#!/bin/bash

show_help() {
  echo "Usage: $0 [--mods-names|-m mods] [--include-default-mods|-d true] [--interactive-mode|-i true]"
  echo "Options:"
  echo "  --mods-names|-m                   (required) Specify mods names list, separation by comma (,)."
  echo "                                               Run \"--use-ids true\" to use ids instead of names for mod installations"
  echo "  --include-default-mods|-d         (optional) Includes a list of default mods."
  echo "                                               Run \"--list-default-mods true\" to list the default mods."
  echo "  --interactive-mode|-i             (optional) The script will ask for installation for each mod and show warnings."
}

if ! test -f modlist.json; then
  echo "This script uses the mmm (meza/minecraft-mod-manager) tool to detect and install mods."
  echo "Please ensure that you are inside a .minecraft folder that contains an initialized mmm setup."
  echo "mmm's GitHub repository: https://github.com/meza/minecraft-mod-manager"
  exit 1
fi

modsnames_csv=''
use_ids=false
should_include_default_mods=false
list_default_mods=false
interactive_mode=false

while [ "$#" -gt 0 ]; do
  case "$1" in
    --help|-h) show_help; exit ;;
    --mods-names|-m) modsnames_csv="$2"; shift 2 ;;
    --use-ids) use_ids=true; shift 2 ;;
    --include-default-mods|-d) should_include_default_mods=true; shift 2 ;;
    --list-default-mods) list_default_mods=true; shift 2 ;;
    --interactive-mode|-i) interactive_mode=true; shift 2 ;;
    *) shift ;;
  esac
done

default_mods_ids=(
  "P7dR8mSH", # Fabric API
)

if $list_default_mods; then
  echo "Default mods to be installed:"
  for mod_id in ${default_mods_ids[@]}; do
    mod_title=(http --verify no "https://api.modrinth.com/v2/project/$mod_id" | jq -r ".title")
    mod_url="https://modrinth.com/mod/$mod_id"

    echo "    $mod_title: $mod_url"
  done
fi

if $should_include_default_mods; then
  for mod_id in ${default_mods_ids[@]}; do
    mmm add modrinth $mod_id
  done
fi

modsnames=()

while [ -z "$modsnames_csv" ]; do 
  echo "Enter mods list, separation by comma (,)"
  read modsnames_csv
done

modsnames+=(${modsnames_csv//,/ })

resource_packs=()
skipped_mods=()

mods_length="${#modsnames[@]}"

for (( i=0; i<${mods_length}; i++ )); do
  mod=${modsnames[$i]}

  clear

  echo "Doing \"$mod\" now... ($((i+1))/$((mods_length+1)))"
  
  if $use_ids; then
    echo "yes n | mmm add modrinth $mod"

    if [ $? -ne 0 ]; then
      skipped_mods+=($mod)
    fi

    continue
  fi

  req_output=`http --verify no "https://api.modrinth.com/v2/search?query=$mod&index=relevance"`
  echo $req_output | jq empty

  if [ $? -ne 0 ]; then
    if $interactive_mode; then
      echo "The query for mod \"$mod\" resulted in a invalid JSON response."

      mod_search_url=${mod// /+}
      echo "Please search for it manually: https://modrinth.com/mods?q=$mod_search_url"
      echo "Press any key to continue..."
      read
      continue
    fi

    skipped_mods+=($mod)
  fi

  mod_search_hits=$(jq -r '.hits' <<< "$req_output")
  mod_search_count=$(jq length <<< "$mod_search_hits")

  mod_id_selected=''

  should_install_mod=false
  should_skip_mod=false
  should_continue_matches=false

  if [ $mod_search_count -eq 0 ]; then
    skipped_mods+=($mod)
    continue
  fi

  for ((j=0; j < mod_search_count; j++)); do
    mod_search_hit=$(jq -r ".[$j]" <<< "$mod_search_hits")

    mod_id=$(jq -r ".project_id" <<< "$mod_search_hit")
    mod_slug=$(jq -r ".slug" <<< "$mod_search_hit")
    mod_project_type=$(jq -r ".project_type" <<< "$mod_search_hit")

    if $interactive_mode; then
      echo "We found a match for the \"$mod\" mod! ($((j+1))/$((mod_search_count+1)))"
      echo ""

