const utils = require("../modules/utils")
const authRepository = require("../repositories/authRepository")
const sessionRepository = require("../repositories/sessionsRepository")
const { DefaultError } = require("../errors/errors")

async function registerLegacySession({ uuid, sessionId }) {
    try {
        await sessionRepository.insertLegacyClientSessions(sessionId, uuid)
        return { code: 200 }
    } catch (error) {
        if (error instanceof DefaultError) throw error
        throw new DefaultError(500, "Internal Server Error", error.toString())
    }
}

async function validateLegacySession({ name, sessionId }) {
    let userResult
    try {
        userResult = await authRepository.getUser(name)
    } catch (error) {
        if (error.code === 404) {
            throw error
        }
        throw error
    }

    try {
        await sessionRepository.validateLegacyClientSession(sessionId, userResult.user.uuid)
        return { code: 200 }
    } catch (error) {
        if (error.code === 404) {
            throw new DefaultError(403, "Invalid session.", "ForbiddenOperationException")
        }
        throw error
    }
}

async function getBlockedServers() {
    try {
        return await sessionRepository.getBlockedServers()
    } catch (error) {
        throw new DefaultError(500, "Unable to fetch blocked servers.", error.toString())
    }
}

async function getProfile({ uuid, unsigned = false }) {
    let userResult, $uuid = utils.addDashesToUUID(uuid)
    try {
        userResult = await authRepository.getUser($uuid, false)
    } catch (error) {
        if (error.code === 404) {
            return { code: 204, message: "User not found" }
        }
        throw error
    }

    const dbUser = userResult.user
    const username = dbUser.username
    const cleanUuid = dbUser.uuid.replace(/-/g, "")

    const [skinResult, capeResult, actionsResult] = await Promise.all([
        sessionRepository.getActiveSkin(dbUser.uuid).catch(() => ({ data: null })), 
        sessionRepository.getActiveCape(dbUser.uuid).catch(() => ({ data: null })),
        sessionRepository.getProfileActionsList(dbUser.uuid).catch(() => ({ data: [] }))
    ])

    const activeSkin = skinResult.data[0]
    const activeCape = capeResult.data[0]
    const profileActions = actionsResult.data || []

    const isSkinBanned = profileActions.includes("USING_BANNED_SKIN")
    const hasValidSkin = activeSkin && !isSkinBanned
    const hasValidCape = !!activeCape

    const skinNode = hasValidSkin ? {
        url: (process.env.TEXTURES_ENDPOINTS || `http://localhost:${process.env.WEB_PORT}/textures`) + activeSkin.url,
        metadata: activeSkin.variant === "SLIM" ? { model: "slim" } : undefined
    } : undefined

    const capeNode = hasValidCape ? {
        url: (process.env.TEXTURES_ENDPOINTS || `http://localhost:${process.env.WEB_PORT}/textures`) + activeCape.url
    } : undefined

    const texturesObject = {
        ...(skinNode && { SKIN: skinNode }),
        ...(capeNode && { CAPE: capeNode })
    }

    const texturePayload = {
        timestamp: Date.now(),
        profileId: cleanUuid,
        profileName: username,
        signatureRequired: !unsigned,
        textures: texturesObject
    }

    const payloadJson = JSON.stringify(texturePayload)
    const base64Value = Buffer.from(payloadJson).toString("base64")

    const signature = unsigned ? null : utils.signProfileData(base64Value)

    const propertyNode = {
        name: "textures",
        value: base64Value,
        ...(signature && { signature: signature })
    }

    return {
        code: 200,
        data: {
            id: cleanUuid,
            name: username,
            properties: [propertyNode],
            profileActions: profileActions
        }
    }
}

async function joinServer({ accessToken, selectedProfile, clientToken, serverId, ip }) {
    try {
        await authRepository.validateClientSession(accessToken, clientToken)
    } catch (error) {
        throw new DefaultError(403, "Invalid access token", "ForbiddenOperationException")
    }
    await sessionRepository.saveServerSession(selectedProfile, accessToken, serverId, ip)
    return { code: 204 }
}

async function hasJoinedServer({ username, serverId, ip }) {
    let userResult
    try {
        userResult = await authRepository.getUser(username, false)
    } catch (error) {
        if (error.code === 404) return { code: 204, message: "User not found" }
        throw error
    }

    const { uuid } = userResult.user
    const joinCheck = await sessionRepository.getServerSession(uuid, serverId)

    if (joinCheck.code !== 200 || !joinCheck.valid) {
        return { code: 204, message: "Join verification failed" }
    }

    if (ip && ip.trim() !== "" && joinCheck.ip !== ip) {
        return { code: 204, message: "Invalid IP address" }
    }

    return await getProfile({ 
        uuid: uuid, 
        unsigned: false 
    })
}

async function joinLegacyServer({ name, sessionId, serverId }) {
    try {
        await validateLegacySession({ name, sessionId })
    } catch (error) {
        throw new DefaultError(403, "Bad login", "ForbiddenOperationException")
    }

    const userResult = await authRepository.getUser(name)
    const uuid = userResult.user.uuid

    await sessionRepository.saveServerSession(uuid, sessionId, serverId, "0.0.0.0") 

    return { code: 200, message: "OK" }
}

async function getActiveSkin({ username }) {
    try {
        const dbUser = await authRepository.getUser(username)
        const activeSkin = await sessionRepository.getActiveSkin(dbUser.user.uuid)
        return activeSkin
    } catch (error) {
        if (!(error instanceof DefaultError)) {
            throw new DefaultError(400, "Bad Request", error.toString())
        }
        throw error
    }
}

async function getActiveCape({ username }) {
    try {
        const dbUser = await authRepository.getUser(username)
        const activeCape = await sessionRepository.getActiveCape(dbUser.user.uuid)
        return activeCape
    } catch (error) {
        if (!(error instanceof DefaultError)) {
            throw new DefaultError(400, "Bad Request", error.toString())
        }
        throw error
    }
}

module.exports = {
    getProfile,
    joinServer,
    getActiveCape,
    getActiveSkin,
    hasJoinedServer,
    joinLegacyServer,
    getBlockedServers,
    registerLegacySession,
    validateLegacySession,
}