import enquirer from "enquirer"
import {watch} from "fs"
import {access, readFile, rename, stat, writeFile} from "fs/promises"
import glob from "fast-glob"
import ini from "ini"
import envPaths from "env-paths"
import chalk from "chalk"
import {isAbsolute, join, normalize, basename} from "path"
import makeDir from "make-dir"
import homeDir from "home-dir"

const {Toggle, Select, Input} = enquirer

function log(message) {
    process.stderr.write(message + "\n")
}

async function getDirectoryFromUser(message, initial) {
    while (true) {
        const newDir = normalize(await new Input({
            message, initial
        }).run())
        if (!isAbsolute(newDir)) {
            log(chalk.red("Can't use that folder: This path must be absolute. Try again."))
            continue
        }
        try {
            const statResult = await stat(newDir)
            if (!statResult.isDirectory()) {
                log(chalk.red("Can't use that folder: This path must be a directory. Try again."))
            }
            return newDir
        } catch (ex) {
            if (ex.code === "ENOENT") {
                const create = await new Toggle({
                    message: "That folder doesn't exist. Want me to create it?",
                    enabled: "Create it",
                    disabled: "No, I'll enter the path again",
                }).run()
                if (!create) {
                    continue
                }
                try {
                    await makeDir(newDir)
                    return newDir
                } catch (ex) {
                    log(chalk.red(`Couldn't create that folder: ${chalk.redBright.bold(ex)}. Try again.`))
                }
            } else {
                log(chalk.red(`Couldn't check on that folder: ${chalk.redBright.bold(ex)}. Try again.`))
            }
        }
    }
}

async function loadPaths(config, home) {
    let sourceDir = process.env.SMVA_SOURCE_DIR || null
    let destDir = process.env.SMVA_DEST_DIR || null
    const configPath = join(config, "smva-indexer.ini")
    if (!(sourceDir && destDir)) {
        try {
            const configText = await readFile(configPath, {encoding: "utf-8"})
            log(chalk.cyan(`Read configuration from ${chalk.cyanBright.bold(configPath)}`))
            const configIni = ini.parse(configText)
            if (!sourceDir && configIni.paths && configIni.paths.source) {
                sourceDir = configIni.paths.source
            }
            if (!destDir && configIni.paths && configIni.paths.dest) {
                destDir = configIni.paths.dest
            }
        } catch (ex) {
            if (ex.code !== "ENOENT") {
                log(chalk.red(`Failed to read configuration from ${chalk.redBright.bold(configPath)}: ${chalk.redBright.bold(ex)}`))
            }
        }
    }
    if (!(sourceDir && destDir)) {
        log(chalk.yellow(`Configuration at ${chalk.yellowBright.bold(configPath)} is missing or incomplete. Configure now.`))
        sourceDir = await getDirectoryFromUser(
            "Where are SMVA saves downloaded to? (e.g., your Downloads folder)",
            sourceDir || join(home, "Downloads"))
        destDir = await getDirectoryFromUser(
            "Where do you want to store your organized SMVA saves? (e.g., your Documents folder)",
            destDir || join(home, "Documents", "SMVA Saves")
        )
        await makeDir(config)
        await writeFile(configPath, ini.encode({paths: {source: sourceDir, dest: destDir}}), {encoding: "utf-8"})
        log(chalk.cyan(`Wrote configuration to ${chalk.cyanBright.bold(configPath)}`))
    }
    return {sourceDir, destDir}
}

async function* watchNewSaves(sourceDir) {
    const sourceRe = /^saint-miluinas-vore-academy-.*\.save$/
    let resolveNext
    let nextPromise

    function makeNewPromise() {
        nextPromise = new Promise((resolve) => {
            resolveNext = (...args) => {
                makeNewPromise()
                resolve(...args)
            }
        })
    }
    makeNewPromise()

    watch(sourceDir, {}, (eventType, filename) => {
        if (eventType === "rename" && sourceRe.test(filename)) {
            resolveNext(join(sourceDir, filename))
        }
    })

    log(chalk.cyan(`Waiting for new saves to appear in ${chalk.cyanBright.bold(sourceDir)}`))

    while (true) {
        yield await nextPromise
    }
}

async function findExistingSaves(sourceDir) {
    const sourceGlob = `${glob.escapePath(sourceDir)}/saint-miluinas-vore-academy-*.save`
    return glob(sourceGlob, {"onlyFiles": true})
}

