import {Fetcher} from "openapi-typescript-fetch"
import type {paths} from "../api/schema"

const fetcher = Fetcher.for<paths>()

const list: HTMLDivElement = document.querySelector("#list")!
const template: HTMLTemplateElement = document.querySelector("#template-door")!

export type DoorType = {
    id: string;
    label: string;
    state: "unlocked" | "locked" | "unknown" | "unlocking" | "locking";
    batteryLow: boolean;
    unreachable: boolean;
    jammed: boolean;
}

export type AuthType = {
    username: string;
    authorized: boolean;
    authenticated: boolean;
    until: Date | null;
    recentLogout: boolean;
}

declare global {
    interface Window {
        lang: string;
        doors: Array<DoorType>;
        auth: AuthType;
        doorAction: (action: 'unlock' | 'lock', doorId: string) => void;
    }
}

const auth: AuthType = {
    username: "user",
    authorized: true,
    authenticated: false,
    until: null,
    recentLogout: false,
}

const apiError: {
    current: "serverError" | "networkError" | null;
} = {
    current: null,
}

const loading: {
    doors: boolean;
    auth: boolean;
} = {
    doors: false,
    auth: false,
}

const timeouts: Record<string, number | null> = {
    auth: null,
}

const doors: Array<DoorType> = []

window.doors = doors
window.auth = auth

function triggerAuthTimeout() {
    const diff = auth.until ? (auth.until.getTime() - new Date().getTime()) : 0

    if (timeouts.auth) clearTimeout(timeouts.auth)
    timeouts.auth = setTimeout(checkUser, diff)
}

function loadAuthFromLocalStorage() {
    if (localStorage.getItem("auth")) {
        const localAuth = JSON.parse(localStorage.getItem("auth")!)
        auth.recentLogout = localAuth.recentLogout // set recentLogout true, if user was logged in before
        auth.authenticated = localAuth.authenticated
        auth.authorized = localAuth.authorized
        auth.until = localAuth.until ? new Date(localAuth.until) : null
        auth.username = localAuth.username
    }
}

async function checkUser() {
    if (!auth.authenticated) {
        loading.auth = true
    }

    const getUserInfo = fetcher.path("/api/user-info/").method("get").create()

    try {
        const {data: userInfo} = await getUserInfo({})

        apiError.current = null
        auth.authenticated = true
        auth.authorized = userInfo.is_authorized
        auth.until = userInfo.guaranteed_session_until ? new Date(userInfo.guaranteed_session_until) : null
        auth.username = userInfo.username ?? ""
        auth.recentLogout = false

        triggerAuthTimeout()
    } catch (e) {
        // check which operation threw the exception
        if (e instanceof getUserInfo.Error) {
            const error = e.getActualType()

            if (error.status === 401) {
                if (!auth.recentLogout)
                    auth.recentLogout = auth.authenticated // set recentLogout true, if user was logged in before
                auth.authenticated = false
                auth.authorized = false
                auth.until = null
                auth.username = ""
            } else if (error.status >= 500 && error.status < 600) {
                apiError.current = "serverError"
            } else {
                console.error("unknown error:", error)
            }
        }
    } finally {
        localStorage.setItem("auth", JSON.stringify(auth))
        loading.auth = false
        refresh()
    }
}

async function fetchDoors() {
    if (doors.length === 0) {
        loading.doors = true
    }
    refresh()
    const getDoors = fetcher.path("/api/locks/").method("get").create()

    try {
        const {data: doorInfo} = await getDoors({})

        apiError.current = null
        while (doors.length) {
            doors.pop()
        }
        doorInfo.forEach(door => {
            let state: DoorType["state"] = "unknown"

            switch (door.status.activity_state) {
                case "locking":
                case "unlocking":
                case "unknown":
                    state = door.status.activity_state
                    break
                case "stable":
                    state = door.status.lock_state
            }

            doors.push({
                id: door.id,
                label: door.name,
                state: state,
                batteryLow: door.status.is_low_battery,
                unreachable: door.status.is_unreachable,
                jammed: door.status.is_error_jammed,
            })
        })
    } catch (e) {
        // check which operation threw the exception
        if (e instanceof getDoors.Error) {
            const error = e.getActualType()

            if (error.status === 401) {
                console.log("unauthorized")
            } else if (error.status >= 500 && error.status < 600) {
                apiError.current = "serverError"
                clearInterval(doorsInterval)
            } else {
                console.error("unknown error:", error)
            }
        }

