import { Component, inject, OnInit, OnDestroy } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { MatDialog, MatDialogModule } from '@angular/material/dialog';
import { MatTableModule } from '@angular/material/table';
import { MatButtonModule } from '@angular/material/button';
import { MatIconModule } from '@angular/material/icon';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatProgressBarModule } from '@angular/material/progress-bar';
import { MatChipsModule } from '@angular/material/chips';
import { MatMenuModule } from '@angular/material/menu';
import { MatTooltipModule } from '@angular/material/tooltip';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatDividerModule } from '@angular/material/divider'; 
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { ApiService, API } from '../../services/api.service';
import { Subject, takeUntil } from 'rxjs';

@Component({
  selector: 'app-apis',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    MatDialogModule,
    MatTableModule,
    MatButtonModule,
    MatIconModule,
    MatFormFieldModule,
    MatInputModule,
    MatCheckboxModule,
    MatProgressBarModule,
    MatChipsModule,
    MatMenuModule,
    MatTooltipModule,
    MatSnackBarModule,
    MatDividerModule,
    MatProgressSpinnerModule
  ],
  template: `
    <div class="apis-container">
      <div class="toolbar">
        <h2>API Definitions</h2>
        <div class="toolbar-actions">
          <button mat-raised-button color="primary" (click)="createAPI()" [disabled]="loading">
            <mat-icon>add</mat-icon>
            New API
          </button>
          <button mat-button (click)="importAPIs()" [disabled]="loading">
            <mat-icon>upload</mat-icon>
            Import
          </button>
          <button mat-button (click)="exportAPIs()" [disabled]="loading || filteredAPIs.length === 0">
            <mat-icon>download</mat-icon>
            Export
          </button>
          <mat-form-field appearance="outline" class="search-field">
            <mat-label>Search APIs</mat-label>
            <input matInput [(ngModel)]="searchTerm" (input)="filterAPIs()">
            <mat-icon matSuffix>search</mat-icon>
          </mat-form-field>
          <mat-checkbox [(ngModel)]="showDeleted" (change)="loadAPIs()">
            Display Deleted
          </mat-checkbox>
        </div>
      </div>

      <mat-progress-bar mode="indeterminate" *ngIf="loading"></mat-progress-bar>

      @if (!loading && error) {
        <div class="error-state">
          <mat-icon>error_outline</mat-icon>
          <p>{{ error }}</p>
          <button mat-raised-button color="primary" (click)="loadAPIs()">
            <mat-icon>refresh</mat-icon>
            Retry
          </button>
        </div>
      } @else if (!loading && filteredAPIs.length === 0 && !searchTerm) {
        <div class="empty-state">
          <mat-icon>api</mat-icon>
          <p>No APIs found.</p>
          <button mat-raised-button color="primary" (click)="createAPI()">
            Create your first API
          </button>
        </div>
      } @else if (!loading && filteredAPIs.length === 0 && searchTerm) {
        <div class="empty-state">
          <mat-icon>search_off</mat-icon>
          <p>No APIs match your search.</p>
          <button mat-button (click)="searchTerm = ''; filterAPIs()">
            Clear search
          </button>
        </div>
      } @else if (!loading) {
        <table mat-table [dataSource]="filteredAPIs" class="apis-table">
          <!-- Name Column -->
          <ng-container matColumnDef="name">
            <th mat-header-cell *matHeaderCellDef>Name</th>
            <td mat-cell *matCellDef="let api">{{ api.name }}</td>
          </ng-container>

          <!-- URL Column -->
          <ng-container matColumnDef="url">
            <th mat-header-cell *matHeaderCellDef>URL</th>
            <td mat-cell *matCellDef="let api" class="url-cell">
              <span [matTooltip]="api.url">{{ api.url }}</span>
            </td>
          </ng-container>

          <!-- Method Column -->
          <ng-container matColumnDef="method">
            <th mat-header-cell *matHeaderCellDef>Method</th>
            <td mat-cell *matCellDef="let api">
              <mat-chip [class]="'method-' + api.method.toLowerCase()">
                {{ api.method }}
              </mat-chip>
            </td>
          </ng-container>

