package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"sync"

	"git.geekeey.de/actions/sdk"
)

func main() {
	action := &ReleaseAction{Action: sdk.New()}
	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
	defer cancel()
	if err := action.run(ctx); err != nil {
		action.Errorf("%s", err)
		os.Exit(1)
	}
}

type ReleaseAction struct {
	*sdk.Action
	repository Repository
	version    string

	draft      bool
	prerelease bool

	label string
	notes string

	artifacts []string
}

type Repository []string

func NewRepository(r string) (Repository, error) {
	split := strings.Split(string(r), "/")
	if len(split) != 2 {
		return nil, fmt.Errorf("repository must be in the format '<owner>/<repo>'")
	}
	return split, nil
}
func (r Repository) Owner() string { return r[0] }
func (r Repository) Repo() string  { return r[1] }

func (action *ReleaseAction) setup() error {
	var err error

	r, err := NewRepository(action.GetInput("repository"))
	if err != nil {
		return fmt.Errorf("input 'repository': %s", err)
	}
	action.repository = r

	action.version = action.GetInput("version")
	if len(action.version) == 0 {
		return fmt.Errorf("input 'version': is empty")
	}

	pattern := func(name string) (bool, error) {
		input := action.GetInput(name)
		if len(input) == 0 {
			return false, fmt.Errorf("input %q: is empty", name)
		}
		value, err := strconv.ParseBool(input)
		if err != nil {
			expr, err := regexp.Compile(input)
			if err != nil {
				return false, fmt.Errorf("input %q: is not a bool or a valid regex", name)
			}
			value = expr.MatchString(action.version)
		}
		return value, nil
	}

	// draft might be a bool constant or a regex which determins if it is
	// a draft by matching against the input version
	action.draft, err = pattern("draft")
	if err != nil {
		return fmt.Errorf("input 'draft': is not a bool or a valid regex")
	}

	// prerelease might be a bool constant or a regex which determins if it is
	// a prelease by matching against the input version
	action.prerelease, err = pattern("prerelease")
	if err != nil {
		return fmt.Errorf("input 'prerelease': is not a bool or a valid regex")
	}

	action.label = action.GetInput("label")
	action.notes = action.GetInput("notes")

	// attachements can be a multline string, treat each line as a pattern
	patterns := strings.Split(strings.TrimSuffix(action.GetInput("attachments"), "\n"), "\n")
	action.artifacts = []string{}
	for _, pattern := range patterns {
		if len(pattern) == 0 {
			continue
		}
		matches, err := filepath.Glob(pattern)
		if err != nil {
			return fmt.Errorf("input 'attachments': pattern '%s' was malformatted: %s", pattern, err)
		}
		action.artifacts = append(action.artifacts, matches...)
	}
	return nil
}

func (action *ReleaseAction) run(ctx context.Context) error {
	if err := action.setup(); err != nil {
		return err
	}
	github := NewGitHub(action.Client())

	// only get the commit info when we are missing a name or a text
	if len(action.label) == 0 || len(action.notes) == 0 {
		action.Debugf("Getting git tag information from repository")
		tag, err := github.GetGitTagInfo(action.repository.Owner(), action.repository.Repo(), action.version, ctx)
		if err != nil {
			return err
		}
		if len(action.label) == 0 {
			action.label = tag.Name
		}
		if len(action.notes) == 0 {
			action.notes = tag.Message
		}
	}

	action.Debugf("Creating release %s", action.version)
	release, err := github.CreateRelease(&CreateReleaseRequest{
		Owner:      action.repository.Owner(),
		Repo:       action.repository.Repo(),
		Name:       action.label,
		Body:       action.notes,
		Draft:      action.draft,
		PreRelease: action.prerelease,
		TagName:    action.version,
	}, ctx)
	if err != nil {
		return fmt.Errorf("cannot create release for %s: %s", action.version, err)
	}
	action.Noticef("Created release %s: %s", release.Name, release.HtmlURL)

	wg := sync.WaitGroup{}
	for _, artifact := range action.artifacts {
		wg.Add(1)
		go func() {
			defer wg.Done()
			f, err := os.Open(artifact)
			if err != nil {
				action.Warningf("Unable to open file %s", artifact)
				return
			}
			a, err := github.CreateReleaseArtifact(&CreateReleaseArtifactRequest{
				Id:         release.Id,
				Owner:      action.repository.Owner(),
				Repo:       action.repository.Repo(),
				Name:       f.Name(), // unused?
				Attachment: f,
			}, ctx)
			if err != nil {
				action.Warningf("Unable to create artifact for %s", artifact)
				return
			}
			action.Debugf("Uploaded artifact %s (%d)", a.Name, a.Size)
		}()
	}
	wg.Wait()

	return nil
}