import datetime

import pandas as pd
import pytest
from flask import current_app

from app.base.mode import ModeGroups
from app.base.utils import is_allowed_extensions, order_by_column_name, paginate_models
from app.coordinator.exceptions import InvalidNameOrTypeHeaderException
from app.coordinator.utils import (
    check_columns,
    generate_csv,
    generate_range_dates,
    get_duration_time,
    map_project_supervisors,
    parse_csv,
)
from app.dependencies import db
from app.students.models import Group, Student


def test_is_allowed_extensions(test_app) -> None:
    with test_app.app_context():
        for ext in current_app.config.get("ALLOWED_EXTENSIONS"):
            assert is_allowed_extensions(f"file.{ext}") is True


def test_is_allowed_extensions_with_invalid_extensions(test_app) -> None:
    with test_app.app_context():
        assert is_allowed_extensions("file.invalid_ext") is False
        assert is_allowed_extensions("file") is False


def test_order_by_column_name_ascending_mode(test_app) -> None:
    with test_app.app_context():
        query = order_by_column_name(Student.query, "index", "desc")
        assert 'ORDER BY students."index"' in str(query)


def test_order_by_column_name_descending_mode(test_app) -> None:
    with test_app.app_context():
        query = order_by_column_name(Student.query, "index", "desc")
        assert 'ORDER BY students."index" DESC' in str(query)


def test_paginate_models(test_app_ctx_with_db) -> None:
    with test_app_ctx_with_db:
        st = Student(
            index=123456,
            first_name="Dominic",
            last_name="Smith",
            email="xxx@gmail.com",
        )
        st1 = Student(
            index=123457,
            first_name="John",
            last_name="Newton",
            email="zzz@gmail.com",
        )
        db.session.add_all([st, st1])
        db.session.commit()
        result = paginate_models(1, Student.query, 1)

        items = result.get("items", [])
        max_pages = result.get("max_pages", 0)

        assert len(items) == 1
        assert max_pages == 2


def test_check_columns() -> None:
    dummy_data = {
        "NAZWISKO": ["Smith"],
        "IMIE": ["Dominic"],
        "INDEKS": [343433],
        "EMAIL": ["domsmi@gmail.com"],
    }
    df = pd.DataFrame(data=dummy_data)
    assert check_columns(df) is True


def test_check_columns_with_invalid_column_names() -> None:
    dummy_data = {"col1": [1, 2], "col2": [2, 3]}
    df = pd.DataFrame(data=dummy_data)
    assert check_columns(df) is False


def test_check_columns_with_invalid_column_types() -> None:
    dummy_data = {
        "NAZWISKO": [999],
        "IMIE": ["Dominic"],
        "INDEKS": [343433],
        "EMAIL": ["domsmi@gmail.com"],
    }
    df = pd.DataFrame(data=dummy_data)
    assert check_columns(df) is False


def get_path_to_fake_data(filename: str) -> str:
    base_dir = current_app.config.get("BASE_DIR", "/")
    return base_dir / "tests" / "data" / filename


def test_parse_csv(test_app) -> None:
    with test_app.app_context():
        with open(get_path_to_fake_data("students.csv")) as f:
            students = sorted(list(parse_csv(f, 1)), key=lambda s: s.index)
            indexes = [452790 + i for i in range(3)]
            assert len(students) == len(indexes)
            for st, idx in zip(students, indexes):
                assert st.index == idx


def test_parse_csv_with_invalid_column_header_name_in_csv_file(test_app) -> None:
    with test_app.app_context():
        with open(get_path_to_fake_data("students_column_name.csv")) as f:
            with pytest.raises(InvalidNameOrTypeHeaderException):
                parse_csv(f, 1)


def test_parse_csv_with_invalid_column_type_in_csv_file(test_app) -> None:
    with test_app.app_context():
        with open(get_path_to_fake_data("students_column_type.csv")) as f:
            with pytest.raises(InvalidNameOrTypeHeaderException):
                parse_csv(f, 1)


def test_generate_range_dates() -> None:
    start_date = datetime.datetime(2022, 2, 2, 8, 0, 0, 0)
    end_date = datetime.datetime(2022, 2, 2, 12, 0, 0, 0)
    step = 30
    expected_dates_amount = (end_date - start_date).total_seconds() / 60.0 / step
    dates = list(generate_range_dates(start_date, end_date, step))

    assert expected_dates_amount == len(dates)

    for date in dates:
        assert start_date <= date < end_date


def test_generate_csv() -> None:
    students_data = [
        {
            "first_name": "Dominic",
            "last_name": "Smith",
            "email": "xxe@gmail.com",
            "index": 123456,
        },
        {
            "first_name": "Matthew",
            "last_name": "Cash",
            "email": "zze@gmail.com",
            "index": 123455,
        },
        {
            "first_name": "Martin",
            "last_name": "Rose",
            "email": "nne@gmail.com",
            "index": 123446,
        },
    ]

    students = [Student(**data) for data in students_data]
    gr1 = Group(name="new-project")
    gr2 = Group(name="system-pri")
    gr1.students.append(students[0])
    gr1.students.append(students[1])
    gr2.students.append(students[2])

    students_and_groups = [
        (students[0], gr1),
        (students[1], gr1),
        (students[2], gr2),
    ]
    generated_csv = generate_csv(students_and_groups)
    for data in students_data:
        for value in data.values():
            assert str(value) in generated_csv


def test_map_project_supervisors() -> None:
    project_supervisors_id = [(1, 2), (2, 3), (3, 7)]
    groups = []
    for i in range(3):
        for _, ps_id in project_supervisors_id:
            groups.append(Group(project_supervisor_id=ps_id))

    mapped_ps = map_project_supervisors(
        sorted(groups, key=lambda g: g.project_supervisor_id)
    )
    for expected_id, ps_id in project_supervisors_id:
        assert mapped_ps[ps_id] == expected_id


def test_get_duration_time() -> None:
    assert get_duration_time(ModeGroups.STATIONARY.value) == 30
    assert get_duration_time(ModeGroups.NON_STATIONARY.value) == 20
    assert get_duration_time(ModeGroups.ENGLISH_SPEAKING_STATIONARY.value) == 30
    assert get_duration_time("invalid value") is None