package api

import (
	"code.gitea.io/gitea/modules/structs"
	gitea "code.gitea.io/sdk/gitea"
	"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 *gitea.User) *github.User {
	if user == nil {
		return &github.User{}
	}
	return &github.User{
		Login: stringPtr(user.UserName),
		ID:    int64Ptr(user.ID),
	}
}

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

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

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

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

func convertLabels(labels []*gitea.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 convertCoreLabels(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 *gitea.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 convertCorePRBranch(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:  convertCoreRepo(branch.Repository),
	}
}

func convertRepo(repo *gitea.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 convertCoreRepo(repo *structs.Repository) *github.Repository {
	if repo == nil {
		return &github.Repository{}
	}
	return &github.Repository{
		ID:               int64Ptr(repo.ID),
		Name:             stringPtr(repo.Name),
		Owner:            convertCoreUser(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:       convertCoreUser(request.Assignee),
		Assignees:      convertCoreUsers(request.Assignees),
		Milestone:      convertCoreMilestone(request.Milestone),
		Labels:         convertCoreLabels(request.Labels),
	}

	// Convert PR branch info
	if request.Head != nil {
		pr.Head = convertCorePRBranch(request.Head)
	}
	if request.Base != nil {
		pr.Base = convertCorePRBranch(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 *gitea.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 convertCoreLabel(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 *gitea.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 convertGitTree(tree *gitea.GitTreeResponse) *github.Tree {
	if tree == nil {
		return &github.Tree{}
	}
	return &github.Tree{
		SHA:       stringPtr(tree.SHA),
		Truncated: boolPtr(tree.Truncated),
		Entries:   convertGitEntries(tree.Entries),
	}
}

func convertGitEntries(entries []gitea.GitEntry) []*github.TreeEntry {
	if entries == nil {
		return make([]*github.TreeEntry, 0)
	}
	var ghEntries []*github.TreeEntry
	for _, entry := range entries {
		ghEntries = append(ghEntries, convertGitEntry(&entry))
	}
	return ghEntries
}

func convertGitEntry(s *gitea.GitEntry) *github.TreeEntry {
	if s == nil {
		return &github.TreeEntry{}
	}
	return &github.TreeEntry{
		Path: stringPtr(s.Path),
		Mode: stringPtr(s.Mode),
		Type: stringPtr(s.Type),
		Size: intPtr(int(s.Size)),
		SHA:  stringPtr(s.SHA),
		URL:  stringPtr(s.URL),
	}
}

func convertIssueComment(comment *gitea.Comment, reactions []*gitea.Reaction) *github.IssueComment {
	if comment == nil {
		return &github.IssueComment{}
	}
	return &github.IssueComment{
		ID:        int64Ptr(comment.ID),
		Body:      stringPtr(comment.Body),
		CreatedAt: timePtr(comment.Created),
		UpdatedAt: timePtr(comment.Updated),
		User:      convertUser(comment.Poster),
		Reactions: convertReactions(reactions),
	}
}

func convertReactions(reactions []*gitea.Reaction) *github.Reactions {
	if reactions == nil {
		return &github.Reactions{}
	}
	return &github.Reactions{
		TotalCount: intPtr(len(reactions)),
		PlusOne:    intPtr(countReaction(reactions, "+1")),
		MinusOne:   intPtr(countReaction(reactions, "-1")),
		Laugh:      intPtr(countReaction(reactions, "laugh")),
		Confused:   intPtr(countReaction(reactions, "confused")),
		Heart:      intPtr(countReaction(reactions, "heart")),
		Rocket:     intPtr(countReaction(reactions, "rocket")),
		Eyes:       intPtr(countReaction(reactions, "eyes")),
	}
}

func countReaction(reactions []*gitea.Reaction, reactionType string) int {
	count := 0
	for _, reaction := range reactions {
		if reaction.Reaction == reactionType {
			count++
		}
	}
	return count
}

func translatePrAction(action structs.HookIssueAction, prefix bool) 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"
	}

	if prefix {
		translatedAction = fmt.Sprintf("pull_request.%s", translatedAction)
	}

	return translatedAction
}