import { getNextPassage } from "../tcl.js";

const LAST_PASSAGE_WARNING_THREASHOLD_MS = 30*60*1000;

const TEMPLATE = document.createElement("template");
TEMPLATE.innerHTML = `
<img class="line-picto" src="" />
<h1>
    <span>vers <span class="line-name"></span></span>
    <small class="stop-name"></small>
</h1>
<p class="next-passage">
    Prochain passage <span class="stop-passage-time-relative"></span>
    (<time class="stop-passage-time"></time>)
</p>
<p class="last-passage">
    <span class="next-and-last" >Prochain et </span>Dernier passage <span class="last-passage-time-relative"></span>
    (<time class="last-passage-time"></time>)
</p>
`

class NextBusElement extends HTMLElement {
    #stop
    #autoupdateTimeout

    get stopId(){
        return this.#stop
    }

    set stopId(value){
        this.#stop = value
    }

    handleAutoUpdate(){
        clearTimeout(this.#autoupdateTimeout)
        this.updateContent()
        this.#autoupdateTimeout = setTimeout(this.handleAutoUpdate.bind(this), 60000 + ((Math.random() * 10000) - 5000))
    }

    connectedCallback(){
        this.replaceChildren(TEMPLATE.content.cloneNode(true))
        this.handleAutoUpdate()
    }

    async updateContent(){
        try {
            let nextPassage = await getNextPassage(this.stopId)

            let time = nextPassage.time

            if(!time){
                time = nextPassage.line.timetable.find(it => it.time.getTime() > Date.now())?.time
            }

            if(!time){
                return
            }

            this.querySelector(".line-picto").src = nextPassage.line.picto
            this.querySelector(".line-name").textContent = nextPassage.line.displayName
            this.querySelector(".stop-name").textContent = nextPassage.displayName

            let timeFormatter = new Intl.DateTimeFormat("fr-FR", {
                timeStyle: "short"
            });
            let timeEl = this.querySelector(".stop-passage-time")
            timeEl.textContent = timeFormatter.format(time)

            let relativeTimeFOrmatter = new Intl.RelativeTimeFormat("fr-FR", {
                style: "short",
                numeric: "auto"
            });

            let time_minutes = Math.floor((time.getTime() - Date.now()) / 60000)

            let relative_time_str;
            if(time_minutes > 60) {
                let time_hours = Math.floor(time_minutes / 60)
                time_minutes -= time_hours * 60

                relative_time_str = relativeTimeFOrmatter.format(
                    time_hours,
                    "hours"
                )
                if(time_minutes > 0){
                    relative_time_str += ` et ${Math.abs(time_minutes)} min`
                }
            } else {
                relative_time_str = relativeTimeFOrmatter.format(
                    time_minutes,
                    "minutes"
                )
            }
            this.querySelector(".stop-passage-time-relative").textContent = relative_time_str

            {
                let last_passage = nextPassage.getLastPassageTime()
                if(last_passage){
                    let time = last_passage.time
                    let timeEl = this.querySelector(".last-passage-time")
                    timeEl.textContent = timeFormatter.format(time)
    
                    let time_minutes = Math.floor((time.getTime() - Date.now()) / 60000)
    
                    let relative_time_str;
                    if(time_minutes > 60) {
                        let time_hours = Math.floor(time_minutes / 60)
                        time_minutes -= time_hours * 60
    
                        relative_time_str = relativeTimeFOrmatter.format(
                            time_hours,
                            "hours"
                        )
                        if(time_minutes > 0){
                            relative_time_str += ` et ${Math.abs(time_minutes)} min`
                        }
                    } else {
                        relative_time_str = relativeTimeFOrmatter.format(
                            time_minutes,
                            "minutes"
                        )
                    }
                    this.querySelector(".last-passage-time-relative").textContent = relative_time_str
                    this.querySelector(".last-passage").style.display = ""
                    this.querySelector(".last-passage").classList.toggle("warning", (time.getTime() - Date.now()) <= LAST_PASSAGE_WARNING_THREASHOLD_MS)
                } else {
                    this.querySelector(".last-passage").style.display = "none"
                }

                if(last_passage && last_passage.time.getTime() == time.getTime()){
                    this.querySelector(".next-and-last").style.display = ""
                    this.querySelector(".next-passage").style.display = "none"
                } else {
                    this.querySelector(".next-and-last").style.display = "none"
                    this.querySelector(".next-passage").style.display = ""
                }
            }

            this.style.display = ""
        } catch(e){
            this.style.display = "none"
            throw e
        }
    }

    static observedAttributes = ["stop-id"]

    attributeChangedCallback(name, oldVal, newVal){
        switch(name){
            case "stop-id":
                this.stopId = newVal
                break;
        }
    }
}

customElements.define("gavle-next-bus", NextBusElement);