/**
 * User Interface & Interactive Controls Module
 * Binds expanded sliders, preset actions, live HUD badges, population history chart,
 * entity inspector, and the post-extinction analysis modal.
 */

export class UIManager {
  constructor(sim, configManager) {
    this.sim = sim;
    this.configManager = configManager;

    this.cacheDOMElements();
    this.bindEvents();
    this.syncSlidersFromConfig();
  }

  cacheDOMElements() {
    // Primary Controls
    this.btnPlayPause = document.getElementById('btnPlayPause');
    this.btnRestart = document.getElementById('btnRestart');
    this.btnFullscreen = document.getElementById('btnFullscreen');
    this.btnExitFullscreen = document.getElementById('btnExitFullscreen');
    this.btnSetDefaults = document.getElementById('btnSetDefaults');
    this.btnDefaults = document.getElementById('btnDefaults');
    this.btnCopyJson = document.getElementById('btnCopyJson');
    this.btnRain = document.getElementById('btnRain');
    this.toastMsg = document.getElementById('toastMsg');

    // Continuous Screen Saver Mode
    this.checkContinuous = document.getElementById('checkContinuous');

    // Speed buttons
    this.speedBtns = document.querySelectorAll('.speed-btn');

    // Tool buttons
    this.toolBtns = document.querySelectorAll('.tool-btn');

    // Sliders & value displays
    this.sliders = {
      initialSheep: { input: document.getElementById('sliderSheep'), label: document.getElementById('valSheep'), format: (v) => v },
      initialWolves: { input: document.getElementById('sliderWolves'), label: document.getElementById('valWolves'), format: (v) => v },
      initialPlants: { input: document.getElementById('sliderPlants'), label: document.getElementById('valPlants'), format: (v) => v },
      maxPlantCap: { input: document.getElementById('sliderMaxPlantCap'), label: document.getElementById('valMaxPlantCap'), format: (v) => v },

      sheepHungerDepletionRate: { input: document.getElementById('sliderSheepHunger'), label: document.getElementById('valSheepHunger'), format: (v) => `${Number(v).toFixed(1)}/s` },
      sheepGrazingReach: { input: document.getElementById('sliderSheepReach'), label: document.getElementById('valSheepReach'), format: (v) => `${v}px` },
      sheepMatingCooldown: { input: document.getElementById('sliderSheepMating'), label: document.getElementById('valSheepMating'), format: (v) => `${v}s` },

      wolfLungeCost: { input: document.getElementById('sliderWolfLunge'), label: document.getElementById('valWolfLunge'), format: (v) => `${v} HP` },
      wolfHungerDepletionRate: { input: document.getElementById('sliderWolfHunger'), label: document.getElementById('valWolfHunger'), format: (v) => `${Number(v).toFixed(1)}/s` },
      wolfAttackDamage: { input: document.getElementById('sliderWolfDamage'), label: document.getElementById('valWolfDamage'), format: (v) => v },
      wolfMatingCooldown: { input: document.getElementById('sliderWolfMating'), label: document.getElementById('valWolfMating'), format: (v) => `${v}s` },

      plantSeedRate: { input: document.getElementById('sliderSeedRate'), label: document.getElementById('valSeedRate'), format: (v) => `${v}%` },
      plantDryRate: { input: document.getElementById('sliderDryRate'), label: document.getElementById('valDryRate'), format: (v) => `${Number(v).toFixed(1)}/s` },
      rainFrequency: { input: document.getElementById('sliderRain'), label: document.getElementById('valRain'), format: (v) => `${v}%` },
      decaySpeed: { input: document.getElementById('sliderDecay'), label: document.getElementById('valDecay'), format: (v) => `${Number(v).toFixed(1)}x` },

      // Continuous Mode Influx intervals & wave size
      continuousSheepInterval: { input: document.getElementById('sliderContinuousSheep'), label: document.getElementById('valContinuousSheep'), format: (v) => `${v}s` },
      continuousWolfInterval: { input: document.getElementById('sliderContinuousWolf'), label: document.getElementById('valContinuousWolf'), format: (v) => `${v}s` },
      continuousMaxGroupSize: { input: document.getElementById('sliderContinuousGroup'), label: document.getElementById('valContinuousGroup'), format: (v) => `${v}` },
    };

    // Live HUD badges
    this.hudSheep = document.getElementById('hudSheep');
    this.hudWolves = document.getElementById('hudWolves');
    this.hudPlants = document.getElementById('hudPlants');
    this.hudTime = document.getElementById('hudTime');
    this.hudWeather = document.getElementById('hudWeather');

