#!/usr/bin/env python3
"""
Soleprint Build Tool

Builds the soleprint instance using modelgen for model generation.

Both dev and deploy modes copy files (no symlinks) for Docker compatibility.
After editing source files, re-run `python build.py dev` to update gen/.

Usage:
    python build.py dev                        # Build gen/standalone/
    python build.py dev --cfg amar             # Build gen/amar/
    python build.py dev --all                  # Build all (standalone + rooms)
    python build.py deploy --output /path/     # Build for production
    python build.py models                     # Only regenerate models

Examples:
    # Set up dev environment (standalone)
    python build.py dev
    cd gen/standalone && .venv/bin/python run.py

    # With room config
    python build.py dev --cfg amar
    cd gen/amar && .venv/bin/python run.py

    # Build all targets
    python build.py dev --all

    # Build for deployment
    python build.py deploy --output ../deploy/soleprint/
"""

import argparse
import logging
import os
import shutil
import subprocess
import sys
from pathlib import Path

# SPR root is where this script lives
SPR_ROOT = Path(__file__).resolve().parent

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(message)s",
)
log = logging.getLogger(__name__)


def ensure_dir(path: Path):
    """Create directory if it doesn't exist."""
    path.mkdir(parents=True, exist_ok=True)


def copy_path(source: Path, target: Path):
    """Copy file or directory, resolving symlinks."""
    if target.is_symlink():
        target.unlink()
    elif target.exists():
        if target.is_dir():
            shutil.rmtree(target)
        else:
            target.unlink()

    if source.is_dir():
        shutil.copytree(source, target, symlinks=False)
        log.info(f"  Copied: {target.name}/ ({count_files(target)} files)")
    else:
        shutil.copy2(source, target)
        log.info(f"  Copied: {target.name}")


def count_files(path: Path) -> int:
    """Count files in directory recursively."""
    return sum(1 for _ in path.rglob("*") if _.is_file())


def generate_models(output_dir: Path, cfg_name: str | None = None):
    """Generate models using modelgen tool.

    Args:
        output_dir: Directory where models/pydantic/__init__.py will be created
        cfg_name: Room config name (e.g., 'amar'), or None for standalone
    """
    room = cfg_name or "standalone"
    config_path = SPR_ROOT / "cfg" / room / "config.json"

    if not config_path.exists():
        log.warning(f"Config not found at {config_path}")
        return False

    # Soleprint-specific: models go in models/pydantic/__init__.py
    models_file = output_dir / "models" / "pydantic" / "__init__.py"
    models_file.parent.mkdir(parents=True, exist_ok=True)

    # Run modelgen as subprocess
    cmd = [
        sys.executable,
        "-m",
        "station.tools.modelgen",
        "from-config",
        "--config",
        str(config_path),
        "--output",
        str(models_file),
        "--format",
        "pydantic",
    ]

    result = subprocess.run(cmd, cwd=SPR_ROOT)
    return result.returncode == 0


def copy_cfg(output_dir: Path, cfg_name: str | None):
    """Copy configuration files to output directory.

    Args:
        output_dir: Target directory
        cfg_name: Name of room config (e.g., 'amar'), or None for standalone
    """
    room = cfg_name or "standalone"
    room_cfg = SPR_ROOT / "cfg" / room

    if not room_cfg.exists():
        log.warning(f"Room config '{room}' not found at {room_cfg}")
        return

    log.info(f"\nCopying {room} room config...")

    # Copy config.json to cfg/
    cfg_dir = output_dir / "cfg"
    ensure_dir(cfg_dir)
    room_config = room_cfg / "config.json"
    if room_config.exists():
        copy_path(room_config, cfg_dir / "config.json")

    # Copy data/ to output data/
    room_data = room_cfg / "data"
    if room_data.exists():
        log.info(f"  Copying {room} data files...")
        copy_path(room_data, output_dir / "data")

    # Copy .env.example to output root
    env_example = room_cfg / ".env.example"
    if env_example.exists():
        copy_path(env_example, output_dir / ".env.example")

    # Copy room-specific databrowse depot if exists
    room_databrowse = room_cfg / "databrowse" / "depot"
    if room_databrowse.exists():
        log.info(f"  Copying {room} databrowse depot...")
        target = output_dir / "station" / "monitors" / "databrowse" / "depot"
        copy_path(room_databrowse, target)

