import pytest

from backend.model.student import Student
from backend.model.tribe import Tribe
from backend.repository.abstract_repository import AbstractRepository
from backend.repository.student_sqlite_repository import StudentRepositoryError
from backend.repository.tribe_sqlite_repository import TribeRepositoryError
from backend.service import services
from backend.service.services import (
    StudentDoesExist,
    StudentExists,
    TribeDoesNotExist,
    TribeExists,
)
from tests.model.fakes import build_student, build_tribes


class FakeTribeRepository(AbstractRepository):
    def __init__(self, tribes: list[Tribe] = []) -> None:
        self._tribes = {t.name: t for t in tribes}

    def add(self, tribe: Tribe) -> None:
        if tribe.name not in self._tribes.keys():
            self._tribes[tribe.name] = tribe
        else:
            raise TribeRepositoryError(f"{tribe} already exists")

    def update(self, name: str, tribe: Tribe) -> None:
        try:
            self._tribes.pop(name)
            self._tribes[tribe.name] = tribe
        except KeyError:
            raise TribeRepositoryError(f"The tribe {tribe} does not exists")

    def list(self) -> list[Tribe]:
        return list(self._tribes.values())

    def get(self, name: str) -> Tribe:
        try:
            return self._tribes[name]
        except KeyError:
            raise TribeRepositoryError(f"The tribe {name} does not exists")

    def delete(self, name: str) -> None:
        try:
            self._tribes.pop(name)
        except KeyError:
            raise TribeRepositoryError(f"The tribe {name} does not exists")


class FakeStudentRepository(AbstractRepository):
    def __init__(self, students: list[Student] = []) -> None:
        self._students = {s.id: s for s in students}

    def add(self, student: Student) -> None:
        if student.id not in self._students.keys():
            self._students[student.id] = student
        else:
            raise StudentRepositoryError(f"{student} already exists")

    def update(self, student: Student) -> None:
        if student.id not in self._students.keys():
            raise StudentRepositoryError(f"The student {student} does not exists")

        self._students[student.id] = student

    def list(self) -> list[Student]:
        return list(self._students.values())

    def get(self, id: str) -> Student:
        try:
            return self._students[id]
        except KeyError:
            raise KeyError(f"The student ({id=}) does not exists")

    def delete(self, id: str) -> None:
        try:
            self._students.pop(id)
        except KeyError:
            raise StudentRepositoryError(f"The student {student} does not exists")


class FakeConn:
    committed = False

    def commit(self):
        self.committed = True

    def reset_commit(self):
        self.committed = False


def test_add_tribe():
    tribe_repo = FakeTribeRepository()
    tribe = build_tribes(1)[0]
    conn = FakeConn()
    services.add_tribe(
        name=tribe.name, level=tribe.level, tribe_repo=tribe_repo, conn=conn
    )

    assert conn.committed is True
    assert tribe_repo.list() == [tribe]


def test_add_tribe_fail_exists():
    tribe_repo = FakeTribeRepository()
    tribe = build_tribes(1)[0]
    conn = FakeConn()
    services.add_tribe(
        name=tribe.name, level=tribe.level, tribe_repo=tribe_repo, conn=conn
    )
    conn.reset_commit()

    with pytest.raises(TribeExists):
        services.add_tribe(
            name=tribe.name, level=tribe.level, tribe_repo=tribe_repo, conn=conn
        )

    assert conn.committed == False


def test_update_tribe():
    tribes = build_tribes(3)
    tribe_repo = FakeTribeRepository(tribes)
    conn = FakeConn()

    other_level = "iouiouiou"
    tribes[0].level = other_level
    services.update_tribe(
        name=tribes[0].name, level=other_level, tribe_repo=tribe_repo, conn=conn
    )

    assert conn.committed is True
    assert set(tribe_repo.list()) == set(tribes)


def test_update_tribe_fail_not_exists():
    tribes = build_tribes(3)
    tribe_repo = FakeTribeRepository(tribes)
    conn = FakeConn()

    with pytest.raises(TribeDoesNotExist):
        services.update_tribe(
            name="azerty", level="jkl", tribe_repo=tribe_repo, conn=conn
        )

    assert conn.committed == False


def test_delete_tribe():
    tribes = build_tribes(3)
    tribe_repo = FakeTribeRepository(tribes)
    conn = FakeConn()

