import { FastifyPluginAsync } from 'fastify';
import { z } from 'zod';
import { db } from '../config/database.js';
import { contentSections } from '../db/schema.js';
import { eq } from 'drizzle-orm';
import { saveUploadedImage } from '../services/upload.service.js';
import { dropImageIfUnused, extractImageUrls } from '../services/image-refs.service.js';
import { env } from '../config/env.js';

// Fastify JSON schema for content section body
const contentBodyJsonSchema = {
  type: 'object',
  required: ['contentJson'],
  properties: {
    contentJson: {}, // allow any JSON
  },
} as const;

const contentRoute: FastifyPluginAsync = async (fastify) => {

  // Get content section
  fastify.get('/content/:section', {
    preHandler: [fastify.authenticate],
  }, async (request, reply) => {
    const { section } = request.params as { section: string };

    const [content] = await db
      .select()
      .from(contentSections)
      .where(eq(contentSections.sectionName, section))
      .limit(1);

    if (!content) {
      return reply.code(404).send({ error: 'Content section not found' });
    }

    return {
      section: content.sectionName,
      content: content.contentJson,
      updatedAt: content.updatedAt,
    };
  });

  // Update content section
  fastify.put('/content/:section', {
    schema: {
      body: contentBodyJsonSchema,
    },
    preHandler: [fastify.authenticate],
  }, async (request, reply) => {
    const { section } = request.params as { section: string };
    const { contentJson } = request.body as any;

    // Check if section exists
    const [existing] = await db
      .select()
      .from(contentSections)
      .where(eq(contentSections.sectionName, section))
      .limit(1);

    let result;

    if (existing) {
      // Update existing
      [result] = await db
        .update(contentSections)
        .set({
          contentJson,
          updatedAt: new Date(),
        })
        .where(eq(contentSections.sectionName, section))
        .returning();
    } else {
      // Create new
      [result] = await db
        .insert(contentSections)
        .values({
          sectionName: section,
          contentJson,
        })
        .returning();
    }

    // Bilder, die durch die Aenderung herausgefallen sind, wegraeumen
    const before = extractImageUrls((existing as any)?.contentJson);
    const after = extractImageUrls(result.contentJson);
    for (const url of before) {
      if (after.has(url)) continue;
      try {
        if (await dropImageIfUnused(url)) {
          fastify.log.info(`Removed unused content image ${url}`);
        }
      } catch (err) {
        fastify.log.warn({ err }, 'Could not remove unused content image');
      }
    }

    return {
      section: result.sectionName,
      content: result.contentJson,
      updatedAt: result.updatedAt,
    };
  });

  // Bild fuer einen Textbereich hochladen (Welcome-Bild, Monatshit, Whiskey)
  fastify.post('/content/upload', {
    preHandler: [fastify.authenticate],
  }, async (request, reply) => {
    try {
      const file = await (request as any).file({ limits: { fileSize: env.MAX_FILE_SIZE } });
      if (!file) {
        return reply.code(400).send({ error: 'No file uploaded' });
      }

      const mime = file.mimetype as string | undefined;
      if (!mime || !mime.startsWith('image/')) {
        return reply.code(400).send({ error: 'Only image uploads are allowed' });
      }

      const preferredName = (file.fields?.name?.value as string | undefined) || '';

      const saved = await saveUploadedImage(file, 'content', {
        preferredName,
        log: fastify.log,
      });

      return reply.code(201).send({ imageUrl: saved.imageUrl });

    } catch (err: any) {
      if (err?.statusCode === 413) {
        return reply.code(413).send({ error: err.message });
      }
      fastify.log.error({ err }, 'Upload failed');
      return reply.code(500).send({ error: 'Failed to upload image' });
    }
  });

  // List all content sections
  fastify.get('/content', {
    preHandler: [fastify.authenticate],
  }, async (request, reply) => {
    const sections = await db.select().from(contentSections);

    return {
      sections: (sections as any[]).map((s: any) => ({
        section: s.sectionName,
        content: s.contentJson,
        updatedAt: s.updatedAt,
      })),
    };
  });
};

export default contentRoute;