const canvas = document.getElementById("game")
const ctx = canvas.getContext("2d");

const width = 640
const height = 480

function lerp(a, b, alpha) {
    return a + alpha * ( b - a )
}

const server_ip = document.getElementById("server-ip")
const server_nick = document.getElementById("server-nick")
const connect_server = document.getElementById("connect-server")
const server_error = document.getElementById("server-error")

const allowed_key_to_send = [
    "KeyR", "KeyW", "KeyE", "KeyQ", "KeyS",
    "Numpad1", "Numpad2", "Numpad3", "Numpad4", "Numpad5",
    "Numpad6", "Numpad7", "Numpad8", "Numpad9", "Numpad0",
    "ShiftLeft", "ControlLeft", "Enter",
    "F1", "F2", "KeyZ", "KeyX", "KeyC"
]

connect_server.onclick = () => {
    let ip = server_ip.value
    let nick = server_nick.value

    server_error.innerText = ""

    if (ip.length == 0) {
        server_error.innerText = "введите айпи пж"
        return
    }

    if (nick.length == 0) {
        server_error.innerText = "введите ник пж"
        return
    }

    if (!ip.includes(":")) {
        ip += ":8000"
    }

    if (typeof player.socket !== "undefined") {
        player.socket.close()
    }

    player.on_connect(nick)

    blocks = []

    try {
        let socket = new WebSocket(
            "ws://"+ip,
            "cubic",
        )

        socket.onopen = e => {
            socket.send("J"+nick);
            player.socket = socket
        }

        socket.onmessage = e => {
            player.recv_packet(e.data)
        }

        socket.onclose = e => {
            player.socket = undefined
            reset_world()
        }

        socket.onerror = () => {
            server_error.innerText = "Connection closed due to error"
            reset_world()
        }
    } catch (exception) {
        server_error.innerText = exception
    }
}

function wrapText(ctx, text, maxWidth) {
    const lines = [];
    let currentLine = '';

    for (let i = 0; i < text.length; i++) {
        const char = text[i];
        const testLine = currentLine + char;
        const testWidth = ctx.measureText(testLine).width;

        if (testWidth > maxWidth && currentLine) {
            lines.push(currentLine);
            currentLine = char;
        } else {
            currentLine = testLine;
        }
    }

    if (currentLine) {
        lines.push(currentLine);
    }

    return lines;
}

var ticksAlive = 0

var debugMode = false

var camera = {
    x: 0.0,
    y: 0.0,
    size: 1.5
}

var chatOpened = false
var chatMessages = []
var chatTyping = ""

class Block {
    constructor(x, y, color, collides, type) {
        this.x = x
        this.y = y
        this.color = color
        this.collides = collides
        this.type = type
    }

    render() {
        let rect = this.translate_to_camera()
        if (this.is_need_render(rect)) {
            ctx.fillStyle = this.color
            ctx.fillRect(...rect)
        }
    }

    is_need_render(rect) {
        return rect[0] + rect[2] > 0 || rect[1] + rect[3] > 0 || rect[0] < width || rect[1] < height
    }

    translate_to_camera() {
        let size = camera.size * 16

        return [
            this.x * size - size / 2 + (width / 2 - camera.x * size),
            height - (this.y + 1) * size + size / 2 - (height / 2 - camera.y * size),
            size,
            size
        ]
    }

    tick() {

    }

    tick_render() {

    }

    on_collide(player, x, y) {
        if (x != 0) player.velocity_x = this.x + x - player.x
        if (y != 0) player.velocity_y = this.y + y - player.y
    }

    text_render() {

    }
}

class Player extends Block {
    constructor(x, y, name, color, velocity_x, velocity_y) {
        super(x, y, color, true, null)

        this.velocity_x = velocity_x
        this.velocity_y = velocity_y

        this.name = name
    }

    on_collide(player, x, y) {
        super.on_collide(player, x, y)
        // if (x != 0) {
        //     player.vel_x *= 0.5
        //     this.vel_x = player.vel_x
        // }
        // if (y != 0) {
        //     player.vel_y *= 0.5
        //     this.vel_y = player.vel_y
        // }
    }

    tick(collide=true) {
        this.x = Math.round(this.x * 100) / 100
        this.y = Math.round(this.y * 100) / 100
        this.velocity_x = Math.round(this.velocity_x * 100) / 100
        this.velocity_y = Math.round(this.velocity_y * 100) / 100

