<?php
/**
 * API Sync for TFT Design Editor
 * Handles save, load, list, delete, latest, and export_cpp actions
 */
require_once 'koneksi.php';
if (session_status() === PHP_SESSION_NONE) session_start();

header('Content-Type: application/json');

$action = $_GET['action'] ?? $_POST['action'] ?? '';

switch ($action) {

    // ========== SAVE / UPDATE DESIGN ==========
    case 'save':
        $id = intval($_POST['id'] ?? 0);
        $name = trim($_POST['name'] ?? 'Untitled');
        $json = $_POST['design_json'] ?? '';

        if (empty($json)) {
            echo json_encode(['status' => 'error', 'message' => 'design_json is required']);
            exit;
        }

        $hash = md5($json);

        if ($id > 0) {
            // Update existing
            $stmt = $pdo->prepare("UPDATE tft_designs SET name = ?, design_json = ?, version_hash = ? WHERE id = ?");
            $stmt->execute([$name, $json, $hash, $id]);
            echo json_encode(['status' => 'success', 'message' => 'Design updated', 'id' => $id, 'version_hash' => $hash]);
        } else {
            // Insert new
            $stmt = $pdo->prepare("INSERT INTO tft_designs (name, design_json, version_hash) VALUES (?, ?, ?)");
            $stmt->execute([$name, $json, $hash]);
            $newId = $pdo->lastInsertId();
            echo json_encode(['status' => 'success', 'message' => 'Design saved', 'id' => intval($newId), 'version_hash' => $hash]);
        }
        break;

    // ========== LOAD DESIGN BY ID ==========
    case 'load':
        $id = intval($_GET['id'] ?? 0);
        if ($id <= 0) {
            echo json_encode(['status' => 'error', 'message' => 'Invalid ID']);
            exit;
        }
        $stmt = $pdo->prepare("SELECT * FROM tft_designs WHERE id = ?");
        $stmt->execute([$id]);
        $row = $stmt->fetch();
        if ($row) {
            echo json_encode(['status' => 'success', 'data' => $row]);
        } else {
            echo json_encode(['status' => 'error', 'message' => 'Design not found']);
        }
        break;

    // ========== LIST ALL DESIGNS ==========
    case 'list':
        $stmt = $pdo->query("SELECT id, name, version_hash, created_at, updated_at FROM tft_designs ORDER BY updated_at DESC");
        $rows = $stmt->fetchAll();
        echo json_encode(['status' => 'success', 'data' => $rows]);
        break;

    // ========== DELETE DESIGN ==========
    case 'delete':
        $id = intval($_POST['id'] ?? 0);
        if ($id <= 0) {
            echo json_encode(['status' => 'error', 'message' => 'Invalid ID']);
            exit;
        }
        $stmt = $pdo->prepare("DELETE FROM tft_designs WHERE id = ?");
        $stmt->execute([$id]);
        echo json_encode(['status' => 'success', 'message' => 'Design deleted']);
        break;

    // ========== LATEST DESIGN (for ESP32 polling) ==========
    case 'latest':
        $stmt = $pdo->query("SELECT id, name, design_json, version_hash, updated_at FROM tft_designs ORDER BY updated_at DESC LIMIT 1");
        $row = $stmt->fetch();
        if ($row) {
            // Parse the design_json to get the active screen elements
            $designData = json_decode($row['design_json'], true);
            $activeScreen = $_GET['screen'] ?? '0';
            $elements = [];
            if (isset($designData['screens'][$activeScreen]['objects'])) {
                $elements = $designData['screens'][$activeScreen]['objects'];
            } elseif (isset($designData['screens']) && count($designData['screens']) > 0) {
                $firstScreen = reset($designData['screens']);
                $elements = $firstScreen['objects'] ?? [];
            }
            echo json_encode([
                'status' => 'success',
                'version_hash' => $row['version_hash'],
                'screen_count' => isset($designData['screens']) ? count($designData['screens']) : 0,
                'elements' => $elements
            ]);
        } else {
            echo json_encode(['status' => 'empty', 'message' => 'No designs found']);
        }
        break;

    // ========== EXPORT C++ CODE (Component-Based) ==========
    case 'export_cpp':
        $json = $_POST['design_json'] ?? '';
        if (empty($json)) {
            echo json_encode(['status' => 'error', 'message' => 'design_json is required']);
            exit;
        }

