from datetime import datetime, date, timedelta
import numpy as np
import json


def get_workouts(topsets):
    # Get all unique workout_ids (No duplicates)
    workout_ids = list(set([t['WorkoutId']
                            for t in topsets if t['WorkoutId'] is not None]))

    # Group topsets into workouts
    workouts = []
    for workout_id in reversed(workout_ids):
        topsets_in_workout = [
            t for t in topsets if t['WorkoutId'] == workout_id]
        workouts.append({
            'WorkoutId': workout_id,
            'StartDate': topsets_in_workout[0]['StartDate'],
            'TopSets': [{"TopSetId": t['TopSetId'], "ExerciseId": t['ExerciseId'], "ExerciseName": t['ExerciseName'], "Weight": t['Weight'], "Repetitions": t['Repetitions'], "Estimated1RM": t['Estimated1RM']} for t in topsets_in_workout if t['TopSetId'] is not None]
        })

    workouts.sort(key=lambda x: x['StartDate'], reverse=True)

    return workouts


def get_all_exercises_from_topsets(topsets):
    exercise_ids = set([t['ExerciseId']
                       for t in topsets if t['ExerciseId'] is not None])
    exercises = []
    for exercise_id in exercise_ids:
        exercises.append({
            'ExerciseId': exercise_id,
            'ExerciseName': next((t['ExerciseName'] for t in topsets if t['ExerciseId'] == exercise_id), 'Unknown')
        })
    return exercises

def get_topsets_for_person(person_topsets):
    person_exercises = get_all_exercises_from_topsets(person_topsets)

    exercises_topsets = []
    for e in person_exercises:
        exercise_topsets = [t for t in person_topsets if t['ExerciseId'] == e['ExerciseId']]

        # Sort topsets by StartDate in descending order
        sorted_topsets = sorted(exercise_topsets, key=lambda x: x['StartDate'], reverse=True)

        # Extracting values and calculating value ranges for SVG dimensions
        estimated_1rm = [t['Estimated1RM'] for t in exercise_topsets]
        repetitions = [t['Repetitions'] for t in exercise_topsets]
        weight = [t['Weight'] for t in exercise_topsets]
        start_dates = [t['StartDate'] for t in exercise_topsets]
        messages = [f'{t["Repetitions"]} x {t["Weight"]}kg ({t["Estimated1RM"]}kg E1RM) on {t["StartDate"].strftime("%d %b %y")}' for t in exercise_topsets]

        exercise_progress = get_exercise_graph_model(exercise_topsets[0]['ExerciseName'], estimated_1rm, repetitions, weight, start_dates, messages)

        exercises_topsets.append({
            'ExerciseId': e['ExerciseId'],
            'ExerciseName': e['ExerciseName'],
            'Topsets': sorted_topsets,
            'ExerciseProgressGraph': exercise_progress
        })

    return exercises_topsets



def get_people_and_exercise_rep_maxes(topsets, selected_person_ids, selected_exercise_ids, min_date, max_date):
    # Get all unique workout_ids (No duplicates)
    people_ids = set([t['PersonId']
                     for t in topsets])
    filtered_people_ids = [p for p in people_ids if p in selected_person_ids]

    # Group topsets into workouts
    people = []
    for person_id in filtered_people_ids:
        workouts_for_person = [
            t for t in topsets if t['PersonId'] == person_id and t['ExerciseId'] in selected_exercise_ids and t['StartDate'] >= min_date and t['StartDate'] <= max_date]
        if workouts_for_person:
            people.append({
                'PersonId': person_id,
                'PersonName': workouts_for_person[0]['PersonName'],
                'NumberOfWorkouts': len(list(set([t['WorkoutId'] for t in workouts_for_person if t['WorkoutId'] is not None]))),
                'Exercises': get_topsets_for_person(workouts_for_person)
            })
    return {"People": people, "Stats": get_stats_from_topsets(topsets)}


