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

Generates soleprint instances from source + room config.

Usage:
    python build.py                    # Build gen/standalone/
    python build.py --cfg <room>       # Build gen/<room>/
    python build.py --all              # Build all rooms
    python build.py --output /path/    # Build to custom path
    python build.py --models           # Only regenerate models

Generated structure for standalone rooms:
    gen/standalone/
        artery/, atlas/, station/, main.py, ...

Generated structure for managed rooms:
    gen/<room>/
        <managed_name>/      # Copied repos + ctrl
        link/                # Bridge code
        soleprint/           # Soleprint instance
"""

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

SPR_ROOT = Path(__file__).resolve().parent

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


def load_config(cfg_name: str | None) -> dict:
    """Load room config.json."""
    room = cfg_name or "standalone"
    config_path = SPR_ROOT / "cfg" / room / "config.json"
    if config_path.exists():
        return json.loads(config_path.read_text())
    return {}


def ensure_dir(path: Path):
    path.mkdir(parents=True, exist_ok=True)


def copy_path(source: Path, target: Path, quiet: bool = False):
    """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)
        if not quiet:
            log.info(f"  {target.name}/")
    else:
        shutil.copy2(source, target)
        if not quiet:
            log.info(f"  {target.name}")


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


def merge_into(source: Path, target: Path):
    """Merge source directory into target (additive, overwrites conflicts)."""
    if not source.exists():
        return
    for item in source.rglob("*"):
        if item.is_file():
            rel = item.relative_to(source)
            dest = target / rel
            dest.parent.mkdir(parents=True, exist_ok=True)
            shutil.copy2(item, dest)


def parse_gitignore(gitignore_path: Path) -> set[str]:
    """Parse .gitignore and return set of patterns to ignore."""
    patterns = set()
    if not gitignore_path.exists():
        return patterns

    for line in gitignore_path.read_text().splitlines():
        line = line.strip()
        # Skip comments and empty lines
        if not line or line.startswith("#"):
            continue
        # Remove trailing slashes (directory indicators)
        pattern = line.rstrip("/")
        # Skip negation patterns (we don't support them)
        if pattern.startswith("!"):
            continue
        patterns.add(pattern)
    return patterns


def copy_repo(source: Path, target: Path):
    """Copy a repo directory, excluding .git and gitignored files."""
    if not source.exists():
        log.warning(f"Repo not found: {source}")
        return False

    # Always ignore these
    always_ignore = {".git", "__pycache__", "node_modules", ".venv", "venv", ".env"}

    # Parse .gitignore from repo root
    gitignore_patterns = parse_gitignore(source / ".gitignore")

    def ignore_patterns(directory, files):
        ignored = set()
        rel_dir = Path(directory).relative_to(source)

        for f in files:
            # Always ignore these
            if f in always_ignore:
                ignored.add(f)
                continue

            # Check gitignore patterns
            rel_path = rel_dir / f if str(rel_dir) != "." else Path(f)

            for pattern in gitignore_patterns:
                # Simple pattern matching (filename or extension)
                if pattern.startswith("*."):
                    # Extension pattern like *.pyc
                    if f.endswith(pattern[1:]):
                        ignored.add(f)
                        break
                elif pattern == f or pattern == str(rel_path):
                    # Exact match
                    ignored.add(f)
                    break
                elif "/" not in pattern and f == pattern:
                    # Simple name match anywhere
                    ignored.add(f)
                    break

        return ignored

    shutil.copytree(source, target, ignore=ignore_patterns, symlinks=False)
    return True


def build_managed(output_dir: Path, cfg_name: str, config: dict):
    """Build managed folder with repos + ctrl."""
    managed = config.get("managed", {})
    managed_name = managed.get("name", cfg_name)
    repos = managed.get("repos", {})

    managed_dir = output_dir / managed_name
    ensure_dir(managed_dir)

    log.info(f"Building managed ({managed_name})...")

    # Copy repos
    for repo_name, repo_path in repos.items():
        source = Path(repo_path)
        target = managed_dir / repo_name
        if copy_repo(source, target):
            log.info(f"  {repo_name}/")

    room_cfg = SPR_ROOT / "cfg" / cfg_name

    # Docker files from room root -> managed root
    for item in room_cfg.iterdir():
        if item.is_file() and (
            item.name.startswith("Dockerfile") or item.name.startswith("docker-compose")
        ):
            copy_path(item, managed_dir / item.name)