        if (collide) this.collide()
    }

    collide() {
        this.on_ground = false

        for (const block of blocks) {
            if (!block.collides) continue

            let collide_x = 0
            let collide_y = 0

            if (this.x > block.x-1 && this.x < block.x+1) {
                if (this.y > block.y && this.y + this.velocity_y - 1 < block.y) {
                    this.on_ground = true
                    collide_y = 1
                }
                if (this.y < block.y && this.y + this.velocity_y > block.y - 1) collide_y = -1
            }

            if (this.y > block.y-1 && this.y < block.y+1) {
                if (this.x > block.x && this.x + this.velocity_x - 1 < block.x) collide_x = 1
                if (this.x < block.x && this.x + this.velocity_x > block.x - 1) collide_x = -1
            }

            block.on_collide(this, collide_x, collide_y)
        }
    }

    tick_render() {
        this.velocity_x *= 0.5
        this.velocity_y *= 0.5
        this.x += this.velocity_x
        this.y += this.velocity_y
    }

    text_render() {
        super.text_render()

        let rect = this.translate_to_camera()

        if (this.is_need_render(rect)) {
            ctx.fillStyle = "#ddd"
            ctx.font = "15px monospace";
            let width = ctx.measureText(this.name).width
            ctx.fillText(this.name,rect[0]+rect[2]/2-width/2, rect[1]-5);
        }
    }

    teleport(x, y) {
        this.velocity_x = x - this.x
        this.velocity_y = y - this.y
    }

    force_teleport(x, y) {
        this.x = x
        this.y = y
        this.velocity_x = 0
        this.velocity_y = 0
    }
}

class MainPlayer extends Player {
    constructor() {
        super(0.0, 0.0, "unnamed player", "#5e6", 0, 0)

        this.init()

        this.socket = undefined
    }

    init() {
        this.walk_speed = 1
        this.jump_speed = 2
        this.gravity_speed = 0.5

        this.controls_x = 0
        this.controls_jump = 0
        this.on_ground = false

        this.block_type = null
        this.all_block_types = [
            "normal", "normal", "normal", "normal", "normal",
            "normal", "normal", "normal", "normal", "normal"
        ]
    }

    on_connect(name) {
        this.x = 0.0
        this.y = 0.0
        this.velocity_x = 0.0
        this.velocity_y = 0.0

        camera.x = 0.0
        camera.y = 0.0

        chatOpened = false
        chatMessages = []

        this.name = name
        this.color = "#5e6"

        this.init()
    }

    register() {
        document.addEventListener("keydown", (e) => {
            let key = e.code

            if (chatOpened) {
                if (key == "Backspace") {
                    chatTyping = chatTyping.slice(0, chatTyping.length-1)
                } else if (key == "Enter") {
                    if (chatTyping == "") {
                        chatOpened = false
                        return
                    }
                    this.send_packet("M", chatTyping)
                    chatTyping = ""
                    chatOpened = false
                } else if (key == "Escape") {
                    chatOpened = false
                } else if (e.key.length == 1) {
                    chatTyping += e.key
                    e.preventDefault()
                    return false
                }
            } else {
                if (key == "KeyD") {
                    this.controls_x = 1
                    this.send_packet("C","W","2")
                } else if (key == "KeyA") {
                    this.controls_x = -1
                    this.send_packet("C","W","1")
                } else if (key == "Space") {
                    this.controls_jump = true
                    this.send_packet("C","J","1")
                    e.preventDefault()
                    return false
                } else if (key == "KeyR") {
                    if (typeof this.socket === "undefined") {
                        this.force_teleport(0, 1)
                    }
                } else if (key == "KeyT") {
                    chatOpened = true
                }

                if (e.key == "0") this.block_type = null
                if ("123456789".includes(e.key)) this.block_type = this.all_block_types[parseInt(e.key)-1]

                if (allowed_key_to_send.includes(key)) {
                    this.send_packet("K",key,"1")
                }

                if (key == "Escape") {
                    if (typeof this.socket !== "undefined") {
                        this.socket.close()
                    }
                }
            }

            if (key == "F3") {
                debugMode = !debugMode
                e.preventDefault()
                return false
            }
        })

        document.addEventListener("keyup", (e) => {
            let key = e.code

            if ((key == "KeyD" && this.controls_x == 1)
                    || (key == "KeyA" && this.controls_x == -1)) {
                this.controls_x = 0
                this.send_packet("C","W","0")
            } else if (key == "Space" && this.controls_jump) {
                this.controls_jump = false
                this.send_packet("C","J","0")
            }

            if (allowed_key_to_send.includes(key)) {
                this.send_packet("K",key,"0")
            }
        })

