/**
 * Adaptive Tactics - Combat Tests
 * Tests for combat execution, healing, death handling
 */

import { Unit, Weapon, MapData } from '../js/models.js';
import { executeCombat, executeHeal, CombatResult, generateCombatLog } from '../js/combat.js';

// Test utilities
function assert(condition, message) {
    if (!condition) {
        throw new Error(`FAILED: ${message}`);
    }
    console.log(`PASSED: ${message}`);
}

function createTestWeapon(overrides = {}) {
    return new Weapon({
        id: 'test_sword',
        name: 'Test Sword',
        kind: 'physical',
        might: 5,
        hit: 100, // 100% hit for deterministic tests
        minRange: 1,
        maxRange: 1,
        heal: 0,
        ...overrides
    });
}

function createTestUnit(id, faction, weaponOverrides = {}) {
    const weapon = createTestWeapon(weaponOverrides);
    return new Unit({
        id: id,
        name: `Test ${id}`,
        sprite: 'test.png',
        faction: faction,
        stats: {
            hp: 30,
            maxHp: 30,
            power: 10,
            skill: 15,
            speed: 10,
            def: 5,
            res: 5,
            mov: 5
        },
        weapons: [weapon.id],
        equippedWeapon: weapon.id
    }, { [weapon.id]: weapon });
}

function createTestMap() {
    const mapData = new MapData({
        id: 'test_map',
        name: 'Test Map',
        rows: 5,
        cols: 5,
        tiles: {
            blocked: [],
            bush: [],
            throne: []
        },
        player_spawn: {},
        enemy_layout: {},
        flex_nodes: {},
        reinforcement_entries: {}
    });
    mapData.initTiles();
    return mapData;
}

const testGameRules = {
    double_speed_gap: 4
};

// Test: Basic Combat Exchange
function testBasicCombat() {
    const map = createTestMap();
    const attacker = createTestUnit('attacker', 'player', { hit: 100 });
    const defender = createTestUnit('defender', 'enemy', { hit: 100 });

    attacker.power = 12;
    attacker.setPosition(2, 2);
    defender.def = 5;
    defender.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(attacker);
    map.getTile(2, 3).placeUnit(defender);

    const result = executeCombat(attacker, defender, map, testGameRules);

    // Damage: 12 + 5 - 5 = 12
    assert(result.attacks.length >= 1, 'Should have at least 1 attack');
    assert(result.attacks[0].damage === 12, `First attack should deal 12 damage, got ${result.attacks[0].damage}`);
    assert(defender.hp === 18, `Defender should have 18 HP remaining, got ${defender.hp}`);
}

// Test: Counter Attack
function testCounterAttack() {
    const map = createTestMap();
    const attacker = createTestUnit('attacker', 'player', { hit: 100 });
    const defender = createTestUnit('defender', 'enemy', { hit: 100 });

    attacker.power = 10;
    defender.power = 8;
    attacker.setPosition(2, 2);
    defender.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(attacker);
    map.getTile(2, 3).placeUnit(defender);

    const result = executeCombat(attacker, defender, map, testGameRules);

    // Both should have acted
    const attackerAttacks = result.attacks.filter(a => a.attackerId === 'attacker');
    const defenderCounters = result.attacks.filter(a => a.attackerId === 'defender' && a.isCounter);

    assert(attackerAttacks.length >= 1, 'Attacker should have attacked');
    assert(defenderCounters.length >= 1, 'Defender should have countered');
}

// Test: No Counter at Range 2 with Sword
function testNoCounterAtRange2() {
    const map = createTestMap();
    const attacker = createTestUnit('attacker', 'player', {
        id: 'spear',
        minRange: 1,
        maxRange: 2,
        hit: 100
    });
    const defender = createTestUnit('defender', 'enemy', {
        id: 'sword',
        minRange: 1,
        maxRange: 1,
        hit: 100
    });

    attacker.setPosition(2, 2);
    defender.setPosition(2, 4); // 2 tiles away

    map.getTile(2, 2).placeUnit(attacker);
    map.getTile(2, 4).placeUnit(defender);

    const result = executeCombat(attacker, defender, map, testGameRules);

    const defenderCounters = result.attacks.filter(a => a.attackerId === 'defender');
    assert(defenderCounters.length === 0, 'Sword defender should not counter at range 2');
}

// Test: Doubling
function testDoubling() {
    const map = createTestMap();
    const attacker = createTestUnit('attacker', 'player', { hit: 100 });
    const defender = createTestUnit('defender', 'enemy', { hit: 100 });

    attacker.speed = 15;
    defender.speed = 10; // 5 speed difference, should double

    attacker.setPosition(2, 2);
    defender.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(attacker);
    map.getTile(2, 3).placeUnit(defender);

    const result = executeCombat(attacker, defender, map, testGameRules);

    const attackerAttacks = result.attacks.filter(a => a.attackerId === 'attacker');
    assert(attackerAttacks.length === 2, `Attacker should attack twice (double), got ${attackerAttacks.length}`);
}

