import { v } from "convex/values";

import { normalizeListLimit } from "./domain";
import { internalMutation, mutation, query } from "./_generated/server";
import type { Doc, Id } from "./_generated/dataModel";
import type { MutationCtx, QueryCtx } from "./_generated/server";

export const AUDIT_REVIEW_NOTICE_AFTER_MS = 30 * 24 * 60 * 60 * 1000;

const auditStatus = v.union(
  v.literal("draft"),
  v.literal("approved"),
  v.literal("published"),
  v.literal("deactivated"),
);
const usedSkillsValidator = v.array(
  v.object({
    id: v.optional(v.string()),
    name: v.string(),
    category: v.optional(v.string()),
    version: v.optional(v.string()),
    source: v.optional(v.string()),
  }),
);
const skillSummaryValidator = v.array(
  v.object({
    name: v.string(),
    purpose: v.string(),
    summary: v.string(),
  }),
);
const publicObservationValidator = v.object({
  title: v.string(),
  observation: v.string(),
  impact: v.string(),
  suggestion: v.string(),
  screenshotIds: v.optional(v.array(v.id("_storage"))),
});
const publicOfferValidator = v.object({
  body: v.string(),
  ctaLabel: v.optional(v.string()),
  ctaHref: v.optional(v.string()),
});

type AuditDashboardRow =
  | {
      kind: "audit";
      id: Id<"audits">;
      auditId: Id<"audits">;
      slug: string;
      title: string;
      checkedDomain: string;
      status: Doc<"audits">["status"];
      pageCount: number;
      checkedPages: string[];
      detailHref: string;
      createdAt: number;
      updatedAt: number;
    }
  | {
      kind: "generation";
      id: Id<"agentRuns">;
      runId: Id<"agentRuns">;
      leadId: Id<"leads"> | null;
      title: string;
      checkedDomain: string;
      status: Doc<"agentRuns">["status"];
      latestStage: string;
      stageStatus: Doc<"agentRuns">["status"];
      errorSummary: string | null;
      pageCount: number;
      checkedPages: string[];
      createdAt: number;
      updatedAt: number;
    };

const requireOperator = async (ctx: MutationCtx | QueryCtx) => {
  const identity = await ctx.auth.getUserIdentity();
  if (!identity) {
    throw new Error("Nicht autorisiert.");
  }
};

const domainFromLead = (
  lead: Pick<Doc<"leads">, "companyName" | "websiteDomain" | "websiteUrl"> | null,
) => {
  if (lead?.websiteDomain) {
    return lead.websiteDomain;
  }

  if (lead?.websiteUrl) {
    try {
      return new URL(lead.websiteUrl).hostname;
    } catch {
      return lead.websiteUrl;
    }
  }

  return "unbekannte-domain";
};

const latestGenerationStage = (stages: Doc<"auditGenerations">[]) => {
  return [...stages].sort((a, b) => b.updatedAt - a.updatedAt)[0] ?? null;
};

const toIsoDate = (timestamp: number | undefined, fallback: number) => {
  return new Date(timestamp ?? fallback).toISOString();
};

const fallbackObservation = (audit: {
  publicSummary?: string;
  publicBody?: string;
  textFindings?: string[];
}) => {
  const firstFinding = audit.textFindings?.find((finding) => finding.trim().length > 0);

  return {
    title: "Wichtigster Hebel",
    observation: firstFinding ?? audit.publicSummary ?? "Die Website hat bereits eine gute Grundlage.",
    impact: "Unklare Nutzerführung kann qualifizierte Anfragen kosten.",
    suggestion:
      audit.publicBody ??
      "Priorisieren Sie die sichtbarsten Kontaktwege und testen Sie die wichtigsten Seiten mobil.",
  };
};

const publicContentForAudit = (audit: {
  checkedDomain: string;
  publicSummary?: string;
  publicBody?: string;
  publicObservations?: Array<{
    title: string;
    observation: string;
    impact: string;
    suggestion: string;
    screenshotIds?: string[];
  }>;
  publicOffer?: {
    body: string;
    ctaLabel?: string;
    ctaHref?: string;
  };
  textFindings?: string[];
}) => {
  const observations = audit.publicObservations?.length
    ? audit.publicObservations
    : [fallbackObservation(audit)];

  return {
    headline: audit.publicSummary ?? `Website-Audit fuer ${audit.checkedDomain}`,
    intro:
      audit.publicBody ??
      "Diese Kurzfassung zeigt die wichtigsten oeffentlichen Findings aus dem geprueften Website-Audit.",
    observations,
    finalOffer:
      audit.publicOffer ?? {
        body: "Wenn Sie die naechsten Verbesserungen priorisieren moechten, besprechen wir die sinnvollsten Schritte gemeinsam.",
        ctaLabel: "Audit besprechen",
      },
  };
};