        $designData = json_decode($json, true);
        if (!$designData || !isset($designData['screens'])) {
            echo json_encode(['status' => 'error', 'message' => 'Invalid JSON structure']);
            exit;
        }

        $orientation = $designData['orientation'] ?? 'landscape';
        $rotation = $orientation === 'landscape' ? 1 : 0;

        $cpp = "// Auto-generated TFT UI Code (Component-Based)\n";
        $cpp .= "// Generated: " . date('Y-m-d H:i:s') . "\n";
        $cpp .= "// Library: TFT_eSPI\n\n";
        $cpp .= "#include <TFT_eSPI.h>\n";
        $cpp .= "TFT_eSPI tft = TFT_eSPI();\n\n";

        $cpp .= "uint16_t hexToRGB565(uint32_t hex) {\n";
        $cpp .= "  uint8_t r = (hex >> 16) & 0xFF;\n";
        $cpp .= "  uint8_t g = (hex >> 8) & 0xFF;\n";
        $cpp .= "  uint8_t b = hex & 0xFF;\n";
        $cpp .= "  return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);\n";
        $cpp .= "}\n\n";

        // Recursive function to generate C++ for components
        function generateCompCpp($comp, $offX = 0, $offY = 0) {
            $code = '';
            $type = $comp['type'] ?? '';
            $x = intval($comp['x'] ?? 0) + $offX;
            $y = intval($comp['y'] ?? 0) + $offY;
            $w = intval($comp['w'] ?? 0);
            $h = intval($comp['h'] ?? 0);
            $bg = str_replace('#', '0x', $comp['bg'] ?? '#1e2223');
            $r = intval($comp['radius'] ?? 0);
            $border = intval($comp['border'] ?? 0);
            $borderColor = str_replace('#', '0x', $comp['borderColor'] ?? '#444444');
            $label = $comp['label'] ?? $type;

            $code .= "  // [{$label}] {$type}\n";

            // Draw background (skip transparent)
            if (($comp['bg'] ?? '') !== 'transparent' && ($comp['bg'] ?? '') !== '') {
                if ($r > 0) {
                    $code .= "  tft.fillRoundRect({$x}, {$y}, {$w}, {$h}, {$r}, hexToRGB565({$bg}));\n";
                } else {
                    $code .= "  tft.fillRect({$x}, {$y}, {$w}, {$h}, hexToRGB565({$bg}));\n";
                }
            }

            // Draw border
            if ($border > 0) {
                if ($r > 0) {
                    $code .= "  tft.drawRoundRect({$x}, {$y}, {$w}, {$h}, {$r}, hexToRGB565({$borderColor}));\n";
                } else {
                    $code .= "  tft.drawRect({$x}, {$y}, {$w}, {$h}, hexToRGB565({$borderColor}));\n";
                }
            }

            // Type-specific rendering
            switch ($type) {
                case 'button':
                case 'label':
                case 'datavalue':
                    if (!empty($comp['text'])) {
                        $text = addcslashes($comp['text'], '"\\');
                        $txtColor = str_replace('#', '0x', $comp['textColor'] ?? '#FFFFFF');
                        $fontSize = intval($comp['fontSize'] ?? 12);
                        $tftSize = max(1, intval($fontSize / 8));
                        $align = $comp['textAlign'] ?? 'center';
                        $code .= "  tft.setTextSize({$tftSize});\n";
                        $code .= "  tft.setTextColor(hexToRGB565({$txtColor}));\n";
                        if ($align === 'center') {
                            $code .= "  tft.setTextDatum(MC_DATUM);\n";
                            $tx = $x + intval($w / 2);
                            $ty = $y + intval($h / 2);
                        } elseif ($align === 'right') {
                            $code .= "  tft.setTextDatum(MR_DATUM);\n";
                            $tx = $x + $w - 4;
                            $ty = $y + intval($h / 2);
                        } else {
                            $code .= "  tft.setTextDatum(ML_DATUM);\n";
                            $tx = $x + 4;
                            $ty = $y + intval($h / 2);
                        }
                        $code .= "  tft.drawString(\"{$text}\", {$tx}, {$ty});\n";
                        $code .= "  tft.setTextDatum(TL_DATUM);\n";
                    }
                    break;