          <!-- Timeout Column -->
          <ng-container matColumnDef="timeout">
            <th mat-header-cell *matHeaderCellDef>Timeout</th>
            <td mat-cell *matCellDef="let api">{{ api.timeout_seconds }}s</td>
          </ng-container>

          <!-- Auth Column -->
          <ng-container matColumnDef="auth">
            <th mat-header-cell *matHeaderCellDef>Auth</th>
            <td mat-cell *matCellDef="let api">
              <mat-icon [color]="api.auth?.enabled ? 'primary' : ''" 
                        [matTooltip]="api.auth?.enabled ? 'Authentication enabled' : 'No authentication'">
                {{ api.auth?.enabled ? 'lock' : 'lock_open' }}
              </mat-icon>
            </td>
          </ng-container>

          <!-- Deleted Column -->
          <ng-container matColumnDef="deleted">
            <th mat-header-cell *matHeaderCellDef>Status</th>
            <td mat-cell *matCellDef="let api">
              @if (api.deleted) {
                <mat-icon color="warn" matTooltip="Deleted">delete</mat-icon>
              } @else {
                <mat-icon color="primary" matTooltip="Active">check_circle</mat-icon>
              }
            </td>
          </ng-container>

          <!-- Actions Column -->
          <ng-container matColumnDef="actions">
            <th mat-header-cell *matHeaderCellDef>Actions</th>
            <td mat-cell *matCellDef="let api">
              <button mat-icon-button [matMenuTriggerFor]="menu" 
                      (click)="$event.stopPropagation()"
                      [disabled]="actionLoading[api.name]">
                @if (actionLoading[api.name]) {
                  <mat-spinner diameter="20"></mat-spinner>
                } @else {
                  <mat-icon>more_vert</mat-icon>
                }
              </button>
              <mat-menu #menu="matMenu">
                <button mat-menu-item (click)="editAPI(api)" [disabled]="api.deleted">
                  <mat-icon>edit</mat-icon>
                  <span>Edit</span>
                </button>
                <button mat-menu-item (click)="testAPI(api)">
                  <mat-icon>play_arrow</mat-icon>
                  <span>Test</span>
                </button>
                <button mat-menu-item (click)="duplicateAPI(api)">
                  <mat-icon>content_copy</mat-icon>
                  <span>Duplicate</span>
                </button>
                @if (!api.deleted) {
                  <mat-divider></mat-divider>
                  <button mat-menu-item (click)="deleteAPI(api)">
                    <mat-icon color="warn">delete</mat-icon>
                    <span>Delete</span>
                  </button>
                } @else {
                  <mat-divider></mat-divider>
                  <button mat-menu-item (click)="restoreAPI(api)">
                    <mat-icon color="primary">restore</mat-icon>
                    <span>Restore</span>
                  </button>
                }
              </mat-menu>
            </td>
          </ng-container>

          <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
          <tr mat-row *matRowDef="let row; columns: displayedColumns;"
              [class.deleted-row]="row.deleted"
              (click)="editAPI(row)"></tr>
        </table>
      }
    </div>
  `,
  styles: [`
    .apis-container {
      .toolbar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 24px;
        flex-wrap: wrap;
        gap: 16px;

        h2 {
          margin: 0;
          font-size: 24px;
        }

        .toolbar-actions {
          display: flex;
          gap: 16px;
          align-items: center;
          flex-wrap: wrap;

          .search-field {
            width: 250px;
          }
        }
      }

      .empty-state, .error-state {
        text-align: center;
        padding: 60px 20px;
        background-color: white;
        border-radius: 8px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);

        mat-icon {
          font-size: 64px;
          width: 64px;
          height: 64px;
          color: #e0e0e0;
          margin-bottom: 16px;
        }

        p {
          margin-bottom: 24px;
          color: #666;
          font-size: 16px;
        }
      }

      .error-state {
        mat-icon {
          color: #f44336;
        }
      }

      .apis-table {
        width: 100%;
        background: white;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);

        .url-cell {
          max-width: 300px;
          
          span {
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            display: block;
          }
        }

        mat-chip {
          font-size: 12px;
          min-height: 24px;
          padding: 4px 12px;

