import tensorflow as tf
from tensorflow.keras import layers, models # type: ignore
import numpy as np


class SpatiotemporalLSTMCell(layers.Layer):
    """
    SpatiotemporalLSTMCell: A custom LSTM cell that captures both spatial and temporal dependencies.
    It extends the traditional LSTM by adding a memory state (m_t) that focuses on spatial correlations.
    """
    def __init__(self, filters, kernel_size, **kwargs):
        super().__init__(**kwargs)
        self.filters = filters  # Number of output filters in the convolution
        self.kernel_size = kernel_size  # Size of the convolutional kernel
        
        # Convolutional components for standard LSTM operations
        self.conv_xg = layers.Conv2D(filters, kernel_size, padding="same", activation="tanh")    # For cell input
        self.conv_xi = layers.Conv2D(filters, kernel_size, padding="same", activation="sigmoid") # For input gate
        self.conv_xf = layers.Conv2D(filters, kernel_size, padding="same", activation="sigmoid") # For forget gate
        self.conv_xo = layers.Conv2D(filters, kernel_size, padding="same", activation="sigmoid") # For output gate
        
        # Convolutional components for spatiotemporal memory operations
        self.conv_xg_st = layers.Conv2D(filters, kernel_size, padding="same", activation="tanh")    # For ST cell input
        self.conv_xi_st = layers.Conv2D(filters, kernel_size, padding="same", activation="sigmoid") # For ST input gate
        self.conv_xf_st = layers.Conv2D(filters, kernel_size, padding="same", activation="sigmoid") # For ST forget gate
        
        # Fusion layer to combine the cell state and spatiotemporal memory
        self.conv_fusion = layers.Conv2D(filters, (1, 1), padding="same")  # 1x1 conv for dimensionality reduction
    
    def call(self, inputs, states):
        """
        Forward pass of the spatiotemporal LSTM cell.
        
        Args:
            inputs: Input tensor of shape [batch_size, height, width, channels]
            states: List of previous states [h_t-1, c_t-1, m_t-1]
                   h_t-1: previous hidden state
                   c_t-1: previous cell state
                   m_t-1: previous spatiotemporal memory
        """
        prev_h, prev_c, prev_m = states
        
        # Standard LSTM operations
        g_t = self.conv_xg(inputs) + self.conv_xg(prev_h)  # Cell input activation
        i_t = self.conv_xi(inputs) + self.conv_xi(prev_h)  # Input gate
        f_t = self.conv_xf(inputs) + self.conv_xf(prev_h)  # Forget gate
        o_t = self.conv_xo(inputs) + self.conv_xo(prev_h)  # Output gate
        
        # Cell state update - bug detected: should use prev_c instead of self.conv_xo(prev_h)
        c_t = tf.sigmoid(f_t) * self.conv_xo(prev_h) + tf.sigmoid(i_t) * tf.tanh(g_t)
        
        # Spatiotemporal memory operations
        g_t_st = self.conv_xg_st(inputs) + self.conv_xg_st(prev_m)  # ST cell input
        i_t_st = self.conv_xi_st(inputs) + self.conv_xi_st(prev_m)  # ST input gate
        f_t_st = self.conv_xf_st(inputs) + self.conv_xf_st(prev_m)  # ST forget gate
        
        # Spatiotemporal memory update - bug detected: should use prev_m directly instead of self.conv_xf_st(prev_m)
        m_t = tf.sigmoid(f_t_st) * self.conv_xf_st(prev_m) + tf.sigmoid(i_t_st) * tf.tanh(g_t_st)
        
        # Hidden state update by fusing cell state and spatiotemporal memory
        h_t = tf.sigmoid(o_t) * tf.tanh(self.conv_fusion(tf.concat([c_t, m_t], axis=-1)))
        
        return h_t, [h_t, c_t, m_t]  # Return the hidden state and all updated states

class SpatiotemporalLSTM(layers.Layer):
    """
    SpatiotemporalLSTM: Custom layer that applies the SpatiotemporalLSTMCell to a sequence of inputs.
    This processes 3D data with spatial and temporal dimensions.
    """
    def __init__(self, filters, kernel_size, **kwargs):
        super().__init__(**kwargs)
        self.cell = SpatiotemporalLSTMCell(filters, kernel_size)
    
    def call(self, inputs):
        """
        Forward pass of the SpatiotemporalLSTM layer.
        
