# In order to ensure make instructions fail if there is command that fails a pipe (ie: `go test ... | tee -a ./test_results.txt`)
# the value `-o pipefail` (or `set -o pipefail`) is added to each shell command that make runs
# otherwise in the example command pipe, only the exit code of `tee` is recorded instead of `go test` which can cause
# test to pass in CI when they should not.
SHELL = /bin/bash
.SHELLFLAGS = -o pipefail -c

SHELL_CASE_EXP = case "$$(uname -s)" in CYGWIN*|MINGW*|MSYS*) echo "true";; esac;
UNIX_SHELL_ON_WINDOWS := $(shell $(SHELL_CASE_EXP))

ifeq ($(UNIX_SHELL_ON_WINDOWS),true)
	# The "sed" transformation below is needed on Windows, since commands like `go list -f '{{ .Dir }}'`
	# return Windows paths and such paths are incompatible with other *nix tools, like `find`,
	# used by the Makefile shell.
	# The backslash needs to be doubled so its passed correctly to the shell.
	NORMALIZE_DIRS = sed -e 's/^/\\//' -e 's/://' -e 's/\\\\/\\//g' | sort
else
	NORMALIZE_DIRS = sort
endif

# SRC_ROOT is the top of the source tree.
SRC_ROOT := $(shell git rev-parse --show-toplevel)
# SRC_PARENT_DIR is the absolute path of source tree's parent directory
SRC_PARENT_DIR := $(shell dirname $(SRC_ROOT))

# build tags required by any component should be defined as an independent variables and later added to GO_BUILD_TAGS below
GO_BUILD_TAGS=""
# These ldflags allow the build tool to omit the symbol table, debug information, and the DWARF symbol table to downscale binary size.
GO_BUILD_LDFLAGS="-s -w"
GOTEST_TIMEOUT?= 600s
GOTEST_OPT?= -race -timeout $(GOTEST_TIMEOUT) -parallel 4 --tags=$(GO_BUILD_TAGS)
GOTEST_INTEGRATION_OPT?= -race -timeout 360s -parallel 4
GOTEST_OPT_WITH_COVERAGE = $(GOTEST_OPT) -coverprofile=coverage.txt -covermode=atomic
GOTEST_OPT_WITH_INTEGRATION=$(GOTEST_INTEGRATION_OPT) -tags=integration,$(GO_BUILD_TAGS)
GOTEST_OPT_WITH_INTEGRATION_COVERAGE=$(GOTEST_OPT_WITH_INTEGRATION) -coverprofile=integration-coverage.txt -covermode=atomic
GOCMD?= go
GOOS=$(shell $(GOCMD) env GOOS)
GOARCH=$(shell $(GOCMD) env GOARCH)
GOTESTARCH?=$(GOARCH)

# In order to help reduce toil related to managing tooling for the open telemetry collector
# this section of the makefile looks at only requiring command definitions to be defined
# as part of $(TOOLS_MOD_DIR)/tools.go, following the existing practice.
# Modifying the tools' `go.mod` file will trigger a rebuild of the tools to help
# ensure that all contributors are using the most recent version to make builds repeatable everywhere.
TOOLS_MOD_DIR    := $(SRC_ROOT)/internal/tools
TOOLS_MOD_REGEX  := "\s+_\s+\".*\""
TOOLS_PKG_NAMES  := $(shell grep -E $(TOOLS_MOD_REGEX) < $(TOOLS_MOD_DIR)/tools.go | tr -d " _\"")
TOOLS_BIN_DIR    := $(SRC_ROOT)/.tools
TOOLS_BIN_NAMES  := $(addprefix $(TOOLS_BIN_DIR)/, $(notdir $(TOOLS_PKG_NAMES)))
CHLOGGEN_CONFIG  := .chloggen/config.yaml

.PHONY: install-tools
install-tools: $(TOOLS_BIN_NAMES)

$(TOOLS_BIN_DIR):
	mkdir -p $@

$(TOOLS_BIN_NAMES): $(TOOLS_BIN_DIR) $(TOOLS_MOD_DIR)/go.mod
	cd $(TOOLS_MOD_DIR) && GOOS="" $(GOCMD) build -o $@ -trimpath $(filter %/$(notdir $@),$(TOOLS_PKG_NAMES))

