"""Typed data contracts for the pricing pipeline.

These mirror the master-tracker columns the Pricing Analyst owns (playbook §11)
and the Definition of Done (playbook §13). Keeping them as pydantic models means
every hop in the LangGraph state machine is validated.
"""
from __future__ import annotations

from enum import Enum

from pydantic import BaseModel, Field


class Decision(str, Enum):
    APPROVED = "APPROVED"        # -> tracker Status "Pricing Approved"
    BLOCKED = "BLOCKED"          # -> tracker Status "Pricing Blocked"
    NEEDS_REVIEW = "NEEDS_REVIEW"


class BuyBoxStatus(str, Enum):
    WON = "WON"                  # we are the Featured Offer
    LOST_PRICE = "LOST_PRICE"    # lost Featured Offer on price
    LOST_ELIGIBILITY = "LOST_ELIGIBILITY"  # lost on account/listing eligibility, not price
    SUPPRESSED = "SUPPRESSED"    # Buy Box hidden entirely (price significantly high)
    UNKNOWN = "UNKNOWN"


class SkuInput(BaseModel):
    """One row read from the master tracker before pricing."""

    sku: str
    asin: str | None = None
    product_name: str = ""
    marketplace: str = "US"
    category: str = ""
    landed_cost: float = Field(..., description="COGS from Inventory Planner, per unit")
    target_price: float = Field(..., description="Proposed / current selling price to evaluate")
    # Optional inputs; if absent we fall back to the fee API / mock.
    fba_fee: float | None = None
    referral_pct: float | None = Field(
        default=None, description="Modeled/negotiated referral fraction, e.g. 0.12"
    )
    dimensions: str | None = None
    weight: str | None = None


class FeeQuote(BaseModel):
    """Normalized per-unit fee/cost breakdown from a data provider at a given price.

    COSMOS fills this from `takehome-calculator`; the mock fills it synthetically.
    Dollar amounts are per unit at `selling_price`.
    """

    selling_price: float
    landed_cost: float                    # COGS (purchase + freight + duty)
    fba_fee: float = 0.0
    referral_amt: float = 0.0             # Amazon referral fee, in dollars
    returns_reserve: float = 0.0
    other_fees: float = 0.0               # inbound placement, low-inventory, EPR, VAT, handling…
    net_takehome: float | None = None     # provider's authoritative net profit/unit, if given
    source: str = "unknown"


class FeeStack(BaseModel):
    """Full per-unit fee stack + derived margin figures (playbook SOP A)."""

    selling_price: float
    landed_cost: float
    fba_fee: float
    referral_pct: float
    referral_amt: float
    returns_reserve: float
    storage_alloc: float
    total_cost: float
    profit: float
    contribution_margin_pct: float
    break_even_price: float
    map_floor: float
    # The referral basis used to derive this stack ("modeled" or "worst_case").
    referral_basis: str = "worst_case"


class CompetitorOffer(BaseModel):
    """One seller offer on the ASIN's Amazon listing (from Apify offers / Buy Box)."""

    seller_name: str = "Unknown seller"
    seller_id: str | None = None
    price: float | None = None
    is_buy_box: bool = False
    condition: str | None = None
    # True when seller_id matches APIFY_SELLER_ID — this is our own offer, not a rival.
    # Our own offers are excluded from the competitive band.
    is_ours: bool = False


class CompetitiveSnapshot(BaseModel):
    """Result of the competitive / Buy Box scan (playbook SOP B)."""

    asin: str | None = None
    buy_box_status: BuyBoxStatus = BuyBoxStatus.UNKNOWN
    buy_box_price: float | None = None
    buy_box_seller_name: str | None = None
    buy_box_seller_id: str | None = None
    competitive_low: float | None = None
    competitive_median: float | None = None
    competitive_high: float | None = None
    is_suppressed: bool = False
    reason: str = ""
    # Named sellers + prices on this ASIN (featured first when present).
    offers: list[CompetitorOffer] = Field(default_factory=list)


class PricingDecision(BaseModel):
    """The proposal presented to the human and (on approval) written to the tracker."""

    sku: str
    asin: str | None = None
    decision: Decision
    recommended_price: float
    fee_stack: FeeStack
    competitive: CompetitiveSnapshot
    # Deterministic gate reasons (from evaluate node).
    gate_reasons: list[str] = Field(default_factory=list)
    # LLM-written, human-readable narrative (rationale node).
    rationale: str = ""
    competitor_summary: str = ""
    suppression_note: str = ""
    recommended_action: str = ""

    def tracker_row(self) -> dict:
        """Map to the master-tracker columns this role owns (playbook §11)."""
        fs = self.fee_stack
        status = {
            Decision.APPROVED: "Pricing Approved",
            Decision.BLOCKED: "Pricing Blocked",
            Decision.NEEDS_REVIEW: "Pricing Review",
        }[self.decision]
        return {
            "SKU": self.sku,
            "ASIN": self.asin or "",
            "Landed Cost": round(fs.landed_cost, 2),
            "FBA Fee": round(fs.fba_fee, 2),
            "Referral Fee %": round(fs.referral_pct * 100, 2),
            "Referral Fee $": round(fs.referral_amt, 2),
            "Break-even Price": round(fs.break_even_price, 2),
            "MAP Floor": round(fs.map_floor, 2),
            "Target Selling Price": round(self.recommended_price, 2),
            "Contribution Margin %": round(fs.contribution_margin_pct * 100, 2),
            "Buy Box Status": self.competitive.buy_box_status.value,
            "Buy Box Seller": self.competitive.buy_box_seller_name or "",
            "Buy Box Price": (
                round(self.competitive.buy_box_price, 2)
                if self.competitive.buy_box_price is not None else ""
            ),
            "Competitor Offers": "; ".join(
                f"{o.seller_name} @ "
                f"{('$' + format(o.price, '.2f')) if o.price is not None else 'n/a'}"
                + (" [BB]" if o.is_buy_box else "")
                for o in self.competitive.offers[:8]
            ),
            "Suppression Risk": "YES" if self.competitive.is_suppressed else "NO",
            "Status": status,
        }


class LlmNarrative(BaseModel):
    """Structured output schema the LLM must return (no numbers invented here)."""

    rationale: str
    competitor_summary: str
    suppression_note: str
    recommended_action: str