"""Randarea etichetelor de produs finit si contractul de printare.

Eticheta este generata din designul vizual (blocuri in milimetri) si contine:
  - denumirea produsului finit si greutatea totala
  - defalcarea pe componente (ex. 250 g Fasole, 200 g Carne)
  - lot, data, operator
"""
from __future__ import annotations

from datetime import datetime
from typing import Any, Optional

from . import designer
from .repositories import ValidationError, list_label_fields
from .units import format_weight as _format_weight


def _format_datetime(value: Any, fmt: str = "%d.%m.%Y %H:%M") -> str:
    if not value:
        return ""
    try:
        return datetime.fromisoformat(str(value)).strftime(fmt)
    except (TypeError, ValueError):
        return str(value)


class LabelTemplateError(ValidationError):
    pass


def sample_package() -> dict[str, Any]:
    now = datetime.now().astimezone().isoformat(timespec="seconds")
    return {
        "id": 0,
        "created_at": now,
        "completed_at": now,
        "status": "done",
        "recipe_code": "PF-DEMO",
        "recipe_name": "Fasole cu carne",
        "unit": "g",
        "target_weight": 450,
        "total_weight": 450,
        "lot": "LOT-DEMO",
        "operator": "Operator",
        "notes": "",
        "print_count": 0,
        "items": [
            {"position": 1, "component_name": "Fasole", "weight": 250, "unit": "g"},
            {"position": 2, "component_name": "Carne", "weight": 200, "unit": "g"},
        ],
    }


def sample_recipe() -> dict[str, Any]:
    return {
        "id": 0,
        "code": "PF-DEMO",
        "name": "Fasole cu carne",
        "unit": "g",
        "target_weight": 450,
        "note": "",
        "components": [
            {"position": 1, "name": "Fasole", "code": "FAS", "target_weight": 250},
            {"position": 2, "name": "Carne", "code": "CAR", "target_weight": 200},
        ],
    }


def build_context(
    package: dict[str, Any],
    items: list[dict[str, Any]],
    recipe: Optional[dict[str, Any]],
    settings: dict[str, str],
    template: Optional[dict[str, Any]] = None,
) -> dict[str, Any]:
    """Contextul vechi Jinja, pastrat pentru compatibilitate cu integrarile existente."""
    return {
        "package": package,
        "items": items,
        "recipe": recipe or {
            "id": None,
            "code": package.get("recipe_code", ""),
            "name": package.get("recipe_name", ""),
            "unit": package.get("unit", ""),
            "components": [],
        },
        "company": {
            "name": settings.get("company_name", ""),
            "address": settings.get("company_address", ""),
            "phone": settings.get("company_phone", ""),
        },
        "label": {
            "width_mm": float((template or {}).get("width_mm", 100)),
            "height_mm": float((template or {}).get("height_mm", 60)),
        },
        "settings": settings,
    }


def design_for(template: dict[str, Any]) -> dict[str, Any]:
    """Designul sablonului; daca lipseste (sablon vechi), se foloseste cel implicit."""
    width = float(template.get("width_mm") or 100)
    height = float(template.get("height_mm") or 60)
    design = designer.load_design(template.get("design_json") or "", width, height)
    if design is None:
        return designer.default_design(width, height)
    return design


def render_body(
    template: dict[str, Any],
    package: dict[str, Any],
    items: Optional[list[dict[str, Any]]] = None,
    recipe: Optional[dict[str, Any]] = None,
    settings: Optional[dict[str, str]] = None,
) -> str:
    item_list = items if items is not None else package.get("items") or []
    design = design_for(template)
    fields = designer.resolve_fields(package, item_list, recipe, settings or {})
    fields = designer.apply_custom_fields(fields, list_label_fields())
    return designer.render_design(design, fields, item_list)


def template_css(template: dict[str, Any]) -> str:
    css = template.get("css") or ""
    return f"{designer.DESIGN_CSS}\n{css}".strip()


def validate_template(template: dict[str, Any], settings: Optional[dict[str, str]] = None) -> None:
    """Revalideaza designul si il randeaza cu date demo, ca sa prindem erorile."""
    design = designer.validate_design(
        design_for(template),
        float(template.get("width_mm") or 100),
        float(template.get("height_mm") or 60),
    )
    demo = designer.apply_custom_fields(designer.demo_fields(), list_label_fields())
    designer.render_design(design, demo, designer.demo_items())


def print_payload(
    package: dict[str, Any],
    template: dict[str, Any],
    settings: dict[str, str],
    recipe: Optional[dict[str, Any]] = None,
) -> dict[str, Any]:
    items = package.get("items") or []
    html = render_body(template, package, items, recipe, settings)
    breakdown = ", ".join(
        f"{_format_weight(item['weight'])} {item['unit']} {item['component_name']}"
        for item in items
    )
    return {
        "job_id": f"p{package['id']}-{int(package.get('print_count') or 0) + 1}",
        "package_id": package["id"],
        "template": {
            "id": template["id"],
            "name": template["name"],
            "width_mm": float(template["width_mm"]),
            "height_mm": float(template["height_mm"]),
        },
        "html": html,
        "css": template_css(template),
        "fields": {
            "recipe_code": package.get("recipe_code", ""),
            "recipe_name": package.get("recipe_name", ""),
            "lot": package.get("lot", ""),
            "operator": package.get("operator", ""),
            "total_weight": _format_weight(package.get("total_weight")),
            "unit": package.get("unit", ""),
            "completed_at": package.get("completed_at", ""),
            "breakdown": breakdown,
        },
        "print_url": f"/labels/{package['id']}/print",
        "ack_url": f"/api/packages/{package['id']}/printed",
    }