from sklearn.cluster import KMeans
import matplotlib.pyplot as plt
import numpy as np
import random, time, math
from libs.clustering import split_tour_across_clusters

random.seed(1)

def generate_cities(nb, max_coords=1000):
    return [random.sample(range(max_coords), 2) for _ in range(nb)]

def distance(city1, city2):
    return math.sqrt((city1[0] - city2[0]) ** 2 + (city1[1] - city2[1]) ** 2)

def total_distance(cities):
    return sum([distance(cities[i - 1], cities[i]) for i in range(len(cities))])

previous_route = None

def draw_cities(cities, previous_route, color='b', title=' '):
    plt.title(title)
    
    # If there's a previous route, we remove it.
    if previous_route is not None:
        previous_route.remove()

    x = [city[0] for city in cities]
    y = [city[1] for city in cities]
    x.append(x[0])
    y.append(y[0])
    
    # We plot the route with the specified color and keep a reference to the Line2D object.
    previous_route, = plt.plot(x, y, color=color, marker='x', linestyle='-')
    
    plt.draw()
    plt.pause(0.005)

    # We return the reference so we can remove this route when a new one is found.
    return previous_route


def simulated_annealing(cities, color='b', temperature=100000, cooling_rate=0.9999, temperature_ok=0.001):
    interration = 0
    plt.ion()
    current_solution = cities.copy()
    best_solution = cities.copy()
    previous_route = draw_cities(best_solution, None, color, 'Initial solution')
    while temperature > temperature_ok:
        new_solution = current_solution.copy()
        # Swap two cities in the route
        i = random.randint(0, len(new_solution) - 1)
        j = random.randint(0, len(new_solution) - 1)
        new_solution[i], new_solution[j] = new_solution[j], new_solution[i]
        # Calculate the acceptance probability
        current_energy = total_distance(current_solution)
        new_energy = total_distance(new_solution)
        delta = new_energy - current_energy
        if delta < 0 or random.random() < math.exp(-delta / temperature):
            current_solution = new_solution
            if total_distance(current_solution) < total_distance(best_solution):
                best_solution = current_solution
                previous_route = draw_cities(best_solution, previous_route, color, 'Current best solution, total distance = ' + str(total_distance(best_solution))  + ', iteration = ' + str(interration))
        # Cool down
        temperature *= cooling_rate
        interration += 1
    plt.ioff()
    return best_solution

nb_ville = 200
max_coords = 1000
nb_truck = 4
temperature = 10000
cooling_rate = 0.999
temperature_ok = 0.000001

start_time_generate = time.time()
cities = generate_cities(nb_ville, max_coords)                # generate 100 cities
cities[0] = [max_coords/2, max_coords/2]    # placing depot at the center
stop_time_generate = time.time()


start_time_split = time.time()
clusters = split_tour_across_clusters(cities, nb_truck)
stop_time_split = time.time()

for cluster in clusters.values():
    print(len(cluster))
print("\n---- TIME ----")
print("generate cities time: ", stop_time_generate - start_time_generate)
print("split cities time: ", stop_time_split - start_time_split)

# create new figure for annealing paths
plt.figure()
colors = ['b', 'g', 'r', 'c', 'm', 'y', 'k']

for i, cluster_indices in enumerate(clusters.values()):
    # Sélection d'une couleur pour le cluster
    color = colors[i % len(colors)]
    
    # Récupération des coordonnées de la ville
    cluster_cities = [cities[index] for index in cluster_indices]

    # Appel de la fonction simulated_annealing avec la couleur choisie
    best_route = simulated_annealing(cluster_cities, color, temperature, cooling_rate, temperature_ok)
    print("Final solution for cluster ", i, ":", best_route)
    print("Total distance: ", total_distance(best_route))

plt.show()