#!/usr/bin/env bash
# scripts/fuse_and_load.sh
#
# AutoLoRA Step 5: Fuse LoRA adapter → convert to GGUF → import into Ollama
#
# Prerequisites:
#   - mlx_lm installed:  pip install mlx-lm
#   - llama.cpp cloned:  ~/llama.cpp (with convert_hf_to_gguf.py)
#   - Ollama running:    ollama serve (in another terminal)
#   - LoRA adapter at:   ~/timmy-lora-adapter
#   - Base model at:     $HERMES_MODEL_PATH (see below)
#
# Usage:
#   ./scripts/fuse_and_load.sh
#   HERMES_MODEL_PATH=/custom/path ./scripts/fuse_and_load.sh
#   QUANT=q4_k_m ./scripts/fuse_and_load.sh
#
# Environment variables:
#   HERMES_MODEL_PATH   Path to the Hermes 4 14B HF model dir (default below)
#   ADAPTER_PATH        Path to LoRA adapter (default: ~/timmy-lora-adapter)
#   FUSED_DIR           Where to save the fused HF model (default: ~/timmy-fused-model)
#   GGUF_PATH           Where to save the GGUF file (default: ~/timmy-fused-model.Q5_K_M.gguf)
#   QUANT               GGUF quantisation (default: q5_k_m)
#   OLLAMA_MODEL        Name to register in Ollama (default: timmy)
#   MODELFILE           Path to Modelfile (default: Modelfile.timmy in repo root)
#   SKIP_FUSE           Set to 1 to skip fuse step (use existing fused model)
#   SKIP_CONVERT        Set to 1 to skip GGUF conversion (use existing GGUF)
#
# Epic: #1091 Project Bannerlord — AutoLoRA Sovereignty Loop (Step 5 of 7)
# Refs: #1104

set -euo pipefail

# ── Config ────────────────────────────────────────────────────────────────────

HERMES_MODEL_PATH="${HERMES_MODEL_PATH:-${HOME}/hermes4-14b-hf}"
ADAPTER_PATH="${ADAPTER_PATH:-${HOME}/timmy-lora-adapter}"
FUSED_DIR="${FUSED_DIR:-${HOME}/timmy-fused-model}"
QUANT="${QUANT:-q5_k_m}"
GGUF_FILENAME="timmy-fused-model.${QUANT^^}.gguf"
GGUF_PATH="${GGUF_PATH:-${HOME}/${GGUF_FILENAME}}"
OLLAMA_MODEL="${OLLAMA_MODEL:-timmy}"
REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
MODELFILE="${MODELFILE:-${REPO_ROOT}/Modelfile.timmy}"

# ── Helpers ───────────────────────────────────────────────────────────────────

log()  { echo "[fuse_and_load] $*"; }
fail() { echo "[fuse_and_load] ERROR: $*" >&2; exit 1; }

require_cmd() {
    command -v "$1" >/dev/null 2>&1 || fail "'$1' not found. $2"
}

# ── Step 1: Fuse LoRA adapter into base model ─────────────────────────────────

if [[ "${SKIP_FUSE:-0}" == "1" ]]; then
    log "Skipping fuse step (SKIP_FUSE=1)"
else
    log "Step 1/3: Fusing LoRA adapter into base model"
    log "  Base model:  ${HERMES_MODEL_PATH}"
    log "  Adapter:     ${ADAPTER_PATH}"
    log "  Output dir:  ${FUSED_DIR}"

    require_cmd mlx_lm.fuse "Install with: pip install mlx-lm"

    [[ -d "${HERMES_MODEL_PATH}" ]] || fail "Base model directory not found: ${HERMES_MODEL_PATH}"
    [[ -d "${ADAPTER_PATH}" ]]      || fail "LoRA adapter directory not found: ${ADAPTER_PATH}"

    mlx_lm.fuse \
        --model "${HERMES_MODEL_PATH}" \
        --adapter-path "${ADAPTER_PATH}" \
        --save-path "${FUSED_DIR}"

    log "Fuse complete → ${FUSED_DIR}"
fi

# ── Step 2: Convert fused model to GGUF ──────────────────────────────────────

if [[ "${SKIP_CONVERT:-0}" == "1" ]]; then
    log "Skipping convert step (SKIP_CONVERT=1)"
else
    log "Step 2/3: Converting fused model to GGUF (${QUANT^^})"
    log "  Input:  ${FUSED_DIR}"
    log "  Output: ${GGUF_PATH}"

    LLAMACPP_CONVERT="${HOME}/llama.cpp/convert_hf_to_gguf.py"
    [[ -f "${LLAMACPP_CONVERT}" ]] || fail "llama.cpp convert script not found at ${LLAMACPP_CONVERT}.\n  Clone: git clone https://github.com/ggerganov/llama.cpp ~/llama.cpp"
    [[ -d "${FUSED_DIR}" ]]         || fail "Fused model directory not found: ${FUSED_DIR}"

    python3 "${LLAMACPP_CONVERT}" \
        "${FUSED_DIR}" \
        --outtype "${QUANT}" \
        --outfile "${GGUF_PATH}"

    log "Conversion complete → ${GGUF_PATH}"
fi

[[ -f "${GGUF_PATH}" ]] || fail "GGUF file not found at expected path: ${GGUF_PATH}"

# ── Step 3: Import into Ollama ────────────────────────────────────────────────

log "Step 3/3: Importing into Ollama as '${OLLAMA_MODEL}'"
log "  GGUF:      ${GGUF_PATH}"
log "  Modelfile: ${MODELFILE}"

require_cmd ollama "Install Ollama: https://ollama.com/download"

[[ -f "${MODELFILE}" ]] || fail "Modelfile not found: ${MODELFILE}"

# Patch the GGUF path into the Modelfile at runtime (sed on a copy)
TMP_MODELFILE="$(mktemp /tmp/Modelfile.timmy.XXXXXX)"
sed "s|^FROM .*|FROM ${GGUF_PATH}|" "${MODELFILE}" > "${TMP_MODELFILE}"

ollama create "${OLLAMA_MODEL}" -f "${TMP_MODELFILE}"
rm -f "${TMP_MODELFILE}"

log "Import complete. Verifying..."

# ── Verify ────────────────────────────────────────────────────────────────────

if ollama list | grep -q "^${OLLAMA_MODEL}"; then
    log "✓ '${OLLAMA_MODEL}' is registered in Ollama"
else
    fail "'${OLLAMA_MODEL}' not found in 'ollama list' — import may have failed"
fi

echo ""
echo "=========================================="
echo "  Timmy model loaded successfully"
echo "  Model:  ${OLLAMA_MODEL}"
echo "  GGUF:   ${GGUF_PATH}"
echo "=========================================="
echo ""
echo "Next steps:"
echo "  1. Test skills:      python scripts/test_timmy_skills.py"
echo "  2. Switch harness:   hermes model ${OLLAMA_MODEL}"
echo "  3. File issues for any failing skills"