#!/usr/bin/env python3
"""
Manage session templates for common workflows.
Usage: python3 session-template.py [--list|--create NAME|--use NAME|--delete NAME]
"""

import argparse
import json
import sys
from datetime import datetime
from pathlib import Path
from typing import Dict, List, Optional

CLAUDE_DIR = Path.home() / ".claude"
TEMPLATES_DIR = CLAUDE_DIR / "state" / "personal-assistant" / "templates"


def ensure_templates_dir():
    """Ensure templates directory exists."""
    TEMPLATES_DIR.mkdir(parents=True, exist_ok=True)


def load_template(name: str) -> Optional[Dict]:
    """Load a template by name."""
    template_file = TEMPLATES_DIR / f"{name}.json"
    try:
        with open(template_file) as f:
            return json.load(f)
    except (FileNotFoundError, json.JSONDecodeError):
        return None


def save_template(name: str, template: Dict):
    """Save a template."""
    ensure_templates_dir()
    template_file = TEMPLATES_DIR / f"{name}.json"
    with open(template_file, "w") as f:
        json.dump(template, f, indent=2)


def list_templates():
    """List available templates."""
    ensure_templates_dir()

    templates = list(TEMPLATES_DIR.glob("*.json"))

    if not templates:
        print("\nNo templates found. Create one with --create <name>")
        print("\nBuilt-in templates you can create:")
        print("  - daily-standup: Morning status check and planning")
        print("  - code-review: Review code changes")
        print("  - troubleshoot: Debug an issue")
        print("  - deploy: Deployment workflow")
        return

    print(f"\n📋 Session Templates ({len(templates)})\n")

    for t in sorted(templates):
        template = load_template(t.stem)
        if template:
            desc = template.get("description", "No description")
            category = template.get("category", "general")
            print(f"  {t.stem}")
            print(f"    Category: {category}")
            print(f"    {desc}")
            print("")


def create_template(name: str, interactive: bool = True):
    """Create a new template."""
    ensure_templates_dir()

    # Check for built-in templates
    builtin_templates = {
        "daily-standup": {
            "name": "daily-standup",
            "description": "Morning status check and planning",
            "category": "routine",
            "context_level": "moderate",
            "initial_commands": ["/status"],
            "checklist": [
                "Check system health",
                "Review pending items",
                "Check calendar",
                "Plan priorities"
            ],
            "prompt_template": "Good morning! Let's start with a quick status check and plan the day."
        },
        "code-review": {
            "name": "code-review",
            "description": "Review code changes in a project",
            "category": "development",
            "context_level": "comprehensive",
            "initial_commands": [],
            "checklist": [
                "Understand the change scope",
                "Check for issues",
                "Verify tests",
                "Suggest improvements"
            ],
            "prompt_template": "Please review the recent changes in {project}. Focus on {focus_areas}."
        },
        "troubleshoot": {
            "name": "troubleshoot",
            "description": "Debug an issue systematically",
            "category": "debugging",
            "context_level": "comprehensive",
            "initial_commands": ["/debug"],
            "checklist": [
                "Gather symptoms",
                "Check logs",
                "Identify root cause",
                "Implement fix",
                "Verify resolution"
            ],
            "prompt_template": "I'm experiencing {issue}. Let's debug this systematically."
        },
        "deploy": {
            "name": "deploy",
            "description": "Deploy application to environment",
            "category": "operations",
            "context_level": "moderate",
            "initial_commands": ["/k8s:cluster-status"],
            "checklist": [
                "Verify cluster health",
                "Check application readiness",
                "Perform deployment",
                "Verify deployment",
                "Monitor for issues"
            ],
            "prompt_template": "Deploy {app} to {environment}."
        }
    }

    if name in builtin_templates:
        template = builtin_templates[name]
        save_template(name, template)
        print(f"✓ Created template from built-in: {name}")
        print(f"  {template['description']}")
        return

    if interactive:
        print(f"\nCreating new template: {name}\n")

        template = {
            "name": name,
            "created": datetime.now().isoformat(),
        }

        # Get details interactively
        template["description"] = input("Description: ").strip() or "No description"
        template["category"] = input("Category [general]: ").strip() or "general"
        template["context_level"] = input("Context level [moderate]: ").strip() or "moderate"

        print("Initial commands (comma-separated, e.g., /status,/debug): ")
        commands = input("> ").strip()
        template["initial_commands"] = [c.strip() for c in commands.split(",") if c.strip()]

        print("Checklist items (one per line, empty line to finish):")
        checklist = []
        while True:
            item = input("  - ").strip()
            if not item:
                break
            checklist.append(item)
        template["checklist"] = checklist

        template["prompt_template"] = input("Prompt template: ").strip()

        save_template(name, template)
        print(f"\n✓ Template '{name}' created successfully")
    else:
        # Create minimal template
        template = {
            "name": name,
            "description": "Custom template",
            "category": "custom",
            "context_level": "moderate",
            "initial_commands": [],
            "checklist": [],
            "prompt_template": "",
            "created": datetime.now().isoformat()
        }
        save_template(name, template)
        print(f"✓ Created empty template: {name}")
        print(f"  Edit: {TEMPLATES_DIR / f'{name}.json'}")


def use_template(name: str):
    """Display template for use."""
    template = load_template(name)

    if not template:
        print(f"Template '{name}' not found.")
        list_templates()
        return

    print(f"\n📋 Template: {name}\n")
    print(f"Description: {template.get('description', 'No description')}")
    print(f"Category: {template.get('category', 'general')}")
    print(f"Context: {template.get('context_level', 'moderate')}")

    commands = template.get("initial_commands", [])
    if commands:
        print(f"\nInitial commands:")
        for cmd in commands:
            print(f"  {cmd}")

    checklist = template.get("checklist", [])
    if checklist:
        print(f"\nChecklist:")
        for i, item in enumerate(checklist, 1):
            print(f"  [ ] {item}")

    prompt = template.get("prompt_template", "")
    if prompt:
        print(f"\nPrompt template:")
        print(f"  {prompt}")

    print("")


def delete_template(name: str):
    """Delete a template."""
    template_file = TEMPLATES_DIR / f"{name}.json"

    if not template_file.exists():
        print(f"Template '{name}' not found.")
        return

    template_file.unlink()
    print(f"✓ Deleted template: {name}")


def main():
    parser = argparse.ArgumentParser(description="Manage session templates")
    parser.add_argument("--list", "-l", action="store_true", help="List templates")
    parser.add_argument("--create", "-c", type=str, help="Create a template")
    parser.add_argument("--use", "-u", type=str, help="Use a template")
    parser.add_argument("--delete", "-d", type=str, help="Delete a template")
    parser.add_argument("--non-interactive", "-n", action="store_true",
                       help="Non-interactive mode for --create")

    args = parser.parse_args()

    if args.create:
        create_template(args.create, interactive=not args.non_interactive)
    elif args.use:
        use_template(args.use)
    elif args.delete:
        delete_template(args.delete)
    else:
        list_templates()


if __name__ == "__main__":
    main()