    # Copy room-specific tester tests if exists
    room_tests = room_cfg / "tester" / "tests"
    if room_tests.exists():
        log.info(f"  Copying {room} tester tests...")
        target = output_dir / "station" / "tools" / "tester" / "tests"
        copy_path(room_tests, target)

    # Copy room-specific monitors if exists
    room_monitors = room_cfg / "monitors"
    if room_monitors.exists():
        log.info(f"  Copying {room} monitors...")
        for monitor in room_monitors.iterdir():
            if monitor.is_dir():
                target = output_dir / "station" / "monitors" / monitor.name
                copy_path(monitor, target)

    # Copy room-specific models if exists
    room_models = room_cfg / "models"
    if room_models.exists():
        log.info(f"  Copying {room} models...")
        target = output_dir / "models" / room
        copy_path(room_models, target)


def build_dev(output_dir: Path, cfg_name: str | None = None):
    """
    Build for development using copies (Docker-compatible).

    Structure:
        gen/standalone/   or   gen/<room>/
        ├── main.py
        ├── run.py
        ├── index.html
        ├── requirements.txt
        ├── Dockerfile
        ├── dataloader/
        ├── artery/
        ├── atlas/
        ├── station/
        ├── data/
        ├── cfg/
        ├── .env.example      # From cfg/<room>/.env.example
        └── models/           # Generated

    After editing source files, re-run `python build.py dev` to update.
    """
    log.info("\n=== Building DEV environment ===")
    log.info(f"SPR root: {SPR_ROOT}")
    log.info(f"Output:   {output_dir}")
    if cfg_name:
        log.info(f"Room cfg: {cfg_name}")

    ensure_dir(output_dir)

    # Soleprint core files
    log.info("\nCopying soleprint files...")
    soleprint = SPR_ROOT / "soleprint"
    copy_path(soleprint / "main.py", output_dir / "main.py")
    copy_path(soleprint / "run.py", output_dir / "run.py")
    copy_path(soleprint / "index.html", output_dir / "index.html")
    copy_path(soleprint / "requirements.txt", output_dir / "requirements.txt")
    copy_path(soleprint / "dataloader", output_dir / "dataloader")
    if (soleprint / "Dockerfile").exists():
        copy_path(soleprint / "Dockerfile", output_dir / "Dockerfile")

    # System directories
    log.info("\nCopying systems...")
    for system in ["artery", "atlas", "station"]:
        source = SPR_ROOT / system
        if source.exists():
            copy_path(source, output_dir / system)

    # Config (includes data/ from room)
    log.info("\nCopying config...")
    copy_cfg(output_dir, cfg_name)

    # Models (generated)
    log.info("\nGenerating models...")
    if not generate_models(output_dir, cfg_name):
        log.warning("Model generation failed, you may need to run it manually")

    log.info("\n✓ Dev build complete!")
    log.info(f"\nTo run:")
    log.info(f"  cd {output_dir}")
    log.info(f"  python3 -m venv .venv")
    log.info(f"  .venv/bin/pip install -r requirements.txt")
    log.info(f"  .venv/bin/python run.py       # Single-port bare-metal dev")
    if cfg_name:
        log.info(
            f"\nAfter editing source, rebuild with: python build.py dev --cfg {cfg_name}"
        )
    else:
        log.info(f"\nAfter editing source, rebuild with: python build.py dev")


def build_deploy(output_dir: Path, cfg_name: str | None = None):
    """
    Build for deployment by copying all files (no symlinks).
    """
    log.info("\n=== Building DEPLOY package ===")
    log.info(f"SPR root: {SPR_ROOT}")
    log.info(f"Output:   {output_dir}")
    if cfg_name:
        log.info(f"Room cfg: {cfg_name}")

    if output_dir.exists():
        response = input(f"\nOutput directory exists. Overwrite? [y/N] ")
        if response.lower() != "y":
            log.info("Aborted.")
            return
        shutil.rmtree(output_dir)

    ensure_dir(output_dir)

    # Soleprint core files (copy)
    log.info("\nCopying soleprint files...")
    soleprint = SPR_ROOT / "soleprint"
    copy_path(soleprint / "main.py", output_dir / "main.py")
    copy_path(soleprint / "run.py", output_dir / "run.py")
    copy_path(soleprint / "index.html", output_dir / "index.html")
    copy_path(soleprint / "requirements.txt", output_dir / "requirements.txt")
    copy_path(soleprint / "dataloader", output_dir / "dataloader")
    if (soleprint / "Dockerfile").exists():
        copy_path(soleprint / "Dockerfile", output_dir / "Dockerfile")

