import { Router } from 'express';
import { eq, and } from 'drizzle-orm';
import { db } from '../db';
import { organizationSkins, organizations } from '@shared/schema';
import { authenticateToken, requirePermission, type AuthenticatedRequest } from '../middleware/auth.middleware';
import { tenantIsolation } from '../middleware/tenant.middleware';
import { BUILT_IN_SKINS, getBuiltInSkinById } from '../../client/src/themes';
import type { Skin } from '../../client/src/themes/tokens';

const router = Router();

interface SkinListItem {
  id: string;
  name: string;
  description?: string;
  isEditable: boolean;
  isBuiltIn: boolean;
  dbId?: number;
}

function serializeSkinListItem(skin: Skin, isBuiltIn: boolean, dbId?: number): SkinListItem {
  return {
    id: skin.id,
    name: skin.name,
    description: skin.description,
    isEditable: isBuiltIn ? false : true,
    isBuiltIn,
    dbId,
  };
}

// GET /api/organization/skins — список скинов (встроенные + пользовательские)
router.get('/api/organization/skins', authenticateToken, tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const customRows = await db
      .select()
      .from(organizationSkins)
      .where(eq(organizationSkins.organizationId, orgId));

    const builtInList = BUILT_IN_SKINS.map((skin) => serializeSkinListItem(skin, true));
    const customList = customRows.map((row) =>
      serializeSkinListItem({
        id: row.skinId,
        name: row.name,
        description: row.description ?? undefined,
        tokens: row.tokens as Skin['tokens'],
      } as Skin, false, row.id)
    );

    return res.json({ success: true, skins: [...builtInList, ...customList] });
  } catch (error) {
    console.error('Get organization skins error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

// GET /api/organization/skins/:id — детали скина
router.get('/api/organization/skins/:id', authenticateToken, tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const skinId = req.params.id;

    const builtIn = getBuiltInSkinById(skinId);
    if (builtIn) {
      return res.json({ success: true, skin: builtIn });
    }

    const [row] = await db
      .select()
      .from(organizationSkins)
      .where(and(eq(organizationSkins.organizationId, orgId), eq(organizationSkins.skinId, skinId)));

    if (!row) {
      return res.status(404).json({ success: false, error: 'Скин не найден' });
    }

    const skin: Skin = {
      id: row.skinId,
      name: row.name,
      description: row.description ?? undefined,
      isEditable: row.isEditable ?? true,
      tokens: row.tokens as Skin['tokens'],
    };
    return res.json({ success: true, skin });
  } catch (error) {
    console.error('Get organization skin error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

// POST /api/organization/skins — создать пользовательский скин
router.post('/api/organization/skins', authenticateToken, requirePermission('settings.manage'), tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const { skinId, name, description, tokens, baseSkinId } = req.body;

    if (!skinId || typeof skinId !== 'string') {
      return res.status(400).json({ success: false, error: 'skinId обязателен' });
    }
    if (!name || typeof name !== 'string') {
      return res.status(400).json({ success: false, error: 'Название скина обязательно' });
    }
    if (getBuiltInSkinById(skinId)) {
      return res.status(400).json({ success: false, error: 'Нельзя создать скин с id встроенного скина' });
    }

    let finalTokens = tokens;
    if (!finalTokens && baseSkinId) {
      const base = getBuiltInSkinById(baseSkinId) || await db.query.organizationSkins.findFirst({
        where: and(eq(organizationSkins.organizationId, orgId), eq(organizationSkins.skinId, baseSkinId)),
      });
      if (base) {
        finalTokens = (base as any).tokens ?? (base as Skin).tokens;
      }
    }
    if (!finalTokens) {
      return res.status(400).json({ success: false, error: 'Токены скина обязательны' });
    }

    const [row] = await db
      .insert(organizationSkins)
      .values({
        organizationId: orgId,
        skinId,
        name: name.trim(),
        description: description ?? null,
        tokens: finalTokens,
        isEditable: true,
        isActive: false,
        createdBy: req.user!.id,
      })
      .returning();

    const skin: Skin = {
      id: row.skinId,
      name: row.name,
      description: row.description ?? undefined,
      isEditable: true,
      tokens: row.tokens as Skin['tokens'],
    };
    return res.status(201).json({ success: true, skin, dbId: row.id });
  } catch (error: any) {
    if (error?.code === '23505') {
      return res.status(409).json({ success: false, error: 'Скин с таким id уже существует' });
    }
    console.error('Create organization skin error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