    // Mini chart canvas
    this.miniChartCanvas = document.getElementById('miniChart');
    if (this.miniChartCanvas) {
      this.miniChartCtx = this.miniChartCanvas.getContext('2d');
    }

    // Extinction modal elements
    this.extinctionModal = document.getElementById('extinctionModal');
    this.extinctionChartCanvas = document.getElementById('extinctionChart');
    if (this.extinctionChartCanvas) {
      this.extinctionChartCtx = this.extinctionChartCanvas.getContext('2d');
    }

    this.extTimeSurv = document.getElementById('extTimeSurv');
    this.extPeakSheep = document.getElementById('extPeakSheep');
    this.extPeakWolves = document.getElementById('extPeakWolves');
    this.extPeakPlants = document.getElementById('extPeakPlants');
    this.extTotalBorn = document.getElementById('extTotalBorn');
    this.extWolfKills = document.getElementById('extWolfKills');
    this.extDecayBlooms = document.getElementById('extDecayBlooms');
    this.extSeeds = document.getElementById('extSeeds');

    this.btnModalRestart = document.getElementById('btnModalRestart');
    this.btnModalReview = document.getElementById('btnModalReview');

    // Entity Inspector
    this.inspectorPanel = document.getElementById('inspectorPanel');
    this.inspectorDetails = document.getElementById('inspectorDetails');
    this.btnCloseInspector = document.getElementById('btnCloseInspector');
  }

  showToast(text) {
    if (!this.toastMsg) return;
    this.toastMsg.textContent = text;
    this.toastMsg.classList.remove('hidden');
    clearTimeout(this._toastTimeout);
    this._toastTimeout = setTimeout(() => {
      this.toastMsg.classList.add('hidden');
    }, 2400);
  }

  syncSlidersFromConfig() {
    const cfg = this.configManager.current;

    if (this.checkContinuous && cfg.continuousMode !== undefined) {
      this.checkContinuous.checked = !!cfg.continuousMode;
    }

    for (const [key, item] of Object.entries(this.sliders)) {
      if (item.input && cfg[key] !== undefined) {
        item.input.value = cfg[key];
        if (item.label) {
          item.label.textContent = item.format(cfg[key]);
        }
      }
    }
  }

  readSliders() {
    const config = {};
    if (this.checkContinuous) {
      config.continuousMode = this.checkContinuous.checked;
    }
    for (const [key, item] of Object.entries(this.sliders)) {
      if (item.input) {
        config[key] = parseFloat(item.input.value);
      }
    }
    return config;
  }

  bindEvents() {
    // 1. Play / Pause
    this.btnPlayPause.addEventListener('click', () => {
      this.sim.isRunning = !this.sim.isRunning;
      this.updatePlayPauseButton();
    });

    // 2. Restart Simulation
    this.btnRestart.addEventListener('click', () => {
      this.extinctionModal.classList.add('hidden');
      this.sim.restart();
      this.sim.isRunning = true;
      this.updatePlayPauseButton();
    });

    // 3. Save current settings as custom defaults
    if (this.btnSetDefaults) {
      this.btnSetDefaults.addEventListener('click', () => {
        const currentVals = this.readSliders();
        this.configManager.saveAsNewDefaults(currentVals);
        this.sim.config = { ...this.configManager.current };
        this.showToast('✓ Saved As Custom Defaults!');
      });
    }

    // 4. Restore Defaults
    this.btnDefaults.addEventListener('click', () => {
      this.configManager.resetToDefaults();
      this.syncSlidersFromConfig();
      this.sim.config = { ...this.configManager.current };
      this.showToast('↺ Restored Defaults');
    });

    // 5. Copy JSON Config
    if (this.btnCopyJson) {
      this.btnCopyJson.addEventListener('click', () => {
        const jsonStr = JSON.stringify(this.sim.config, null, 2);
        navigator.clipboard.writeText(jsonStr).then(() => {
          this.showToast('📋 JSON Copied to Clipboard!');
        }).catch(() => {
          this.showToast('Failed to copy to clipboard');
        });
      });
    }

    // 6. Summon Rain button
    if (this.btnRain) {
      this.btnRain.addEventListener('click', () => {
        this.sim.weather.forceRain();
      });
    }

    // 7. Speed Buttons (1x, 2x, 4x)
    this.speedBtns.forEach((btn) => {
      btn.addEventListener('click', () => {
        this.speedBtns.forEach((b) => b.classList.remove('active'));
        btn.classList.add('active');
        const speed = parseFloat(btn.dataset.speed || '1');
        this.sim.speedMultiplier = speed;
      });
    });

