#include "cache.h"
#include "config.h"
#include "run-command.h"
#include "quote.h"
#include "version.h"
#include "trace2/tr2_dst.h"
#include "trace2/tr2_tbuf.h"
#include "trace2/tr2_tgt.h"
#include "trace2/tr2_tls.h"

static struct tr2_dst tr2dst_normal = { "GIT_TR2", 0, 0, 0 };

/*
 * Set this environment variable to true to omit the "<time> <file>:<line>"
 * fields from each line written to the builtin normal target.
 *
 * Unit tests may want to use this to help with testing.
 */
#define TR2_ENVVAR_NORMAL_BRIEF "GIT_TR2_BRIEF"
static int tr2env_normal_brief;

#define TR2FMT_NORMAL_FL_WIDTH (50)

static int fn_init(void)
{
        int want = tr2_dst_trace_want(&tr2dst_normal);
        int want_brief;
        char *brief;

        if (!want)
                return want;

        brief = getenv(TR2_ENVVAR_NORMAL_BRIEF);
        if (brief && *brief &&
            ((want_brief = git_parse_maybe_bool(brief)) != -1))
                tr2env_normal_brief = want_brief;

        return want;
}

static void fn_term(void)
{
        tr2_dst_trace_disable(&tr2dst_normal);
}

static void normal_fmt_prepare(const char *file, int line, struct strbuf *buf)
{
        strbuf_setlen(buf, 0);

        if (!tr2env_normal_brief) {
                struct tr2_tbuf tb_now;

                tr2_tbuf_local_time(&tb_now);
                strbuf_addstr(buf, tb_now.buf);
                strbuf_addch(buf, ' ');

                if (file && *file)
                        strbuf_addf(buf, "%s:%d ", file, line);
                while (buf->len < TR2FMT_NORMAL_FL_WIDTH)
                        strbuf_addch(buf, ' ');
        }
}

static void normal_io_write_fl(const char *file, int line,
                               const struct strbuf *buf_payload)
{
        struct strbuf buf_line = STRBUF_INIT;

        normal_fmt_prepare(file, line, &buf_line);
        strbuf_addbuf(&buf_line, buf_payload);
        tr2_dst_write_line(&tr2dst_normal, &buf_line);
        strbuf_release(&buf_line);
}

static void fn_version_fl(const char *file, int line)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "version %s", git_version_string);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_start_fl(const char *file, int line, const char **argv)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addstr(&buf_payload, "start ");
        sq_quote_argv_pretty(&buf_payload, argv);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_exit_fl(const char *file, int line, uint64_t us_elapsed_absolute,
                       int code)
{
        struct strbuf buf_payload = STRBUF_INIT;
        double elapsed = (double)us_elapsed_absolute / 1000000.0;

        strbuf_addf(&buf_payload, "exit elapsed:%.6f code:%d", elapsed, code);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_signal(uint64_t us_elapsed_absolute, int signo)
{
        struct strbuf buf_payload = STRBUF_INIT;
        double elapsed = (double)us_elapsed_absolute / 1000000.0;

        strbuf_addf(&buf_payload, "signal elapsed:%.6f code:%d", elapsed,
                    signo);
        normal_io_write_fl(__FILE__, __LINE__, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_atexit(uint64_t us_elapsed_absolute, int code)
{
        struct strbuf buf_payload = STRBUF_INIT;
        double elapsed = (double)us_elapsed_absolute / 1000000.0;

        strbuf_addf(&buf_payload, "atexit elapsed:%.6f code:%d", elapsed, code);
        normal_io_write_fl(__FILE__, __LINE__, &buf_payload);
        strbuf_release(&buf_payload);
}

static void maybe_append_string_va(struct strbuf *buf, const char *fmt,
                                   va_list ap)
{
        if (fmt && *fmt) {
                va_list copy_ap;

                va_copy(copy_ap, ap);
                strbuf_vaddf(buf, fmt, copy_ap);
                va_end(copy_ap);
                return;
        }

        if (fmt && *fmt) {
                strbuf_addstr(buf, fmt);
                return;
        }
}

