from app.models import db

def agents():

    """
    Build the list of all agents, with their charges summed up in one total
    :return:
    """

    sql_txt = """
            select a.id, a.firstname, a.secondname, sum(tc.charge_rate) as total_charge
            from agent as a left join
               ( select c.agent_id, c.charge_rate from charge c )
            tc
            on a.id = tc.agent_id
            group by a.id
            order by total_charge desc;
            """

    all_agents = db.session.execute(sql_txt).fetchall()

    return all_agents

def charges_by_agent_tabled(agent_id):
    """
    Build the flatten list of charges for one agent, period by period
    :param agent_id:
    :return:
    """
    req_sql = f"""
            select p.name as period_name,
                   p2.name as project_name,
                   s.name as service_name,
                   c2.name as capacity_name,
                   c.charge_rate as charge_rate
            from charge as c
                     join period p on c.period_id = p.id
                     join project p2 on c.project_id = p2.id
                     join service s on c.service_id = s.id
                     join agent a on a.id = c.agent_id
                     join capacity c2 on c2.id = c.capacity_id
            where agent_id = {agent_id}
            order by c.period_id
            """
    req_res = db.session.execute(req_sql)
    results = list(req_res)
    # Remove comma
    nocomma_results = []
    for line in results:
        nocomma_line = (str(cell) for cell in line)
        nocomma_results.append(nocomma_line)
    headers = ("Period", "Project", "Service", "Capacity", "Charge")
    nocomma_results.insert(0, headers)
    return nocomma_results


def charges_by_agent_stacked(agent_id):
    """
    Build the list of charges for one agent, period by period
    :param agent_id:
    :return:
    """

    all_charges = {}
    for (period_id, period_name) in db.session.execute("select id, name from period order by id"):
        charge_by_project_req = """select  p.name, c.charge_rate from project p left join
                                    charge c on p.id = c.project_id and agent_id = {} and period_id={}
                                        order by p.id""".format(agent_id, period_id)
        period_charge = {}
        for project_name, project_rate in db.session.execute(charge_by_project_req):
            period_charge[project_name] = project_rate

        all_charges[period_name] = period_charge

    return all_charges

def charges_by_agent(agent_id):

    periods = db.session.execute("select name from period")
    sql_txt = "select p.name, sum(charge_rate)  from charge inner join period p on charge.period_id = p.id\

                where agent_id={} group by period_id order by p.name" \
        .format(agent_id)

    request = db.session.execute(sql_txt)

    all_charges = []
    charges_list = [(period, charge) for (period, charge) in request.fetchall()]
    charges_dict = dict(charges_list)
    for (p,) in periods:
        if p in charges_dict.keys():
            all_charges.append([p, charges_dict[p]])
        else:
            all_charges.append([p, 0])

    return all_charges