/**
 * Create / update editorial month plans and pieces.
 * POST { action: 'create'|'upsert_piece'|'delete_piece'|'replace_plan', month, piece?, plan?, syncPipeline? }
 */
import { NextRequest, NextResponse } from 'next/server';
import { createClient } from '@/lib/supabase/server';
import { resolveActiveTenant } from '@/lib/tenant-context';
import {
  isAgencyRole,
  serviceHeaders,
  supabaseUrl,
  userRole,
} from '@/lib/agency';
import {
  asPlanObject,
  emptyMonthPlan,
  newPieceId,
  buildCaption,
  mapFormatToPipeline,
  scheduledAtFromPiece,
  type CalendarDoc,
} from '@/lib/calendar-documents';
import { monthLabel } from '@/lib/calendar-import';
import { sanitizePublishCaption } from '@/lib/publish-caption';
import { enrichPieceFromCatalog } from '@/lib/calendar-template';
import type { RrssMonthPlan, RrssPiece } from '@/components/RrssMonthView';

export const dynamic = 'force-dynamic';

function str(v: unknown, max = 4000): string {
  return typeof v === 'string' ? v.trim().slice(0, max) : '';
}

async function loadMonthDoc(
  base: string,
  headers: Record<string, string>,
  tenantId: string,
  month: string
): Promise<{ doc: CalendarDoc | null; plan: RrssMonthPlan | null }> {
  const r = await fetch(
    `${base}/rest/v1/documents?tenant_id=eq.${encodeURIComponent(
      tenantId
    )}&type=eq.calendar&select=id,title,content`,
    { headers, cache: 'no-store' }
  );
  if (!r.ok) return { doc: null, plan: null };
  const docs = (await r.json()) as CalendarDoc[];
  for (const d of docs) {
    const plan = asPlanObject(d.content) as RrssMonthPlan | null;
    if (plan && plan.month === month) {
      return { doc: d, plan: plan as unknown as RrssMonthPlan };
    }
  }
  return { doc: null, plan: null };
}

async function savePlan(
  base: string,
  headers: Record<string, string>,
  tenantId: string,
  plan: RrssMonthPlan,
  existingId?: string | null
) {
  const title = `RRSS ${plan.label || monthLabel(plan.month)}`;
  if (existingId) {
    const patch = await fetch(
      `${base}/rest/v1/documents?id=eq.${encodeURIComponent(existingId)}`,
      {
        method: 'PATCH',
        headers: {
          ...headers,
          'Content-Type': 'application/json',
          Prefer: 'return=representation',
        },
        body: JSON.stringify({
          title,
          content: plan,
          status: 'approved',
          updated_at: new Date().toISOString(),
        }),
      }
    );
    if (!patch.ok) throw new Error(await patch.text());
    const rows = await patch.json();
    return Array.isArray(rows) ? rows[0] : rows;
  }
  const ins = await fetch(`${base}/rest/v1/documents`, {
    method: 'POST',
    headers: {
      ...headers,
      'Content-Type': 'application/json',
      Prefer: 'return=representation',
    },
    body: JSON.stringify({
      tenant_id: tenantId,
      type: 'calendar',
      title,
      content: plan,
      status: 'approved',
    }),
  });
  if (!ins.ok) throw new Error(await ins.text());
  const rows = await ins.json();
  return Array.isArray(rows) ? rows[0] : rows;
}

function normalizePiece(
  raw: Record<string, unknown>,
  fallbackDate: string
): RrssPiece {
  const date = str(raw.date, 10) || fallbackDate;
  const title = str(raw.title, 160) || 'Sin título';
  const format = str(raw.format, 40) || 'Post';
  const kindRaw = str(raw.kind, 20);
  const kind =
    kindRaw ||
    (/stor/i.test(format) ? 'story' : /reel/i.test(format) ? 'reel' : 'post');
  const cleanBody = sanitizePublishCaption(
    str(raw.body, 4000) || title,
    { maxLen: 4000 }
  ).caption;
  const enriched = enrichPieceFromCatalog({
    title,
    platform: str(raw.platform, 40) || 'instagram',
    format,
    pillar: str(raw.pillar, 80),
    time: str(raw.time, 5),
    cta: str(raw.cta, 200),
    hashtags: str(raw.hashtags, 500),
    hook: str(raw.hook, 300),
    body: cleanBody,
  });
  return {
    id: str(raw.id, 120) || newPieceId(date, title),
    date,
    time: enriched.time || '10:30',
    platform: (enriched.platform || 'instagram').toLowerCase(),
    format: enriched.format || format,
    pillar: enriched.pillar || undefined,
    title: enriched.title,
    hook: enriched.hook || enriched.title,
    body: enriched.body || enriched.title,
    cta: enriched.cta || undefined,
    hashtags: enriched.hashtags || undefined,
    objective_metric: str(raw.objective_metric || raw.objetivo, 200) || undefined,
    status: str(raw.status, 40) || 'planned',
    kind,
    color:
      kind === 'story'
        ? '#374151'
        : /linkedin/i.test(enriched.platform || '')
          ? '#7C66B8'
          : '#2071cf',
  };
}

