from .database import *


LINK_STATUS_OPEN = 'OPEN'
LINK_STATUS_CLOSED = 'CLOSED'
LINK_STATUS_ACTIVE = 'ACTIVE'


def get_status_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'link'    : {'type': 'str'   , 'optional': False , 'readonly': True },
             'status'  : {'type': 'str'   , 'optional': True  , 'readonly': False},
             'setting' : {'type': 'float' , 'optional': True  , 'readonly': False} }


def get_status(name: str, link: str) -> dict[str, Any]:
    s = try_read(name, f"select * from status where link = '{link}'")
    if s == None:
        return { 'link': link, 'status': None, 'setting': None }
    d = {}
    d['link'] = str(s['link'])
    d['status'] = str(s['status']) if s['status'] != None else None
    d['setting'] = float(s['setting']) if s['setting'] != None else None
    return d


class Status(object):
    def __init__(self, input: dict[str, Any]) -> None:
        self.type = 'status'
        self.link = str(input['link'])
        self.status = str(input['status']) if 'status' in input and input['status'] != None else None
        self.setting = float(input['setting']) if 'setting' in input and input['setting'] != None else None

        self.f_type = f"'{self.type}'"
        self.f_link = f"'{self.link}'"
        self.f_status = f"'{self.status}'" if self.status != None else 'null'
        self.f_setting = self.setting if self.setting != None else 'null'

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


def _set_status(name: str, cs: ChangeSet) -> DbChangeSet:
    old = Status(get_status(name, cs.operations[0]['link']))
    raw_new = get_status(name, cs.operations[0]['link'])

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

    redo_sql = f"delete from status where link = {new.f_link};"
    if new.status != None or new.setting != None:
        redo_sql += f"\ninsert into status (link, status, setting) values ({new.f_link}, {new.f_status}, {new.f_setting});"

    undo_sql = f"delete from status where link = {old.f_link};"
    if old.status != None or old.setting != None:
        undo_sql += f"\ninsert into status (link, status, setting) values ({old.f_link}, {old.f_status}, {old.f_setting});"

    redo_cs = g_update_prefix | new.as_dict()
    undo_cs = g_update_prefix | old.as_dict()

    return DbChangeSet(redo_sql, undo_sql, [redo_cs], [undo_cs])


def set_status(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_status(name, cs))


#--------------------------------------------------------------
# [EPA2][EPA3][IN][OUT]
#    link   value
#--------------------------------------------------------------


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

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

    link = str(tokens[0])
    value = tokens[1].upper()
    if value == LINK_STATUS_OPEN or value == LINK_STATUS_CLOSED or value == LINK_STATUS_ACTIVE:
        return str(f"insert into status (link, status, setting) values ('{link}', '{value}', null);")
    else:
        return str(f"insert into status (link, status, setting) values ('{link}', null, {float(value)});")


def inp_out_status(name: str) -> list[str]:
    lines = []
    objs = read_all(name, 'select * from status')
    for obj in objs:
        link = obj['link']
        status = obj['status'] if obj['status'] != None else ''
        setting = obj['setting'] if obj['setting'] != None else ''
        if status != '':
            lines.append(f'{link} {status}')
        if setting != '':
            lines.append(f'{link} {setting}')
    return lines


def delete_status_by_link(name: str, link: str) -> ChangeSet:
    row = try_read(name, f"select * from status where link = '{link}'")
    if row == None:
        return ChangeSet()
    return ChangeSet(g_update_prefix | {'type': 'status', 'link': link, 'status': None, 'setting': None})