import type {
  FunnelRow,
  MediaMetric,
  MediaPublication,
  MediaPublicationStatus,
  MetricCsvMapping,
  TeaserWeights,
  Utm,
} from "@rakazo/contracts";
import { MetricCsvMappingSchema, TeaserWeightsSchema } from "@rakazo/contracts";
import type { MediaPublication as MediaPublicationRow, PrismaClient } from "./client.js";
import { Prisma } from "./client.js";
import type { MediaDb, MediaPage, MediaPageInput } from "./media-shared.js";
import {
  decodeKeysetCursor,
  InvalidMediaInputError,
  isUniqueViolation,
  MediaStateConflictError,
  mapMediaMetric,
  mapMediaPublication,
  mapMetricMapping,
  pageLimit,
  toPage,
} from "./media-shared.js";
import { IsolationError } from "./scope.js";

export interface NewMediaPublication {
  renderId: string;
  destination: string;
  targetUrl: string | null;
  trackingUrl: string | null;
  utm: Utm | null;
  title: string | null;
  caption: string | null;
  tags: string[];
  thumbnailVariant: string | null;
  scheduledAt: Date | null;
}

export type PublicationKey = MetricCsvMapping["publicationKey"];

export type NewMediaMetric = Omit<MediaMetric, "id">;

export interface TeaserModelRecord {
  weights: TeaserWeights;
  sampleCount: number;
  updatedAt: string;
}

function assertMetric(metric: NewMediaMetric): void {
  for (const value of [metric.views, metric.clicks, metric.conversions, metric.revenueCents]) {
    if (!Number.isInteger(value) || value < 0) {
      throw new InvalidMediaInputError("Metric values must be non-negative integers");
    }
  }
  if (!/^[A-Z]{3}$/.test(metric.currency)) throw new InvalidMediaInputError("Invalid currency");
}

/** Publications, their metrics and the learned teaser weights. */
export function createMediaPublishingRepos(prisma: PrismaClient) {
  async function requireRender(spaceId: string, renderId: string) {
    const row = await prisma.mediaRender.findFirst({ where: { id: renderId, spaceId } });
    if (!row) throw new IsolationError();
    return row;
  }

  async function requireProject(spaceId: string, projectId: string): Promise<void> {
    const row = await prisma.mediaProject.findFirst({
      where: { id: projectId, spaceId },
      select: { id: true },
    });
    if (!row) throw new IsolationError();
  }

  async function requirePublication(spaceId: string, publicationId: string) {
    const row = await prisma.mediaPublication.findFirst({ where: { id: publicationId, spaceId } });
    if (!row) throw new IsolationError();
    return row;
  }

  /** Only a finished render that passed its gate can be published. */
  async function createPublication(
    spaceId: string,
    createdBy: string,
    input: NewMediaPublication,
  ): Promise<MediaPublication> {
    const render = await requireRender(spaceId, input.renderId);
    if (render.status !== "done") {
      throw new MediaStateConflictError("Only a finished render can be published");
    }
    const row = await prisma.mediaPublication.create({
      data: {
        spaceId,
        createdBy,
        renderId: render.id,
        profileId: render.profileId,
        destination: input.destination,
        status: input.scheduledAt ? "scheduled" : "draft",
        scheduledAt: input.scheduledAt,
        targetUrl: input.targetUrl,
        trackingUrl: input.trackingUrl,
        utm: input.utm === null ? Prisma.DbNull : (input.utm as Prisma.InputJsonObject),
        title: input.title,
        caption: input.caption,
        tags: input.tags,
        thumbnailVariant: input.thumbnailVariant,
      },
    });
    return mapMediaPublication(row);
  }

  async function getPublication(spaceId: string, publicationId: string): Promise<MediaPublication> {
    return mapMediaPublication(await requirePublication(spaceId, publicationId));
  }

  async function getPublicationRecord(
    spaceId: string,
    publicationId: string,
  ): Promise<MediaPublicationRow> {
    return requirePublication(spaceId, publicationId);
  }

