#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "proto/ipc_proto.h"

#define SOCKET_PATH "/tmp/zvfs.sock"
#define BUF_SIZE 4096

int connect_to_server() {
    int fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (fd < 0) {
        perror("socket");
        return -1;
    }

    struct sockaddr_un addr;
    memset(&addr, 0, sizeof(addr));
    addr.sun_family = AF_UNIX;
    strncpy(addr.sun_path, SOCKET_PATH, sizeof(addr.sun_path)-1);

    if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
        perror("connect");
        close(fd);
        return -1;
    }

    return fd;
}

// -------------------- 操作函数 --------------------

void do_create(int fd) {
    struct zvfs_req req;
    memset(&req, 0, sizeof(req));
    req.opcode = ZVFS_OP_CREATE;
    req.size_hint = 1024; // 1KB

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }

    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp, 0, sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received CREATE response: status=%d, blob_id=%lu, handle_id=%lu\n",
           resp.status, resp.blob_id, resp.handle_id);

    if(resp.data) free(resp.data);
}

void do_open(int fd, uint64_t blob_id) {
    struct zvfs_req req;
    memset(&req,0,sizeof(req));
    req.opcode = ZVFS_OP_OPEN;
    req.blob_id = blob_id;

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }

    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp,0,sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received OPEN response: status=%d, handle_id=%lu, size=%lu\n",
           resp.status, resp.handle_id, resp.size);

    if(resp.data) free(resp.data);
}

void do_read(int fd, uint64_t handle_id, uint64_t offset, uint64_t length) {
    struct zvfs_req req;
    memset(&req,0,sizeof(req));
    req.opcode = ZVFS_OP_READ;
    req.handle_id = handle_id;
    req.offset = offset;
    req.length = length;

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }

    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp,0,sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received READ response: status=%d, length=%lu\n",
           resp.status, resp.length);

    if(resp.data) {
        printf("Data: ");
        for(size_t i=0;i<resp.length;i++)
            printf("%02x ", ((uint8_t*)resp.data)[i]);
        printf("\n");
        free(resp.data);
    }
}

void do_write(int fd, uint64_t handle_id, uint64_t offset,
              const char *data, size_t len, uint32_t write_flags) {
    struct zvfs_req req;
    memset(&req,0,sizeof(req));
    req.opcode = ZVFS_OP_WRITE;
    req.handle_id = handle_id;
    req.offset = offset;
    req.length = len;
    req.write_flags = write_flags;
    req.data = (void*)data;

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }

    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp,0,sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received WRITE response: status=%d, bytes_written=%lu\n",
           resp.status, resp.bytes_written);

    if(resp.data) free(resp.data);
}

void do_close(int fd, uint64_t handle_id) {
    struct zvfs_req req;
    memset(&req,0,sizeof(req));
    req.opcode = ZVFS_OP_CLOSE;
    req.handle_id = handle_id;

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }
    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp,0,sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received CLOSE response: status=%d\n", resp.status);
    if(resp.data) free(resp.data);
}

void do_delete(int fd, uint64_t blob_id) {
    struct zvfs_req req;
    memset(&req,0,sizeof(req));
    req.opcode = ZVFS_OP_DELETE;
    req.blob_id = blob_id;

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }
    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp,0,sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received DELETE response: status=%d\n", resp.status);
    if(resp.data) free(resp.data);
}

void do_resize(int fd, uint64_t handle_id, uint64_t new_size) {
    struct zvfs_req req;
    memset(&req,0,sizeof(req));
    req.opcode = ZVFS_OP_RESIZE;
    req.handle_id = handle_id;
    req.size_hint = new_size;

    uint8_t buf[BUF_SIZE];
    size_t n = zvfs_serialize_req(&req, buf, sizeof(buf));
    if (n == 0) { fprintf(stderr,"serialize failed\n"); return; }
    if (write(fd, buf, n) != n) { perror("write"); return; }

    uint8_t resp_buf[BUF_SIZE];
    ssize_t r = read(fd, resp_buf, sizeof(resp_buf));
    if (r <= 0) { perror("read"); return; }

    struct zvfs_resp resp;
    memset(&resp,0,sizeof(resp));
    size_t consumed = zvfs_deserialize_resp(resp_buf, r, &resp);
    if (consumed == 0) { fprintf(stderr, "deserialize failed\n"); return; }

    printf("Received RESIZE response: status=%d\n", resp.status);
    if(resp.data) free(resp.data);
}

// -------------------- main --------------------

int main() {
    int fd = connect_to_server();
    if(fd < 0) return 1;

    printf("Connected to server at %s\n", SOCKET_PATH);
    printf("Commands:\n create\n open <blob>\n read <handle> <offset> <len>\n write <handle> <offset> <data>\n writeg <handle> <offset> <data>\n close <handle>\n delete <blob>\n resize <handle> <size>\n quit\n");

    char line[256];
    while (1) {
        printf("> ");
        if(!fgets(line, sizeof(line), stdin)) break;

        char cmd[32];
        uint64_t a,b,c;
        char data[128];

        if (sscanf(line, "%31s", cmd) != 1) continue;

        if (strcmp(cmd,"quit")==0) break;
        else if (strcmp(cmd,"create")==0) do_create(fd);
        else if (strcmp(cmd,"open")==0 && sscanf(line,"%*s %lu",&a)==1) do_open(fd,a);
        else if (strcmp(cmd,"read")==0 && sscanf(line,"%*s %lu %lu %lu",&a,&b,&c)==3) do_read(fd,a,b,c);
        else if (strcmp(cmd,"write")==0 && sscanf(line,"%*s %lu %lu %127s",&a,&b,data)==3)
            do_write(fd, a, b, data, strlen(data), 0);
        else if (strcmp(cmd,"writeg")==0 && sscanf(line,"%*s %lu %lu %127s",&a,&b,data)==3)
            do_write(fd, a, b, data, strlen(data), ZVFS_WRITE_F_AUTO_GROW);
        else if (strcmp(cmd,"close")==0 && sscanf(line,"%*s %lu",&a)==1) do_close(fd,a);
        else if (strcmp(cmd,"delete")==0 && sscanf(line,"%*s %lu",&a)==1) do_delete(fd,a);
        else if (strcmp(cmd,"resize")==0 && sscanf(line,"%*s %lu %lu",&a,&b)==2) do_resize(fd,a,b);
        else printf("Unknown or invalid command\n");
    }

    close(fd);
    return 0;
}