    tribe = tribes.pop()
    services.delete_tribe(name=tribe.name, tribe_repo=tribe_repo, conn=conn)

    assert conn.committed is True
    assert set(tribe_repo.list()) == set(tribes)


def test_delete_tribe_fail_not_exists():
    tribes = build_tribes(3)
    tribe_repo = FakeTribeRepository(tribes)
    conn = FakeConn()

    with pytest.raises(TribeDoesNotExist):
        services.delete_tribe(name="azerty", tribe_repo=tribe_repo, conn=conn)

    assert conn.committed == False


def test_add_student():
    tribes = build_tribes(1)
    tribe_repo = FakeTribeRepository(tribes)
    student = build_student(tribes, 1)[0]
    student_repo = FakeStudentRepository()
    conn = FakeConn()

    saved_student = services.add_student(
        name=student.name,
        tribe=student.tribe.name,
        student_repo=student_repo,
        tribe_repo=tribe_repo,
        conn=conn,
    )

    assert conn.committed is True

    listed_student = student_repo.list()[0]

    assert student.name == listed_student.name
    assert student.tribe.name == listed_student.tribe.name
    # The id is not passed to the service, they can't have the same.
    assert student.id != listed_student.id

    assert saved_student == listed_student


def test_add_student_tribe_doesnt_exist():
    tribes = build_tribes(1)
    tribe_repo = FakeTribeRepository(tribes)
    students = build_student(tribes, 1)
    student_repo = FakeStudentRepository()
    conn = FakeConn()

    student = students[0]
    with pytest.raises(TribeDoesNotExist):
        services.add_student(
            name=student.name,
            tribe="iuouiouiouio",
            student_repo=student_repo,
            tribe_repo=tribe_repo,
            conn=conn,
        )

    assert conn.committed is False


def test_update_student():
    tribes = build_tribes(2)
    tribe_repo = FakeTribeRepository(tribes)
    students = build_student(tribes, 1)
    student_repo = FakeStudentRepository(students)
    conn = FakeConn()

    id = students[0].id
    new_name = "new name"
    new_tribe_name = tribes[1].name

    saved_student = services.update_student(
        id=id,
        name=new_name,
        tribe=new_tribe_name,
        student_repo=student_repo,
        tribe_repo=tribe_repo,
        conn=conn,
    )

    assert conn.committed is True

    mod_student = student_repo.get(id)
    assert mod_student.name == new_name
    assert mod_student.tribe.name == new_tribe_name

    listed_student = student_repo.list()
    assert len(listed_student) == 2


def test_update_student_tribe_doesnt_exists():
    tribes = build_tribes(2)
    tribe_repo = FakeTribeRepository(tribes)
    students = build_student(tribes, 1)
    student_repo = FakeStudentRepository(students)
    conn = FakeConn()

    id = students[0].id
    new_name = "new name"
    new_tribe_name = "not existing tribe"

    with pytest.raises(TribeDoesNotExist):
        services.update_student(
            id=id,
            name=new_name,
            tribe=new_tribe_name,
            student_repo=student_repo,
            tribe_repo=tribe_repo,
            conn=conn,
        )

    assert conn.committed is False

    mod_student = student_repo.get(id)
    assert mod_student.name == students[0].name
    assert mod_student.tribe.name == students[0].tribe.name

    listed_student = student_repo.list()
    assert len(listed_student) == 2


def test_update_student_doesnt_exists():
    tribes = build_tribes(2)
    tribe_repo = FakeTribeRepository(tribes)
    students = build_student(tribes, 1)
    student_repo = FakeStudentRepository(students)
    conn = FakeConn()

    id = "not existing id"
    new_name = students[0].name
    new_tribe_name = students[0].tribe.name

    with pytest.raises(StudentDoesExist):
        services.update_student(
            id=id,
            name=new_name,
            tribe=new_tribe_name,
            student_repo=student_repo,
            tribe_repo=tribe_repo,
            conn=conn,
        )

    assert conn.committed is False

    original_student = student_repo.get(students[0].id)
    assert original_student.name == students[0].name
    assert original_student.tribe.name == students[0].tribe.name

    listed_student = student_repo.list()
    assert len(listed_student) == 2