#!/usr/bin/python

# Copyright (c) 2019, John Westcott <john.westcott.iv@redhat.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

DOCUMENTATION = r"""
module: odbc
author: "John Westcott IV (@john-westcott-iv)"
version_added: "1.0.0"
short_description: Execute SQL using ODBC
description:
  - Read/Write info using ODBC drivers.
extends_documentation_fragment:
  - community.general.attributes
attributes:
  check_mode:
    support: none
  diff_mode:
    support: none
options:
  dsn:
    description:
      - The connection string passed into ODBC.
    required: true
    type: str
  query:
    description:
      - The SQL query to perform.
    required: true
    type: str
  params:
    description:
      - Parameters to pass to the SQL query.
    type: list
    elements: str
  commit:
    description:
      - Perform a commit after the execution of the SQL query.
      - Some databases allow a commit after a select whereas others raise an exception.
      - Default is V(true) to support legacy module behavior.
    type: bool
    default: true
    version_added: 1.3.0
requirements:
  - "pyodbc"

notes:
  - Like the command module, this module always returns V(changed=true) whether or not the query would change the database.
  - 'To alter this behavior you can use C(changed_when): [true or false].'
  - For details about return values (RV(description) and RV(row_count)) see U(https://github.com/mkleehammer/pyodbc/wiki/Cursor).
"""

EXAMPLES = r"""
- name: Set some values in the test db
  community.general.odbc:
    dsn: "DRIVER={ODBC Driver 13 for SQL Server};Server=db.ansible.com;Database=my_db;UID=admin;PWD=password;"
    query: "Select * from table_a where column1 = ?"
    params:
      - "value1"
    commit: false
  changed_when: false
"""

# @FIXME RV 'results' is meant to be used when 'loop:' was used with the module.
RETURN = r"""
results:
  description: List of lists of strings containing selected rows, likely empty for DDL statements.
  returned: success
  type: list
  elements: list
description:
  description: "List of dicts about the columns selected from the cursors, likely empty for DDL statements. See notes."
  returned: success
  type: list
  elements: dict
row_count:
  description: "The number of rows selected or modified according to the cursor defaults to V(-1). See notes."
  returned: success
  type: str
"""

from ansible.module_utils.basic import AnsibleModule, missing_required_lib

HAS_PYODBC = None
try:
    import pyodbc

    HAS_PYODBC = True
except ImportError:
    HAS_PYODBC = False


def main():
    module = AnsibleModule(
        argument_spec=dict(
            dsn=dict(type="str", required=True, no_log=True),
            query=dict(type="str", required=True),
            params=dict(type="list", elements="str"),
            commit=dict(type="bool", default=True),
        ),
    )

    dsn = module.params.get("dsn")
    query = module.params.get("query")
    params = module.params.get("params")
    commit = module.params.get("commit")

    if not HAS_PYODBC:
        module.fail_json(msg=missing_required_lib("pyodbc"))

    # Try to make a connection with the DSN
    connection = None
    try:
        connection = pyodbc.connect(dsn)
    except Exception as e:
        module.fail_json(msg=f"Failed to connect to DSN: {e}")

    result = dict(
        changed=True,
        description=[],
        row_count=-1,
        results=[],
    )

    try:
        cursor = connection.cursor()

        if params:
            cursor.execute(query, params)
        else:
            cursor.execute(query)
        if commit:
            cursor.commit()
        try:
            # Get the rows out into an 2d array
            for row in cursor.fetchall():
                new_row = [f"{column}" for column in row]
                result["results"].append(new_row)

            # Return additional information from the cursor
            for row_description in cursor.description:
                description = {}
                description["name"] = row_description[0]
                description["type"] = row_description[1].__name__
                description["display_size"] = row_description[2]
                description["internal_size"] = row_description[3]
                description["precision"] = row_description[4]
                description["scale"] = row_description[5]
                description["nullable"] = row_description[6]
                result["description"].append(description)

            result["row_count"] = cursor.rowcount
        except pyodbc.ProgrammingError:
            pass
        except Exception as e:
            module.fail_json(msg=f"Exception while reading rows: {e}")

        cursor.close()
    except Exception as e:
        module.fail_json(msg=f"Failed to execute query: {e}")
    finally:
        connection.close()

    module.exit_json(**result)


if __name__ == "__main__":
    main()