static void fn_error_va_fl(const char *file, int line, const char *fmt,
                           va_list ap)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addstr(&buf_payload, "error ");
        maybe_append_string_va(&buf_payload, fmt, ap);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_command_path_fl(const char *file, int line, const char *pathname)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "cmd_path %s", pathname);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_command_name_fl(const char *file, int line, const char *name,
                               const char *hierarchy)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "cmd_name %s", name);
        if (hierarchy && *hierarchy)
                strbuf_addf(&buf_payload, " (%s)", hierarchy);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_command_mode_fl(const char *file, int line, const char *mode)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "cmd_mode %s", mode);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_alias_fl(const char *file, int line, const char *alias,
                        const char **argv)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "alias %s ->", alias);
        sq_quote_argv_pretty(&buf_payload, argv);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_child_start_fl(const char *file, int line,
                              uint64_t us_elapsed_absolute,
                              const struct child_process *cmd)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "child_start[%d] ", cmd->trace2_child_id);

        if (cmd->dir) {
                strbuf_addstr(&buf_payload, " cd");
                sq_quote_buf_pretty(&buf_payload, cmd->dir);
                strbuf_addstr(&buf_payload, "; ");
        }

        /*
         * TODO if (cmd->env) { Consider dumping changes to environment. }
         * See trace_add_env() in run-command.c as used by original trace.c
         */

        if (cmd->git_cmd)
                strbuf_addstr(&buf_payload, "git");
        sq_quote_argv_pretty(&buf_payload, cmd->argv);

        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_child_exit_fl(const char *file, int line,
                             uint64_t us_elapsed_absolute, int cid, int pid,
                             int code, uint64_t us_elapsed_child)
{
        struct strbuf buf_payload = STRBUF_INIT;
        double elapsed = (double)us_elapsed_child / 1000000.0;

        strbuf_addf(&buf_payload, "child_exit[%d] pid:%d code:%d elapsed:%.6f",
                    cid, pid, code, elapsed);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_exec_fl(const char *file, int line, uint64_t us_elapsed_absolute,
                       int exec_id, const char *exe, const char **argv)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "exec[%d] ", exec_id);
        if (exe)
                strbuf_addstr(&buf_payload, exe);
        sq_quote_argv_pretty(&buf_payload, argv);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_exec_result_fl(const char *file, int line,
                              uint64_t us_elapsed_absolute, int exec_id,
                              int code)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "exec_result[%d] code:%d", exec_id, code);
        if (code > 0)
                strbuf_addf(&buf_payload, " err:%s", strerror(code));
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_param_fl(const char *file, int line, const char *param,
                        const char *value)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addf(&buf_payload, "def_param %s=%s", param, value);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_repo_fl(const char *file, int line,
                       const struct repository *repo)
{
        struct strbuf buf_payload = STRBUF_INIT;

        strbuf_addstr(&buf_payload, "worktree ");
        sq_quote_buf_pretty(&buf_payload, repo->worktree);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

static void fn_printf_va_fl(const char *file, int line,
                            uint64_t us_elapsed_absolute, const char *fmt,
                            va_list ap)
{
        struct strbuf buf_payload = STRBUF_INIT;

        maybe_append_string_va(&buf_payload, fmt, ap);
        normal_io_write_fl(file, line, &buf_payload);
        strbuf_release(&buf_payload);
}

struct tr2_tgt tr2_tgt_normal = {
        &tr2dst_normal,

        fn_init,
        fn_term,

        fn_version_fl,
        fn_start_fl,
        fn_exit_fl,
        fn_signal,
        fn_atexit,
        fn_error_va_fl,
        fn_command_path_fl,
        fn_command_name_fl,
        fn_command_mode_fl,
        fn_alias_fl,
        fn_child_start_fl,
        fn_child_exit_fl,
        NULL, /* thread_start */
        NULL, /* thread_exit */
        fn_exec_fl,
        fn_exec_result_fl,
        fn_param_fl,
        fn_repo_fl,
        NULL, /* region_enter */
        NULL, /* region_leave */
        NULL, /* data */
        NULL, /* data_json */
        fn_printf_va_fl,
};