const API_URL = "https://api.slopfarmer.jack-case.pro"
let access_token

const login_form = document.getElementById("login-form")
if(login_form) {
    login_form.addEventListener("submit", (event) => {event.preventDefault(); submit_login_form()})
}

function setup_storage_db() {
    /* create indexeddb object store to retain objects in the form of
     * {"domain": "domain.tld",
     *  "paths": [
     *      "page/1",
     *      "page/2"  
     *  ]
     * }
     */  
    let db
    const db_request = window.indexedDB.open("SlopDB", 1)

    db_request.onerror = (event) => {
        // handle error
        console.log(event)
    }

    db_request.onsuccess = (event) => {
        // create objectstore
        console.log(event)
        db = event.target.result
    }

    db_request.onupgradeneeded = (event) => {
        console.log(event)
        db = event.target.result
        const slop_store = db.createObjectStore("slop", {keyPath: "domain"})
    }
}

function on_install_handler() {
    setup_storage_db()
}

async function get_slop_store(readwrite) {

    const slop_store_promise = new Promise((resolve, reject) => {
        const db_request = window.indexedDB.open("SlopDB", 1)

        db_request.onsuccess = (event) => {
            const db = event.target.result
            const transaction = db.transaction(["slop"], readwrite ? "readwrite" : undefined)
            const slop_store = transaction.objectStore("slop")
            resolve(slop_store)
        }
        db_request.onerror = (event) => {
            reject(event)
        }
    })

    return await slop_store_promise    
}

async function insert_slop(domain, path) {
    let db
    const db_request = window.indexedDB.open("SlopDB", 1)

    db_request.onsuccess = (event) => {
        db = event.target.result
        const transaction = db.transaction(["slop"], "readwrite")
        const slop_store = transaction.objectStore("slop")

        // is this domain already stored?
        const request = slop_store.get(domain)
        request.onsuccess = (event) => {
            let result = request.result
            if (result) {
                // domain exists, add this path
                result.paths.add(path)
            }
            
            else {
                // create a new domain object
                const paths_set = new Set()
                paths_set.add(path)
                result = {domain: domain, paths: paths_set}
            }

            // persist to indexeddb
            const store_request = slop_store.put(result)
            store_request.onsuccess = (event) => {
                console.log(domain, path, "stored")
            }
        }
    }

    const report_url = new URL("/report", API_URL)
    const request = new Request(report_url, 
        {
            method: "POST", 
            headers: {
                "Content-Type": "application/json", 
                "Bearer": get_access_token()
            }, 
            body: JSON.stringify({slop_urls: [new URL(path, "http://"+domain).toString()]})
        })
    fetch(request)
}

async function check_local_slop(url) {
    const slop_url = new URL(url)
    const slop_store = await get_slop_store(false)
    const known_slop = new Promise((resolve, reject) => {
        const request = slop_store.get(slop_url.hostname)
        request.onsuccess = (event) => {
            resolve(request.result)
        }
        request.onerror = (event) => {
            reject(event)
        }
    })

    const slop_object = await known_slop
    let result = {slop_domain: false, slop_path: false}
    if (slop_object) {
        // domain was found
        result.slop_domain = true
        if (slop_object.paths.has(slop_url.pathname)) {
            // specific page was found
            result.slop_path = true
        }
    }

    return result
}

async function check_remote_slop(urls) {
    const check_url = new URL("/check", API_URL)
    const request = new Request(check_url, {method: "POST", headers: { "Content-Type": "application/json", "Bearer": get_access_token() }, body: JSON.stringify({slop_urls: urls})})
    const response = await fetch(request)
    let domain_objects = await response.json()
    domain_objects.forEach((domain) => {insert_slop(domain.domain_name, "/")})
    return domain_objects
}

async function on_button_clicked_handler(tab) {
    // insert the current tab's page into slop storage
    const tab_url = new URL(tab.url)

    const domain = tab_url.hostname
    const path = tab_url.pathname

    insert_slop(domain, path)
}

async function update_page_action_icon(details) {
    if(details.frameId != 0) {
        return
    }
    const is_slop = await check_local_slop(details.url)
    if(is_slop.slop_path) {
        browser.pageAction.setIcon({
            path: "icons/virus_red.png",
            tabId: details.tabId
        })
    }
    else if(is_slop.slop_domain) {
        browser.pageAction.setIcon({
            path: "icons/virus_yellow.png",
            tabId: details.tabId
        })
    }
    else {
        browser.pageAction.setIcon({
            path: "icons/virus-slash.png",
            tabId: details.tabId
        })
    }
    console.log(is_slop)
}

async function message_listener(message, sender) {
    const tabid = sender.tab.id
    if (message.type === "check") {
        let check_promises = new Array()
        let not_found_local = new Array()
       
        message.urls.forEach((url) => {
            check_promises.push(check_local_slop(url).then(async (result) => {
                if (result.slop_domain) {
                    browser.tabs.sendMessage(tabid, { type: "check_result", url: url, result: result })
                }
                else {
                    not_found_local.push(url)
                }
            }))
        })

        await Promise.all(check_promises)

        let remote_slop = await check_remote_slop(not_found_local)
        remote_slop.forEach((result) => {
            browser.tabs.sendMessage(tabid, { type: "check_result", url: result.url, result: result })
        })
    }
}

function get_access_token() {
    access_token = localStorage.getItem("accessToken")
    if (!access_token) {
        // get an access token from the API
    }
    return access_token
}

async function submit_login_form() {

    const login_url = new URL("/login", API_URL)

    const request = new Request(login_url, 
        { 
            method: "POST", 
            body: new FormData(login_form)
        })

    const response = await fetch(request)

    if(response.ok) {
        const body = await response.json()
        const token = body.access_token
        localStorage.setItem("accessToken", token)
    }

}

if(!login_form) {
    browser.runtime.onInstalled.addListener(on_install_handler)
    browser.runtime.onStartup.addListener(get_access_token)
    browser.pageAction.onClicked.addListener(on_button_clicked_handler)
    browser.webNavigation.onCommitted.addListener(update_page_action_icon)
    browser.runtime.onMessage.addListener(message_listener)
}