import datetime

from django.utils import timezone

from homeschool.courses.models import Course
from homeschool.students.models import Coursework, Student


class Forecaster:
    """For project dates about school years and courses"""

    def get_last_forecast_date(
        self, student: Student, course: Course
    ) -> datetime.date | None:
        """Get the last forecast date of course for the student."""
        task_items = self.get_task_items(student, course)
        if not task_items:
            return None

        task_item = task_items[-1]
        if "planned_date" in task_item:
            return task_item["planned_date"]
        return task_item["coursework"].completed_date

    def get_items_by_task(self, student: Student | None, course: Course) -> dict:
        """Get information about the tasks keyed by the task."""
        return {
            item["course_task"]: item for item in self.get_task_items(student, course)
        }

    def get_task_items(self, student, course):
        today = timezone.localdate()

        # When the school year isn't in progress yet,
        # the offset calculations should come
        # relative to the start of the school year.
        school_year = course.school_year
        if today < school_year.start_date:
            today = school_year.start_date

        if not school_year.is_break(today, student=student) and course.runs_on(today):
            next_course_day = today
        else:
            next_course_day = school_year.get_next_course_day(course, today, student)

        course_is_running = course.is_running
        coursework_by_task = self._get_course_work_by_task(student, course)

        if student:
            course_tasks = student.get_tasks_for(course).select_related("graded_work")
        else:
            course_tasks = course.course_tasks.all()

        task_items = []
        for course_task in course_tasks:
            task_item = {
                "course_task": course_task,
                "has_graded_work": hasattr(course_task, "graded_work"),
            }
            if course_task in coursework_by_task:
                coursework = coursework_by_task[course_task]
                # Advance the next course day to deconflict with coursework.
                if coursework.completed_date == next_course_day:
                    next_course_day = school_year.get_next_course_day(
                        course, next_course_day, student
                    )
                task_item["coursework"] = coursework
            elif course_is_running:
                task_item["planned_date"] = next_course_day
                next_course_day = school_year.get_next_course_day(
                    course, next_course_day, student
                )
            task_items.append(task_item)

        return task_items

    def _get_course_work_by_task(self, student, course):
        coursework = Coursework.objects.filter(
            student=student, course_task__course=course
        ).select_related("course_task")
        return {c.course_task: c for c in coursework}

dddc581291f46e312731a455a21ff1ba53ac619c
<mask token>


class Forecaster:
    <mask token>
    <mask token>

    def get_items_by_task(self, student: (Student | None), course: Course
        ) ->dict:
        """Get information about the tasks keyed by the task."""
        return {item['course_task']: item for item in self.get_task_items(
            student, course)}
    <mask token>

    def _get_course_work_by_task(self, student, course):
        coursework = Coursework.objects.filter(student=student,
            course_task__course=course).select_related('course_task')
        return {c.course_task: c for c in coursework}

<mask token>


class Forecaster:
    <mask token>
    <mask token>

    def get_items_by_task(self, student: (Student | None), course: Course
        ) ->dict:
        """Get information about the tasks keyed by the task."""
        return {item['course_task']: item for item in self.get_task_items(
            student, course)}

    def get_task_items(self, student, course):
        today = timezone.localdate()
        school_year = course.school_year
        if today < school_year.start_date:
            today = school_year.start_date
        if not school_year.is_break(today, student=student) and course.runs_on(
            today):
            next_course_day = today
        else:
            next_course_day = school_year.get_next_course_day(course, today,
                student)
        course_is_running = course.is_running
        coursework_by_task = self._get_course_work_by_task(student, course)
        if student:
            course_tasks = student.get_tasks_for(course).select_related(
                'graded_work')
        else:
            course_tasks = course.course_tasks.all()
        task_items = []
        for course_task in course_tasks:
            task_item = {'course_task': course_task, 'has_graded_work':
                hasattr(course_task, 'graded_work')}
            if course_task in coursework_by_task:
                coursework = coursework_by_task[course_task]
                if coursework.completed_date == next_course_day:
                    next_course_day = school_year.get_next_course_day(course,
                        next_course_day, student)
                task_item['coursework'] = coursework
            elif course_is_running:
                task_item['planned_date'] = next_course_day
                next_course_day = school_year.get_next_course_day(course,
                    next_course_day, student)
            task_items.append(task_item)
        return task_items

    def _get_course_work_by_task(self, student, course):
        coursework = Coursework.objects.filter(student=student,
            course_task__course=course).select_related('course_task')
        return {c.course_task: c for c in coursework}

<mask token>


class Forecaster:
    """For project dates about school years and courses"""

    def get_last_forecast_date(self, student: Student, course: Course) ->(
        datetime.date | None):
        """Get the last forecast date of course for the student."""
        task_items = self.get_task_items(student, course)
        if not task_items:
            return None
        task_item = task_items[-1]
        if 'planned_date' in task_item:
            return task_item['planned_date']
        return task_item['coursework'].completed_date

    def get_items_by_task(self, student: (Student | None), course: Course
        ) ->dict:
        """Get information about the tasks keyed by the task."""
        return {item['course_task']: item for item in self.get_task_items(
            student, course)}

