from __future__ import annotations

from enum import Enum
from typing import Any

from pydantic import BaseModel, Field


class ComponentCategory(str, Enum):
    capacitor = "capacitor"
    resistor = "resistor"
    inductor = "inductor"
    diode = "diode"
    led = "led"
    ic = "ic"
    connector = "connector"
    crystal = "crystal"
    mosfet = "mosfet"
    sensor = "sensor"
    other = "other"


class RowState(str, Enum):
    pending = "pending"
    scouting = "scouting"
    filtering = "filtering"
    confirmed = "confirmed"
    flagged = "flagged"


class NormalizedParams(BaseModel):
    package: str | None = None
    value: float | None = None       # SI base: F / Ω / H / Hz
    value_str: str | None = None     # human-readable: "100nF", "10kΩ"
    unit: str | None = None          # "F" | "Ω" | "H" | "Hz"
    voltage_rating: float | None = None
    current_rating: float | None = None
    power_rating: float | None = None
    tolerance: str | None = None     # "5%", "10ppm"
    part_number: str | None = None   # MPN if found in BOM
    manufacturer: str | None = None


class BomRow(BaseModel):
    row_id: str
    designators: list[str] = Field(default_factory=list)
    quantity: int = 1
    raw_value: str
    footprint: str | None = None
    category: ComponentCategory
    normalized_params: NormalizedParams
    state: RowState = RowState.pending
    applied_filters: dict[str, Any] = Field(default_factory=dict)
    facet_groups: dict[str, Any] = Field(default_factory=dict)
    confirmed_pick: dict[str, Any] | None = None
    scout_candidates: list[dict[str, Any]] | None = None


class BomSession(BaseModel):
    session_id: str
    created_at: str
    filename: str
    preferred_suppliers: list[str] = Field(default_factory=list)
    rows: list[BomRow] = Field(default_factory=list)