package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"go.wit.com/lib/gui/shell"
	"go.wit.com/lib/protobuf/gitpb"
	"go.wit.com/log"
)

func buildPackage(repo *gitpb.Repo) (bool, error) {
	// TODO: if dirty, set GO111MODULE
	// also, if last tag != version
	/*
		go install -ldflags " \
			-X main.GITCOMMIT=${GITCOMMIT} \
			-X main.GOVERSION='${GOVERSION}' \
			-X main.BUILDTIME='${BUILDTIME}' \
			-X main.VERSION=${VERSION}"
	*/
	// ldflags := "main.GOTAG=" + repo.LastTag()

	filename := repo.Control["Package"] // c.Package.String()
	if filename == "" {
		return false, errors.New("filename is blank")
	}

	arch := repo.Control["Architecture"] // c.Architecture.String()
	if arch == "" {
		arch = "amd64" // todo: detect what you are building on
	}
	version := repo.Control["Version"]
	log.Info("version is:", version)
	debname := filename + "_" + version + "_" + arch + ".deb"
	var fulldebname string
	if argv.OutDir == "" {
		fulldebname = debname
	} else {
		fulldebname = filepath.Join(argv.OutDir, debname)
	}
	if shell.Exists(fulldebname) {
		log.Info("debian package already built: " + fulldebname)
		return true, errors.New("debian package already built: " + fulldebname)

	}

	var fullfilename string
	_, fullfilename = filepath.Split(filename)

	if fullfilename == "" {
		log.Info("fullfilename =", fullfilename)
		badExit(log.Errorf("binary name was blank"))
	}
	if fullfilename == "." {
		log.Info("fullfilename =", fullfilename)
		badExit(log.Errorf("binary name was ."))
	}
	if shell.Exists(fullfilename) {
		repo.RunVerbose([]string{"rm", "-f", fullfilename})
	}

	if shell.Exists(fullfilename) {
		// something wrong
		return false, errors.New("binary existed before build")
	}

	if argv.Release {
		os.Unsetenv("GO111MODULE")
		cmd := []string{"go"}
		cmd = append(cmd, "install")
		if argv.Verbose {
			cmd = append(cmd, "-v")
			cmd = append(cmd, "-x")
		}
		/*
			cmd = append(cmd, "some path"+"@v"+version)
			if err := shell.PathExecVerbose("", cmd); err != nil {
				badExit(err)
				return false, fmt.Errorf("go build err %v", err)
			}
		*/
		cmd = []string{"go"}
		cmd = append(cmd, "build")
		if argv.Verbose {
			cmd = append(cmd, "-v")
			cmd = append(cmd, "-x")
		}
		cmd = append(cmd, "this should be the path")
		if err := shell.PathExecVerbose("", cmd); err != nil {
			badExit(err)
			return false, fmt.Errorf("go build err %v", err)
		}
		log.Warn("build worked")
	} else {
		// set the GO111 build var to true. pass the versions to the compiler manually
		os.Setenv("GO111MODULE", "off")
		cmd := []string{"go", "build"}
		// set standard ldflag options
		now := time.Now()
		datestamp := now.UTC().Format("2006/01/02_1504_UTC")
		log.Info("datestamp =", datestamp)
		// add some standard golang flags
		ldflags := "-X main.VERSION=" + version + " "
		ldflags += "-X main.BUILDTIME=" + datestamp + " "
		ldflags += "-X main.GUIVERSION=" + version + "" // todo: git this from the filesystem
		cmd = append(cmd, "-ldflags", ldflags)

