/* add.c - the add action ----------------------------------------------*- C -*-
 *
 * This file is part of ck, the config keeper
 *
 * -----------------------------------------------------------------------------
 *
 * Copyright (C) 2019  Anastasis Grammenos
 * GPLv3 (see LICENCE for the full notice)
 *
 * -------------------------------------------------------------------------- */
#include <libgen.h>

#include "dblayer.h"
#include "ckerrlog.h"

ERRLOG(add);

static int get_next_valid_id_from_table(DB *db, const char* tableName) {
  sqlite3_stmt *stmt;
  int rc;

  char sql[STR_M] = "";
  dbh_fq_select_id_from(sql, tableName);

  rc = sqlite3_prepare_v2(db->ptr, sql, -1, &stmt, 0);
  if (rc != SQLITE_OK) {
    return -1;
  }
  sqlite3_bind_text(stmt, 1, tableName, (int)strlen(tableName), 0);

  int id = 0;
  while (sqlite3_step(stmt) == SQLITE_ROW) {
    int a = sqlite3_column_int(stmt, 0);
    if (a != id) {
      break;
    }
    id++;
  }
  sqlite3_finalize(stmt);
  return id;
}

static int insert_to_program_table(DB *db, const char *name) {
  sqlite3_stmt *stmt;
  int rc;

  char sql[STR_L] = "";
  dbh_fq_insert_program(sql);

  rc = sqlite3_prepare_v2(db->ptr, sql, -1, &stmt, 0);
  if (rc != SQLITE_OK) {
    ERR("while preparing insert to program sql.");
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  int id = get_next_valid_id_from_table(db, TBL_PROGRAM);
  if (id == -1) {
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  sqlite3_bind_int(stmt, 1, id);
  sqlite3_bind_text(stmt, 2, name, (int)strlen(name), 0);
  if (sqlite3_step(stmt) != SQLITE_DONE) {
    ERR("while excecuting insert to program sql.");
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  sqlite3_finalize(stmt);
  return id;
}

static int insert_to_config_table(DB *db, const char *path, const int secret, const int prime) {
  sqlite3_stmt *stmt;
  int rc;

  char sql[STR_L] = "";
  dbh_fq_insert_config(sql);
  rc = sqlite3_prepare_v2(db->ptr, sql, -1, &stmt, 0);
  if (rc != SQLITE_OK) {
    ERR("Error while preparing insert to config sql.");
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  int id = get_next_valid_id_from_table(db, TBL_CONFIG);
  if (id == -1) {
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  sqlite3_bind_int(stmt, 1, id);
  sqlite3_bind_text(stmt, 2, path, (int)strlen(path), 0);
  sqlite3_bind_int(stmt, 3, secret);
  sqlite3_bind_int(stmt, 4, prime);
  if (sqlite3_step(stmt) != SQLITE_DONE) {
    ERR("Error while excecuting insert to config sql.");
    db->error = SQL_ERR_SQLITE;
    return-1;
  }
  sqlite3_finalize(stmt);
  return id;
}

static int add_get_or_insert_config_to_db(DB *db, const int pid, const char *path, const int secret, const int prime, const char *home) {
  char tpath[STR_L] = "";
  if (!swap_home_with_tilde(tpath, path, home)) {
    strcpy(tpath, path);
  }
  int cid = get_config_id(db, tpath);
  if (cid == -2) {
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  /* If config doesnt exist insert it and return it's cid */
  if (cid == -1) {
    if (program_has_primary_config(db, pid, NULL, NULL) && prime) {
      db->error = SQL_ERR_PRIMARY_REDEFINITION;
      return -1;
    }
    return insert_to_config_table(db, tpath, secret, prime);
  }

  /* If it exist it means the user has inserted the same path twice */
  db->error = SQL_CONFIG_PATH_EXISTS;
  return -1;
}

static int add_get_or_insert_program_to_db(DB *db, const char *name) {
  int pid = get_program_id(db, name);
  if (pid == -2) {
    db->error = SQL_ERR_SQLITE;
    return -1;
  }
  if (pid == -1) {
    return insert_to_program_table(db, name);
  }
  return pid;
}

static int add_basename_exists(DB *db, const char *pName, const char *path) {
  cklist *baseNames = list_make_new();
  get_program_paths(db, baseNames, pName, 1 /*basename */, 0, NULL);
  char *tmp = strdup(path);
  int rc = list_exists(baseNames, basename(tmp));
  free(tmp);
  list_free(baseNames);
  return rc;
}

static int add_insert_relationship(DB *db, const int pid, const int cid) {
  sqlite3_stmt *stmt;
  int rc;

  char sql[STR_M] = "";
  dhb_fq_insert_relationship(sql);
  rc = sqlite3_prepare_v2(db->ptr, sql, -1, &stmt, 0);
  if (rc != SQLITE_OK) {
    db->error = SQL_ERR_SQLITE;
    ERR("while preparing insert to rel sql.");
    return -1;
  }
  sqlite3_bind_int(stmt, 1, pid);
  sqlite3_bind_int(stmt, 2, cid);
  if (sqlite3_step(stmt) != SQLITE_DONE) {
    db->error = SQL_ERR_SQLITE;
    ERR("while excecuting insert to rel sql.");
    return-1;
  }
  sqlite3_finalize(stmt);
  return 1;
}