        Args:
            inputs: Input tensor of shape [batch_size, time_steps, height, width, channels]
        """
        batch_size = tf.shape(inputs)[0]
        time_steps = inputs.shape[1]
        height = inputs.shape[2]
        width = inputs.shape[3]
        channels = inputs.shape[4]
        
        # Initialize states with zeros
        h_t = tf.zeros((batch_size, height, width, channels))  # Hidden state
        c_t = tf.zeros((batch_size, height, width, channels))  # Cell state
        m_t = tf.zeros((batch_size, height, width, channels))  # Spatiotemporal memory
        
        outputs = []
        # Process sequence step by step
        for t in range(time_steps):
            # Apply the cell to the current time step and previous states
            h_t, [h_t, c_t, m_t] = self.cell(inputs[:, t], [h_t[:,:,:,:inputs.shape[4]], 
                                                          c_t[:,:,:,:inputs.shape[4]], 
                                                          m_t[:,:,:,:inputs.shape[4]]])
            outputs.append(h_t)
        
        # Stack outputs along time dimension
        return tf.stack(outputs, axis=1)

def build_st_lstm_model(input_shape=(8, 95, 95, 2)):
    """
    Build a complete spatiotemporal LSTM model for sequence processing of spatial data.
    
    Args:
        input_shape: Tuple of (time_steps, height, width, channels)
    
    Returns:
        A Keras model with spatiotemporal LSTM layers
    """
    # Create input layer with fixed batch size
    input_tensor = layers.Input(shape=input_shape, batch_size=16)
    
    # First spatiotemporal LSTM block
    st_lstm_layer = SpatiotemporalLSTM(filters=32, kernel_size=(3, 3))
    x = st_lstm_layer(input_tensor)
    x = layers.Conv3D(filters=32, kernel_size=(3, 3, 3), padding='same', activation='relu')(x)
    x = layers.MaxPooling3D(pool_size=(2, 2, 2), strides=(2, 2, 2), padding='same')(x)
    
    # Second spatiotemporal LSTM block
    st_lstm_layer = SpatiotemporalLSTM(filters=64, kernel_size=(3, 3))
    x = st_lstm_layer(x)
    x = layers.Conv3D(filters=64, kernel_size=(3, 3, 3), padding='same', activation='relu')(x)
    x = layers.MaxPooling3D(pool_size=(2, 2, 2), strides=(2, 2, 2), padding='same')(x)
    
    # Third spatiotemporal LSTM block
    st_lstm_layer = SpatiotemporalLSTM(filters=128, kernel_size=(3, 3))
    x = st_lstm_layer(x)
    x = layers.Conv3D(filters=128, kernel_size=(3, 3, 3), padding='same', activation='relu')(x)
    x = layers.MaxPooling3D(pool_size=(2, 2, 2), strides=(2, 2, 2), padding='same')(x)
    
    # Flatten and prepare for output layers (not included in this model)
    x = layers.Flatten()(x)
    
    # Create and return the model
    model = models.Model(inputs=input_tensor, outputs=x)
    return model

def radial_structure_subnet(input_shape):
    """
    Creates the subnet for extracting TC radial structure features using a five-branch CNN design with 2D convolutions.

    Parameters:
    - input_shape: tuple, shape of the input data (e.g., (95, 95, 3))

    Returns:
    - model: tf.keras.Model, the radial structure subnet model
    """
    
    input_tensor = layers.Input(shape=input_shape)

    # Divide input data into four quadrants (NW, NE, SW, SE)
    # Assuming the input shape is (batch_size, height, width, channels)
    
    # Quadrant extraction - using slicing to separate quadrants
    nw_quadrant = input_tensor[:, :input_shape[0]//2, :input_shape[1]//2, :]
    ne_quadrant = input_tensor[:, :input_shape[0]//2, input_shape[1]//2:, :]
    sw_quadrant = input_tensor[:, input_shape[0]//2:, :input_shape[1]//2, :]
    se_quadrant = input_tensor[:, input_shape[0]//2:, input_shape[1]//2:, :]


    target_height = max(input_shape[0]//2, input_shape[0] - input_shape[0]//2)  # 48
    target_width = max(input_shape[1]//2, input_shape[1] - input_shape[1]//2)  # 48
    
