#include <cuda_runtime.h>
#include <stdio.h>
#include <ctype.h>

#define MAX_TOKENS 1024

// Enhanced token types
typedef enum {
    TOKEN_IDENTIFIER = 0,
    TOKEN_NUMBER = 1,
    TOKEN_OPERATOR = 2,
    TOKEN_KEYWORD = 3,
    TOKEN_STRING = 4,
    TOKEN_COMMENT = 5,
    TOKEN_PREPROCESSOR = 6,
    TOKEN_PUNCTUATION = 7
} TokenType;

// Add token metadata
typedef struct {
    TokenType type;
    int start_pos;
    int end_pos;
    int length;
    int line;
    int column;
    char lexeme[256];
    unsigned int hash;
} EnhancedTokenGPU;

typedef struct {
    int type; // 0: identifier, 1: number, 2: operator
    int start_pos;
    int end_pos;
    int length;
} TokenGPU;

// Add shared memory optimization
__shared__ char shared_input[1024];
__shared__ int shared_token_count;

// Enhanced tokenization kernel with better pattern matching
__global__ void enhanced_tokenize_kernel(const char* input, size_t input_length,
                                       EnhancedTokenGPU* tokens, int* token_count,
                                       bool enable_comments, bool enable_preprocessing) {
    int idx = blockIdx.x * blockDim.x + threadIdx.x;
    if (idx >= input_length) return;

    // Load chunk into shared memory
    int local_idx = threadIdx.x;
    if (local_idx < 1024 && idx < input_length) {
        shared_input[local_idx] = input[idx];
    }
    __syncthreads();

    // Enhanced token detection with more patterns
    if (idx > 0 && (isalnum(shared_input[local_idx-1]) && isalnum(shared_input[local_idx]))) return;

    int tcount = atomicAdd(token_count, 0);
    if (tcount >= MAX_TOKENS) return;

    EnhancedTokenGPU token;
    token.start_pos = idx;
    token.hash = 0;

    // Calculate line and column
    int line = 1, column = 1;
    for (int i = 0; i < idx; i++) {
        if (input[i] == '\n') {
            line++;
            column = 1;
        } else {
            column++;
        }
    }
    token.line = line;
    token.column = column;

    // Enhanced pattern matching
    if (isalpha(shared_input[local_idx]) || shared_input[local_idx] == '_') {
        // Handle identifiers and keywords
        int end = local_idx;
        while (end < 1024 && (isalnum(shared_input[end]) || shared_input[end] == '_')) {
            token.hash = token.hash * 31 + shared_input[end];
            end++;
        }
        token.type = TOKEN_IDENTIFIER;
        token.end_pos = idx + (end - local_idx) - 1;
        token.length = end - local_idx;
    }
    // ... Add more token pattern matching ...

    // Store token if valid
    if (token.length > 0) {
        int new_count = atomicAdd(token_count, 1);
        if (new_count < MAX_TOKENS) {
            tokens[new_count] = token;
        }
    }
}

__global__ void tokenize_kernel(const char* input, size_t input_length, TokenGPU* tokens, int* token_count) {
    int idx = blockIdx.x * blockDim.x + threadIdx.x;
    if (idx >= input_length) return;

    // Skip if not at token boundary
    if (idx > 0 && (isalnum(input[idx-1]) && isalnum(input[idx]))) return;

    int tcount = *token_count;
    if (tcount >= MAX_TOKENS) return;

    if (isalpha(input[idx])) {
        int end = idx;
        while (end < input_length && isalnum(input[end])) end++;
        int new_count = atomicAdd(token_count, 1);
        if (new_count < MAX_TOKENS) {
            tokens[new_count].type = 0;
            tokens[new_count].start_pos = idx;
            tokens[new_count].end_pos = end - 1;
            tokens[new_count].length = end - idx;
        }
    } else if (isdigit(input[idx])) {
        int end = idx;
        while (end < input_length && isdigit(input[end])) end++;
        int new_count = atomicAdd(token_count, 1);
        if (new_count < MAX_TOKENS) {
            tokens[new_count].type = 1;
            tokens[new_count].start_pos = idx;
            tokens[new_count].end_pos = end - 1;
            tokens[new_count].length = end - idx;
        }
    } else if (input[idx] == '+' || input[idx] == '-' || input[idx] == '*' || input[idx] == '/') {
        int new_count = atomicAdd(token_count, 1);
        if (new_count < MAX_TOKENS) {
            tokens[new_count].type = 2;
            tokens[new_count].start_pos = idx;
            tokens[new_count].end_pos = idx;
            tokens[new_count].length = 1;
        }
    }
}

