package views

import (
	"strconv"

	"hearthforge/internal/config"
	"hearthforge/internal/db"
	"hearthforge/internal/util"

	g "maragu.dev/gomponents"
	. "maragu.dev/gomponents/html"
)

// ThreadComment is one comment of an issue or patch, with its rendered body.
type ThreadComment struct {
	ID                  int64
	AuthorID            *int64
	AuthorUsername      string
	AuthorAvatarVersion *int64
	Body                string
	BodyHTML            string
	CreatedAt           string
	EditedAt            *string
}

// CommentThread renders the comment list and the new comment form.
// parentStatus is the status of the issue or patch, "open" allows author edits.
func CommentThread(cfg *config.Config, user *db.SessionUser, comments []ThreadComment,
	commentReactions map[int64][]ReactionCount, baseURL, parentStatus string,
) g.Node {
	reactURL := baseURL + "/react"
	canEdit := func(c ThreadComment) bool {
		if user == nil {
			return false
		}
		return user.IsAdmin || (c.AuthorID != nil && user.ID == *c.AuthorID && parentStatus == "open")
	}
	return g.Group{
		g.Map(comments, func(comment ThreadComment) g.Node {
			return Div(Class("timeline-item"),
				Div(Class("timeline-author"),
					Avatar(comment.AuthorID, comment.AuthorAvatarVersion, 24),
					Strong(g.Text(util.DisplayName(comment.AuthorUsername, cfg.OwnerDisplayName))),
					Div(Class("timeline-author-right"),
						g.If(canEdit(comment), Details(Class("inline-edit-details"),
							Summary(Class("btn btn-xs"),
								Span(Class("when-closed"), g.Text("Edit")),
								Span(Class("when-open"), g.Text("Stop editing")),
							),
						)),
						DateWithEdited(comment.CreatedAt, comment.EditedAt),
					),
				),
				g.If(canEdit(comment), Div(Class("inline-edit-form-area"),
					Form(Method("POST"),
						Action(baseURL+"/comments/"+strconv.FormatInt(comment.ID, 10)+"/edit"),
						Class("inline-edit-form"),
						Div(Class("form-group"),
							Textarea(Class("form-input"), Name("edit_body"), Rows("6"),
								MaxLength(strconv.Itoa(cfg.MaxTextBodyBytes)),
								g.Text(comment.Body)),
						),
						Div(Class("form-actions"),
							Button(Type("submit"), Class("btn btn-sm btn-primary"), g.Text("Save")),
						),
					),
				)),
				// The markdown renderer already sanitised this HTML.
				Div(Class("timeline-body markdown-body"), g.Raw(comment.BodyHTML)),
				ReactionBar(commentReactions[comment.ID], reactURL, comment.ID, user),
			)
		}),
		g.If(user != nil, Div(Class("timeline-item timeline-item-new"),
			H3(Class("section-title"), g.Text("Add a comment")),
			Form(Method("POST"), Action(baseURL+"/comments"),
				Div(Class("form-group"),
					Textarea(Name("body"), Rows("6"), MaxLength(strconv.Itoa(cfg.MaxTextBodyBytes)),
						Placeholder("Leave a comment (Markdown supported)"), Required()),
				),
				Div(Class("form-actions"),
					Button(Type("submit"), Class("btn btn-primary"), g.Text("Comment")),
				),
			),
		)),
		g.If(user == nil, P(Class("text-muted"),
			A(Href("/login"), g.Text("Sign in")), g.Text(" to leave a comment."))),
	}
}