package main

import (
	"errors"
	"os"
	"strings"

	"go.wit.com/dev/alexflint/arg"
	"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
var configSave bool

func main() {
	var check *gitpb.Repo
	log.Info("go-mod-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()

	if argv.All {
		// run this on every single repo
		// do this before publishing new golang versions
		all := forge.Repos.SortByGoPath()
		for all.Scan() {
			check = all.Next()
			if err := doMain(check); err != nil {
				badExit(check, err)
			}
		}
	} else {
		// 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)
		}

		if err := doMain(check); err != nil {
			badExit(check, err)
		}
	}

	if configSave {
		forge.ConfigSave()
	}

	log.Info("forge.FinalGoDepsCheck() worked :", check.GoPath)
	okExit(check, "go.sum seems clean")
}

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 saveAsMetadata(repo *gitpb.Repo) error {
	cname := repo.GetCurrentBranchName()
	if repo.GoPrimitive {
		if err := repo.AutogenSave([]string{"go.mod"}, cname, true); err != nil {
			return err
		}
	} else {
		if err := repo.AutogenSave([]string{"go.mod", "go.sum"}, cname, true); err != nil {
			return err
		}
	}
	return nil
}

func doMain(repo *gitpb.Repo) error {
	if !repo.IsValid() {
		log.Info(repo.GoPath, "is invalid. fix your repos.pb file with 'forge' first")
		log.Info("")
		log.Info("go install go.wit.com/apps/forge@latest")
		log.Info("")
		return errors.New(repo.GoPath + " is invalid. fix your repository list with 'forge' first")
	} else {
		log.Info(repo.GoPath, "is valid according to forge")
	}

	// skip restore if --force
	if !argv.Force {
		// erase the go.mod and go.sum files
		eraseGoMod(repo)
		cname := repo.GetCurrentBranchName()
		// try to restore from the git metadata
		if err := repo.AutogenRestore(cname); err != nil {
			// ignore errors here
		}
		if err := repo.ValidGoSum(); err == nil {
			log.Info(repo.GoPath, "go.mod and go.sum were restored ok")
			configSave = true
			return nil
		}
	}

	// double check here. use --force to remake them
	if err := repo.ValidGoSum(); err == nil {
		log.Info(repo.GoPath, "go.mod and go.sum are already valid")
		return nil
	}

	if repo.GetMasterBranchName() != repo.GetCurrentBranchName() {
		log.Info("")
		log.Info("You can only run go-mod-clean on a git master branch.")
		log.Info("Publishing go.mod & go.sum files must come from from git version tag")
		log.Info("Anything else doesn't make sense.")
		log.Info("")
		return errors.New(repo.GoPath + " not in the git master branch")
	}

	ok, err := repoIgnoresGoMod(repo)
	if err != nil {
		log.Info(repo.GoPath, "some wierd git error happened. investigate.", err)
		return err
	}
	// if ok, then git owns 'go.mod' and we can't really do anything
	// todo: ignore this with --force
	if ok {
		log.Info(repo.GoPath, "git says it does not own go.mod")
		// continue and attempt to create go.mod and go.sum
	} else {
		if forge.Config.IsReadOnly(repo.GoPath) {
			log.Info("skipping read only", repo.GoPath)
			return nil
		}
		// continue and attempt to create go.mod and go.sum
	}

	if repo.CheckDirty() {
		log.Info("")
		log.Info("You can not run this on dirty branches.")
		log.Info("")
		return errors.New(repo.GoPath + " git repo is dirty")
	}

	log.Info(repo.GoPath, "GOING TO MAKE NEW go.* FILES")

	// actually will re-create go.sum and go.mod now
	if err := redoGoMod(repo); err != nil {
		return err
	}

	if argv.Trim {
		// the first time, it'll attempt to fix some stuff
		cleanGoDepsCheckOk(repo)
		// try to trim junk
		if err := trimGoSum(repo); err != nil {
			return err
		}
		repo.ParseGoSum()
	}

	/*
		data, _ := repo.ReadFile("go.mod")
		log.Info(string(data))
		data, _ = repo.ReadFile("go.sum")
		log.Info(string(data))
	*/

	// check go.sum file
	if err := cleanGoDepsCheckOk(repo); err != nil {
		log.Info("forge.FinalGoDepsCheck() failed. boo. :", repo.GoPath)
		return err
	}

	// put the files in the notes section in git
	// this way, git commits are not messed up
	// with this autogenerated code
	if err := saveAsMetadata(repo); err != nil {
		log.Info("save go.mod as git metadata failed", repo.GoPath, err)
		return err
	}

	// everything worked!
	configSave = true
	return nil
}