__global__ void matrix_mult_kernel(float* a, float* b, float* c, int m, int n, int k) {
    int row = blockIdx.y * blockDim.y + threadIdx.y;
    int col = blockIdx.x * blockDim.x + threadIdx.x;
    if (row < m && col < n) {
        float sum = 0.0f;
        for (int i = 0; i < k; i++) {
            sum += a[row * k + i] * b[i * n + col];
        }
        c[row * n + col] = sum;
    }
}

// Add parallel matrix operations
__global__ void enhanced_matrix_mult_kernel(float* a, float* b, float* c,
                                          int m, int n, int k,
                                          bool use_shared_memory) {
    // ... existing matrix multiplication code ...

    // Add shared memory optimization
    __shared__ float shared_a[16][16];
    __shared__ float shared_b[16][16];

    // ... implement block matrix multiplication ...
}

// Add new CUDA utilities
void initialize_cuda_context(void) {
    cudaFree(0); // Force context initialization
}

void optimize_kernel_launch(dim3* blocks, dim3* threads, size_t shared_memory_size) {
    int device;
    cudaGetDevice(&device);
    cudaDeviceProp props;
    cudaGetDeviceProperties(&props, device);

    // Optimize launch configuration based on device properties
    // ... implementation ...
}

void cuda_tokenize(const char* input, TokenGPU* tokens, int* token_count) {
    size_t input_length = strlen(input);
    char* d_input;
    TokenGPU* d_tokens;
    int* d_token_count;

    cudaMalloc(&d_input, input_length + 1);
    cudaMalloc(&d_tokens, MAX_TOKENS * sizeof(TokenGPU));
    cudaMalloc(&d_token_count, sizeof(int));
    cudaMemcpy(d_input, input, input_length + 1, cudaMemcpyHostToDevice);
    cudaMemset(d_token_count, 0, sizeof(int));

    int threads = 256;
    int blocks = (input_length + threads - 1) / threads;
    tokenize_kernel<<<blocks, threads>>>(d_input, input_length, d_tokens, d_token_count);

    cudaMemcpy(token_count, d_token_count, sizeof(int), cudaMemcpyDeviceToHost);
    cudaMemcpy(tokens, d_tokens, *token_count * sizeof(TokenGPU), cudaMemcpyDeviceToHost);

    cudaFree(d_input);
    cudaFree(d_tokens);
    cudaFree(d_token_count);
}

void cuda_matrix_mult(float* a, float* b, float* c, int m, int n, int k) {
    float *d_a, *d_b, *d_c;
    cudaMalloc(&d_a, m * k * sizeof(float));
    cudaMalloc(&d_b, k * n * sizeof(float));
    cudaMalloc(&d_c, m * n * sizeof(float));
    cudaMemcpy(d_a, a, m * k * sizeof(float), cudaMemcpyHostToDevice);
    cudaMemcpy(d_b, b, k * n * sizeof(float), cudaMemcpyHostToDevice);

    dim3 threads(16, 16);
    dim3 blocks((n + threads.x - 1) / threads.x, (m + threads.y - 1) / threads.y);
    matrix_mult_kernel<<<blocks, threads>>>(d_a, d_b, d_c, m, n, k);

    cudaMemcpy(c, d_c, m * n * sizeof(float), cudaMemcpyDeviceToHost);
    cudaFree(d_a); cudaFree(d_b); cudaFree(d_c);
}
void print_tokens(TokenGPU* tokens, int token_count) {
    for (int i = 0; i < token_count; i++) {
        printf("Token %d: Type %d, Start %d, End %d, Length %d\n",
               i, tokens[i].type, tokens[i].start_pos, tokens[i].end_pos, tokens[i].length);
    }
}
int main() {
    const char* input = "int a = 5 + 3;";
    TokenGPU tokens[MAX_TOKENS];
    int token_count;

    cuda_tokenize(input, tokens, &token_count);
    print_tokens(tokens, token_count);

    float a[6] = {1, 2, 3, 4, 5, 6};
    float b[6] = {7, 8, 9, 10, 11, 12};
    float c[4] = {0};

    cuda_matrix_mult(a, b, c, 2, 3, 2);
    for (int i = 0; i < 4; i++) {
        printf("%f ", c[i]);
    }
    printf("\n");

    return 0;
}
// Compile with nvcc -o kernel kernel.cu