// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:build mage
// +build mage

package main

import (
	"context"
	"errors"
	"fmt"
	"os"
	"os/exec"
	"strings"

	"github.com/magefile/mage/mg"

	"github.com/livekit/livekit-server/version"
	"github.com/livekit/mageutil"
	_ "github.com/livekit/psrpc"
)

const (
	goChecksumFile = ".checksumgo"
	imageName      = "livekit/livekit-server"
)

// Default target to run when none is specified
// If not set, running mage will list available targets
var (
	Default     = Build
	checksummer = mageutil.NewChecksummer(".", goChecksumFile, ".go", ".mod")
)

func init() {
	checksummer.IgnoredPaths = []string{
		"pkg/service/wire_gen.go",
		"pkg/rtc/types/typesfakes",
	}
}

// downloads module deps at the versions pinned in go.mod
//
// Code generators are not installed here: they run as `go run <pkg>` from their
// //go:generate directives (see pkg/service/wire_gen.go and the counterfeiter
// directives under pkg/), so they always execute at the version go.mod pins and
// Renovate keeps them current alongside every other module.
func Deps() error {
	return mageutil.Run(context.Background(), "go mod download")
}

// builds LiveKit server
func Build() error {
	mg.Deps(generateWire)
	if !checksummer.IsChanged() {
		fmt.Println("up to date")
		return nil
	}

	fmt.Println("building...")
	if err := os.MkdirAll("bin", 0755); err != nil {
		return err
	}
	if err := mageutil.RunDir(context.Background(), "cmd/server", "go build -o ../../bin/livekit-server"); err != nil {
		return err
	}

	checksummer.WriteChecksum()
	return nil
}

// builds binary that runs on linux
func BuildLinux() error {
	mg.Deps(generateWire)
	if !checksummer.IsChanged() {
		fmt.Println("up to date")
		return nil
	}

	fmt.Println("building...")
	if err := os.MkdirAll("bin", 0755); err != nil {
		return err
	}
	buildArch := os.Getenv("GOARCH")
	if len(buildArch) == 0 {
		buildArch = "amd64"
	}
	cmd := mageutil.CommandDir(context.Background(), "cmd/server", "go build -buildvcs=false -o ../../bin/livekit-server-" + buildArch)
	cmd.Env = []string{
		"GOOS=linux",
		"GOARCH=" + buildArch,
		"HOME=" + os.Getenv("HOME"),
		"GOPATH=" + os.Getenv("GOPATH"),
	}
	if err := cmd.Run(); err != nil {
		return err
	}

	checksummer.WriteChecksum()
	return nil
}

func Deadlock() error {
	ctx := context.Background()
	if err := mageutil.Run(ctx, "go get github.com/sasha-s/go-deadlock"); err != nil {
		return err
	}
	if err := mageutil.Pipe("grep -rl sync.Mutex ./pkg", "xargs sed -i  -e s/sync.Mutex/deadlock.Mutex/g"); err != nil {
		return err
	}
	if err := mageutil.Pipe("grep -rl sync.RWMutex ./pkg", "xargs sed -i  -e s/sync.RWMutex/deadlock.RWMutex/g"); err != nil {
		return err
	}
	if err := mageutil.Pipe("grep -rl deadlock.Mutex\\|deadlock.RWMutex ./pkg", "xargs go tool goimports -w"); err != nil {
		return err
	}
	if err := mageutil.Run(ctx, "go mod tidy"); err != nil {
		return err
	}
	return nil
}

func Sync() error {
	if err := mageutil.Pipe("grep -rl deadlock.Mutex ./pkg", "xargs sed -i  -e s/deadlock.Mutex/sync.Mutex/g"); err != nil {
		return err
	}
	if err := mageutil.Pipe("grep -rl deadlock.RWMutex ./pkg", "xargs sed -i  -e s/deadlock.RWMutex/sync.RWMutex/g"); err != nil {
		return err
	}
	if err := mageutil.Pipe("grep -rl sync.Mutex\\|sync.RWMutex ./pkg", "xargs go tool goimports -w"); err != nil {
		return err
	}
	if err := mageutil.Run(context.Background(), "go mod tidy"); err != nil {
		return err
	}
	return nil
}

// builds and publish snapshot docker image
func PublishDocker() error {
	// don't publish snapshot versions as latest or minor version
	if !strings.Contains(version.Version, "SNAPSHOT") {
		return errors.New("Cannot publish non-snapshot versions")
	}

	versionImg := fmt.Sprintf("%s:v%s", imageName, version.Version)
	cmd := exec.Command("docker", "buildx", "build",
		"--push", "--platform", "linux/amd64,linux/arm64",
		"--tag", versionImg,
		".")
	mageutil.ConnectStd(cmd)
	if err := cmd.Run(); err != nil {
		return err
	}
	return nil
}

// run unit tests, skipping integration
func Test() error {
	mg.Deps(generateWire, setULimit)
	return mageutil.Run(context.Background(), "go test -short ./... -count=1")
}

// run all tests including integration
func TestAll() error {
	mg.Deps(generateWire, setULimit)
	return mageutil.Run(context.Background(), "go test ./... -count=1 -timeout=4m -v")
}

// runs the SDK test server (cmd/test-server) in the foreground
func TestServer() error {
	return mageutil.Run(context.Background(), "go run ./cmd/test-server")
}

// runs golangci-lint
func Lint() error {
	if _, err := exec.LookPath("golangci-lint"); err != nil {
		return errors.New("golangci-lint is not installed, install instructions: https://golangci-lint.run/docs/welcome/install/")
	}
	return mageutil.Run(context.Background(), "golangci-lint run ./...")
}

// cleans up builds
func Clean() {
	fmt.Println("cleaning...")
	os.RemoveAll("bin")
	os.Remove(goChecksumFile)
}

// regenerate code
func Generate() error {
	mg.Deps(generateWire)

	fmt.Println("generating...")
	return mageutil.Run(context.Background(), "go generate ./...")
}

// code generation for wiring
func generateWire() error {
	if !checksummer.IsChanged() {
		return nil
	}

	fmt.Println("wiring...")

	// Matches the //go:generate directive in pkg/service/wire_gen.go, so running
	// wire here and running `go generate ./...` produce the same output.
	return mageutil.RunDir(context.Background(), "pkg/service", "go run github.com/google/wire/cmd/wire")
}