  async function listPublications(
    spaceId: string,
    input: MediaPageInput & { projectId?: string } = {},
  ): Promise<MediaPage<MediaPublication>> {
    const limit = pageLimit(input.limit);
    const cursor = input.cursor ? decodeKeysetCursor(input.cursor) : null;
    if (cursor && !cursor.at) throw new InvalidMediaInputError("Invalid cursor");
    const rows = await prisma.mediaPublication.findMany({
      where: {
        spaceId,
        ...(input.projectId ? { render: { projectId: input.projectId, spaceId } } : {}),
        ...(cursor?.at
          ? {
              OR: [
                { createdAt: { lt: cursor.at } },
                { createdAt: cursor.at, id: { lt: cursor.id } },
              ],
            }
          : {}),
      },
      orderBy: [{ createdAt: "desc" }, { id: "desc" }],
      take: limit + 1,
    });
    return toPage(rows, limit, (row) => ({ at: row.createdAt, id: row.id }), mapMediaPublication);
  }

  async function transitionPublication(
    spaceId: string,
    publicationId: string,
    from: MediaPublicationStatus[],
    data: Prisma.MediaPublicationUpdateManyMutationInput,
  ): Promise<MediaPublication> {
    const result = await prisma.mediaPublication.updateMany({
      where: { id: publicationId, spaceId, status: { in: from } },
      data,
    });
    const row = await requirePublication(spaceId, publicationId);
    if (result.count !== 1) {
      throw new MediaStateConflictError(`Publication is already ${row.status}`);
    }
    return mapMediaPublication(row);
  }

  async function schedulePublication(
    spaceId: string,
    publicationId: string,
    scheduledAt: Date,
  ): Promise<MediaPublication> {
    return transitionPublication(spaceId, publicationId, ["draft", "scheduled", "failed"], {
      status: "scheduled",
      scheduledAt,
    });
  }

  async function cancelPublication(
    spaceId: string,
    publicationId: string,
  ): Promise<MediaPublication> {
    return transitionPublication(
      spaceId,
      publicationId,
      ["draft", "scheduled", "bundled", "failed"],
      { status: "canceled" },
    );
  }

  async function markPublicationBundled(
    spaceId: string,
    publicationId: string,
    bundleArtifactId: string | null,
  ): Promise<MediaPublication> {
    return transitionPublication(
      spaceId,
      publicationId,
      ["draft", "scheduled", "bundled", "failed"],
      { status: "bundled", bundleArtifactId },
    );
  }

  async function markPublicationPublished(
    spaceId: string,
    publicationId: string,
    externalUrl: string | null,
    publishedAt: Date = new Date(),
  ): Promise<MediaPublication> {
    return transitionPublication(spaceId, publicationId, ["draft", "scheduled", "bundled"], {
      status: "published",
      externalUrl,
      publishedAt,
    });
  }

  async function markPublicationFailed(
    spaceId: string,
    publicationId: string,
  ): Promise<MediaPublication> {
    return transitionPublication(spaceId, publicationId, ["draft", "scheduled", "bundled"], {
      status: "failed",
    });
  }

  /**
   * Map CSV keys to publication ids of this space. Values that match nothing (or a
   * publication in another space) are absent from the result.
   */
  async function resolvePublicationKeys(
    spaceId: string,
    key: PublicationKey,
    values: string[],
  ): Promise<Map<string, string>> {
    const wanted = new Set(values.map((value) => value.trim()).filter(Boolean));
    if (wanted.size === 0) return new Map();
    const rows = await prisma.mediaPublication.findMany({
      where: {
        spaceId,
        ...(key === "id" ? { id: { in: [...wanted] } } : {}),
        ...(key === "tracking_url" ? { trackingUrl: { in: [...wanted] } } : {}),
        ...(key === "external_url" ? { externalUrl: { in: [...wanted] } } : {}),
      },
      select: { id: true, trackingUrl: true, externalUrl: true, utm: true },
    });
    const resolved = new Map<string, string>();
    for (const row of rows) {
      const utm = row.utm as { content?: unknown } | null;
      const value =
        key === "id"
          ? row.id
          : key === "tracking_url"
            ? row.trackingUrl
            : key === "external_url"
              ? row.externalUrl
              : typeof utm?.content === "string"
                ? utm.content
                : null;
      if (value && wanted.has(value) && !resolved.has(value)) resolved.set(value, row.id);
    }
    return resolved;
  }

