import { FakeShader } from './FakeShader';
import { Storage } from './Storage';

class BitfielderApp {
    private shader: FakeShader;
    private canvas: HTMLCanvasElement;
    private editor: HTMLTextAreaElement;
    private isAnimating: boolean = false;
    private uiVisible: boolean = true;
    private performanceWarning: HTMLElement;
    private libraryOpen: boolean = false;

    constructor() {
        this.canvas = document.getElementById('canvas') as HTMLCanvasElement;
        this.editor = document.getElementById('editor') as HTMLTextAreaElement;
        this.performanceWarning = document.getElementById('performance-warning') as HTMLElement;
        
        this.loadSettings();
        this.setupCanvas();
        this.shader = new FakeShader(this.canvas, this.editor.value);
        
        this.setupEventListeners();
        this.loadFromURL();
        this.renderShaderLibrary();
        this.render();
        
        window.addEventListener('resize', () => this.setupCanvas());
        window.addEventListener('beforeunload', () => this.saveCurrentShader());
    }

    private setupCanvas(): void {
        // Calculate the actual available space
        const width = window.innerWidth;
        const height = this.uiVisible ? 
            window.innerHeight - 180 : // subtract topbar (40px) and editor panel (140px)
            window.innerHeight; // full height when UI is hidden
        
        // Get resolution scale from dropdown
        const resolutionSelect = document.getElementById('resolution-select') as HTMLSelectElement;
        const scale = parseInt(resolutionSelect.value) || 1;
        
        // Set canvas internal size with resolution scaling
        this.canvas.width = Math.floor(width / scale);
        this.canvas.height = Math.floor(height / scale);
        
        console.log(`Canvas setup: ${this.canvas.width}x${this.canvas.height} (scale: ${scale}x), UI visible: ${this.uiVisible}`);
    }

    private setupEventListeners(): void {
        const helpBtn = document.getElementById('help-btn')!;
        const fullscreenBtn = document.getElementById('fullscreen-btn')!;
        const hideUiBtn = document.getElementById('hide-ui-btn')!;
        const showUiBtn = document.getElementById('show-ui-btn')!;
        const randomBtn = document.getElementById('random-btn')!;
        const shareBtn = document.getElementById('share-btn')!;
        const resolutionSelect = document.getElementById('resolution-select') as HTMLSelectElement;
        const fpsSelect = document.getElementById('fps-select') as HTMLSelectElement;
        const helpPopup = document.getElementById('help-popup')!;
        const closeBtn = helpPopup.querySelector('.close-btn')!;
        
        // Library elements
        const saveShaderBtn = document.getElementById('save-shader-btn')!;
        const shaderNameInput = document.getElementById('shader-name-input') as HTMLInputElement;
        const shaderSearchInput = document.getElementById('shader-search-input') as HTMLInputElement;

        helpBtn.addEventListener('click', () => this.showHelp());
        fullscreenBtn.addEventListener('click', () => this.toggleFullscreen());
        hideUiBtn.addEventListener('click', () => this.toggleUI());
        showUiBtn.addEventListener('click', () => this.showUI());
        randomBtn.addEventListener('click', () => this.generateRandom());
        shareBtn.addEventListener('click', () => this.shareURL());
        resolutionSelect.addEventListener('change', () => this.updateResolution());
        fpsSelect.addEventListener('change', () => this.updateFPS());
        closeBtn.addEventListener('click', () => this.hideHelp());
        
        // Library events
        saveShaderBtn.addEventListener('click', () => this.saveCurrentShader());
        shaderNameInput.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') {
                this.saveCurrentShader();
            }
        });
        shaderSearchInput.addEventListener('input', () => this.renderShaderLibrary());
        

        // Close help popup when clicking outside
        helpPopup.addEventListener('click', (e) => {
            if (e.target === helpPopup) {
                this.hideHelp();
            }
        });

        this.editor.addEventListener('keydown', (e) => {
            if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
                e.preventDefault();
                this.shader.setCode(this.editor.value);
                this.render();
            }
        });


        document.addEventListener('keydown', (e) => {
            if (e.key === 'F11') {
                e.preventDefault();
                this.toggleFullscreen();
            } else if (e.key === 'h' || e.key === 'H') {
                if (!this.editor.matches(':focus')) {
                    this.toggleUI();
                }
            } else if (e.key === 'r' || e.key === 'R') {
                if (!this.editor.matches(':focus')) {
                    this.generateRandom();
                }
            } else if (e.key === 's' || e.key === 'S') {
                if (!this.editor.matches(':focus')) {
                    this.shareURL();
                }
            } else if (e.key === '?') {
                if (!this.editor.matches(':focus')) {
                    this.showHelp();
                }
            } else if (e.key === 'Escape') {
                this.hideHelp();
                this.showUI();
            }
        });

        window.addEventListener('hashchange', () => this.loadFromURL());
        
