import type { EdgeView, GameView, InventoryViewEntry, QuestView } from '@tinywaste/game-core';
import { getEquipmentArt, getItemArt, getStatusArt } from './uiAssets';

export interface EquipmentPreviewEntry {
  id: string;
  label: string;
  title: string;
  subtitle: string;
  art?: string;
  isEquipped: boolean;
}

/** Readiness weights for each survival stat (must sum to 100) */
const READINESS_WEIGHTS = {
  life: 34,
  energy: 28,
  thirst: 20,
  hunger: 18,
} as const;

/** Readiness thresholds for tone classification */
const READINESS_TONE_THRESHOLD_GOOD = 74;
const READINESS_TONE_THRESHOLD_WARN = 48;

/** Risk tier boundaries */
const RISK_LOW_MAX = 0.35;
const RISK_MID_MAX = 0.65;

/** Survivor metric formula constants */
const PROTECTION_BASE_ARMOR = 34;
const PROTECTION_BASE_UNARMORED = 12;
const PROTECTION_STR_FACTOR = 5;
const PROTECTION_LIFE_FACTOR = 30;

const STEALTH_AGI_FACTOR = 8;
const STEALTH_PER_FACTOR = 5;
const STEALTH_SANITY_FACTOR = 20;

const MOBILITY_AGI_FACTOR = 7;
const MOBILITY_ENERGY_FACTOR = 42;
const MOBILITY_LOAD_PENALTY = 18;

const PLACE_ATMOSPHERE: Record<
  string,
  {
    weather: string;
    temperature: string;
    wind: string;
  }
> = {
  home: { weather: 'Light rain', temperature: '18°C', wind: 'Wind 12 km/h' },
  roadside: { weather: 'Cloud break', temperature: '16°C', wind: 'Wind 18 km/h' },
  old_store: { weather: 'Dust drift', temperature: '20°C', wind: 'Wind 9 km/h' },
  village_market: { weather: 'Dry overcast', temperature: '22°C', wind: 'Wind 7 km/h' },
  rain_farm: { weather: 'Wet fog', temperature: '14°C', wind: 'Wind 10 km/h' },
  city_edge: { weather: 'Soot haze', temperature: '19°C', wind: 'Wind 15 km/h' },
  subway_entrance: { weather: 'Cold draft', temperature: '11°C', wind: 'Wind 6 km/h' },
  sewer: { weather: 'Toxic mist', temperature: '13°C', wind: 'Air still' },
  vault_gate: { weather: 'Ash fall', temperature: '9°C', wind: 'Wind 4 km/h' },
};

export function edgeDestination(view: GameView, edge: EdgeView) {
  return view.map.places.find((place) => place.id === edge.to);
}

export function getTimeLabels(timeLabel: string) {
  const timeSegments = timeLabel.split('·').map((part) => part.trim());
  return {
    dayLabel: timeSegments[0] ?? 'Day 1',
    clockLabel: timeSegments[1] ?? timeLabel,
  };
}

export function getActiveQuestCount(view: GameView) {
  return view.quests.filter((quest) => quest.state === 'active').length;
}

export function getAlertCount(view: GameView) {
  return Number(Boolean(view.pendingEvent)) + Number(Boolean(view.combat));
}

export function getDominantAlert(view: GameView) {
  return view.survival.alerts[0] ?? null;
}

export function getCurrentPlace(view: GameView) {
  return view.map.places.find((place) => place.current) ?? null;
}

export function getPlaceAtmosphere(placeId: string) {
  return PLACE_ATMOSPHERE[placeId] ?? { weather: 'Dry static', temperature: '17°C', wind: 'Wind 10 km/h' };
}

export function getLatestLog(view: GameView) {
  return view.logs[0] ?? null;
}

export function getVisibleRoutes(view: GameView, limit = 3) {
  return view.map.edges.slice(0, limit);
}

export function getQuickUseItems(view: GameView, limit = 6) {
  const priority = {
    water: 0,
    food: 1,
    medicine: 2,
    tool: 3,
    material: 4,
    weapon: 5,
    armor: 6,
    ammo: 7,
    quest: 8,
  } as const;

