#!/usr/bin/env bash
# Host-development implementation for scripts/agent.sh --host-dev <name>.
set -euo pipefail
REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$REPO"

usage() {
    echo 'Usage: scripts/agent.sh --host-dev AGENT [--fresh] [--check] [--soul FILE] [--constitution FILE] [--user FILE] [--provider NAME] [--model ID] [--thinking LEVEL]'
    echo 'Default: resume the latest agent development conversation; first launch starts one.'
}
fail() { echo "${AGENT:-tui}: $*" >&2; exit 1; }
case "${1:-}" in
    --help|-h) usage; exit 0 ;;
    "") usage >&2; exit 1 ;;
esac
AGENT="$1"
shift
[[ "$AGENT" =~ ^[a-z0-9][a-z0-9._-]{0,63}$ ]] || fail "invalid agent name"
[ -d "$REPO/agents/$AGENT" ] || fail "unknown agent: $AGENT"
SOUL="$REPO/agents/$AGENT/SOUL.md"
CONSTITUTION="$REPO/contracts/CONSTITUTION.md"
USER_FILE=""
PROVIDER=""
MODEL=""
THINKING=""
FRESH=false
CHECK=false
while [ "$#" -gt 0 ]; do
    case "$1" in
        --fresh) FRESH=true; shift ;;
        --check) CHECK=true; shift ;;
        --provider|--model|--thinking)
            [ "$#" -ge 2 ] && [ -n "$2" ] && [[ "$2" != --* ]] || fail "$1 needs a value"
            case "$1" in
                --provider) PROVIDER="$2" ;;
                --model) MODEL="$2" ;;
                --thinking) THINKING="$2" ;;
            esac
            shift 2 ;;
        --soul|--constitution|--user)
            [ "$#" -ge 2 ] && [ -n "$2" ] || fail "$1 needs a file"
            case "$1" in
                --soul) SOUL="$2" ;;
                --constitution) CONSTITUTION="$2" ;;
                --user) USER_FILE="$2" ;;
            esac
            shift 2 ;;
        --help|-h) usage; exit 0 ;;
        *) usage >&2; fail "unknown argument: $1" ;;
    esac
done

# Reuse the deployment's validated provider/model and live user profile.
source "$REPO/scripts/common.sh"
load_config
[ "$MOSAIC_ADAPTER" = pi ] || fail 'native launcher requires the pi adapter'
PROVIDER="${PROVIDER:-$MOSAIC_PROVIDER}"
MODEL="${MODEL:-$MOSAIC_MODEL}"
THINKING_ARGS=()
if [ -n "$THINKING" ]; then
    case "$THINKING" in
        off|minimal|low|medium|high|xhigh|max) THINKING_ARGS=(--thinking "$THINKING") ;;
        *) fail "invalid thinking level: $THINKING" ;;
    esac
fi
USER_FILE="${USER_FILE:-$MOSAIC_DATA_ROOT/user/USER.md}"
PI="$REPO/node_modules/.bin/pi"
[ -x "$PI" ] || fail 'run npm ci --ignore-scripts --no-audit --no-fund in the repository first'
PIN="$(node -p "require('./package.json').dependencies['@earendil-works/pi-coding-agent']")"
[ "$("$PI" --version)" = "$PIN" ] || fail "local Pi must match package.json ($PIN); run npm ci"
command -v flock >/dev/null || fail 'flock is required'
CONTEXT_FILES=("$CONSTITUTION" "$REPO/contracts/STANDARDS.md" "$SOUL" "$USER_FILE" "$REPO/AGENTS.md" "$REPO/agents/$AGENT/CONTEXT.md")
for file in "${CONTEXT_FILES[@]}"; do
    [ -f "$file" ] && [ -r "$file" ] && [ -s "$file" ] || fail "missing, unreadable or empty context: $file"
done
SKILLS=(ms-tools ms-file-read ms-file-write ms-conductor ms-communications
        ms-agent-watch ms-sdlc ms-proactive-agent ms-goal ms-unslop)
SKILL_ARGS=()
for skill in "${SKILLS[@]}"; do
    [ -s "$REPO/skills/$skill/SKILL.md" ] || fail "missing skill: $skill"
    SKILL_ARGS+=(--skill "$REPO/skills/$skill")
done
[ -s "$REPO/extensions/goal/index.ts" ] || fail 'missing canonical goal extension'
STATE="$REPO/.pi/state/$AGENT"
echo "$AGENT: native host TUI | Pi $PIN | $PROVIDER/$MODEL${THINKING:+:$THINKING}"
echo "$AGENT: workspace $REPO"
echo "$AGENT: SOUL=$SOUL | CONSTITUTION=$CONSTITUTION | USER=$USER_FILE"
echo "$AGENT: sessions $STATE/sessions | skills: ${SKILLS[*]}"
if "$CHECK"; then
    echo "$AGENT: configuration checks passed (no TUI, authentication request or model call)"
    exit 0
fi
[ -t 0 ] && [ -t 1 ] || fail 'launch from an interactive terminal (or use --check)'
umask 077
mkdir -p "$STATE/sessions" "$STATE/launches"
exec 8>"$STATE/launch.lock"
flock -n 8 || fail "another $AGENT TUI from this launcher is active"

# The native packaging path verifies source copies and refuses installation drift.
scripts/sync-dev-extensions.sh
SESSION_ARGS=(--session-dir "$STATE/sessions")
shopt -s nullglob dotglob
SESSION_FILES=("$STATE/sessions/"*.jsonl)
SESSION_ENTRIES=("$STATE/sessions/"*)
if ! "$FRESH"; then
    if [ "${#SESSION_FILES[@]}" -gt 0 ]; then
        # Pi --continue otherwise silently skips broken files and may start fresh.
        node "$REPO/agents/$AGENT/validate-sessions.mjs" "${SESSION_FILES[@]}"
        SESSION_ARGS+=(--continue)
        echo "$AGENT: resuming latest development conversation with current launch context"
    elif [ "${#SESSION_ENTRIES[@]}" -gt 0 ]; then
        fail 'session directory has state but no JSONL conversation; inspect it before using --fresh'
    else
        echo "$AGENT: starting first development conversation"
    fi
else
    echo "$AGENT: starting a fresh conversation; earlier conversations are preserved"
fi

# A private snapshot per launch avoids the container loader's shared prompt file.
LAUNCH="$(mktemp -d "$STATE/launches/launch.XXXXXXXX")"
PROMPT="$LAUNCH/context.md"
for file in "${CONTEXT_FILES[@]}"; do
    printf '\n===== %s (%s) =====\n' "$(basename "$file")" "$file" >> "$PROMPT"
    cat "$file" >> "$PROMPT"
    printf '\n' >> "$PROMPT"
done
sha256sum "$PROMPT" > "$LAUNCH/context.sha256"
echo "$AGENT: context snapshot $PROMPT"
unset MOSAIC_LAUNCH_INCARNATION
export MOSAIC_AGENT_NAME="$AGENT"
# Explicit resources only; preserve Pi's built-in coding prompt and tool guidance.
# goal_report must be in the tool allowlist as well as the extension being loaded.
exec "$PI" --approve --offline --no-context-files --no-extensions --no-skills \
    --no-prompt-templates --no-themes \
    --extension "$REPO/.pi/extensions/goal/index.ts" \
    "${SKILL_ARGS[@]}" \
    --tools read,bash,edit,write,grep,find,ls,goal_report \
    --provider "$PROVIDER" --model "$MODEL" "${THINKING_ARGS[@]}" \
    --append-system-prompt "$PROMPT" "${SESSION_ARGS[@]}"