import { ChangeDetectionStrategy, Component, computed, inject, signal } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { RouterLink } from '@angular/router';
import { Api } from '../../core/api';
import { errorMessage } from '../../core/format';
import type {
  AuditStatus,
  CreateProjectInput,
  ProjectOptions,
  ProjectType,
} from '../../core/models';
import { Icon } from '../../shared/icon';
import { JobConsole } from '../../shared/job-console';

const TYPES: { value: ProjectType; label: string; description: string }[] = [
  {
    value: 'node',
    label: 'Node.js',
    description: 'Une app Node lancée par une commande (node start.js…).',
  },
  {
    value: 'adonis',
    label: 'AdonisJS',
    description: 'Compilée (node ace build) puis lancée en production.',
  },
  { value: 'wordpress', label: 'WordPress', description: 'Image officielle, base MariaDB dédiée.' },
  {
    value: 'static',
    label: 'Site statique',
    description: 'Fichiers servis directement par Caddy.',
  },
];

const NAME_PATTERN = /^[a-z0-9][a-z0-9-]{0,40}$/;

@Component({
  selector: 'app-project-new',
  imports: [FormsModule, RouterLink, Icon, JobConsole],
  templateUrl: './project-new.html',
  styleUrl: './project-new.scss',
  changeDetection: ChangeDetectionStrategy.OnPush,
})
export class ProjectNewPage {
  private api = inject(Api);

  protected readonly types = TYPES;
  protected readonly options = signal<ProjectOptions | null>(null);

  protected readonly type = signal<ProjectType>('node');
  protected readonly name = signal('');
  protected readonly category = signal('api');
  protected readonly gitUrl = signal('');
  protected readonly port = signal(3333);
  protected readonly command = signal('');
  protected readonly env = signal('');
  protected readonly createDatabase = signal(false);
  protected readonly addCaddy = signal(true);
  protected readonly spa = signal(true);
  /**
   * Null while the domain follows the name.
   */
  protected readonly customDomain = signal<string | null>(null);

  protected readonly submitting = signal(false);
  protected readonly error = signal<string | null>(null);
  protected readonly jobId = signal<number | null>(null);
  protected readonly jobStatus = signal<AuditStatus | null>(null);

  protected readonly domain = computed(
    () =>
      this.customDomain() ??
      (this.name() ? `${this.name()}.${this.options()?.baseDomain ?? ''}` : ''),
  );

  protected readonly isApp = computed(() => this.type() === 'node' || this.type() === 'adonis');
  protected readonly nameValid = computed(() => NAME_PATTERN.test(this.name()));

  protected readonly targetPath = computed(() => {
    const root = this.options()?.srvRoot ?? '/srv';
    const folder =
      this.type() === 'static'
        ? 'html'
        : this.type() === 'wordpress'
          ? 'wordpress'
          : this.category();
    return `${root}/${folder}/${this.name() || '<nom>'}`.replace(/\\/g, '/');
  });

  /**
   * What the creation will do, step by step.
   */
  protected readonly steps = computed(() => {
    const steps: string[] = [`Créer le dossier ${this.targetPath()}`];
    const type = this.type();
    if (type === 'static') {
      steps.push('Y mettre une page d’attente (à remplacer par ton build)');
    } else {
      if (this.isApp()) steps.push('Cloner le dépôt dans project/');
      if (type === 'wordpress' || this.createDatabase()) {
        steps.push(
          `Créer la base MariaDB « ${(this.name() || '<nom>').replace(/-/g, '_')} » et son utilisateur`,
        );
      }
      steps.push(
        type === 'wordpress' ? 'Écrire le .env (identifiants de la base)' : 'Écrire project/.env',
      );
      steps.push('Écrire le docker-compose.yml (template de la procédure)');
      steps.push('Lancer : docker compose up -d');
    }
    if (this.addCaddy())
      steps.push(`Ajouter ${this.domain() || '<domaine>'} au Caddyfile et recharger Caddy`);
    return steps;
  });

  constructor() {
    this.api
      .projectOptions()
      .then((options) => {
        this.options.set(options);
        this.command.set(options.defaultNodeCommand);
      })
      .catch((error) => this.error.set(errorMessage(error)));
  }

  protected selectType(type: ProjectType) {
    this.type.set(type);
    if (type === 'wordpress') this.category.set('wordpress');
    else if (this.category() === 'wordpress') this.category.set('api');
  }

  protected async submit() {
    this.error.set(null);
    if (!this.nameValid()) {
      this.error.set('Le nom ne peut contenir que des minuscules, des chiffres et des tirets.');
      return;
    }
    if (this.isApp() && !this.gitUrl().trim()) {
      this.error.set('L’URL du dépôt git est obligatoire.');
      return;
    }

    const type = this.type();
    const input: CreateProjectInput = {
      type,
      name: this.name(),
      category: type === 'wordpress' ? 'wordpress' : this.category(),
      createDatabase: type === 'wordpress' || (this.isApp() && this.createDatabase()),
      domain: this.domain(),
      addCaddy: this.addCaddy(),
      spa: this.spa(),
    };
    if (this.isApp()) {
      input.gitUrl = this.gitUrl().trim();
      input.port = Number(this.port());
      input.env = this.env();
      if (type === 'node') input.command = this.command().trim();
    }

    this.submitting.set(true);
    try {
      const { jobId } = await this.api.createProject(input);
      this.jobStatus.set(null);
      this.jobId.set(jobId);
    } catch (error) {
      this.error.set(errorMessage(error));
    } finally {
      this.submitting.set(false);
    }
  }

  protected projectLink() {
    const type = this.type();
    const category =
      type === 'static' ? 'html' : type === 'wordpress' ? 'wordpress' : this.category();
    return ['/projects', category, this.name()];
  }
}