/**
 * Schema Configuration Service
 * 
 * Manages schema and object type configuration for syncing.
 * Discovers schemas and object types from Jira Assets API and allows
 * enabling/disabling specific object types for synchronization.
 */

import { logger } from './logger.js';
import { normalizedCacheStore } from './normalizedCacheStore.js';
import { config } from '../config/env.js';
import { toPascalCase } from './schemaUtils.js';
import type { DatabaseAdapter } from './database/interface.js';

export interface JiraSchema {
  id: number;
  name: string;
  description?: string;
  objectTypeCount?: number;
}

export interface JiraObjectType {
  id: number;
  name: string;
  description?: string;
  objectCount?: number;
  objectSchemaId: number;
  parentObjectTypeId?: number;
  inherited?: boolean;
  abstractObjectType?: boolean;
}

export interface ConfiguredObjectType {
  id: string; // "schemaId:objectTypeId"
  schemaId: string;
  schemaName: string;
  objectTypeId: number;
  objectTypeName: string;
  displayName: string;
  description: string | null;
  objectCount: number;
  enabled: boolean;
  discoveredAt: string;
  updatedAt: string;
}

class SchemaConfigurationService {
  constructor() {
    // Configuration service - no API calls needed, uses database only
  }

  /**
   * NOTE: Schema discovery is now handled by SchemaSyncService.
   * This service only manages configuration (enabling/disabling object types).
   * Use schemaSyncService.syncAll() to discover and sync schemas, object types, and attributes.
   */

  /**
   * Get all configured object types grouped by schema
   */
  async getConfiguredObjectTypes(): Promise<Array<{
    schemaId: string;
    schemaName: string;
    objectTypes: ConfiguredObjectType[];
  }>> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    const rows = await db.query<{
      id: number;
      schema_id: number;
      jira_schema_id: string;
      schema_name: string;
      jira_type_id: number;
      type_name: string;
      display_name: string;
      description: string | null;
      object_count: number;
      enabled: boolean | number;
      discovered_at: string;
      updated_at: string;
    }>(`
      SELECT 
        ot.id,
        ot.schema_id,
        s.jira_schema_id,
        s.name as schema_name,
        ot.jira_type_id,
        ot.type_name,
        ot.display_name,
        ot.description,
        ot.object_count,
        ot.enabled,
        ot.discovered_at,
        ot.updated_at
      FROM object_types ot
      JOIN schemas s ON ot.schema_id = s.id
      ORDER BY s.name ASC, ot.display_name ASC
    `);

    // Group by schema
    const schemaMap = new Map<string, ConfiguredObjectType[]>();

    for (const row of rows) {
      const objectType: ConfiguredObjectType = {
        id: `${row.jira_schema_id}:${row.jira_type_id}`, // Keep same format for compatibility
        schemaId: row.jira_schema_id,
        schemaName: row.schema_name,
        objectTypeId: row.jira_type_id,
        objectTypeName: row.type_name,
        displayName: row.display_name,
        description: row.description,
        objectCount: row.object_count,
        enabled: typeof row.enabled === 'boolean' ? row.enabled : row.enabled === 1,
        discoveredAt: row.discovered_at,
        updatedAt: row.updated_at,
      };

      if (!schemaMap.has(row.jira_schema_id)) {
        schemaMap.set(row.jira_schema_id, []);
      }
      schemaMap.get(row.jira_schema_id)!.push(objectType);
    }

    // Convert to array
    return Array.from(schemaMap.entries()).map(([schemaId, objectTypes]) => {
      const firstType = objectTypes[0];
      return {
        schemaId,
        schemaName: firstType.schemaName,
        objectTypes,
      };
    });
  }

  /**
   * Set enabled status for an object type
   * id format: "schemaId:objectTypeId" (e.g., "6:123")
   */
  async setObjectTypeEnabled(id: string, enabled: boolean): Promise<void> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    // Parse id: "schemaId:objectTypeId"
    const [schemaIdStr, objectTypeIdStr] = id.split(':');
    if (!schemaIdStr || !objectTypeIdStr) {
      throw new Error(`Invalid object type id format: ${id}. Expected format: "schemaId:objectTypeId"`);
    }

    const objectTypeId = parseInt(objectTypeIdStr, 10);
    if (isNaN(objectTypeId)) {
      throw new Error(`Invalid object type id: ${objectTypeIdStr}`);
    }

    // Get schema_id (FK) from schemas table
    const schemaRow = await db.queryOne<{ id: number }>(
      `SELECT id FROM schemas WHERE jira_schema_id = ?`,
      [schemaIdStr]
    );

    if (!schemaRow) {
      throw new Error(`Schema ${schemaIdStr} not found`);
    }

