package main

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

	"github.com/go-cmd/cmd"
	"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")
	}

	homeDir, err := os.UserHomeDir()
	if err != nil {
		return false, err
	}

	arch := repo.Control["Architecture"] // c.Architecture.String()
	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
	if argv.Release {
		fullfilename = filepath.Join(homeDir, "go/bin", filename)
	} else {
		fullfilename = filename
	}
	shell.Run([]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 := shell.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") {
		shell.Run([]string{"rm", "-rf", "files"})
		// log.Info("running sync")
		shell.Run([]string{"sync"})
		if shell.Exists("files") {
			log.Warn("rm failed for some reason")
			return false, errors.New("rm files/")
		}
	}
	shell.Run([]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
	} else {
		if r := shell.Run([]string{"cp", fullfilename, "files/usr/bin"}); r.Error != nil {
			log.Warn("cp failed")
			return false, r.Error
		}
		if r := shell.Run([]string{"strip", "files/usr/bin/" + filename}); r.Error != nil {
			log.Warn("strip failed")
			return false, r.Error
		}
	}

	// 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 r := shell.Run([]string{"cp", readme, path}); r.Error != nil {
			return false, r.Error
		}
	}

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

	shell.Run([]string{"dpkg-deb", "--build", "files", fulldebname})
	if shell.Exists(fulldebname) {
	} else {
		log.Warn("build failed", fulldebname)
		return false, errors.New("dpkg-deb --build failed")
	}
	shell.Run([]string{"dpkg-deb", "-I", fulldebname})
	shell.Run([]string{"dpkg-deb", "-c", fulldebname})

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

func writeDebianControlFile(repo *gitpb.Repo) bool {
	cf, err := os.OpenFile("files/DEBIAN/control", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		log.Info("open control file failed", err)
		return false
	}
	fmt.Fprintln(cf, "Package:", repo.Control["Package"])           // c.Package.String())
	fmt.Fprintln(cf, "Source:", repo.Control["Source"])             // c.Source.String())
	fmt.Fprintln(cf, "Version:", repo.Control["Version"])           // c.Version.String())
	fmt.Fprintln(cf, "Architecture:", repo.Control["Architecture"]) // c.Architecture.String())

	writeControlVar(cf, repo, "Depends")
	writeControlVar(cf, repo, "Build-Depends")

	stamp := time.Now().UTC().Format("2006/01/02 15:04:05 UTC")
	// update to now now despite what the GUI is showing
	fmt.Fprintln(cf, "Package-Build-Date:", stamp)

	fmt.Fprintln(cf, "Git-Tag-Date:", "todo: get from repo")

	writeControlVar(cf, repo, "Maintainer")
	writeControlVar(cf, repo, "Packager")
	writeControlVar(cf, repo, "GoPath")
	writeControlVar(cf, repo, "URL")
	writeControlVar(cf, repo, "Conflicts")

	desc, _ := repo.Control["Description"] // c.Description.String()
	parts := strings.Split(desc, "\n")
	fmt.Fprintln(cf, "Description:", strings.Join(parts, "\n "))

	return true
}

func writeControlVar(f *os.File, repo *gitpb.Repo, varname string) {
	val, _ := repo.Control[varname]
	if val == "" {
		return
	}
	fmt.Fprintln(f, val+":", val)
}

// try to guess or figure out the config file values
// if there is not a control file
func computeControlValues(repo *gitpb.Repo) bool {
	if repo.Control["Package"] == "" {
		// get the package name from the repo name
		path := repo.Control["pathL"] // c.pathL.String()
		parts := strings.Split(path, "/")
		name := parts[len(parts)-1]
		repo.Control["Package"] = name
	}
	if repo.Control["Source"] == "" {
		repo.Control["Source"] = repo.Control["Package"]
	}
	if repo.Control["Build-Depends"] == "" {
		repo.Control["Build-Depends"] = repo.Control["golang"]
	}
	if repo.Control["Recommends"] == "" {
		repo.Control["Recommends"] = repo.Control["go-gui-toolkits"]
	}
	if repo.Control["Maintainer"] == "" {
		repo.Control["Maintainer"] = "todo: get from ENV"
	}
	if repo.Control["Description"] == "" {
		repo.Control["Description"] = "todo: put URL here"
	}
	return true
}

// stamp := time.Now().UTC().Format("2006/01/02 15:04:05 UTC")

func getDateStamp(tag string) string {
	var r cmd.Status
	if me.repo == nil {
		r = shell.Run([]string{"git", "log", "-1", "--format=%at", tag})
	} else {
		r = me.repo.Run([]string{"git", "log", "-1", "--format=%at", tag})
	}

	out := strings.Join(r.Stdout, "\n")
	out = strings.TrimSpace(out)

	// Convert the string to an integer
	gitTagTimestampInt, err := strconv.ParseInt(out, 10, 64)
	if err != nil {
		fmt.Println("Error converting timestamp:", err)
		return "git tag " + tag + " unknown"
	}

	// Parse the Unix timestamp into a time.Time object
	gitTagDate := time.Unix(gitTagTimestampInt, 0)
	return gitTagDate.UTC().Format("2006-01-02_15:04:05_UTC") // close to RFC3339
}