class Ticket {
    constructor(
        id,
        title,
        description,
        status,
        created_at,
        updated_at
    ) {
        this.id = id;
        this.title = title;
        this.description = description;
        this.status = status;
        this.created_at = created_at;
        this.updated_at = updated_at;
    }
}

const Status = {
    OPEN: "open",
    IN_PROGRESS: "in_progress",
    CLOSED: "closed"
};

var tickets = [
    new Ticket(0, "ticket 1", "some desc", Status.CLOSED, 1786438392, 1786438393),
    new Ticket(1, "ticket 2", "some other desc", Status.OPEN, 1786438394, 1786438395),
    new Ticket(2, "ticket 3", "some third desc", Status.OPEN, 1786438396, 1786438397)
];

function get_ticket_by_id(id) {
    target = null;
    tickets.forEach((ticket) => { 
        if (ticket.id == id) {
            target = ticket;
        } 
    }); 
   
    return target; 
}

function get_tickets_by_status(status) {
    target = [];
    tickets.forEach((ticket) => { 
        if (ticket.status == status) {
            target.push(ticket);
        } 
    }); 
   
    return target;
}

const express = require('express');

const app = express();
app.use(express.json());

app.post('/v1/tickets', (req, res) => {
    if (req.body.title == null) {
        res.status(400).send("error: title not provided");
        return;
    }

    if (req.body.description == null) {
        res.status(400).send("error: description not provided");
        return;
    }

    const new_title = req.body.title;
    const new_description = req.body.description;
    const creation_time = Date.now();
    
    const ticket = new Ticket(
        tickets.length,
        new_title,
        new_description,
        Status.OPEN,
        creation_time,
        creation_time
    );
    
    tickets.push(ticket);

    res.send(ticket);
});

app.patch('/v1/tickets/:id', (req, res) => {
    const ticket_idx = tickets.indexOf(get_ticket_by_id(req.params.id));
    const status = req.body.status;    


    if (status == null) {
        res.send(tickets);
        return;
    }

    if (status != Status.OPEN && status != Status.CLOSED && status != Status.IN_PROGRESS) {
        res.status(400).send("error: no such status (only 'open', 'in_progress' or 'closed')");
    } else {
        tickets[ticket_idx].status = status;
        res.send(tickets[ticket_idx]);
    }
});

app.get('/v1/tickets', (req, res) => {
    const status = req.query.status;

    if (status == null) {
        res.send(tickets);
        return;
    }

    if (status != Status.OPEN && status != Status.CLOSED && status != Status.IN_PROGRESS) {
        res.status(400).send("error: no such status (only 'open', 'in_progress' or 'closed')");
    } else {
        const tickets_with_status = get_tickets_by_status(status);
        res.send(tickets_with_status);
    }
});

app.get('/v1/tickets/:id', (req, res) => {
    const ticket_to_send = get_ticket_by_id(req.params.id);

    if (ticket_to_send == null) {
        res.status(400).send("error: no ticket with that id exists :(");
    } else {
        res.send(ticket_to_send);
    }
});

const port = 3000;
app.listen(port, () => {
    console.log(`Server listening on port ${port}`);
});