from typing import Any

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


element_schema = {'type': 'str' , 'optional': True , 'readonly': False}


def get_energy_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'GLOBAL PRICE'   : element_schema,
             'GLOBAL PATTERN' : element_schema,
             'GLOBAL EFFIC'   : element_schema,
             'DEMAND CHARGE'  : element_schema }


def get_energy(name: str) -> dict[str, Any]:
    ts = read_all(name, "select key, value from network.energy_settings")
    d = {}
    for e in ts:
        d[e['key']] = str(e['value'])
    return d


def _set_energy(name: str, cs: ChangeSet) -> DatabaseCommand:
    new = {}

    new_dict = cs.operations[0]
    schema = get_energy_schema(name)
    for key in schema.keys():
        if key in new_dict:
            new[key] = str(new_dict[key])

    change = g_update_prefix | { 'type' : 'energy' }

    statement = ''
    for key, value in new.items():
        if statement != '':
            statement += '\n'
        statement += f"update network.energy_settings set value = {sql_literal(value)} where key = {sql_literal(key)};"
        change |= { key: value }

    return DatabaseCommand(statement, [change])


def set_energy(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_energy(name, cs))


def get_pump_energy_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'pump'    : {'type': 'str'   , 'optional': False , 'readonly': True },
             'price'   : {'type': 'float' , 'optional': True  , 'readonly': False},
             'pattern' : {'type': 'str'   , 'optional': True  , 'readonly': False},
             'effic'   : {'type': 'str'   , 'optional': True  , 'readonly': False} }


def get_pump_energy(name: str, pump: str) -> dict[str, Any]:
    d = {}
    d['pump'] = pump
    pe = try_read(name, "select price, pattern_id as pattern, efficiency_curve_id as effic from network.pump_energy_settings where pump_id = %s", (pump,))
    d['price'] = float(pe['price']) if pe is not None and pe['price'] is not None else None
    d['pattern'] = str(pe['pattern']) if pe is not None and pe['pattern'] is not None else None
    d['effic'] = str(pe['effic']) if pe is not None and pe['effic'] is not None else None
    return d


class PumpEnergy(object):
    def __init__(self, input: dict[str, Any]) -> None:
        self.type = 'pump_energy'
        self.pump = str(input['pump'])
        self.price = float(input['price']) if 'price' in input and input['price'] != None else None
        self.pattern = str(input['pattern']) if 'pattern' in input and input['pattern'] != None else None
        self.effic = str(input['effic']) if 'effic' in input and input['effic'] != None else None

        self.f_type = sql_literal(self.type)
        self.f_pump = sql_literal(self.pump)
        self.f_price = sql_literal(self.price)
        self.f_pattern = sql_literal(self.pattern)
        self.f_effic = sql_literal(self.effic)

    def as_dict(self) -> dict[str, Any]:
        return { 'type': self.type, 'pump': self.pump, 'price': self.price, 'pattern': self.pattern, 'effic': self.effic }


def _set_pump_energy(name: str, cs: ChangeSet) -> DatabaseCommand:
    raw_new = get_pump_energy(name, cs.operations[0]['pump'])

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

    statement = f"delete from network.pump_energy_settings where pump_id = {new.f_pump};"
    if new.price is not None or new.pattern is not None or new.effic is not None:
        statement += f"\ninsert into network.pump_energy_settings (pump_id, efficiency_curve_id, pattern_id, price) values ({new.f_pump}, {new.f_effic}, {new.f_pattern}, {new.f_price});"

    change = g_update_prefix | new.as_dict()

    return DatabaseCommand(statement, [change])


def set_pump_energy(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_pump_energy(name, cs))


#--------------------------------------------------------------
# [EPA2][EPA3][IN][OUT]
#   GLOBAL         {PRICE/PATTERN/EFFIC}  value
#   PUMP   id      {PRICE/PATTERN/EFFIC}  value
#   DEMAND CHARGE  value
#--------------------------------------------------------------


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

    if tokens[0].upper() == 'PUMP':
        pump = tokens[1]
        key = tokens[2].lower()
        value = tokens[3]
        if key == 'price':
            value = float(value)
        if key == 'efficiency':
            key = 'effic'

        column = {'price': 'price', 'pattern': 'pattern_id', 'effic': 'efficiency_curve_id'}[key]
        return str(f"insert into network.pump_energy_settings (pump_id, {column}) values ({sql_literal(pump)}, {sql_literal(value)}) on conflict (pump_id) do update set {column} = excluded.{column};")

    else:
        line = line.upper().strip()
        for key in get_energy_schema('').keys():
            if line.startswith(key):
                value = line.removeprefix(key).strip()

                # exception here
                if line.startswith('GLOBAL EFFICIENCY'):
                    value = line.removeprefix('GLOBAL EFFICIENCY').strip()

                return str(f"update network.energy_settings set value = {sql_literal(value)} where key = {sql_literal(key)};")

    return str('')


def inp_out_energy(name: str) -> list[str]:
    lines = []

    objs = read_all(name, "select key, value from network.energy_settings order by key")
    for obj in objs:
        key = obj['key']
        value = obj['value']
        if value.strip() != '':
            lines.append(f'{key} {value}')

    objs = read_all(name, "select pump_id as pump, price, pattern_id as pattern, efficiency_curve_id as effic from network.pump_energy_settings order by pump_id")
    for obj in objs:
        pump = obj['pump']
        if obj['price'] is not None:
            lines.append(f"PUMP {pump} PRICE {obj['price']}")
        if obj['pattern'] is not None:
            lines.append(f"PUMP {pump} PATTERN {obj['pattern']}")
        if obj['effic'] is not None:
            lines.append(f"PUMP {pump} EFFIC {obj['effic']}")

    return lines


def delete_pump_energy_by_pump(name: str, pump: str) -> ChangeSet:
    row = try_read(
        name,
        "select pump_id from network.pump_energy_settings where pump_id = %s",
        (pump,),
    )
    if row is None:
        return ChangeSet()
    return ChangeSet(g_update_prefix | {'type': 'pump_energy', 'pump' : pump, 'price': None, 'pattern': None, 'effic': None})


def unset_pump_energy_by_pattern(name: str, pattern: str) -> ChangeSet:
    cs = ChangeSet()

    rows = read_all(
        name,
        "select pump_id as pump, price, efficiency_curve_id as effic "
        "from network.pump_energy_settings where pattern_id = %s",
        (pattern,),
    )
    for row in rows:
        pump = row['pump']
        price = float(row['price']) if row['price'] is not None else None
        effic = str(row['effic']) if row['effic'] is not None else None
        cs.append(g_update_prefix | {'type': 'pump_energy', 'pump' : pump, 'price': price, 'pattern': None, 'effic': effic})

    return cs


def unset_pump_energy_by_curve(name: str, curve: str) -> ChangeSet:
    cs = ChangeSet()

    rows = read_all(
        name,
        "select pump_id as pump, price, pattern_id as pattern "
        "from network.pump_energy_settings where efficiency_curve_id = %s",
        (curve,),
    )
    for row in rows:
        pump = row['pump']
        price = float(row['price']) if row['price'] is not None else None
        pattern = str(row['pattern']) if row['pattern'] is not None else None
        cs.append(g_update_prefix | {'type': 'pump_energy', 'pump' : pump, 'price': price, 'pattern': pattern, 'effic': None})

    return cs