import json
import os
from itertools import count
from pathlib import Path

from cognos7.csv_column_types import get_column_types

col_type_convert = {
    "varchar(20)": "to_varchar20",
    "varchar(50)": "to_varchar50",
    "varchar(100)": "to_varchar100",
    "varchar(255)": "to_varchar255",
    "decimal(18,8)": "to_decimal",
    "int": "to_int",
    "datetime": "to_datetime",
    "date": "to_datetime",
}


def schema_convert(base_dir: str) -> None:
    base_dir = Path(base_dir).absolute()
    schema_file = base_dir / "schema.ini"
    with open(schema_file, "r", encoding="latin-1") as frh:
        schema = frh.read()
    # schema = schema.replace('\n\n', '\n').replace('\n\n', '\n')
    tables = dict([convert_table_info(t) for t in schema[1:].split("\n[")])

    tables_with_columns = {}

    for table, details in tables.items():
        table_file = base_dir / table
        if "schema.ini" in table or not table_file.exists():
            continue

        col_names = [c.split(" ")[0] for c in details["columns"].values()]
        tables_with_columns[table] = col_names

    create_format_xml_files(str(base_dir), tables_with_columns)


def convert_table_info(table_info: str) -> tuple[str, dict]:
    info = table_info.split("]\n")
    if len(info) < 2:
        return ("", "")
    details = {}
    details["columns"] = {}
    for key, value in [row.split("=") for row in info[1].split("\n") if "=" in row]:
        if key.lower() != "colnameheader" and key.lower()[:3] == "col":
            details["columns"][key[3:]] = value
    return (info[0], details)


def create_format_xml_files(base_dir: str, tables_with_columns: dict[str, list[str]]) -> None:
    for table, columns in tables_with_columns.items():
        table_file = table
        if table[:-4] != ".csv":
            table_file = f"{table}.csv"
        format_file = f"{base_dir}\\{table_file}.xml"

        record = []
        row = []

        for i, col_name in enumerate(columns, 1):
            record.append(
                f'    <FIELD ID="{i}" xsi:type="CharTerm" TERMINATOR=";" MAX_LENGTH="255" COLLATION="SQL_Latin1_General_CP1_CI_AS"/>'
            )
            col_name_escape = (
                col_name.replace("&", "&#38;")
                .encode("ascii", "xmlcharrefreplace")
                .decode()
                .replace("<", "&#60;")
                .replace(">", "&#62;")
            )
            row.append(f'    <COLUMN SOURCE="{i}" NAME="{col_name_escape}" xsi:type="SQLVARYCHAR"/>')
        record[-1] = record[-1].replace(";", "\\r\\n")

        with open(format_file, "w") as fwh:
            fwh.write(
                '<?xml version="1.0"?>\n<BCPFORMAT xmlns="http://schemas.microsoft.com/sqlserver/2004/bulkload/format" '
            )
            fwh.write('xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">\n  <RECORD>\n')
            fwh.write("\n".join(record))
            fwh.write("\n  </RECORD>\n  <ROW>\n")
            fwh.write("\n".join(row))
            fwh.write("\n  </ROW>\n</BCPFORMAT>")


def create_format_xml_from_folder(base_dir: str) -> None:
    system = Path(base_dir).parent.name
    format_folder = f"{base_dir}\\Format"
    os.makedirs(format_folder, exist_ok=True)
    sql_folder = f"{base_dir}\\SQL"
    os.makedirs(f"{sql_folder}\\views_export", exist_ok=True)
    os.makedirs(f"{sql_folder}\\views_load", exist_ok=True)
    os.makedirs(f"{sql_folder}\\exec_drop_create", exist_ok=True)
    os.makedirs(f"{sql_folder}\\exec_update", exist_ok=True)
    tables_with_columns = get_tables_with_columns_from_folder(base_dir)
    with open(f"{format_folder}\\tables.json", "w") as fwh:
        json.dump(tables_with_columns, fwh, indent=2)
    create_format_xml_files(format_folder, tables_with_columns)
    create_openrowset_sql_files(base_dir, format_folder, sql_folder, tables_with_columns)
    create_load_sql_files(sql_folder, tables_with_columns)
    create_drop_create_sql_files(sql_folder, tables_with_columns, system)
    create_update_sql_files(sql_folder, tables_with_columns, system)
    create_sql_bat_files(sql_folder)


def create_openrowset_sql_files(
    base_dir: str, format_folder: str, sql_folder: str, tables_with_columns: dict[str, list[str]]
) -> None:
    for table, columns in tables_with_columns.items():
        csv_file = f"{base_dir}\\{table}.csv"
        format_file = f"{format_folder}\\{table}.csv.xml"
        sql_file = f"{sql_folder}\\views_export\\export_csv.{table}.sql"