        // Listen for performance warnings
        window.addEventListener('message', (e) => {
            if (e.data === 'performance-warning') {
                this.showPerformanceWarning();
            }
        });
    }

    private render(): void {
        const hasTime = this.editor.value.includes('t');
        
        if (hasTime && !this.isAnimating) {
            this.isAnimating = true;
            this.shader.startAnimation();
        } else if (!hasTime && this.isAnimating) {
            this.isAnimating = false;
            this.shader.stopAnimation();
            this.shader.render(false);
        } else if (!hasTime) {
            this.shader.render(false);
        }
    }

    private toggleFullscreen(): void {
        if (!document.fullscreenElement) {
            document.documentElement.requestFullscreen();
        } else {
            document.exitFullscreen();
        }
    }

    private toggleUI(): void {
        this.uiVisible = !this.uiVisible;
        const topbar = document.getElementById('topbar')!;
        const editorPanel = document.getElementById('editor-panel')!;
        const editor = document.getElementById('editor')!;
        const showUiBtn = document.getElementById('show-ui-btn')!;
        
        if (this.uiVisible) {
            // Show full UI
            topbar.classList.remove('hidden');
            editorPanel.classList.remove('minimal');
            editor.classList.remove('minimal');
            showUiBtn.style.display = 'none';
        } else {
            // Hide topbar, make editor minimal
            topbar.classList.add('hidden');
            editorPanel.classList.add('minimal');
            editor.classList.add('minimal');
            showUiBtn.style.display = 'block';
        }
        
        // Recalculate canvas size when UI is hidden/shown
        this.setupCanvas();
    }

    private showUI(): void {
        this.uiVisible = true;
        const topbar = document.getElementById('topbar')!;
        const editorPanel = document.getElementById('editor-panel')!;
        const editor = document.getElementById('editor')!;
        const showUiBtn = document.getElementById('show-ui-btn')!;
        
        topbar.classList.remove('hidden');
        editorPanel.classList.remove('minimal');
        editor.classList.remove('minimal');
        showUiBtn.style.display = 'none';
        
        // Recalculate canvas size when UI is shown
        this.setupCanvas();
    }

    private showHelp(): void {
        const helpPopup = document.getElementById('help-popup')!;
        helpPopup.style.display = 'block';
    }

    private hideHelp(): void {
        const helpPopup = document.getElementById('help-popup')!;
        helpPopup.style.display = 'none';
    }

    private showPerformanceWarning(): void {
        this.performanceWarning.style.display = 'block';
        setTimeout(() => {
            this.performanceWarning.style.display = 'none';
        }, 3000);
    }

    private shareURL(): void {
        const encoded = btoa(this.editor.value);
        window.location.hash = encoded;
        
        navigator.clipboard.writeText(window.location.href).then(() => {
            console.log('URL copied to clipboard');
        }).catch(() => {
            console.log('Copy failed');
        });
    }

    private loadFromURL(): void {
        if (window.location.hash) {
            try {
                const decoded = atob(window.location.hash.substring(1));
                this.editor.value = decoded;
                this.shader.setCode(decoded);
                this.render();
            } catch (e) {
                console.error('Failed to decode URL hash:', e);
            }
        }
    }

    private updateResolution(): void {
        this.setupCanvas();
        Storage.saveSettings({ resolution: parseInt((document.getElementById('resolution-select') as HTMLSelectElement).value) });
    }

    private updateFPS(): void {
        const fpsSelect = document.getElementById('fps-select') as HTMLSelectElement;
        const fps = parseInt(fpsSelect.value);
        this.shader.setTargetFPS(fps);
        Storage.saveSettings({ fps });
    }

    private loadSettings(): void {
        const settings = Storage.getSettings();
        
