ENV_PYTHONPATH              := $(PYTHONPATH)

# note: This is redundant to projects.mk
ifneq ($(PYTHON_VERSION),)
  PYTHON                    := /usr/bin/python$(PYTHON_VERSION)
else
  ifeq ($(PYTHON),)
    PYTHON                  := $(lastword $(shell /bin/bash -O extglob -c "ls -v /usr/bin/python[0-9].+([0-9])"))
  endif
  PYTHON_VERSION            ?= $(patsubst python%,%,$(notdir $(PYTHON)))
endif
PYTHON_MAJOR                 = $(basename $(PYTHON_VERSION))

ifeq ($(DEVELOPMENT),true)
  PY_SITE_PACKAGES_PATH     := $(PREFIX)/python$(PYTHON_VERSION)/site-packages
else
  PY_SITE_PACKAGES_PATH     := $(shell $(PYTHON) -c "import site; print([d for d in site.getsitepackages() if d.find('/local/') == -1][0])")
endif

ifndef PY_PREREQ_BUILD
  PY_PREREQ_BUILD           := $(shell $(proj_query_cmd) pkg-requires --subsections jw -d ' ' -p --no-version build $(PROJECT))
endif

ifndef PY_PREREQ_BUILD_DIRS
  PY_PREREQ_BUILD_DIRS      := $(shell $(proj_query_cmd) proj-dir $(PY_PREREQ_BUILD))
endif

PY_MYPY                     ?= mypy --ignore-missing-imports --no-namespace-packages

PY_SRC_PY                   ?= $(wildcard *.py)
PY_ALL_PY                    = $(PY_SRC_PY)

ifneq ($(PYTHON_MAJOR),3)
  PY_PYC                     = $(patsubst %.py,%.pyc,$(PY_ALL_PY))
else
  PY_CPYTHON_PREFIX         := $(shell $(PYTHON) -c "import sys; print('cpython-{}{}'.format(sys.version_info[0],sys.version_info[1]))")
  PY_PYC                     = $(patsubst %.py,__pycache__/%.$(PY_CPYTHON_PREFIX).pyc,$(PY_ALL_PY))
endif

ifneq ($(PY_INSTALL_DIR),)
  PY_INSTALL_DIR_PY         ?= $(PY_INSTALL_DIR)
endif

# deduce PY_INSTALL_DIR_PY from working directory below .. python/
ifeq ($(PY_INSTALL_DIR_PY),)
  PY_INSTALL_PKG_MOD        ?= $(shell $(ECHO) $(CWD) | $(SED) 's%.*/python/%%; s%/.*%%')
  PY_INSTALL_SUB_MOD        ?= $(shell $(ECHO) $(CWD) | $(SED) "s%.*/$(PY_INSTALL_PKG_MOD)\(/\|$$\)%%")
  ifneq ($(PY_INSTALL_SUB_MOD),)
    PY_INSTALL_MOD          ?= $(PY_INSTALL_PKG_MOD)/$(PY_INSTALL_SUB_MOD)
  else
    PY_INSTALL_MOD          ?= $(PY_INSTALL_PKG_MOD)
  endif
  PY_MOD                    ?= $(subst /,.,$(PY_INSTALL_MOD))
  PY_ALL_PY                 += __init__.py
  PY_INSTALL_DIR_PY         ?= $(ENV_PREFIX)$(PY_SITE_PACKAGES_PATH)/$(patsubst .,/,$(PY_INSTALL_MOD))
else
  ifeq ($(PY_INSTALL_DIR_PY),)
    $(error PY_INSTALL_DIR_PY is undefined)
  endif
endif

ifeq ($(PYTHON_MAJOR),3)
  PY_INSTALL_DIR_PYC        ?= $(PY_INSTALL_DIR_PY)/__pycache__
else
  PY_INSTALL_DIR_PYC        ?= $(PY_INSTALL_DIR_PY)
endif

PY_INSTALL_DIRS             ?= $(sort $(PY_INSTALL_DIR_PY) $(PY_INSTALL_DIR_PYC))
PY_INSTALLED_PY              = $(addprefix $(PY_INSTALL_DIR_PY)/,$(sort $(PY_ALL_PY)))
PY_INSTALLED_PYC             = $(addprefix $(PY_INSTALL_DIR_PY)/,$(PY_PYC))
PY_INSTALLED_REG             = $(PY_INSTALLED_PY) $(PY_INSTALLED_PYC)

PYTHONPATH                  ?= $(call proj_query, pythonpath $(PROJECT) $(PY_PREREQ_RUN))
#PYTHONPATH                  = $(subst $(space),,$(ENV_PYTHONPATH)$(foreach d,$(PY_MODULE_DIRS),:$(d)))
MYPYPATH                     = $(PYTHONPATH)
export PYTHONPATH MYPYPATH

# not used anywhere
#PY_PROJ_MODULE_DIRS        ?= $(wildcard $(foreach subdir,/tools/python /src/python,$(addsuffix $(subdir),$(TOPDIR) $(PY_PREREQ_BUILD_DIRS))))
#PY_MODULE_DIRS             ?= $(PY_PROJ_MODULE_DIRS)
#PY_MODULES                 ?= $(PY_PROJ_MODULES)
#PY_PROJ_MODULES            += $(dir $(wildcard $(PY_MODULE_DIRS)/*/__init__.py))

ifneq ($(PY_DEFS_MK_INCLUDED),true)
all:
clean: pyc.clean

echo-py:
	@echo "PY_INSTALL_DIR_PY       = $(PY_INSTALL_DIR_PY)"
	@echo "PROJECT                 = $(PROJECT)"
	@echo "PY_SITE_PACKAGES_PATH   = $(PY_SITE_PACKAGES_PATH)"
	@echo "PY_MODULES              = $(PY_MODULES)"
	@echo "PYTHONPATH              = $(PYTHONPATH)"
	@echo "MYPYPATH                = $(MYPYPATH)"
	@echo "PY_INSTALL_MOD          = $(PY_INSTALL_MOD)"
	@echo "PY_INSTALL_SUB_MOD      = $(PY_INSTALL_SUB_MOD)"
	# not used anywhere"
	#@echo "PY_PROJ_MODULE_DIRS    = $(PY_PROJ_MODULE_DIRS)"
	#@echo "PY_MODULE_DIRS         = $(PY_MODULE_DIRS)"

pyc.clean:
	$(RM) -rf $(wildcard *.pyc) __pycache__
libpath: py-libpath
py-libpath:
	@echo export PYTHONPATH=$(PYTHONPATH)
	@echo export MYPYPATH=$(MYPYPATH)
endif

PY_DEFS_MK_INCLUDED         := true

include $(JWBDIR)/make/ldlibpath.mk