package api

import (
	"code.gitea.io/gitea/modules/structs"
	"fmt"
	"github.com/google/go-github/v59/github"
	"time"
)

func stringPtr(s string) *string {
	return &s
}

func numberPtr(n int) *int {
	return &n
}

func intPtr(n int) *int {
	return &n
}

func int64Ptr(n int64) *int64 {
	return &n
}

func boolPtr(b bool) *bool {
	return &b
}

func timePtr(t time.Time) *github.Timestamp {
	timestamp := github.Timestamp{Time: t}
	return &timestamp
}

func timePtrIfNotNil(t *time.Time) *github.Timestamp {
	if t == nil {
		return nil
	}
	return timePtr(*t)
}

func convertUser(user *structs.User) *github.User {
	if user == nil {
		return &github.User{}
	}
	return &github.User{
		Login: stringPtr(user.UserName),
		ID:    int64Ptr(user.ID),
	}
}

func convertUsers(users []*structs.User) []*github.User {
	var ghUsers []*github.User
	for _, user := range users {
		ghUsers = append(ghUsers, convertUser(user))
	}
	return ghUsers
}

func convertMilestone(milestone *structs.Milestone) *github.Milestone {
	if milestone == nil {
		return &github.Milestone{}
	}
	return &github.Milestone{
		Title: stringPtr(milestone.Title),
	}
}

func convertLabels(labels []*structs.Label) []*github.Label {
	if labels == nil {
		return make([]*github.Label, 0)
	}
	var ghLabels []*github.Label
	for _, label := range labels {
		if label == nil {
			continue
		}
		ghLabels = append(ghLabels, &github.Label{
			Name: stringPtr(label.Name),
		})
	}
	return ghLabels
}

func convertPRBranch(branch *structs.PRBranchInfo) *github.PullRequestBranch {
	if branch == nil {
		return &github.PullRequestBranch{}
	}
	return &github.PullRequestBranch{
		Label: stringPtr(branch.Name),
		Ref:   stringPtr(branch.Ref),
		SHA:   stringPtr(branch.Sha),
		Repo:  convertRepo(branch.Repository),
	}
}

func convertRepo(repo *structs.Repository) *github.Repository {
	if repo == nil {
		return &github.Repository{}
	}
	return &github.Repository{
		ID:               int64Ptr(repo.ID),
		Name:             stringPtr(repo.Name),
		Owner:            convertUser(repo.Owner),
		FullName:         stringPtr(repo.FullName),
		Description:      stringPtr(repo.Description),
		Homepage:         stringPtr(repo.Website),
		HTMLURL:          stringPtr(repo.HTMLURL),
		CloneURL:         stringPtr(repo.CloneURL),
		GitURL:           stringPtr(repo.CloneURL),
		SSHURL:           stringPtr(repo.SSHURL),
		DefaultBranch:    stringPtr(repo.DefaultBranch),
		CreatedAt:        timePtr(repo.Created),
		UpdatedAt:        timePtr(repo.Updated),
		Private:          boolPtr(repo.Private),
		Fork:             boolPtr(repo.Fork),
		Size:             intPtr(repo.Size),
		StargazersCount:  intPtr(repo.Stars),
		SubscribersCount: intPtr(repo.Watchers),
		ForksCount:       intPtr(repo.Forks),
		Watchers:         intPtr(repo.Watchers),
		WatchersCount:    intPtr(repo.Stars),
		OpenIssuesCount:  intPtr(repo.OpenIssues),
		Archived:         boolPtr(repo.Archived),
	}
}

