import {
  findRoomTemplateById,
  findRoomTemplateForLookup,
  findTableByCode,
} from "@/data/contentHelpers";
import type { ContentPack, ExitType, RoomClass } from "@/types/content";
import type { DungeonLevelState, RoomExitState, RoomState } from "@/types/state";

import { lookupTable, type TableLookupResult } from "./tables";
import type { DiceRoller } from "./dice";

export type RoomGenerationOptions = {
  content: ContentPack;
  roomId: string;
  level: number;
  roomTemplateId?: string;
  roomTableCode?: string;
  roomClass?: RoomClass;
  position?: {
    x: number;
    y: number;
  };
  roller?: DiceRoller;
};

export type RoomGenerationResult = {
  room: RoomState;
  lookup?: TableLookupResult;
  templateSource: "direct-template" | "table-lookup";
};

const DEFAULT_ROOM_DIMENSIONS: Record<RoomClass, { width: number; height: number }> = {
  start: { width: 4, height: 4 },
  normal: { width: 4, height: 4 },
  small: { width: 2, height: 3 },
  large: { width: 6, height: 6 },
  special: { width: 4, height: 4 },
  stairs: { width: 4, height: 4 },
};

const DEFAULT_DIRECTIONS = ["north", "east", "south", "west"] as const;

function inferExitType(exitHint?: string): ExitType {
  const normalized = exitHint?.toLowerCase() ?? "";

  if (normalized.includes("reinforced")) {
    return "locked";
  }

  if (normalized.includes("curtain")) {
    return "open";
  }

  if (normalized.includes("archway")) {
    return "open";
  }

  if (normalized.includes("wooden")) {
    return "door";
  }

  return "door";
}

function inferExitCount(roomClass: RoomClass, exitHint?: string) {
  const normalized = exitHint?.toLowerCase() ?? "";

  if (normalized.includes("random")) {
    return roomClass === "large" ? 3 : 2;
  }

  if (normalized.includes("archway")) {
    return roomClass === "large" ? 3 : 2;
  }

  if (roomClass === "small") {
    return 1;
  }

  if (roomClass === "large") {
    return 3;
  }

  return 2;
}

function createExits(
  roomId: string,
  roomClass: RoomClass,
  exitHint?: string,
): RoomExitState[] {
  const exitCount = inferExitCount(roomClass, exitHint);
  const exitType = inferExitType(exitHint);

  return DEFAULT_DIRECTIONS.slice(0, exitCount).map((direction, index) => ({
    id: `${roomId}.exit.${index + 1}`,
    direction,
    exitType,
    discovered: roomClass === "start",
    traversable: true,
  }));
}

export function createRoomStateFromTemplate(
  content: ContentPack,
  roomId: string,
  level: number,
  roomTemplateId: string,
  position = { x: 0, y: 0 },
): RoomState {
  const template = findRoomTemplateById(content, roomTemplateId);
  const dimensions = template.dimensions ?? DEFAULT_ROOM_DIMENSIONS[template.roomClass];
  const exits =
    template.exits?.map((exit, index) => ({
      id: `${roomId}.exit.${index + 1}`,
      direction: exit.direction ?? DEFAULT_DIRECTIONS[index] ?? "north",
      exitType: exit.exitType,
      discovered: template.roomClass === "start",
      traversable: exit.exitType !== "locked",
      destinationLevel: exit.destinationLevel,
    })) ?? createExits(roomId, template.roomClass, template.exitHint);

  return {
    id: roomId,
    level,
    templateId: template.id,
    position,
    dimensions,
    roomClass: template.roomClass,
    exits,
    discovery: {
      generated: true,
      entered: template.roomClass === "start",
      cleared: false,
      searched: false,
    },
    encounter: undefined,
    objects: [],
    notes: [template.text ?? template.title].filter(Boolean),
    flags: [
      `table:${template.tableCode}`,
      `entry:${template.tableEntryKey}`,
      ...(template.unique ? ["unique"] : []),
      ...template.tags,
    ],
  };
}

export function generateRoomFromTable(
  options: RoomGenerationOptions,
): RoomGenerationResult {
  if (!options.roomTableCode) {
    throw new Error("Room table code is required for table-based room generation.");
  }

  const table = findTableByCode(options.content, options.roomTableCode);
  const lookup = lookupTable(table, { roller: options.roller });
  const template = findRoomTemplateForLookup(options.content, lookup);
  const room = createRoomStateFromTemplate(
    options.content,
    options.roomId,
    options.level,
    template.id,
    options.position,
  );

  return {
    room,
    lookup,
    templateSource: "table-lookup",
  };
}

export function generateLevel1StartRoom(
  content: ContentPack,
  roomId = "room.level1.start",
): RoomGenerationResult {
  const room = createRoomStateFromTemplate(content, roomId, 1, "room.level1.entry", {
    x: 0,
    y: 0,
  });

  return {
    room,
    templateSource: "direct-template",
  };
}

export function createLevelShell(level: number): DungeonLevelState {
  return {
    level,
    themeName: level === 1 ? "The Entry" : undefined,
    rooms: {},
    discoveredRoomOrder: [],
    secretDoorUsed: false,
    exhaustedExitSearch: false,
  };
}