import {
    afterNextRender,
    Component,
    computed,
    ElementRef,
    inject,
    Injector,
    input,
    OnInit,
    output,
    runInInjectionContext,
    signal,
    viewChild,
} from '@angular/core';
import { FormControl, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms';
import { MatError, MatFormField, MatInput, MatLabel } from '@angular/material/input';
import { MatButton } from '@angular/material/button';
import { EnterRecipeDataSubmitEvent } from './EnterRecipeDataSubmitEvent';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { faBars, faEllipsis } from '@fortawesome/free-solid-svg-icons';
import { MatMenu, MatMenuItem, MatMenuTrigger } from '@angular/material/menu';
import { MatDialog } from '@angular/material/dialog';
import { ImageUploadDialog } from './image-upload-dialog/image-upload-dialog';
import { IngredientDialog } from './ingredient-dialog/ingredient-dialog';
import { RecipeDraftViewModel } from '../../../../shared/models/RecipeDraftView.model';
import {
    MatCell,
    MatCellDef,
    MatColumnDef,
    MatHeaderCell,
    MatHeaderCellDef,
    MatHeaderRow,
    MatHeaderRowDef,
    MatRow,
    MatRowDef,
    MatTable,
} from '@angular/material/table';
import { IngredientDraftClientModel } from '../../../../shared/client-models/IngredientDraftClientModel';
import { CdkDrag, CdkDragDrop, CdkDropList, moveItemInArray } from '@angular/cdk/drag-drop';
import { DatePipe } from '@angular/common';
import { ImageSelect } from './image-select/image-select';
import { ImageView } from '../../../../shared/models/ImageView.model';

@Component({
    selector: 'app-enter-recipe-data',
    imports: [
        ReactiveFormsModule,
        MatFormField,
        MatLabel,
        MatInput,
        MatButton,
        FaIconComponent,
        MatMenuTrigger,
        MatMenu,
        MatMenuItem,
        MatTable,
        MatColumnDef,
        MatHeaderCell,
        MatHeaderCellDef,
        MatCell,
        MatCellDef,
        MatHeaderRow,
        MatHeaderRowDef,
        MatRow,
        MatRowDef,
        CdkDropList,
        CdkDrag,
        DatePipe,
        ImageSelect,
        MatError,
    ],
    templateUrl: './enter-recipe-data.html',
    styleUrl: './enter-recipe-data.css',
})
export class EnterRecipeData implements OnInit {
    public readonly draft = input.required<RecipeDraftViewModel>();
    public readonly submit = output<EnterRecipeDataSubmitEvent>();
    public readonly deleteDraft = output<void>();

    protected readonly recipeTextTextarea = viewChild.required<ElementRef<HTMLTextAreaElement>>('recipeTextTextarea');

    private readonly dialog = inject(MatDialog);

    protected readonly recipeFormGroup = new FormGroup({
        title: new FormControl('', Validators.required),
        slug: new FormControl('', Validators.required),
        preparationTime: new FormControl('', Validators.pattern(/^\d+$/)),
        cookingTime: new FormControl('', Validators.pattern(/^\d+$/)),
        totalTime: new FormControl('', Validators.pattern(/^\d+$/)),
        text: new FormControl('', Validators.required),
    });

    protected readonly ingredientsTable = viewChild<MatTable<unknown>>('ingredientsTable');
    protected readonly ingredientModels = signal<IngredientDraftClientModel[]>([]);

    private readonly mainImage = signal<ImageView | null>(null);
    protected readonly mainImageUsernameFilename = computed(() => {
        const mainImage = this.mainImage();
        if (mainImage) {
            return [mainImage.owner.username, mainImage.filename] as const;
        } else {
            return null;
        }
    });

    private readonly injector = inject(Injector);

    public ngOnInit(): void {
        const draft = this.draft();
        this.recipeFormGroup.patchValue({
            title: draft.title ?? '',
            slug: draft.slug ?? '',
            preparationTime: draft.preparationTime?.toString() ?? '',
            cookingTime: draft.cookingTime?.toString() ?? '',
            totalTime: draft.totalTime?.toString() ?? '',
            text: draft.rawText ?? '',
        });
        if (draft.ingredients) {
            this.ingredientModels.set(
                draft.ingredients.map((ingredient, index) => ({
                    id: index,
                    draft: ingredient,
                })),
            );
        }
        runInInjectionContext(this.injector, () => {
            afterNextRender({
                mixedReadWrite: () => {
                    this.updateTextareaHeight(this.recipeTextTextarea().nativeElement);
                },
            });
        });
    }