/* Returns 1 in error, 0 otherwise */
static int add_transaction_try(DB *db, const AddOpt * const opt, const char *home) {
  __BEGIN_TRANSACTION__
  int pid = add_get_or_insert_program_to_db(db, opt->progName);
  if (db->error == SQL_ERR_SQLITE) {
    ERR("Could not insert program to db.");
    return 1;
  }
  if (add_basename_exists(db, opt->progName, opt->confPath)) {
    ERR("Cannot have two configs with the same basename, for the same program.");
    return 1;
  }
  int cid = add_get_or_insert_config_to_db(db, pid, opt->confPath, opt->secret, opt->prime, home);
  if (db->error == SQL_ERR_SQLITE) {
    ERR("Could not insert config to db.");
    return 1;
  }
  else if (db->error == SQL_CONFIG_PATH_EXISTS) {
    ERR("This config already exists in the database.");
    return 1;
  }
  else if (db->error == SQL_ERR_PRIMARY_REDEFINITION) {
    ERR("This program already has a primary config.");
    return 1;
  }
  add_insert_relationship(db, pid, cid);
  if (db->error == SQL_ERR_SQLITE) {
    ERR("rel update failed\n");
    return 1;
  }
  __END_TRANSACTION__

  return 0;
}

static int link_config(const AddOpt *opt, const char* newPath) {
  hLOG("Linking %s -> %s", newPath, opt->confPath);
  if (util_symlink_file(newPath, opt->confPath) != 0) {
    ERR("Could not link file.");
    return -1;
  }
  return 0;
}

static int move_config(const AddOpt *opt, char *progDir, char *ret) {
  char newPath[STR_L] = "";
  char *tmp = strdup(opt->confPath);
  str_join_dirname_with_basename(newPath, progDir, basename(tmp));
  free(tmp);
  if (util_file_exists(newPath, NULL)) {
    ERR("File already exists");
    return -1;
  }
  strcpy(ret, newPath);
  hLOG("Moving %s -> %s", opt->confPath, newPath);
  if (util_move_file(opt->confPath, newPath) != 0) {
    ERR("Could not move file.");
    return -1;
  }
  return 0;
}

static AddOpt add_make_options(cklist *args, DB *db) {
  list_rewind(args);
  /* since we are here, the first two arguments must exist */
  AddOpt addOpt = {
    .progName = list_get(args),
    .secret = 0,
    .prime = 0,
    .err = ADD_NO_ERR
  };

  list_next(args);
  strcpy(addOpt.confPath, list_get(args));
  if (!util_is_file_rw(addOpt.confPath)) {
    addOpt.err = ADD_ERR_WRONG_CONFIG;
    return addOpt;
  }
  if (util_is_file_link(addOpt.confPath)) {
    addOpt.err = ADD_ERR_LINK_CONFIG;
    return addOpt;
  }
  realpath(list_get(args), addOpt.confPath);

  while (list_next(args)) {
    if (strcmp(list_get(args), "-s") == 0 && addOpt.secret == 0) {
      if (!secret_enabled(db)) {
        addOpt.err = ADD_ERR_NO_SECRET;
        return addOpt;
      }
      addOpt.secret = 1;
    } else if (strcmp(list_get(args), "-p") == 0 && addOpt.prime == 0) {
      addOpt.prime = 1;
    } else {
      addOpt.err = ADD_ERR_WRONG_FLAGS;
      return addOpt;
    }
  }
  list_rewind(args);
  return addOpt;
}

static void add_print_opts(AddOpt *opt) {
  printf("Program:\t%s\nConfig:\t\t%s\n", opt->progName, opt->confPath);
  if (opt->prime && opt->secret) {
    printf("Options:\tsecret, primary\n");
  } else if (opt->prime) {
    printf("Options:\tprimary\n");
  } else if (opt->secret) {
    printf("Options:\tsecret\n");
  }
}

static void get_or_make_program_dir(const AddOpt *opt, const Conf *conf, char *ret) {
  char tmp[STR_L] = "";
  str_join_dirname_with_basename(tmp, opt->secret ? conf->scrt_dir : conf->vc_dir, opt->progName);
  if (!util_file_exists(tmp, NULL)) {
    util_mkdir(tmp);
  }
  strcpy(ret, tmp);
}

static int add_make_link(const AddOpt *opt, const Conf *conf) {
  char progDir[STR_L] = "";
  get_or_make_program_dir(opt, conf, progDir);
  char newPath[STR_L] = "";
  if (move_config(opt, progDir, newPath)) {
    return -1;
  }
  if (link_config(opt, newPath)) {
    return -1;
  }
  return 0;
}

int run_ADD(UserOpt * opt, Conf *conf) {
  DB db;
  if (open_DB(&db, opt)) {
    return -1;
  }
  AddOpt addOpt = add_make_options(opt->args, &db);
  switch (addOpt.err) {
  case ADD_NO_ERR:
    break;
  case ADD_ERR_NO_SECRET:
    ERR("Secret is not enabled for this ck instance.");
    goto error;
  case ADD_ERR_LINK_CONFIG:
    ERR("%s is a link.", addOpt.confPath);
    goto error;
  case ADD_ERR_WRONG_CONFIG:
    ERR("%s doesn't exist.", addOpt.confPath);
    goto error;
  case ADD_ERR_WRONG_FLAGS:
    ERR("Flags are: -s for secret and -p for primary.");
    goto error;
  }
  add_print_opts(&addOpt);
  /* Try adding the new config to the DB */
  if (add_transaction_try(&db, &addOpt, conf->home_dir)) {
    goto error;
  }
  if (add_make_link(&addOpt, conf)) {
  error:
    close_DB(&db);
    sERR("Could not complete add transaction.");
    return -1;
  }
  close_DB(&db);
  hLOG("ckdb updated succesfully.");
  return 0;
}

void print_ADD_help() {
  HELP("ck add PROGRAM_NAME CONFIG_PATH [-p] [-s]");
}