package main

import (
	"errors"
	"os"
	"path/filepath"
	"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.SortByFullPath()
		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)")
			badExit(nil, nil)
		}

		if err := doMain(check); err != nil {
			badExit(check, err)
		}
		if argv.Force {
			if err := doForce(check); err != nil {
				badExit(check, err)
			}
		} else {
			if err := doSmart(check); err != nil {
				badExit(check, err)
			}
		}
	}

	if configSave {
		forge.ConfigSave()
	}

	log.Info("forge.FinalGoDepsCheck() worked :", check.GetGoPath())
	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.FindByFullPath(gopath)
		if check != nil {
			log.Info("findRepo() worked", check.GetGoPath())
			return check
		}
	}
	return nil
}

func saveAsMetadata(repo *gitpb.Repo) error {
	cname := repo.GetCurrentBranchName()
	if repo.GoInfo.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 restoreFromGoPkg(repo *gitpb.Repo) error {
	homedir, err := os.UserHomeDir()
	if err != nil {
		badExit(nil, err)
	}
	rver := repo.GetMasterVersion()
	if rver == "" {
		return errors.New("could not get master version")
	}
	modfile := filepath.Join(homedir, "go/pkg/mod", repo.GetGoPath()+"@"+rver, "go.mod")
	log.Info("mod path should be", modfile)
	data, err := os.ReadFile(modfile)
	if err != nil {
		return err
	}
	modf, err := os.OpenFile("go.mod", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		return err
	}
	defer modf.Close()
	modf.Write(data)

	modfile = filepath.Join(homedir, "go/pkg/mod", repo.GetGoPath()+"@"+rver, "go.sum")
	log.Info("mod path should be", modfile)
	data, err = os.ReadFile(modfile)
	if err == nil {
		sumf, _ := os.OpenFile("go.sum", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
		defer sumf.Close()
		sumf.Write(data)
	}

	// try go.sum, but no error checking since it might not be there
	return nil
}

func doMain(repo *gitpb.Repo) error {
	if argv.Strict {
		return doStrict(repo)
	}
	if argv.Force {
		err := doForce(repo)
		return err
	}

	// if --force or --strict is not set, fall back to a "smart" guess
	// at what the user probably would want
	return doSmart(repo)
}