    # Scripts from ctrl/ -> managed/ctrl/
    room_ctrl = room_cfg / "ctrl"
    if room_ctrl.exists():
        ctrl_dir = managed_dir / "ctrl"
        ensure_dir(ctrl_dir)
        for item in room_ctrl.iterdir():
            if item.is_file():
                copy_path(item, ctrl_dir / item.name)


def build_link(output_dir: Path, cfg_name: str):
    """Build link folder."""
    room_cfg = SPR_ROOT / "cfg" / cfg_name
    link_source = room_cfg / "link"

    if not link_source.exists():
        return

    log.info("Building link...")
    link_dir = output_dir / "link"
    copy_path(link_source, link_dir)


def generate_models(output_dir: Path, room: str):
    """Generate models using modelgen tool."""
    config_path = SPR_ROOT / "cfg" / room / "config.json"

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

    models_file = output_dir / "models" / "pydantic" / "__init__.py"
    models_file.parent.mkdir(parents=True, exist_ok=True)

    cmd = [
        sys.executable,
        "-m",
        "soleprint.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, room: str):
    """Copy room configuration files to output directory."""
    room_cfg = SPR_ROOT / "cfg" / room

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

    log.info(f"Copying {room} config...")

    # config.json -> cfg/
    cfg_dir = output_dir / "cfg"
    ensure_dir(cfg_dir)
    if (room_cfg / "config.json").exists():
        copy_path(room_cfg / "config.json", cfg_dir / "config.json")

    # data/ -> data/
    if (room_cfg / "data").exists():
        copy_path(room_cfg / "data", output_dir / "data")

    # .env.example
    if (room_cfg / ".env.example").exists():
        copy_path(room_cfg / ".env.example", output_dir / ".env.example")

    # Room-specific soleprint config (docker-compose.yml, etc)
    # Now in cfg/<room>/soleprint/
    room_soleprint = room_cfg / "soleprint"
    if room_soleprint.exists():
        for item in room_soleprint.iterdir():
            if item.is_file():
                copy_path(item, output_dir / item.name)

        # Merge room-specific system configs from soleprint subfolder
        for system in ["artery", "atlas", "station"]:
            room_system = room_soleprint / system
            if room_system.exists():
                log.info(f"  Merging {room} {system}...")
                merge_into(room_system, output_dir / system)


def build_soleprint(output_dir: Path, room: str):
    """Build soleprint folder with core + room config merged."""
    soleprint = SPR_ROOT / "soleprint"

    # Soleprint core files
    log.info("Copying soleprint core...")
    for name in [
        "main.py",
        "run.py",
        "index.html",
        "requirements.txt",
        "Dockerfile",
    ]:
        if (soleprint / name).exists():
            copy_path(soleprint / name, output_dir / name)
    copy_path(soleprint / "dataloader", output_dir / "dataloader")

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

    # Room config (includes merging room-specific artery/atlas/station)
    copy_cfg(output_dir, room)

    # Generate models
    log.info("Generating models...")
    if not generate_models(output_dir, room):
        log.warning("Model generation failed")


def build(output_dir: Path, cfg_name: str | None = None):
    """Build complete room instance."""
    room = cfg_name or "standalone"
    config = load_config(cfg_name)
    managed = config.get("managed")

    log.info(f"\n=== Building {room} ===")
    ensure_dir(output_dir)

    if managed:
        # 3-folder structure: <managed>/, link/, soleprint/
        build_managed(output_dir, room, config)
        build_link(output_dir, room)

        soleprint_name = config.get("framework", {}).get("name", "soleprint")
        soleprint_dir = output_dir / soleprint_name
        ensure_dir(soleprint_dir)
        build_soleprint(soleprint_dir, room)
    else:
        # Standalone: everything in output_dir
        build_soleprint(output_dir, room)

    log.info(f"\n✓ Built: {output_dir}")


def build_models_only():
    """Only regenerate models."""
    log.info("Generating models...")
    if generate_models(SPR_ROOT / "gen"):
        log.info("✓ Models generated")
    else:
        log.error("Model generation failed")
        sys.exit(1)


def main():
    parser = argparse.ArgumentParser(description="Soleprint Build Tool")

    parser.add_argument("--output", "-o", type=Path, help="Output directory")
    parser.add_argument("--cfg", "-c", type=str, help="Room config name")
    parser.add_argument("--all", action="store_true", help="Build all rooms")
    parser.add_argument("--models", action="store_true", help="Only regenerate models")

    args = parser.parse_args()

    if args.models:
        build_models_only()
    elif args.all:
        build(SPR_ROOT / "gen" / "standalone", None)
        for room in (SPR_ROOT / "cfg").iterdir():
            if room.is_dir() and room.name not in ("__pycache__", "standalone"):
                build(SPR_ROOT / "gen" / room.name, room.name)
    else:
        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(output_dir, args.cfg)


if __name__ == "__main__":
    main()