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_reaction_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'ORDER BULK'            : element_schema,
             'ORDER WALL'            : element_schema,
             'ORDER TANK'            : element_schema,
             'GLOBAL BULK'           : element_schema,
             'GLOBAL WALL'           : element_schema,
             'LIMITING POTENTIAL'    : element_schema,
             'ROUGHNESS CORRELATION' : element_schema }


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


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

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

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

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

    return DatabaseCommand(statement, [change])


def set_reaction(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_reaction(name, cs))


def get_pipe_reaction_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'pipe' : {'type': 'str'   , 'optional': False , 'readonly': True },
             'bulk' : {'type': 'float' , 'optional': True  , 'readonly': False},
             'wall' : {'type': 'float' , 'optional': True  , 'readonly': False} }


def get_pipe_reaction(name: str, pipe: str) -> dict[str, Any]:
    d = {}
    d['pipe'] = pipe
    pr = try_read(name, "select bulk_coefficient as bulk, wall_coefficient as wall from network.pipe_reaction_coefficients where pipe_id = %s", (pipe,))
    d['bulk'] = float(pr['bulk']) if pr is not None and pr['bulk'] is not None else None
    d['wall'] = float(pr['wall']) if pr is not None and pr['wall'] is not None else None
    return d


class PipeReaction(object):
    def __init__(self, input: dict[str, Any]) -> None:
        self.type = 'pipe_reaction'
        self.pipe = str(input['pipe'])
        self.bulk = float(input['bulk']) if 'bulk' in input and input['bulk'] != None else None
        self.wall = float(input['wall']) if 'wall' in input and input['wall'] != None else None

        self.f_type = sql_literal(self.type)
        self.f_pipe = sql_literal(self.pipe)
        self.f_bulk = sql_literal(self.bulk)
        self.f_wall = sql_literal(self.wall)

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


def _set_pipe_reaction(name: str, cs: ChangeSet) -> DatabaseCommand:
    raw_new = get_pipe_reaction(name, cs.operations[0]['pipe'])

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

    statement = f"delete from network.pipe_reaction_coefficients where pipe_id = {new.f_pipe};"
    if new.bulk is not None or new.wall is not None:
        statement += f"\ninsert into network.pipe_reaction_coefficients (pipe_id, bulk_coefficient, wall_coefficient) values ({new.f_pipe}, {new.f_bulk}, {new.f_wall});"

    change = g_update_prefix | new.as_dict()

    return DatabaseCommand(statement, [change])


def set_pipe_reaction(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_pipe_reaction(name, cs))


def get_tank_reaction_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'tank'  : {'type': 'str'   , 'optional': False , 'readonly': True },
             'value' : {'type': 'float' , 'optional': True  , 'readonly': False} }


def get_tank_reaction(name: str, tank: str) -> dict[str, Any]:
    d = {}
    d['tank'] = tank
    pr = try_read(name, "select coefficient as value from network.tank_reaction_coefficients where tank_id = %s", (tank,))
    d['value'] = float(pr['value']) if pr is not None else None
    return d


class TankReaction(object):
    def __init__(self, input: dict[str, Any]) -> None:
        self.type = 'tank_reaction'
        self.tank = str(input['tank'])
        self.value = float(input['value']) if 'value' in input and input['value'] != None else None

        self.f_type = sql_literal(self.type)
        self.f_tank = sql_literal(self.tank)
        self.f_value = sql_literal(self.value)

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


def _set_tank_reaction(name: str, cs: ChangeSet) -> DatabaseCommand:
    raw_new = get_tank_reaction(name, cs.operations[0]['tank'])

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

    statement = f"delete from network.tank_reaction_coefficients where tank_id = {new.f_tank};"
    if new.value != None:
        statement += f"\ninsert into network.tank_reaction_coefficients (tank_id, coefficient) values ({new.f_tank}, {new.f_value});"

    change = g_update_prefix | new.as_dict()

    return DatabaseCommand(statement, [change])


def set_tank_reaction(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_tank_reaction(name, cs))


#--------------------------------------------------------------
# [EPA2][EPA3][IN][OUT]
#   ORDER     {BULK/WALL/TANK} value
#   GLOBAL    BULK             coeff
#   GLOBAL    WALL             coeff
#   BULK      link1  (link2)   coeff
#   WALL      link1  (link2)   coeff
#   TANK      node1  (node2)   coeff
#   LIMITING  POTENTIAL        value
#   ROUGHNESS CORRELATION      value
#--------------------------------------------------------------


def inp_in_reaction(line: str) -> str:
    tokens = line.split()
    token0 = tokens[0].upper()
    if token0 == 'BULK' or token0 == 'WALL':
        pipe = tokens[1]
        key = token0.lower()
        value = float(tokens[2])
        column = 'bulk_coefficient' if key == 'bulk' else 'wall_coefficient'
        return str(f"insert into network.pipe_reaction_coefficients (pipe_id, {column}) values ({sql_literal(pipe)}, {sql_literal(value)}) on conflict (pipe_id) do update set {column} = excluded.{column};")

    elif token0 == 'TANK':
        tank = tokens[1]
        value = float(tokens[2])
        return str(f"insert into network.tank_reaction_coefficients (tank_id, coefficient) values ({sql_literal(tank)}, {sql_literal(value)});")

    else:
        line = line.upper().strip()
        for key in get_reaction_schema('').keys():
            if line.startswith(key):
                value = line.removeprefix(key).strip()
                return str(f"update network.reaction_settings set value = {sql_literal(value)} where key = {sql_literal(key)};")

    return str('')


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

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

    objs = read_all(name, "select pipe_id as pipe, bulk_coefficient as value from network.pipe_reaction_coefficients where bulk_coefficient is not null order by pipe_id")
    for obj in objs:
        pipe = obj['pipe']
        value = obj['value']
        lines.append(f'BULK {pipe} {value}')

    objs = read_all(name, "select pipe_id as pipe, wall_coefficient as value from network.pipe_reaction_coefficients where wall_coefficient is not null order by pipe_id")
    for obj in objs:
        pipe = obj['pipe']
        value = obj['value']
        lines.append(f'WALL {pipe} {value}')

    objs = read_all(name, "select tank_id as tank, coefficient as value from network.tank_reaction_coefficients order by tank_id")
    for obj in objs:
        tank = obj['tank']
        value = obj['value']
        lines.append(f'TANK {tank} {value}')

    return lines


def delete_pipe_reaction_by_pipe(name: str, pipe: str) -> ChangeSet:
    row = try_read(name, "select 1 from network.pipe_reaction_coefficients where pipe_id = %s", (pipe,))
    if row is None:
        return ChangeSet()
    return ChangeSet(g_update_prefix | {'type': 'pipe_reaction', 'pipe': pipe, 'bulk': None, 'wall': None})


def delete_tank_reaction_by_tank(name: str, tank: str) -> ChangeSet:
    row = try_read(name, "select 1 from network.tank_reaction_coefficients where tank_id = %s", (tank,))
    if row == None:
        return ChangeSet()
    return ChangeSet(g_update_prefix | {'type': 'tank_reaction', 'tank': tank, 'value': None})