//go:build !fasthttp

package gitea

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"
	"time"

	"code.gitea.io/sdk/gitea"

	"codeberg.org/codeberg/pages/server/cache"
)

type Client struct {
	sdkClient     *gitea.Client
	responseCache cache.SetGetKey

	followSymlinks bool
	supportLFS     bool
}

func NewClient(giteaRoot, giteaAPIToken string, respCache cache.SetGetKey, followSymlinks, supportLFS bool) (*Client, error) {
	rootURL, err := url.Parse(giteaRoot)
	giteaRoot = strings.Trim(rootURL.String(), "/")

	stdClient := http.Client{Timeout: 10 * time.Second}

	sdk, err := gitea.NewClient(giteaRoot, gitea.SetHTTPClient(&stdClient), gitea.SetToken(giteaAPIToken))
	return &Client{
		sdkClient:     sdk,
		responseCache: respCache,
	}, err
}

func (client *Client) GiteaRawContent(targetOwner, targetRepo, ref, resource string) ([]byte, error) {
	rawBytes, resp, err := client.sdkClient.GetFile(targetOwner, targetRepo, ref, resource, client.supportLFS)
	if err != nil {
		return nil, err
	}

	switch resp.StatusCode {
	case http.StatusOK:
		return rawBytes, nil
	case http.StatusNotFound:
		return nil, ErrorNotFound
	default:
		return nil, fmt.Errorf("unexpected status code '%d'", resp.StatusCode)
	}
}

func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource string) (io.ReadCloser, error) {
	reader, resp, err := client.sdkClient.GetFileReader(targetOwner, targetRepo, ref, resource, client.supportLFS)
	if err != nil {
		return nil, err
	}

	switch resp.StatusCode {
	case http.StatusOK:
		return reader, nil
	case http.StatusNotFound:
		return nil, ErrorNotFound
	default:
		return nil, fmt.Errorf("unexpected status code '%d'", resp.StatusCode)
	}
}

func (client *Client) GiteaGetRepoBranchTimestamp(repoOwner, repoName, branchName string) (*BranchTimestamp, error) {
	cacheKey := fmt.Sprintf("%s/%s/%s/%s", branchTimestampCacheKeyPrefix, repoOwner, repoName, branchName)

	if stamp, ok := client.responseCache.Get(cacheKey); ok && stamp != nil {
		return stamp.(*BranchTimestamp), nil
	}

	branch, resp, err := client.sdkClient.GetRepoBranch(repoOwner, repoName, branchName)
	if err != nil {
		if resp != nil && resp.StatusCode == http.StatusNotFound {
			return &BranchTimestamp{}, ErrorNotFound
		}
		return &BranchTimestamp{}, err
	}
	if resp.StatusCode != http.StatusOK {
		return &BranchTimestamp{}, fmt.Errorf("unexpected status code '%d'", resp.StatusCode)
	}

	stamp := &BranchTimestamp{
		Branch:    branch.Name,
		Timestamp: branch.Commit.Timestamp,
	}

	client.responseCache.Set(cacheKey, stamp, branchExistenceCacheTimeout)
	return stamp, nil
}

func (client *Client) GiteaGetRepoDefaultBranch(repoOwner, repoName string) (string, error) {
	cacheKey := fmt.Sprintf("%s/%s/%s", defaultBranchCacheKeyPrefix, repoOwner, repoName)

	if branch, ok := client.responseCache.Get(cacheKey); ok && branch != nil {
		return branch.(string), nil
	}

	repo, resp, err := client.sdkClient.GetRepo(repoOwner, repoName)
	if err != nil {
		return "", err
	}
	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("unexpected status code '%d'", resp.StatusCode)
	}

	branch := repo.DefaultBranch
	client.responseCache.Set(cacheKey, branch, defaultBranchCacheTimeout)
	return branch, nil
}