  return [...view.player.inventory]
    .filter((item) => item.canUse)
    .sort((left, right) => {
      const priorityDelta = priority[left.type] - priority[right.type];
      if (priorityDelta !== 0) return priorityDelta;
      return right.count - left.count;
    })
    .slice(0, limit);
}

export function getObjectiveRows(view: GameView) {
  return view.quests
    .filter((quest) => quest.state === 'active' || quest.state === 'completed')
    .map((quest) => {
      const doneCount = quest.steps.filter((step) => step.done).length;
      const nextStep = quest.steps.find((step) => !step.done)?.text ?? quest.steps.at(-1)?.text ?? '待机';

      return {
        id: quest.id,
        title: quest.title,
        detail: nextStep,
        progress: `${doneCount}/${quest.steps.length}`,
        done: quest.state === 'completed',
      };
    });
}

export function getPrimaryObjective(view: GameView) {
  return getObjectiveRows(view)[0] ?? null;
}

export function getAttributeRows(view: GameView) {
  const { attributes } = view.player;

  return [
    { label: 'STR', name: '力量', value: attributes.str },
    { label: 'AGI', name: '敏捷', value: attributes.agi },
    { label: 'INT', name: '智力', value: attributes.int },
    { label: 'PER', name: '感知', value: attributes.per },
    { label: 'LCK', name: '幸运', value: attributes.luck },
  ];
}

export function getStatusEffects(view: GameView) {
  const effects = view.survival.alerts.map((entry) => ({
    id: entry.stat,
    label: `${entry.label} · ${entry.summary}`,
    detail: entry.impact,
    recovery: entry.recovery,
    art: getStatusArt(entry.stat),
    tone:
      entry.tier === 'strained' ? ('warn' as const) : entry.tier === 'safe' ? ('good' as const) : ('danger' as const),
  }));

  if (!effects.length) {
    return [
      {
        id: 'stable',
        label: '稳定',
        detail: '当前幸存者状态平稳，可以继续规划下一步行动。',
        recovery: '保持补给循环与节奏即可。',
        art: getStatusArt('life'),
        tone: 'good' as const,
      },
    ];
  }

  return effects.slice(0, 4);
}

export function getExpeditionStatus(view: GameView) {
  const { stats, maxStats } = view.player;
  const readiness = Math.round(
    (stats.life / maxStats.life) * READINESS_WEIGHTS.life +
      (stats.energy / maxStats.energy) * READINESS_WEIGHTS.energy +
      (stats.thirst / maxStats.thirst) * READINESS_WEIGHTS.thirst +
      (stats.hunger / maxStats.hunger) * READINESS_WEIGHTS.hunger,
  );
  const loadPercent = Math.round((view.player.inventoryUsage / view.player.inventoryCapacity) * 100);
  const threatCount = view.survival.alerts.length;

  return {
    readiness,
    loadPercent,
    threatCount,
    tone: readiness >= READINESS_TONE_THRESHOLD_GOOD && threatCount === 0 ? 'good' : readiness >= READINESS_TONE_THRESHOLD_WARN ? 'warn' : 'danger',
  };
}

export function getSurvivorMetrics(view: GameView) {
  const protection = Math.min(
    100,
    Math.round(
      (view.player.equipment.body ? PROTECTION_BASE_ARMOR : PROTECTION_BASE_UNARMORED) +
        view.player.attributes.str * PROTECTION_STR_FACTOR +
        (view.player.stats.life / view.player.maxStats.life) * PROTECTION_LIFE_FACTOR,
    ),
  );
  const stealth = Math.min(
    100,
    Math.round(
      view.player.attributes.agi * STEALTH_AGI_FACTOR +
        view.player.attributes.per * STEALTH_PER_FACTOR +
        (view.player.stats.sanity / view.player.maxStats.sanity) * STEALTH_SANITY_FACTOR,
    ),
  );
  const mobility = Math.max(
    0,
    Math.min(
      100,
      Math.round(
        view.player.attributes.agi * MOBILITY_AGI_FACTOR +
          (view.player.stats.energy / view.player.maxStats.energy) * MOBILITY_ENERGY_FACTOR -
          (view.player.inventoryUsage / view.player.inventoryCapacity) * MOBILITY_LOAD_PENALTY,
      ),
    ),
  );

