package service

import (
	"context"
	"fmt"

	"go.jolheiser.com/vanity/api"
	"go.jolheiser.com/vanity/flags"

	"github.com/google/go-github/v32/github"
	"golang.org/x/oauth2"
)

var _ Service = &GitHub{}

func NewGitHub() *GitHub {
	ts := oauth2.StaticTokenSource(
		&oauth2.Token{AccessToken: flags.Token},
	)
	client := oauth2.NewClient(context.Background(), ts)
	ghClient := github.NewClient(client)
	ghClient.BaseURL = flags.BaseURL
	return &GitHub{
		client: ghClient,
	}
}

type GitHub struct {
	client *github.Client
}

func (g GitHub) Packages() (map[string]*api.Package, error) {
	packages := make(map[string]*api.Package)
	page := 0
	for {
		opts := github.RepositoryListOptions{
			ListOptions: github.ListOptions{
				Page:    page,
				PerPage: 50,
			},
		}

		repos, _, err := g.client.Repositories.List(context.Background(), flags.Namespace, &opts)
		if err != nil {
			return nil, err
		}

		for _, repo := range repos {
			packages[repo.GetName()] = &api.Package{
				Name:        repo.GetName(),
				Description: repo.GetDescription(),
				Branch:      repo.GetDefaultBranch(),
				WebURL:      repo.GetHTMLURL(),
				CloneHTTP:   repo.GetCloneURL(),
				CloneSSH:    repo.GetSSHURL(),
				Private:     repo.GetPrivate(),
				Fork:        repo.GetFork(),
				Mirror:      false,
				Archive:     repo.GetArchived(),
				Topics:      repo.Topics,
			}
		}

		page++
		if len(repos) == 0 {
			break
		}
	}

	return packages, nil
}

func (g GitHub) GoDir(pkg *api.Package) string {
	return fmt.Sprintf("%s/tree/%s{/dir}", pkg.WebURL, pkg.Branch)
}

func (g GitHub) GoFile(pkg *api.Package) string {
	return fmt.Sprintf("%s/blob/%s{/dir}/{file}#L{line}", pkg.WebURL, pkg.Branch)
}

func (g GitHub) GoMod(pkg *api.Package) (string, error) {
	content, _, _, err := g.client.Repositories.GetContents(context.Background(), flags.Namespace, pkg.Name, "go.mod",
		&github.RepositoryContentGetOptions{
			Ref: pkg.Branch,
		})
	if err != nil {
		return "", err
	}
	return content.GetContent()
}