# ==============================================================================
# Findzlib.cmake
# ==============================================================================
# This module fetches and builds the zlib compression library.
# https://github.com/madler/zlib
#
# Targets provided:
#   ZLIB::ZLIBSTATIC - Static library target
#
# Variables set:
#   zlib_FOUND        - TRUE if zlib is available
#   zlib_LIBRARIES    - The library target (ZLIB::ZLIBSTATIC)
#   zlib_INCLUDE_DIR  - Include directories for zlib
# ==============================================================================

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

if (DEFINED zlib_FIND_VERSION AND NOT zlib_FIND_VERSION STREQUAL "")
    set(ZLIB_TAG "v${zlib_FIND_VERSION}")
else()
    set(ZLIB_TAG "v1.3.2")
endif()

message(STATUS "Fetching zlib @ ${ZLIB_TAG}")

include(FetchContent)

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

FetchContent_Declare(
    zlib
    GIT_REPOSITORY https://github.com/madler/zlib.git
    GIT_TAG        ${ZLIB_TAG}
    GIT_SHALLOW    TRUE
    EXCLUDE_FROM_ALL
)

set(ZLIB_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)

FetchContent_MakeAvailable(zlib)

# zlib's CMakeLists provides ZLIB::ZLIBSTATIC for the static build
set(zlib_FOUND       TRUE)
set(zlib_LIBRARIES   ZLIB::ZLIBSTATIC)
set(zlib_INCLUDE_DIR "${zlib_SOURCE_DIR};${zlib_BINARY_DIR}")

set(ZLIB_LICENSE_FILE "${zlib_SOURCE_DIR}/LICENSE" CACHE FILEPATH "Path to zlib license file")