  // -------------------------------------------------------------------------
  // Metrics
  // -------------------------------------------------------------------------

  async function upsertMetric(db: MediaDb, spaceId: string, metric: NewMediaMetric) {
    assertMetric(metric);
    const observedAt = new Date(metric.observedAt);
    if (Number.isNaN(observedAt.getTime())) throw new InvalidMediaInputError("Invalid date");
    const values = {
      views: metric.views,
      clicks: metric.clicks,
      conversions: metric.conversions,
      revenueCents: metric.revenueCents,
      currency: metric.currency,
    };
    return db.mediaMetric.upsert({
      where: {
        publicationId_observedAt_source: {
          publicationId: metric.publicationId,
          observedAt,
          source: metric.source,
        },
      },
      create: {
        ...values,
        spaceId,
        publicationId: metric.publicationId,
        observedAt,
        source: metric.source,
      },
      update: values,
    });
  }

  /** One observation; re-recording the same (publication, time, source) replaces it. */
  async function recordMetric(spaceId: string, metric: NewMediaMetric): Promise<MediaMetric> {
    await requirePublication(spaceId, metric.publicationId);
    return mapMediaMetric(await upsertMetric(prisma, spaceId, metric));
  }

  /** Batch import, all or nothing. */
  async function recordMetrics(spaceId: string, metrics: NewMediaMetric[]): Promise<number> {
    if (metrics.length === 0) return 0;
    return prisma.$transaction(
      async (tx) => {
        const ids = [...new Set(metrics.map((metric) => metric.publicationId))];
        const owned = await tx.mediaPublication.count({ where: { spaceId, id: { in: ids } } });
        if (owned !== ids.length) throw new IsolationError();
        for (const metric of metrics) await upsertMetric(tx, spaceId, metric);
        return metrics.length;
      },
      { timeout: 60_000 },
    );
  }

  async function listMetrics(spaceId: string, publicationId: string): Promise<MediaMetric[]> {
    await requirePublication(spaceId, publicationId);
    const rows = await prisma.mediaMetric.findMany({
      where: { spaceId, publicationId },
      orderBy: [{ observedAt: "asc" }, { source: "asc" }],
    });
    return rows.map(mapMediaMetric);
  }

  async function saveMetricMapping(
    spaceId: string,
    input: MetricCsvMapping,
  ): Promise<MetricCsvMapping> {
    const parsed = MetricCsvMappingSchema.safeParse(input);
    if (!parsed.success) throw new InvalidMediaInputError("Invalid CSV mapping");
    const { id, ...mapping } = parsed.data;
    const json = mapping as Prisma.InputJsonObject;
    try {
      if (id) {
        const result = await prisma.mediaMetricMapping.updateMany({
          where: { id, spaceId },
          data: { name: mapping.name, mapping: json },
        });
        if (result.count !== 1) throw new IsolationError();
        return getMetricMapping(spaceId, id);
      }
      const row = await prisma.mediaMetricMapping.upsert({
        where: { spaceId_name: { spaceId, name: mapping.name } },
        create: { spaceId, name: mapping.name, mapping: json },
        update: { mapping: json },
      });
      return mapMetricMapping(row);
    } catch (error) {
      if (isUniqueViolation(error)) throw new InvalidMediaInputError("Mapping name already used");
      throw error;
    }
  }

  async function listMetricMappings(spaceId: string): Promise<MetricCsvMapping[]> {
    const rows = await prisma.mediaMetricMapping.findMany({
      where: { spaceId },
      orderBy: [{ name: "asc" }, { id: "asc" }],
    });
    return rows.map(mapMetricMapping);
  }

  async function getMetricMapping(spaceId: string, id: string): Promise<MetricCsvMapping> {
    const row = await prisma.mediaMetricMapping.findFirst({ where: { id, spaceId } });
    if (!row) throw new IsolationError();
    return mapMetricMapping(row);
  }