const screenshotAlt = (viewport: "desktop" | "mobile", sourceUrl: string) => {
  return `${viewport === "desktop" ? "Desktop" : "Mobile"} Screenshot von ${sourceUrl}`;
};

export const create = mutation({
  args: {
    leadId: v.id("leads"),
    slug: v.string(),
    checkedDomain: v.string(),
    checkedPages: v.array(v.string()),
    usedSkills: v.optional(usedSkillsValidator),
    status: v.optional(auditStatus),
    internalSummary: v.optional(v.string()),
    publicSummary: v.optional(v.string()),
    publicBody: v.optional(v.string()),
    publicObservations: v.optional(v.array(publicObservationValidator)),
    publicOffer: v.optional(publicOfferValidator),
    ctaType: v.optional(v.string()),
  },
  handler: async (ctx, args) => {
    await requireOperator(ctx);

    const now = Date.now();
    const existing = await ctx.db
      .query("audits")
      .withIndex("by_slug", (q) => q.eq("slug", args.slug))
      .take(1);

    if (existing.length > 0) {
      throw new Error("Audit slug already exists.");
    }

    return await ctx.db.insert("audits", {
      ...args,
      status: args.status ?? "draft",
      createdAt: now,
      updatedAt: now,
    });
  },
});

export const getDetail = query({
  args: { id: v.id("audits") },
  handler: async (ctx, args) => {
    await requireOperator(ctx);

    const audit = await ctx.db.get(args.id);
    if (!audit) {
      return null;
    }

    const lead = await ctx.db.get(audit.leadId);
    return { audit, lead };
  },
});

export const get = query({
  args: { id: v.id("audits") },
  handler: async (ctx, args) => {
    await requireOperator(ctx);

    return await ctx.db.get(args.id);
  },
});

export const upsertFromAuditGeneration = internalMutation({
  args: {
    leadId: v.id("leads"),
    runId: v.id("agentRuns"),
    auditId: v.optional(v.id("audits")),
    checkedDomain: v.string(),
    checkedPages: v.array(v.string()),
    internalSummary: v.optional(v.string()),
    multimodalSummary: v.optional(v.string()),
    publicSummary: v.optional(v.string()),
    publicBody: v.optional(v.string()),
    publicObservations: v.optional(v.array(publicObservationValidator)),
    publicOffer: v.optional(publicOfferValidator),
    usedSkills: v.optional(usedSkillsValidator),
    skillSummaries: v.optional(skillSummaryValidator),
  },
  handler: async (ctx, args) => {
    const now = Date.now();
    const lead = await ctx.db.get(args.leadId);
    if (!lead) {
      throw new Error("Lead wurde nicht gefunden.");
    }

    if (args.auditId) {
      const existing = await ctx.db.get(args.auditId);
      if (!existing) {
        throw new Error("Audit wurde nicht gefunden.");
      }

      await ctx.db.patch(args.auditId, {
        checkedDomain: args.checkedDomain,
        checkedPages: args.checkedPages,
        internalSummary: args.internalSummary,
        multimodalSummary: args.multimodalSummary,
        publicSummary: args.publicSummary,
        publicBody: args.publicBody,
        publicObservations: args.publicObservations,
        publicOffer: args.publicOffer,
        usedSkills: args.usedSkills,
        skillSummaries: args.skillSummaries,
        updatedAt: now,
      });

      return args.auditId;
    }

    const safeCheckedDomain = args.checkedDomain.trim().toLowerCase();
    const domainTag = safeCheckedDomain.length > 0
      ? safeCheckedDomain.replace(/[^a-z0-9]+/g, "-").slice(0, 50)
      : "lead";
    let slug = `audit-${domainTag}-${args.leadId}-${now}`;

    const slugCandidates = await ctx.db
      .query("audits")
      .withIndex("by_slug", (q) => q.eq("slug", slug))
      .take(1);

    if (slugCandidates.length > 0) {
      slug = `${slug}-${Math.floor(now / 1_000)}`;
    }

    return await ctx.db.insert("audits", {
      leadId: args.leadId,
      status: "draft",
      slug,
      checkedDomain: args.checkedDomain,
      checkedPages: args.checkedPages,
      internalSummary: args.internalSummary,
      multimodalSummary: args.multimodalSummary,
      publicSummary: args.publicSummary,
      publicBody: args.publicBody,
      publicObservations: args.publicObservations,
      publicOffer: args.publicOffer,
      usedSkills: args.usedSkills,
      skillSummaries: args.skillSummaries,
      createdAt: now,
      updatedAt: now,
    });
  },
});