ADDLICENSE          := $(TOOLS_BIN_DIR)/addlicense
MDLINKCHECK         := $(TOOLS_BIN_DIR)/markdown-link-check
MISSPELL            := $(TOOLS_BIN_DIR)/misspell -error
MISSPELL_CORRECTION := $(TOOLS_BIN_DIR)/misspell -w
LINT                := $(TOOLS_BIN_DIR)/golangci-lint
MULTIMOD            := $(TOOLS_BIN_DIR)/multimod
CHLOGGEN            := $(TOOLS_BIN_DIR)/chloggen
GOIMPORTS           := $(TOOLS_BIN_DIR)/goimports
PORTO               := $(TOOLS_BIN_DIR)/porto
CHECKFILE           := $(TOOLS_BIN_DIR)/checkfile
CROSSLINK           := $(TOOLS_BIN_DIR)/crosslink
GOJUNIT             := $(TOOLS_BIN_DIR)/go-junit-report
BUILDER             := $(TOOLS_BIN_DIR)/builder
GOVULNCHECK         := $(TOOLS_BIN_DIR)/govulncheck
GCI                 := $(TOOLS_BIN_DIR)/gci
GOTESTSUM           := $(TOOLS_BIN_DIR)/gotestsum
TESTIFYLINT         := $(TOOLS_BIN_DIR)/testifylint

GOTESTSUM_OPT?= --rerun-fails=1
TESTIFYLINT_OPT?= --enable-all --disable=float-compare,require-error,suite-subtest-run,encoded-compare

# BUILD_TYPE should be one of (dev, release).
BUILD_TYPE?=release

ALL_PKG_DIRS := $(shell $(GOCMD) list -f '{{ .Dir }}' ./... | $(NORMALIZE_DIRS))

ALL_SRC := $(shell find $(ALL_PKG_DIRS) -name '*.go' \
                                -not -path '*/third_party/*' \
                                -not -path '*/local/*' \
                                -type f | sort)

ALL_SRC_AND_SHELL := find . -type f \( -iname '*.go' -o -iname "*.sh" \) ! -path '**/third_party/*' | sort

# All source code and documents. Used in spell check.
ALL_SRC_AND_DOC_CMD := find $(ALL_PKG_DIRS) -name "*.md" -o -name "*.go" -o -name "*.yaml" -not -path '*/third_party/*' -type f | sort
ifeq ($(UNIX_SHELL_ON_WINDOWS),true)
	# Windows has a low limit, 8192 chars, to create a process. Workaround it by breaking it in smaller commands.
	MISSPELL_CMD := $(ALL_SRC_AND_DOC_CMD) | xargs -n 20 $(MISSPELL)
	MISSPELL_CORRECTION_CMD := $(ALL_SRC_AND_DOC_CMD) | xargs -n 20 $(MISSPELL_CORRECTION)
else
	ALL_SRC_AND_DOC := $(shell $(ALL_SRC_AND_DOC_CMD))
	MISSPELL_CMD := $(MISSPELL) $(ALL_SRC_AND_DOC)
	MISSPELL_CORRECTION_CMD := $(MISSPELL_CORRECTION) $(ALL_SRC_AND_DOC)
endif

# ALL_PKGS is used with 'go cover'
ALL_PKGS := $(shell $(GOCMD) list $(sort $(dir $(ALL_SRC))))

ADDLICENSE_CMD := $(ADDLICENSE) -s=only -y "" -c "The OpenTelemetry Authors"

pwd:
	@pwd

all-pkgs:
	@echo $(ALL_PKGS) | tr ' ' '\n' | sort

all-srcs:
	@echo $(ALL_SRC) | tr ' ' '\n' | sort

all-pkg-dirs:
	@echo $(ALL_PKG_DIRS) | tr ' ' '\n' | sort

.DEFAULT_GOAL := common

.PHONY: common
common: lint test

.PHONY: test
test: $(GOTESTSUM)
	$(GOTESTSUM) $(GOTESTSUM_OPT) --packages="./..." -- $(GOTEST_OPT)

.PHONY: test-with-cover
test-with-cover: $(GOTESTSUM)
	mkdir -p $(PWD)/coverage/unit
	$(GOTESTSUM) $(GOTESTSUM_OPT) --packages="./..." -- $(GOTEST_OPT) -cover -covermode=atomic -args -test.gocoverdir="$(PWD)/coverage/unit"

.PHONY: do-unit-tests-with-cover
do-unit-tests-with-cover: $(GOTESTSUM)
	@echo "running $(GOCMD) unit test ./... + coverage in `pwd`"
	$(GOTESTSUM) $(GOTESTSUM_OPT) --packages="./..." -- $(GOTEST_OPT_WITH_COVERAGE)
	$(GOCMD) tool cover -html=coverage.txt -o coverage.html

.PHONY: buildtest
buildtest:
ifneq (,$(wildcard ./*.go))
	GOARCH=$(GOTESTARCH) CGO_ENABLED=1 $(GOCMD) test -c -o builtunitetest.test
endif

.PHONY: runbuilttest
runbuilttest: $(GOTESTSUM)
ifneq (,$(wildcard ./builtunitetest.test))
	$(GOTESTSUM) --raw-command -- $(GOCMD) tool test2json -p "./..." -t ./builtunitetest.test -test.v -test.failfast -test.timeout $(GOTEST_TIMEOUT)
endif	

