package main

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

	"go.wit.com/dev/alexflint/arg"
	"go.wit.com/lib/gui/shell"
	"go.wit.com/lib/protobuf/forgepb"
	"go.wit.com/lib/protobuf/gitpb"
	"go.wit.com/log"
)

// sent via -ldflags
var VERSION string
var BUILDTIME string

var pp *arg.Parser
var forge *forgepb.Forge
var check *gitpb.Repo

func main() {
	log.Info("go-clean version", VERSION, "built on", BUILDTIME)
	pp = arg.MustParse(&argv)

	// load the ~/.config/forge/ config
	// this lets you configure repos you have read/write access too
	forge = forgepb.Init()
	// rescan just in case (?) todo: decide what forge should default too
	forge.ScanGoSrc()

	// figure out what directory we are running in
	check = findPwdRepo()
	if check == nil {
		log.Info("this directory isn't in a golang project (not in ~/go/src nor a go.work file)")
		os.Exit(-1)
	}
	log.Info("starting go-clean for", check.GoPath)
	log.Info("go src dir is set to", forge.GetGoSrc())

	if argv.Recursive {
		if forge.IsGoWork() {
			var warning []string
			warning = append(warning, "go-clean --recursive may not work unless you are in ~/go/src")
			warning = append(warning, "you can continue anyway, but it hasn't been tested as much.")
			simpleStdin(true, warning)
		}
		var warning []string
		warning = append(warning, "go-clean will recreate go.mod and go.sum")
		warning = append(warning, "because you have selected --recursive")
		warning = append(warning, "this will redo _every_ repo. This is probably fine.")
		warning = append(warning, fmt.Sprintf("You have %d total repositories in %s", forge.Repos.Len(), forge.GetGoSrc()))
		warning = append(warning, "")
		warning = append(warning, "However, this will also do:")
		warning = append(warning, "")
		warning = append(warning, "rm -rf ~/go/pkg/")
		warning = append(warning, "rm -rf ~/.config/go-build/")
		warning = append(warning, "")
		warning = append(warning, "Which is also probably fine, but will clear all your build cache and go mod cache")
		warning = append(warning, "")
		simpleStdin(false, warning)
		purgeGoCaches()
	} else {
		simpleStdin(true, []string{"go-clean will recreate go.mod and go.sum"})
	}

	// re-create go.sum and go.mod
	if _, err := check.RedoGoMod(); err != nil {
		badExit(err)
	}

	/*
		// re-process go deps
		deps := check.GoDeps.SortByGoPath()
		for deps.Scan() {
			depRepo := deps.Next()
			log.Info("check has dep:", depRepo.GoPath)
		}
	*/
	// check go.sum file
	if forge.FinalGoDepsCheckOk(check) {
		log.Info("forge.FinalGoDepsCheck() worked :", check.GoPath)
		okExit(check.GoPath + " go.sum seems clean")
	}
	log.Info("forge.FinalGoDepsCheck() failed. boo. :", check.GoPath)
	badExit(errors.New(check.GoPath + " go.sum is not perfect"))
}

func findPwdRepo() *gitpb.Repo {
	var check *gitpb.Repo
	// attempt to use the working directory
	// this is probably what happens most of the time
	pwd, _ := os.Getwd()
	if strings.HasPrefix(pwd, forge.GetGoSrc()) {
		gopath := strings.TrimPrefix(pwd, forge.GetGoSrc())
		gopath = strings.Trim(gopath, "/")
		log.Info("findRepo() trying gopath", gopath)
		check = forge.Repos.FindByGoPath(gopath)
		if check != nil {
			log.Info("findRepo() worked", check.GoPath)
			return check
		}
	}
	return nil
}

func okExit(thing string) {
	log.Info(thing, "ok")
	log.Info("Finished go-clean on", check.GetGoPath(), "ok")
	os.Exit(0)
}

func badExit(err error) {
	log.Info("Finished go-clean with error", err, forge.GetGoSrc())
	os.Exit(-1)
}

func purgeGoCaches() {
	homedir, err := os.UserHomeDir()
	if err != nil {
		badExit(err)
	}
	pkgdir := filepath.Join(homedir, "go/pkg")
	var cmd []string
	cmd = []string{"chmod", "700", "-R", pkgdir}
	runStrict("", cmd)
	cmd = []string{"rm", "-rf", pkgdir}
	runStrict("", cmd)
	builddir := filepath.Join(homedir, ".cache/go-build")
	cmd = []string{"rm", "-rf", builddir}
	runStrict("", cmd)

	// this can't have really happened
	// echo this still failed in:
	// echo "Linux hpdev2.grid.wit.com 6.9.8-rt-amd64 #1 SMP PREEMPT_RT Debian 6.9.8-1 (2024-07-07) x86_64 GNU/Linux"
	// echo and I had to drop the caches after building go install binaries quickly and running them
	// echo "as an os.Exec() between binaries"
	// echo sysctl -w vm.drop_caches=3
}

func runStrict(wd string, cmd []string) {
	var err error
	if wd != "" {
		if err = os.Chdir(wd); err != nil {
			log.Info("cd", "wd", "failed", err)
			badExit(err)
		}
	}
	log.Info(wd, "running:", wd, cmd)
	// result := shell.Run(cmd)
	result := shell.RunRealtime(cmd)
	if result.Error != nil {
		log.Info("cmd failed", wd, cmd, err)
		for i, line := range result.Stdout {
			log.Info("STDOUT:", i, line)
		}
		for i, line := range result.Stderr {
			log.Info("STDERR:", i, line)
		}
		badExit(err)
	}
	if result.Exit != 0 {
		log.Info("cmd failed", wd, cmd, err)
		for i, line := range result.Stdout {
			log.Info("STDOUT:", i, line)
		}
		for i, line := range result.Stderr {
			log.Info("STDERR:", i, line)
		}
		badExit(errors.New(fmt.Sprintf("cmd failed with %d", result.Exit)))
	}
	for i, line := range result.Stdout {
		log.Info(i, line)
	}
}