1 files changed, 71 insertions, 0 deletions
diff --git a/deimos/core/log.h b/deimos/core/log.h
new file mode 100644
index 0000000..cf92391
--- /dev/null
+++ b/deimos/core/log.h
@@ -0,0 +1,71 @@
+#pragma once
+
+#include "deimos/core/base.h"
+#include "deimos/core/id_name.h"
+#include "deimos/core/format.h"
+
+namespace deimos
+{
+
+enum class LogSeverity
+{
+    kInfo,
+    kDebug,
+    kError,
+};
+
+class ILogger
+{
+public:
+    ILogger() = default;
+    deimos_NO_COPY_MOVE(ILogger);
+    virtual ~ILogger() = default;
+
+    // @Todo Use string view
+    virtual void Log(LogSeverity, const SourceLocation&, Span<const char>) = 0;
+};
+
+// Just a helper to pass a SourceLocation without having to write {} to logging functions.
+struct LogSourceLocation
+{
+    gsl::czstring       fmt;
+    SourceLocation      source_location;
+
+    // NOLINTNEXTLINE(*-explicit-conversions)
+    LogSourceLocation(gsl::czstring fmt_, const SourceLocation& source_location_ = {}) :
+        fmt{fmt_}, source_location{source_location_}
+    {}
+};
+
+class LogApi
+{
+public:
+    static constexpr IdName kApiName{"deimos::LogApi"};
+
+    LogApi() = default;
+    deimos_NO_COPY_MOVE(LogApi);
+    virtual ~LogApi() = default;
+
+    virtual void LogVa(LogSeverity, const SourceLocation&, gsl::czstring msg, Span<const FormatArg>) = 0;
+
+    template<Formattable... Args>
+    void LogInfo(const LogSourceLocation& fmt_source_location, Args&&... args)
+    {
+        LogVa(LogSeverity::kInfo, fmt_source_location.source_location, fmt_source_location.fmt, { FormatArg(std::forward<Args>(args))... });
+    }
+
+    template<Formattable... Args>
+    void LogDebug(const LogSourceLocation& fmt_source_location, Args&&... args)
+    {
+        LogVa(LogSeverity::kDebug, fmt_source_location.source_location, fmt_source_location.fmt, { FormatArg(std::forward<Args>(args))... });
+    }
+
+    template<Formattable... Args>
+    void LogError(const LogSourceLocation& fmt_source_location, Args&&... args)
+    {
+        LogVa(LogSeverity::kError, fmt_source_location.source_location, fmt_source_location.fmt, { FormatArg(std::forward<Args>(args))... });
+    }
+};
+
+} // namespace deimos
+