.intentId,
            row.gatewayRef,
            row.amount,
            row.currency,
            row.reason,
            row.idempotencyKey,
            row.status,
            row.createdAt,
            captured,
            row.intentId,
            row.amount,
          ],
        );
        return result.changes > 0;
      } catch {
        return false;
      }
    },
    async updateRefund(id, status, gatewayRef) {
      await db().exec("UPDATE wrn_payment_refund SET status = ?, gateway_ref = ? WHERE id = ?", [
        status,
        gatewayRef,
        id,
      ]);
    },
    async refunds(id) {
      return (
        await db().all("SELECT * FROM wrn_payment_refund WHERE intent_id = ? ORDER BY created_at", [
          id,
        ])
      ).map(refund);
    },
    async methods(subject) {
      return (
        await db().all<any>(
          "SELECT * FROM wrn_payment_method WHERE subject = ? ORDER BY is_default DESC, created_at",
          [subject],
        )
      ).map((row) => ({
        id: String(row.id),
        subject: String(row.subject),
        gateway: String(row.gateway),
        gatewayRef: String(row.gateway_ref),
        brand: row.brand ? String(row.brand) : undefined,
        last4: row.last4 ? String(row.last4) : undefined,
        expires: row.expires ? String(row.expires) : undefined,
        default: Boolean(row.is_default),
      }));
    },
    async getMethod(id) {
      const row = await db().one<any>("SELECT * FROM wrn_payment_method WHERE id = ?", [id]);
      return row
        ? {
            id: String(row.id),
            subject: String(row.subject),
            gateway: String(row.gateway),
            gatewayRef: String(row.gateway_ref),
            brand: row.brand ? String(row.brand) : undefined,
            last4: row.last4 ? String(row.last4) : undefined,
            expires: row.expires ? String(row.expires) : undefined,
            default: Boolean(row.is_default),
          }
        : null;
    },
    async putMethod(row) {
      await db().exec(
        "INSERT INTO wrn_payment_method (id,subject,gateway,gateway_ref,brand,last4,expires,is_default,created_at) VALUES (?,?,?,?,?,?,?,?,?)",
        [
          row.id,
          row.subject,
          row.gateway,
          row.gatewayRef,
          row.brand ?? null,
          row.last4 ?? null,
          row.expires ?? null,
          row.default ? 1 : 0,
          Date.now(),
        ],
      );
    },
    async removeMethod(id) {
      await db().exec("DELETE FROM wrn_payment_method WHERE id = ?", [id]);
    },
    async defaultMethod(subject, id) {
      await db().tx(async (tx) => {
        await tx.exec("UPDATE wrn_payment_method SET is_default = 0 WHERE subject = ?", [subject]);
        await tx.exec("UPDATE wrn_payment_method SET is_default = 1 WHERE subject = ? AND id = ?", [
          subject,
          id,
        ]);
      });
    },
  };
}