package main

import (
	"context"
	"errors"
	"fmt"
	"os"
	"strings"

	"code.gitea.io/sdk/gitea"
	"github.com/cqroot/prompt"
	"github.com/google/go-github/github"
)

// fetchReposForUser fetches a list of all repositories from github for the given user
// or organization. Github by default only returns 30 repositories at a time, so this
// function will make multiple requests to github to fetch all repositories.
// The list of repositories is returned as a list of strings.
func fetchReposForUser(client *github.Client, user string, organization bool) []string {
	var repos []string
	var page int = 1
	var per_page int = 30
	for {
		var repo_list []*github.Repository
		var err error
		if organization {
			repo_list, _, err = client.Repositories.ListByOrg(context.Background(), user, &github.RepositoryListByOrgOptions{
				ListOptions: github.ListOptions{
					Page:    page,
					PerPage: per_page,
				},
			})
		} else {
			repo_list, _, err = client.Repositories.List(context.Background(), user, &github.RepositoryListOptions{
				ListOptions: github.ListOptions{
					Page:    page,
					PerPage: per_page,
				},
			})
		}
		checkErr(err)
		if len(repo_list) == 0 {
			break
		}
		for _, repo := range repo_list {
			repos = append(repos, fmt.Sprintf("%s/%s", user, repo.GetName()))
		}
		page++
	}
	return repos
}

// fetchReposByType fetches a list of repositories from github for the given user based on the
// type of repository (public, private, all, etc.).
// The list of repositories is returned as a list of strings.
func fetchReposByType(client *github.Client, user string, organization bool, types []string) []string {
	var repos []string
	var page int = 1
	var per_page int = 30
	for {
		repo_mega_list := make([]*github.Repository, 0)
		for _, repo_type := range types {
			var repo_list []*github.Repository
			var err error
			if organization {
				repo_list, _, err = client.Repositories.ListByOrg(context.Background(), user, &github.RepositoryListByOrgOptions{
					Type: repo_type,
					ListOptions: github.ListOptions{
						Page:    page,
						PerPage: per_page,
					},
				})
			} else {
				repo_list, _, err = client.Repositories.List(context.Background(), user, &github.RepositoryListOptions{
					Type: repo_type,
					ListOptions: github.ListOptions{
						Page:    page,
						PerPage: per_page,
					},
				})
			}
			checkErr(err)
			repo_mega_list = append(repo_mega_list, repo_list...)
		}
		if len(repo_mega_list) == 0 {
			break
		}
		for _, repo := range repo_mega_list {
			repos = append(repos, fmt.Sprintf("%s/%s", user, repo.GetName()))
		}
		page++
	}
	return repos
}

// buildRepoVisibilityMap builds a map of repository names to their visibility (public or private).
// The list of pairs is returned as a list of strings.
func buildRepoVisibilityMap(client *github.Client, repos []string) map[string]string {
	var repo_visibility_list = make(map[string]string)
	for _, repo_name := range repos {
		parts := strings.Split(repo_name, "/")

		repo, _, err := client.Repositories.Get(context.Background(), parts[0], parts[1])
		checkErr(err)

		visibility := "public"
		if *repo.Private {
			visibility = "private"
		}

		repo_visibility_list[repo_name] = visibility
	}
	return repo_visibility_list
}

func checkErr(err error) {
	if err != nil {
		if errors.Is(err, prompt.ErrUserQuit) {
			fmt.Fprintln(os.Stderr, "Error:", err)
			os.Exit(1)
		} else {
			panic(err)
		}
	}
}

// authenticateGithub authenticates the user with Github using their username
// and password.
// A Github client is returned.
func authenticateGithub(username string, token string) *github.Client {
	ctx := context.Background()
	ts := github.BasicAuthTransport{
		Username: username,
		Password: token,
	}
	client := github.NewClient(ts.Client())
	_, _, err := client.Users.Get(ctx, "")
	if err != nil {
		fmt.Println("Error", err)
	}
	return client
}

func authenticateGitea(host string, user string, token string) *gitea.Client {
	client, err := gitea.NewClient(host, gitea.SetBasicAuth(user, token))
	checkErr(err)
	_, _, err = client.GetMyUserInfo()
	checkErr(err)
	return client
}