package component

import (
	"bytes"
	"context"
	"forge.cadoles.com/wpetit/clearcase/internal/core/model"
	"forge.cadoles.com/wpetit/clearcase/internal/http/form"
	common "forge.cadoles.com/wpetit/clearcase/internal/http/handler/webui/common/component"
	"github.com/pkg/errors"
	"github.com/yuin/goldmark"
	"log/slog"
)

type IssuePageVModel struct {
	IssueURL          string
	SummaryForm       *form.Form
	IssueForm         *form.Form
	IssueTips         string
	Projects          []*model.Project
	SelectedProjectID string
}

func NewIssueSummaryForm() *form.Form {
	return form.New(
		form.NewField(
			"project",
			form.Attrs{},
			form.NonEmpty("Ce champs ne doit pas être vide."),
		),
		form.NewField(
			"summary",
			form.Attrs{
				"type":        "textarea",
				"rows":        "20",
				"placeholder": "Décrivez rapidement le sujet du problème rencontré ou de l'évolution souhaitée...",
			},
			form.NonEmpty("Ce champs ne doit pas être vide."),
		),
	)
}

func NewIssueForm() *form.Form {
	return form.New(
		form.NewField(
			"title",
			form.Attrs{
				"type": "text",
			},
			form.NonEmpty("Ce champs ne doit pas être vide."),
		),
		form.NewField(
			"body",
			form.Attrs{
				"type": "textarea",
				"rows": "20",
			},
			form.NonEmpty("Ce champs ne doit pas être vide."),
		),
	)
}

templ IssuePage(vmodel IssuePageVModel) {
	@common.Page(common.WithTitle("Nouvelle demande")) {
		<div class="container is-fluid">
			<section class="section">
				<div class="buttons is-right">
					<a class="button is-medium" href={ common.BaseURL(ctx, common.WithPath("/auth/logout")) }>Se déconnecter</a>
				</div>
				if vmodel.IssueURL != "" {
					<article class="message is-primary">
						<div class="message-header">
							<p>Demande créée !</p>
							<button class="delete" aria-label="delete" hx-on:click="onCloseMessage(this)"></button>
						</div>
						<div class="message-body">
							Votre demande a été créée et est disponible à l'adresse suivante:
							<a href={ templ.SafeURL(vmodel.IssueURL) } target="_blank"><code>{ vmodel.IssueURL }</code></a>.
						</div>
					</article>
					<script type="text/javascript">
						function clearSummary(projectId) {
							sessionStorage.removeItem(`summary-${projectId}`)
						}
						function openIssue(issueUrl) {
							window.open(issueUrl, "_blank");
						}
					</script>
					@templ.JSFuncCall("clearSummary", vmodel.SelectedProjectID)
					@templ.JSFuncCall("openIssue", vmodel.IssueURL)
				}
				<div class="columns">
					<div class="column is-4">
						<form id="summary-form" action={ common.CurrentURL(ctx) } method="put" hx-disabled-elt="textarea, input, select, button" hx-on:htmx:before-send="savePreferredProject()" hx-indicator="#generation-progress">
							<h2 class="title is-size-2">Résumé de la demande</h2>
							@common.FormSelect(
								vmodel.SummaryForm, "issue-project", "project", "Projet",
								common.WithOptions(projectsToOptions(vmodel.Projects)...),
								common.WithAttrs(
									"hx-get", string(common.CurrentURL(ctx, common.WithoutValues("project", "*"))),
									"hx-target", "body",
									"hx-push-url", "true",
								),
							)
							@common.FormTextarea(
								vmodel.SummaryForm, "issue-summary", "summary", "Résumé",
								common.WithTextareaAttrs(
									"hx-on:change", "onSummaryChange(event)",
								),
							)
							<div class="buttons is-right">
								<button type="submit" class="button is-primary is-large">
									<span class="icon">
										<i class="fa fa-robot"></i>
									</span>
									<span>Générer le ticket</span>
								</button>
							</div>
						</form>
					</div>
					<div class="column">
						<h2 class="title is-size-2">Votre demande</h2>
						<form action={ common.CurrentURL(ctx) } method="post" hx-disabled-elt="textarea, input, select, button" hx-indicator="#generation-progress">
							@common.FormField(vmodel.IssueForm, "issue-title", "title", "Titre")
							@common.FormTextarea(vmodel.IssueForm, "issue-body", "body", "Corps")
							<div class="buttons is-right">
								<button type="submit" class="button is-primary is-large">
									<span class="icon">
										<i class="fa fa-rocket"></i>
									</span>
									<span>Créer le ticket</span>
								</button>
							</div>
						</form>
					</div>
				</div>
				<progress id="generation-progress" class="htmx-indicator progress"></progress>
				if vmodel.IssueTips != "" {
					{{ html := markdownToHTML(ctx, vmodel.IssueTips) }}
					if html != "" {
						<article class="message is-info mt-5">
							<div class="message-header">
								<p><span class="icon"><i class="fa fa-lightbulb"></i></span>Suggestions</p>
								<button class="delete" aria-label="delete" hx-on:click="onCloseMessage(this)"></button>
							</div>
							<div class="message-body">
								<div class="content">
									@templ.Raw(html)
								</div>
							</div>
						</article>
					}
				}
			</section>
		</div>
		<script type="text/javascript">
		function onCloseMessage(closeElement) {
			closeElement.closest('.message').style.display = 'none';
		}

		function onSummaryChange(evt) {
			const summary = evt.currentTarget.value;
			const projectId = document.getElementById("issue-project").value;
			sessionStorage.setItem(`summary-${projectId}`, summary);
		}

		function savePreferredProject() {
			const projectId = document.getElementById("issue-project").value;
			localStorage.setItem(`preferred-project`, projectId);
		}

		function restorePreferredProject() {
			const preferredProject = localStorage.getItem(`preferred-project`);
			if (!preferredProject) return;
			const projectElement = document.getElementById("issue-project");
			if (!projectElement) return;
			if (preferredProject === projectElement.value) return;
			projectElement.value = preferredProject;
			projectElement.dispatchEvent(new Event('change'));
		}

		function restoreLastSummary() {
			const summaryTextarea = document.getElementById("issue-summary");
			if (!summaryTextarea) return;
      const summary = summaryTextarea.value;
			if (summary !== "") return;
			const projectId = document.getElementById("issue-project").value;
			if (!projectId) return;
			const savedSummary = sessionStorage.getItem(`summary-${projectId}`);
			if (!savedSummary) return;
			summaryTextarea.value = savedSummary;
		}

		htmx.onLoad(function(){
			restoreLastSummary();
			restorePreferredProject();
    })
		</script>
	}
}

func projectsToOptions(projects []*model.Project) []string {
	options := make([]string, 0, len(projects)*2)
	for _, p := range projects {
		options = append(options, p.Name, p.ID)
	}
	return options
}

func markdownToHTML(ctx context.Context, text string) string {
	var buff bytes.Buffer
	if err := goldmark.Convert([]byte(text), &buff); err != nil {
		slog.ErrorContext(ctx, "could not convert markdown to html", slog.Any("error", errors.WithStack(err)))
		return ""
	}

	return buff.String()
}