          &.method-get { background-color: #4caf50; color: white; }
          &.method-post { background-color: #2196f3; color: white; }
          &.method-put { background-color: #ff9800; color: white; }
          &.method-patch { background-color: #9c27b0; color: white; }
          &.method-delete { background-color: #f44336; color: white; }
        }

        tr.mat-mdc-row {
          cursor: pointer;
          transition: background-color 0.2s;

          &:hover {
            background-color: #f5f5f5;
          }

          &.deleted-row {
            opacity: 0.6;
            background-color: #fafafa;
            cursor: default;
          }
        }

        mat-spinner {
          display: inline-block;
        }
      }
    }

    ::ng-deep {
      .mat-mdc-form-field {
        font-size: 14px;
      }

      .mat-mdc-checkbox {
        .mdc-form-field {
          font-size: 14px;
        }
      }
    }
  `]
})
export class ApisComponent implements OnInit, OnDestroy {
  private apiService = inject(ApiService);
  private dialog = inject(MatDialog);
  private snackBar = inject(MatSnackBar);
  private destroyed$ = new Subject<void>();

  apis: API[] = [];
  filteredAPIs: API[] = [];
  loading = true;
  error = '';
  showDeleted = false;
  searchTerm = '';
  actionLoading: { [key: string]: boolean } = {};
  
  displayedColumns: string[] = ['name', 'url', 'method', 'timeout', 'auth', 'deleted', 'actions'];

  ngOnInit() {
    this.loadAPIs();
  }

  ngOnDestroy() {
    this.destroyed$.next();
    this.destroyed$.complete();
  }

  loadAPIs() {
    this.loading = true;
    this.error = '';
    
    this.apiService.getAPIs(this.showDeleted).pipe(
      takeUntil(this.destroyed$)
    ).subscribe({
      next: (apis) => {
        this.apis = apis;
        this.filterAPIs();
        this.loading = false;
      },
      error: (err) => {
        this.error = this.getErrorMessage(err);
        this.snackBar.open(this.error, 'Close', {
          duration: 5000,
          panelClass: 'error-snackbar'
        });
        this.loading = false;
      }
    });
  }

  filterAPIs() {
    const term = this.searchTerm.toLowerCase().trim();
    if (!term) {
      this.filteredAPIs = [...this.apis];
    } else {
      this.filteredAPIs = this.apis.filter(api =>
        api.name.toLowerCase().includes(term) ||
        api.url.toLowerCase().includes(term) ||
        api.method.toLowerCase().includes(term)
      );
    }
  }

  async createAPI() {
    try {
      const { default: ApiEditDialogComponent } = await import('../../dialogs/api-edit-dialog/api-edit-dialog.component');
      
      const dialogRef = this.dialog.open(ApiEditDialogComponent, {
        width: '800px',
        data: { mode: 'create' },
        disableClose: true
      });

      dialogRef.afterClosed().pipe(
        takeUntil(this.destroyed$)
      ).subscribe((result: any) => {
        if (result) {
          this.loadAPIs();
        }
      });
    } catch (error) {
      console.error('Failed to load dialog:', error);
      this.snackBar.open('Failed to open dialog', 'Close', {
        duration: 3000,
        panelClass: 'error-snackbar'
      });
    }
  }

  async editAPI(api: API) {
    if (api.deleted) return;
    
    try {
      const { default: ApiEditDialogComponent } = await import('../../dialogs/api-edit-dialog/api-edit-dialog.component');
      
      const dialogRef = this.dialog.open(ApiEditDialogComponent, {
        width: '800px',
        data: { mode: 'edit', api: { ...api } },
        disableClose: true
      });

      dialogRef.afterClosed().pipe(
        takeUntil(this.destroyed$)
      ).subscribe((result: any) => {
        if (result) {
          this.loadAPIs();
        }
      });
    } catch (error) {
      console.error('Failed to load dialog:', error);
      this.snackBar.open('Failed to open dialog', 'Close', {
        duration: 3000,
        panelClass: 'error-snackbar'
      });
    }
  }

  async testAPI(api: API) {
    try {
      const { default: ApiEditDialogComponent } = await import('../../dialogs/api-edit-dialog/api-edit-dialog.component');
      
      const dialogRef = this.dialog.open(ApiEditDialogComponent, {
        width: '800px',
        data: { 
          mode: 'test',
          api: { ...api },
          activeTab: 4
        },
        disableClose: false
      });
  
