package widget

import (
	"context"
	"html/template"
	"strconv"
	"time"

	"github.com/glanceapp/glance/internal/assets"
	"github.com/glanceapp/glance/internal/feed"
)

func statusCodeToText(status int) string {
	if status == 200 {
		return "OK"
	}
	if status == 404 {
		return "Not Found"
	}
	if status == 403 {
		return "Forbidden"
	}
	if status == 401 {
		return "Unauthorized"
	}
	if status >= 400 {
		return "Client Error"
	}
	if status >= 500 {
		return "Server Error"
	}

	return strconv.Itoa(status)
}

func statusCodeToStyle(status int) string {
	if status == 200 {
		return "ok"
	}

	return "error"
}

type Monitor struct {
	widgetBase `yaml:",inline"`
	Sites      []struct {
		*feed.SiteStatusRequest `yaml:",inline"`
		Status                  *feed.SiteStatus `yaml:"-"`
		Title                   string           `yaml:"title"`
		IconUrl                 string           `yaml:"icon"`
		IsSimpleIcon            bool             `yaml:"-"`
		SameTab                 bool             `yaml:"same-tab"`
		StatusText              string           `yaml:"-"`
		StatusStyle             string           `yaml:"-"`
	} `yaml:"sites"`
	ShowFailingOnly bool `yaml:"show-failing-only"`
	HasFailing      bool `yaml:"-"`
}

func (widget *Monitor) Initialize() error {
	widget.withTitle("Monitor").withCacheDuration(5 * time.Minute)

	for i := range widget.Sites {
		widget.Sites[i].IconUrl, widget.Sites[i].IsSimpleIcon = toSimpleIconIfPrefixed(widget.Sites[i].IconUrl)
	}

	return nil
}

func (widget *Monitor) Update(ctx context.Context) {
	requests := make([]*feed.SiteStatusRequest, len(widget.Sites))

	for i := range widget.Sites {
		requests[i] = widget.Sites[i].SiteStatusRequest
	}

	statuses, err := feed.FetchStatusForSites(requests)

	if !widget.canContinueUpdateAfterHandlingErr(err) {
		return
	}

	widget.HasFailing = false

	for i := range widget.Sites {
		site := &widget.Sites[i]
		status := &statuses[i]
		site.Status = status

		if status.Code >= 400 || status.TimedOut || status.Error != nil {
			widget.HasFailing = true
		}

		if !status.TimedOut {
			site.StatusText = statusCodeToText(status.Code)
			site.StatusStyle = statusCodeToStyle(status.Code)
		}
	}
}

func (widget *Monitor) Render() template.HTML {
	return widget.render(widget, assets.MonitorTemplate)
}