(function(window) {
    function isPromise(o) {
        return o instanceof Promise
    }

    var web3 = {
        _callbacks: {},
        _events: {},
        providers: {},
        toHex: function(str) {
            var hex = "";
            for(var i = 0; i < str.length; i++) {
                var n = str.charCodeAt(i).toString(16);
                hex += n.length < 2 ? '0' + n : n;
            }

            return hex;
        },

        toAscii: function(hex) {
            // Find termination
            var str = "";
            var i = 0, l = hex.length;
            for(; i < l; i+=2) {
                var code = hex.charCodeAt(i)
                if(code == 0) {
                    break;
                }

                str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
            }

            return str;
        },

        fromAscii: function(str, pad) {
            if(pad === undefined) {
                pad = 32
            }

            var hex = this.toHex(str);

            while(hex.length < pad*2)
                hex += "00";

            return hex
        },

        eth: {
            prototype: Object(),

            block: function(numberOrHash) {
                return new Promise(function(resolve, reject) {
                    var call = typeof numberOrHash === "string" ? 'blockByHash' : 'blockByNumber';
                    web3.provider.send({call: call, args: [numberOrHash]}, function(block) {
                        if(block)
                            resolve(block);
                        else
                            reject("not found");
                    });
                });
            },

            transaction: function(numberOrHash, nth) {
                return new Promise(function(resolve, reject) {
                    var call = typeof numberOrHash === "string" ? 'transactionByHash' : 'transactonByNumber';
                    web3.provider.send({call: call, args: [numberOrHash, nth]}, function(block) {
                        if(block)
                            resolve(block);
                        else
                            reject("not found");
                    });
                });
            },

            uncle: function(numberOrHash, nth) {
                return new Promise(function(resolve, reject) {
                    var call = typeof numberOrHash === "string" ? 'uncleByHash' : 'uncleByNumber';
                    web3.provider.send({call: call, args: [numberOrHash, nth]}, function(block) {
                        if(block)
                            resolve(block);
                        else
                            reject("not found");
                    });
                });
            },

            transact: function(params) {
                if(params === undefined) {
                    params = {};
                }

                if(params.endowment !== undefined)
                    params.value = params.endowment;
                if(params.code !== undefined)
                    params.data = params.code;


                var promises = []
                if(isPromise(params.to)) {
                    promises.push(params.to.then(function(_to) { params.to = _to; }));
                }
                if(isPromise(params.from)) {
                    promises.push(params.from.then(function(_from) { params.from = _from; }));
                }

                if(typeof params.data !== "object" || isPromise(params.data)) {
                    params.data = [params.data]
                }

                var data = params.data;
                for(var i = 0; i < params.data.length; i++) {
                    if(isPromise(params.data[i])) {
                        var promise = params.data[i];
                        var _i = i;
                        promises.push(promise.then(function(_arg) { params.data[_i] = _arg; }));
                    }
                }

                // Make sure everything is string
                var fields = ["value", "gas", "gasPrice"];
                for(var i = 0; i < fields.length; i++) {
                    if(params[fields[i]] === undefined) {
                        params[fields[i]] = "";
                    }
                    params[fields[i]] = params[fields[i]].toString();
                }

                // Load promises then call the last "transact".
                return Promise.all(promises).then(function() {
                    return new Promise(function(resolve, reject) {
                        params.data = params.data.join("");
                        web3.provider.send({call: "transact", args: [params]}, function(data) {
                            if(data[1])
                                reject(data[0]);
                            else
                                resolve(data[0]);
                        });
                    });
                })
            },

            compile: function(code) {
                return new Promise(function(resolve, reject) {
                    web3.provider.send({call: "compile", args: [code]}, function(data) {
                        if(data[1])
                            reject(data[0]);
                        else
                            resolve(data[0]);
                    });
                });
            },

            balanceAt: function(address) {
                var promises = [];

                if(isPromise(address)) {
                    promises.push(address.then(function(_address) { address = _address; }));
                }

                return Promise.all(promises).then(function() {
                    return new Promise(function(resolve, reject) {
                        web3.provider.send({call: "balanceAt", args: [address]}, function(balance) {
                            resolve(balance);
                        });
                    });
                });
            },