    // Check if type_name is missing and try to fix it if enabling
    const currentType = await db.queryOne<{ type_name: string | null; display_name: string }>(
      `SELECT type_name, display_name FROM object_types WHERE schema_id = ? AND jira_type_id = ?`,
      [schemaRow.id, objectTypeId]
    );
    
    let typeNameToSet = currentType?.type_name;
    const needsTypeNameFix = enabled && (!typeNameToSet || typeNameToSet.trim() === '');
    
    if (needsTypeNameFix && currentType?.display_name) {
      // Try to generate type_name from display_name (PascalCase)
      const { toPascalCase } = await import('./schemaUtils.js');
      typeNameToSet = toPascalCase(currentType.display_name);
      logger.warn(`SchemaConfiguration: Type ${id} has missing type_name. Auto-generating "${typeNameToSet}" from display_name "${currentType.display_name}"`);
    }
    
    const now = new Date().toISOString();

    if (db.isPostgres) {
      if (needsTypeNameFix && typeNameToSet) {
        await db.execute(`
          UPDATE object_types
          SET enabled = ?, type_name = ?, updated_at = ?
          WHERE schema_id = ? AND jira_type_id = ?
        `, [enabled, typeNameToSet, now, schemaRow.id, objectTypeId]);
        logger.info(`SchemaConfiguration: Set object type ${id} enabled=${enabled} and fixed missing type_name to "${typeNameToSet}"`);
      } else {
        await db.execute(`
          UPDATE object_types
          SET enabled = ?, updated_at = ?
          WHERE schema_id = ? AND jira_type_id = ?
        `, [enabled, now, schemaRow.id, objectTypeId]);
        logger.info(`SchemaConfiguration: Set object type ${id} enabled=${enabled}`);
      }
    } else {
      if (needsTypeNameFix && typeNameToSet) {
        await db.execute(`
          UPDATE object_types
          SET enabled = ?, type_name = ?, updated_at = ?
          WHERE schema_id = ? AND jira_type_id = ?
        `, [enabled ? 1 : 0, typeNameToSet, now, schemaRow.id, objectTypeId]);
        logger.info(`SchemaConfiguration: Set object type ${id} enabled=${enabled} and fixed missing type_name to "${typeNameToSet}"`);
      } else {
        await db.execute(`
          UPDATE object_types
          SET enabled = ?, updated_at = ?
          WHERE schema_id = ? AND jira_type_id = ?
        `, [enabled ? 1 : 0, now, schemaRow.id, objectTypeId]);
        logger.info(`SchemaConfiguration: Set object type ${id} enabled=${enabled}`);
      }
    }
  }

  /**
   * Bulk update enabled status for multiple object types
   */
  async bulkSetObjectTypesEnabled(updates: Array<{ id: string; enabled: boolean }>): Promise<void> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    const now = new Date().toISOString();

    await db.transaction(async (txDb: DatabaseAdapter) => {
      for (const update of updates) {
        // Parse id: "schemaId:objectTypeId"
        const [schemaIdStr, objectTypeIdStr] = update.id.split(':');
        if (!schemaIdStr || !objectTypeIdStr) {
          logger.warn(`SchemaConfiguration: Invalid object type id format: ${update.id}`);
          continue;
        }

        const objectTypeId = parseInt(objectTypeIdStr, 10);
        if (isNaN(objectTypeId)) {
          logger.warn(`SchemaConfiguration: Invalid object type id: ${objectTypeIdStr}`);
          continue;
        }

        // Get schema_id (FK) from schemas table
        const schemaRow = await txDb.queryOne<{ id: number }>(
          `SELECT id FROM schemas WHERE jira_schema_id = ?`,
          [schemaIdStr]
        );

        if (!schemaRow) {
          logger.warn(`SchemaConfiguration: Schema ${schemaIdStr} not found`);
          continue;
        }

        // Check if type_name is missing and try to fix it if enabling
        const currentType = await txDb.queryOne<{ type_name: string | null; display_name: string }>(
          `SELECT type_name, display_name FROM object_types WHERE schema_id = ? AND jira_type_id = ?`,
          [schemaRow.id, objectTypeId]
        );
        
        let typeNameToSet = currentType?.type_name;
        const needsTypeNameFix = update.enabled && (!typeNameToSet || typeNameToSet.trim() === '');
        
        if (needsTypeNameFix && currentType?.display_name) {
          // Try to generate type_name from display_name (PascalCase)
          const { toPascalCase } = await import('./schemaUtils.js');
          typeNameToSet = toPascalCase(currentType.display_name);
          logger.warn(`SchemaConfiguration: Type ${update.id} has missing type_name. Auto-generating "${typeNameToSet}" from display_name "${currentType.display_name}"`);
        }

