#!/bin/bash
# session-init.sh - Loads context at session start

PROJECT_ROOT=$(git rev-parse --show-toplevel 2>/dev/null || echo ".")
STATE_FILE="$PROJECT_ROOT/.planning/STATE.md"

# Reset delivery-gate bookkeeping for the new session (edit counter + one-shot marker)
GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
if [ -n "$GIT_DIR" ] && [ -d "$GIT_DIR" ]; then
  echo 0 > "$GIT_DIR/frame-edit-count" 2>/dev/null
  rm -f "$GIT_DIR/frame-delivery-gate-fired" 2>/dev/null
fi

# Write session start timestamp for telemetry
SESSIONS_DIR="$PROJECT_ROOT/.planning/sessions"
if [ -d "$SESSIONS_DIR" ] && command -v git >/dev/null 2>&1; then
  SESSION_FILE="$SESSIONS_DIR/$(date -u +"%Y-%m-%dT%H-%M-%SZ").json"
  BRANCH=$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "unknown")
  TASK=$(grep "^- Task:" "$STATE_FILE" 2>/dev/null | head -1 | sed 's/.*Task: //' || echo "")
  printf '{"started_at":"%s","branch":"%s","task":"%s"}\n' \
    "$(date -u +"%Y-%m-%dT%H:%M:%SZ")" "$BRANCH" "$TASK" > "$SESSION_FILE"
fi

# Onboarding: STATE.md missing or not yet filled (only template headers)
if [ ! -f "$STATE_FILE" ] || ! grep -q "^- Phase:" "$STATE_FILE" 2>/dev/null; then
  echo "╔══════════════════════════════════════════╗"
  echo "║         FRAME — Getting Started          ║"
  echo "╚══════════════════════════════════════════╝"
  echo ""
  echo "  FRAME is installed but not yet initialized."
  echo ""
  echo "  Next step: run /frame:init"
  echo "  This will scan your project and fill in"
  echo "  MAP.md, CLAUDE.md, and STATE.md."
  echo ""
  exit 0
fi

LAST_ACTIVITY=0
if [[ "$OSTYPE" == "darwin"* ]]; then
  LAST_ACTIVITY=$(stat -f %m "$STATE_FILE" 2>/dev/null || echo 0)
else
  LAST_ACTIVITY=$(stat -c %Y "$STATE_FILE" 2>/dev/null || echo 0)
fi
NOW=$(date +%s)
ELAPSED=$(( NOW - LAST_ACTIVITY ))

PHASE=$(grep "^- Phase:" "$STATE_FILE" 2>/dev/null | head -1 | sed 's/.*Phase: //')
FEATURE=$(grep "^- Feature:" "$STATE_FILE" 2>/dev/null | head -1 | sed 's/.*Feature: //')
TASK=$(grep "^- Task:" "$STATE_FILE" 2>/dev/null | head -1 | sed 's/.*Task: //')

# STATE.md bloat check — history blocks accumulate and are never trimmed automatically.
# Threshold: 200 lines (a healthy STATE.md is the current block + a few history blocks).
STATE_BLOAT_THRESHOLD=200
STATE_LINES=$(wc -l < "$STATE_FILE" 2>/dev/null | tr -d ' ')
STATE_WARN=""
if [ "${STATE_LINES:-0}" -gt "$STATE_BLOAT_THRESHOLD" ]; then
  STATE_WARN="⚠ FRAME: STATE.md has grown to ${STATE_LINES} lines — run /frame:cleanup-memory to archive old history blocks."
fi

# < 2 hours: one-liner
if [ "$ELAPSED" -lt 7200 ]; then
  echo "FRAME | Phase: ${PHASE:-?} | Feature: ${FEATURE:-?} | Task: ${TASK:-?}"
  [ -n "$STATE_WARN" ] && echo "$STATE_WARN"
  exit 0
fi

# 2-24 hours: brief digest
if [ "$ELAPSED" -lt 86400 ]; then
  echo "╔══════════════════════════════════════════╗"
  echo "║           FRAME — Welcome back           ║"
  echo "╚══════════════════════════════════════════╝"
  echo ""
  echo "  Phase: ${PHASE:-?} | Feature: ${FEATURE:-?}"
  echo "  Task:  ${TASK:-?}"
  echo ""
  echo "  Recent commits:"
  git log --oneline -3 2>/dev/null | sed 's/^/    /'
  echo ""
  [ -n "$STATE_WARN" ] && echo "  $STATE_WARN" && echo ""
  exit 0
fi

# > 24 hours: full context
echo "╔══════════════════════════════════════════╗"
echo "║        FRAME SESSION INITIALIZED         ║"
echo "╚══════════════════════════════════════════╝"
echo ""

if [ -f "$STATE_FILE" ]; then
  echo "Current State:"
  head -15 "$STATE_FILE" | sed 's/^/  /'
  echo ""
fi

MAP_FILE="$PROJECT_ROOT/.planning/MAP.md"
if [ -f "$MAP_FILE" ]; then
  echo "Project:"
  grep "^## Quick Facts" -A 6 "$MAP_FILE" 2>/dev/null | head -7 | sed 's/^/  /'
  echo ""
fi

echo "  Recent commits:"
git log --oneline -5 2>/dev/null | sed 's/^/    /'
echo ""
echo "Commands: /frame:status, /frame:context, /frame:daily, /frame:fast"
echo ""
[ -n "$STATE_WARN" ] && echo "$STATE_WARN" && echo ""

exit 0