import { PrismaMssql } from "@prisma/adapter-mssql";
import { PrismaPg } from "@prisma/adapter-pg";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";

import { PrismaClient as CwPrismaClient } from "./generated/prisma/client";
import { PrismaClient as ApiPrismaClient } from "../api/generated/prisma/client";

type EnvMap = Record<string, string>;

type Summary = {
  cwTotal: number;
  apiTotal: number;
  eligibleForSync: number;
  missingSrServiceRecId: number;
  missingMemberRecId: number;
  missingParentTicketInApi: number;
  missingAuthorMappingInApi: number;
  eligibleButMissingInApi: number;
  sampleMissingParentTicketIds: number[];
  sampleMissingAuthorMemberRecIds: number[];
  sampleEligibleButMissingNoteIds: number[];
  topMissingAuthorMemberRecIds: Array<{ memberRecId: number; count: number }>;
  topMissingParentTicketIds: Array<{ srServiceRecId: number; count: number }>;
  automateApi: {
    total: number;
    eligibleForSync: number;
    missingSrServiceRecId: number;
    missingMemberRecId: number;
    missingParentTicketInApi: number;
    missingAuthorMappingInApi: number;
    eligibleButMissingInApi: number;
    sampleMemberRecIds: number[];
    sampleNoteIdsMissingInApi: number[];
  };
};

const isAutomateApiAuthor = (
  createdBy: string | null,
  originalAuthor: string | null
): boolean => {
  const normalizedCreatedBy = createdBy?.trim().toLowerCase() ?? "";
  const normalizedOriginalAuthor = originalAuthor?.trim().toLowerCase() ?? "";
  return (
    normalizedCreatedBy.includes("automateapi") ||
    normalizedOriginalAuthor.includes("automateapi")
  );
};

const parseEnvFile = (path: string): EnvMap => {
  const envData = readFileSync(path, "utf8");
  const out: EnvMap = {};

  for (const rawLine of envData.split(/\r?\n/)) {
    const line = rawLine.trim();
    if (!line || line.startsWith("#")) continue;

    const index = line.indexOf("=");
    if (index <= 0) continue;

    const key = line.slice(0, index).trim();
    let value = line.slice(index + 1).trim();

    if (
      (value.startsWith('"') && value.endsWith('"')) ||
      (value.startsWith("'") && value.endsWith("'"))
    ) {
      value = value.slice(1, -1);
    }

    out[key] = value;
  }

  return out;
};

const readApiEnv = (): EnvMap => {
  const candidates = [
    resolve(import.meta.dir, "../api/.env"),
    resolve(process.cwd(), "../api/.env"),
    resolve(process.cwd(), "api/.env"),
  ];

  for (const candidate of candidates) {
    try {
      return parseEnvFile(candidate);
    } catch {
      // Try next
    }
  }

  return {};
};

const main = async (): Promise<void> => {
  const apiEnv = readApiEnv();

  const cwDatabaseUrl =
    process.env.CW_DATABASE_URL ||
    process.env.DATABASE_URL ||
    apiEnv.CW_DATABASE_URL;
  const apiDatabaseUrl =
    process.env.API_DATABASE_URL ||
    process.env.OPTIMA_API_DATABASE_URL ||
    apiEnv.API_DATABASE_URL ||
    apiEnv.OPTIMA_API_DATABASE_URL ||
    apiEnv.DATABASE_URL;

  if (!cwDatabaseUrl) {
    throw new Error("Missing CW DB URL. Set CW_DATABASE_URL or DATABASE_URL.");
  }

  if (!apiDatabaseUrl) {
    throw new Error(
      "Missing API DB URL. Set API_DATABASE_URL/OPTIMA_API_DATABASE_URL or provide api/.env DATABASE_URL."
    );
  }

  const cwPrisma = new CwPrismaClient({
    adapter: new PrismaMssql(cwDatabaseUrl),
  });
  const apiPrisma = new ApiPrismaClient({
    adapter: new PrismaPg({ connectionString: apiDatabaseUrl }),
  });

  try {
    console.log("[diag] Loading API reference sets...");
    const [apiNotes, apiTickets, apiUsers] = await Promise.all([
      apiPrisma.serviceTicketNote.findMany({ select: { id: true } }),
      apiPrisma.serviceTicket.findMany({ select: { id: true } }),
      apiPrisma.user.findMany({ select: { cwMemberId: true } }),
    ]);

    const apiNoteIds = new Set<number>(apiNotes.map((r) => r.id));
    const apiTicketIds = new Set<number>(apiTickets.map((r) => r.id));
    const apiUserMemberIds = new Set<number>(
      apiUsers
        .map((r) => r.cwMemberId)
        .filter((v): v is number => Number.isInteger(v))
    );

    console.log(
      `[diag] API sets: notes=${apiNoteIds.size} tickets=${apiTicketIds.size} usersWithCwMemberId=${apiUserMemberIds.size}`
    );

    const cwTotal = await cwPrisma.ticketNote.count();
    const apiTotal = apiNoteIds.size;

    let missingSrServiceRecId = 0;
    let missingMemberRecId = 0;
    let missingParentTicketInApi = 0;
    let missingAuthorMappingInApi = 0;
    let eligibleForSync = 0;
    let eligibleButMissingInApi = 0;

    let automateTotal = 0;
    let automateEligibleForSync = 0;
    let automateMissingSrServiceRecId = 0;
    let automateMissingMemberRecId = 0;
    let automateMissingParentTicketInApi = 0;
    let automateMissingAuthorMappingInApi = 0;
    let automateEligibleButMissingInApi = 0;