    private updateTextareaHeight(textarea: HTMLTextAreaElement) {
        const windowScrollX = window.scrollX;
        const windowScrollY = window.scrollY;
        textarea.style.height = 'auto';
        textarea.style.height = textarea.scrollHeight + 'px';
        requestAnimationFrame(() => {
            window.scrollTo(windowScrollX, windowScrollY);
        });
    }

    protected onRecipeTextChange(event: Event): void {
        this.updateTextareaHeight(event.target as HTMLTextAreaElement);
    }

    protected addIngredient() {
        const dialogRef = this.dialog.open<IngredientDialog, IngredientDraftClientModel, IngredientDraftClientModel>(
            IngredientDialog,
            {
                data: {
                    id: this.ingredientModels().length,
                    draft: {
                        name: '',
                    },
                },
            },
        );
        dialogRef.afterClosed().subscribe((ingredientModel) => {
            if (ingredientModel) {
                this.ingredientModels.update((ingredientModels) => [...ingredientModels, ingredientModel]);
                this.ingredientsTable()!.renderRows();
            }
        });
    }

    protected editIngredient(model: IngredientDraftClientModel): void {
        const dialogRef = this.dialog.open<IngredientDialog, IngredientDraftClientModel, IngredientDraftClientModel>(
            IngredientDialog,
            {
                data: model,
            },
        );
        dialogRef.afterClosed().subscribe((model) => {
            if (model) {
                this.ingredientModels.update((models) => {
                    const updated: IngredientDraftClientModel[] = [...models];
                    const target = updated.find((search) => search.id === model.id);
                    if (!target) {
                        throw new Error('Ingredient does not exist.');
                    }
                    target.draft = model.draft;
                    return updated;
                });
            }
        });
    }

    protected onIngredientDelete(ingredientModel: IngredientDraftClientModel) {
        this.ingredientModels.update((ingredientModels) => {
            const updated = ingredientModels.filter((model) => model.id !== ingredientModel.id);
            updated.sort((model0, model1) => model0.id - model1.id);
            updated.forEach((model, index) => {
                model.id = index;
            });
            return updated;
        });
    }

    protected onIngredientDrop(event: CdkDragDrop<IngredientDraftClientModel>): void {
        this.ingredientModels.update((ingredientModels) => {
            const modelIndex = ingredientModels.findIndex((m) => m.id === event.previousIndex);
            moveItemInArray(ingredientModels, modelIndex, event.currentIndex);
            ingredientModels.forEach((model, index) => {
                model.id = index;
            });
            return ingredientModels;
        });
        this.ingredientsTable()!.renderRows();
    }

    private getTime(s?: string | null): number | null {
        if (!s) return null;
        try {
            return parseInt(s);
        } catch (e) {
            console.error(`Should not have had a parse error because of form validators: ${e}`);
            return null;
        }
    }

    protected onSubmit(event: SubmitEvent): void {
        event.preventDefault();
        const value = this.recipeFormGroup.value;
        this.submit.emit({
            title: value.title!,
            slug: value.slug!,
            ingredients: this.ingredientModels().map((ingredientModel) => ingredientModel.draft),
            preparationTime: this.getTime(value.preparationTime),
            cookingTime: this.getTime(value.cookingTime),
            totalTime: this.getTime(value.totalTime),
            mainImage: this.mainImage(),
            rawText: value.text!,
        });
    }

    protected onDraftDelete(): void {
        this.deleteDraft.emit();
    }

    protected openImageUploadDialog(): void {
        this.dialog.open(ImageUploadDialog);
    }

    protected onMainImageSelect(imageView: ImageView | null): void {
        this.mainImage.set(imageView);
    }

    protected readonly faEllipsis = faEllipsis;
    protected readonly faBars = faBars;
}