/**
 * Report Generator plugin API client.
 *
 * All requests use the shared `apiClient` (`baseURL: '/api/v1'`) and target the
 * Report Generator plugin routes under `/reports/...`.
 */

import { apiClient, apiDelete, apiGet, apiPost, apiPut } from './client';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';

// ─── Types ─────────────────────────────────────────────────────────────────

export type OutputFormat = 'csv' | 'excel' | 'json' | 'pdf' | 'print';
export type TemplateType = 'jinja2' | 'sql';

export interface ReportTemplate {
  id: string;
  name: string;
  description: string;
  template_type: TemplateType;
  content: string;
  output_format: OutputFormat;
  created_by: string;
  deleted_at?: string | null;
  created_at?: string | null;
  updated_at?: string | null;
}

export interface TemplateCreateInput {
  name: string;
  description?: string;
  template_type?: TemplateType;
  content: string;
  output_format?: OutputFormat;
}

export interface TemplateUpdateInput {
  name?: string;
  description?: string;
  template_type?: TemplateType;
  content?: string;
  output_format?: OutputFormat;
}

export interface ReportGenerateInput {
  template_id: string;
  data: Record<string, unknown>;
  output_format?: OutputFormat;
}

export interface PresetReportInfo {
  key: string;
  name: string;
  description: string;
  icon: string;
  output_formats: OutputFormat[];
}

export interface PresetGenerateInput {
  preset: string;
  output_format: OutputFormat;
  parameters: Record<string, unknown>;
}

// ─── React Query Hooks ─────────────────────────────────────────────────────

const QUERY_KEYS = {
  templates: ['reports', 'templates'] as const,
  presets: ['reports', 'presets'] as const,
};

/** Fetch all report templates */
export function useReportTemplates() {
  return useQuery<ReportTemplate[]>({
    queryKey: QUERY_KEYS.templates,
    queryFn: () => apiGet<ReportTemplate[]>('/reports/templates'),
  });
}

/** Fetch a single report template by ID */
export function useReportTemplate(templateId: string | null) {
  return useQuery<ReportTemplate>({
    queryKey: ['reports', 'templates', templateId],
    queryFn: () => apiGet<ReportTemplate>(`/reports/templates/${templateId}`),
    enabled: !!templateId,
  });
}

/** Create a new report template */
export function useCreateReportTemplate() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (input: TemplateCreateInput) =>
      apiPost<ReportTemplate>('/reports/templates', input),
    onSuccess: () => qc.invalidateQueries({ queryKey: QUERY_KEYS.templates }),
  });
}

/** Update an existing report template */
export function useUpdateReportTemplate() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: ({ id, ...input }: TemplateUpdateInput & { id: string }) =>
      apiPut<ReportTemplate>(`/reports/templates/${id}`, input),
    onSuccess: () => qc.invalidateQueries({ queryKey: QUERY_KEYS.templates }),
  });
}

/** Delete a report template (soft-delete) */
export function useDeleteReportTemplate() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (id: string) => apiDelete(`/reports/templates/${id}`),
    onSuccess: () => qc.invalidateQueries({ queryKey: QUERY_KEYS.templates }),
  });
}

/** Fetch all preset report templates */
export function useReportPresets() {
  return useQuery<PresetReportInfo[]>({
    queryKey: QUERY_KEYS.presets,
    queryFn: async () => {
      const res = await apiGet<PresetReportInfo[] | { items: PresetReportInfo[] }>('/reports/presets');
      return Array.isArray(res) ? res : res.items ?? [];
    },
  });
}

/** Generate a report from a template — returns a file download (blob) */
export function useGenerateReport() {
  return useMutation({
    mutationFn: async (input: ReportGenerateInput) => {
      const response = await apiClient.post('/reports/generate', input, {
        responseType: 'blob',
      });
      return response;
    },
  });
}

/** Generate a preset report — returns a file download (blob) */
export function useGeneratePresetReport() {
  return useMutation({
    mutationFn: async (input: PresetGenerateInput) => {
      const response = await apiClient.post('/reports/presets/generate', input, {
        responseType: 'blob',
      });
      return response;
    },
  });
}

// ─── Download Helper ───────────────────────────────────────────────────────

/** Trigger a browser download from a blob response */
export function downloadBlob(blob: Blob, filename: string) {
  const url = window.URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.href = url;
  link.download = filename;
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  window.URL.revokeObjectURL(url);
}