// Command agentpr manages Gitea pull requests and comments as the unkin-agent
// user. It obtains a scoped Gitea token from Vault (AppRole login, then reads
// gitea/creds/unkin-agent) so actions are attributed to the agent rather than
// to whoever runs the tool.
//
//	agentpr pr create --repo owner/repo --base main --head feature --title T --body B
//	agentpr pr comment --repo owner/repo --pr 12 --body "..."
//	agentpr whoami
package main

import (
	"fmt"
	"os"

	"git.unkin.net/unkin/agent-tools/internal/agent"

	"github.com/spf13/cobra"
)

var version = "dev"

func main() {
	root := &cobra.Command{
		Use:          "agentpr",
		Short:        "Manage Gitea PRs and comments as the unkin-agent user.",
		Long:         "agentpr manages Gitea pull requests and comments as unkin-agent, using a\nGitea token minted from Vault (AppRole login + gitea/creds/unkin-agent).",
		Version:      version,
		SilenceUsage: true,
	}
	root.SetVersionTemplate("{{.Version}}\n")

	root.AddCommand(newPRCmd(), newWhoamiCmd(), newVersionCmd())

	if err := root.Execute(); err != nil {
		os.Exit(1)
	}
}

// client mints a Gitea token via Vault and returns a ready client.
func client() (*agent.GiteaClient, error) {
	token, err := agent.GiteaToken()
	if err != nil {
		return nil, err
	}
	return agent.NewGiteaClient(token), nil
}

func newPRCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "pr",
		Short: "Create PRs and post PR comments",
	}
	cmd.AddCommand(newPRCreateCmd(), newPRCommentCmd())
	return cmd
}

func newPRCreateCmd() *cobra.Command {
	var repo, base, head, title, body string
	cmd := &cobra.Command{
		Use:          "create",
		Short:        "Open a pull request",
		SilenceUsage: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			owner, name, err := agent.ParseRepo(repo)
			if err != nil {
				return err
			}
			if base == "" || head == "" || title == "" {
				return fmt.Errorf("--base, --head and --title are required")
			}
			c, err := client()
			if err != nil {
				return err
			}
			pr, err := c.CreatePR(owner+"/"+name, agent.CreatePROptions{
				Base:  base,
				Head:  head,
				Title: title,
				Body:  body,
			})
			if err != nil {
				return err
			}
			fmt.Printf("#%d %s\n", pr.Number, pr.HTMLURL)
			return nil
		},
	}
	f := cmd.Flags()
	f.StringVar(&repo, "repo", "", "Repository as owner/repo (required)")
	f.StringVar(&base, "base", "", "Base branch (required)")
	f.StringVar(&head, "head", "", "Head branch (required)")
	f.StringVar(&title, "title", "", "PR title (required)")
	f.StringVar(&body, "body", "", "PR body")
	_ = cmd.MarkFlagRequired("repo")
	return cmd
}

func newPRCommentCmd() *cobra.Command {
	var repo, body string
	var pr int
	cmd := &cobra.Command{
		Use:          "comment",
		Short:        "Post a comment on a pull request",
		SilenceUsage: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			owner, name, err := agent.ParseRepo(repo)
			if err != nil {
				return err
			}
			if pr <= 0 {
				return fmt.Errorf("--pr must be a positive PR number")
			}
			if body == "" {
				return fmt.Errorf("--body is required")
			}
			c, err := client()
			if err != nil {
				return err
			}
			cm, err := c.CreateComment(owner+"/"+name, pr, body)
			if err != nil {
				return err
			}
			fmt.Printf("comment %d posted on %s/%s#%d\n", cm.ID, owner, name, pr)
			return nil
		},
	}
	f := cmd.Flags()
	f.StringVar(&repo, "repo", "", "Repository as owner/repo (required)")
	f.IntVar(&pr, "pr", 0, "PR number (required)")
	f.StringVar(&body, "body", "", "Comment body (required)")
	_ = cmd.MarkFlagRequired("repo")
	_ = cmd.MarkFlagRequired("pr")
	_ = cmd.MarkFlagRequired("body")
	return cmd
}

func newWhoamiCmd() *cobra.Command {
	return &cobra.Command{
		Use:          "whoami",
		Short:        "Print the authenticated Gitea login (should be unkin-agent)",
		SilenceUsage: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			c, err := client()
			if err != nil {
				return err
			}
			u, err := c.Whoami()
			if err != nil {
				return err
			}
			fmt.Println(u.Login)
			return nil
		},
	}
}

func newVersionCmd() *cobra.Command {
	return &cobra.Command{
		Use:          "version",
		Short:        "Print the version",
		Run:          func(cmd *cobra.Command, args []string) { fmt.Println(version) },
		SilenceUsage: true,
	}
}