from .database import *

TIME_STATISTIC_NONE = 'NONE'
TIME_STATISTIC_AVERAGED = 'AVERAGED'
TIME_STATISTIC_MINIMUM = 'MINIMUM'
TIME_STATISTIC_MAXIMUM = 'MAXIMUM'
TIME_STATISTIC_RANGE = 'RANGE'

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

def get_time_schema(name: str) -> dict[str, dict[str, Any]]:
    return { 'DURATION'           : element_schema,
             'HYDRAULIC TIMESTEP' : element_schema,
             'QUALITY TIMESTEP'   : element_schema,
             'RULE TIMESTEP'      : element_schema,
             'PATTERN TIMESTEP'   : element_schema,
             'PATTERN START'      : element_schema,
             'REPORT TIMESTEP'    : element_schema,
             'REPORT START'       : element_schema,
             'START CLOCKTIME'    : element_schema,
             'STATISTIC'          : element_schema}


def get_time(name: str) -> dict[str, Any]:
    ts = read_all(name, f"select * from times")
    d = {}
    for e in ts:
        d[e['key']] = str(e['value'])
    return d


def _set_time(name: str, cs: ChangeSet) -> DbChangeSet:
    raw_old = get_time(name)

    old = {}
    new = {}

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

    redo_cs = g_update_prefix | { 'type' : 'time' }

    redo_sql = ''
    for key, value in new.items():
        if redo_sql != '':
            redo_sql += '\n'
        redo_sql += f"update times set value = '{value}' where key = '{key}';"
        redo_cs |= { key: value }

    undo_cs = g_update_prefix | { 'type' : 'time' }

    undo_sql = ''
    for key, value in old.items():
        if undo_sql != '':
            undo_sql += '\n'
        undo_sql += f"update times set value = '{value}' where key = '{key}';"
        undo_cs |= { key: value }

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


def set_time(name: str, cs: ChangeSet) -> ChangeSet:
    return execute_command(name, _set_time(name, cs))


#--------------------------------------------------------------
# [EPA2][EPA3]
#   STATISTIC                  {NONE/AVERAGE/MIN/MAX/RANGE}
#   DURATION                   value   (units)
#   HYDRAULIC TIMESTEP         value   (units)
#   QUALITY TIMESTEP           value   (units)
#   RULE TIMESTEP              value   (units)
#   PATTERN TIMESTEP           value   (units)
#   PATTERN START              value   (units)
#   REPORT TIMESTEP            value   (units)
#   REPORT START               value   (units)
#   START CLOCKTIME            value   (AM PM)
# [EPA3] supports [EPA2] keyword
#--------------------------------------------------------------


def inp_in_time(section: list[str]) -> str:
    sql = ''
    for s in section:
        if s.startswith(';'):
            continue
        
        line = s.upper().strip()
        for key in get_time_schema('').keys():
            if line.startswith(key):
                value = line.removeprefix(key).strip()
                sql += f"update times set value = '{value}' where key = '{key}';"
    return sql


def inp_out_time(name: str) -> list[str]:
    lines = []
    objs = read_all(name, f"select * from times")
    for obj in objs:
        key = obj['key']
        value = obj['value']
        lines.append(f'{key} {value}')
    return lines