import type { Payload, PayloadRequest } from "payload";
import type { Asset, OperationEffect } from "@/payload-types";
import { notifyUser } from "@/lib/notifications";
import { emitGameEvent } from "@/utils/event-log/emit";
import { EventTypes } from "@/utils/event-log/eventTypes";
import { failOperationReservations } from "./allocation";
import { findByIdOrNull } from "./settlementResolve";
import { applyZonePressure, PRESSURE_OUTCOME_DELTAS } from "./territory";
import {
  parseInventoryLossPayload,
  parseObjectivePayload,
  parseOperationEndPayload,
  parsePlayerLine,
} from "./settlementParse";
import {
  MISSION_FAILURE_OUTCOMES,
  SettlementFailure,
} from "./settlementTypes";
import type { LockerFitLine } from "./settlementFit";

/**
 * AAR-fact handlers: inventory loss evidence, objective completion, and
 * operation-end sweeps. These record statistics-only facts (effect row,
 * event log, notification) and never award rewards or mutate inventory.
 */

export async function handleInventoryLoss(
  payload: Payload,
  effect: OperationEffect,
  req?: PayloadRequest,
): Promise<string | null> {
  const parsed = parseInventoryLossPayload(effect.payload);
  if (!parsed.ok) throw new SettlementFailure(parsed.code, parsed.message);
  const loss = parsed.value;
  // Record-only inventory delta: no loss reason, no evidence to record.
  if (!loss.reason) return null;

  const lines: LockerFitLine[] = [];
  for (const raw of loss.items ?? []) {
    const line = parsePlayerLine(raw);
    if (!line.ok) throw new SettlementFailure(line.code, line.message);
    const asset = (await findByIdOrNull(
      payload,
      "assets",
      line.value.assetId,
      req,
    )) as unknown as Asset | null;
    if (!asset) {
      throw new SettlementFailure("unresolved-asset", `Asset #${line.value.assetId} does not exist.`);
    }
    lines.push({ ...line.value, asset });
  }

  // Death-loss rule: evidence only. No locker/HQ mutation and no scoreboard
  // write (the profile XP hook awards XP for ANY scoreboard key, so a
  // scoreboard write would be a reward, which is prohibited).
  if (loss.reason === "death" && loss.actorId) {
    await emitGameEvent(payload, {
      type: EventTypes.PlayerDeath,
      message: `${lines.length} item line(s) recorded as unextracted losses`,
      actor: loss.actorId,
      targetCollection: "users",
      targetId: loss.actorId,
      data: {
        operationId: loss.operationId,
        effectKey: effect.effectKey,
        items: lines.map((line) => ({ assetId: line.assetId, quantity: line.quantity })),
      },
    });
  }
  if (loss.actorId) {
    const total = lines.reduce((sum, line) => sum + line.quantity, 0);
    await notifyUser(payload, {
      userId: loss.actorId,
      type: "operation:death",
      title: loss.reason === "death" ? "KIA: unextracted inventory lost" : "Inventory lost",
      message: `${total.toLocaleString()} item unit(s) recorded as lost (unextracted). No recovery policy applies.`,
      link: "/locker",
    });
  }
  return null;
}

function objectiveName(objective: unknown): string | null {
  if (typeof objective === "string" && objective) return objective;
  if (typeof objective === "object" && objective !== null) {
    const record = objective as Record<string, unknown>;
    if (typeof record.name === "string" && record.name) return record.name;
    if (typeof record.id === "string" && record.id) return record.id;
  }
  return null;
}

export async function handleObjective(
  payload: Payload,
  effect: OperationEffect,
): Promise<string | null> {
  const parsed = parseObjectivePayload(effect.payload);
  if (!parsed.ok) throw new SettlementFailure(parsed.code, parsed.message);
  const objective = parsed.value;
  // AAR only: objective completion never touches inventory.
  if (objective.actorId) {
    const name = objectiveName(objective.objective);
    await notifyUser(payload, {
      userId: objective.actorId,
      type: "operation:objective",
      title: "Objective updated",
      message: name ? `Objective updated: ${name}.` : "An operation objective was updated.",
    });
  }
  return null;
}

export async function handleOperationEnd(
  payload: Payload,
  effect: OperationEffect,
  req?: PayloadRequest,
): Promise<string | null> {
  const parsed = parseOperationEndPayload(effect.payload);
  if (!parsed.ok) throw new SettlementFailure(parsed.code, parsed.message);
  const end = parsed.value;
  const failed = MISSION_FAILURE_OUTCOMES.includes(
    end.outcome as (typeof MISSION_FAILURE_OUTCOMES)[number],
  );
  const notes: string[] = [];
  if (failed) {
    // Mission failure settles only still-reserved rows; it never writes or
    // reverses effects, so recorded extraction deposits stay final.
    const settled = await failOperationReservations(
      payload,
      end.operationId,
      { effectId: effect.id, actorId: end.actorId },
      req,
    );
    notes.push(`mission-failed: settled ${settled} reservation(s)`);
  }

  // Mission-scoped strategic pressure (task 7): an explicit zone on the end
  // payload receives one attributed delta; replays are no-ops by sourceEffect.
  if (end.zoneId != null) {
    const delta = failed ? PRESSURE_OUTCOME_DELTAS.failure : PRESSURE_OUTCOME_DELTAS.success;
    const applied = await applyZonePressure(
      payload,
      {
        zoneId: end.zoneId,
        factionId: end.factionId,
        operationId: end.operationId,
        missionId: end.missionId,
        sourceEffectId: effect.id,
        delta,
        note: `operation ${end.operationId} ended (${end.outcome ?? "unknown outcome"}): pressure ${delta > 0 ? "+" : ""}${delta}`,
      },
      req,
    );
    notes.push(
      applied.created
        ? `zone-pressure ${delta > 0 ? "+" : ""}${delta} on zone #${end.zoneId}`
        : `zone-pressure replay skipped (zone #${end.zoneId})`,
    );
  }

  return notes.length > 0 ? notes.join("; ") : null;
}