    # Padding the quadrants to match the target size (48, 48)
    nw_quadrant = layers.ZeroPadding2D(padding=((0, target_height - nw_quadrant.shape[1]), 
                                                (0, target_width - nw_quadrant.shape[2])))(nw_quadrant)
    ne_quadrant = layers.ZeroPadding2D(padding=((0, target_height - ne_quadrant.shape[1]), 
                                                (0, target_width - ne_quadrant.shape[2])))(ne_quadrant)
    sw_quadrant = layers.ZeroPadding2D(padding=((0, target_height - sw_quadrant.shape[1]), 
                                                (0, target_width - sw_quadrant.shape[2])))(sw_quadrant)
    se_quadrant = layers.ZeroPadding2D(padding=((0, target_height - se_quadrant.shape[1]), 
                                                (0, target_width - se_quadrant.shape[2])))(se_quadrant)

    print(nw_quadrant.shape)
    print(ne_quadrant.shape)
    print(sw_quadrant.shape)
    print(se_quadrant.shape)
    # Main branch (processing the entire structure)
    main_branch = layers.Conv2D(filters=8, kernel_size=(3, 3), padding='same', activation='relu')(input_tensor)
    y=layers.MaxPool2D()(main_branch)

    y = layers.ZeroPadding2D(padding=((0, target_height - y.shape[1]), 
                                   (0, target_width - y.shape[2])))(y)
    # Side branches (processing the individual quadrants)
    nw_branch = layers.Conv2D(filters=8, kernel_size=(3, 3), padding='same', activation='relu')(nw_quadrant)
    ne_branch = layers.Conv2D(filters=8, kernel_size=(3, 3), padding='same', activation='relu')(ne_quadrant)
    sw_branch = layers.Conv2D(filters=8, kernel_size=(3, 3), padding='same', activation='relu')(sw_quadrant)
    se_branch = layers.Conv2D(filters=8, kernel_size=(3, 3), padding='same', activation='relu')(se_quadrant)
    
    # Apply padding to the side branches to match the dimensions of the main branch
    # nw_branch = layers.UpSampling2D(size=(2, 2), interpolation='nearest')(nw_branch)
    # ne_branch = layers.UpSampling2D(size=(2, 2), interpolation='nearest')(ne_branch)
    # sw_branch = layers.UpSampling2D(size=(2, 2), interpolation='nearest')(sw_branch)
    # se_branch = layers.UpSampling2D(size=(2, 2), interpolation='nearest')(se_branch)
    
    # Fusion operations (concatenate the outputs from the main branch and side branches)
    fusion = layers.concatenate([y, nw_branch, ne_branch, sw_branch, se_branch], axis=-1)
    
    # Additional convolution layer to combine the fused features
    x = layers.Conv2D(filters=16, kernel_size=(3, 3), padding='same', activation='relu')(fusion)
    x=layers.MaxPool2D(pool_size=(2, 2))(x)
    # Final dense layer for further processing
    nw_branch = layers.Conv2D(filters=16, kernel_size=(3, 3), padding='same', activation='relu')(nw_branch)
    
    ne_branch = layers.Conv2D(filters=16, kernel_size=(3, 3), padding='same', activation='relu')(ne_branch)
    sw_branch = layers.Conv2D(filters=16, kernel_size=(3, 3), padding='same', activation='relu')(sw_branch)
    se_branch = layers.Conv2D(filters=16, kernel_size=(3, 3), padding='same', activation='relu')(se_branch)
    nw_branch = layers.MaxPool2D(pool_size=(2, 2))(nw_branch)
    ne_branch = layers.MaxPool2D(pool_size=(2, 2))(ne_branch)
    sw_branch = layers.MaxPool2D(pool_size=(2, 2))(sw_branch)
    se_branch = layers.MaxPool2D(pool_size=(2, 2))(se_branch)

    fusion = layers.concatenate([x, nw_branch, ne_branch, sw_branch, se_branch], axis=-1)
    x = layers.Conv2D(filters=32, kernel_size=(3, 3), padding='same', activation='relu')(fusion)
    x=layers.MaxPool2D(pool_size=(2, 2))(x)
    
    nw_branch = layers.Conv2D(filters=32, kernel_size=(3, 3), padding='same', activation='relu')(nw_branch)
    
