# Copyright (c) 2025 Dominic Masters
# 
# This software is released under the MIT License.
# https://opensource.org/licenses/MIT

set(LIBZIP_ALLOW_FETCH ON CACHE BOOL "Allow fetching libzip if not found")
set(LIBZIP_FETCH_GIT_REPO "https://github.com/nih-at/libzip.git" CACHE STRING "libzip Git repository")
set(LIBZIP_FETCH_GIT_TAG  "v1.11.1" CACHE STRING "libzip Git tag to fetch")
set(LIBZIP_MIN_VERSION "" CACHE STRING "Required minimum libzip version (optional)")

unset(LIBZIP_FOUND CACHE)
unset(LIBZIP_TARGET CACHE)
unset(LIBZIP_INCLUDE_DIRS CACHE)
unset(LIBZIP_LIBRARIES CACHE)

set(_find_args CONFIG QUIET)
if(LIBZIP_MIN_VERSION)
  list(PREPEND _find_args ${LIBZIP_MIN_VERSION})
endif()

find_package(libzip ${_find_args})

if(TARGET libzip::zip)
  set(LIBZIP_FOUND ON)
  set(LIBZIP_TARGET libzip::zip)
elseif(TARGET zip) # some builds expose an un-namespaced "zip"
  add_library(libzip::zip ALIAS zip)
  set(LIBZIP_FOUND ON)
  set(LIBZIP_TARGET libzip::zip)
endif()

if(NOT LIBZIP_FOUND)
  find_package(PkgConfig QUIET)
  if(PkgConfig_FOUND)
    pkg_check_modules(LIBZIP_PC QUIET libzip)
    if(LIBZIP_PC_FOUND)
      # Create a consistent imported target matching libzip::zip
      add_library(libzip::zip INTERFACE IMPORTED)
      set_target_properties(libzip::zip PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${LIBZIP_PC_INCLUDE_DIRS}"
        INTERFACE_LINK_LIBRARIES      "${LIBZIP_PC_LINK_LIBRARIES}"
      )
      set(LIBZIP_FOUND ON)
      set(LIBZIP_TARGET libzip::zip)
      set(LIBZIP_INCLUDE_DIRS "${LIBZIP_PC_INCLUDE_DIRS}")
      set(LIBZIP_LIBRARIES "${LIBZIP_PC_LINK_LIBRARIES}")
    endif()
  endif()
endif()

# ---- 3) FetchContent as a last resort ---------------------------------------
if(NOT LIBZIP_FOUND AND LIBZIP_ALLOW_FETCH)
  include(FetchContent)

  set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
  set(LIBZIP_DO_INSTALL OFF CACHE BOOL "" FORCE)
  set(ENABLE_BZIP2 OFF CACHE BOOL "" FORCE)
  set(ENABLE_LZMA OFF CACHE BOOL "" FORCE)
  set(ENABLE_ZSTD OFF CACHE BOOL "" FORCE)

  FetchContent_Declare(
    libzip_fetch
    GIT_REPOSITORY "${LIBZIP_FETCH_GIT_REPO}"
    GIT_TAG        "${LIBZIP_FETCH_GIT_TAG}"
  )
  FetchContent_MakeAvailable(libzip_fetch)

  if(NOT TARGET libzip::zip)
    if(TARGET zip)
      add_library(libzip::zip ALIAS zip)
    endif()
  endif()

  if(TARGET libzip::zip)
    set(LIBZIP_FOUND ON)
    set(LIBZIP_TARGET libzip::zip)
  else()
    message(FATAL_ERROR "libzip fetch succeeded but target 'libzip::zip' (or 'zip') was not created.")
  endif()
endif()

# Final guard
if(NOT LIBZIP_FOUND)
  message(FATAL_ERROR "libzip not found and fetching is disabled or failed. "
                      "Set LIBZIP_ALLOW_FETCH=ON or install libzip development files.")
endif()