#!/usr/bin/env bash
# cgit installer
set -euo pipefail

CGIT_SERVER="https://git.sourcemod.lol"
CGIT_URL="${CGIT_SERVER}/api.php?a=client"

if [ -t 1 ]; then
  R='\033[0;31m' G='\033[0;32m' Y='\033[1;33m' B='\033[0;34m' BOLD='\033[1m' NC='\033[0m'
else
  R='' G='' Y='' B='' BOLD='' NC=''
fi

ok()   { printf "${G}✓${NC} %s\n" "$*"; }
info() { printf "${B}→${NC} %s\n" "$*"; }
warn() { printf "${Y}!${NC} %s\n" "$*"; }
die()  { printf "${R}✗ %s${NC}\n" "$*" >&2; exit 1; }

# ── Detect platform ───────────────────────────────────────────────────────────
PLATFORM="linux"
if [[ "${MSYSTEM:-}" == MINGW* || "${MSYSTEM:-}" == MSYS* || \
      "${OSTYPE:-}" == "msys"   || "${OSTYPE:-}" == "cygwin" ]]; then
  PLATFORM="gitbash"
elif [[ "${OSTYPE:-}" == "darwin"* ]]; then
  PLATFORM="mac"
elif grep -qi microsoft /proc/version 2>/dev/null; then
  PLATFORM="wsl"
fi

declare -A PLATFORM_NAMES=(["gitbash"]="Windows (Git Bash)" ["wsl"]="Windows (WSL)" ["mac"]="macOS" ["linux"]="Linux")
printf "\n${BOLD}cgit installer${NC}  ·  %s\n\n" "${PLATFORM_NAMES[$PLATFORM]}"

# ── Requirements ──────────────────────────────────────────────────────────────
info "Checking requirements..."

[[ "${BASH_VERSION%%.*}" -ge 4 ]] || {
  [[ "$PLATFORM" == "mac" ]] && die "bash 4+ required. Run: brew install bash"
  [[ "$PLATFORM" == "gitbash" ]] && die "bash 4+ required. Update Git for Windows: https://git-scm.com"
  die "bash 4+ required (you have $BASH_VERSION)"
}

command -v python3 &>/dev/null || die "python3 not found → https://python.org/downloads"
command -v curl    &>/dev/null || die "curl not found"

ok "Requirements satisfied"

# ── Download ──────────────────────────────────────────────────────────────────
info "Downloading cgit..."
TMP=$(mktemp)
trap 'rm -f "$TMP"' EXIT

curl -fsSL "$CGIT_URL" -o "$TMP" || die "Download failed — is $CGIT_SERVER reachable?"
head -1 "$TMP" | grep -q "env bash\|bin/bash\|bin/sh" || die "Downloaded file doesn't look right"
chmod +x "$TMP"
ok "Downloaded ($(wc -c < "$TMP" | tr -d ' ') bytes)"

# ── Install ───────────────────────────────────────────────────────────────────
info "Installing..."

INSTALL_DIR=""

try_install() {
  local dir="$1"
  if [[ -d "$dir" && -w "$dir" ]]; then
    cp "$TMP" "$dir/cgit"
    INSTALL_DIR="$dir"
    return 0
  fi
  return 1
}

case "$PLATFORM" in
  gitbash)
    # Git Bash automatically adds ~/bin to PATH when the directory exists.
    # This is the safest and cleanest location on Windows — no PATH editing needed.
    mkdir -p "$HOME/bin"
    cp "$TMP" "$HOME/bin/cgit"
    INSTALL_DIR="$HOME/bin"
    ;;
  mac|linux|wsl)
    try_install /usr/local/bin \
    || { command -v sudo &>/dev/null && sudo cp "$TMP" /usr/local/bin/cgit && INSTALL_DIR=/usr/local/bin; } \
    || try_install /usr/bin \
    || { mkdir -p "$HOME/.local/bin" && try_install "$HOME/.local/bin"; } \
    || die "No writable install location found"
    ;;
esac

INSTALL_PATH="$INSTALL_DIR/cgit"
ok "Installed to $INSTALL_PATH"

# ── PATH ─────────────────────────────────────────────────────────────────────
in_path() { [[ ":${PATH}:" == *":${1}:"* ]]; }

if in_path "$INSTALL_DIR"; then
  ok "$INSTALL_DIR is already on PATH"
else
  # Pick config file
  case "$PLATFORM" in
    gitbash)
      # ~/bin is added by Git Bash's /etc/profile automatically — no config edit needed.
      # Just need a new terminal. But we add it anyway in case this Git Bash version skips it.
      RC="$HOME/.bash_profile"
      ;;
    mac)
      RC="${HOME}/$( [[ "$SHELL" == */zsh ]] && echo .zshrc || echo .bash_profile )"
      ;;
    wsl|linux)
      RC="$HOME/.bashrc"
      [[ -f "$HOME/.bash_profile" && ! -f "$HOME/.bashrc" ]] && RC="$HOME/.bash_profile"
      ;;
  esac

  # Write to config if not already there
  if ! grep -qF "$INSTALL_DIR" "$RC" 2>/dev/null; then
    touch "$RC"
    printf '\n# cgit\nexport PATH="%s:$PATH"\n' "$INSTALL_DIR" >> "$RC"
    ok "Added $INSTALL_DIR to PATH in $RC"
  fi

  # Make it available right now in this process too
  export PATH="$INSTALL_DIR:$PATH"
fi

# ── Verify ────────────────────────────────────────────────────────────────────
# Use 'bash path/to/cgit' instead of running directly — avoids shebang issues on Windows
if bash "$INSTALL_PATH" help &>/dev/null; then
  ok "cgit works"
else
  warn "Installed but verification failed — check that python3 is available"
fi

# ── Done ──────────────────────────────────────────────────────────────────────
printf "\n${G}${BOLD}Done!${NC}\n\n"

if [[ "$PLATFORM" == "gitbash" ]]; then
  printf "  ${Y}Open a new Git Bash window${NC} — cgit will be on your PATH.\n"
  printf "  (Git Bash adds ~/bin to PATH automatically on startup)\n\n"
elif [[ "$PLATFORM" == "wsl" || "$PLATFORM" == "linux" ]]; then
  in_path "$INSTALL_DIR" || printf "  Run: ${BOLD}source %s${NC}\n\n" "$RC"
elif [[ "$PLATFORM" == "mac" ]]; then
  in_path "$INSTALL_DIR" || printf "  Run: ${BOLD}source %s${NC}\n\n" "$RC"
fi

printf "  cgit clone %s/REPONAME\n" "$CGIT_SERVER"
printf "  cgit help\n\n"