      dialogRef.afterClosed().pipe(
        takeUntil(this.destroyed$)
      ).subscribe((result: any) => {
        if (result) {
          this.loadAPIs();
        }
      });
    } catch (error) {
      console.error('Failed to load dialog:', error);
      this.snackBar.open('Failed to open dialog', 'Close', {
        duration: 3000,
        panelClass: 'error-snackbar'
      });
    }
  }

  async duplicateAPI(api: API) {
    try {
      const { default: ApiEditDialogComponent } = await import('../../dialogs/api-edit-dialog/api-edit-dialog.component');
      
      const duplicatedApi = { ...api };
      duplicatedApi.name = `${api.name}_copy`;
      delete (duplicatedApi as any).last_update_date;
      
      const dialogRef = this.dialog.open(ApiEditDialogComponent, {
        width: '800px',
        data: { mode: 'duplicate', api: duplicatedApi },
        disableClose: true
      });

      dialogRef.afterClosed().pipe(
        takeUntil(this.destroyed$)
      ).subscribe((result: any) => {
        if (result) {
          this.loadAPIs();
        }
      });
    } catch (error) {
      console.error('Failed to load dialog:', error);
      this.snackBar.open('Failed to open dialog', 'Close', {
        duration: 3000,
        panelClass: 'error-snackbar'
      });
    }
  }

  async deleteAPI(api: API) {
    if (api.deleted) return;
    
    try {
      const { default: ConfirmDialogComponent } = await import('../../dialogs/confirm-dialog/confirm-dialog.component');
      
      const dialogRef = this.dialog.open(ConfirmDialogComponent, {
        width: '400px',
        data: {
          title: 'Delete API',
          message: `Are you sure you want to delete "${api.name}"?`,
          confirmText: 'Delete',
          confirmColor: 'warn'
        }
      });

      dialogRef.afterClosed().pipe(
        takeUntil(this.destroyed$)
      ).subscribe((confirmed) => {
        if (confirmed) {
          this.actionLoading[api.name] = true;
          
          this.apiService.deleteAPI(api.name).pipe(
            takeUntil(this.destroyed$)
          ).subscribe({
            next: () => {
              this.snackBar.open(`API "${api.name}" deleted successfully`, 'Close', {
                duration: 3000
              });
              this.loadAPIs();
            },
            error: (err) => {
              const errorMsg = this.getErrorMessage(err);
              this.snackBar.open(errorMsg, 'Close', {
                duration: 5000,
                panelClass: 'error-snackbar'
              });
              this.actionLoading[api.name] = false;
            }
          });
        }
      });
    } catch (error) {
      console.error('Failed to load dialog:', error);
      this.snackBar.open('Failed to open dialog', 'Close', {
        duration: 3000,
        panelClass: 'error-snackbar'
      });
    }
  }

  async restoreAPI(api: API) {
    if (!api.deleted) return;
    
    // Implement restore API functionality
    this.snackBar.open('Restore functionality not implemented yet', 'Close', {
      duration: 3000
    });
  }

  async importAPIs() {
    const input = document.createElement('input');
    input.type = 'file';
    input.accept = '.json';
  
    input.onchange = async (event: any) => {
      const file = event.target.files[0];
      if (!file) return;
  
      try {
        const text = await file.text();
        let apis: any[];
        
        try {
          apis = JSON.parse(text);
        } catch (parseError) {
          this.snackBar.open('Invalid JSON file format', 'Close', {
            duration: 5000,
            panelClass: 'error-snackbar'
          });
          return;
        }
  
        if (!Array.isArray(apis)) {
          this.snackBar.open('Invalid file format. Expected an array of APIs.', 'Close', {
            duration: 5000,
            panelClass: 'error-snackbar'
          });
          return;
        }
  
        this.loading = true;
        let imported = 0;
        let failed = 0;
        const errors: string[] = [];
  
        console.log('Starting API import, total APIs:', apis.length);
        
        for (const api of apis) {
          try {
            await this.apiService.createAPI(api).toPromise();
            imported++;
          } catch (err: any) {
            failed++;
            const apiName = api.name || 'unnamed';
  
            console.error(`❌ Failed to import API ${apiName}:`, err);
            
