from typing import Any

from ..core.database import (
    ChangeSet,
    DatabaseCommand,
    execute_command,
    g_update_prefix,
    read_all,
    sql_literal,
    try_read,
)


def get_emitter_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'junction'    : {'type': 'str'   , 'optional': False , 'readonly': True },
             'coefficient' : {'type': 'float' , 'optional': True ,  'readonly': False} }


def get_emitter(name: str, junction: str) -> dict[str, Any]:
    e = try_read(name, "select junction_id as junction, coefficient from network.emitters where junction_id = %s", (junction,))
    if e == None:
        return { 'junction': junction, 'coefficient': None }
    d = {}
    d['junction'] = str(e['junction'])
    d['coefficient'] = float(e['coefficient']) if e['coefficient'] != None else None
    return d


class Emitter(object):
    def __init__(self, input: dict[str, Any]) -> None:
        self.type = 'emitter'
        self.junction = str(input['junction'])
        self.coefficient = float(input['coefficient']) if 'coefficient' in input and input['coefficient'] != None else None

        self.f_type = sql_literal(self.type)
        self.f_junction = sql_literal(self.junction)
        self.f_coefficient = sql_literal(self.coefficient)

    def as_dict(self) -> dict[str, Any]:
        return { 'type': self.type, 'junction': self.junction, 'coefficient': self.coefficient }


def _set_emitter(name: str, cs: ChangeSet) -> DatabaseCommand:
    raw_new = get_emitter(name, cs.operations[0]['junction'])

    new_dict = cs.operations[0]
    schema = get_emitter_schema(name)
    for key, value in schema.items():
        if key in new_dict and not value['readonly']:
            raw_new[key] = new_dict[key]
    new = Emitter(raw_new)

    statement = f"delete from network.emitters where junction_id = {new.f_junction};"
    if new.coefficient != None:
        statement += f"\ninsert into network.emitters (junction_id, coefficient) values ({new.f_junction}, {new.f_coefficient});"

    change = g_update_prefix | new.as_dict()

    return DatabaseCommand(statement, [change])


def set_emitter(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_emitter(name, cs))


#--------------------------------------------------------------
# [EPA2][IN][OUT]
#   node   Ke
#--------------------------------------------------------------
# [EPA3][IN][OUT]
#   node   Ke  (exponent pattern)
#--------------------------------------------------------------


def inp_in_emitter(line: str) -> str:
    tokens = line.split()

    num = len(tokens)
    has_desc = tokens[-1].startswith(';')
    num_without_desc = (num - 1) if has_desc else num

    junction = str(tokens[0])
    coefficient = float(tokens[1])

    return str(f"insert into network.emitters (junction_id, coefficient) values ({sql_literal(junction)}, {sql_literal(coefficient)});")


def inp_out_emitter(name: str) -> list[str]:
    lines = []
    objs = read_all(name, 'select junction_id as junction, coefficient from network.emitters order by junction_id')
    for obj in objs:
        junction = obj['junction']
        coefficient = obj['coefficient']
        lines.append(f'{junction} {coefficient}')
    return lines


def delete_emitter_by_junction(name: str, junction: str) -> ChangeSet:
    row = try_read(name, "select 1 from network.emitters where junction_id = %s", (junction,))
    if row == None:
        return ChangeSet()
    return ChangeSet(g_update_prefix | {'type' : 'emitter', 'junction': junction, 'coefficient': None})