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{ sqlite } from \"https://esm.town/v/stevekrouse/sqlite\";\nimport { TABLES } from \"./migrations.ts\";\n\n// Types\nexport interface User {\n id: number;\n username: string;\n display_name: string;\n created_at: number;\n}\n\nexport interface Lesson {\n id: number;\n title: string;\n slug: string;\n description: string;\n content: string;\n order_index: number;\n difficulty: string;\n created_at: number;\n}\n\nexport interface Exercise {\n id: number;\n lesson_id: number;\n title: string;\n description: string;\n starter_code: string;\n solution_code: string;\n test_cases: string;\n order_index: number;\n difficulty: string;\n created_at: number;\n}\n\nexport interface UserProgress {\n id: number;\n user_id: number;\n lesson_id: number;\n completed: boolean;\n last_accessed: number;\n}\n\nexport interface UserSolution {\n id: number;\n user_id: number;\n exercise_id: number;\n code: string;\n is_correct: boolean;\n submitted_at: number;\n}\n\n// User queries\nexport async function getUserByUsername(username: string): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.USERS} WHERE username = ?`,\n [username]\n );\n return result.rows && result.rows.length > 0 ? result.rows[0] : null;\n}\n\nexport async function createUser(username: string, displayName: string): Promise {\n await sqlite.execute(\n `INSERT INTO ${TABLES.USERS} (username, display_name) VALUES (?, ?)`,\n [username, displayName]\n );\n return getUserByUsername(username);\n}\n\n// Lesson queries\nexport async function getAllLessons(): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.LESSONS} ORDER BY order_index ASC`\n );\n return result.rows || [];\n}\n\nexport async function getLessonBySlug(slug: string): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.LESSONS} WHERE slug = ?`,\n [slug]\n );\n return result.rows && result.rows.length > 0 ? result.rows[0] : null;\n}\n\n// Exercise queries\nexport async function getExercisesByLessonId(lessonId: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.EXERCISES} WHERE lesson_id = ? ORDER BY order_index ASC`,\n [lessonId]\n );\n return result.rows || [];\n}\n\nexport async function getExerciseById(id: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.EXERCISES} WHERE id = ?`,\n [id]\n );\n return result.rows && result.rows.length > 0 ? result.rows[0] : null;\n}\n\n// User progress queries\nexport async function getUserProgress(userId: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.USER_PROGRESS} WHERE user_id = ?`,\n [userId]\n );\n return result.rows || [];\n}\n\nexport async function updateUserProgress(\n userId: number,\n lessonId: number,\n completed: boolean\n): Promise {\n await sqlite.execute(\n `INSERT INTO ${TABLES.USER_PROGRESS} (user_id, lesson_id, completed, last_accessed)\n VALUES (?, ?, ?, unixepoch())\n ON CONFLICT(user_id, lesson_id) \n DO UPDATE SET completed = ?, last_accessed = unixepoch()`,\n [userId, lessonId, completed ? 1 : 0, completed ? 1 : 0]\n );\n}\n\n// User solution queries\nexport async function saveUserSolution(\n userId: number,\n exerciseId: number,\n code: string,\n isCorrect: boolean\n): Promise {\n await sqlite.execute(\n `INSERT INTO ${TABLES.USER_SOLUTIONS} (user_id, exercise_id, code, is_correct)\n VALUES (?, ?, ?, ?)`,\n [userId, exerciseId, code, isCorrect ? 1 : 0]\n );\n}\n\nexport async function getUserSolutions(userId: number, exerciseId: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${TABLES.USER_SOLUTIONS} \n WHERE user_id = ? AND exercise_id = ?\n ORDER BY submitted_at DESC`,\n [userId, exerciseId]\n );\n return result.rows || [];\n}\n\n// Get learning path with progress\nexport async function getLearningPathWithProgress(userId: number): Promise {\n const result = await sqlite.execute(\n `SELECT \n l.*,\n COALESCE(up.completed, 0) as completed,\n COALESCE(up.last_accessed, 0) as last_accessed,\n (SELECT COUNT(*) FROM ${TABLES.EXERCISES} WHERE lesson_id = l.id) as exercise_count,\n (SELECT COUNT(*) FROM ${TABLES.USER_SOLUTIONS} us\n JOIN ${TABLES.EXERCISES} e ON us.exercise_id = e.id\n WHERE us.user_id = ? AND e.lesson_id = l.id AND us.is_correct = 1) as completed_exercises\n FROM ${TABLES.LESSONS} l\n LEFT JOIN ${TABLES.USER_PROGRESS} up ON l.id = up.lesson_id AND up.user_id = ?\n ORDER BY l.order_index ASC`,\n [userId, userId]\n );\n return result.rows || [];\n}","deleted","label",[170,171,153],"backend","database","permalink","https://www.val.town/x/Zoe13/KidC/code/backend/database/queries.ts","extension","actionData","errors"]