#include <stdio.h>
#include <sys/utsname.h>
#include "common.h"
#include "../util/debug.h"

const char *const arm_triplets[] = {
        "arm-eabi-",
        "arm-linux-androideabi-",
        "arm-unknown-linux-",
        "arm-unknown-linux-gnu-",
        "arm-unknown-linux-gnueabi-",
        NULL
};

const char *const powerpc_triplets[] = {
        "powerpc-unknown-linux-gnu-",
        "powerpc64-unknown-linux-gnu-",
        NULL
};

const char *const s390_triplets[] = {
        "s390-ibm-linux-",
        NULL
};

const char *const sh_triplets[] = {
        "sh-unknown-linux-gnu-",
        "sh64-unknown-linux-gnu-",
        NULL
};

const char *const sparc_triplets[] = {
        "sparc-unknown-linux-gnu-",
        "sparc64-unknown-linux-gnu-",
        NULL
};

const char *const x86_triplets[] = {
        "x86_64-pc-linux-gnu-",
        "x86_64-unknown-linux-gnu-",
        "i686-pc-linux-gnu-",
        "i586-pc-linux-gnu-",
        "i486-pc-linux-gnu-",
        "i386-pc-linux-gnu-",
        "i686-linux-android-",
        "i686-android-linux-",
        NULL
};

const char *const mips_triplets[] = {
        "mips-unknown-linux-gnu-",
        "mipsel-linux-android-",
        NULL
};

static bool lookup_path(char *name)
{
        bool found = false;
        char *path, *tmp;
        char buf[PATH_MAX];
        char *env = getenv("PATH");

        if (!env)
                return false;

        env = strdup(env);
        if (!env)
                return false;

        path = strtok_r(env, ":", &tmp);
        while (path) {
                scnprintf(buf, sizeof(buf), "%s/%s", path, name);
                if (access(buf, F_OK) == 0) {
                        found = true;
                        break;
                }
                path = strtok_r(NULL, ":", &tmp);
        }
        free(env);
        return found;
}

static int lookup_triplets(const char *const *triplets, const char *name)
{
        int i;
        char buf[PATH_MAX];

        for (i = 0; triplets[i] != NULL; i++) {
                scnprintf(buf, sizeof(buf), "%s%s", triplets[i], name);
                if (lookup_path(buf))
                        return i;
        }
        return -1;
}

/*
 * Return architecture name in a normalized form.
 * The conversion logic comes from the Makefile.
 */
static const char *normalize_arch(char *arch)
{
        if (!strcmp(arch, "x86_64"))
                return "x86";
        if (arch[0] == 'i' && arch[2] == '8' && arch[3] == '6')
                return "x86";
        if (!strcmp(arch, "sun4u") || !strncmp(arch, "sparc", 5))
                return "sparc";
        if (!strncmp(arch, "arm", 3) || !strcmp(arch, "sa110"))
                return "arm";
        if (!strncmp(arch, "s390", 4))
                return "s390";
        if (!strncmp(arch, "parisc", 6))
                return "parisc";
        if (!strncmp(arch, "powerpc", 7) || !strncmp(arch, "ppc", 3))
                return "powerpc";
        if (!strncmp(arch, "mips", 4))
                return "mips";
        if (!strncmp(arch, "sh", 2) && isdigit(arch[2]))
                return "sh";

        return arch;
}

static int perf_session_env__lookup_binutils_path(struct perf_session_env *env,
                                                  const char *name,
                                                  const char **path)
{
        int idx;
        const char *arch, *cross_env;
        struct utsname uts;
        const char *const *path_list;
        char *buf = NULL;

        arch = normalize_arch(env->arch);

        if (uname(&uts) < 0)
                goto out;

        /*
         * We don't need to try to find objdump path for native system.
         * Just use default binutils path (e.g.: "objdump").
         */
        if (!strcmp(normalize_arch(uts.machine), arch))
                goto out;

        cross_env = getenv("CROSS_COMPILE");
        if (cross_env) {
                if (asprintf(&buf, "%s%s", cross_env, name) < 0)
                        goto out_error;
                if (buf[0] == '/') {
                        if (access(buf, F_OK) == 0)
                                goto out;
                        goto out_error;
                }
                if (lookup_path(buf))
                        goto out;
                free(buf);
                buf = NULL;
        }

        if (!strcmp(arch, "arm"))
                path_list = arm_triplets;
        else if (!strcmp(arch, "powerpc"))
                path_list = powerpc_triplets;
        else if (!strcmp(arch, "sh"))
                path_list = sh_triplets;
        else if (!strcmp(arch, "s390"))
                path_list = s390_triplets;
        else if (!strcmp(arch, "sparc"))
                path_list = sparc_triplets;
        else if (!strcmp(arch, "x86"))
                path_list = x86_triplets;
        else if (!strcmp(arch, "mips"))
                path_list = mips_triplets;
        else {
                ui__error("binutils for %s not supported.\n", arch);
                goto out_error;
        }

        idx = lookup_triplets(path_list, name);
        if (idx < 0) {
                ui__error("Please install %s for %s.\n"
                          "You can add it to PATH, set CROSS_COMPILE or "
                          "override the default using --%s.\n",
                          name, arch, name);
                goto out_error;
        }

        if (asprintf(&buf, "%s%s", path_list[idx], name) < 0)
                goto out_error;

out:
        *path = buf;
        return 0;
out_error:
        free(buf);
        *path = NULL;
        return -1;
}

int perf_session_env__lookup_objdump(struct perf_session_env *env)
{
        /*
         * For live mode, env->arch will be NULL and we can use
         * the native objdump tool.
         */
        if (env->arch == NULL)
                return 0;

        return perf_session_env__lookup_binutils_path(env, "objdump",
                                                      &objdump_path);
}