class PlayerNotFoundError extends Error {
    constructor(message) {
        if (!message) {
            message = "Player not found";
        }
        super(message);
        this.name = "PlayerNotFoundError";
    }
}

class PlayerInactiveError extends Error {
    constructor(message) {
        if (!message) {
            message = "Player kicked out due to inactivity";
        }
        super(message);
        this.name = "PlayerInactiveError";
    }
}

class PositionError extends Error {
    constructor(message) {
        if (!message) {
            message = "Position out of bounds or collision with an object";
        }
        super(message);
        this.name = "PositionError";
    }
}

const Direction = {
    LEFT: "left",
    RIGHT: "right",
    UP: "up",
    DOWN: "down",
};

class FairHopper {
    constructor(host, port) {
        this.host = host;
        this.port = port;

        this.defaultHeaders = {
            Accept: "application/json",
            "Content-Type": "application/json",
        };
    }

    formatUrl(path) {
        return `${this.host}:${this.port}${path}`;
    }

    async ping() {
        const r = await fetch(this.formatUrl("/ping"), {
            headers: this.defaultHeaders,
        });
        return await r.json();
    }

    async startGame(playerName) {
        const payload = {
            player_name: playerName,
        };
        const r = await fetch(this.formatUrl("/game"), {
            method: "post",
            headers: this.defaultHeaders,
            body: JSON.stringify(payload),
        });
        return await r.json();
    }

    async getGameInfo() {
        const r = await fetch(this.formatUrl("/game"), {
            headers: this.defaultHeaders,
        });
        return await r.json();
    }

    async getPlayerInfo(playerId) {
        const r = await fetch(this.formatUrl(`/player/${playerId}`), {
            headers: this.defaultHeaders,
        });
        switch (r.status) {
            case 403:
                throw new PlayerInactiveError();
            case 404:
                throw new PlayerNotFoundError();
        }
        return await r.json();
    }

    async moveLeft(playerId) {
        return await this.move(playerId, "left");
    }

    async moveRight(playerId) {
        return await this.move(playerId, "right");
    }

    async moveUp(playerId) {
        return await this.move(playerId, "up");
    }

    async moveDown(playerId) {
        return await this.move(playerId, "down");
    }

    async move(playerId, direction) {
        const url = this.formatUrl(`/player/${playerId}/move/${direction}`);
        const r = await fetch(url, {
            method: "post",
            headers: this.defaultHeaders,
        });
        switch (r.status) {
            case 403:
                throw new PlayerInactiveError();
            case 404:
                throw new PlayerNotFoundError();
            case 409:
                throw new PositionError();
        }
        return await r.json();
    }

    async getProducts() {
        const r = await fetch(this.formatUrl("/products"), {
            headers: this.defaultHeaders,
        });
        return await r.json();
    }

    async purchaseProduct(playerId, productId) {
        const url = this.formatUrl(`/player/${playerId}/product/purchase`);
        const postData = {
            product_id: productId,
        };
        const r = await fetch(url, {
            method: "post",
            headers: this.defaultHeaders,
            body: JSON.stringify(postData),
        });
        switch (r.status) {
            case 403:
                throw new PlayerInactiveError();
            case 404:
                throw new PlayerNotFoundError();
            case 409:
                throw new PositionError();
        }
        return await r.json();
    }
}

module.exports = {
    FairHopper,
    PlayerNotFoundError,
    PlayerInactiveError,
    PositionError,
    Direction,
};