.PHONY: mod-integration-test
mod-integration-test: $(GOTESTSUM)
	@echo "running $(GOCMD) integration test ./... in `pwd`"
	$(GOTESTSUM) $(GOTESTSUM_OPT) --packages="./..." -- $(GOTEST_OPT_WITH_INTEGRATION)
	@if [ -e integration-coverage.txt ]; then \
		$(GOCMD) tool cover -html=integration-coverage.txt -o integration-coverage.html; \
	fi

.PHONY: do-integration-tests-with-cover
do-integration-tests-with-cover: $(GOTESTSUM)
	@echo "running $(GOCMD) integration test ./... + coverage in `pwd`"
	$(GOTESTSUM) $(GOTESTSUM_OPT) --packages="./..." -- $(GOTEST_OPT_WITH_INTEGRATION_COVERAGE)
	@if [ -e integration-coverage.txt ]; then \
		$(GOCMD) tool cover -html=integration-coverage.txt -o integration-coverage.html; \
	fi

.PHONY: benchmark
benchmark: $(GOTESTSUM)
	$(GOTESTSUM) $(GOTESTSUM_OPT) --packages="$(ALL_PKGS)" -- -bench=. -run=notests --tags=$(GO_BUILD_TAGS)

.PHONY: addlicense
addlicense: $(ADDLICENSE)
	@ADDLICENSEOUT=$$(for f in $$($(ALL_SRC_AND_SHELL)); do \
		`$(ADDLICENSE_CMD) "$$f" 2>&1`; \
	done); \
	if [ "$$ADDLICENSEOUT" ]; then \
		echo "$(ADDLICENSE) FAILED => add License errors:\n"; \
		echo "$$ADDLICENSEOUT\n"; \
		exit 1; \
	else \
		echo "Add License finished successfully"; \
	fi

.PHONY: checklicense
checklicense: $(ADDLICENSE)
	@licRes=$$(for f in $$($(ALL_SRC_AND_SHELL)); do \
		awk '/Copyright The OpenTelemetry Authors|generated|GENERATED/ && NR<=3 { found=1; next } END { if (!found) print FILENAME }' $$f; \
		awk '/SPDX-License-Identifier: Apache-2.0|generated|GENERATED/ && NR<=4 { found=1; next } END { if (!found) print FILENAME }' $$f; \
		$(ADDLICENSE_CMD) -check "$$f" 2>&1 || echo "$$f"; \
		done); \
	if [ -n "$${licRes}" ]; then \
		echo "license header checking failed:"; echo "$${licRes}"; \
		exit 1; \
	else \
		echo "Check License finished successfully"; \
	fi

.PHONY: checklinks
checklinks:
	command -v $(MDLINKCHECK) >/dev/null 2>&1 || { echo >&2 "$(MDLINKCHECK) not installed. Run 'npm install -g markdown-link-check'"; exit 1; }
	find . -name \*.md -print0 | xargs -0 -n1 \
		$(MDLINKCHECK) -q -c $(SRC_ROOT)/.github/workflows/check_links_config.json || true

.PHONY: fmt
fmt: $(GOIMPORTS)
	gofmt -w -s ./
	$(GOIMPORTS) -w -local github.com/open-telemetry/opentelemetry-collector-contrib ./

.PHONY: lint
lint: $(LINT) checklicense misspell
	$(LINT) run --allow-parallel-runners --verbose --build-tags integration --timeout=30m --path-prefix $(shell basename "$(CURDIR)")

.PHONY: govulncheck
govulncheck: $(GOVULNCHECK)
	$(GOVULNCHECK) ./...

.PHONY: tidy
tidy:
	rm -fr go.sum
	$(GOCMD) mod tidy -compat=1.22.0

.PHONY: toolchain
toolchain:
	$(GOCMD) get toolchain@none

.PHONY: misspell
misspell: $(TOOLS_BIN_DIR)/misspell
	@echo "running $(MISSPELL)"
	@$(MISSPELL_CMD)

.PHONY: misspell-correction
misspell-correction: $(TOOLS_BIN_DIR)/misspell
	$(MISSPELL_CORRECTION_CMD)

.PHONY: moddownload
moddownload:
	$(GOCMD) mod download

.PHONY: testifylint
testifylint: $(TESTIFYLINT)
	@echo "running $(TESTIFYLINT)"
	$(TESTIFYLINT) $(TESTIFYLINT_OPT) ./...

.PHONY: testifylint-fix
testifylint-fix:
	@$(MAKE) testifylint TESTIFYLINT_OPT="${TESTIFYLINT_OPT} --fix"

.PHONY: gci
gci: $(TOOLS_BIN_DIR)/gci
	@echo "running $(GCI)"
	@$(GCI) write -s standard -s default -s "prefix(github.com/open-telemetry/opentelemetry-collector-contrib)" $(ALL_SRC_AND_DOC)