export const getBySlug = query({
  args: { slug: v.string() },
  handler: async (ctx, args) => {
    await requireOperator(ctx);

    const audits = await ctx.db
      .query("audits")
      .withIndex("by_slug", (q) => q.eq("slug", args.slug))
      .take(1);

    return audits[0] ?? null;
  },
});

export const getPublicBySlug = query({
  args: { slug: v.string() },
  handler: async (ctx: QueryCtx, args) => {
    const audit = await ctx.db
      .query("audits")
      .withIndex("by_slug", (q) => q.eq("slug", args.slug))
      .unique();

    if (!audit) {
      return null;
    }

    if (audit.status === "deactivated") {
      return { publicationStatus: "deactivated" as const };
    }

    if (audit.status !== "published") {
      return { publicationStatus: "draft" as const };
    }

    const lead = await ctx.db.get(audit.leadId);
    const screenshots = await ctx.db
      .query("auditScreenshots")
      .withIndex("by_auditId", (q) => q.eq("auditId", audit._id))
      .order("desc")
      .take(8);

    const publicScreenshots = [];
    for (const screenshot of screenshots) {
      const url = await ctx.storage.getUrl(screenshot.storageId);
      if (!url) {
        continue;
      }

      publicScreenshots.push({
        id: screenshot.storageId,
        url,
        alt: screenshotAlt(screenshot.viewport, screenshot.sourceUrl),
        viewport: screenshot.viewport,
        sourceUrl: screenshot.sourceUrl,
        width: screenshot.width,
        height: screenshot.height,
      });
    }

    return {
      publicationStatus: "published" as const,
      companyName: lead?.companyName ?? audit.checkedDomain,
      domain: audit.checkedDomain,
      publishedAt: toIsoDate(audit.publishedAt, audit.updatedAt),
      publicContent: publicContentForAudit(audit),
      screenshots: publicScreenshots,
    };
  },
});

export const savePublicAuditContent = mutation({
  args: {
    id: v.id("audits"),
    publicSummary: v.optional(v.string()),
    publicBody: v.optional(v.string()),
    publicObservations: v.optional(v.array(publicObservationValidator)),
    publicOffer: v.optional(publicOfferValidator),
  },
  handler: async (ctx, args) => {
    await requireOperator(ctx);
    const audit = await ctx.db.get(args.id);
    if (!audit) {
      throw new Error("Audit wurde nicht gefunden.");
    }

    const now = Date.now();
    await ctx.db.patch(args.id, {
      publicSummary: args.publicSummary,
      publicBody: args.publicBody,
      publicObservations: args.publicObservations,
      publicOffer: args.publicOffer,
      status: audit.status === "published" ? "approved" : audit.status,
      updatedAt: now,
    });

    return args.id;
  },
});

export const publishPublicAudit = mutation({
  args: { id: v.id("audits") },
  handler: async (ctx, args) => {
    await requireOperator(ctx);
    const audit = await ctx.db.get(args.id);
    if (!audit) {
      throw new Error("Audit wurde nicht gefunden.");
    }

    const now = Date.now();
    await ctx.db.patch(args.id, {
      status: "published",
      publishedAt: now,
      reviewDueAt: now + AUDIT_REVIEW_NOTICE_AFTER_MS,
      lifecycleNotificationAt: undefined,
      lifecycleExtendedUntil: undefined,
      deactivatedAt: undefined,
      updatedAt: now,
    });

    return { slug: audit.slug };
  },
});

export const reapprovePublicAudit = mutation({
  args: { id: v.id("audits") },
  handler: async (ctx, args) => {
    await requireOperator(ctx);
    const audit = await ctx.db.get(args.id);
    if (!audit) {
      throw new Error("Audit wurde nicht gefunden.");
    }

    const now = Date.now();
    await ctx.db.patch(args.id, {
      status: "published",
      publishedAt: now,
      reviewDueAt: now + AUDIT_REVIEW_NOTICE_AFTER_MS,
      lifecycleNotificationAt: undefined,
      lifecycleExtendedUntil: undefined,
      deactivatedAt: undefined,
      updatedAt: now,
    });

    return { slug: audit.slug };
  },
});

export const extendPublicAuditLifecycle = mutation({
  args: {
    id: v.id("audits"),
    days: v.number(),
  },
  handler: async (ctx, args) => {
    await requireOperator(ctx);
    const audit = await ctx.db.get(args.id);
    if (!audit) {
      throw new Error("Audit wurde nicht gefunden.");
    }

    const now = Date.now();
    await ctx.db.patch(args.id, {
      status: "published",
      lifecycleExtendedUntil: now + args.days * 24 * 60 * 60 * 1000,
      reviewDueAt: now + args.days * 24 * 60 * 60 * 1000,
      deactivatedAt: undefined,
      updatedAt: now,
    });

