import { Component, Inject, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormBuilder, FormGroup, Validators, ReactiveFormsModule, FormArray } from '@angular/forms';
import { MatDialogRef, MAT_DIALOG_DATA, MatDialogModule } from '@angular/material/dialog';
import { MatTabsModule } from '@angular/material/tabs';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatButtonModule } from '@angular/material/button';
import { MatIconModule } from '@angular/material/icon';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatDividerModule } from '@angular/material/divider';
import { MatExpansionModule } from '@angular/material/expansion';
import { MatChipsModule } from '@angular/material/chips';
import { ApiService } from '../../services/api.service';

@Component({
  selector: 'app-api-edit-dialog',
  standalone: true,
  imports: [
    CommonModule,
    ReactiveFormsModule,
    MatDialogModule,
    MatTabsModule,
    MatFormFieldModule,
    MatInputModule,
    MatSelectModule,
    MatCheckboxModule,
    MatButtonModule,
    MatIconModule,
    MatSnackBarModule,
    MatDividerModule,
    MatExpansionModule,
    MatChipsModule
  ],
  templateUrl: './api-edit-dialog.component.html',
  styleUrls: ['./api-edit-dialog.component.scss']
})
export default class ApiEditDialogComponent implements OnInit {
  form!: FormGroup;
  saving = false;
  testing = false;
  testResult: any = null;

  httpMethods = ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'];
  retryStrategies = ['static', 'exponential'];

  // Template variable helpers
  templateVariables = [
    { key: 'variables.origin', desc: 'Origin city from session' },
    { key: 'variables.destination', desc: 'Destination city from session' },
    { key: 'variables.flight_date', desc: 'Flight date from session' },
    { key: 'auth_tokens.api_name.token', desc: 'Auth token for this API' },
    { key: 'config.work_mode', desc: 'Current work mode' }
  ];

  constructor(
    private fb: FormBuilder,
    private apiService: ApiService,
    private snackBar: MatSnackBar,
    public dialogRef: MatDialogRef<ApiEditDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: any
  ) {}

  ngOnInit() {
    this.initializeForm();

    if (this.data.mode === 'edit' && this.data.api) {
      this.populateForm(this.data.api);
    } else if (this.data.mode === 'duplicate' && this.data.api) {
      const duplicateData = { ...this.data.api };
      duplicateData.name = duplicateData.name + '_copy';
      delete duplicateData.last_update_date;
      this.populateForm(duplicateData);
    }
  }

  initializeForm() {
    this.form = this.fb.group({
      // General Tab
      name: ['', [Validators.required, Validators.pattern(/^[a-zA-Z0-9_]+$/)]],
      url: ['', [Validators.required, Validators.pattern(/^https?:\/\/.+/)]],
      method: ['POST', Validators.required],
      body_template: ['{}'],
      timeout_seconds: [10, [Validators.required, Validators.min(1), Validators.max(300)]],
      response_prompt: [''],

      // Headers Tab
      headers: this.fb.array([]),

      // Retry Settings
      retry: this.fb.group({
        retry_count: [3, [Validators.required, Validators.min(0), Validators.max(10)]],
        backoff_seconds: [2, [Validators.required, Validators.min(1), Validators.max(60)]],
        strategy: ['static', Validators.required]
      }),

      // Auth Tab
      auth: this.fb.group({
        enabled: [false],
        token_endpoint: [''],
        response_token_path: ['token'],
        token_request_body: ['{}'],
        token_refresh_endpoint: [''],
        token_refresh_body: ['{}']
      }),

      // Proxy (optional)
      proxy: [''],

      // For race condition handling
      last_update_date: ['']
    });

    // Watch for auth enabled changes
    this.form.get('auth.enabled')?.valueChanges.subscribe(enabled => {
      const authGroup = this.form.get('auth');
      if (enabled) {
        authGroup?.get('token_endpoint')?.setValidators([Validators.required]);
        authGroup?.get('response_token_path')?.setValidators([Validators.required]);
      } else {
        authGroup?.get('token_endpoint')?.clearValidators();
        authGroup?.get('response_token_path')?.clearValidators();
      }
      authGroup?.get('token_endpoint')?.updateValueAndValidity();
      authGroup?.get('response_token_path')?.updateValueAndValidity();
    });
  }

  populateForm(api: any) {
    // Convert headers object to FormArray
    const headersArray = this.form.get('headers') as FormArray;
    headersArray.clear();

    if (api.headers && typeof api.headers === 'object') {
      Object.entries(api.headers).forEach(([key, value]) => {
        headersArray.push(this.createHeaderFormGroup(key, value as string));
      });
    }

    // Convert body_template to JSON string if it's an object
    if (api.body_template && typeof api.body_template === 'object') {
      api.body_template = JSON.stringify(api.body_template, null, 2);
    }

    // Convert auth bodies to JSON strings
    if (api.auth) {
      if (api.auth.token_request_body && typeof api.auth.token_request_body === 'object') {
        api.auth.token_request_body = JSON.stringify(api.auth.token_request_body, null, 2);
      }
      if (api.auth.token_refresh_body && typeof api.auth.token_refresh_body === 'object') {
        api.auth.token_refresh_body = JSON.stringify(api.auth.token_refresh_body, null, 2);
      }
    }

    // Patch form values
    this.form.patchValue(api);