// PATCH /api/organization/skins/:id — обновить пользовательский скин
router.patch('/api/organization/skins/:id', authenticateToken, requirePermission('settings.manage'), tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const skinId = req.params.id;
    const { name, description, tokens } = req.body;

    if (getBuiltInSkinById(skinId)) {
      return res.status(400).json({ success: false, error: 'Встроенные скины нельзя редактировать' });
    }

    const updates: Partial<{ name: string; description: string | null; tokens: object }> = {};
    if (name !== undefined) updates.name = name.trim();
    if (description !== undefined) updates.description = description ?? null;
    if (tokens !== undefined) updates.tokens = tokens;

    const [row] = await db
      .update(organizationSkins)
      .set({ ...updates, updatedAt: new Date() })
      .where(and(eq(organizationSkins.organizationId, orgId), eq(organizationSkins.skinId, skinId)))
      .returning();

    if (!row) {
      return res.status(404).json({ success: false, error: 'Скин не найден' });
    }

    const skin: Skin = {
      id: row.skinId,
      name: row.name,
      description: row.description ?? undefined,
      isEditable: row.isEditable ?? true,
      tokens: row.tokens as Skin['tokens'],
    };
    return res.json({ success: true, skin });
  } catch (error) {
    console.error('Update organization skin error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

// DELETE /api/organization/skins/:id — удалить пользовательский скин
router.delete('/api/organization/skins/:id', authenticateToken, requirePermission('settings.manage'), tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const skinId = req.params.id;

    if (getBuiltInSkinById(skinId)) {
      return res.status(400).json({ success: false, error: 'Встроенные скины нельзя удалять' });
    }

    const [row] = await db
      .delete(organizationSkins)
      .where(and(eq(organizationSkins.organizationId, orgId), eq(organizationSkins.skinId, skinId)))
      .returning();

    if (!row) {
      return res.status(404).json({ success: false, error: 'Скин не найден' });
    }

    // Если удалён активный скин — сбрасываем на iistwin
    await db
      .update(organizations)
      .set({ activeSkinId: 'iistwin', updatedAt: new Date() })
      .where(and(eq(organizations.id, orgId), eq(organizations.activeSkinId, skinId)));

    return res.json({ success: true });
  } catch (error) {
    console.error('Delete organization skin error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

// GET /api/organization/current-skin — текущий активный скин организации
router.get('/api/organization/current-skin', authenticateToken, tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const [org] = await db
      .select({ activeSkinId: organizations.activeSkinId })
      .from(organizations)
      .where(eq(organizations.id, orgId));

    const activeSkinId = org?.activeSkinId ?? 'iistwin';
    const builtIn = getBuiltInSkinById(activeSkinId);
    if (builtIn) {
      return res.json({ success: true, skinId: activeSkinId, skin: builtIn });
    }

    const [row] = await db
      .select()
      .from(organizationSkins)
      .where(and(eq(organizationSkins.organizationId, orgId), eq(organizationSkins.skinId, activeSkinId)));

    if (!row) {
      return res.json({ success: true, skinId: 'iistwin', skin: getBuiltInSkinById('iistwin') });
    }

    const skin: Skin = {
      id: row.skinId,
      name: row.name,
      description: row.description ?? undefined,
      isEditable: row.isEditable ?? true,
      tokens: row.tokens as Skin['tokens'],
    };
    return res.json({ success: true, skinId: activeSkinId, skin });
  } catch (error) {
    console.error('Get current organization skin error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

// PUT /api/organization/current-skin — установить активный скин
router.put('/api/organization/current-skin', authenticateToken, requirePermission('settings.manage'), tenantIsolation, async (req: AuthenticatedRequest, res) => {
  try {
    const orgId = req.organizationId!;
    const { skinId } = req.body;
    if (!skinId || typeof skinId !== 'string') {
      return res.status(400).json({ success: false, error: 'skinId обязателен' });
    }

    const isBuiltIn = !!getBuiltInSkinById(skinId);
    if (!isBuiltIn) {
      const [custom] = await db
        .select({ id: organizationSkins.id })
        .from(organizationSkins)
        .where(and(eq(organizationSkins.organizationId, orgId), eq(organizationSkins.skinId, skinId)));
      if (!custom) {
        return res.status(404).json({ success: false, error: 'Скин не найден' });
      }
    }

    await db
      .update(organizations)
      .set({ activeSkinId: skinId, updatedAt: new Date() })
      .where(eq(organizations.id, orgId));

    return res.json({ success: true, skinId });
  } catch (error) {
    console.error('Set current organization skin error:', error);
    return res.status(500).json({ success: false, error: 'Внутренняя ошибка сервера' });
  }
});

export default router;