async function promptForFilename() {
    const saveType = await new Select({
        message: "What type of save is this?",
        choices: ["Useful Save", "Vore Scene", "Skip This Save"],
    }).run()
    const dayPrompt = new Select({
        message: "When is this save from?",
        choices: ["Day 1", "Day 2", "Day 3", "Day 4", "Day 5", "Day 6"]
    })
    if (saveType === "Vore Scene") {
        const voreType = await new Select({
            message: "What type of vore is involved in this save?",
            choices: ["Oral", "Anal", "Unbirth"]
        }).run()
        const voreRole = await new Select({
            message: "What role does the player play in this scene?",
            choices: ["Predator", "Prey", "Observer"]
        }).run()
        const voreResult = await new Select({
            message: "What is the result of the vore?",
            choices: ["Fatal", "Always Fatal", "Non-fatal"],
        }).run()
        const day = await dayPrompt.run()
        const vorePartner = await new Input({
            message: "Who is/are the partner(s) the player is with in this scene?",
        }).run()
        const voreVariant = await new Input({
            message: "What is the variant name/comment for this scene? (leave blank to skip)",
        }).run()
        return `${voreType} ${voreRole} - ${voreResult} - ${day} ${vorePartner}${voreVariant ? ` (${voreVariant})` : ""}.save`
    } else if (saveType === "Useful Save") {
        const day = await dayPrompt.run()
        const title = await new Input({
            message: "What is the title of this useful save?"
        }).run()
        return `Useful Saves - ${day} - ${title}.save`
    } else {
        return null
    }
}

async function shouldDoRename(destPath) {
    try {
        await access(destPath)
        console.log(chalk.yellow(`A file named ${chalk.yellowBright.bold(destPath)} already exists.`))
    } catch (ex) {
        if (ex.code === "ENOENT") {
            return true
        } else {
            console.log(chalk.red(`The file named ${chalk.redBright.bold(destPath)} could not be accessed: ${chalk.redBright.bold(ex)}`))
        }
    }
    const result = await new Select({message: "What should we do?", choices: ["Skip it", "Rename it", "Overwrite it"]}).run();
    switch (result) {
        case "Skip it":
            return false;
        case "Overwrite it":
            return true;
        case "Rename it":
            return (await new Input({message: "What would you like to name the file?", initial: basename(destPath, ".save")}).run()) + ".save"
    }
}

function queueMovingTo(destDir) {
    let resolvePromise, rejectPromise
    const completionPromise = new Promise((resolve, reject) => {
        resolvePromise = resolve
        rejectPromise = reject
    })
    const filequeue = []
    let processingFiles = false

    async function processFiles() {
        if (processingFiles) {
            return
        }
        processingFiles = true
        while (filequeue.length > 0) {
            const nextFile = filequeue[0]
            try {
                access(nextFile)
            } catch (ex) {
                if (ex.code !== "ENOENT") {
                    log(chalk.red(`failed accessing ${chalk.redBright.bold(nextFile)}: ${chalk.redBright.bold(ex)}`))
                }
                filequeue.shift()
                continue
            }
            log(chalk.green(`For save ${chalk.greenBright.bold(nextFile)}:`))
            const destFilename = await promptForFilename()
            if (!destFilename) {
                log(chalk.yellow("Skipped."))
                filequeue.shift()
                continue
            }
            let destPath = join(destDir, destFilename)
            let confirmed = false;
            while (!confirmed) {
                const promptResult = await shouldDoRename(destPath)
                if (typeof promptResult === "string") {
                    destPath = join(destDir, promptResult)
                } else if (!promptResult) {
                    destPath = null
                    confirmed = true
                } else {
                    confirmed = true
                }
            }
            if (!destPath) {
                log(chalk.yellow("Skipped."))
                filequeue.shift()
                continue
            }
            await rename(nextFile, destPath)
            log(chalk.cyan(`Moved to ${chalk.cyanBright.bold(destPath)}`))
            filequeue.shift()
        }
        processingFiles = false
    }

    return {
        push(...files) {
            if (!rejectPromise) {
                throw Error("Already stopped the queue")
            }
            for (const file of files) {
                if (!filequeue.includes(file)) {
                    filequeue.push(file)
                }
            }
            processFiles().catch(() => {
                if (!rejectPromise) {
                    return
                }
                rejectPromise()
                resolvePromise = null
                rejectPromise = null
            })
        },
        complete() {
            if (!resolvePromise) {
                throw Error("Already stopped the queue")
            }
            resolvePromise()
            resolvePromise = null
            rejectPromise = null
        },
        completionPromise
    }
}

async function main() {
    const {config} = envPaths("SMVA-Indexer")
    const home = homeDir()
    const {sourceDir, destDir} = await loadPaths(config, home)
    const queue = queueMovingTo(destDir)

    const existingSavesPromise = (async () => {
        try {
            const existingSaves = await findExistingSaves(sourceDir)
            log(chalk.cyan(`found ${chalk.cyanBright.bold(existingSaves.length)} existing saves`))
            queue.push(...existingSaves)
        } catch (ex) {
            log(chalk.red(`failed searching for existing saves: ${chalk.redBright.bold(ex)}`))
        }
    })()

    const newSavesPromise = (async () => {
        for await (const newSave of watchNewSaves(sourceDir)) {
            queue.push(newSave)
        }
    })()
    await Promise.all([newSavesPromise, existingSavesPromise, queue.completionPromise])
}

main()