import { describe, it, expect, beforeEach } from 'vitest';
import { BattleEngine } from './BattleEngine';
import type { PicletDefinition, Move, SpecialAbility } from './types';
import { PicletType, AttackType } from './types';

describe('Missing Battle System Features', () => {
  describe('manipulatePP Effects', () => {
    it('should drain opponent PP', () => {
      const ppDrainer: PicletDefinition = {
        name: "PP Drainer",
        description: "Drains opponent's PP",
        tier: 'medium',
        primaryType: PicletType.CULTURE,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Calm",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Mind Drain",
            type: AttackType.CULTURE,
            power: 0,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: [],
            effects: [
              {
                type: 'manipulatePP',
                target: 'opponent',
                action: 'drain',
                amount: 'medium'
              }
            ]
          }
        ]
      };

      const opponent: PicletDefinition = {
        name: "Opponent",
        description: "Standard opponent",
        tier: 'medium',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Hardy",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Tackle",
            type: AttackType.NORMAL,
            power: 40,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: ['contact'],
            effects: [{ type: 'damage', target: 'opponent', amount: 'normal' }]
          }
        ]
      };

      const engine = new BattleEngine(ppDrainer, opponent);
      const initialPP = engine.getState().opponentPiclet.moves[0].currentPP;

      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      const finalPP = engine.getState().opponentPiclet.moves[0].currentPP;
      expect(finalPP).toBeLessThan(initialPP);
      expect(engine.getLog().some(msg => msg.includes('PP was drained'))).toBe(true);
    });

    it('should restore own PP', () => {
      const ppRestorer: PicletDefinition = {
        name: "PP Restorer",  
        description: "Restores own PP",
        tier: 'medium',
        primaryType: PicletType.FLORA,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Calm",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "PP Restore",
            type: AttackType.FLORA,
            power: 0,
            accuracy: 100,
            pp: 5,
            priority: 0,
            flags: [],
            effects: [
              {
                type: 'manipulatePP',
                target: 'self',
                action: 'restore',
                amount: 'large'
              }
            ]
          }
        ]
      };

      const opponent: PicletDefinition = {
        name: "Opponent",
        description: "Standard opponent",
        tier: 'medium',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Hardy",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Tackle",
            type: AttackType.NORMAL,
            power: 40,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: ['contact'],
            effects: [{ type: 'damage', target: 'opponent', amount: 'normal' }]
          }
        ]
      };

      const engine = new BattleEngine(ppRestorer, opponent);
      
      // Use the PP restore move multiple times to drain it
      engine['state'].playerPiclet.moves[0].currentPP = 1;
      const initialPP = engine['state'].playerPiclet.moves[0].currentPP;

      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      const finalPP = engine.getState().playerPiclet.moves[0].currentPP;
      expect(finalPP).toBeGreaterThan(initialPP);
      expect(engine.getLog().some(msg => msg.includes('PP was restored'))).toBe(true);
    });
  });

  describe('fieldEffect System', () => {
    it('should apply field effects that persist across turns', () => {
      const fieldEffectUser: PicletDefinition = {
        name: "Field Controller",
        description: "Controls battlefield effects",
        tier: 'medium',
        primaryType: PicletType.SPACE,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Calm",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Reflect",
            type: AttackType.SPACE,
            power: 0,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: [],
            effects: [
              {
                type: 'fieldEffect',
                effect: 'reflect',
                target: 'playerSide',
                stackable: false
              }
            ]
          }
        ]
      };

      const opponent: PicletDefinition = {
        name: "Opponent",
        description: "Standard opponent",
        tier: 'medium',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Hardy",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Physical Attack",
            type: AttackType.BEAST,
            power: 60,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: ['contact'],
            effects: [{ type: 'damage', target: 'opponent', amount: 'normal' }]
          }
        ]
      };

      const engine = new BattleEngine(fieldEffectUser, opponent);
      
      // Apply reflect
      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      expect(engine.getLog().some(msg => msg.includes('Reflect') && msg.includes('applied'))).toBe(true);
      
      // Check if reflect reduces physical damage in subsequent turns
      const initialHp = engine.getState().playerPiclet.currentHp;
      
      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      const finalHp = engine.getState().playerPiclet.currentHp;
      const damage = initialHp - finalHp;
      
      // Reflect should reduce physical damage
      expect(damage).toBeLessThan(30); // Should be reduced from normal ~40-50 damage
    });

    it('should handle spikes field effect', () => {
      const spikesUser: PicletDefinition = {
        name: "Spikes User",
        description: "Sets entry hazards",
        tier: 'medium',
        primaryType: PicletType.MINERAL,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Impish",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Spikes",
            type: AttackType.MINERAL,
            power: 0,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: [],
            effects: [
              {
                type: 'fieldEffect',
                effect: 'spikes', 
                target: 'opponentSide',
                stackable: true
              }
            ]
          }
        ]
      };

      const opponent: PicletDefinition = {
        name: "Opponent",
        description: "Standard opponent",
        tier: 'medium',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 70 },
        nature: "Hardy",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Tackle",
            type: AttackType.NORMAL,
            power: 40,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: ['contact'],
            effects: [{ type: 'damage', target: 'opponent', amount: 'normal' }]
          }
        ]
      };

      const engine = new BattleEngine(spikesUser, opponent);
      
      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      expect(engine.getLog().some(msg => msg.includes('Spikes') && msg.includes('set'))).toBe(true);
      
