import { LitElement, html, css } from 'lit';

// Import Tier 1 Class Definitions
import vanguardDef from '../assets/data/classes/vanguard.json' with { type: 'json' };
import weaverDef from '../assets/data/classes/aether_weaver.json' with { type: 'json' };
import scavengerDef from '../assets/data/classes/scavenger.json' with { type: 'json' };
import tinkerDef from '../assets/data/classes/tinker.json' with { type: 'json' };
import custodianDef from '../assets/data/classes/custodian.json' with { type: 'json' };

// UI Metadata Mapping
const CLASS_METADATA = {
  'CLASS_VANGUARD': { 
    icon: '🛡️', 
    image: 'assets/images/portraits/vanguard.png',
    role: 'Tank', 
    description: 'A heavy frontline tank specialized in absorbing damage.' 
  },
  'CLASS_WEAVER': { 
    icon: '✨', 
    image: 'assets/images/portraits/weaver.png',
    role: 'Magic DPS', 
    description: 'A master of elemental magic capable of creating synergy chains.' 
  },
  'CLASS_SCAVENGER': { 
    icon: '🎒', 
    image: 'assets/images/portraits/scavenger.png',
    role: 'Utility', 
    description: 'Highly mobile utility expert who excels at finding loot.' 
  },
  'CLASS_TINKER': { 
    icon: '🔧', 
    image: 'assets/images/portraits/tinker.png',
    role: 'Tech', 
    description: 'Uses ancient technology to deploy turrets.' 
  },
  'CLASS_CUSTODIAN': { 
    icon: '🌿', 
    image: 'assets/images/portraits/custodian.png',
    role: 'Healer', 
    description: 'A spiritual healer focused on removing corruption.' 
  }
};

const RAW_TIER_1_CLASSES = [vanguardDef, weaverDef, scavengerDef, tinkerDef, custodianDef];

export class TeamBuilder extends LitElement {
  static get styles() {
    return css`
      :host {
        display: block;
        position: absolute;
        top: 0; left: 0; width: 100%; height: 100%;
        font-family: 'Courier New', monospace;
        color: white;
        pointer-events: none;
        z-index: 10;
        box-sizing: border-box;
      }

      .container {
        display: grid;
        grid-template-columns: 280px 1fr 300px;
        grid-template-rows: 1fr 100px;
        grid-template-areas: "roster squad details" "footer footer footer";
        height: 100%; width: 100%;
        pointer-events: auto;
        background: rgba(0, 0, 0, 0.85);
        backdrop-filter: blur(4px);
      }

      @media (max-width: 1024px) {
        .container {
          grid-template-columns: 1fr;
          grid-template-rows: 200px 1fr 200px 80px;
          grid-template-areas: "roster" "squad" "details" "footer";
        }
      }

      /* --- LEFT PANEL: ROSTER --- */
      .roster-panel {
        grid-area: roster;
        background: rgba(20, 20, 30, 0.9);
        border-right: 2px solid #555;
        padding: 1rem;
        overflow-y: auto;
        display: flex;
        flex-direction: column;
        gap: 10px;
      }

      h3 { margin-top: 0; color: #00ffff; border-bottom: 1px solid #555; padding-bottom: 10px; }

      .card {
        background: #333;
        border: 2px solid #555;
        padding: 15px;
        cursor: pointer;
        transition: all 0.2s;
        display: flex;
        align-items: center;
        gap: 15px;
        width: 100%;
        text-align: left;
        font-family: inherit;
        color: inherit;
        appearance: none;
      }

      .card:hover:not(:disabled) {
        border-color: #00ffff;
        background: #444;
        transform: translateX(5px);
      }

      .card.selected {
        border-color: #00ff00;
        background: #224422;
      }

      .card:disabled {
        opacity: 0.5;
        cursor: not-allowed;
        filter: grayscale(1);
      }

      /* --- CENTER PANEL: SQUAD SLOTS --- */
      .squad-panel {
        grid-area: squad;
        display: flex;
        justify-content: center;
        align-items: center;
        padding: 2rem;
        gap: 30px;
        flex-wrap: wrap;
      }

      .slot-wrapper {
        position: relative;
        width: 180px; /* Wider for portraits */
        height: 240px; /* Taller for portraits */
        transition: transform 0.2s;
      }
      .slot-wrapper:hover { transform: scale(1.05); }

      .squad-slot {
        width: 100%; height: 100%;
        background: rgba(10, 10, 10, 0.8);
        border: 3px dashed #666;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        font-family: inherit; color: inherit; padding: 0; appearance: none;
        overflow: hidden;
      }
      
      /* Image placeholder style */
      .unit-image {
        width: 100%;
        height: 75%;
        object-fit: cover;
        background-color: #222; 
        border-bottom: 2px solid #555;
      }
      