    // 8. Spawn / Inspect Tools
    this.toolBtns.forEach((btn) => {
      btn.addEventListener('click', () => {
        this.toolBtns.forEach((b) => b.classList.remove('active'));
        btn.classList.add('active');
        this.sim.activeTool = btn.dataset.tool || 'inspect';
      });
    });

    // 9. Real-time Slider input listeners
    for (const [key, item] of Object.entries(this.sliders)) {
      if (item.input) {
        item.input.addEventListener('input', () => {
          const val = parseFloat(item.input.value);
          if (item.label) {
            item.label.textContent = item.format(val);
          }

          // Live update simulation config & persist
          const updated = this.readSliders();
          this.configManager.save(updated);
          this.sim.config = { ...this.sim.config, ...updated };
        });
      }
    }

    // 10. Canvas click interactions (Spawn or Inspect)
    this.sim.canvas.addEventListener('click', (e) => {
      const rect = this.sim.canvas.getBoundingClientRect();
      const scaleX = this.sim.canvas.width / rect.width;
      const scaleY = this.sim.canvas.height / rect.height;
      const clickX = (e.clientX - rect.left) * scaleX;
      const clickY = (e.clientY - rect.top) * scaleY;

      if (this.sim.activeTool === 'inspect') {
        this.handleInspectClick(clickX, clickY);
      } else {
        this.sim.spawnEntity(this.sim.activeTool, clickX, clickY);
      }
    });

    // 11. Extinction modal actions
    if (this.btnModalRestart) {
      this.btnModalRestart.addEventListener('click', () => {
        this.extinctionModal.classList.add('hidden');
        this.sim.restart();
        this.sim.isRunning = true;
        this.updatePlayPauseButton();
      });
    }

    if (this.btnModalReview) {
      this.btnModalReview.addEventListener('click', () => {
        this.extinctionModal.classList.add('hidden');
      });
    }

    if (this.btnCloseInspector) {
      this.btnCloseInspector.addEventListener('click', () => {
        this.sim.selectedEntity = null;
        this.inspectorPanel.classList.add('hidden');
      });
    }

    // 12. Fullscreen Screen Saver Mode
    if (this.btnFullscreen) {
      this.btnFullscreen.addEventListener('click', () => {
        this.enterFullscreen();
      });
    }

    if (this.btnExitFullscreen) {
      this.btnExitFullscreen.addEventListener('click', () => {
        this.exitFullscreen();
      });
    }

    // Keyboard ESC & browser fullscreenchange listener
    document.addEventListener('fullscreenchange', () => {
      if (!document.fullscreenElement && this.isFullscreen) {
        this.exitFullscreen(false);
      }
    });

    window.addEventListener('keydown', (e) => {
      if (e.key === 'Escape' && this.isFullscreen) {
        this.exitFullscreen();
      }
    });

    // 13. Continuous Mode Toggle
    if (this.checkContinuous) {
      this.checkContinuous.addEventListener('change', () => {
        const isChecked = this.checkContinuous.checked;
        this.sim.config.continuousMode = isChecked;
        this.configManager.save({ continuousMode: isChecked });
        if (isChecked) {
          this.extinctionModal.classList.add('hidden');
          this.showToast('📺 Continuous Screen Saver Mode Active');
        } else {
          this.showToast('Continuous Mode Disabled');
        }
      });
    }
  }

  enterFullscreen() {
    this.isFullscreen = true;
    const appLayout = document.querySelector('.app-layout');
    if (appLayout) {
      appLayout.classList.add('fullscreen-mode');
    }
    if (this.btnExitFullscreen) {
      this.btnExitFullscreen.classList.remove('hidden');
    }

    if (document.documentElement.requestFullscreen && !document.fullscreenElement) {
      document.documentElement.requestFullscreen().catch(() => {});
    }

    setTimeout(() => {
      window.dispatchEvent(new Event('resize'));
    }, 60);
  }

  exitFullscreen(requestExit = true) {
    this.isFullscreen = false;
    const appLayout = document.querySelector('.app-layout');
    if (appLayout) {
      appLayout.classList.remove('fullscreen-mode');
    }
    if (this.btnExitFullscreen) {
      this.btnExitFullscreen.classList.add('hidden');
    }

    if (requestExit && document.fullscreenElement && document.exitFullscreen) {
      document.exitFullscreen().catch(() => {});
    }

    setTimeout(() => {
      window.dispatchEvent(new Event('resize'));
    }, 60);
  }