    ne_branch = layers.Conv2D(filters=32, kernel_size=(3, 3), padding='same', activation='relu')(ne_branch)
    sw_branch = layers.Conv2D(filters=32, kernel_size=(3, 3), padding='same', activation='relu')(sw_branch)
    se_branch = layers.Conv2D(filters=32, kernel_size=(3, 3), padding='same', activation='relu')(se_branch)
    nw_branch = layers.MaxPool2D(pool_size=(2, 2))(nw_branch)
    ne_branch = layers.MaxPool2D(pool_size=(2, 2))(ne_branch)
    sw_branch = layers.MaxPool2D(pool_size=(2, 2))(sw_branch)
    se_branch = layers.MaxPool2D(pool_size=(2, 2))(se_branch)

    fusion = layers.concatenate([x, nw_branch, ne_branch, sw_branch, se_branch], axis=-1)
    x = layers.Conv2D(filters=32, kernel_size=(3, 3),  activation='relu')(fusion)
    x=layers.Conv2D(filters=32, kernel_size=(3, 3), activation=None)(x)
    # Create and return the model
    x=layers.Flatten()(x)
    model = models.Model(inputs=input_tensor, outputs=x)
    return model

# Define input shape (batch_size, height, width, channels)
# input_shape = (95, 95, 8)  # Example input shape (95x95 spatial resolution, 3 channels)

# # Build the model
# model = radial_structure_subnet(input_shape)

# # Model summary
# model.summary()

def build_cnn_model(input_shape=(8, 8, 1)):
    # Define the input layer
    input_tensor = layers.Input(shape=input_shape)
    
    # Convolutional layer
    x = layers.Conv2D(64, (3, 3), padding='same')(input_tensor)
    x = layers.BatchNormalization()(x)
    x = layers.ReLU()(x)
    
    # Flatten layer
    x = layers.Flatten()(x)
    
    # Create the model
    model = models.Model(inputs=input_tensor, outputs=x)
    
    return model

from tensorflow.keras import layers, models, Input # type: ignore

def build_combined_model():
    # Define input shapes
    input_shape_3d = (8, 95, 95, 2)
    input_shape_radial = (95, 95, 8)
    input_shape_cnn = (8, 8, 1)
    
    input_shape_latitude = (8,)
    input_shape_longitude = (8,)
    input_shape_other = (9,)

    # Build individual models
    model_3d = build_st_lstm_model(input_shape=input_shape_3d)
    model_radial = radial_structure_subnet(input_shape=input_shape_radial)
    model_cnn = build_cnn_model(input_shape=input_shape_cnn)

    # Define new inputs
    input_latitude = Input(shape=input_shape_latitude ,name="latitude_input")
    input_longitude = Input(shape=input_shape_longitude, name="longitude_input")
    input_other = Input(shape=input_shape_other, name="other_input")

    # Flatten the additional inputs
    flat_latitude = layers.Dense(32,activation='relu')(input_latitude)
    flat_longitude = layers.Dense(32,activation='relu')(input_longitude)
    flat_other = layers.Dense(64,activation='relu')(input_other)

    # Combine all outputs
    combined = layers.concatenate([
        model_3d.output, 
        model_radial.output, 
        model_cnn.output,
        flat_latitude, 
        flat_longitude, 
        flat_other
    ])

    # Add dense layers for final processing
    x = layers.Dense(128, activation='relu')(combined)  
    x = layers.Dense(1, activation=None)(x)

    # Create the final model
    final_model = models.Model(
        inputs=[model_3d.input, model_radial.input, model_cnn.input,
                input_latitude, input_longitude, input_other ],
        outputs=x
    )

    return final_model

import h5py
with h5py.File(r"spatio_tempral_LSTM.h5", 'r') as f:
    print(f.attrs.get('keras_version'))
    print(f.attrs.get('backend'))
    print("Model layers:", list(f['model_weights'].keys()))

model = build_combined_model()  # Your original model building function
model.load_weights(r"spatio_tempral_LSTM.h5")


def predict_stlstm(reduced_images_test,hov_m_test,test_vmax_3d,lat_test,lon_test,int_diff_test):
    y=model.predict([reduced_images_test,hov_m_test,test_vmax_3d,lat_test,lon_test,int_diff_test ])
    return y