import { db } from './index';
import type { PicletInstance, BattleMove } from './schema';
import { PicletType, AttackType, getTypeFromConcept } from '../types/picletTypes';
import type { PicletStats } from '../types';
import { generateUnlockLevels } from '../services/unlockLevels';

// Interface for generated piclet data (from PicletResult component)
interface GeneratedPicletData {
  name: string;
  imageUrl: string;
  imageData?: string;
  imageCaption: string;
  concept: string;
  imagePrompt: string;
  stats: PicletStats;
  createdAt: Date;
}

// Convert generated piclet data to a PicletInstance
export async function generatedDataToPicletInstance(data: GeneratedPicletData, level: number = 5): Promise<Omit<PicletInstance, 'id'>> {
  if (!data.stats) {
    throw new Error('Generated data must have stats to create PicletInstance');
  }

  // All generated data must now have the battle-ready format
  const stats = data.stats as PicletStats;
  
  if (!stats.baseStats || !stats.specialAbility || !stats.movepool) {
    throw new Error('Generated stats must be in battle-ready format with baseStats, specialAbility, and movepool');
  }
  
  // Calculate base stats from battle-ready format
  const baseHp = Math.floor(stats.baseStats.hp * 2 + 50);
  const baseAttack = Math.floor(stats.baseStats.attack * 1.5 + 30);
  const baseDefense = Math.floor(stats.baseStats.defense * 1.5 + 30);
  const baseSpeed = Math.floor(stats.baseStats.speed * 1.5 + 30);
  
  // Determine primary type from battle stats
  const normalizedType = stats.primaryType.toLowerCase();
  const validType = Object.values(PicletType).find(type => type === normalizedType);
  const primaryType = validType || getTypeFromConcept(data.concept, data.imageCaption);
  
  if (!validType) {
    console.warn(`Invalid primaryType "${stats.primaryType}" from stats, falling back to concept detection`);
  }

  // Create moves from battle-ready format (without unlock levels initially)
  const baseMoves: BattleMove[] = stats.movepool.map(move => ({
    name: move.name,
    type: move.type as unknown as AttackType,
    power: move.power,
    accuracy: move.accuracy,
    pp: move.pp,
    currentPp: move.pp,
    description: move.description,
    unlockLevel: 1 // Temporary, will be set below
  }));
  
  // Generate unlock levels for moves and special ability
  const { movesWithUnlocks, abilityUnlockLevel } = generateUnlockLevels(baseMoves, stats.specialAbility);
  const moves = movesWithUnlocks;
  
  // Field stats are variations of regular stats
  const baseFieldAttack = Math.floor(baseAttack * 0.8);
  const baseFieldDefense = Math.floor(baseDefense * 0.8);
  
  // Use Pokemon-accurate stat calculations (matching levelingService)
  const calculateStat = (base: number, level: number) => {
    if (level === 1) {
      return Math.max(1, Math.floor(base / 10) + 5);
    }
    return Math.floor((2 * base * level) / 100) + 5;
  };
  
  const calculateHp = (base: number, level: number) => {
    if (level === 1) {
      return Math.max(1, Math.floor(base / 10) + 11);
    }
    return Math.floor((2 * base * level) / 100) + level + 10;
  };
  
  const maxHp = calculateHp(baseHp, level);
  
  const bst = baseHp + baseAttack + baseDefense + baseFieldAttack + baseFieldDefense + baseSpeed;
  
  // Check if this is the first piclet (no existing piclets in database)
  const existingPiclets = await db.picletInstances.count();
  const isFirstPiclet = existingPiclets === 0;
  
  return {
    // Type Info
    typeId: data.name.toLowerCase().replace(/\s+/g, '-'),
    nickname: data.name,
    primaryType: primaryType,
    secondaryType: undefined,
    
    // Current Stats
    currentHp: maxHp,
    maxHp,
    level,
    xp: 0,
    attack: calculateStat(baseAttack, level),
    defense: calculateStat(baseDefense, level),
    fieldAttack: calculateStat(baseFieldAttack, level),
    fieldDefense: calculateStat(baseFieldDefense, level),
    speed: calculateStat(baseSpeed, level),
    
    // Base Stats
    baseHp,
    baseAttack,
    baseDefense,
    baseFieldAttack,
    baseFieldDefense,
    baseSpeed,
    
