import { v4 as uuid } from 'uuid';
import { db } from '../../src/db/client.js';
import { categories, questions, knowledgeCards, skillTree, achievements, adminUsers } from '../../src/db/schema.js';
import { eq } from 'drizzle-orm';
import * as adminAuthService from '../../src/services/admin/admin-auth.js';

import categoriesData from '../../content/categories.json' with { type: 'json' };
import historyData from '../../content/history.json' with { type: 'json' };
import dramaData from '../../content/drama.json' with { type: 'json' };
import crosstalkData from '../../content/crosstalk.json' with { type: 'json' };
import skillTreeData from '../../content/skill-tree.json' with { type: 'json' };
import achievementsData from '../../content/achievements.json' with { type: 'json' };

interface QuestionInput {
  categoryId: string;
  contentType: string;
  difficulty: number;
  stem: { text: string };
  correctAnswer: string;
  distractors: string[];
  knowledgeCard: {
    summary: string;
    deepDive?: string;
    sourceRef?: string;
  };
}

interface SkillTreeNodeInput {
  categoryId: string;
  title: string;
  sortOrder: number;
  questionsRequired: number;
  passThreshold: number;
  parentId: string | null;
}

async function seedCategories() {
  let inserted = 0;
  let skipped = 0;

  for (const cat of categoriesData) {
    const [existing] = await db.select().from(categories).where(eq(categories.id, cat.id)).limit(1);
    if (existing) {
      skipped++;
      continue;
    }
    await db.insert(categories).values({
      id: cat.id,
      name: cat.name,
      slug: cat.slug,
      sortOrder: cat.sortOrder,
      status: cat.status,
    });
    inserted++;
  }

  console.log(`Categories: ${inserted} inserted, ${skipped} skipped`);
}

async function seedSkillTree() {
  let inserted = 0;
  let skipped = 0;
  const chapterIdMap = new Map<number, string>(); // sortOrder → id (per category)

  for (const node of skillTreeData as SkillTreeNodeInput[]) {
    // Check if chapter with same category + title already exists
    const existing = await db
      .select()
      .from(skillTree)
      .where(eq(skillTree.title, node.title))
      .limit(1);

    if (existing.length > 0) {
      chapterIdMap.set(node.sortOrder, existing[0]!.id);
      skipped++;
      continue;
    }

    const id = uuid();
    let parentId: string | null = null;

    if (node.parentId === 'DEPENDS_ON_PREVIOUS') {
      // Find the previous chapter in the same category
      const previousSortOrder = node.sortOrder - 1;
      parentId = chapterIdMap.get(previousSortOrder) ?? null;
    }

    await db.insert(skillTree).values({
      id,
      categoryId: node.categoryId,
      title: node.title,
      sortOrder: node.sortOrder,
      questionsRequired: node.questionsRequired,
      passThreshold: node.passThreshold,
      parentId,
    });

    chapterIdMap.set(node.sortOrder, id);
    inserted++;
  }

  console.log(`Skill tree: ${inserted} inserted, ${skipped} skipped`);
}

async function seedQuestions(allQuestions: QuestionInput[]) {
  let inserted = 0;
  let skipped = 0;

  for (const q of allQuestions) {
    // Check by unique combination: categoryId + correctAnswer + stem text
    const stemText = q.stem.text;
    const existing = await db
      .select()
      .from(questions)
      .where(eq(questions.correctAnswer, q.correctAnswer))
      .limit(1);

    const alreadyExists = existing.some(
      (row) => (row.stem as { text: string }).text === stemText && row.categoryId === q.categoryId,
    );

    if (alreadyExists) {
      skipped++;
      continue;
    }

    const questionId = uuid();

    await db.insert(questions).values({
      id: questionId,
      stem: q.stem,
      contentType: q.contentType as 'text',
      correctAnswer: q.correctAnswer,
      distractors: q.distractors,
      categoryId: q.categoryId,
      difficulty: q.difficulty,
      status: 'published',
    });

    if (q.knowledgeCard) {
      await db.insert(knowledgeCards).values({
        id: uuid(),
        questionId,
        summary: q.knowledgeCard.summary,
        deepDive: q.knowledgeCard.deepDive ?? null,
        sourceRef: q.knowledgeCard.sourceRef ?? null,
      });
    }

    inserted++;
  }

  console.log(`Questions: ${inserted} inserted, ${skipped} skipped`);
}

async function seedAchievements() {
  let inserted = 0;
  let skipped = 0;

  for (const a of achievementsData as Array<{
    type: string;
    name: string;
    description: string;
    iconUrl: string | null;
    condition: Record<string, number>;
  }>) {
    const existing = await db
      .select()
      .from(achievements)
      .where(eq(achievements.name, a.name))
      .limit(1);

    if (existing.length > 0) {
      skipped++;
      continue;
    }

    await db.insert(achievements).values({
      id: uuid(),
      type: a.type as 'knowledge' | 'behavior',
      name: a.name,
      description: a.description,
      iconUrl: a.iconUrl ?? null,
      condition: a.condition,
    });
    inserted++;
  }

  console.log(`Achievements: ${inserted} inserted, ${skipped} skipped`);
}

async function main() {
  console.log('Starting seed data import...\n');

  // Step 0: Admin users (no dependencies)
  await seedAdminUsers();

  // Step 1: Categories (no dependencies)
  await seedCategories();

  // Step 2: Skill tree (depends on categories)
  await seedSkillTree();

  // Step 3: Questions + Knowledge cards (depends on categories)
  const allQuestions: QuestionInput[] = [
    ...(historyData as QuestionInput[]),
    ...(dramaData as QuestionInput[]),
    ...(crosstalkData as QuestionInput[]),
  ];
  await seedQuestions(allQuestions);

  // Step 4: Achievements
  await seedAchievements();

  console.log('\nSeed data import complete!');
  process.exit(0);
}

async function seedAdminUsers() {
  // Create default admin user (username: admin, password: admin123)
  // Note: In production, change the password immediately!
  await adminAuthService.createAdminUser('admin', 'admin123', 'super_admin');
  console.log('Admin user seeded: username=admin, password=admin123 (CHANGE IN PRODUCTION!)');
}

main().catch((err) => {
  console.error('Seed failed:', err);
  process.exit(1);
});