package gitpb

// does processing on the go.mod and go.sum files

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

	"go.wit.com/log"
)

// poor name perhaps. It's because in most of these
// repos you can also type "make redomod" to do the same thing
// since it's a Makefile task that is also useful to be able to run
// from the command line
func (repo *Repo) RedoGoMod() (bool, error) {
	// unset the go development ENV var to generate release files
	os.Unsetenv("GO111MODULE")
	if ok, err := repo.strictRun([]string{"rm", "-f", "go.mod", "go.sum"}); !ok {
		log.Warn("rm go.mod go.sum failed", err)
		return ok, err
	}
	if ok, err := repo.strictRun([]string{"go", "mod", "init", repo.GoPath}); !ok {
		log.Warn("go mod init failed", err)
		return ok, err
	}
	if ok, err := repo.strictRun([]string{"go", "mod", "tidy"}); !ok {
		log.Warn("go mod tidy failed", err)
		return ok, err
	}
	// most things should build with golang after 1.20
	if ok, err := repo.strictRun([]string{"go", "mod", "edit", "-go=1.20"}); !ok {
		log.Warn("go mod edit failed", err)
		return ok, err
	}
	// log.Info("MakeRedomod() worked", repo.GoPath)

	if repo.Exists("go.sum") {
		// return the attempt to parse go.mod & go.sum
		return repo.parseGoSum()
	}
	repo.GoDeps = nil
	repo.GoPrimitive = false

	ok, err := repo.isPrimativeGoMod()
	if err != nil {
		// this means this repo does not depend on any other package
		log.Info("PRIMATIVE repo error:", repo.GoPath, "err =", err)
		return false, err
	}
	if ok {
		// this means the repo is primitive so there is no go.sum
		repo.GoPrimitive = true
		return true, nil
	}
	// this should never happen
	return false, errors.New("MakeRedomod() logic failed")
}

// reads and parses the go.sum file
func (repo *Repo) parseGoSum() (bool, error) {
	// empty out what was there before
	repo.GoDeps = nil
	tmp := filepath.Join(repo.FullPath, "go.sum")
	gosum, err := os.Open(tmp)
	if err != nil {
		log.Warn("missing go.sum", repo.FullPath)
		return false, err
	}
	defer gosum.Close()

	scanner := bufio.NewScanner(gosum)
	log.Info("gosum:", tmp)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())

		parts := strings.Split(line, " ")
		if len(parts) == 3 {
			godep := strings.TrimSpace(parts[0])
			version := strings.TrimSpace(parts[1])
			if strings.HasSuffix(version, "/go.mod") {
				version = strings.TrimSuffix(version, "/go.mod")
			}
			new1 := GoDep{
				GoPath:  godep,
				Version: version,
			}
			if repo.GoDeps == nil {
				repo.GoDeps = new(GoDeps)
			}
			repo.GoDeps.AppendUniqueGoPath(&new1)
			/*
				found := repo.FindGoDepByPath(godep)
				if found == nil {
				currentversion, ok := deps[godep]
				if ok {
					// only use the first value found in the file?
					// this shouldn't have been possible. this function should
					// only be called from MakeRedomod()
					// todo: make go things a seperate package so this function
					// isn't exported?
					if version != currentversion {
						log.Warn("\tgo.sum ", godep, "had both", version, currentversion)
					}
				} else {
					deps[godep] = version
					log.Info("\t", godep, "=", version)
				}
			*/
		} else {
			// I've never seen this happen yet
			panic(errors.New("go.sum invalid: " + line))
			// return false, errors.New("go.sum invalid: " + line)
		}
	}

	if err := scanner.Err(); err != nil {
		repo.GoDeps = nil
		return false, err
	}
	return true, nil
}
func (repo *Repo) RepoType() string {
	os.Setenv("GO111MODULE", "off")
	cmd := []string{"go", "list", "-f", "'{{if eq .Name \"main\"}}binary{{else}}library{{end}}'"}
	// cmd := []string{"go", "list", "-f", "'{{.Name}}'"} // probably use this. this just prints out the package name
	// cmd := []string{"go", "list", "-f", "'{{.ImportPath}}'"} // returns go.wit.com/lib/protobuf/gitpb

	result := repo.RunQuiet(cmd)
	if result.Error != nil {
		log.Warn("go list binary detect failed", result.Error)
		return ""
	}
	output := strings.TrimSpace(strings.Join(result.Stdout, "\n"))
	output = strings.Trim(output, "'")
	return output
}