  handleInspectClick(x, y) {
    let bestEntity = null;
    let minD = 28;

    const checkList = (list) => {
      for (let i = 0; i < list.length; i++) {
        const item = list[i];
        if (item.isDead) continue;
        const d = Math.hypot(item.x - x, item.y - y);
        if (d < minD) {
          minD = d;
          bestEntity = item;
        }
      }
    };

    checkList(this.sim.wolves);
    checkList(this.sim.sheep);
    checkList(this.sim.plants);

    this.sim.selectedEntity = bestEntity;
    this.updateInspectorPanel();
  }

  updateInspectorPanel() {
    const e = this.sim.selectedEntity;
    if (!e || e.isDead) {
      this.inspectorPanel.classList.add('hidden');
      return;
    }

    this.inspectorPanel.classList.remove('hidden');
    let html = '';

    if (e.species === 'sheep' || e.species === 'wolf') {
      const icon = e.species === 'sheep' ? '🐑' : '🐺';
      const name = e.isBaby ? `Baby ${e.species}` : `Adult ${e.species}`;
      html = `
        <div class="insp-title">${icon} ${name}</div>
        <div class="insp-row"><span>Health:</span> <span>${Math.round(e.health)}/100</span></div>
        <div class="insp-row"><span>Hunger:</span> <span>${Math.round(e.hunger)}/100</span></div>
        <div class="insp-row"><span>State:</span> <span class="capitalize">${e.actionState}</span></div>
        <div class="insp-row"><span>Age:</span> <span>${Math.round(e.age)}s</span></div>
        ${e.isBaby ? `<div class="insp-row"><span>Food for Adult:</span> <span>${e.foodEatenAsBaby}/3 meals</span></div>` : ''}
      `;
    } else {
      const isFlower = e.type === 'flower';
      html = `
        <div class="insp-title">${isFlower ? '🌸 Dense Flower Tuft' : '🌿 Grass Tuft'}</div>
        <div class="insp-row"><span>Moisture:</span> <span>${Math.round(e.moisture)}%</span></div>
        <div class="insp-row"><span>Growth:</span> <span>${Math.round(e.growth * 100)}%</span></div>
        <div class="insp-row"><span>Age:</span> <span>${Math.round(e.age)}s</span></div>
      `;
    }

    this.inspectorDetails.innerHTML = html;
  }

  updatePlayPauseButton() {
    if (this.sim.isRunning) {
      this.btnPlayPause.innerHTML = `
        <svg viewBox="0 0 24 24" width="18" height="18" fill="currentColor"><path d="M6 19h4V5H6v14zm8-14v14h4V5h-4z"/></svg>
        <span>Pause</span>
      `;
      this.btnPlayPause.classList.add('btn-active');
    } else {
      this.btnPlayPause.innerHTML = `
        <svg viewBox="0 0 24 24" width="18" height="18" fill="currentColor"><path d="M8 5v14l11-7z"/></svg>
        <span>Play</span>
      `;
      this.btnPlayPause.classList.remove('btn-active');
    }
  }

  updateHUD(stats, sheepCount, wolfCount, plantCount) {
    if (this.hudSheep) this.hudSheep.textContent = sheepCount;
    if (this.hudWolves) this.hudWolves.textContent = wolfCount;
    if (this.hudPlants) this.hudPlants.textContent = plantCount;

    if (this.hudTime) {
      const totalSec = Math.floor(stats.elapsedSimTime);
      const mins = Math.floor(totalSec / 60);
      const secs = totalSec % 60;
      this.hudTime.textContent = `${mins.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`;
    }

    if (this.hudWeather) {
      const wState = this.sim.weather.state;
      let label = '☀️ Sunny';
      if (wState === 'raining') label = '🌧️ Raining';
      else if (wState === 'cloudy') label = '☁️ Overcast';
      else if (wState === 'clearing') label = '⛅ Clearing';
      this.hudWeather.textContent = label;
    }

    // Refresh inspector if entity is active
    if (this.sim.selectedEntity) {
      this.updateInspectorPanel();
    }