  return [
    { id: 'protection', label: '防护', value: protection },
    { id: 'stealth', label: '潜行', value: stealth },
    { id: 'mobility', label: '机动', value: mobility },
  ];
}

export function getSupplyCounts(view: GameView) {
  const counts = {
    water: 0,
    food: 0,
    medicine: 0,
    material: 0,
  };

  for (const item of view.player.inventory) {
    if (item.type === 'water') counts.water += item.count;
    if (item.type === 'food') counts.food += item.count;
    if (item.type === 'medicine') counts.medicine += item.count;
    if (item.type === 'material') counts.material += item.count;
  }

  return counts;
}

export function getKitItem(view: GameView) {
  return view.player.inventory.find((item) => item.type === 'medicine' || item.type === 'water') ?? null;
}

export function getLoadoutEntries(view: GameView) {
  const inventoryById = new Map(view.player.inventory.map((item) => [item.itemId, item]));
  const weaponItem = view.player.equipment.weapon ? inventoryById.get(view.player.equipment.weapon) : undefined;
  const bodyItem = view.player.equipment.body ? inventoryById.get(view.player.equipment.body) : undefined;
  const toolItem = view.player.equipment.tool ? inventoryById.get(view.player.equipment.tool) : undefined;
  const kitItem = getKitItem(view);

  const left: EquipmentPreviewEntry[] = [
    {
      id: 'head',
      label: 'Head',
      title: '遮面兜帽',
      subtitle: '造型预置位',
      art: getEquipmentArt(undefined, 'head'),
      isEquipped: false,
    },
    {
      id: 'body',
      label: 'Body',
      title: bodyItem?.name ?? '未装备护甲',
      subtitle: bodyItem ? '已挂载在躯干槽' : '建议保留一件抗风装备',
      art: getEquipmentArt(bodyItem?.itemId, 'body'),
      isEquipped: Boolean(bodyItem),
    },
    {
      id: 'back',
      label: 'Back',
      title: '远行背包',
      subtitle: `容量 ${view.player.inventoryUsage}/${view.player.inventoryCapacity}`,
      art: getEquipmentArt(undefined, 'back'),
      isEquipped: true,
    },
  ];

  const right: EquipmentPreviewEntry[] = [
    {
      id: 'weapon',
      label: 'Weapon',
      title: weaponItem?.name ?? '未装备主武器',
      subtitle: weaponItem ? '武器槽在线' : '可通过蓝图制作远程装备',
      art: getEquipmentArt(weaponItem?.itemId, 'weapon'),
      isEquipped: Boolean(weaponItem),
    },
    {
      id: 'tool',
      label: 'Tool',
      title: toolItem?.name ?? '未挂载工具',
      subtitle: toolItem ? '工具槽在线' : '撬棍可作为早期万能工具',
      art: getEquipmentArt(toolItem?.itemId, 'tool'),
      isEquipped: Boolean(toolItem),
    },
    {
      id: 'kit',
      label: 'Kit',
      title: kitItem?.name ?? '未配置急救包',
      subtitle: kitItem ? `携带 ${kitItem.count} 件应急补给` : '建议随身携带水或药物',
      art: kitItem ? getItemArt(kitItem.itemId, kitItem.type) : getEquipmentArt(undefined, 'kit'),
      isEquipped: Boolean(kitItem),
    },
  ];

  return { left, right };
}

export function getRouteRiskTier(risk: number) {
  if (risk <= RISK_LOW_MAX) return { label: '低风险', tone: 'safe' as const };
  if (risk <= RISK_MID_MAX) return { label: '中风险', tone: 'warn' as const };
  return { label: '高风险', tone: 'danger' as const };
}

export function getRiskDots(risk: number) {
  const lit = Math.max(1, Math.min(6, Math.round(risk * 6)));
  return Array.from({ length: 6 }, (_, index) => index < lit);
}

export function getInventoryStateLabel(item: InventoryViewEntry) {
  if (item.equipped) return '已装备';
  if (item.canUse) return '可立即使用';
  if (item.equipSlot) return '可挂载';
  return '物资储备';
}

export function getQuestProgress(quest: QuestView) {
  return `${quest.steps.filter((step) => step.done).length}/${quest.steps.length}`;
}