    def get_task_items(self, student, course):
        today = timezone.localdate()
        school_year = course.school_year
        if today < school_year.start_date:
            today = school_year.start_date
        if not school_year.is_break(today, student=student) and course.runs_on(
            today):
            next_course_day = today
        else:
            next_course_day = school_year.get_next_course_day(course, today,
                student)
        course_is_running = course.is_running
        coursework_by_task = self._get_course_work_by_task(student, course)
        if student:
            course_tasks = student.get_tasks_for(course).select_related(
                'graded_work')
        else:
            course_tasks = course.course_tasks.all()
        task_items = []
        for course_task in course_tasks:
            task_item = {'course_task': course_task, 'has_graded_work':
                hasattr(course_task, 'graded_work')}
            if course_task in coursework_by_task:
                coursework = coursework_by_task[course_task]
                if coursework.completed_date == next_course_day:
                    next_course_day = school_year.get_next_course_day(course,
                        next_course_day, student)
                task_item['coursework'] = coursework
            elif course_is_running:
                task_item['planned_date'] = next_course_day
                next_course_day = school_year.get_next_course_day(course,
                    next_course_day, student)
            task_items.append(task_item)
        return task_items

    def _get_course_work_by_task(self, student, course):
        coursework = Coursework.objects.filter(student=student,
            course_task__course=course).select_related('course_task')
        return {c.course_task: c for c in coursework}

import datetime
from django.utils import timezone
from homeschool.courses.models import Course
from homeschool.students.models import Coursework, Student


class Forecaster:
    """For project dates about school years and courses"""

    def get_last_forecast_date(self, student: Student, course: Course) ->(
        datetime.date | None):
        """Get the last forecast date of course for the student."""
        task_items = self.get_task_items(student, course)
        if not task_items:
            return None
        task_item = task_items[-1]
        if 'planned_date' in task_item:
            return task_item['planned_date']
        return task_item['coursework'].completed_date

    def get_items_by_task(self, student: (Student | None), course: Course
        ) ->dict:
        """Get information about the tasks keyed by the task."""
        return {item['course_task']: item for item in self.get_task_items(
            student, course)}

    def get_task_items(self, student, course):
        today = timezone.localdate()
        school_year = course.school_year
        if today < school_year.start_date:
            today = school_year.start_date
        if not school_year.is_break(today, student=student) and course.runs_on(
            today):
            next_course_day = today
        else:
            next_course_day = school_year.get_next_course_day(course, today,
                student)
        course_is_running = course.is_running
        coursework_by_task = self._get_course_work_by_task(student, course)
        if student:
            course_tasks = student.get_tasks_for(course).select_related(
                'graded_work')
        else:
            course_tasks = course.course_tasks.all()
        task_items = []
        for course_task in course_tasks:
            task_item = {'course_task': course_task, 'has_graded_work':
                hasattr(course_task, 'graded_work')}
            if course_task in coursework_by_task:
                coursework = coursework_by_task[course_task]
                if coursework.completed_date == next_course_day:
                    next_course_day = school_year.get_next_course_day(course,
                        next_course_day, student)
                task_item['coursework'] = coursework
            elif course_is_running:
                task_item['planned_date'] = next_course_day
                next_course_day = school_year.get_next_course_day(course,
                    next_course_day, student)
            task_items.append(task_item)
        return task_items

    def _get_course_work_by_task(self, student, course):
        coursework = Coursework.objects.filter(student=student,
            course_task__course=course).select_related('course_task')
        return {c.course_task: c for c in coursework}

import datetime

from django.utils import timezone

from homeschool.courses.models import Course
from homeschool.students.models import Coursework, Student


class Forecaster:
    """For project dates about school years and courses"""

    def get_last_forecast_date(
        self, student: Student, course: Course
    ) -> datetime.date | None:
        """Get the last forecast date of course for the student."""
        task_items = self.get_task_items(student, course)
        if not task_items:
            return None

        task_item = task_items[-1]
        if "planned_date" in task_item:
            return task_item["planned_date"]
        return task_item["coursework"].completed_date

    def get_items_by_task(self, student: Student | None, course: Course) -> dict:
        """Get information about the tasks keyed by the task."""
        return {
            item["course_task"]: item for item in self.get_task_items(student, course)
        }

    def get_task_items(self, student, course):
        today = timezone.localdate()

        # When the school year isn't in progress yet,
        # the offset calculations should come
        # relative to the start of the school year.
        school_year = course.school_year
        if today < school_year.start_date:
            today = school_year.start_date

        if not school_year.is_break(today, student=student) and course.runs_on(today):
            next_course_day = today
        else:
            next_course_day = school_year.get_next_course_day(course, today, student)

        course_is_running = course.is_running
        coursework_by_task = self._get_course_work_by_task(student, course)

        if student:
            course_tasks = student.get_tasks_for(course).select_related("graded_work")
        else:
            course_tasks = course.course_tasks.all()

        task_items = []
        for course_task in course_tasks:
            task_item = {
                "course_task": course_task,
                "has_graded_work": hasattr(course_task, "graded_work"),
            }
            if course_task in coursework_by_task:
                coursework = coursework_by_task[course_task]
                # Advance the next course day to deconflict with coursework.
                if coursework.completed_date == next_course_day:
                    next_course_day = school_year.get_next_course_day(
                        course, next_course_day, student
                    )
                task_item["coursework"] = coursework
            elif course_is_running:
                task_item["planned_date"] = next_course_day
                next_course_day = school_year.get_next_course_day(
                    course, next_course_day, student
                )
            task_items.append(task_item)

        return task_items

    def _get_course_work_by_task(self, student, course):
        coursework = Coursework.objects.filter(
            student=student, course_task__course=course
        ).select_related("course_task")
        return {c.course_task: c for c in coursework}