      // TODO: Test spikes damage when switching (requires switching mechanics)
    });
  });

  describe('counter Effects', () => {
    it('should counter physical attacks', () => {
      const counterUser: PicletDefinition = {
        name: "Counter Fighter",
        description: "Counters physical attacks",
        tier: 'medium', 
        primaryType: PicletType.BEAST,
        baseStats: { hp: 100, attack: 60, defense: 80, speed: 50 },
        nature: "Brave",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Counter",
            type: AttackType.BEAST,
            power: 0,
            accuracy: 100,
            pp: 10,
            priority: 1, // High priority to set up counter before opponent attacks
            flags: ['lowPriority'],
            effects: [
              {
                type: 'counter',
                strength: 'strong'
              }
            ]
          }
        ]
      };

      const opponent: PicletDefinition = {
        name: "Physical Attacker",
        description: "Uses physical moves",
        tier: 'medium',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 80, attack: 80, defense: 60, speed: 70 },
        nature: "Adamant",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Physical Strike",
            type: AttackType.BEAST,
            power: 80,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: ['contact'],
            effects: [{ type: 'damage', target: 'opponent', amount: 'normal' }]
          }
        ]
      };

      const engine = new BattleEngine(counterUser, opponent);
      const initialOpponentHp = engine.getState().opponentPiclet.currentHp;
      
      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      const finalOpponentHp = engine.getState().opponentPiclet.currentHp;
      expect(finalOpponentHp).toBeLessThan(initialOpponentHp);
      expect(engine.getLog().some(msg => msg.includes('countered') || msg.includes('Counter'))).toBe(true);
    });
  });

  describe('priority Effects', () => {
    it('should modify move priority conditionally', () => {
      const priorityUser: PicletDefinition = {
        name: "Priority User",
        description: "Uses priority moves based on conditions",
        tier: 'medium',
        primaryType: PicletType.SPACE,
        baseStats: { hp: 60, attack: 70, defense: 50, speed: 40 },
        nature: "Quiet",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Desperation Strike",
            type: AttackType.SPACE,
            power: 60,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: [],
            effects: [
              {
                type: 'damage',
                target: 'opponent',
                amount: 'normal'
              },
              {
                type: 'priority',
                target: 'self',
                value: 1,
                condition: 'ifLowHp'
              }
            ]
          }
        ]
      };

      const fastOpponent: PicletDefinition = {
        name: "Fast Opponent",
        description: "Very fast opponent",
        tier: 'medium',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 80, attack: 60, defense: 60, speed: 100 },
        nature: "Timid",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Quick Attack",
            type: AttackType.NORMAL,
            power: 40,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: [],
            effects: [{ type: 'damage', target: 'opponent', amount: 'normal' }]
          }
        ]
      };

      const engine = new BattleEngine(priorityUser, fastOpponent);
      
      // Damage the priority user to trigger low HP condition
      engine['state'].playerPiclet.currentHp = Math.floor(engine['state'].playerPiclet.maxHp * 0.2);
      
      engine.executeActions(
        { type: 'move', piclet: 'player', moveIndex: 0 },
        { type: 'move', piclet: 'opponent', moveIndex: 0 }
      );

      const log = engine.getLog();
      const playerMoveIndex = log.findIndex(msg => msg.includes('Priority User used Desperation Strike'));
      const opponentMoveIndex = log.findIndex(msg => msg.includes('Fast Opponent used Quick Attack'));
      
      // When at low HP, priority user should go first despite lower speed
      expect(playerMoveIndex).toBeLessThan(opponentMoveIndex);
    });
  });

  describe('removeStatus Effects', () => {
    it('should remove status effects from target', () => {
      // Simple test: create a move that only removes poison status
      const cleanser: PicletDefinition = {
        name: "Cleanser",
        description: "Can remove poison",
        tier: 'medium',
        primaryType: PicletType.FLORA,
        baseStats: { hp: 100, attack: 50, defense: 50, speed: 50 },
        nature: "Calm",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Cleanse",
            type: AttackType.FLORA,
            power: 0,
            accuracy: 100,
            pp: 10,
            priority: 0,
            flags: [],
            effects: [
              {
                type: 'removeStatus',
                target: 'self',
                status: 'poison'
              }
            ]
          }
        ]
      };

      const dummy: PicletDefinition = {
        name: "Dummy",
        description: "Does nothing",
        tier: 'low',
        primaryType: PicletType.BEAST,
        baseStats: { hp: 50, attack: 30, defense: 30, speed: 30 },
        nature: "Docile",
        specialAbility: { name: "No Ability", description: "" },
        movepool: [
          {
            name: "Do Nothing",
            type: AttackType.NORMAL,
            power: 0,
            accuracy: 100,
            pp: 20,
            priority: 0,
            flags: [],
            effects: []
          }
        ]
      };

      const engine = new BattleEngine(cleanser, dummy);
      const playerPiclet = engine.getState().playerPiclet;

      // Test the removeStatus effect by directly calling it
      // This bypasses any turn/timing issues
      const mockEffect = { status: 'poison' };
      
      // First add poison manually
      playerPiclet.statusEffects.push('poison');
      expect(playerPiclet.statusEffects.includes('poison')).toBe(true);
      
      // Call the removeStatus effect processor directly
      engine['processRemoveStatusEffect'](mockEffect, playerPiclet);
      
      // Check if poison was removed
      expect(playerPiclet.statusEffects.includes('poison')).toBe(false);
    });
  });
});