        if (txDb.isPostgres) {
          if (needsTypeNameFix && typeNameToSet) {
            await txDb.execute(`
              UPDATE object_types
              SET enabled = ?, type_name = ?, updated_at = ?
              WHERE schema_id = ? AND jira_type_id = ?
            `, [update.enabled, typeNameToSet, now, schemaRow.id, objectTypeId]);
          } else {
            await txDb.execute(`
              UPDATE object_types
              SET enabled = ?, updated_at = ?
              WHERE schema_id = ? AND jira_type_id = ?
            `, [update.enabled, now, schemaRow.id, objectTypeId]);
          }
        } else {
          if (needsTypeNameFix && typeNameToSet) {
            await txDb.execute(`
              UPDATE object_types
              SET enabled = ?, type_name = ?, updated_at = ?
              WHERE schema_id = ? AND jira_type_id = ?
            `, [update.enabled ? 1 : 0, typeNameToSet, now, schemaRow.id, objectTypeId]);
          } else {
            await txDb.execute(`
              UPDATE object_types
              SET enabled = ?, updated_at = ?
              WHERE schema_id = ? AND jira_type_id = ?
            `, [update.enabled ? 1 : 0, now, schemaRow.id, objectTypeId]);
          }
        }
      }
    });

    logger.info(`SchemaConfiguration: Bulk updated ${updates.length} object types`);
  }

  /**
   * Get enabled object types (for sync engine)
   */
  async getEnabledObjectTypes(): Promise<Array<{
    schemaId: string;
    objectTypeId: number;
    objectTypeName: string;
    displayName: string;
  }>> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    // Use parameterized query to avoid boolean/integer comparison issues
    const rows = await db.query<{
      jira_schema_id: string;
      jira_type_id: number;
      type_name: string;
      display_name: string;
    }>(
      `SELECT s.jira_schema_id, ot.jira_type_id, ot.type_name, ot.display_name
       FROM object_types ot
       JOIN schemas s ON ot.schema_id = s.id
       WHERE ot.enabled = ?`,
      [db.isPostgres ? true : 1]
    );

    return rows.map((row: {
      jira_schema_id: string;
      jira_type_id: number;
      type_name: string;
      display_name: string;
    }) => ({
      schemaId: row.jira_schema_id,
      objectTypeId: row.jira_type_id,
      objectTypeName: row.type_name,
      displayName: row.display_name,
    }));
  }

  /**
   * Check if configuration is complete (at least one object type enabled)
   */
  async isConfigurationComplete(): Promise<boolean> {
    const enabledTypes = await this.getEnabledObjectTypes();
    return enabledTypes.length > 0;
  }

  /**
   * Get configuration statistics
   */
  async getConfigurationStats(): Promise<{
    totalSchemas: number;
    totalObjectTypes: number;
    enabledObjectTypes: number;
    disabledObjectTypes: number;
    isConfigured: boolean;
  }> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    const totalRow = await db.queryOne<{ count: number }>(`
      SELECT COUNT(*) as count FROM object_types
    `);

    // Use parameterized query to avoid boolean/integer comparison issues
    const enabledRow = await db.queryOne<{ count: number }>(
      `SELECT COUNT(*) as count FROM object_types WHERE enabled = ?`,
      [db.isPostgres ? true : 1]
    );

    const schemaRow = await db.queryOne<{ count: number }>(`
      SELECT COUNT(*) as count FROM schemas
    `);

    const total = totalRow?.count || 0;
    const enabled = enabledRow?.count || 0;
    const schemas = schemaRow?.count || 0;

    return {
      totalSchemas: schemas,
      totalObjectTypes: total,
      enabledObjectTypes: enabled,
      disabledObjectTypes: total - enabled,
      isConfigured: enabled > 0,
    };
  }

  /**
   * Get all schemas with their search enabled status
   */
  async getSchemas(): Promise<Array<{
    schemaId: string;
    schemaName: string;
    searchEnabled: boolean;
  }>> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    const rows = await db.query<{
      jira_schema_id: string;
      name: string;
      search_enabled: boolean | number;
    }>(`
      SELECT jira_schema_id, name, search_enabled
      FROM schemas
      ORDER BY name ASC
    `);

    return rows.map((row: {
      jira_schema_id: string;
      name: string;
      search_enabled: boolean | number;
    }) => ({
      schemaId: row.jira_schema_id,
      schemaName: row.name,
      searchEnabled: typeof row.search_enabled === 'boolean' ? row.search_enabled : row.search_enabled === 1,
    }));
  }

  /**
   * Set search enabled status for a schema
   */
  async setSchemaSearchEnabled(schemaId: string, searchEnabled: boolean): Promise<void> {
    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
    if (!db) {
      throw new Error('Database not available');
    }

    await (db as any).ensureInitialized?.();

    const now = new Date().toISOString();

    if (db.isPostgres) {
      await db.execute(`
        UPDATE schemas
        SET search_enabled = ?, updated_at = ?
        WHERE jira_schema_id = ?
      `, [searchEnabled, now, schemaId]);
    } else {
      await db.execute(`
        UPDATE schemas
        SET search_enabled = ?, updated_at = ?
        WHERE jira_schema_id = ?
      `, [searchEnabled ? 1 : 0, now, schemaId]);
    }

    logger.info(`SchemaConfiguration: Set schema ${schemaId} search_enabled=${searchEnabled}`);
  }
}

export const schemaConfigurationService = new SchemaConfigurationService();