        // Apply settings to UI
        (document.getElementById('resolution-select') as HTMLSelectElement).value = settings.resolution.toString();
        (document.getElementById('fps-select') as HTMLSelectElement).value = settings.fps.toString();
        
        // Load last shader code if no URL hash
        if (!window.location.hash) {
            this.editor.value = settings.lastShaderCode;
        }
    }

    private saveCurrentShader(): void {
        const nameInput = document.getElementById('shader-name-input') as HTMLInputElement;
        const name = nameInput.value.trim();
        const code = this.editor.value.trim();
        
        if (!code) return;
        
        Storage.saveShader(name, code);
        nameInput.value = '';
        this.renderShaderLibrary();
        
        // Save as last used shader
        Storage.saveSettings({ lastShaderCode: code });
    }

    private renderShaderLibrary(): void {
        const shaderList = document.getElementById('shader-list')!;
        const searchInput = document.getElementById('shader-search-input') as HTMLInputElement;
        const searchTerm = searchInput.value.toLowerCase().trim();
        
        let shaders = Storage.getShaders();
        
        // Filter by search term
        if (searchTerm) {
            shaders = shaders.filter(shader => 
                shader.name.toLowerCase().includes(searchTerm) ||
                shader.code.toLowerCase().includes(searchTerm)
            );
        }
        
        if (shaders.length === 0) {
            const message = searchTerm ? 'No shaders match your search' : 'No saved shaders';
            shaderList.innerHTML = `<div style="padding: 20px; text-align: center; color: #666; font-size: 12px;">${message}</div>`;
            return;
        }
        
        shaderList.innerHTML = shaders.map(shader => `
            <div class="shader-item">
                <div class="shader-item-header" onclick="app.loadShader('${shader.id}')">
                    <span class="shader-name" id="name-${shader.id}">${this.escapeHtml(shader.name)}</span>
                    <div class="shader-actions">
                        <button class="shader-action rename" onclick="event.stopPropagation(); app.startRename('${shader.id}')" title="Rename">edit</button>
                        <button class="shader-action delete" onclick="event.stopPropagation(); app.deleteShader('${shader.id}')" title="Delete">del</button>
                    </div>
                </div>
                <div class="shader-code">${this.escapeHtml(shader.code)}</div>
            </div>
        `).join('');
    }

    private escapeHtml(text: string): string {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }



    // Public methods for global access
    loadShader(id: string): void {
        const shaders = Storage.getShaders();
        const shader = shaders.find(s => s.id === id);
        if (shader) {
            this.editor.value = shader.code;
            this.shader.setCode(shader.code);
            this.render();
            Storage.updateShaderUsage(id);
            this.renderShaderLibrary(); // Refresh to update order
        }
    }

    deleteShader(id: string): void {
        Storage.deleteShader(id);
        this.renderShaderLibrary();
    }

    startRename(id: string): void {
        const nameElement = document.getElementById(`name-${id}`);
        if (!nameElement) return;
        
        const shaders = Storage.getShaders();
        const shader = shaders.find(s => s.id === id);
        if (!shader) return;
        
        // Replace span with input
        const input = document.createElement('input');
        input.type = 'text';
        input.value = shader.name;
        input.style.cssText = `
            background: rgba(255, 255, 255, 0.2);
            border: 1px solid #666;
            color: #fff;
            padding: 2px 4px;
            border-radius: 2px;
            font-family: monospace;
            font-size: 12px;
            width: 100%;
        `;
        
        nameElement.replaceWith(input);
        input.focus();
        input.select();
        
        const finishRename = () => {
            const newName = input.value.trim();
            if (newName && newName !== shader.name) {
                Storage.renameShader(id, newName);
            }
            this.renderShaderLibrary();
        };
        
        input.addEventListener('blur', finishRename);
        input.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') {
                e.preventDefault();
                finishRename();
            } else if (e.key === 'Escape') {
                e.preventDefault();
                this.renderShaderLibrary();
            }
        });
    }

    renameShader(id: string): void {
        // This method is kept for backward compatibility but now uses startRename
        this.startRename(id);
    }

    private generateRandom(): void {
        const randomCode = FakeShader.generateRandomCode();
        this.editor.value = randomCode;
        this.shader.setCode(randomCode);
        this.render();
    }
}

const app = new BitfielderApp();
(window as any).app = app;