    // Disable name field if editing
    if (this.data.mode === 'edit') {
      this.form.get('name')?.disable();
    }
  }

  get headers() {
    return this.form.get('headers') as FormArray;
  }

  createHeaderFormGroup(key = '', value = ''): FormGroup {
    return this.fb.group({
      key: [key, Validators.required],
      value: [value, Validators.required]
    });
  }

  addHeader() {
    this.headers.push(this.createHeaderFormGroup());
  }

  removeHeader(index: number) {
    this.headers.removeAt(index);
  }

  insertTemplateVariable(field: string, variable: string) {
    const control = field.includes('.') 
      ? this.form.get(field)
      : this.form.get(field);
    
    if (control) {
      const currentValue = control.value || '';
      const newValue = currentValue + `{{${variable}}}`;
      control.setValue(newValue);
    }
  }

  validateJSON(field: string): boolean {
    const control = this.form.get(field);
    if (!control || !control.value) return true;

    try {
      JSON.parse(control.value);
      return true;
    } catch {
      return false;
    }
  }

  async testAPI() {
    // Validate form first
    const generalValid = this.form.get('url')?.valid && this.form.get('method')?.valid;
    if (!generalValid) {
      this.snackBar.open('Please fill in required fields first', 'Close', { duration: 3000 });
      return;
    }

    this.testing = true;
    this.testResult = null;

    try {
      const testData = this.prepareAPIData();
      
      // For test, we'll use a sample request
      const result = await this.apiService.testAPI(testData).toPromise();
      this.testResult = result;

      if (result.success) {
        this.snackBar.open('API test successful!', 'Close', { duration: 3000 });
      } else {
        this.snackBar.open(`API test failed: ${result.error}`, 'Close', { 
          duration: 5000,
          panelClass: 'error-snackbar' 
        });
      }
    } catch (error: any) {
      this.testResult = {
        success: false,
        error: error.message || 'Test failed'
      };
      this.snackBar.open('API test failed', 'Close', { 
        duration: 3000,
        panelClass: 'error-snackbar' 
      });
    } finally {
      this.testing = false;
    }
  }

  prepareAPIData(): any {
    const formValue = this.form.getRawValue();

    // Convert headers array back to object
    const headers: any = {};
    formValue.headers.forEach((h: any) => {
      if (h.key && h.value) {
        headers[h.key] = h.value;
      }
    });

    // Parse JSON fields
    let body_template = {};
    let auth_token_request_body = {};
    let auth_token_refresh_body = {};

    try {
      body_template = formValue.body_template ? JSON.parse(formValue.body_template) : {};
    } catch (e) {
      console.error('Invalid body_template JSON:', e);
    }

    try {
      auth_token_request_body = formValue.auth.token_request_body ? JSON.parse(formValue.auth.token_request_body) : {};
    } catch (e) {
      console.error('Invalid auth token_request_body JSON:', e);
    }

    try {
      auth_token_refresh_body = formValue.auth.token_refresh_body ? JSON.parse(formValue.auth.token_refresh_body) : {};
    } catch (e) {
      console.error('Invalid auth token_refresh_body JSON:', e);
    }

    // Prepare final data
    const apiData: any = {
      name: formValue.name,
      url: formValue.url,
      method: formValue.method,
      headers,  // Now it's a dictionary object
      body_template,
      timeout_seconds: formValue.timeout_seconds,
      retry: formValue.retry,
      response_prompt: formValue.response_prompt
    };

    // Add proxy if specified
    if (formValue.proxy) {
      apiData.proxy = formValue.proxy;
    }

    // Add auth if enabled
    if (formValue.auth.enabled) {
      apiData.auth = {
        enabled: true,
        token_endpoint: formValue.auth.token_endpoint,
        response_token_path: formValue.auth.response_token_path,
        token_request_body: auth_token_request_body
      };

      if (formValue.auth.token_refresh_endpoint) {
        apiData.auth.token_refresh_endpoint = formValue.auth.token_refresh_endpoint;
        apiData.auth.token_refresh_body = auth_token_refresh_body;
      }
    }

    // Add last_update_date for edit mode
    if (this.data.mode === 'edit' && formValue.last_update_date) {
      apiData.last_update_date = formValue.last_update_date;
    }

    return apiData;
  }

  async save() {
    if (this.form.invalid) {
      // Mark all fields as touched to show validation errors
      Object.keys(this.form.controls).forEach(key => {
        this.form.get(key)?.markAsTouched();
      });
      
      // Check specific JSON fields
      const jsonFields = ['body_template', 'auth.token_request_body', 'auth.token_refresh_body'];
      for (const field of jsonFields) {
        if (!this.validateJSON(field)) {
          this.snackBar.open(`Invalid JSON in ${field}`, 'Close', { 
            duration: 3000,
            panelClass: 'error-snackbar' 
          });
          return;
        }
      }

      this.snackBar.open('Please fix validation errors', 'Close', { duration: 3000 });
      return;
    }

    this.saving = true;
    try {
      const apiData = this.prepareAPIData();

      if (this.data.mode === 'create' || this.data.mode === 'duplicate') {
        await this.apiService.createAPI(apiData).toPromise();
        this.snackBar.open('API created successfully', 'Close', { duration: 3000 });
      } else {
        await this.apiService.updateAPI(this.data.api.name, apiData).toPromise();
        this.snackBar.open('API updated successfully', 'Close', { duration: 3000 });
      }

      this.dialogRef.close(true);
    } catch (error: any) {
      const message = error.error?.detail || 
        (this.data.mode === 'create' ? 'Failed to create API' : 'Failed to update API');
      this.snackBar.open(message, 'Close', { 
        duration: 5000, 
        panelClass: 'error-snackbar' 
      });
    } finally {
      this.saving = false;
    }
  }

  cancel() {
    this.dialogRef.close(false);
  }
}