#!/usr/bin/env bash
# dots-themes-fetch.sh — download the third-party theme files this repo's configs use but the
# repo doesn't ship. Each host fetches its own copy from upstream, so the repo redistributes
# nothing and needs no licence notice. (Same idea as bin/dots-icons-link.sh, which links Tela's
# icons from the host instead of shipping them.)
#
# Every entry is pinned to an upstream commit plus a sha256, so a fetch is exactly the file
# that was reviewed. To update one: bump the commit in the URL, check the diff, then replace
# the checksum with `curl -fsSL <url> | sha256sum`.
#
# Usage: bin/dots-themes-fetch.sh [-n]   (-n = dry run). Idempotent; ./install.sh runs it on
# every host. A destination that's already a real file is left alone, even if its content
# differs (a local edit wins). A symlink there (e.g. the stow link left dangling after the
# repo dropped the file) is replaced: mv swaps the link itself, never writes through it.
# Exit 1 if a download or checksum failed; the app then falls back to its built-in theme, so
# install.sh only warns.
set -euo pipefail

DRY=0
[ "${1:-}" = "-n" ] && DRY=1
cfg="${XDG_CONFIG_HOME:-$HOME/.config}"

# dest|sha256|url
themes=(
  # aichat: One Half Dark by Son A. Pham (MIT), loaded as <config>/dark.tmTheme when present
  "$cfg/aichat/dark.tmTheme|6205e2311e433841f0aa1b15862b46cb892b003650f31df508a4ebc39a27bdbb|https://raw.githubusercontent.com/sonph/onehalf/d13f47b0c20923eb13335f7effc5e8ec4431a5cd/sublimetext/OneHalfDark.tmTheme"
)

fetched=0 ok=0 kept=0 bad=0
for t in "${themes[@]}"; do
  IFS='|' read -r dst sum url <<<"$t"
  name="$dst"
  case "$dst" in "$HOME"/*) name="~${dst#"$HOME"}" ;; esac
  if [ ! -d "$(dirname "$dst")" ]; then
    echo "  themes: $name skipped (app not configured on this host)"
    continue
  fi
  if [ -f "$dst" ] && [ ! -L "$dst" ]; then
    if [ "$(sha256sum <"$dst" | cut -d' ' -f1)" = "$sum" ]; then
      ok=$((ok + 1))
    else
      echo "  themes: $name is a real file with other content — left alone"
      kept=$((kept + 1))
    fi
    continue
  fi
  if [ "$DRY" = 1 ]; then
    echo "  themes: would fetch $name"
    fetched=$((fetched + 1))
    continue
  fi
  tmp="$(mktemp "$dst.XXXXXX")"
  if curl -fsSL --connect-timeout 5 --max-time 30 "$url" -o "$tmp" \
    && [ "$(sha256sum <"$tmp" | cut -d' ' -f1)" = "$sum" ]; then
    chmod 644 "$tmp"
    mv -f "$tmp" "$dst"
    fetched=$((fetched + 1))
  else
    rm -f "$tmp"
    echo "  themes: could not fetch $name (offline, or the checksum changed) — app uses its built-in theme" >&2
    bad=$((bad + 1))
  fi
done

verb="fetched"
[ "$DRY" = 1 ] && verb="would fetch"
echo "  themes: $verb $fetched, $ok already present, $kept kept as local, $bad problem(s)"
[ "$bad" -eq 0 ]