        canvas.addEventListener("wheel", e => {
            if (e.deltaY > 0) {
                camera.size *= 0.5 * (e.deltaY/114)
            } else {
                camera.size *= 2 * (e.deltaY/-114)
            }
            e.preventDefault()
            return false
        })

        canvas.addEventListener("mousedown", e => {
            let rect = canvas.getBoundingClientRect()
            let size = 16 * camera.size
            let x = Math.round((e.clientX - rect.x) / size - (width / size / 2) + camera.x)
            let y = Math.round((height - (e.clientY - rect.y)) / size - (height / size / 2) + camera.y)

            if (e.buttons == 2 && this.block_type != null) {
                if (typeof this.socket === "undefined") {
                    placeBlock(new Block(x,y,"#555",true,this.block_type))
                }
                this.send_packet("P",x,y,this.block_type)
            } else if (e.buttons == 1) {
                if (typeof this.socket === "undefined") {
                    removeBlock(x, y)
                }
                this.send_packet("D",x,y)
            }
        })
    }

    recv_packet(packet) {
        let packet_id = packet[0]
        let packet_data = packet.slice(1).split("\n")

        console.log(packet_id, packet_data)

        if (packet_id == "K") {
            server_error.innerText = packet_data[0]
            this.socket.close()
            this.socket = null
        }

        if (packet_id == "N") {
            this.name = packet_data[0]
        }

        if (packet_id == "C") {
            this.color = packet_data[0]
        }

        if (packet_id == "M") {
            chatMessages.unshift(...packet_data)
        }

        if (packet_id == "P") {
            let x = parseFloat(packet_data[0])
            let y = parseFloat(packet_data[1])
            if (Math.abs(x - this.x) > 2) this.x = x
            if (Math.abs(y - this.y) > 2) this.y = y
        }

        if (packet_id == "V") {
            let x = parseFloat(packet_data[0])
            let y = parseFloat(packet_data[1])
            if (Math.abs(x - this.velocity_x) > 2) this.velocity_x = x
            if (Math.abs(y - this.velocity_y) > 2) this.velocity_y = y
        }

        if (packet_id == "S") {
            let speed_type = packet_data[0]
            let speed = parseFloat(packet_data[1])

            if (speed_type == "W") {
                this.walk_speed = speed
            } else if (speed_type == "J") {
                this.jump_speed = speed
            } else if (speed_type == "G") {
                this.gravity_speed = speed
            }
        }

        if (packet_id == "W") {
            for (const data of packet_data) {
                let type = data[0]
                let create = data[1] == "1"
                let params = data.slice(2).split(",")

                if (type == "B") {
                    let x = parseFloat(params[0])
                    let y = parseFloat(params[1])

                    if (create) {
                        let collides = params[2] == "1"
                        let type = params[3]
                        let color = params[4]

                        let block = getBlock(x, y)
                        if (block != null) {
                            block.x = x
                            block.y = y
                            block.color = color
                            block.collides = collides
                            block.type = type
                        } else {
                            placeBlock(new Block(x,y,color,collides,type))
                        }
                    } else {
                        removeBlock(x, y)
                    }
                } else if (type == "P") {
                    let name = params[0]

                    if (create) {
                        let x = parseFloat(params[1])
                        let y = parseFloat(params[2])
                        let vel_x = parseFloat(params[3])
                        let vel_y = parseFloat(params[4])
                        let color = params[5]

                        let player = getPlayer(name)
                        if (player != null) {
                            player.x = x
                            player.y = y
                            player.color = color
                            player.velocity_x = vel_x
                            player.velocity_y = vel_y
                        } else {
                            placeBlock(new Player(x,y,name,color,vel_x,vel_y))
                        }
                    } else {
                        removePlayer(name)
                    }
                }
            }
        }

        if (packet_id == "B") {
            this.all_block_types = packet_data.slice(0, 9)
            this.block_type = null
        }
    }

    send_packet(id, ...params) {
        if (typeof this.socket === "undefined") {
            return
        }
        this.socket.send(id+params.join("\n"))
    }

    tick() {
        super.tick(false)

        this.velocity_x += this.controls_x * this.walk_speed

        if (this.controls_jump && this.on_ground) {
            this.velocity_y += this.jump_speed
            this.on_ground = false
        } else {
            this.velocity_y -= this.gravity_speed
        }

        this.collide()

        ticksAlive++
    }

    render() {
        super.render()

        camera.x = Math.round(lerp(camera.x, this.x, 0.075) * 1000) / 1000
        camera.y = Math.round(lerp(camera.y, this.y, 0.075) * 1000) / 1000
    }