            countAt: function(address) {
                var promises = [];

                if(isPromise(address)) {
                    promises.push(address.then(function(_address) { address = _address; }));
                }

                return Promise.all(promises).then(function() {
                    return new Promise(function(resolve, reject) {
                        web3.provider.send({call: "countAt", args: [address]}, function(count) {
                            resolve(count);
                        });
                    });
                });
            },

            codeAt: function(address) {
                var promises = [];

                if(isPromise(address)) {
                    promises.push(address.then(function(_address) { address = _address; }));
                }

                return Promise.all(promises).then(function() {
                    return new Promise(function(resolve, reject) {
                        web3.provider.send({call: "codeAt", args: [address]}, function(code) {
                            resolve(code);
                        });
                    });
                });
            },

            storageAt: function(address, storageAddress) {
                var promises = [];

                if(isPromise(address)) {
                    promises.push(address.then(function(_address) { address = _address; }));
                }

                if(isPromise(storageAddress)) {
                    promises.push(storageAddress.then(function(_sa) { storageAddress = _sa; }));
                }

                return Promise.all(promises).then(function() {
                    return new Promise(function(resolve, reject) {
                        web3.provider.send({call: "stateAt", args: [address, storageAddress]}, function(entry) {
                            resolve(entry);
                        });
                    });
                });
            },

            stateAt: function(address, storageAddress) {
                return this.storageAt(address, storageAddress);
            },

            call: function(params) {
                if(params === undefined) {
                    params = {};
                }

                if(params.endowment !== undefined)
                    params.value = params.endowment;
                if(params.code !== undefined)
                    params.data = params.code;


                var promises = []
                if(isPromise(params.to)) {
                    promises.push(params.to.then(function(_to) { params.to = _to; }));
                }
                if(isPromise(params.from)) {
                    promises.push(params.from.then(function(_from) { params.from = _from; }));
                }

                if(isPromise(params.data)) {
                    promises.push(params.data.then(function(_code) { params.data = _code; }));
                } else {
                    if(typeof params.data === "object") {
                        data = "";
                        for(var i = 0; i < params.data.length; i++) {
                            data += params.data[i]
                        }
                    } else {
                        data = params.data;
                    }
                }

                // Make sure everything is string
                var fields = ["value", "gas", "gasPrice"];
                for(var i = 0; i < fields.length; i++) {
                    if(params[fields[i]] === undefined) {
                        params[fields[i]] = "";
                    }
                    params[fields[i]] = params[fields[i]].toString();
                }

                // Load promises then call the last "transact".
                return Promise.all(promises).then(function() {
                    return new Promise(function(resolve, reject) {
                        web3.provider.send({call: "call", args: params}, function(data) {
                            if(data[1])
                                reject(data[0]);
                            else
                                resolve(data[0]);
                        });
                    });
                })
            },

            watch: function(params) {
                return new Filter(params);
            },
        },

        on: function(event, cb) {
            if(web3._events[event] === undefined) {
                web3._events[event] = [];
            }

            web3._events[event].push(cb);

            return this
        },

        off: function(event, cb) {
            if(web3._events[event] !== undefined) {
                var callbacks = web3._events[event];
                for(var i = 0; i < callbacks.length; i++) {
                    if(callbacks[i] === cb) {
                        delete callbacks[i];
                    }
                }
            }

            return this
        },

        trigger: function(event, data) {
            var callbacks = web3._events[event];
            if(callbacks !== undefined) {
                for(var i = 0; i < callbacks.length; i++) {
                    // Figure out whether the returned data was an array
                    // array means multiple return arguments (multiple params)
                    if(data instanceof Array) {
                        callbacks[i].apply(this, data);
                    } else {
                        callbacks[i].call(this, data);
                    }
                }
            }
        },
    };

    var eth = web3.eth;
    // Eth object properties
    Object.defineProperty(eth, "gasPrice", {
        get: function() {
            return "10000000000000"
        }
    });

    Object.defineProperty(eth, "coinbase", {
        get: function() {
            return new Promise(function(resolve, reject) {
                web3.provider.send({call: "coinbase"}, function(coinbase) {
                    resolve(coinbase);
                });
            });
        },
    });

