"""Client site template folders under project templates/template_*."""

from __future__ import annotations

from pathlib import Path

from django.conf import settings

CLIENT_TEMPLATES_ROOT = Path(settings.BASE_DIR) / "templates"

COPY_EXCLUDE_DIR_NAMES = frozenset(
    {
        "__MACOSX",
        "Documentation",
        "documentation",
        "node_modules",
        ".git",
        ".next",
        ".gitignore",
    }
)

# Per-folder config: site path relative to templates/template_N/
TEMPLATE_FOLDER_CONFIG: dict[str, dict] = {
    "template_1": {
        "name": "NeuralSync",
        "description": "AI SaaS marketing template with multi-page layout.",
        "site_path": "Main File/NeuralSync",
        "kind": "static_html",
        "supports_basic": True,
        "supports_django": True,
        "brand_tokens": ["NeuralSync"],
        "hero_strings": ["Transform Your Business with AI Powered Solutions"],
    },
    "template_2": {
        "name": "Eventio Conference",
        "description": "Next.js event and conference site (requires npm to run).",
        "site_path": "eventio/eventio-HTML",
        "kind": "nextjs",
        "supports_basic": True,
        "supports_django": True,
        "brand_tokens": ["Eventio", "EVENTIO"],
        "hero_strings": [
            "Global Business Conference",
            "San Francisco, California",
        ],
    },
    "template_3": {
        "name": "Waves Business",
        "description": "Multi-layout business one-page template pack.",
        "site_path": "site",
        "kind": "static_html",
        "supports_basic": True,
        "supports_django": True,
        "brand_tokens": ["Waves", "Welcome to Waves"],
        "hero_strings": ["Welcome to Waves", "A perfect template for both corporate and creative projects."],
    },
    "template_4": {
        "name": "Multipurpose Business",
        "description": "Bootstrap business landing template with services and pricing.",
        "site_path": "site",
        "kind": "static_html",
        "supports_basic": True,
        "supports_django": True,
        "brand_tokens": ["Business template", "multipurpose business template"],
        "hero_strings": ["Business template"],
    },
}


def _auto_detect_site_path(folder: Path) -> str | None:
    site_dir = folder / "site"
    if (site_dir / "index.html").exists():
        return "site"

    candidates: list[tuple[int, str]] = []
    for index_file in folder.rglob("index.html"):
        parts_lower = {part.lower() for part in index_file.parts}
        if "documentation" in parts_lower:
            continue
        rel_parent = index_file.parent.relative_to(folder)
        depth = len(rel_parent.parts)
        candidates.append((depth, str(rel_parent)))

    if not candidates:
        return None

    candidates.sort(key=lambda item: (item[0], len(item[1])))
    return candidates[0][1]


def discover_client_templates() -> list[dict]:
    definitions: list[dict] = []

    for folder in sorted(CLIENT_TEMPLATES_ROOT.glob("template_*")):
        if not folder.is_dir():
            continue

        folder_key = folder.name
        config = TEMPLATE_FOLDER_CONFIG.get(folder_key, {})
        site_path = config.get("site_path") or _auto_detect_site_path(folder)
        if not site_path:
            continue

        source = CLIENT_TEMPLATES_ROOT / folder_key / site_path
        if not source.exists():
            continue

        slug = folder_key.replace("_", "-")
        definitions.append(
            {
                "slug": slug,
                "name": config.get("name", folder_key.replace("_", " ").title()),
                "description": config.get(
                    "description",
                    f"Client template from templates/{folder_key}/",
                ),
                "source_folder": str(Path("templates") / folder_key / site_path),
                "kind": config.get("kind", "static_html"),
                "supports_basic": config.get("supports_basic", True),
                "supports_django": config.get("supports_django", True),
                "brand_tokens": config.get("brand_tokens", []),
                "hero_strings": config.get("hero_strings", []),
                "is_active": True,
            }
        )

    return definitions


def get_template_config(slug: str) -> dict | None:
    for item in discover_client_templates():
        if item["slug"] == slug:
            return item
    return None


def resolve_source_path(source_folder: str) -> Path:
    return Path(settings.BASE_DIR) / source_folder