    text_render() {
        super.text_render()

        if (this.block_type != null) {
            ctx.fillStyle = "#76d"
            ctx.font = "15px monospace";
            ctx.fillText("selected: "+this.block_type, 0, 15);
        }

        if (debugMode) {
            ctx.fillStyle = "#de7"
            ctx.font = "20px monospace";
            ctx.fillText("x: "+this.x, 0, 20);
            ctx.fillText("y: "+this.y, 0, 40);
            ctx.fillText("velocity_x: "+this.velocity_x, 0, 60);
            ctx.fillText("velocity_y: "+this.velocity_y, 0, 80);
            ctx.fillText("camera.x: "+camera.x, 0, 100);
            ctx.fillText("camera.y: "+camera.y, 0, 120);
        }


        if (!chatOpened) {
            ctx.fillStyle = "#22222288"
            ctx.fillRect(5, height - 35, width * 0.4, 30)

            ctx.fillStyle = "#aaaaaa88"
            ctx.font = "15px monospace";
            ctx.fillText("Нажмите T для чата", 15, height - 15);
        } else {
            ctx.fillStyle = "#22222288"
            ctx.fillRect(5, height - 35, width -10, 30)

            ctx.save();

            ctx.beginPath();
            ctx.moveTo(5, height - 35);
            ctx.lineTo(width - 5 , height - 35);
            ctx.lineTo(width - 5, height - 5);
            ctx.lineTo(5, height - 5);
            ctx.lineTo(5, height - 35);
            ctx.closePath();

            ctx.clip();

            ctx.font = "15px monospace"
            if (chatTyping.length == 0) {
                ctx.fillStyle = "#aaaaaa88"
                ctx.fillText("Напишите сообщение...", 15, height - 15);
            } else {
                ctx.fillStyle = "#ffffff"
                let text_width = ctx.measureText(chatTyping).width
                ctx.fillText(chatTyping, Math.min(10, width - text_width - 10), height - 15)
            }

            ctx.restore();
        }

        if (chatMessages.length > 0) {
            let draw_message = (message) => {
                let lines = wrapText(ctx, message, message_width - 20)
                let height = lines.length * 20 + 5 + 5

                let top = message_bottom - height

                ctx.fillStyle = "#22222288"
                ctx.fillRect(5, top, message_width, height)

                let y = 5
                for (let line of lines) {
                    ctx.fillStyle = "#ffffff"
                    ctx.fillText(line, 15, top+y+15);
                    y += 5 + 20
                }

                message_bottom -= height + 5
            }

            let message_width = width * 0.4
            let message_bottom = height - 35 - 5

            if (chatOpened) {
                chatMessages.forEach(draw_message)
            } else {
                draw_message(chatMessages[0])
            }
        }
    }
}

var player = new MainPlayer()
player.register()

var blocks = []

blocks.push(new Block(-1, -1, "#555", true));
blocks.push(new Block(0, -1, "#a67", true));
blocks.push(new Block(1, -1, "#555", true));

function reset_world() {
    player.on_connect("unnamed player")
    blocks = []
    blocks.push(new Block(-1, -1, "#555", true));
    blocks.push(new Block(0, -1, "#a67", true));
    blocks.push(new Block(1, -1, "#555", true));
}

function getBlock(x, y) {
    let value = blocks.find(o => !(o instanceof Player) && o.x == x && o.y == y)
    if (typeof value === "undefined") {
        return null
    } else {
        return value
    }
}

function placeBlock(block) {
    blocks.push(block);
}

function removeBlock(x, y) {
    blocks = blocks.filter(o => o instanceof Player || o.x != x || o.y != y)
}

function getPlayer(name) {
    let value = blocks.find(o => o instanceof Player && o.name == name)
    if (typeof value === "undefined") {
        return null
    } else {
        return value
    }
}

function removePlayer(name) {
    blocks = blocks.filter(o => !(o instanceof Player) || o.name != name)
}

setInterval(() => {
    for (const block of blocks)
        block.tick()
    player.tick()
}, 1000 / 20)

setInterval(() => {
    for (const block of blocks)
        block.tick_render()
    player.tick_render()
}, 1000 / 60)

let renderTimer = () => {
    ctx.fillStyle = "#333";
    ctx.fillRect(0, 0, width, height);

    for (const block of blocks)
        block.render()
    for (const block of blocks)
        block.text_render()
    player.render()
    player.text_render()

    requestAnimationFrame(renderTimer)
}

requestAnimationFrame(renderTimer)