    Object.defineProperty(eth, "listening", {
        get: function() {
            return new Promise(function(resolve, reject) {
                web3.provider.send({call: "listening"}, function(listening) {
                    resolve(listening);
                });
            });
        },
    });


    Object.defineProperty(eth, "mining", {
        get: function() {
            return new Promise(function(resolve, reject) {
                web3.provider.send({call: "mining"}, function(mining) {
                    resolve(mining);
                });
            });
        },
    });

    Object.defineProperty(eth, "peerCount", {
        get: function() {
            return new Promise(function(resolve, reject) {
                web3.provider.send({call: "peerCount"}, function(peerCount) {
                    resolve(peerCount);
                });
            });
        },
    });

    var ProviderManager = function() {
        this.queued = [];
        this.ready = false;
        this.provider = undefined;
        this.id = 1;
    };
    ProviderManager.prototype.send = function(data, cb) {
        data._id = this.id;
        if(cb) {
            web3._callbacks[data._id] = cb;
        }

        if(data.args === undefined) {
            data.args = [];
        }

        this.id++;

        if(this.provider !== undefined) {
            this.provider.send(data);
        } else {
            this.queued.push(data);
        }
    };

    ProviderManager.prototype.set = function(provider) {
        if(this.provider !== undefined && this.provider.unload !== undefined) {
            this.provider.unload();
        }

        this.provider = provider;
        this.ready = true;
    };

    ProviderManager.prototype.sendQueued = function() {
        for(var i = 0; this.queued.length; i++) {
            // Resend
            this.send(this.queued[i]);
        }
    };

    ProviderManager.prototype.installed = function() {
        return this.provider !== undefined;
    };
    web3.provider = new ProviderManager();

    web3.setProvider = function(provider) {
        provider.onmessage = messageHandler;

        web3.provider.set(provider);

        web3.provider.sendQueued();
    };

    var filters = [];
    var Filter = function(options) {
        filters.push(this);

        this.callbacks = [];
        this.options = options;

        var call;
        if(options === "chain") {
            call = "newFilterString"
        } else if(typeof options === "object") {
            call = "newFilter"
        }

        var self = this; // Cheaper than binding
        this.promise = new Promise(function(resolve, reject) {
            web3.provider.send({call: call, args: [options]}, function(id) {
                self.id = id;

                resolve(id);
            });
        });
    };

    Filter.prototype.changed = function(callback) {
        var self = this;
        this.promise.then(function(id) {
            self.callbacks.push(callback);
        });
    };

    Filter.prototype.trigger = function(messages, id) {
        if(id == this.id) {
            for(var i = 0; i < this.callbacks.length; i++) {
                this.callbacks[i].call(this, messages);
            }
        }
    };

    Filter.prototype.uninstall = function() {
        this.promise.then(function(id) {
            web3.provider.send({call: "uninstallFilter", args:[id]});
        });
    };

    Filter.prototype.messages = function() {
        var self=this;
        return Promise.all([this.promise]).then(function() {
            var id = self.id
            return new Promise(function(resolve, reject) {
                web3.provider.send({call: "getMessages", args: [id]}, function(messages) {
                    resolve(messages);
                });
            });
        });
    };

    // Register to the messages callback. "messages" will be emitted when new messages
    // from the client have been created.
    web3.on("messages", function(messages, id) {
        for(var i = 0; i < filters.length; i++) {
            filters[i].trigger(messages, id);
        }
    });

    function messageHandler(data) {

        if(data._event !== undefined) {
            web3.trigger(data._event, data.data);
        } else {
            if(data._id) {
                var cb = web3._callbacks[data._id];
                if(cb) {
                    cb.call(this, data.data)

                    // Remove the "trigger" callback
                    delete web3._callbacks[ev._id];
                }
            }
        }
    }

    /*
    // Install default provider
    if(!web3.provider.installed()) {
        var sock = new web3.WebSocket("ws://localhost:40404/eth");

        web3.setProvider(sock);
    }
    */

    window.web3 = web3;
})(this);