        col_types = get_column_types(csv_file, columns)
        select_fields = [get_select_statement(col, col_type) for col, col_type in col_types.items()]
        query = (
            "SELECT "
            + ",\n\t".join(select_fields)
            + "\nFROM OPENROWSET(\n"
            + f"\tBULK '{csv_file}',\n"
            + f"\tFORMATFILE = '{format_file}',\n"
            + "\tFIRSTROW = 2\n"
            + ") AS T1"
        )

        create_view = get_create_view("export_csv", table, query)
        with open(sql_file, "w", encoding="latin-1") as fwh:
            fwh.write(create_view)


def get_create_view(schema: str, table: str, query: str) -> str:
    create_view = (
        "SET QUOTED_IDENTIFIER ON\nGO\n\nSET ANSI_NULLS ON\nGO\n\n"
        + f"CREATE\n\tOR\n\nALTER VIEW [{schema}].[{table}]\nAS\n{query}\n"
        + "GO\n\nSET QUOTED_IDENTIFIER OFF\nGO\n\nSET ANSI_NULLS OFF\nGO\n\n\nGO\n\n\n"
    )
    return create_view


def get_select_statement(col: str, col_type: str) -> str:
    convert = col_type_convert.get(col_type)
    if convert:
        return f"dbo.{convert}(T1.[{col}]) AS [{col}]"
    return f"T1.[{col}]"


def create_load_sql_files(sql_folder: str, tables_with_columns: dict[str, list[str]]):
    for table, columns in tables_with_columns.items():
        sql_file = f"{sql_folder}\\views_load\\load.{table}.sql"
        cols = [f"[{c}]" for c in columns]
        query = "SELECT " + ",\n\t".join(cols) + f"\nFROM [export_csv].[{table}]"
        create_view = get_create_view("load", table, query)
        with open(sql_file, "w", encoding="latin-1") as fwh:
            fwh.write(create_view)


def create_drop_create_sql_files(sql_folder: str, tables_with_columns: dict[str, list[str]], system: str = "OPTIMA"):
    for table in tables_with_columns.keys():
        sql_file = f"{sql_folder}\\exec_drop_create\\{table}.sql"
        query = (
            f"USE [GC]\nGO\n\nDROP TABLE IF EXISTS [{system.lower()}].[{table}]\nGO\n\n"
            + f"SELECT *\nINTO [{system.lower()}].[{table}]\nFROM [{system}].[load].[{table}]"
        )
        with open(sql_file, "w", encoding="latin-1") as fwh:
            fwh.write(query)


def create_update_sql_files(sql_folder: str, tables_with_columns: dict[str, list[str]], system: str = "OPTIMA"):
    for table in tables_with_columns.keys():
        sql_file = f"{sql_folder}\\exec_update\\{table}.sql"
        query = (
            f"USE [GC]\nGO\n\nTRUNCATE TABLE [{system.lower()}].[{table}]\nGO\n\n"
            + f"INSERT INTO [{system.lower()}].[{table}]\n"
            + f"SELECT *\nFROM [{system}].[load].[{table}]"
        )
        with open(sql_file, "w", encoding="latin-1") as fwh:
            fwh.write(query)


def get_tables_with_columns_from_folder(base_dir: str) -> dict[str, list[str]]:
    tables_with_columns = {}

    for csv_file in Path(base_dir).glob("*.csv"):
        table_name = csv_file.stem
        with open(csv_file, "r", encoding="latin-1") as frh:
            cols = frh.readline().strip("\n").split(";")
        cols_unique = []
        cols_unique_lower = []
        for c in cols:
            c1 = c.strip('"')
            if c1.lower() not in cols_unique_lower:
                cols_unique.append(c1)
                cols_unique_lower.append(c1.lower())
                continue
            for i in count(1):
                c2 = f"{c1}_{i}"
                if c2 not in cols and c2.lower() not in cols_unique_lower:
                    cols_unique.append(c2)
                    cols_unique_lower.append(c2.lower())
                    break
        tables_with_columns[table_name] = cols_unique
    return tables_with_columns


def create_sql_bat_files(sql_folder: str) -> None:
    tasks_dir = Path(sql_folder).parent.parent.parent.parent / "Tasks" / "scripts"
    header = f'@call "{tasks_dir}\\config.bat" 0 > nul'

    folder_list = [
        "views_export",
        "views_load",
        "exec_drop_create",
        "exec_update",
    ]
    for f in folder_list:
        folder = f"{sql_folder}\\{f}"
        bat_file = f"{folder}\\{f}.bat"

        with open(bat_file, "w", encoding="cp850") as fwh:
            fwh.write(header + "\n\n")
            fwh.write(f"echo {folder}\n")

            for sql_file in Path(folder).glob("*.sql"):
                fwh.write(f"  call sqlexec2.bat {sql_file}\n")


if __name__ == "__main__":
    # schema_convert("C:\\GlobalCube_LOCOSOFT\\GCStruct_SKR51\\Kontenrahmen")
    create_format_xml_from_folder("C:\\GlobalCube_LOCOSOFT\\System\\LOCOSOFT\\Export")