    // Draw Mini Chart
    if (this.miniChartCtx && stats.history.length > 1) {
      this.drawChart(this.miniChartCtx, this.miniChartCanvas.width, this.miniChartCanvas.height, stats.history, false);
    }
  }

  showExtinctionModal(stats) {
    this.extinctionModal.classList.remove('hidden');

    const totalSec = Math.floor(stats.extinctionTime || stats.elapsedSimTime);
    const mins = Math.floor(totalSec / 60);
    const secs = totalSec % 60;
    this.extTimeSurv.textContent = `${mins}m ${secs}s`;

    this.extPeakSheep.textContent = stats.peakSheep;
    this.extPeakWolves.textContent = stats.peakWolves;
    this.extPeakPlants.textContent = stats.peakPlants;

    this.extTotalBorn.textContent = `${stats.totalSheepBorn} sheep / ${stats.totalWolvesBorn} wolves`;
    this.extWolfKills.textContent = `${stats.sheepKilledByWolves} sheep hunted (${stats.sheepStarved} starved)`;
    this.extDecayBlooms.textContent = `${stats.totalPlantsFromDecay} flower tufts`;
    this.extSeeds.textContent = `${stats.totalSeedsSprouted} seed puffs sprouted`;

    // Render large extinction history chart
    if (this.extinctionChartCtx) {
      this.drawChart(
        this.extinctionChartCtx,
        this.extinctionChartCanvas.width,
        this.extinctionChartCanvas.height,
        stats.history,
        true
      );
    }
  }

  drawChart(ctx, width, height, history, showAxes = true) {
    ctx.clearRect(0, 0, width, height);

    if (!history || history.length < 2) return;

    const padLeft = showAxes ? 45 : 4;
    const padRight = showAxes ? 20 : 4;
    const padTop = showAxes ? 25 : 4;
    const padBottom = showAxes ? 25 : 4;

    const chartW = width - padLeft - padRight;
    const chartH = height - padTop - padBottom;

    // Determine max value for Y-scaling
    let maxY = 10;
    for (let i = 0; i < history.length; i++) {
      const h = history[i];
      if (h.sheep > maxY) maxY = h.sheep;
      if (h.wolves > maxY) maxY = h.wolves;
      if (h.plants > maxY) maxY = h.plants;
    }
    maxY = Math.ceil(maxY * 1.15);

    // Background grid
    if (showAxes) {
      ctx.strokeStyle = 'rgba(255, 255, 255, 0.08)';
      ctx.lineWidth = 1;

      // Horizontal grid lines
      for (let g = 0; g <= 4; g++) {
        const yVal = Math.round((maxY / 4) * g);
        const yPos = padTop + chartH - (g / 4) * chartH;
        ctx.beginPath();
        ctx.moveTo(padLeft, yPos);
        ctx.lineTo(padLeft + chartW, yPos);
        ctx.stroke();

        ctx.fillStyle = 'rgba(255, 255, 255, 0.45)';
        ctx.font = '10px monospace';
        ctx.textAlign = 'right';
        ctx.fillText(yVal.toString(), padLeft - 6, yPos + 3);
      }
    }

    const mapX = (idx) => padLeft + (idx / (history.length - 1)) * chartW;
    const mapY = (val) => padTop + chartH - (val / maxY) * chartH;

    // Draw Line Series helper
    const drawSeries = (key, color, lineWidth = 2) => {
      ctx.strokeStyle = color;
      ctx.lineWidth = lineWidth;
      ctx.beginPath();

      for (let i = 0; i < history.length; i++) {
        const x = mapX(i);
        const y = mapY(history[i][key]);
        if (i === 0) ctx.moveTo(x, y);
        else ctx.lineTo(x, y);
      }
      ctx.stroke();
    };

    // Draw series: Plants (green), Sheep (sky blue/white), Wolves (coral red)
    drawSeries('plants', '#38D39F', showAxes ? 2.5 : 1.5);
    drawSeries('sheep', '#4CC9F0', showAxes ? 2.5 : 1.5);
    drawSeries('wolves', '#FF4D6D', showAxes ? 2.5 : 1.5);

    // Chart Legend on full chart
    if (showAxes) {
      ctx.font = '11px sans-serif';
      ctx.textAlign = 'left';

      // Sheep
      ctx.fillStyle = '#4CC9F0';
      ctx.fillRect(padLeft + 10, 10, 10, 10);
      ctx.fillStyle = '#E0E0E0';
      ctx.fillText('Sheep', padLeft + 25, 19);

      // Wolves
      ctx.fillStyle = '#FF4D6D';
      ctx.fillRect(padLeft + 85, 10, 10, 10);
      ctx.fillStyle = '#E0E0E0';
      ctx.fillText('Wolves', padLeft + 100, 19);

      // Plants
      ctx.fillStyle = '#38D39F';
      ctx.fillRect(padLeft + 165, 10, 10, 10);
      ctx.fillStyle = '#E0E0E0';
      ctx.fillText('Plants / Flowers', padLeft + 180, 19);
    }
  }
}