		// add any flags from the command line
		// this might not actually work
		// todo: test this
		for _, flag := range argv.Ldflags {
			cmd = append(cmd, "-ldflags", "-X "+flag)
		}

		err := repo.RunVerbose(cmd)
		if err != nil {
			return false, fmt.Errorf("go build err %v", err)
		}
		log.Warn("go build worked")
	}

	filebase := filepath.Base(repo.Control["pathL"]) // c.pathL.String())
	if fullfilename != filebase {
		// this exception is for when you want to override a package name
		// sometimes that's the best option. This way you can keep your
		// name, but the .deb package name can be different so you can
		// still apt-get it. For an example, look at the gozookeeper package
		fullfilename = filebase
	}

	if !shell.Exists(fullfilename) {
		log.Warn("build failed. filename does not exist", fullfilename)
		return false, errors.New("missing " + fullfilename)
	}

	if shell.Exists("files") {
		repo.RunVerbose([]string{"rm", "-rf", "files"})
		// log.Info("running sync")
		repo.RunVerbose([]string{"sync"})
		if shell.Exists("files") {
			log.Warn("rm failed for some reason")
			return false, errors.New("rm files/")
		}
	}
	repo.RunVerbose([]string{"sync"}) // for some reason the next check fails sometimes?
	if shell.Exists("files") {
		// probably the 'shell' package id being stupid and not waiting for the process to actually exit
		log.Warn("rm failed. files/ still exists. is golang doing these in parallel?")
		return false, errors.New("rm files/")
	}
	if err := os.MkdirAll("files/DEBIAN", os.ModePerm); err != nil {
		return false, errors.New("mkdir files/DEBIAN")
	}
	if err := os.MkdirAll("files/usr/bin", os.ModePerm); err != nil {
		log.Warn("mkdir failed")
		return false, errors.New("mkdir files/usr/bin")
	}
	if os.Getenv("GO_DEB_CUSTOM") == "true" {
		// skip cp & strip on custom 'control' files
		// probably deprecate this
		log.Info("REPO GO_DEB_CUSTOM=true means binary is not copied")
	} else {
		_, fname := filepath.Split(repo.GetFullPath())
		cmd := []string{"cp", fname, "files/usr/bin"}
		log.Info("REPO FILENAME cp", cmd)
		if err := repo.RunVerbose(cmd); err != nil {
			log.Warn("cp failed")
			return false, err
		}
		cmd = []string{"strip", "files/usr/bin/" + fname}
		if err := repo.RunVerbose(cmd); err != nil {
			log.Warn("strip failed")
			return false, err
		}
	}

	// put the README in there (if missing, generate it?)
	var readme string = ""
	if shell.Exists("README.md") {
		readme = "README.md"
	}

	if shell.Exists("README") {
		readme = "README"
	}

	if readme != "" {
		path := filepath.Join("files/usr/lib/" + filename)
		if err := os.MkdirAll(path, os.ModePerm); err != nil {
			return false, errors.New("no files/usr/lib")
		}
		if err := repo.RunVerbose([]string{"cp", readme, path}); err != nil {
			return false, err
		}
	}

	if !writeDebianControlFile(repo) {
		return false, errors.New("write control file")
	}
	if shell.Exists("postinst") {
		repo.RunVerbose([]string{"cp", "postinst", "files/DEBIAN/"})
	}

	// experiment for the toolkit package
	// if the git repo has a "./build" script run it before packaging
	// this way the user can put custom files in the .deb package
	if shell.Exists("build") {
		log.Info(repo.FullPath, "FOUND ./build HERE")
		repo.RunVerbose([]string{"./build"})
	} else {
		log.Info(repo.FullPath, "NOT FOUND ./build HERE")
	}

	cmd := []string{"dpkg-deb", "--build", "files", fulldebname}
	result := repo.RunVerbose(cmd)
	if shell.Exists(fulldebname) {
	} else {
		log.Warn("CMD FAILED", cmd, result)
		log.Warn("build failed: full name was not created:", fulldebname)
		return false, errors.New("dpkg-deb --build failed")
	}
	repo.RunVerbose([]string{"dpkg-deb", "-I", fulldebname})
	repo.RunVerbose([]string{"dpkg-deb", "-c", fulldebname})

	// cleanup files
	if shell.Exists("files") {
		if argv.KeepFiles {
			log.Info("keeping the build files/")
		} else {
			repo.RunVerbose([]string{"rm", "-rf", "files"})
			// log.Info("running sync")
			repo.RunVerbose([]string{"sync"})
			if shell.Exists("files") {
				log.Warn("rm -rf files/ failed. Run() returned false")
				return false, errors.New("rm files/")
			}
		}
	}
	return true, nil
}