package gitea

import (
	"context"
	"log/slog"
	"net/http"
	"slices"
	"strconv"
	"strings"

	"code.gitea.io/sdk/gitea"
	"forge.cadoles.com/wpetit/clearcase/internal/core/model"
	"forge.cadoles.com/wpetit/clearcase/internal/core/port"
	"github.com/pkg/errors"
)

type Forge struct {
	client *gitea.Client
}

// GetProject implements port.Forge.
func (f *Forge) GetProject(ctx context.Context, rawProjectID string) (*model.Project, error) {
	projectID, err := strconv.ParseInt(rawProjectID, 10, 64)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	project, _, err := f.client.GetRepoByID(projectID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	return &model.Project{
		ID:          rawProjectID,
		Name:        project.FullName,
		Description: project.Description,
	}, nil
}

// GetProjectLanguages implements port.Forge.
func (f *Forge) GetProjectLanguages(ctx context.Context, rawProjectID string) ([]string, error) {
	projectID, err := strconv.ParseInt(rawProjectID, 10, 64)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	project, _, err := f.client.GetRepoByID(projectID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	mappedLanguages, _, err := f.client.GetRepoLanguages(project.Owner.UserName, project.Name)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	languages := make([]string, 0, len(mappedLanguages))

	for l := range mappedLanguages {
		languages = append(languages, l)
	}

	return languages, nil
}

// CreateIssue implements port.Forge.
func (f *Forge) CreateIssue(ctx context.Context, rawProjectID string, title string, body string) (string, error) {
	projectID, err := strconv.ParseInt(rawProjectID, 10, 64)
	if err != nil {
		return "", errors.WithStack(err)
	}

	project, _, err := f.client.GetRepoByID(projectID)
	if err != nil {
		return "", errors.WithStack(err)
	}

	issue, _, err := f.client.CreateIssue(project.Owner.UserName, project.Name, gitea.CreateIssueOption{
		Title: title,
		Body:  body,
	})
	if err != nil {
		return "", errors.WithStack(err)
	}

	return issue.HTMLURL, nil
}

// GetIssueTemplate implements port.Forge.
func (f *Forge) GetIssueTemplate(ctx context.Context, rawProjectID string) (string, error) {
	projectID, err := strconv.ParseInt(rawProjectID, 10, 64)
	if err != nil {
		return "", errors.WithStack(err)
	}

	project, _, err := f.client.GetRepoByID(projectID)
	if err != nil {
		return "", errors.WithStack(err)
	}

	data, res, err := f.client.GetFile(project.Owner.UserName, project.Name, project.DefaultBranch, ".gitea/issue_template.md")
	if err != nil {
		if res.StatusCode == http.StatusNotFound {
			return "", errors.WithStack(port.ErrFileNotFound)
		}

		return "", errors.WithStack(err)
	}

	return string(data), nil
}

// GetIssues implements port.Forge.
func (f *Forge) GetIssues(ctx context.Context, rawProjectID string, issueIDs ...string) ([]*model.Issue, error) {
	projectID, err := strconv.ParseInt(rawProjectID, 10, 64)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	project, _, err := f.client.GetRepoByID(projectID)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	issues := make([]*model.Issue, 0)

	for _, rawIssueID := range issueIDs {
		issueID, err := strconv.ParseInt(rawIssueID, 10, 64)
		if err != nil {
			slog.ErrorContext(ctx, "could not parse issue id", slog.Any("error", errors.WithStack(err)))
			issues = append(issues, nil)
			continue
		}

		issue, _, err := f.client.GetIssue(project.Owner.UserName, project.Name, issueID)
		if err != nil {
			slog.ErrorContext(ctx, "could not get issue", slog.String("project", project.FullName), slog.Int64("issueID", issueID), slog.Any("error", errors.WithStack(err)))
			issues = append(issues, nil)
			continue
		}

		issues = append(issues, &model.Issue{
			ID:    rawIssueID,
			Title: issue.Title,
			Body:  issue.Body,
		})
	}

	return issues, nil
}

// GetAllProjects implements port.Forge.
func (f *Forge) GetAllProjects(ctx context.Context) ([]*model.Project, error) {
	projects := make([]*model.Project, 0)

	page := 1
	for {
		repositories, res, err := f.client.ListMyRepos(gitea.ListReposOptions{
			ListOptions: gitea.ListOptions{
				Page:     page,
				PageSize: 100,
			},
		})
		if err != nil {
			return nil, errors.WithStack(err)
		}

		page = res.NextPage

		if res.NextPage == 0 {
			break
		}

		for _, r := range repositories {
			projects = append(projects, &model.Project{
				ID:   strconv.FormatInt(r.ID, 10),
				Name: r.FullName,
			})
		}
	}

	slices.SortFunc(projects, func(p1 *model.Project, p2 *model.Project) int {
		return strings.Compare(p1.Name, p2.Name)
	})

	return projects, nil
}

func NewForge(client *gitea.Client) *Forge {
	return &Forge{client: client}
}

var _ port.Forge = &Forge{}