#!/usr/bin/env python3
"""
habits - Simple habit tracker with streaks

Track daily habits and maintain streaks.
"""

import json
import sys
from datetime import datetime, timedelta
from pathlib import Path

WORKSPACE = Path("/home/wdjones/.openclaw/workspace")
HABITS_FILE = WORKSPACE / "data" / "habits.json"

def load_data() -> dict:
    """Load habits data."""
    HABITS_FILE.parent.mkdir(parents=True, exist_ok=True)
    if HABITS_FILE.exists():
        with open(HABITS_FILE) as f:
            return json.load(f)
    return {'habits': {}, 'log': {}}

def save_data(data: dict):
    """Save habits data."""
    with open(HABITS_FILE, 'w') as f:
        json.dump(data, f, indent=2)

def add_habit(name: str, description: str = ""):
    """Add a new habit to track."""
    data = load_data()
    
    if name in data['habits']:
        print(f"Habit already exists: {name}")
        return
    
    data['habits'][name] = {
        'description': description,
        'created': datetime.now().isoformat(),
        'active': True,
    }
    save_data(data)
    print(f"✓ Added habit: {name}")

def check_habit(name: str, date: str = None):
    """Mark a habit as done for a date."""
    data = load_data()
    
    if name not in data['habits']:
        print(f"Habit not found: {name}")
        print("Use 'habits list' to see all habits")
        return
    
    if date is None:
        date = datetime.now().strftime("%Y-%m-%d")
    
    if date not in data['log']:
        data['log'][date] = []
    
    if name in data['log'][date]:
        print(f"Already checked: {name} on {date}")
        return
    
    data['log'][date].append(name)
    save_data(data)
    
    streak = calculate_streak(data, name)
    print(f"✓ {name} - done!")
    if streak > 1:
        print(f"  🔥 {streak} day streak!")

def calculate_streak(data: dict, habit: str) -> int:
    """Calculate current streak for a habit."""
    streak = 0
    date = datetime.now()
    
    while True:
        date_str = date.strftime("%Y-%m-%d")
        if date_str in data['log'] and habit in data['log'][date_str]:
            streak += 1
            date -= timedelta(days=1)
        else:
            break
    
    return streak

def list_habits():
    """List all habits with today's status."""
    data = load_data()
    
    if not data['habits']:
        print("No habits tracked yet.")
        print("Use 'habits add <name>' to add one")
        return
    
    today = datetime.now().strftime("%Y-%m-%d")
    today_done = data['log'].get(today, [])
    
    print("\n📊 Habits")
    print("=" * 40)
    
    for name, info in sorted(data['habits'].items()):
        if not info.get('active', True):
            continue
        
        done = "✅" if name in today_done else "⬜"
        streak = calculate_streak(data, name)
        streak_str = f"🔥{streak}" if streak > 0 else ""
        
        print(f"{done} {name:20} {streak_str}")
        if info.get('description'):
            print(f"   {info['description']}")
    
    print()
    done_count = len([h for h in data['habits'] if h in today_done])
    total = len([h for h, i in data['habits'].items() if i.get('active', True)])
    print(f"Today: {done_count}/{total} complete")

def show_week():
    """Show the past week's habit completion."""
    data = load_data()
    
    if not data['habits']:
        print("No habits tracked yet.")
        return
    
    habits = [h for h, i in data['habits'].items() if i.get('active', True)]
    
    print("\n📅 Last 7 Days")
    print("=" * 50)
    
    # Header
    print(f"{'Habit':15}", end="")
    for i in range(6, -1, -1):
        date = datetime.now() - timedelta(days=i)
        print(f" {date.strftime('%a'):>3}", end="")
    print()
    
    # Each habit
    for habit in sorted(habits):
        print(f"{habit[:15]:15}", end="")
        for i in range(6, -1, -1):
            date = (datetime.now() - timedelta(days=i)).strftime("%Y-%m-%d")
            done = "✓" if date in data['log'] and habit in data['log'][date] else "·"
            print(f" {done:>3}", end="")
        
        streak = calculate_streak(data, habit)
        if streak > 0:
            print(f"  🔥{streak}", end="")
        print()

def remove_habit(name: str):
    """Remove a habit."""
    data = load_data()
    
    if name not in data['habits']:
        print(f"Habit not found: {name}")
        return
    
    data['habits'][name]['active'] = False
    save_data(data)
    print(f"✓ Removed: {name}")

def main():
    if len(sys.argv) < 2:
        print("Usage:")
        print("  habits list              - Show all habits")
        print("  habits week              - Show weekly view")
        print("  habits add <name> [desc] - Add a habit")
        print("  habits check <name>      - Mark habit done today")
        print("  habits remove <name>     - Remove a habit")
        print("")
        print("Examples:")
        print("  habits add exercise 'Daily workout'")
        print("  habits check exercise")
        list_habits()
        return
    
    cmd = sys.argv[1]
    
    if cmd == 'list':
        list_habits()
    elif cmd == 'week':
        show_week()
    elif cmd == 'add' and len(sys.argv) > 2:
        name = sys.argv[2]
        desc = ' '.join(sys.argv[3:]) if len(sys.argv) > 3 else ""
        add_habit(name, desc)
    elif cmd == 'check' and len(sys.argv) > 2:
        check_habit(sys.argv[2])
    elif cmd == 'remove' and len(sys.argv) > 2:
        remove_habit(sys.argv[2])
    else:
        print("Unknown command. Run 'habits' for help.")

if __name__ == "__main__":
    main()