def get_stats_from_topsets(topsets):
    workout_count = len(set([t['WorkoutId']
                             for t in topsets if t['WorkoutId'] is not None]))
    people_count = len(set([t['PersonId']
                            for t in topsets if t['PersonId'] is not None]))
    workout_start_dates = [t['StartDate']
                           for t in topsets if t['StartDate'] is not None]

    stats = [{"Text": "Total Workouts", "Value": workout_count},
             {"Text": "Total Sets", "Value": len(topsets)}]
    if people_count > 1:
        stats.append({"Text": "People tracked", "Value": people_count})
    if workout_count > 0:
        first_workout_date = min(workout_start_dates)
        last_workout_date = max(workout_start_dates)

        stats.append({"Text": "Days Since First Workout", "Value": (
            date.today() - first_workout_date).days})
        if workout_count >= 2:
            stats.append({"Text": "Days Since Last Workout",
                          "Value": (
                              date.today() - last_workout_date).days})
            average_number_sets_per_workout = round(
                len(topsets) / workout_count, 1)
            stats.append({"Text": "Average sets per workout",
                         "Value": average_number_sets_per_workout})

            training_duration = last_workout_date - first_workout_date
            if training_duration > timedelta(days=0):
                average_workouts_per_week = round(
                    workout_count / (training_duration.days / 7), 1)
                stats.append({"Text": "Average Workouts Per Week",
                              "Value": average_workouts_per_week})

    return stats


def convert_str_to_date(date_str, format='%Y-%m-%d'):
    try:
        return datetime.strptime(date_str, format).date()
    except ValueError:
        return None
    except TypeError:
        return None


def get_earliest_and_latest_workout_date(person):
    if len(person['Workouts']) > 0:
        return (min(person['Workouts'], key=lambda x: x['StartDate'])['StartDate'], max(person['Workouts'], key=lambda x: x['StartDate'])['StartDate'])
    return (datetime.now().date(), datetime.now().date())


def filter_workout_topsets(workout, selected_exercise_ids):
    workout['TopSets'] = [topset for topset in workout['TopSets']
                          if topset['ExerciseId'] in selected_exercise_ids]
    return workout


def get_exercise_ids_from_workouts(workouts):
    return list(set(flatten_list(list(map(lambda x: list(
        map(lambda y: y['ExerciseId'], x['TopSets'])), workouts)))))


def flatten_list(list_of_lists):
    return [item for sublist in list_of_lists for item in sublist]


def first_and_last_visible_days_in_month(first_day_of_month, last_day_of_month):
    start = dict([(6, 0), (0, 1), (1, 2), (2, 3), (3, 4), (4, 5), (5, 6)])
    start_date = first_day_of_month - \
        timedelta(days=start[first_day_of_month.weekday()])

    end = dict([(6, 6), (0, 5), (1, 4), (2, 3), (3, 2), (4, 1), (5, 0)])
    end_date = last_day_of_month + \
        timedelta(days=end[last_day_of_month.weekday()])
    return (start_date, end_date)


def flatten(lst):
    """
    Flatten a list of lists.
    """
    result = []
    for item in lst:
        if isinstance(item, list):
            result.extend(flatten(item))
        else:
            result.append(item)
    return result


def get_date_info(input_date, selected_view):
    if selected_view not in ['month', 'year']:
        raise ValueError(
            'selected_view must be either "month" or "year"')

    # First day of the month
    first_day_of_month = input_date.replace(day=1)

    # Last day of the month
    if input_date.month == 12:
        last_day_of_month = input_date.replace(
            year=input_date.year+1, month=1, day=1) - timedelta(days=1)
    else:
        last_day_of_month = input_date.replace(
            month=input_date.month+1, day=1) - timedelta(days=1)

    # First and last day of the year
    first_day_of_year = input_date.replace(month=1, day=1)
    last_day_of_year = input_date.replace(
        year=input_date.year+1, month=1, day=1) - timedelta(days=1)

    # Next/previous month
    year, month = divmod(input_date.year * 12 + input_date.month, 12)
    next_month = date(year, month + 1, 1)
    prev_month_last_day = first_day_of_month - timedelta(days=1)
    prev_month = prev_month_last_day.replace(day=1)