    const sampleMissingParentTicketIds: number[] = [];
    const sampleMissingAuthorMemberRecIds: number[] = [];
    const sampleEligibleButMissingNoteIds: number[] = [];
    const automateSampleMemberRecIds: number[] = [];
    const automateSampleNoteIdsMissingInApi: number[] = [];
    const missingAuthorCounts = new Map<number, number>();
    const missingParentCounts = new Map<number, number>();

    let cursor = 0;
    const batchSize = 5000;

    console.log(
      `[diag] Scanning CW TicketNote rows in batches of ${batchSize}...`
    );

    while (true) {
      const batch = await cwPrisma.ticketNote.findMany({
        where: {
          ticketNoteRecId: {
            gt: cursor,
          },
        },
        orderBy: {
          ticketNoteRecId: "asc",
        },
        select: {
          ticketNoteRecId: true,
          srServiceRecId: true,
          memberRecId: true,
          createdBy: true,
          originalAuthor: true,
        },
        take: batchSize,
      });

      if (batch.length === 0) break;

      for (const row of batch) {
        const noteId = row.ticketNoteRecId;
        const srServiceRecId = row.srServiceRecId;
        const memberRecId = row.memberRecId;
        const isAutomate = isAutomateApiAuthor(
          row.createdBy,
          row.originalAuthor
        );

        if (isAutomate) {
          automateTotal++;
          if (
            memberRecId &&
            automateSampleMemberRecIds.length < 20 &&
            !automateSampleMemberRecIds.includes(memberRecId)
          ) {
            automateSampleMemberRecIds.push(memberRecId);
          }
        }

        let blocked = false;

        if (!srServiceRecId) {
          missingSrServiceRecId++;
          if (isAutomate) {
            automateMissingSrServiceRecId++;
          }
          blocked = true;
        } else if (!apiTicketIds.has(srServiceRecId)) {
          missingParentTicketInApi++;
          if (isAutomate) {
            automateMissingParentTicketInApi++;
          }
          blocked = true;
          missingParentCounts.set(
            srServiceRecId,
            (missingParentCounts.get(srServiceRecId) ?? 0) + 1
          );
          if (sampleMissingParentTicketIds.length < 20) {
            sampleMissingParentTicketIds.push(srServiceRecId);
          }
        }

        if (!memberRecId) {
          missingMemberRecId++;
          if (isAutomate) {
            automateMissingMemberRecId++;
          }
          blocked = true;
        } else if (!apiUserMemberIds.has(memberRecId)) {
          missingAuthorMappingInApi++;
          if (isAutomate) {
            automateMissingAuthorMappingInApi++;
          }
          blocked = true;
          missingAuthorCounts.set(
            memberRecId,
            (missingAuthorCounts.get(memberRecId) ?? 0) + 1
          );
          if (sampleMissingAuthorMemberRecIds.length < 20) {
            sampleMissingAuthorMemberRecIds.push(memberRecId);
          }
        }

        if (!blocked) {
          eligibleForSync++;
          if (isAutomate) {
            automateEligibleForSync++;
          }
          if (!apiNoteIds.has(noteId)) {
            eligibleButMissingInApi++;
            if (isAutomate) {
              automateEligibleButMissingInApi++;
              if (automateSampleNoteIdsMissingInApi.length < 20) {
                automateSampleNoteIdsMissingInApi.push(noteId);
              }
            }
            if (sampleEligibleButMissingNoteIds.length < 50) {
              sampleEligibleButMissingNoteIds.push(noteId);
            }
          }
        }
      }

      cursor = batch[batch.length - 1]!.ticketNoteRecId;
      if (cursor % 50000 < batchSize) {
        console.log(`[diag] Progress cursor=${cursor}`);
      }
    }

    const summary: Summary = {
      cwTotal,
      apiTotal,
      eligibleForSync,
      missingSrServiceRecId,
      missingMemberRecId,
      missingParentTicketInApi,
      missingAuthorMappingInApi,
      eligibleButMissingInApi,
      sampleMissingParentTicketIds,
      sampleMissingAuthorMemberRecIds,
      sampleEligibleButMissingNoteIds,
      topMissingAuthorMemberRecIds: [...missingAuthorCounts.entries()]
        .sort((a, b) => b[1] - a[1])
        .slice(0, 20)
        .map(([memberRecId, count]) => ({ memberRecId, count })),
      topMissingParentTicketIds: [...missingParentCounts.entries()]
        .sort((a, b) => b[1] - a[1])
        .slice(0, 20)
        .map(([srServiceRecId, count]) => ({ srServiceRecId, count })),
      automateApi: {
        total: automateTotal,
        eligibleForSync: automateEligibleForSync,
        missingSrServiceRecId: automateMissingSrServiceRecId,
        missingMemberRecId: automateMissingMemberRecId,
        missingParentTicketInApi: automateMissingParentTicketInApi,
        missingAuthorMappingInApi: automateMissingAuthorMappingInApi,
        eligibleButMissingInApi: automateEligibleButMissingInApi,
        sampleMemberRecIds: automateSampleMemberRecIds,
        sampleNoteIdsMissingInApi: automateSampleNoteIdsMissingInApi,
      },
    };

    console.log("[diag] TicketNote sync gap summary:");
    console.log(JSON.stringify(summary, null, 2));
  } finally {
    await Promise.all([cwPrisma.$disconnect(), apiPrisma.$disconnect()]);
  }
};

main().catch((error) => {
  console.error("[diag] Failed:", error);
  process.exit(1);
});