    # System directories (copy)
    log.info("\nCopying systems...")
    for system in ["artery", "atlas", "station"]:
        source = SPR_ROOT / system
        if source.exists():
            copy_path(source, output_dir / system)

    # Config (includes data/ from room)
    log.info("\nCopying config...")
    copy_cfg(output_dir, cfg_name)

    # Models (generate fresh) - pass output_dir, modelgen adds models/pydantic
    log.info("\nGenerating models...")
    if not generate_models(output_dir, cfg_name):
        # Fallback: copy from gen if exists
        room = cfg_name or "standalone"
        existing = SPR_ROOT / "gen" / room / "models"
        if existing.exists():
            log.info("  Using existing models from gen/")
            copy_path(existing, output_dir / "models")

    # Copy schema.json for reference
    log.info("\nCopying schema...")
    copy_path(SPR_ROOT / "schema.json", output_dir / "schema.json")

    # Create run script
    run_script = output_dir / "start.sh"
    run_script.write_text("""#!/bin/bash
# Soleprint runner
cd "$(dirname "$0")"

if [ ! -d ".venv" ]; then
    echo "Creating virtual environment..."
    python3 -m venv .venv
    .venv/bin/pip install -r requirements.txt
fi

echo "Starting soleprint on http://localhost:12000"
.venv/bin/python main.py
""")
    run_script.chmod(0o755)
    log.info("  Created: start.sh")

    total_files = count_files(output_dir)
    log.info(f"\n✓ Deploy build complete! ({total_files} files)")
    log.info(f"\nTo run:")
    log.info(f"  cd {output_dir}")
    log.info(f"  ./start.sh")
    log.info(f"\nOr deploy to server:")
    log.info(f"  rsync -av {output_dir}/ server:/app/soleprint/")
    log.info(f"  ssh server 'cd /app/soleprint && ./start.sh'")


def build_models():
    """Only regenerate models."""
    log.info("\n=== Generating models only ===")

    output_dir = SPR_ROOT / "gen"
    ensure_dir(output_dir)

    if generate_models(output_dir):
        log.info("\n✓ Models generated!")
    else:
        log.error("Model generation failed")
        sys.exit(1)


def main():
    parser = argparse.ArgumentParser(
        description="Soleprint Build Tool",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog=__doc__,
    )

    subparsers = parser.add_subparsers(dest="command", required=True)

    # dev command
    dev_parser = subparsers.add_parser("dev", help="Build for development (copies)")
    dev_parser.add_argument(
        "--output",
        "-o",
        type=Path,
        default=None,
        help="Output directory (default: gen/standalone/ or gen/<cfg>/)",
    )
    dev_parser.add_argument(
        "--cfg",
        "-c",
        type=str,
        default=None,
        help="Room config to include (e.g., 'amar')",
    )
    dev_parser.add_argument(
        "--all",
        action="store_true",
        help="Build all configs (standalone + all rooms in cfg/)",
    )

    # deploy command
    deploy_parser = subparsers.add_parser(
        "deploy", help="Build for deployment (copies)"
    )
    deploy_parser.add_argument(
        "--output",
        "-o",
        type=Path,
        required=True,
        help="Output directory for deployment package",
    )
    deploy_parser.add_argument(
        "--cfg",
        "-c",
        type=str,
        default=None,
        help="Room config to include (e.g., 'amar')",
    )

    # models command
    subparsers.add_parser("models", help="Only regenerate models")

    args = parser.parse_args()

    if args.command == "dev":
        if getattr(args, "all", False):
            # Build standalone
            build_dev(SPR_ROOT / "gen" / "standalone", None)
            # Build all room configs
            cfg_dir = SPR_ROOT / "cfg"
            for room in cfg_dir.iterdir():
                if room.is_dir() and room.name not in ("__pycache__",):
                    build_dev(SPR_ROOT / "gen" / room.name, room.name)
        else:
            # Determine output directory
            if args.output:
                output_dir = args.output.resolve()
            elif args.cfg:
                output_dir = SPR_ROOT / "gen" / args.cfg
            else:
                output_dir = SPR_ROOT / "gen" / "standalone"
            build_dev(output_dir, args.cfg)
    elif args.command == "deploy":
        build_deploy(args.output.resolve(), args.cfg)
    elif args.command == "models":
        build_models()


if __name__ == "__main__":
    main()