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var IDBWrapper = require("idb-wrapper")
, extend = require("xtend")
, getCallback = require("./utils/getCallback")
, getOptions = require("./utils/getOptions")

, defaultOptions = {
encoding: 'utf8'
, keys: true
, values: true
}

module.exports = idbup

function idbup(path, defaults, callback) {
var db = extend(new Object(), {
put: onOpen(put)
, del: onOpen(del)
, get: onOpen(get)
, batch: onOpen(batch)
, open: open
, close: close
, isOpen: isOpen
, isClosed: isClosed
})
, idb
, status = "new"

if (typeof defaults === "function") {
callback = defaults
defaults = {}
}

defaults = extend({}, defaultOptions, defaults || {})


open(callback)

return db

function put(key, value, options, callback) {
callback = getCallback(options, callback)
options = getOptions(defaults, options)
idb.put({
value: value
, id: key
}, function () {
callback && callback(null)
}, callback)
}

function del(key, options, callback) {
callback = getCallback(options, callback)
options = getOptions(defaults, options)

idb.remove(key, function () {
callback && callback(null)
}, callback)
}

function get(key, options, callback) {
callback = getCallback(options, callback)
options = getOptions(defaults, options)

idb.get(key, function (result) {
callback && callback(null, result, key)
}, callback)
}

function batch(arr, options, callback) {
callback = getCallback(options, callback)
options = getOptions(defaults, options)
var _arr = arr.map(function (item) {
var result = {}
, key = item.key

if (item.type === "del") {
result.type = "remove"
} else if (item.type === "put") {
result.type = "put"
result.value = {
value: item.value
, id: key
}
}

result.key = key

return result
})

idbBatch.call(idb, _arr, function () {
callback && callback()
}, callback)
}

function open(options, callback) {
if (!options) callback = options
if (status === "opening") {
db.on("ready", callback)
} else if (status === "opened") {
close(_open)
} else {
_open()
}

function _open(err) {
if (err) {
return callback(err)
}

status = "opening"

idb = new IDBWrapper(extend({
storeName: path
}, defaults), function () {
status = "opened"
callback && callback(null, db)
})
}
}

function close(callback) {
if (status === "opened") {
_close()
} else if (status === "opening") {
db.on("ready", _close)
} else if (status === "closed") {
callback && callback()
} else if (status === "new") {
var err = new Error("cannot close unopened db")
if (callback) {
return callback(err)
}
}

function _close() {
idb.db.close()
idb = null
status = "closed"
callback && callback()
}
}

function isOpen() {
return status === "opened"
}

function isClosed() {
return status === "closed"
}

function onReady(callback) {
if (status === "opened") {
callback(idb)
} else {
db.on("ready", callback)
}
}

function onOpen(operation) {
return function opened() {
var args = arguments

onReady(function () {
operation.apply(null, args)
})
}
}

// IDBWrapper batch implementation inlined.
// Waiting for pull request
function idbBatch(arr, onSuccess, onError) {
onError || (onError = function (error) {
console.error('Could not apply batch.', error);
});
onSuccess = onSuccess || noop;
var batchTransaction = this.db.transaction(
[this.storeName] , this.consts.READ_WRITE);
var count = arr.length;
var called = false;

arr.forEach(function (operation) {
var type = operation.type;
var key = operation.key;
var value = operation.value;

if (type === "remove") {
var deleteRequest = batchTransaction
.objectStore(this.storeName).delete(key);
deleteRequest.onsuccess = function (event) {
count--;
if (count === 0 && !called) {
called = true;
onSuccess();
}
};
deleteRequest.onerror = function (err) {
batchTransaction.abort();
if (!called) {
called = true;
onError(err);
}
};
} else if (type === "put") {
if (typeof value[this.keyPath] === 'undefined' &&
!this.features.hasAutoIncrement
) {
value[this.keyPath] = this._getUID()
}
var putRequest = batchTransaction
.objectStore(this.storeName).put(value)
putRequest.onsuccess = function (event) {
count--;
if (count === 0 && !called) {
called = true;
onSuccess();
}
};
putRequest.onerror = function (err) {
batchTransaction.abort();
if (!called) {
called = true;
onError(err);
}
};
}
}, this);
}

function noop() {}
}