#!/bin/sh
# Pi adapter: implements the Mosaic adapter contract for the pinned
# @earendil-works/pi-coding-agent CLI.
#
# Contract: see /opt/mosaic/adapters/README.md. stdout = response only.
set -eu

[ -n "${MOSAIC_SYSTEM_PROMPT_FILE:-}" ] || { echo "pi adapter: MOSAIC_SYSTEM_PROMPT_FILE is required" >&2; exit 2; }
[ -n "${MOSAIC_REQUEST:-}" ] || { echo "pi adapter: MOSAIC_REQUEST is required" >&2; exit 2; }
[ -r "$MOSAIC_SYSTEM_PROMPT_FILE" ] || { echo "pi adapter: system prompt not readable: $MOSAIC_SYSTEM_PROMPT_FILE" >&2; exit 2; }

: "${PI_PROVIDER:?pi adapter: PI_PROVIDER is required}"
: "${PI_MODEL:?pi adapter: PI_MODEL is required}"

# Workspace (M5): run inside the provided workspace when present.
if [ -n "${MOSAIC_WORKSPACE:-}" ]; then
    mkdir -p "$MOSAIC_WORKSPACE"
    cd "$MOSAIC_WORKSPACE"
fi

# Session (M6): persistent named session directory; resume the most recent
# session in that directory when one exists (pi documented flags).
# Default remains ephemeral (--no-session) when no session is declared.
SESSION_FLAGS="--no-session"
if [ -n "${MOSAIC_SESSION_DIR:-}" ]; then
    mkdir -p "$MOSAIC_SESSION_DIR"
    SESSION_FLAGS="--session-dir $MOSAIC_SESSION_DIR"
    if [ -n "$(ls -A "$MOSAIC_SESSION_DIR" 2>/dev/null)" ]; then
        SESSION_FLAGS="$SESSION_FLAGS -c"
    fi
fi

# Capabilities (M5): explicit allowlist or no tools.
TOOLS_FLAG="--no-tools"
[ -n "${MOSAIC_TOOLS:-}" ] && TOOLS_FLAG="--tools $MOSAIC_TOOLS"

# All flags documented in the pi package README (CLI Reference):
#   -p/--print     noninteractive: print the response and exit
#   --system-prompt  replace the default prompt with the generated one
#   --no-*         no ambient context/skills/extensions/templates/themes
#   --no-session   ephemeral; TOOLS_FLAG per capabilities
#   --offline      no startup network operations (update checks/telemetry)
exec pi \
    --offline \
    --no-extensions \
    --no-skills \
    --no-prompt-templates \
    --no-themes \
    --no-context-files \
    $TOOLS_FLAG \
    $SESSION_FLAGS \
    --provider "$PI_PROVIDER" \
    --model "$PI_MODEL" \
    --system-prompt "$(cat "$MOSAIC_SYSTEM_PROMPT_FILE")" \
    -p "$MOSAIC_REQUEST"