#!/usr/bin/env bash
# shellcheck disable=SC2034  # variables consumed by lib/common.sh
# lcclaude — launch Claude Code on Meituan LongCat's Anthropic-compatible API.
#
# Uses the official LongCat Anthropic-compatible endpoint:
#   https://api.longcat.chat/anthropic
#
# LongCat-2.0 is a 1.6T-param MoE model with native 1M context, built entirely
# on Chinese-manufactured compute. It ranked #2 globally in Claude Code monthly
# call volume on OpenRouter (behind only Claude Opus 4.8).
#
# Reads LONGCAT_API_KEY from the environment first, then falls back to
# ~/.zshrc / ~/.bashrc / ~/.bash_profile / ~/.profile if not already exported.
#
# Quick start (no install needed):
#   chmod +x lcclaude
#   ./lcclaude
#
# Optional — make it globally available:
#   sudo mv lcclaude /usr/local/bin/ && sudo chmod +x /usr/local/bin/lcclaude
#
# Use:
#   lcclaude                  # start on LongCat-2.0 (flagship)
#   lcclaude fast             # start on LongCat-Flash-Chat (cheaper / faster)
#   lcclaude think            # start on LongCat-Flash-Thinking (deep reasoning)
#   lcclaude long             # request 1M context window (native support)
#   lcclaude effort max       # set reasoning effort (low|medium|high|xhigh|max)
#   lcclaude update           # git pull latest from this repo
#   lcclaude --help           # any remaining flag is forwarded to claude
#
# Optional env overrides:
#   LONGCAT_MODEL=LongCat-2.0                 # main model
#   LONGCAT_FLASH_MODEL=LongCat-Flash-Chat    # flash / haiku / subagent tier
#   LONGCAT_BASE_URL=https://.../anthropic    # custom Anthropic-compatible base URL
#   LONGCAT_CTX=1048576                       # max context tokens (defaults to 1M with `long`)
#   LONGCAT_OUTPUT=8000                       # cap output tokens
#   LONGCAT_EFFORT=max                        # CLAUDE_CODE_EFFORT_LEVEL
#
# In-session switch:
#   /model LongCat-Flash-Chat      # switch to the fast tier
#   /model LongCat-Flash-Thinking  # switch to thinking tier
#   /model LongCat-2.0             # switch back to flagship
#
# Get your free API key (public beta — 500K tokens/day free):
#   https://longcat.chat/platform
#
set -euo pipefail

# Resolve symlink to find the real script directory.
_SELF="$0"
if [ -L "$_SELF" ]; then
  _LINK="$(readlink "$_SELF")"
  case "$_LINK" in
    /*) _SELF="$_LINK" ;;
    *)  _SELF="$(cd "$(dirname "$_SELF")" && pwd)/$_LINK" ;;
  esac
fi
SELF_DIR="$(cd "$(dirname "$_SELF")" && pwd)"
if [ -f "$SELF_DIR/lib/common.sh" ]; then source "$SELF_DIR/lib/common.sh"
elif [ -f "$SELF_DIR/../lib/common.sh" ]; then source "$SELF_DIR/../lib/common.sh"
else echo "lcclaude: cannot find lib/common.sh. Reinstall or cd to repo." >&2; exit 1; fi

check_version "lcclaude" "$@"

PRO_MODEL="${LONGCAT_MODEL:-LongCat-2.0}"
FLASH_MODEL="${LONGCAT_FLASH_MODEL:-LongCat-Flash-Chat}"
THINK_MODEL="${LONGCAT_THINK_MODEL:-LongCat-Flash-Thinking}"

if [ $# -gt 0 ] && [ "$1" = "update" ]; then
  do_update "lcclaude" "LCCLAUDE_HOME"
fi

API_KEY="$(resolve_api_key "LONGCAT_API_KEY")"
if [ -z "$API_KEY" ]; then
  echo "❌ LONGCAT_API_KEY not found." >&2
  echo "   Add one line to ~/.zshrc or ~/.bashrc:" >&2
  echo "     export LONGCAT_API_KEY=lc-xxxxxxxxxxxxxxxxxx" >&2
  echo "   Get your free key at: https://longcat.chat/platform" >&2
  exit 1
fi

BASE_URL="${LONGCAT_BASE_URL:-https://api.longcat.chat/anthropic}"

LONG_CTX=0
EFFORT="${LONGCAT_EFFORT:-}"

MAIN_MODEL="$PRO_MODEL"
while [ $# -gt 0 ]; do
  case "$1" in
    fast|flash) MAIN_MODEL="$FLASH_MODEL"; shift ;;
    think)      MAIN_MODEL="$THINK_MODEL"; shift ;;
    long) LONG_CTX=1; shift ;;
    effort)
      case "${2:-}" in
        low|medium|high|xhigh|max) EFFORT="$2"; shift 2 ;;
        *) echo "lcclaude: invalid effort level '${2:-}'. Use: low medium high xhigh max" >&2; exit 1 ;;
      esac
      ;;
    --) shift; break ;;
    *) break ;;
  esac
done

# Surface the other model in the /model picker.
if [ "$MAIN_MODEL" = "$PRO_MODEL" ]; then
  OTHER_MODEL="$FLASH_MODEL"
  OTHER_DESC="LongCat Flash Chat — fast / cheap tier"
elif [ "$MAIN_MODEL" = "$FLASH_MODEL" ]; then
  OTHER_MODEL="$PRO_MODEL"
  OTHER_DESC="LongCat 2.0 — flagship reasoning"
else
  OTHER_MODEL="$PRO_MODEL"
  OTHER_DESC="LongCat 2.0 — flagship reasoning"
fi

export_anthropic_base
export CLAUDE_CODE_SUBAGENT_MODEL="$FLASH_MODEL"
set_custom_model "$OTHER_MODEL" "$MAIN_MODEL" "$OTHER_DESC"

CTX="${LONGCAT_CTX:-}"
OUTPUT_CAP="${LONGCAT_OUTPUT:-}"
apply_context_and_effort

show_banner_and_launch "LongCat" "$@"