async function syncPieceToPipeline(
  base: string,
  headers: Record<string, string>,
  tenantId: string,
  userId: string,
  piece: RrssPiece,
  month: string
) {
  const caption = sanitizePublishCaption(
    buildCaption(piece) || piece.title,
    { maxLen: 4000 }
  ).caption;
  // Find existing by calendar_piece_id
  const find = await fetch(
    `${base}/rest/v1/creative_pipeline?tenant_id=eq.${encodeURIComponent(
      tenantId
    )}&calendar_piece_id=eq.${encodeURIComponent(piece.id)}&select=id&limit=1`,
    { headers, cache: 'no-store' }
  );
  const existing = find.ok ? ((await find.json()) as { id: string }[]) : [];
  const row: Record<string, unknown> = {
    title: piece.title,
    format: mapFormatToPipeline(piece.format, piece.kind),
    month,
    caption: caption || null,
    notes: piece.pillar ? `Pilar: ${piece.pillar}` : null,
    calendar_piece_id: piece.id,
    scheduled_at: scheduledAtFromPiece(piece),
    channels:
      (piece.platform || '').toLowerCase() === 'facebook'
        ? ['facebook', 'instagram']
        : ['instagram', 'facebook'],
    updated_at: new Date().toISOString(),
  };
  if (existing[0]?.id) {
    await fetch(
      `${base}/rest/v1/creative_pipeline?id=eq.${encodeURIComponent(existing[0].id)}`,
      {
        method: 'PATCH',
        headers: {
          ...headers,
          'Content-Type': 'application/json',
          Prefer: 'return=minimal',
        },
        body: JSON.stringify(row),
      }
    );
    return existing[0].id;
  }
  const ins = await fetch(`${base}/rest/v1/creative_pipeline`, {
    method: 'POST',
    headers: {
      ...headers,
      'Content-Type': 'application/json',
      Prefer: 'return=representation',
    },
    body: JSON.stringify({
      ...row,
      tenant_id: tenantId,
      status: 'borrador',
      publish_status: 'idle',
      created_by: userId,
    }),
  });
  if (!ins.ok) return null;
  const rows = (await ins.json()) as { id: string }[];
  return rows[0]?.id || null;
}

export async function POST(req: NextRequest) {
  const supabase = await createClient();
  const {
    data: { user },
  } = await supabase.auth.getUser();
  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }
  if (!isAgencyRole(userRole(user))) {
    return NextResponse.json({ error: 'Solo agencia' }, { status: 403 });
  }
  const ctx = await resolveActiveTenant(user);
  if (!ctx.tenantId || ctx.portfolioWide) {
    return NextResponse.json(
      { error: 'Selecciona un cliente en Contexto.' },
      { status: 400 }
    );
  }
  const headers = serviceHeaders();
  const base = supabaseUrl();
  if (!headers || !base) {
    return NextResponse.json({ error: 'Service role required' }, { status: 503 });
  }

  const body = (await req.json().catch(() => ({}))) as Record<string, unknown>;
  const action = str(body.action, 40) || 'create';
  const month = str(body.month, 7);
  if (!/^\d{4}-\d{2}$/.test(month)) {
    return NextResponse.json({ error: 'month YYYY-MM requerido' }, { status: 400 });
  }

  const { doc, plan: existing } = await loadMonthDoc(
    base,
    headers,
    ctx.tenantId,
    month
  );