            // Parse error message - daha iyi hata mesajı parse etme
            let errorMsg = 'Unknown error';
            
            if (err.status === 409) {
              // DuplicateResourceError durumu
              errorMsg = `API with name '${apiName}' already exists`;
            } else if (err.status === 500 && err.error?.detail?.includes('already exists')) {
              // Backend'den gelen duplicate hatası
              errorMsg = `API with name '${apiName}' already exists`;
            } else if (err.error?.message) {
              errorMsg = err.error.message;
            } else if (err.error?.detail) {
              errorMsg = err.error.detail;
            } else if (err.message) {
              errorMsg = err.message;
            }
            
            errors.push(`${apiName}: ${errorMsg}`);
          }
        }
  
        this.loading = false;
        
        if (imported > 0) {
          this.loadAPIs();
        }
  
        // Always show dialog for import results
        try {
          await this.showImportResultsDialog(imported, failed, errors);
        } catch (dialogError) {
          console.error('Failed to show import dialog:', dialogError);
          // Fallback to snackbar
          this.showImportResultsSnackbar(imported, failed, errors);
        }        
  
      } catch (error) {
        this.loading = false;
        this.snackBar.open('Failed to read file', 'Close', {
          duration: 5000,
          panelClass: 'error-snackbar'
        });
      }
    };
  
    input.click();
  }
  
  private async showImportResultsDialog(imported: number, failed: number, errors: string[]) {
    try {
      const { default: ImportResultsDialogComponent } = await import('../../dialogs/import-results-dialog/import-results-dialog.component');
      
      this.dialog.open(ImportResultsDialogComponent, {
        width: '600px',
        data: {
          title: 'API Import Results',
          imported,
          failed,
          errors
        }
      });
    } catch (error) {
      // Fallback to alert if dialog fails to load
      alert(`Imported: ${imported}\nFailed: ${failed}\n\nErrors:\n${errors.join('\n')}`);
    }
  }

  // Fallback method
  private showImportResultsSnackbar(imported: number, failed: number, errors: string[]) {
    let message = '';
    if (imported > 0) {
      message = `Successfully imported ${imported} API${imported > 1 ? 's' : ''}.`;
    }
    
    if (failed > 0) {
      if (message) message += '\n\n';
      message += `Failed to import ${failed} API${failed > 1 ? 's' : ''}:\n`;
      message += errors.slice(0, 5).join('\n');
      if (errors.length > 5) {
        message += `\n... and ${errors.length - 5} more errors`;
      }
    }
  
    this.snackBar.open(message, 'Close', {
      duration: 10000,
      panelClass: ['multiline-snackbar', failed > 0 ? 'error-snackbar' : 'success-snackbar'],
      verticalPosition: 'top',
      horizontalPosition: 'right'
    });
  }
  
  exportAPIs() {
    const selectedAPIs = this.filteredAPIs.filter(api => !api.deleted);
    
    if (selectedAPIs.length === 0) {
      this.snackBar.open('No APIs to export', 'Close', {
        duration: 3000
      });
      return;
    }

    try {
      const data = JSON.stringify(selectedAPIs, null, 2);
      const blob = new Blob([data], { type: 'application/json' });
      const url = window.URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = url;
      link.download = `apis_export_${new Date().getTime()}.json`;
      link.click();
      window.URL.revokeObjectURL(url);

      this.snackBar.open(`Exported ${selectedAPIs.length} APIs`, 'Close', {
        duration: 3000
      });
    } catch (error) {
      console.error('Export failed:', error);
      this.snackBar.open('Failed to export APIs', 'Close', {
        duration: 5000,
        panelClass: 'error-snackbar'
      });
    }
  }

  private getErrorMessage(error: any): string {
    if (error.status === 0) {
      return 'Unable to connect to server. Please check your connection.';
    } else if (error.status === 401) {
      return 'Session expired. Please login again.';
    } else if (error.status === 403) {
      return 'You do not have permission to perform this action.';
    } else if (error.status === 409) {
      return 'This API was modified by another user. Please refresh and try again.';
    } else if (error.error?.detail) {
      return error.error.detail;
    } else if (error.message) {
      return error.message;
    }
    return 'An unexpected error occurred. Please try again.';
  }
}