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

# Summarize the last 24h of selected Discord channels via DiscordChatExporter + kagi assistant.
#
# Requirements:
#   - DiscordChatExporter.Cli  (https://github.com/Tyrrrz/DiscordChatExporter)
#       default path below; override with DCE_CMD if installed elsewhere.
#   - kagi-cli authenticated with a session token.
#
# Config:
#   ~/.config/discord-summary/config   (sourced bash)
#     DISCORD_TOKEN="your-user-token"
#     CHANNELS=(
#       "111111111111111111:general"
#       "222222222222222222:dev-chat"
#     )   # format "<channel_id>:<label>"
#
# WARNING: uses your personal Discord token. Automating a user account violates
# Discord's ToS. This runs once and exits to minimize risk; use at your own peril.

CONFIG="${XDG_CONFIG_HOME:-$HOME/.config}/discord-summary/config"
DCE_CMD="${DCE_CMD:-$HOME/.local/bin/DiscordChatExporter.Cli.osx-arm64/DiscordChatExporter.Cli}"
HOURS="${HOURS:-24}"

[[ -f "$CONFIG" ]] || { echo "missing config: $CONFIG" >&2; exit 1; }
# shellcheck disable=SC1090
source "$CONFIG"

: "${DISCORD_TOKEN:?set DISCORD_TOKEN in config}"
[[ "${#CHANNELS[@]}" -gt 0 ]] || { echo "no CHANNELS defined in config" >&2; exit 1; }

command -v "$DCE_CMD" >/dev/null || { echo "DiscordChatExporter not found ($DCE_CMD)" >&2; exit 1; }
command -v kagi >/dev/null || { echo "kagi-cli not found" >&2; exit 1; }

after="$(date -u -v-"${HOURS}"H '+%Y-%m-%d %H:%M' 2>/dev/null \
  || date -u -d "${HOURS} hours ago" '+%Y-%m-%d %H:%M')"

workdir="$(mktemp -d)"
trap 'rm -rf "$workdir"' EXIT

prompt='Summarize the following Discord channel log from the last 24 hours.
Give a concise bulleted digest: key topics, decisions, questions raised, and
anything actionable. Skip greetings and noise. If nothing substantive happened,
say so in one line.'

for entry in "${CHANNELS[@]}"; do
  cid="${entry%%:*}"
  label="${entry#*:}"
  out="$workdir/$cid.txt"

  "$DCE_CMD" export \
    -t "$DISCORD_TOKEN" \
    -c "$cid" \
    --after "$after" \
    -f PlainText \
    -o "$out" >/dev/null 2>&1 || { echo "## $label — export failed"; echo; continue; }

  printf '\033[1;36m## %s\033[0m\n' "$label"
  if [[ ! -s "$out" ]] || [[ "$(wc -l <"$out")" -lt 5 ]]; then
    echo "  (no messages in the last ${HOURS}h)"
    echo
    continue
  fi

  message="$(printf '%s\n\nChannel #%s log:\n---\n%s' "$prompt" "$label" "$(cat "$out")")"
  kagi assistant --format pretty "$message"
  echo
done