import {
  buildBodyPath,
  buildMedievalAtlasSpec,
  buildRaceAssetPath,
  clampMedievalAtlasFrame,
  getMedievalAtlasOptions,
  getMedievalPoseOptions,
  MEDIEVAL_BODY_COLORS,
  type MedievalAtlasSourceType,
  type MedievalNpcVisualOverride,
  type MedievalRace,
} from '../data/medievalNpcVisuals';
import type { Encounter } from '../types';
import { type NpcLayoutConfig, type NpcLayoutPart } from './npcVisualShared';

export type GearSourceType = 'none' | MedievalAtlasSourceType;

export type EditableNpcVisualState = {
  race: MedievalRace;
  bodyColor: string;
  headIndex: number;
  hairColorIndex: number;
  hairStyleFrame: number;
  facialHairEnabled: boolean;
  facialHairColorIndex: number;
  facialHairStyleFrame: number;
  headgearType: GearSourceType;
  headgearFile: string;
  headgearFrame: number;
  mainHandType: GearSourceType;
  mainHandFile: string;
  mainHandFrame: number;
  offHandType: GearSourceType;
  offHandFile: string;
  offHandFrame: number;
};

export type EditorNpcOption = {
  encounter: Encounter;
  sceneNames: string[];
};

const NPC_LAYOUT_PARTS: NpcLayoutPart[] = [
  'body',
  'head',
  'facialHair',
  'hair',
  'headgear',
  'hand',
  'mainHand',
  'offHand',
];

export function sanitizeFrameSelection(
  type: GearSourceType,
  file: string,
  frame: number,
  usage: 'headgear' | 'mainHand' | 'offHand',
) {
  if (type === 'none' || !file) return 0;
  const poseOptions = getMedievalPoseOptions(type, file, usage);
  if (poseOptions.length === 0) return 0;
  if (poseOptions.some(option => option.value === frame)) {
    return clampMedievalAtlasFrame(type, file, frame);
  }
  const firstOption = poseOptions[0];
  return firstOption ? firstOption.value : 0;
}

export function getDefaultFileForType(type: GearSourceType) {
  if (type === 'none') return '';
  return getMedievalAtlasOptions(type)[0]?.file ?? '';
}

export function getDefaultFrameForSelection(
  type: GearSourceType,
  file: string,
  usage: 'headgear' | 'mainHand' | 'offHand',
) {
  if (type === 'none' || !file) return 0;
  return getMedievalPoseOptions(type, file, usage)[0]?.value ?? 0;
}

export function isRecord(value: unknown): value is Record<string, unknown> {
  return Boolean(value) && typeof value === 'object' && !Array.isArray(value);
}

export function isNpcLayoutConfig(value: unknown): value is NpcLayoutConfig {
  return (
    isRecord(value)
    && NPC_LAYOUT_PARTS.every(part => {
      const coordinate = value[part];
      return (
        isRecord(coordinate)
        && typeof coordinate.x === 'number'
        && Number.isFinite(coordinate.x)
        && typeof coordinate.y === 'number'
        && Number.isFinite(coordinate.y)
      );
    })
  );
}

export function buildOverrideFromEditorState(
  state: EditableNpcVisualState,
): MedievalNpcVisualOverride {
  return {
    race: state.race,
    bodySrc: buildBodyPath(
      state.bodyColor as (typeof MEDIEVAL_BODY_COLORS)[number],
    ),
    headSrc: buildRaceAssetPath(state.race, 'head', state.headIndex),
    hairSrc: buildRaceAssetPath(state.race, 'hair', state.hairColorIndex),
    handSrc: buildRaceAssetPath(state.race, 'hand', 1),
    facialHairSrc: state.facialHairEnabled
      ? buildRaceAssetPath(state.race, 'facialHair', state.facialHairColorIndex)
      : undefined,
    headgear:
      state.headgearType === 'none'
        ? undefined
        : buildMedievalAtlasSpec(
            state.headgearType,
            state.headgearFile,
            sanitizeFrameSelection(
              state.headgearType,
              state.headgearFile,
              state.headgearFrame,
              'headgear',
            ),
          ),
    mainHand:
      state.mainHandType === 'none'
        ? undefined
        : buildMedievalAtlasSpec(
            state.mainHandType,
            state.mainHandFile,
            sanitizeFrameSelection(
              state.mainHandType,
              state.mainHandFile,
              state.mainHandFrame,
              'mainHand',
            ),
          ),
    offHand:
      state.offHandType === 'none'
        ? undefined
        : buildMedievalAtlasSpec(
            state.offHandType,
            state.offHandFile,
            sanitizeFrameSelection(
              state.offHandType,
              state.offHandFile,
              state.offHandFrame,
              'offHand',
            ),
          ),
    bodyFrames: [0, 1, 2, 3],
    headFrame: 0,
    hairFrame: state.hairStyleFrame,
    handFrame: 0,
    facialHairFrame: state.facialHairEnabled
      ? state.facialHairStyleFrame
      : undefined,
  };
}

export function buildNpcVisualSavePayload(
  overrideMap: Record<string, MedievalNpcVisualOverride>,
  npcId: string,
  editorState: EditableNpcVisualState,
) {
  return {
    ...overrideMap,
    [npcId]: buildOverrideFromEditorState(editorState),
  };
}