      .unit-info {
        height: 25%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 100%;
        background: rgba(30,30,40,0.95);
        padding: 5px;
        box-sizing: border-box;
      }

      .squad-slot.filled {
        border: 3px solid #00ff00;
        background: rgba(0, 20, 0, 0.8);
      }
      
      .squad-slot.selected {
        border-color: #00ffff;
        box-shadow: 0 0 15px rgba(0,255,255,0.3);
      }

      .remove-btn {
        position: absolute; top: -12px; right: -12px;
        background: #cc0000; color: white;
        width: 28px; height: 28px;
        border: 2px solid white; border-radius: 50%;
        cursor: pointer; font-weight: bold; z-index: 2;
      }
      
      .placeholder-img {
        display: flex; 
        align-items: center; 
        justify-content: center; 
        background: transparent; 
        color: #555; 
        font-size: 3rem;
        height: 100%;
      }

      /* --- RIGHT PANEL: DETAILS --- */
      .details-panel {
        grid-area: details;
        background: rgba(20, 20, 30, 0.9);
        border-left: 2px solid #555;
        padding: 1.5rem;
        overflow-y: auto;
      }

      .footer {
        grid-area: footer;
        display: flex;
        justify-content: center;
        align-items: center;
        background: rgba(10, 10, 20, 0.95);
        border-top: 2px solid #555;
      }

      .embark-btn {
        padding: 15px 60px;
        font-size: 1.8rem;
        background: #008800;
        color: white;
        border: 3px solid #00ff00;
        cursor: pointer;
        text-transform: uppercase;
        font-weight: bold;
        font-family: inherit;
        letter-spacing: 2px;
      }
      .embark-btn:disabled {
        background: #333; border-color: #555; color: #777; cursor: not-allowed;
      }
    `;
  }

  static get properties() {
    return {
      mode: { type: String }, // 'DRAFT' (Classes) or 'ROSTER' (Existing Units)
      availablePool: { type: Array }, // List of Classes OR Units
      squad: { type: Array }, // The 4 slots
      selectedSlotIndex: { type: Number },
      hoveredItem: { type: Object }
    };
  }

  constructor() {
    super();
    this.squad = [null, null, null, null];
    this.selectedSlotIndex = 0;
    this.hoveredItem = null;
    this.mode = 'DRAFT'; // Default
    this.availablePool = [];
  }

  connectedCallback() {
    super.connectedCallback();
    this._initializeData();
  }

  /**
   * Configures the component based on provided data.
   */
  _initializeData() {
    // 1. If we were passed an existing roster (e.g. from RosterManager), use it.
    if (this.availablePool && this.availablePool.length > 0) {
        this.mode = 'ROSTER';
        console.log("TeamBuilder: Using Provided Roster", this.availablePool);
        return;
    }

    // 2. Default: Draft Mode (New Game)
    // Populate with Tier 1 classes
    this.mode = 'DRAFT';
    this.availablePool = RAW_TIER_1_CLASSES.map(cls => {
      const meta = CLASS_METADATA[cls.id] || {};
      return { ...cls, ...meta, unlocked: true };
    });
    console.log("TeamBuilder: Initializing Draft Mode");
  }

  render() {
    const isSquadValid = this.squad.some(u => u !== null);

    return html`
      <div class="container">
        <!-- ROSTER PANEL -->
        <div class="roster-panel">
          <h3>${this.mode === 'DRAFT' ? 'Recruit Explorers' : 'Barracks Roster'}</h3>
          
          ${this.availablePool.map(item => {
             const isSelected = this.squad.some(s => s && (this.mode === 'ROSTER' ? s.id === item.id : false));
             
             return html`
              <button 
                type="button"
                class="card ${isSelected ? 'selected' : ''}"
                ?disabled="${this.mode === 'DRAFT' && !item.unlocked || isSelected}"
                @click="${() => this._assignItem(item)}"
                @mouseenter="${() => this.hoveredItem = item}"
                @mouseleave="${() => this.hoveredItem = null}"
              >
                <div class="icon" style="font-size: 1.5rem;">
                    ${item.icon || CLASS_METADATA[item.classId]?.icon || '⚔️'}
                </div>
                <div>
                  <strong>${item.name}</strong><br>
                  <small>${this.mode === 'ROSTER' ? `Lvl ${item.level || 1} ${item.classId.replace('CLASS_', '')}` : item.role}</small>
                </div>
              </button>
            `;
          })}
        </div>