      mod_url="https://modrinth.com/mod/${mod_id// /+}"

      echo "Mod's URL: $mod_url"
      echo ""

      echo "Mod's info:"
      echo "$mod_search_hit" | jq

      echo ""
    fi

    if [ $mod_project_type == "resourcepack" ]; then
      if $interactive_mode; then
        echo ""
        echo "The found match relates to a resource pack instead of a mod."
        echo "Please input 'yes' if you want the script to remind you to install the resource pack separately and skip to the next mod."
        echo "Please input 'no' if you want the script to continue looking for more matches for the mod."

        while true; do
          read -p "Please answer: (y/n): " yn

          case $yn in
            [Yy]* ) resource_packs+=($mod); should_skip_mod=true; break;;
            [Nn]* ) clear; should_continue_matches=true; echo "Looking for more matches..."; sleep 1; echo ""; break;;
            * ) echo "Please answer yes or no."; echo "";;
          esac
        done
      fi

      resource_packs+=($mod)
      should_continue_matches=true
    fi

    if [ $mod_project_type != "mod" ]; then
      if $interactive_mode; then
        echo ""
        echo "The found match relates to project type that is not a mod (\"$mod_project_type\")."
        echo "Please input 'yes' if you want the script to remind you to install the project separately and skip to the next mod."
        echo "Please input 'no' if you want the script to continue looking for more matches for the mod."

        while true; do
          read -p "Please answer: (y/n): " yn

          case $yn in
            [Yy]* ) resource_packs+=($mod); should_skip_mod=true; break;;
            [Nn]* ) clear; should_continue_matches=true; echo "Looking for more matches..."; sleep 1; echo ""; break;;
            * ) echo "Please answer yes or no."; echo "";;
          esac
        done
      fi

      should_continue_matches=true
    fi

    if $should_continue_matches; then
      should_continue_matches=false
      clear
      continue
    fi

    if $should_skip_mod; then
      break
    fi

    should_install_mod=true

    if $interactive_mode; then
      while true; do
        read -p "Does this look right? (y/n/c): " yn

        case $yn in
          [Yy]* ) should_install_mod=true; break;;
          [Nn]* ) clear; echo "Looking for more matches..."; sleep 1; echo ""; break;;
          [Cc]* ) should_skip_mod=true; break;;
          * ) echo "Please answer yes, no or cancel."; echo "";;
        esac
      done
    fi

    if $should_skip_mod; then
      skipped_mods+=($mod)
    fi

    if $should_install_mod || $should_skip_mod; then
      break
    fi
  done

  if $should_install_mod; then
    clear

    grep --quiet $mod_slug modlist.json

    if [ $? -eq 0 ]; then
      if $interactive_mode; then
        echo "The selected mod is already installed."
        echo "Skipping..."
        echo "Press any key to continue..."
        read
      fi

      continue
    fi

    if $interactive_mode; then
      echo "The following mod will be intalled: \"$mod_slug\""
    fi

    echo "yes n | mmm add modrinth $mod_id"
    read

    if [ $? -ne 0 ]; then
      skipped_mods+=($mod)

      if $interactive_mode; then
        echo ""
        echo "It seems that the mod installation was not successful."
        echo "The script will log this mod as not installed after all mods are processed."
        echo "Press any key to continue..."
        read
        continue
      fi
    fi
  fi

  if $should_skip_mod; then
    continue
  fi

  if [ -z "$mod_info_selected" ]; then
    skipped_mods+=($mod)

    if $interactive_mode; then
      echo ""
      echo "No match was selected for installation."
      echo "The mod \"$mod\" wasn't installed by the script."
      echo "This will be logged when all mods are finished."
      echo "Press any key to continue..."
      read
    fi
  fi
done

if (( ${#resource_packs[@]} )); then
  echo ""
  echo "[INFO] There were resource packs found:"

  for r in ${resource_packs[@]}; do
    echo "    $r"
  done
fi

if (( ${#skipped_mods[@]} )); then
  echo ""
  echo "[INFO] There were mods that had their installations skipped:"

  for mod in ${skipped_mods[@]}; do
    echo "    $mod"
  done
fi