let bot
let mcData
let quiet
// import v from 'vec3'
const v = require('vec3')

let cfg = {
    info: {
        quiet: quiet,
        recentCommand: null,
    },
    // to satisfy typescript
    quiet: null,
    bot: bot
}

var RelativePosEnum
(function (RelativePosEnum) {
    RelativePosEnum[RelativePosEnum["feet"] = 0] = "feet"
    RelativePosEnum[RelativePosEnum["standing"] = 1] = "standing"
    RelativePosEnum[RelativePosEnum["head"] = 2] = "head"
    RelativePosEnum[RelativePosEnum["looking"] = 3] = "looking"
    RelativePosEnum[RelativePosEnum["infront"] = 4] = "infront"
    RelativePosEnum[RelativePosEnum["behind"] = 5] = "behind"
})(RelativePosEnum || (RelativePosEnum = {}))

function relPosToBlock(entity, relPos) {
    let pos
    if (!(relPos in RelativePosEnum)) return console.warn("info: not a relative position:", relPos)
    relPos = typeof relPos === "number" ? RelativePosEnum[relPos] : relPos
    switch (relPos) {
        case "feet":
            pos = entity.position;
            break
        case "standing":
            pos = entity.position.offset(0, -1, 0)
            break
        // todo use CARDINAL directions api from pathfinder
        // case "behind":
        //     entity.yaw
        //     pos = entity.position
        //     break
        // case "front":
        // case "infront":
        //     pos = entity.position
        //     break
        case "head":
            pos = entity.position.offset(0, 1.85, 0)
            break
        case "looking":
            if (entity === bot.entity) {
                return bot.blockAtCursor()
                // return bot.blockInSight(128, 128)
            }
        default:
            quiet || bot.chat(`info: pos '${relPos}' not implemented`)
            break
    }
    if (pos) {
        // nearest block
        return bot.blockAt(pos)
    }
}

function isVec3(vec) {
    return vec?.length === 3 || vec.x && vec.y && vec.z
}

function block(entity = bot.entity, pos = entity?.position?.offset(0, -1, 0)) {
    console.assert(pos || entity)
    const block = isVec3(pos) ? bot.blockAt(v(pos))
        : typeof pos === "string" ? relPosToBlock(entity, RelativePosEnum[pos]) : pos
    console.log(block, block?.getProperties && block.getProperties())
    if (!block) {
        quiet || bot.chat("empty block")
        return block
    }
    bot.lookAt(block?.position)
    let info = [block.type, block.name]
    if (block.metadata) info.push(Object.entries(block.getProperties()))
    quiet || bot.chat(info.join(": "))
}

function item(
    entity = bot.entity,
    slot = entity.heldItem
) {
    const item = typeof slot === "number" ?
        bot.inventory.slots[slot + bot.QUICK_BAR_START] :
        slot
    console.log("info item:", item)
    if (!item) {
        quiet || bot.chat("no item")
        return item
    }
    let info = [item.type, item.name, item.count]
    if (item.metadata) info.push("meta: " + item.metadata.length)
    if (item.nbt) {
        info.push(compound_value(item.nbt))
    }
    quiet || bot.chat(info.join("; "))
    function compound_value(obj) {
        if (typeof obj.value == "object") {
            return compound_value(obj.value)
        } else if (obj.value) {
            return obj.value
        } else if (typeof obj == "object") {
            const keys = Object.keys(obj)
            return keys.map(key => {
                return `${key}: ${compound_value(obj[key])}`
            });
        } else {
            return obj
        }
    }
    return item
}

function entity(name = bot.nearestEntity()) {
    const entity = typeof name === "string" ? (name = name.toLowerCase()) && bot.nearestEntity((entity) => {
        const enames = [entity.username?.toLowerCase(), entity.name, entity.displayName?.toLowerCase()]
        return enames.includes(name)
    }) : name
    console.log("info entity:", entity)
    if (!entity) {
        quiet || bot.chat("no entity")
        return entity
    }
    let info = [entity.type, entity.username || entity.name]
    // TODO various info depending on the type of entity; player, villager, etc
    if (entity.metadata) info.push("len: " + entity.metadata.length)
    quiet || bot.chat(info.join("; "))
    return entity
}

function blockOrItemFromId(num, quiet = cfg.info.quiet) {
    const block = mcData?.blocks[num]
    const item = mcData?.items[num]
    // const entity = mcData?.entities[num]
    if (block || item) {
        quiet || bot.chat(
            (block && `block: ${block.name}, ` || "")
            + (item && `item: ${item.name}, ` || "")
            // + (entity && `entity: ${entity.name}, ` || "")
        )
    } else {
        quiet || bot.chat("info: nonexistent block or item")
    }
    return { block, item }
}

function command(message_parts, player) {
    if (message_parts.length > 0) {
        cfg.info.recentCommand = message_parts
    }
    if (player === null)
        player = void 0
    switch (message_parts.length) {
        case 0:
            if (cfg.info.recentCommand) {
                command(cfg.info.recentCommand, player)
            } else {
                // TODO dispatch on instance of entity, block, etc..
                // TODO have the logic inside the function or with a utility function
                block()
            }
            break;
        case 1:
            switch (message_parts[0]) {
                case "quiet":
                    cfg.info.quiet = quiet = !quiet;
                    quiet || bot.chat(`info: ${quiet ? "" : "not "}being quiet`);
                    break;
                case "i":
                case "item":
                    item()
                    break
                case "e":
                case "entity":
                    entity()
                    break
                case "me":
                    block(player)
                    break
                case "b":
                case "block":
                    block()
                    break
                default:
                    const num = parseInt(message_parts[0])
                    if (isFinite(num)) {
                        blockOrItemFromId(num)
                    } else {
                        quiet || bot.chat("info usage: `!info [me|i|e|b|<num>|quiet]`")
                    }
                    break;
            }

            break;

        case 2:
            switch (message_parts[0]) {
                case "i":
                case "item":
                    switch (message_parts[1]) {
                        case "me":
                            item(player)
                            break
                        default:
                            const slot = parseInt(message_parts[1])
                            slot && item(undefined, slot)
                            break
                    }
                    break
                case "b":
                case "block":
                    switch (message_parts[1]) {
                        case "me":
                            block(player)
                            break
                        default:
                            if (message_parts[1] in RelativePosEnum) {
                                block(undefined, message_parts[1])
                            } else {
                                // or entity(message_parts[1]).position
                                console.log(bot.players[message_parts[1]])
                                quiet || bot.chat("info: not yet implemented")
                            }
                    }
                    break
                case "e":
                case "entity":
                default:
                    entity(message_parts[1])
                    break;
            }
            break

        case 4:
            switch (message_parts[0]) {
                case "b":
                case "block":
                default:
                    block(undefined, message_parts.slice(1))
                    break;
            }

            break;

        default:
            cfg.quiet || bot.chat("info: unknown command")
            break;
    }
}

const load = (config) => {
    config.info = cfg.info
    cfg = config
    bot = cfg.bot
    mcData = bot.mcData || (bot.mcData = require('minecraft-data')(bot.version))
}

const unload = () => {}

module.exports = { load, unload, command, block, item, entity }