#!/usr/bin/env node

import {
    FirebaseDocumentInfo,
    getCeremonyCircuits,
    getCircuitContributionsFromContributor,
    getOpenedCeremonies,
    isCoordinator,
    convertToDoubleDigits
} from "@aptos-labs/zk-actions"
import { Firestore } from "firebase/firestore"
import logSymbols from "log-symbols"
import readline from "readline"
import { COMMAND_ERRORS, GENERIC_ERRORS, showError } from "../lib/errors.js"
import { promptForCeremonySelection } from "../lib/prompts.js"
import { bootstrapCommandExecutionAndServices, checkAuth } from "../lib/services.js"
import theme from "../lib/theme.js"
import { customSpinner, getSecondsMinutesHoursFromMillis, sleep } from "../lib/utils.js"

/**
 * Clean cursor lines from current position back to root (default: zero).
 * @param currentCursorPos - the current position of the cursor.
 * @returns <number>
 */
export const cleanCursorPosBackToRoot = (currentCursorPos: number) => {
    while (currentCursorPos < 0) {
        // Get back and clean line by line.
        readline.cursorTo(process.stdout, 0)
        readline.clearLine(process.stdout, 0)
        readline.moveCursor(process.stdout, -1, -1)

        currentCursorPos += 1
    }

    return currentCursorPos
}

/**
 * Show the latest updates for the given circuit.
 * @param firestoreDatabase <Firestore> - the Firestore database to query from.
 * @param ceremony <FirebaseDocumentInfo> - the Firebase document containing info about the ceremony.
 * @param circuit <FirebaseDocumentInfo> - the Firebase document containing info about the circuit.
 * @returns Promise<number> return the current position of the cursor (i.e., number of lines displayed).
 */
export const displayLatestCircuitUpdates = async (
    firestoreDatabase: Firestore,
    ceremony: FirebaseDocumentInfo,
    circuit: FirebaseDocumentInfo
): Promise<number> => {
    let observation = theme.text.bold(`- Circuit # ${theme.colors.magenta(circuit.data.sequencePosition)}`) // Observation output.
    let cursorPos = -1 // Current cursor position (nb. decrease every time there's a new line!).

    const { waitingQueue } = circuit.data

    // Get info from circuit.
    const { currentContributor } = waitingQueue
    const { completedContributions } = waitingQueue

    if (!currentContributor) {
        observation += `\n> Nobody's currently waiting to contribute ${theme.emojis.eyes}`
        cursorPos -= 1
    } else {
        // Search for currentContributor' contribution.
        const contributions = await getCircuitContributionsFromContributor(
            firestoreDatabase,
            ceremony.id,
            circuit.id,
            currentContributor
        )

        if (!contributions.length) {
            // The contributor is currently contributing.
            observation += `\n> Participant ${theme.text.bold(`#${completedContributions + 1}`)} (${theme.text.bold(
                currentContributor
            )}) is currently contributing ${theme.emojis.fire}`

            cursorPos -= 1
        } else {
            // The contributor has contributed.
            observation += `\n> Participant ${theme.text.bold(`#${completedContributions}`)} (${theme.text.bold(
                currentContributor
            )}) has completed the contribution ${theme.emojis.tada}`

            cursorPos -= 1

            // The contributor has finished the contribution.
            const contributionData = contributions.at(0)?.data

            if (!contributionData) showError(GENERIC_ERRORS.GENERIC_ERROR_RETRIEVING_DATA, true)

            // Convert times to seconds.
            const {
                seconds: contributionTimeSeconds,
                minutes: contributionTimeMinutes,
                hours: contributionTimeHours
            } = getSecondsMinutesHoursFromMillis(contributionData?.contributionComputationTime)
            const {
                seconds: verificationTimeSeconds,
                minutes: verificationTimeMinutes,
                hours: verificationTimeHours
            } = getSecondsMinutesHoursFromMillis(contributionData?.verificationComputationTime)

            observation += `\n> The ${theme.text.bold("computation")} took ${theme.text.bold(
                `${convertToDoubleDigits(contributionTimeHours)}:${convertToDoubleDigits(
                    contributionTimeMinutes
                )}:${convertToDoubleDigits(contributionTimeSeconds)}`
            )}`
            observation += `\n> The ${theme.text.bold("verification")} took ${theme.text.bold(
                `${convertToDoubleDigits(verificationTimeHours)}:${convertToDoubleDigits(
                    verificationTimeMinutes
                )}:${convertToDoubleDigits(verificationTimeSeconds)}`
            )}`
            observation += `\n> Contribution ${
                contributionData?.valid
                    ? `${theme.text.bold("VALID")} ${theme.symbols.success}`
                    : `${theme.text.bold("INVALID")} ${theme.symbols.error}`
            }`

            cursorPos -= 3
        }
    }

    // Show observation for circuit.
    process.stdout.write(`${observation}\n\n`)
    cursorPos -= 1

    return cursorPos
}

/**
 * Observe command.
 */
const observe = async () => {
    // @todo to be moved as command configuration parameter.
    const observationWaitingTimeInMillis = 3000
    try {
        // Initialize services.
        const { firebaseApp, firestoreDatabase } = await bootstrapCommandExecutionAndServices()

        // Handle current authenticated user sign in.
        const { user } = await checkAuth(firebaseApp)

        // Preserve command execution only for coordinators].
        if (!(await isCoordinator(user))) showError(COMMAND_ERRORS.COMMAND_NOT_COORDINATOR, true)

        // Get running ceremonies info (if any).
        const runningCeremoniesDocs = await getOpenedCeremonies(firestoreDatabase)

        // Ask to select a ceremony.
        const ceremony = await promptForCeremonySelection(runningCeremoniesDocs, false)

        console.log(`${logSymbols.info} Refresh rate set to ~3 seconds for waiting queue updates\n`)

        let cursorPos = 0 // Keep track of current cursor position.

        const spinner = customSpinner(`Getting ready...`, "clock")
        spinner.start()

        // Get circuit updates every 3 seconds.
        setInterval(async () => {
            // Clean cursor position back to root.
            cursorPos = cleanCursorPosBackToRoot(cursorPos)

            spinner.stop()

            spinner.text = `Updating...`
            spinner.start()

            // Get updates from circuits.
            const circuits = await getCeremonyCircuits(firestoreDatabase, ceremony.id)

            await sleep(observationWaitingTimeInMillis / 10) // Just for a smoother UX/UI experience.

            spinner.stop()

            // Observe changes for each circuit
            for await (const circuit of circuits)
                cursorPos += await displayLatestCircuitUpdates(firestoreDatabase, ceremony, circuit)

            process.stdout.write(`Press CTRL+C to exit`)

            await sleep(1000) // Just for a smoother UX/UI experience.
        }, observationWaitingTimeInMillis)

        await sleep(observationWaitingTimeInMillis) // Wait until the first update.

        spinner.stop()
    } catch (err: any) {
        showError(`Something went wrong: ${err.toString()}`, true)
    }
}

export default observe