"""Typed board model produced by parsing a Specctra DSN file.

These dataclasses are the Python analogue of the data that FreeRouting's
``io/specctra/parser`` scope readers accumulate before constructing a
``RoutingBoard``. They stay at the DSN level (names, raw coordinates in DSN
units) — turning them into board geometry is a later port stage.
"""

from __future__ import annotations

from dataclasses import dataclass, field

from .shapes import Area, Shape

__all__ = [
    "ParserInfo",
    "Resolution",
    "Layer",
    "WidthRule",
    "ClearanceRule",
    "StructureRules",
    "Padstack",
    "Pin",
    "Image",
    "ComponentPlace",
    "ComponentPlacement",
    "NetPin",
    "Net",
    "NetClass",
    "Keepout",
    "DsnBoard",
]


@dataclass
class ParserInfo:
    """The ``(parser ...)`` scope."""

    string_quote: str = '"'
    host_cad: str | None = None
    host_version: str | None = None
    constants: list[tuple[str, str]] = field(default_factory=list)
    generated_by_freerouting: bool = False


@dataclass
class Resolution:
    """The ``(resolution <unit> <value>)`` scope. Defaults match FreeRouting."""

    unit: str = "mil"
    value: int = 100


@dataclass
class Layer:
    """A ``(layer ...)`` entry. ``index`` is the physical layer number, 0 = top."""

    name: str
    index: int
    is_signal: bool = True
    net_names: list[str] = field(default_factory=list)


@dataclass
class WidthRule:
    value: float


@dataclass
class ClearanceRule:
    value: float
    #: class-pair names from ``(type a-b)`` / ``(type smd_smd)``; empty = default
    class_pairs: list[str] = field(default_factory=list)


@dataclass
class StructureRules:
    """The default ``(rule ...)`` block plus control/snap settings."""

    width_rules: list[WidthRule] = field(default_factory=list)
    clearance_rules: list[ClearanceRule] = field(default_factory=list)


@dataclass
class Padstack:
    """A ``(padstack ...)`` — one or more per-layer pad shapes plus flags."""

    name: str
    shapes: list[Shape] = field(default_factory=list)
    attach_allowed: bool = True
    placed_absolute: bool = False


@dataclass
class Pin:
    """A pin within an image: ``(pin <padstack> [ (rotate d) ] <name> x y)``."""

    padstack_name: str
    name: str
    x: float
    y: float
    rotation: float = 0.0


@dataclass
class Image:
    """A ``(image ...)`` — a component footprint definition."""

    name: str
    is_front: bool = True
    pins: list[Pin] = field(default_factory=list)
    outlines: list[Shape] = field(default_factory=list)
    keepouts: list[Area] = field(default_factory=list)
    via_keepouts: list[Area] = field(default_factory=list)
    wire_keepouts: list[Area] = field(default_factory=list)
    place_keepouts: list[Area] = field(default_factory=list)


@dataclass
class ComponentPlace:
    """One placed instance: ``(place <refdes> x y front|back rot ...)``.

    ``x`` / ``y`` are ``None`` when the component is declared but not yet placed.
    """

    name: str
    x: float | None = None
    y: float | None = None
    is_front: bool = True
    rotation: float = 0.0
    position_fixed: bool = False
    part_number: str | None = None


@dataclass
class ComponentPlacement:
    """A ``(component <libname> (place ...) ...)`` group."""

    lib_name: str
    places: list[ComponentPlace] = field(default_factory=list)


@dataclass
class NetPin:
    """A ``Comp-Pin`` reference inside a net's ``(pins ...)`` list."""

    component: str
    pin: str


@dataclass
class Net:
    """A ``(net <name> [subnet] (pins ...))`` entry."""

    name: str
    subnet: int = 1
    pins: list[NetPin] = field(default_factory=list)


@dataclass
class NetClass:
    """A ``(class <name> net... (circuit (use_via ...)) (rule ...))`` entry."""

    name: str
    net_names: list[str] = field(default_factory=list)
    width_rules: list[WidthRule] = field(default_factory=list)
    clearance_rules: list[ClearanceRule] = field(default_factory=list)
    use_via: list[str] = field(default_factory=list)
    use_layer: list[str] = field(default_factory=list)
    via_rule: str | None = None


@dataclass
class Plane:
    """A ``(plane <net> <shape>)``: a copper zone of that net (KiCad's zones)."""

    net: str
    shape: Shape


@dataclass
class Keepout:
    """A structure-level keepout area with its kind."""

    area: Area
    kind: str = "keepout"  # keepout | via_keepout | wire_keepout | place_keepout


@dataclass
class DsnBoard:
    """The fully parsed DSN file."""

    name: str = ""
    parser: ParserInfo = field(default_factory=ParserInfo)
    resolution: Resolution = field(default_factory=Resolution)
    unit: str = "mil"
    layers: list[Layer] = field(default_factory=list)
    #: copper zones, as planes of a net
    planes: list[Plane] = field(default_factory=list)
    #: bounding-box boundary shape (layer ``pcb``), if present
    boundary: Shape | None = None
    #: outline shapes (layer ``signal``)
    outlines: list[Shape] = field(default_factory=list)
    via_padstack_names: list[str] = field(default_factory=list)
    structure_rules: StructureRules = field(default_factory=StructureRules)
    snap_angle: str = "fortyfive_degree"
    via_at_smd_allowed: bool = False
    keepouts: list[Keepout] = field(default_factory=list)
    padstacks: list[Padstack] = field(default_factory=list)
    images: list[Image] = field(default_factory=list)
    placements: list[ComponentPlacement] = field(default_factory=list)
    nets: list[Net] = field(default_factory=list)
    net_classes: list[NetClass] = field(default_factory=list)

    # Convenience lookups -----------------------------------------------------
    def layer_names(self) -> list[str]:
        return [layer.name for layer in self.layers]

    def net(self, name: str) -> Net | None:
        for n in self.nets:
            if n.name == name:
                return n
        return None

    def padstack(self, name: str) -> Padstack | None:
        for p in self.padstacks:
            if p.name == name:
                return p
        return None