func convertPullRequest(request *structs.PullRequest) *github.PullRequest {
	if request == nil {
		return &github.PullRequest{}
	}
	pr := &github.PullRequest{
		ID:             int64Ptr(request.ID),
		Number:         intPtr(int(request.Index)),
		State:          stringPtr(string(request.State)),
		Title:          stringPtr(request.Title),
		Body:           stringPtr(request.Body),
		CreatedAt:      timePtr(*request.Created),
		UpdatedAt:      timePtr(*request.Updated),
		ClosedAt:       timePtrIfNotNil(request.Closed),
		MergedAt:       timePtrIfNotNil(request.Merged),
		Merged:         boolPtr(request.HasMerged),
		Mergeable:      boolPtr(request.Mergeable),
		MergeCommitSHA: request.MergedCommitID,
		URL:            stringPtr(request.URL),
		HTMLURL:        stringPtr(request.HTMLURL),
		DiffURL:        stringPtr(request.DiffURL),
		PatchURL:       stringPtr(request.PatchURL),
		Comments:       intPtr(request.Comments),
		Assignee:       convertUser(request.Assignee),
		Assignees:      convertUsers(request.Assignees),
		Milestone:      convertMilestone(request.Milestone),
		Labels:         convertLabels(request.Labels),
	}

	// Convert PR branch info
	if request.Head != nil {
		pr.Head = convertPRBranch(request.Head)
	}
	if request.Base != nil {
		pr.Base = convertPRBranch(request.Base)
	}

	return pr
}

func convertChanges(changes *structs.ChangesPayload) *github.EditChange {
	if changes == nil {
		return &github.EditChange{}
	}
	return &github.EditChange{
		Title: &github.EditTitle{
			From: stringPtr(changes.Title.From),
		},
		Body: &github.EditBody{
			From: stringPtr(changes.Body.From),
		},
		Base: &github.EditBase{
			Ref: &github.EditRef{
				From: stringPtr(changes.Ref.From),
			},
		},
	}
}

func convertLabel(label *structs.Label) *github.Label {
	if label == nil {
		return &github.Label{}
	}
	return &github.Label{
		ID:          int64Ptr(label.ID),
		Name:        stringPtr(label.Name),
		Color:       stringPtr(label.Color),
		Description: stringPtr(label.Description),
		URL:         stringPtr(label.URL),
	}
}

func convertCommitFile(file *structs.ChangedFile) *github.CommitFile {
	if file == nil {
		return &github.CommitFile{}
	}

	return &github.CommitFile{
		Filename:         stringPtr(file.Filename),
		PreviousFilename: stringPtr(file.PreviousFilename),
		Additions:        intPtr(file.Additions),
		Deletions:        intPtr(file.Deletions),
		Changes:          intPtr(file.Changes),
		Status:           stringPtr(file.Status),
		BlobURL:          stringPtr(file.ContentsURL),
		RawURL:           stringPtr(file.RawURL),
	}
}

func translatePrAction(action structs.HookIssueAction) string {
	translatedAction := ""

	switch action {
	case structs.HookIssueOpened:
		translatedAction = "opened"
	case structs.HookIssueClosed:
		translatedAction = "closed"
	case structs.HookIssueReOpened:
		translatedAction = "reopened"
	case structs.HookIssueEdited:
		translatedAction = "edited"
	case structs.HookIssueAssigned:
		translatedAction = "assigned"
	case structs.HookIssueUnassigned:
		translatedAction = "unassigned"
	case structs.HookIssueLabelUpdated:
		// GitHub does not have a direct "label_updated" event; use "labeled" as the closest action
		translatedAction = "labeled" // Assuming you handle the update as adding a label
	case structs.HookIssueLabelCleared:
		// GitHub does not have a direct "label_cleared" event; use "unlabeled" as the closest action
		translatedAction = "unlabeled" // Assuming you handle the clearing as removing a label
	case structs.HookIssueSynchronized:
		translatedAction = "synchronize"
	case structs.HookIssueMilestoned:
		translatedAction = "milestoned"
	case structs.HookIssueDemilestoned:
		translatedAction = "demilestoned"
	case structs.HookIssueReviewed:
		// GitHub does not have a direct "reviewed" event for PRs; this might be closest to a review submitted
		translatedAction = "review_submitted" // This is not a direct GitHub event, consider how best to map this action
	case structs.HookIssueReviewRequested:
		translatedAction = "review_requested"
	case structs.HookIssueReviewRequestRemoved:
		translatedAction = "review_request_removed"
	default:
		// Fallback for any unhandled actions
		translatedAction = "unknown_action"
	}

	translatedAction = fmt.Sprintf("pull_request.%s", translatedAction)

	return translatedAction
}