import { Injectable, inject, isDevMode } from '@angular/core';
import { Result, ok, err } from '@shared/kernel/fp';
import { runResult, runSubmit } from '@shared/application/submit';
import { currentRole } from '@shared/infrastructure/role';
import { problemDetail } from '@shared/infrastructure/api-error';
import { environment } from '@shared/environments/environment';
import {
  ApiClient,
  OrgTemplateAdminViewDto,
  OrgTemplateDto,
  OrgTemplateVersionDto,
  PublishOrgTemplateResponse,
  SubOrgSummaryDto,
} from '@shared/infrastructure/api-client';
import {
  OrgTemplate,
  OrgTemplateAdminView,
  OrgTemplateVersion,
  PublishResult,
  SubOrgSummary,
} from '@brief/domain/org-template';
import { parseOrgTemplate } from '@brief/infrastructure/brief.adapter';

/**
 * The only place admin org-template HTTP lives (ADR-0001 boundary). CRUD/publish/
 * rollback go through the generated client (X-Role added by `roleInterceptor`);
 * `parse*` narrows the untrusted wire shape. The proefbrief is `text/html` and
 * `ExcludeFromDescription`'d — a hand-written fetch, same seam as `letter-preview.adapter`.
 * `X-Role` there is a dev-only identity stand-in (`role.ts`) and is sent only under
 * `isDevMode()`, mirroring `roleInterceptor`'s own dev-only registration — a production
 * build never sends it from this hand-written call either (BIO-012).
 */

const FAILED = $localize`:@@orgTemplate.action.failed:De actie is niet gelukt. Probeer het later opnieuw.`;
export const PROEFBRIEF_FAILED = $localize`:@@orgTemplate.proefbrief.failed:De proefbrief kon niet worden geopend.`;

@Injectable({ providedIn: 'root' })
export class OrgTemplateAdapter {
  private client = inject(ApiClient);

  async list(): Promise<Result<string, SubOrgSummary[]>> {
    const r = await runResult(() => this.client.orgTemplates(), FAILED);
    if (!r.ok) return r;
    const out: SubOrgSummary[] = [];
    for (const s of r.value ?? []) {
      const parsed = parseSubOrg(s);
      if (!parsed.ok) return parsed;
      out.push(parsed.value);
    }
    return ok(out);
  }

  async load(subOrgId: string): Promise<Result<string, OrgTemplateAdminView>> {
    const r = await runResult(() => this.client.orgTemplateGET(subOrgId), FAILED);
    return r.ok ? parseAdminView(r.value) : r;
  }

  async save(subOrgId: string, draft: OrgTemplate): Promise<Result<string, OrgTemplateAdminView>> {
    const r = await runSubmit(
      () => this.client.orgTemplatePUT(subOrgId, { draft: toDto(draft) }),
      FAILED,
    );
    return r.ok ? parseAdminView(r.value) : r;
  }

  async publish(subOrgId: string): Promise<Result<string, PublishResult>> {
    const r = await runSubmit(() => this.client.orgTemplatePublish(subOrgId), FAILED);
    return r.ok ? parsePublish(r.value) : r;
  }

  async rollback(subOrgId: string, version: number): Promise<Result<string, OrgTemplateAdminView>> {
    const r = await runSubmit(() => this.client.orgTemplateRollback(subOrgId, version), FAILED);
    return r.ok ? parseAdminView(r.value) : r;
  }

  /** Proefbrief: the unpublished draft rendered over a fixture letter, opened as a Blob. */
  async proefbrief(subOrgId: string): Promise<Result<string, Blob>> {
    let res: Response;
    try {
      res = await fetch(
        `${environment.apiBaseUrl}/api/v1/admin/org-template/${encodeURIComponent(subOrgId)}/preview`,
        { headers: isDevMode() ? { 'X-Role': currentRole() } : {} },
      );
    } catch {
      return err(PROEFBRIEF_FAILED);
    }
    if (!res.ok) return err(await proefbriefErrorMessage(res));
    return ok(await res.blob());
  }
}

/** Trust boundary (TE-002): maps a non-OK proefbrief response to a message. Exported
    so a spec can call it directly instead of stubbing `globalThis.fetch`. */
export async function proefbriefErrorMessage(res: Response): Promise<string> {
  try {
    return problemDetail(await res.json(), PROEFBRIEF_FAILED);
  } catch {
    return PROEFBRIEF_FAILED;
  }
}

// --- parse: wire → domain, validating at the boundary ---

function parseSubOrg(dto: SubOrgSummaryDto): Result<string, SubOrgSummary> {
  if (typeof dto.subOrgId !== 'string' || typeof dto.orgName !== 'string')
    return err('sub-org: bad shape');
  return ok({
    subOrgId: dto.subOrgId,
    orgName: dto.orgName,
    publishedVersion: dto.publishedVersion ?? 0,
  });
}

function parseVersion(dto: OrgTemplateVersionDto): Result<string, OrgTemplateVersion> {
  if (typeof dto.version !== 'number' || typeof dto.publishedAt !== 'string')
    return err('version: bad shape');
  const template = parseOrgTemplate(dto.template);
  if (!template.ok) return template;
  return ok({ version: dto.version, publishedAt: dto.publishedAt, template: template.value });
}

export function parseOrgTemplateAdminView(
  dto: OrgTemplateAdminViewDto,
): Result<string, OrgTemplateAdminView> {
  const draft = parseOrgTemplate(dto.draft);
  if (!draft.ok) return draft;
  if (typeof dto.publishedVersion !== 'number' || typeof dto.unsentBriefs !== 'number')
    return err('admin-view: bad shape');
  const history: OrgTemplateVersion[] = [];
  for (const v of dto.history ?? []) {
    const parsed = parseVersion(v);
    if (!parsed.ok) return parsed;
    history.push(parsed.value);
  }
  return ok({
    draft: draft.value,
    publishedVersion: dto.publishedVersion,
    history,
    unsentBriefs: dto.unsentBriefs,
  });
}

const parseAdminView = parseOrgTemplateAdminView;

function parsePublish(dto: PublishOrgTemplateResponse): Result<string, PublishResult> {
  if (typeof dto.version !== 'number' || typeof dto.affectedUnsentBriefs !== 'number')
    return err('publish: bad shape');
  return ok({ version: dto.version, affectedUnsentBriefs: dto.affectedUnsentBriefs });
}

// --- toDto: domain → wire (for save) ---

function toDto(t: OrgTemplate): OrgTemplateDto {
  return {
    subOrgId: t.subOrgId,
    orgName: t.orgName,
    returnAddress: t.returnAddress,
    ...(t.logoDocumentId != null ? { logoDocumentId: t.logoDocumentId } : {}),
    footerContact: t.footerContact,
    footerLegal: t.footerLegal,
    signatureName: t.signatureName,
    signatureRole: t.signatureRole,
    signatureClosing: t.signatureClosing,
    margins: { ...t.margins },
    version: t.version,
  };
}