# ==============================================================================
# Findprotozero.cmake
# ==============================================================================
# This module fetches the protozero header-only protobuf reader library.
#
# Targets provided:
#   protozero::protozero - The protozero interface target
#
# Variables set:
#   protozero_FOUND       - TRUE if protozero is available
#   protozero_LIBRARIES   - The library target (protozero::protozero)
#   protozero_INCLUDE_DIR - Include directory for protozero headers
#   protozero_VERSION     - Version of protozero
# ==============================================================================

if (DEFINED _FINDPROTOZERO_INCLUDED)
    return()
endif()
set(_FINDPROTOZERO_INCLUDED TRUE)

if (DEFINED protozero_FIND_VERSION AND NOT protozero_FIND_VERSION STREQUAL "")
    set(PROTOZERO_VERSION "${protozero_FIND_VERSION}")
else()
    set(PROTOZERO_VERSION "1.8.1")
endif()

message(STATUS "Fetching protozero ${PROTOZERO_VERSION}")

include(FetchContent)

find_program(GIT_EXECUTABLE git)
if (NOT GIT_EXECUTABLE)
    message(FATAL_ERROR "Fetch with zip not supported.")
endif()

FetchContent_Declare(
    protozero
    GIT_REPOSITORY https://github.com/mapbox/protozero.git
    GIT_TAG        v${PROTOZERO_VERSION}
    SOURCE_SUBDIR  _unused  # no CMakeLists.txt here; skips add_subdirectory
)

# SOURCE_SUBDIR points to a non-existent directory so FetchContent_MakeAvailable
# skips add_subdirectory (protozero's tests/tools/docs are never configured).
FetchContent_MakeAvailable(protozero)

add_library(protozero INTERFACE)
target_include_directories(protozero SYSTEM INTERFACE "${protozero_SOURCE_DIR}/include")
add_library(protozero::protozero ALIAS protozero)

set(protozero_FOUND       TRUE)
set(protozero_LIBRARIES   protozero::protozero)
set(protozero_VERSION     "${PROTOZERO_VERSION}")
get_target_property(_protozero_inc protozero::protozero INTERFACE_INCLUDE_DIRECTORIES)
set(protozero_INCLUDE_DIR "${_protozero_inc}")

set(PROTOZERO_LICENSE_FILE "${protozero_SOURCE_DIR}/LICENSE" CACHE FILEPATH "Path to protozero license file")