    return { slug: audit.slug };
  },
});

export const deactivatePublicAudit = mutation({
  args: { id: v.id("audits") },
  handler: async (ctx, args) => {
    await requireOperator(ctx);
    const audit = await ctx.db.get(args.id);
    if (!audit) {
      throw new Error("Audit wurde nicht gefunden.");
    }

    const now = Date.now();
    await ctx.db.patch(args.id, {
      status: "deactivated",
      deactivatedAt: now,
      updatedAt: now,
    });

    return { slug: audit.slug };
  },
});

export const list = query({
  args: {
    leadId: v.optional(v.id("leads")),
    status: v.optional(auditStatus),
    limit: v.optional(v.number()),
  },
  handler: async (ctx, args) => {
    await requireOperator(ctx);

    const limit = normalizeListLimit(args.limit);

    if (args.leadId) {
      const leadId = args.leadId;

      return await ctx.db
        .query("audits")
        .withIndex("by_leadId", (q) => q.eq("leadId", leadId))
        .order("desc")
        .take(limit);
    }

    if (args.status) {
      const status = args.status;

      return await ctx.db
        .query("audits")
        .withIndex("by_status", (q) => q.eq("status", status))
        .order("desc")
        .take(limit);
    }

    return await ctx.db.query("audits").order("desc").take(limit);
  },
});

export const listDashboardRows = query({
  args: {
    limit: v.optional(v.number()),
  },
  handler: async (ctx: QueryCtx, args): Promise<AuditDashboardRow[]> => {
    await requireOperator(ctx);

    const limit = normalizeListLimit(args.limit);
    const audits = await ctx.db.query("audits").order("desc").take(limit);

    const finalAuditLeadIds = new Set<string>();
    const finalAuditRunIds = new Set<string>();
    const finalAuditIds = new Set<string>();
    const rows: AuditDashboardRow[] = audits.map((audit) => {
      finalAuditLeadIds.add(audit.leadId);
      finalAuditIds.add(audit._id);

      return {
        kind: "audit",
        id: audit._id,
        auditId: audit._id,
        slug: audit.slug,
        title: audit.slug,
        checkedDomain: audit.checkedDomain,
        status: audit.status,
        pageCount: audit.checkedPages.length,
        checkedPages: audit.checkedPages,
        detailHref: `/dashboard/audits/${audit._id}`,
        createdAt: audit.createdAt,
        updatedAt: audit.updatedAt,
      };
    });

    for (const audit of audits) {
      const linkedGenerations = await ctx.db
        .query("auditGenerations")
        .withIndex("by_auditId", (q) => q.eq("auditId", audit._id))
        .take(20);

      for (const generation of linkedGenerations) {
        finalAuditRunIds.add(generation.runId);
      }
    }

    const generationRuns = await ctx.db
      .query("agentRuns")
      .withIndex("by_type", (q) => q.eq("type", "audit_generation"))
      .order("desc")
      .take(limit);

    for (const run of generationRuns) {
      if (!run.leadId) {
        continue;
      }

      const directFinalAudit = run.auditId ? await ctx.db.get(run.auditId) : null;
      const leadFinalAudits = await ctx.db
        .query("audits")
        .withIndex("by_leadId", (q) => q.eq("leadId", run.leadId as Id<"leads">))
        .take(1);

      if (
        finalAuditRunIds.has(run._id) ||
        (run.auditId && finalAuditIds.has(run.auditId)) ||
        directFinalAudit ||
        finalAuditLeadIds.has(run.leadId) ||
        leadFinalAudits.length > 0
      ) {
        continue;
      }

      const stages = await ctx.db
        .query("auditGenerations")
        .withIndex("by_runId", (q) => q.eq("runId", run._id))
        .order("desc")
        .take(20);
      const latestStage = latestGenerationStage(stages);
      const lead = await ctx.db.get(run.leadId);
      const checkedDomain = domainFromLead(lead);

      rows.push({
        kind: "generation",
        id: run._id,
        runId: run._id,
        leadId: run.leadId,
        title: lead?.companyName ?? checkedDomain,
        checkedDomain,
        status: run.status,
        latestStage: latestStage?.stage ?? run.currentStep ?? "audit_generation",
        stageStatus: latestStage?.status ?? run.status,
        errorSummary: run.errorSummary ?? latestStage?.errorSummary ?? null,
        pageCount: 0,
        checkedPages: [],
        createdAt: run.createdAt,
        updatedAt: Math.max(run.updatedAt, latestStage?.updatedAt ?? 0),
      });
    }

    return rows.sort((a, b) => b.updatedAt - a.updatedAt).slice(0, limit);
  },
});