  try {
    if (action === 'create') {
      if (existing && !(body.force === true)) {
        return NextResponse.json({
          ok: true,
          existed: true,
          plan: existing,
          document_id: doc?.id,
        });
      }
      const seed = body.plan as RrssMonthPlan | undefined;
      const plan =
        seed && seed.month === month
          ? seed
          : emptyMonthPlan(month, ctx.label);
      const saved = await savePlan(
        base,
        headers,
        ctx.tenantId,
        plan,
        body.force === true ? doc?.id : null
      );
      return NextResponse.json({
        ok: true,
        created: true,
        plan,
        document_id: saved?.id,
      });
    }

    if (action === 'replace_plan') {
      const seed = body.plan as RrssMonthPlan | undefined;
      if (!seed || seed.month !== month) {
        return NextResponse.json({ error: 'plan inválido' }, { status: 400 });
      }
      const saved = await savePlan(base, headers, ctx.tenantId, seed, doc?.id);
      return NextResponse.json({
        ok: true,
        plan: seed,
        document_id: saved?.id,
      });
    }

    if (action === 'upsert_piece') {
      const raw = (body.piece || {}) as Record<string, unknown>;
      const piece = normalizePiece(raw, `${month}-01`);
      if (!piece.date.startsWith(month)) {
        return NextResponse.json(
          { error: 'La fecha debe pertenecer al mes' },
          { status: 400 }
        );
      }
      let plan = existing || emptyMonthPlan(month, ctx.label);
      const idx = plan.pieces.findIndex((p) => p.id === piece.id);
      if (idx >= 0) plan.pieces[idx] = { ...plan.pieces[idx], ...piece };
      else plan.pieces.push(piece);
      plan.pieces.sort((a, b) => a.date.localeCompare(b.date));
      plan.hero = {
        ...plan.hero,
        chips: [`${plan.pieces.length} piezas`],
      };
      const saved = await savePlan(base, headers, ctx.tenantId, plan, doc?.id);
      let pipelineId: string | null = null;
      if (body.syncPipeline !== false) {
        pipelineId = await syncPieceToPipeline(
          base,
          headers,
          ctx.tenantId,
          user.id,
          piece,
          month
        );
      }
      return NextResponse.json({
        ok: true,
        piece,
        plan,
        document_id: saved?.id,
        pipeline_id: pipelineId,
      });
    }

    if (action === 'delete_piece') {
      const pieceId = str(body.pieceId || (body.piece as { id?: string })?.id, 120);
      if (!pieceId || !existing) {
        return NextResponse.json({ error: 'pieza no encontrada' }, { status: 404 });
      }
      const plan = {
        ...existing,
        pieces: existing.pieces.filter((p) => p.id !== pieceId),
      };
      plan.hero = {
        ...plan.hero,
        chips: [`${plan.pieces.length} piezas`],
      };
      const saved = await savePlan(base, headers, ctx.tenantId, plan, doc?.id);
      return NextResponse.json({
        ok: true,
        plan,
        document_id: saved?.id,
      });
    }

    return NextResponse.json({ error: 'action desconocida' }, { status: 400 });
  } catch (e) {
    return NextResponse.json(
      { error: e instanceof Error ? e.message.slice(0, 400) : 'Error' },
      { status: 500 }
    );
  }
}

export async function GET(req: NextRequest) {
  const supabase = await createClient();
  const {
    data: { user },
  } = await supabase.auth.getUser();
  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }
  const ctx = await resolveActiveTenant(user);
  if (!ctx.tenantId || ctx.portfolioWide) {
    return NextResponse.json({ error: 'Selecciona un cliente' }, { status: 400 });
  }
  const headers = serviceHeaders();
  const base = supabaseUrl();
  if (!headers || !base) {
    return NextResponse.json({ error: 'Service role required' }, { status: 503 });
  }
  const month = req.nextUrl.searchParams.get('month') || '';
  if (!/^\d{4}-\d{2}$/.test(month)) {
    return NextResponse.json({ error: 'month requerido' }, { status: 400 });
  }
  const { doc, plan } = await loadMonthDoc(base, headers, ctx.tenantId, month);
  return NextResponse.json({
    ok: true,
    plan,
    document_id: doc?.id || null,
    exists: Boolean(plan),
  });
}