                case 'icon':
                    if (!empty($comp['icon'])) {
                        $icon = addcslashes($comp['icon'], '"\\');
                        $txtColor = str_replace('#', '0x', $comp['textColor'] ?? '#FFD700');
                        $fontSize = intval($comp['fontSize'] ?? 18);
                        $tftSize = max(1, intval($fontSize / 8));
                        $code .= "  tft.setTextSize({$tftSize});\n";
                        $code .= "  tft.setTextColor(hexToRGB565({$txtColor}));\n";
                        $code .= "  tft.setTextDatum(MC_DATUM);\n";
                        $code .= "  tft.drawString(\"{$icon}\", " . ($x + intval($w/2)) . ", " . ($y + intval($h/2)) . ");\n";
                        $code .= "  tft.setTextDatum(TL_DATUM);\n";
                    }
                    break;

                case 'toggle':
                    $on = ($comp['toggleState'] ?? true) ? 'true' : 'false';
                    $knobR = intval($h / 2) - 2;
                    $knobX = ($comp['toggleState'] ?? true) ? ($x + $w - intval($h/2)) : ($x + intval($h/2));
                    $code .= "  tft.fillCircle({$knobX}, " . ($y + intval($h/2)) . ", {$knobR}, hexToRGB565(0xFFFFFF));\n";
                    break;

                case 'progressbar':
                    $pct = intval($comp['value'] ?? 60);
                    $pw = intval($w * $pct / 100);
                    $barColor = str_replace('#', '0x', $comp['barColor'] ?? '#4B49AC');
                    $code .= "  tft.fillRoundRect({$x}, {$y}, {$pw}, {$h}, {$r}, hexToRGB565({$barColor}));\n";
                    break;
            }

            // Recursively render children
            if (!empty($comp['children'])) {
                foreach ($comp['children'] as $child) {
                    $code .= generateCompCpp($child, $x, $y);
                }
            }

            return $code;
        }

        foreach ($designData['screens'] as $idx => $screen) {
            $screenName = preg_replace('/[^a-zA-Z0-9_]/', '_', $screen['name'] ?? 'Screen_' . $idx);
            $cpp .= "void draw_{$screenName}() {\n";
            $cpp .= "  tft.fillScreen(TFT_BLACK);\n\n";

            if (isset($screen['components'])) {
                foreach ($screen['components'] as $comp) {
                    $cpp .= generateCompCpp($comp);
                    $cpp .= "\n";
                }
            }
            $cpp .= "}\n\n";
        }

        $cpp .= "void setup() {\n";
        $cpp .= "  tft.init();\n";
        $cpp .= "  tft.setRotation({$rotation});\n";
        $cpp .= "  draw_" . preg_replace('/[^a-zA-Z0-9_]/', '_', $designData['screens'][0]['name'] ?? 'Screen_0') . "();\n";
        $cpp .= "}\n\n";
        $cpp .= "void loop() {\n";
        $cpp .= "  // Touch or interaction handling here\n";
        $cpp .= "}\n";

        echo json_encode(['status' => 'success', 'code' => $cpp]);
        break;

    // ========== PUSH STATE FROM ESP32 ==========
    case 'push':
        $rawInput = file_get_contents('php://input');
        $data = json_decode($rawInput, true);
        if (!$data) {
            // Try POST fallback
            $data = json_decode($_POST['design_json'] ?? '', true);
        }
        if (!$data || !isset($data['screens'])) {
            echo json_encode(['status' => 'error', 'message' => 'Invalid JSON. Must contain screens array.']);
            exit;
        }
        $name = $data['projectName'] ?? 'ESP32 Design';
        $json = json_encode($data);
        $hash = md5($json);

        // Check if there is an existing design to update
        $existing = $pdo->query("SELECT id FROM tft_designs ORDER BY updated_at DESC LIMIT 1")->fetch();
        if ($existing) {
            $stmt = $pdo->prepare("UPDATE tft_designs SET name = ?, design_json = ?, version_hash = ? WHERE id = ?");
            $stmt->execute([$name, $json, $hash, $existing['id']]);
            echo json_encode(['status' => 'success', 'message' => 'Design updated from ESP32', 'id' => $existing['id'], 'version_hash' => $hash]);
        } else {
            $stmt = $pdo->prepare("INSERT INTO tft_designs (name, design_json, version_hash) VALUES (?, ?, ?)");
            $stmt->execute([$name, $json, $hash]);
            $newId = $pdo->lastInsertId();
            echo json_encode(['status' => 'success', 'message' => 'Design pushed from ESP32', 'id' => intval($newId), 'version_hash' => $hash]);
        }
        break;

    default:
        echo json_encode(['status' => 'error', 'message' => 'Unknown action: ' . $action]);
        break;
}