    // Battle
    moves,
    nature: stats.nature,
    specialAbility: stats.specialAbility,
    specialAbilityUnlockLevel: abilityUnlockLevel,
    
    // Roster
    isInRoster: isFirstPiclet,
    rosterPosition: isFirstPiclet ? 0 : undefined,
    
    // Metadata
    caught: isFirstPiclet, // First piclet is automatically caught
    caughtAt: isFirstPiclet ? new Date() : undefined,
    bst,
    tier: stats.tier, // Use tier from stats
    role: 'balanced', // Could be enhanced based on stat distribution
    variance: 0,
    
    // Original generation data
    imageUrl: data.imageUrl,
    imageData: data.imageData,
    imageCaption: data.imageCaption,
    concept: data.concept,
    description: stats.description,
    imagePrompt: data.imagePrompt
  };
}


// Save a new PicletInstance
export async function savePicletInstance(piclet: Omit<PicletInstance, 'id'>): Promise<number> {
  return await db.picletInstances.add(piclet);
}

// Mark a Piclet as caught
export async function catchPiclet(picletId: number): Promise<void> {
  await db.picletInstances.update(picletId, {
    caught: true,
    caughtAt: new Date()
  });
}

// Get only caught Piclets (for Pictuary and battle roster)
export async function getCaughtPiclets(): Promise<PicletInstance[]> {
  const allPiclets = await db.picletInstances.toArray();
  return allPiclets.filter(p => p.caught === true);
}

// Get uncaught Piclets (for encounters)
export async function getUncaughtPiclets(): Promise<PicletInstance[]> {
  const allPiclets = await db.picletInstances.toArray();
  return allPiclets.filter(p => p.caught === false);
}

// Get all PicletInstances
export async function getAllPicletInstances(): Promise<PicletInstance[]> {
  return await db.picletInstances.toArray();
}

// Get roster PicletInstances
export async function getRosterPiclets(): Promise<PicletInstance[]> {
  const allPiclets = await db.picletInstances.toArray();
  return allPiclets
    .filter(p => 
      p.caught === true && // Only caught Piclets can be in roster
      p.rosterPosition !== undefined && 
      p.rosterPosition !== null && 
      p.rosterPosition >= 0 && 
      p.rosterPosition <= 5
    )
    .sort((a, b) => (a.rosterPosition ?? 0) - (b.rosterPosition ?? 0));
}

// Update roster position
export async function updateRosterPosition(id: number, position: number | undefined): Promise<void> {
  await db.picletInstances.update(id, {
    isInRoster: position !== undefined,
    rosterPosition: position
  });
}

// Move piclet to roster
export async function moveToRoster(id: number, position: number): Promise<void> {
  // Check if position is already occupied
  const existingPiclet = await db.picletInstances
    .where('rosterPosition')
    .equals(position)
    .and(item => item.isInRoster)
    .first();
    
  if (existingPiclet) {
    // Move existing piclet to storage
    await db.picletInstances.update(existingPiclet.id!, {
      isInRoster: false,
      rosterPosition: undefined
    });
  }
  
  // Move new piclet to roster
  await db.picletInstances.update(id, {
    isInRoster: true,
    rosterPosition: position
  });
}

// Swap roster positions
export async function swapRosterPositions(id1: number, position1: number, id2: number, position2: number): Promise<void> {
  await db.transaction('rw', db.picletInstances, async () => {
    await db.picletInstances.update(id1, { rosterPosition: position2 });
    await db.picletInstances.update(id2, { rosterPosition: position1 });
  });
}

// Move piclet to storage
export async function moveToStorage(id: number): Promise<void> {
  await db.picletInstances.update(id, {
    isInRoster: false,
    rosterPosition: undefined
  });
}

// Get storage piclets
export async function getStoragePiclets(): Promise<PicletInstance[]> {
  const allPiclets = await db.picletInstances.toArray();
  return allPiclets.filter(p => 
    p.caught === true && // Only caught Piclets can be in storage
    (p.rosterPosition === undefined || 
     p.rosterPosition === null ||
     p.rosterPosition < 0 ||
     p.rosterPosition > 5)
  );
}

// Delete a PicletInstance
export async function deletePicletInstance(id: number): Promise<void> {
  await db.picletInstances.delete(id);
}