  /**
   * Views → clicks → conversions → revenue per publication. Observations are
   * cumulative snapshots, so only the latest one per (publication, source) counts;
   * importing the same report twice never doubles the numbers.
   */
  async function funnel(spaceId: string, projectId?: string): Promise<FunnelRow[]> {
    if (projectId) await requireProject(spaceId, projectId);
    const rows = await prisma.$queryRaw<
      Array<{
        publicationId: string;
        projectId: string;
        profileId: string;
        variant: string | null;
        thumbnailVariant: string | null;
        views: bigint;
        clicks: bigint;
        conversions: bigint;
        revenueCents: bigint;
        currency: string | null;
      }>
    >(Prisma.sql`
      WITH latest AS (
        SELECT DISTINCT ON (m."publicationId", m.source)
          m."publicationId", m.views, m.clicks, m.conversions, m."revenueCents", m.currency
        FROM media_metrics m
        WHERE m."spaceId" = ${spaceId}
        ORDER BY m."publicationId", m.source, m."observedAt" DESC, m.id DESC
      )
      SELECT p.id AS "publicationId", r."projectId", p."profileId",
        p.utm ->> 'content' AS variant, p."thumbnailVariant",
        coalesce(sum(l.views), 0)::bigint AS views,
        coalesce(sum(l.clicks), 0)::bigint AS clicks,
        coalesce(sum(l.conversions), 0)::bigint AS conversions,
        coalesce(sum(l."revenueCents"), 0)::bigint AS "revenueCents",
        min(l.currency) AS currency
      FROM media_publications p
      JOIN media_renders r ON r.id = p."renderId" AND r."spaceId" = p."spaceId"
      LEFT JOIN latest l ON l."publicationId" = p.id
      WHERE p."spaceId" = ${spaceId}
        ${projectId ? Prisma.sql`AND r."projectId" = ${projectId}` : Prisma.empty}
      GROUP BY p.id, r."projectId"
      ORDER BY p."createdAt" DESC, p.id DESC
    `);
    return rows.map((row) => ({
      publicationId: row.publicationId,
      projectId: row.projectId,
      profileId: row.profileId,
      variant: row.variant,
      thumbnailVariant: row.thumbnailVariant,
      views: Number(row.views),
      clicks: Number(row.clicks),
      conversions: Number(row.conversions),
      revenueCents: Number(row.revenueCents),
      currency: row.currency ?? "EUR",
    }));
  }

  /** Publications with at least one metric: the sample size for teaser learning. */
  async function publicationsWithMetricsCount(spaceId: string): Promise<number> {
    return prisma.mediaPublication.count({ where: { spaceId, metrics: { some: {} } } });
  }

  // -------------------------------------------------------------------------
  // Teaser model
  // -------------------------------------------------------------------------

  async function getTeaserModel(spaceId: string): Promise<TeaserModelRecord | null> {
    const row = await prisma.mediaTeaserModel.findUnique({ where: { spaceId } });
    if (!row) return null;
    const weights = TeaserWeightsSchema.safeParse(row.weights);
    if (!weights.success) return null;
    return {
      weights: weights.data,
      sampleCount: row.sampleCount,
      updatedAt: row.updatedAt.toISOString(),
    };
  }

  async function putTeaserModel(
    spaceId: string,
    weights: TeaserWeights,
    sampleCount: number,
  ): Promise<TeaserModelRecord> {
    const parsed = TeaserWeightsSchema.safeParse(weights);
    if (!parsed.success || !Number.isInteger(sampleCount) || sampleCount < 0) {
      throw new InvalidMediaInputError("Invalid teaser model");
    }
    const json = parsed.data as Prisma.InputJsonObject;
    const row = await prisma.mediaTeaserModel.upsert({
      where: { spaceId },
      create: { spaceId, weights: json, sampleCount },
      update: { weights: json, sampleCount },
    });
    return {
      weights: parsed.data,
      sampleCount: row.sampleCount,
      updatedAt: row.updatedAt.toISOString(),
    };
  }

  /** Back to default weights. */
  async function resetTeaserModel(spaceId: string): Promise<void> {
    await prisma.mediaTeaserModel.deleteMany({ where: { spaceId } });
  }

  return {
    createPublication,
    getPublication,
    getPublicationRecord,
    listPublications,
    schedulePublication,
    cancelPublication,
    markPublicationBundled,
    markPublicationPublished,
    markPublicationFailed,
    resolvePublicationKeys,
    recordMetric,
    recordMetrics,
    listMetrics,
    saveMetricMapping,
    listMetricMappings,
    getMetricMapping,
    funnel,
    publicationsWithMetricsCount,
    getTeaserModel,
    putTeaserModel,
    resetTeaserModel,
  };
}