// Test: Death During Combat
function testDeathDuringCombat() {
    const map = createTestMap();
    const attacker = createTestUnit('attacker', 'player', { hit: 100, might: 30 });
    const defender = createTestUnit('defender', 'enemy', { hit: 100 });

    attacker.power = 30; // Will one-shot
    defender.hp = 20;
    defender.maxHp = 20;

    attacker.setPosition(2, 2);
    defender.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(attacker);
    map.getTile(2, 3).placeUnit(defender);

    const result = executeCombat(attacker, defender, map, testGameRules);

    assert(result.defenderDied === true, 'Defender should be marked as died');
    assert(defender.alive === false, 'Defender should be dead');
    assert(defender.hp === 0, 'Defender HP should be 0');
}

// Test: Defender Dies Before Counter
function testDefenderDiesBeforeCounter() {
    const map = createTestMap();
    const attacker = createTestUnit('attacker', 'player', { hit: 100 });
    const defender = createTestUnit('defender', 'enemy', { hit: 100 });

    attacker.power = 30;
    defender.hp = 10;
    defender.maxHp = 10;
    defender.power = 20; // Would deal big damage if alive

    attacker.setPosition(2, 2);
    defender.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(attacker);
    map.getTile(2, 3).placeUnit(defender);

    const result = executeCombat(attacker, defender, map, testGameRules);

    const defenderCounters = result.attacks.filter(a => a.attackerId === 'defender');
    assert(defenderCounters.length === 0, 'Dead defender should not counter');
    assert(attacker.hp === 30, 'Attacker should be at full HP');
}

// Test: Healing
function testHealing() {
    const map = createTestMap();
    const healWeapon = new Weapon({
        id: 'staff',
        name: 'Heal Staff',
        kind: 'heal',
        might: 0,
        hit: 100,
        minRange: 1,
        maxRange: 1,
        heal: 6
    });

    const healer = new Unit({
        id: 'healer',
        name: 'Healer',
        sprite: 'test.png',
        faction: 'player',
        stats: { hp: 20, maxHp: 20, power: 5, skill: 10, speed: 8, def: 3, res: 10, mov: 4 },
        weapons: ['staff'],
        equippedWeapon: 'staff'
    }, { staff: healWeapon });

    const target = createTestUnit('target', 'player');
    target.hp = 15;
    target.maxHp = 30;

    healer.setPosition(2, 2);
    target.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(healer);
    map.getTile(2, 3).placeUnit(target);

    const result = executeHeal(healer, target, map);

    assert(result.success === true, 'Heal should succeed');
    assert(result.amount === 6, `Should heal for 6, got ${result.amount}`);
    assert(target.hp === 21, `Target should have 21 HP, got ${target.hp}`);
}

// Test: Overheal Capped at MaxHP
function testOverhealCapped() {
    const map = createTestMap();
    const healWeapon = new Weapon({
        id: 'staff',
        name: 'Heal Staff',
        kind: 'heal',
        might: 0,
        hit: 100,
        minRange: 1,
        maxRange: 1,
        heal: 10
    });

    const healer = new Unit({
        id: 'healer',
        name: 'Healer',
        sprite: 'test.png',
        faction: 'player',
        stats: { hp: 20, maxHp: 20, power: 5, skill: 10, speed: 8, def: 3, res: 10, mov: 4 },
        weapons: ['staff'],
        equippedWeapon: 'staff'
    }, { staff: healWeapon });

    const target = createTestUnit('target', 'player');
    target.hp = 28;
    target.maxHp = 30;

    healer.setPosition(2, 2);
    target.setPosition(2, 3);

    map.getTile(2, 2).placeUnit(healer);
    map.getTile(2, 3).placeUnit(target);

    const result = executeHeal(healer, target, map);

    assert(result.success === true, 'Heal should succeed');
    assert(result.amount === 2, `Should only heal 2 (to cap), got ${result.amount}`);
    assert(target.hp === 30, `Target should be at max HP 30, got ${target.hp}`);
}

// Test: Combat Log Generation
function testCombatLogGeneration() {
    const result = new CombatResult();
    result.addAttack(
        { id: 'a', name: 'Attacker' },
        { id: 'd', name: 'Defender' },
        true,
        12,
        false
    );
    result.addAttack(
        { id: 'd', name: 'Defender' },
        { id: 'a', name: 'Attacker' },
        false,
        0,
        true
    );

    const logs = generateCombatLog(result);

    assert(logs.length === 2, `Should have 2 log entries, got ${logs.length}`);
    assert(logs[0].text.includes('hit') && logs[0].text.includes('12'), 'First log should mention hit and damage');
    assert(logs[1].text.includes('missed'), 'Second log should mention miss');
}

// Run all tests
function runAllTests() {
    console.log('=== Running Combat Tests ===\n');

    try {
        testBasicCombat();
        testCounterAttack();
        testNoCounterAtRange2();
        testDoubling();
        testDeathDuringCombat();
        testDefenderDiesBeforeCounter();
        testHealing();
        testOverhealCapped();
        testCombatLogGeneration();

        console.log('\n=== All Combat Tests Passed ===');
    } catch (e) {
        console.error('\n=== Test Failed ===');
        console.error(e.message);
        throw e;
    }
}

// Export for use in browser or Node
if (typeof window !== 'undefined') {
    window.runCombatTests = runAllTests;
}

export { runAllTests };