# ==============================================================================
# Find spdlog
# ==============================================================================
# This module fetches the spdlog logging library.
#
# Targets provided:
#   spdlog::spdlog - The spdlog library target
#
# Variables set:
#   spdlog_FOUND       - TRUE if spdlog is available
#   spdlog_LIBRARIES   - The spdlog library target (spdlog::spdlog)
#   spdlog_INCLUDE_DIR - Include directories for spdlog
#   spdlog_VERSION     - Version of spdlog (if available)
# ==============================================================================

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

# Use the version passed to find_package(), or default to v1.17.0
# spdlog tags are prefixed with 'v', so prepend it if not already present
if (DEFINED spdlog_FIND_VERSION AND NOT spdlog_FIND_VERSION STREQUAL "")
    set(SPDLOG_VERSION "v${spdlog_FIND_VERSION}")
else()
    set(SPDLOG_VERSION "v1.17.0")
endif()

message(STATUS "Fetching spdlog ${SPDLOG_VERSION}")

include(FetchContent)

find_program(GIT_EXECUTABLE git)
if (GIT_EXECUTABLE)
    set(SPDLOG_FETCH_METHOD "GIT")
else()
    set(SPDLOG_FETCH_METHOD "ZIP")
endif()

if (SPDLOG_FETCH_METHOD STREQUAL "GIT")
    FetchContent_Declare(
        spdlog
        GIT_REPOSITORY https://github.com/gabime/spdlog.git
        GIT_TAG        ${SPDLOG_VERSION}
    )
else()
    FetchContent_Declare(
        spdlog
        URL https://github.com/gabime/spdlog/archive/refs/tags/${SPDLOG_VERSION}.zip
    )
endif()

FetchContent_MakeAvailable(spdlog)

if (NOT TARGET spdlog::spdlog)
    if (TARGET spdlog)
        add_library(spdlog::spdlog ALIAS spdlog)
    else()
        message(FATAL_ERROR "Could not fetch spdlog; no target spdlog or spdlog::spdlog available")
    endif()
endif()

set(spdlog_FOUND        TRUE)
set(spdlog_LIBRARIES    spdlog::spdlog)
set(spdlog_VERSION      "${SPDLOG_VERSION}")
get_target_property(_spdlog_inc spdlog::spdlog INTERFACE_INCLUDE_DIRECTORIES)
set(spdlog_INCLUDE_DIR  "${_spdlog_inc}")

# Mark spdlog includes as SYSTEM to suppress warnings from its headers
if (_spdlog_inc AND TARGET spdlog)
    set_target_properties(spdlog PROPERTIES
        INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${_spdlog_inc}"
    )
endif()

set(SPDLOG_LICENSE_FILE "${spdlog_SOURCE_DIR}/LICENSE" CACHE FILEPATH "Path to spdlog license file")