// Package forge provides a thin wrapper around the Forgejo Go SDK
// for managing repositories, issues, and pull requests on a Forgejo instance.
//
// Authentication is resolved from config file, environment variables, or flag overrides:
//
//  1. ~/.core/config.yaml keys: forge.token, forge.url
//  2. FORGE_TOKEN + FORGE_URL environment variables (override config file)
//  3. Flag overrides via core forge config --url/--token (highest priority)
package forge

import (
	forgejo "codeberg.org/mvdkleijn/forgejo-sdk/forgejo/v2"

	"github.com/host-uk/core/pkg/log"
)

// Client wraps the Forgejo SDK client with config-based auth.
type Client struct {
	api   *forgejo.Client
	url   string
	token string
}

// New creates a new Forgejo API client for the given URL and token.
func New(url, token string) (*Client, error) {
	api, err := forgejo.NewClient(url, forgejo.SetToken(token))
	if err != nil {
		return nil, log.E("forge.New", "failed to create client", err)
	}

	return &Client{api: api, url: url, token: token}, nil
}

// API exposes the underlying SDK client for direct access.
func (c *Client) API() *forgejo.Client { return c.api }

// URL returns the Forgejo instance URL.
func (c *Client) URL() string { return c.url }

// Token returns the Forgejo API token.
func (c *Client) Token() string { return c.token }

// GetCurrentUser returns the authenticated user's information.
func (c *Client) GetCurrentUser() (*forgejo.User, error) {
	user, _, err := c.api.GetMyUserInfo()
	if err != nil {
		return nil, log.E("forge.GetCurrentUser", "failed to get current user", err)
	}
	return user, nil
}

// ForkRepo forks a repository. If org is non-empty, forks into that organisation.
func (c *Client) ForkRepo(owner, repo string, org string) (*forgejo.Repository, error) {
	opts := forgejo.CreateForkOption{}
	if org != "" {
		opts.Organization = &org
	}

	fork, _, err := c.api.CreateFork(owner, repo, opts)
	if err != nil {
		return nil, log.E("forge.ForkRepo", "failed to fork repository", err)
	}
	return fork, nil
}

// CreatePullRequest creates a pull request on the given repository.
func (c *Client) CreatePullRequest(owner, repo string, opts forgejo.CreatePullRequestOption) (*forgejo.PullRequest, error) {
	pr, _, err := c.api.CreatePullRequest(owner, repo, opts)
	if err != nil {
		return nil, log.E("forge.CreatePullRequest", "failed to create pull request", err)
	}
	return pr, nil
}