        if (e instanceof Error) {
            switch (e.name) {
                case "TypeError":
                    apiError.current = "networkError"
            }
        }
    } finally {
        loading.doors = false
        refresh()
    }
}

async function doorAction(action: "unlock" | "lock", doorId: string) {
    const operateDoors = fetcher.path("/api/locks/{lock_id}").method("patch").create()

    const stateMap: Record<string, "open" | "closed"> = {
        unlock: "open",
        lock: "closed",
    }

    operateDoors({
        lock_id: doorId,
        desired_state: stateMap[action],
    })
}

window.doorAction = doorAction

function setDoorInfo(doorElement: HTMLDivElement, door: DoorType, initial: boolean = false) {
    const labelElement: HTMLDivElement = doorElement.querySelector("[data-label]")!
    const lockButton: HTMLButtonElement = doorElement.querySelector("[data-button='lock']")!
    const unlockButton: HTMLButtonElement = doorElement.querySelector("[data-button='unlock']")!
    const buttonElements: Array<HTMLButtonElement> = [lockButton, unlockButton]

    doorElement.dataset.id = door.id
    doorElement.dataset.state = door.state

    if (auth.authenticated && auth.authorized) {
        doorElement.dataset.active = ""
    } else {
        delete doorElement.dataset.active
    }

    if (door.batteryLow) {
        doorElement.dataset.battery = ""
    } else {
        delete doorElement.dataset.battery
    }

    if (door.unreachable) {
        doorElement.dataset.unreachable = ""
    } else {
        delete doorElement.dataset.unreachable
    }

    if (door.jammed) {
        doorElement.dataset.jammed = ""
    } else {
        delete doorElement.dataset.jammed
    }

    labelElement.innerHTML = door.label

    if (initial) {
        lockButton.addEventListener("click", () => {
            doorAction("lock", door.id)
        })

        unlockButton.addEventListener("click", () => {
            doorAction("unlock", door.id)
        })
    }

    buttonElements.forEach(button => {
        button.disabled = ["unlocking", "locking"].includes(door.state) || apiError.current !== null
    })
}

function refresh() {
    for (const door of doors) {
        let doorElement: HTMLDivElement | null = list.querySelector(`[data-id='${door.id}']`)
        if (doorElement) {
            setDoorInfo(doorElement, door)
            continue
        }

        const targetElement = document.importNode(template.content, true)
        doorElement = targetElement.querySelector("[data-state]")!
        setDoorInfo(doorElement, door, true)
        list.appendChild(targetElement)
    }

    const alertUnauthenticated: HTMLDivElement = document.querySelector("#alert-unauthenticated")!
    const alertUnauthorized: HTMLDivElement = document.querySelector("#alert-unauthorized")!
    const alertLoggedout: HTMLDivElement = document.querySelector("#alert-loggedout")!
    const alertServerError: HTMLDivElement = document.querySelector("#alert-serverError")!
    const alertNetworkError: HTMLDivElement = document.querySelector("#alert-networkError")!
    const alertDivider: HTMLDivElement = document.querySelector("#alert-divider")!
    const badgeUsername: HTMLDivElement = document.querySelector("#badge-username")!
    const buttonLogin: HTMLDivElement = document.querySelector("#button-login")!
    const usernameElement: HTMLSpanElement = badgeUsername.querySelector("#username")!
    const loadingDoors: HTMLDivElement = document.querySelector("#loading-doors")!

    alertUnauthenticated.classList.toggle("hidden", auth.authenticated || auth.recentLogout)
    alertUnauthorized.classList.toggle("hidden", !auth.authenticated || auth.authorized)
    alertLoggedout.classList.toggle("hidden", !auth.recentLogout)
    alertServerError.classList.toggle("hidden", apiError.current !== "serverError")
    alertNetworkError.classList.toggle("hidden", apiError.current !== "networkError")
    alertDivider.classList.toggle("hidden", auth.authenticated && auth.authorized && !auth.recentLogout && apiError.current === null || doors.length === 0)
    badgeUsername.classList.toggle("hidden", !auth.authenticated)
    usernameElement.innerHTML = auth.username
    buttonLogin.classList.toggle("hidden", auth.authenticated)
    loadingDoors.classList.toggle("hidden", !loading.doors)
}


loadAuthFromLocalStorage()
const doorsInterval = setInterval(fetchDoors, 250) // TODO: replace with SSE
checkUser()

document.addEventListener("loadeddata", () => {
    refresh()
})