Update IemApiProvider to use template functions

wxdata/include/scwx/provider/iem_api_provider.ipp

@@ -0,0 +1,95 @@
+#pragma once
+
+#include <scwx/provider/iem_api_provider.hpp>
+#include <scwx/network/cpr.hpp>
+
+#include <cpr/cpr.h>
+#include <range/v3/view/cartesian_product.hpp>
+#include <range/v3/view/single.hpp>
+
+#if (__cpp_lib_chrono < 201907L)
+#   include <date/date.h>
+#endif
+
+namespace scwx::provider
+{
+
+template<ranges::forward_range DateRange,
+         ranges::forward_range CcccRange,
+         ranges::forward_range PilRange>
+   requires std::same_as<ranges::range_value_t<DateRange>,
+                         std::chrono::sys_days> &&
+            std::same_as<ranges::range_value_t<CcccRange>, std::string_view> &&
+            std::same_as<ranges::range_value_t<PilRange>, std::string_view>
+boost::outcome_v2::result<std::vector<types::iem::AfosEntry>>
+IemApiProvider::ListTextProducts(DateRange dates,
+                                 CcccRange ccccs,
+                                 PilRange  pils)
+{
+   using namespace std::chrono;
+
+#if (__cpp_lib_chrono >= 201907L)
+   namespace df = std;
+
+   static constexpr std::string_view kDateFormat {"{:%Y-%m-%d}"};
+#else
+   using namespace date;
+   namespace df = date;
+
+#   define kDateFormat "%Y-%m-%d"
+#endif
+
+   std::vector<cpr::AsyncResponse> asyncResponses {};
+
+   for (const auto& [date, cccc, pil] :
+        ranges::views::cartesian_product(dates, ccccs, pils))
+   {
+      auto parameters =
+         cpr::Parameters {{"date", df::format(kDateFormat, date)}};
+
+      // WMO Source Code
+      if (!cccc.empty())
+      {
+         parameters.Add({"cccc", std::string {cccc}});
+      }
+
+      // AFOS / AWIPS ID / 3-6 length identifier
+      if (!pil.empty())
+      {
+         parameters.Add({"pil", std::string {pil}});
+      }
+
+      asyncResponses.emplace_back(
+         cpr::GetAsync(cpr::Url {kBaseUrl_ + kListNwsTextProductsEndpoint_},
+                       network::cpr::GetHeader(),
+                       parameters));
+   }
+
+   return ProcessTextProductLists(asyncResponses);
+}
+
+template<ranges::forward_range Range>
+   requires std::same_as<ranges::range_value_t<Range>, std::string>
+std::vector<std::shared_ptr<awips::TextProductFile>>
+IemApiProvider::LoadTextProducts(const Range& textProducts)
+{
+   auto parameters = cpr::Parameters {{"nolimit", "true"}};
+
+   std::vector<std::pair<std::string, cpr::AsyncResponse>> asyncResponses {};
+   asyncResponses.reserve(textProducts.size());
+
+   const std::string endpointUrl = kBaseUrl_ + kNwsTextProductEndpoint_;
+
+   for (const auto& productId : textProducts)
+   {
+      asyncResponses.emplace_back(
+         productId,
+         cpr::GetAsync(cpr::Url {endpointUrl + productId},
+                       network::cpr::GetHeader(),
+                       parameters));
+   }
+
+   return ProcessTextProductFiles(asyncResponses);
+}
+
+} // namespace scwx::provider