    # Next/previous year
    next_year = input_date.replace(year=input_date.year+1)
    prev_year = input_date.replace(year=input_date.year-1)

    # Business logic, should move above to a separate function
    if selected_view == 'month':
        # Step 1: Find the first Sunday before or on the first day of the month
        days_to_subtract = (first_day_of_month.weekday() + 1) % 7
        start_date = first_day_of_month - timedelta(days=days_to_subtract)

        # Step 2: Calculate the last day to display, based on the number of weeks
        end_date = start_date + timedelta(days=6 * 7 - 1)

        return {
            'next_date': next_month,
            'previous_date': prev_month,
            'first_date_of_view': first_day_of_month,
            'last_date_of_view': last_day_of_month,
            'start_date': start_date,
            'end_date': end_date,
        }
    elif selected_view == 'year':
        return {
            'next_date': next_year,
            'previous_date': prev_year,
            'first_date_of_view': first_day_of_year,
            'last_date_of_view': last_day_of_year,
            'start_date': first_day_of_year,
            'end_date': last_day_of_year,
        }

def get_exercise_graph_model(title, estimated_1rm, repetitions, weight, start_dates, messages):
    min_date, max_date = min(start_dates), max(start_dates)
    min_e1rm, max_e1rm = min(estimated_1rm), max(estimated_1rm)
    min_reps, max_reps = min(repetitions), max(repetitions)
    min_weight, max_weight = min(weight), max(weight)
    
    # Calculate viewBox dimensions
    date_range = max_date - min_date
    total_span = date_range.days or 1
    e1rm_range = (max_e1rm - min_e1rm) or 1
    reps_range = (max_reps - min_reps) or 1
    weight_range = (max_weight - min_weight) or 1
    vb_width, vb_height = total_span, e1rm_range
    vb_width *= 200 / vb_width  # Scale to 200px width
    vb_height *= 75 / vb_height  # Scale to 75px height

    # Scale estimated_1rm values for SVG plotting
    estimated_1rm_scaled = [((value - min_e1rm) / e1rm_range) * vb_height for value in estimated_1rm]
    repetitions_scaled = [((value - min_reps) / reps_range) * vb_height for value in repetitions]
    weight_scaled = [((value - min_weight) / weight_range) * vb_height for value in weight]
    
    relative_positions = [(date - min_date).days / total_span for date in start_dates]

    best_fit_points = []
    # trry catch LinAlgError
    try:
        # Convert relative positions and scaled estimated 1RM values to numpy arrays
        x = np.array(relative_positions)
        y = np.array(estimated_1rm_scaled)

        # Calculate the slope (m) and y-intercept (b) of the line of best fit
        m, b = np.polyfit(x, y, 1)

        # Generate points along the line of best fit
        y_best_fit = [m * xi + b for xi in x]
        best_fit_points = list(zip(y_best_fit, relative_positions))
    except np.linalg.LinAlgError:
        pass

    # Create messages and zip data for SVG plotting
    estimated_1rm_points = zip(estimated_1rm_scaled, relative_positions)
    repetitions_points = zip(repetitions_scaled, relative_positions)
    weight_points = zip(weight_scaled, relative_positions)

    repetitions = {
        'label': 'Reps',
        'color': '#388fed',
        'points': list(repetitions_points)
    }
    weight = {
        'label': 'Weight',
        'color': '#bd3178',
        'points': list(weight_points)
    }
    estimated_1rm = {
        'label': 'E1RM',
        'color': '#2ca02c',
        'points': list(estimated_1rm_points)
    }

    plot_labels = zip(relative_positions, messages)

    # Return exercise data with SVG dimensions and data points
    return {
        'title': title,
        'vb_width': vb_width,
        'vb_height': vb_height,
        'plots': [repetitions, weight, estimated_1rm],
        'best_fit_points': best_fit_points,
        'plot_labels': plot_labels
    }