        <!-- SQUAD SLOTS -->
        <div class="squad-panel">
          ${this.squad.map((unit, index) => html`
            <div class="slot-wrapper">
              <button 
                type="button"
                class="squad-slot ${unit ? 'filled' : ''} ${this.selectedSlotIndex === index ? 'selected' : ''}"
                @click="${() => this._selectSlot(index)}"
              >
                ${unit 
                  ? html`
                      <!-- Use image property if available, otherwise show large icon placeholder -->
                      ${unit.image 
                        ? html`<img src="${unit.image}" alt="${unit.name}" class="unit-image" onerror="this.style.display='none'; this.nextElementSibling.style.display='flex'">` 
                        : ''
                      }
                      <div class="placeholder-img" style="${unit.image ? 'display:none;' : ''} font-size: 3rem;">
                         ${unit.icon || '🛡️'}
                      </div>
                      
                      <div class="unit-info">
                        <strong>${unit.name}</strong>
                        <small style="font-size: 0.7rem; color: #aaa;">${this.mode === 'DRAFT' ? unit.role : unit.classId.replace('CLASS_', '')}</small>
                      </div>
                    ` 
                  : html`
                      <div class="placeholder-img">+</div>
                      <div class="unit-info" style="background:transparent;">
                        <span>Slot ${index + 1}</span>
                        <small>Select ${this.mode === 'DRAFT' ? 'Class' : 'Unit'}</small>
                      </div>
                    `
                }
              </button>
              ${unit ? html`<button type="button" class="remove-btn" @click="${() => this._removeUnit(index)}">X</button>` : ''}
            </div>
          `)}
        </div>

        <!-- DETAILS PANEL -->
        <div class="details-panel">
          ${this._renderDetails()}
        </div>

        <!-- FOOTER -->
        <div class="footer">
          <button type="button" class="embark-btn" ?disabled="${!isSquadValid}" @click="${this._handleEmbark}">
            ${this.mode === 'DRAFT' ? 'INITIALIZE SQUAD' : 'EMBARK'}
          </button>
        </div>
      </div>
    `;
  }

  _renderDetails() {
      if (!this.hoveredItem) return html`<p>Hover over a unit to see details.</p>`;
      
      // Handle data structure diffs between ClassDef and UnitInstance
      const name = this.hoveredItem.name;
      const role = this.hoveredItem.role || this.hoveredItem.classId;
      const stats = this.hoveredItem.base_stats || this.hoveredItem.stats || {}; 
      
      return html`
        <h2>${name}</h2>
        <p><em>${role}</em></p>
        <hr>
        <p>${this.hoveredItem.description || 'Ready for deployment.'}</p>
        <h4>Stats</h4>
        <ul>
            <li>HP: ${stats.health}</li>
            <li>Atk: ${stats.attack || 0}</li>
            <li>Spd: ${stats.speed}</li>
        </ul>
      `;
  }

  _selectSlot(index) {
    this.selectedSlotIndex = index;
  }

  _assignItem(item) {
    if (this.mode === 'DRAFT' && !item.unlocked) return;

    let unitManifest;

    if (this.mode === 'DRAFT') {
        // Create new unit definition
        unitManifest = {
            classId: item.id,
            name: item.name, 
            icon: item.icon,
            image: item.image, // Pass image path
            role: item.role,
            isNew: true // Flag for GameLoop/Manager to generate ID
        };
    } else {
        // Select existing unit
        // Try to recover image from CLASS_METADATA if not stored on unit instance
        const meta = CLASS_METADATA[item.classId] || {};
        
        unitManifest = {
            id: item.id,
            classId: item.classId,
            name: item.name,
            icon: meta.icon,
            image: meta.image,
            role: meta.role,
            ...item
        };
    }

    const newSquad = [...this.squad];
    newSquad[this.selectedSlotIndex] = unitManifest;
    this.squad = newSquad;

    if (this.selectedSlotIndex < 3) this.selectedSlotIndex++;
  }

  _removeUnit(index) {
    const newSquad = [...this.squad];
    newSquad[index] = null;
    this.squad = newSquad;
    this.selectedSlotIndex = index;
  }

  _handleEmbark() {
    const manifest = this.squad.filter(u => u !== null);
    
    this.dispatchEvent(new CustomEvent('embark', {
      detail: { squad: manifest, mode: this.mode },
      bubbles: true,
      composed: true
    }));
  }

  // Helpers to make IDs readable (e.g. "ITEM_RUSTY_BLADE" -> "Rusty Blade")
  _formatItemName(id) {
    return id.replace('ITEM_', '').replace(/_/g, ' ').toLowerCase().replace(/\b\w/g, l => l.toUpperCase());
  }

  _formatSkillName(id) {
    return id.replace('SKILL_', '').replace(/_/g, ' ').toLowerCase().replace(/\b\w/g, l => l.toUpperCase());
  }
}

customElements.define('team-builder', TeamBuilder);