#include "builtin.h"
#include "pkt-line.h"
#include "fetch-pack.h"
#include "remote.h"
#include "connect.h"
#include "sha1-array.h"

static const char fetch_pack_usage[] =
"git fetch-pack [--all] [--stdin] [--quiet|-q] [--keep|-k] [--thin] "
"[--include-tag] [--upload-pack=<git-upload-pack>] [--depth=<n>] "
"[--no-progress] [--diag-url] [-v] [<host>:]<directory> [<refs>...]";

static void add_sought_entry_mem(struct ref ***sought, int *nr, int *alloc,
                                 const char *name, int namelen)
{
        struct ref *ref = xcalloc(1, sizeof(*ref) + namelen + 1);
        unsigned char sha1[20];

        if (namelen > 41 && name[40] == ' ' && !get_sha1_hex(name, sha1)) {
                hashcpy(ref->old_sha1, sha1);
                name += 41;
                namelen -= 41;
        }

        memcpy(ref->name, name, namelen);
        ref->name[namelen] = '\0';
        (*nr)++;
        ALLOC_GROW(*sought, *nr, *alloc);
        (*sought)[*nr - 1] = ref;
}

static void add_sought_entry(struct ref ***sought, int *nr, int *alloc,
                             const char *string)
{
        add_sought_entry_mem(sought, nr, alloc, string, strlen(string));
}

int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
{
        int i, ret;
        struct ref *ref = NULL;
        const char *dest = NULL;
        struct ref **sought = NULL;
        int nr_sought = 0, alloc_sought = 0;
        int fd[2];
        char *pack_lockfile = NULL;
        char **pack_lockfile_ptr = NULL;
        struct child_process *conn;
        struct fetch_pack_args args;
        struct sha1_array shallow = SHA1_ARRAY_INIT;

        packet_trace_identity("fetch-pack");

        memset(&args, 0, sizeof(args));
        args.uploadpack = "git-upload-pack";

        for (i = 1; i < argc && *argv[i] == '-'; i++) {
                const char *arg = argv[i];

                if (starts_with(arg, "--upload-pack=")) {
                        args.uploadpack = arg + 14;
                        continue;
                }
                if (starts_with(arg, "--exec=")) {
                        args.uploadpack = arg + 7;
                        continue;
                }
                if (!strcmp("--quiet", arg) || !strcmp("-q", arg)) {
                        args.quiet = 1;
                        continue;
                }
                if (!strcmp("--keep", arg) || !strcmp("-k", arg)) {
                        args.lock_pack = args.keep_pack;
                        args.keep_pack = 1;
                        continue;
                }
                if (!strcmp("--thin", arg)) {
                        args.use_thin_pack = 1;
                        continue;
                }
                if (!strcmp("--include-tag", arg)) {
                        args.include_tag = 1;
                        continue;
                }
                if (!strcmp("--all", arg)) {
                        args.fetch_all = 1;
                        continue;
                }
                if (!strcmp("--stdin", arg)) {
                        args.stdin_refs = 1;
                        continue;
                }
                if (!strcmp("--diag-url", arg)) {
                        args.diag_url = 1;
                        continue;
                }
                if (!strcmp("-v", arg)) {
                        args.verbose = 1;
                        continue;
                }
                if (starts_with(arg, "--depth=")) {
                        args.depth = strtol(arg + 8, NULL, 0);
                        continue;
                }
                if (!strcmp("--no-progress", arg)) {
                        args.no_progress = 1;
                        continue;
                }
                if (!strcmp("--stateless-rpc", arg)) {
                        args.stateless_rpc = 1;
                        continue;
                }
                if (!strcmp("--lock-pack", arg)) {
                        args.lock_pack = 1;
                        pack_lockfile_ptr = &pack_lockfile;
                        continue;
                }
                if (!strcmp("--check-self-contained-and-connected", arg)) {
                        args.check_self_contained_and_connected = 1;
                        continue;
                }
                if (!strcmp("--cloning", arg)) {
                        args.cloning = 1;
                        continue;
                }
                if (!strcmp("--update-shallow", arg)) {
                        args.update_shallow = 1;
                        continue;
                }
                usage(fetch_pack_usage);
        }

        if (i < argc)
                dest = argv[i++];
        else
                usage(fetch_pack_usage);

        /*
         * Copy refs from cmdline to growable list, then append any
         * refs from the standard input:
         */
        for (; i < argc; i++)
                add_sought_entry(&sought, &nr_sought, &alloc_sought, argv[i]);
        if (args.stdin_refs) {
                if (args.stateless_rpc) {
                        /* in stateless RPC mode we use pkt-line to read
                         * from stdin, until we get a flush packet
                         */
                        for (;;) {
                                char *line = packet_read_line(0, NULL);
                                if (!line)
                                        break;
                                add_sought_entry(&sought, &nr_sought,  &alloc_sought, line);
                        }
                }
                else {
                        /* read from stdin one ref per line, until EOF */
                        struct strbuf line = STRBUF_INIT;
                        while (strbuf_getline(&line, stdin, '\n') != EOF)
                                add_sought_entry(&sought, &nr_sought, &alloc_sought, line.buf);
                        strbuf_release(&line);
                }
        }

        if (args.stateless_rpc) {
                conn = NULL;
                fd[0] = 0;
                fd[1] = 1;
        } else {
                int flags = args.verbose ? CONNECT_VERBOSE : 0;
                if (args.diag_url)
                        flags |= CONNECT_DIAG_URL;
                conn = git_connect(fd, dest, args.uploadpack,
                                   flags);
                if (!conn)
                        return args.diag_url ? 0 : 1;
        }
        get_remote_heads(fd[0], NULL, 0, &ref, 0, NULL, &shallow);

        ref = fetch_pack(&args, fd, conn, ref, dest, sought, nr_sought,
                         &shallow, pack_lockfile_ptr);
        if (pack_lockfile) {
                printf("lock %s\n", pack_lockfile);
                fflush(stdout);
        }
        if (args.check_self_contained_and_connected &&
            args.self_contained_and_connected) {
                printf("connectivity-ok\n");
                fflush(stdout);
        }
        close(fd[0]);
        close(fd[1]);
        if (finish_connect(conn))
                return 1;

        ret = !ref;

        /*
         * If the heads to pull were given, we should have consumed
         * all of them by matching the remote.  Otherwise, 'git fetch
         * remote no-such-ref' would silently succeed without issuing
         * an error.
         */
        for (i = 0; i < nr_sought; i++) {
                if (!sought[i] || sought[i]->matched)
                        continue;
                error("no such remote ref %s", sought[i]->name);
                ret = 1;
        }

        while (ref) {
                printf("%s %s\n",
                       sha1_to_hex(ref->old_sha1), ref->name);
                ref = ref->next;
        }

        return ret;
}