import {
  CountType,
  FlowUnits,
  InitHydOption,
  LinkProperty,
  LinkType,
  NodeProperty,
  Option,
  Project,
  TimeParameter,
  Workspace,
} from 'epanet-js';
import type { SimulationResult, NodeResult, LinkResult, PumpEnergyResult, PumpEnergySummary, QualityInfo } from './types';

import { computePumpEnergy } from './resultPostProcess';

// @ts-ignore
import { EpanetEngine } from 'epanet-js/engines/v2.3.5';

self.onmessage = async (e: MessageEvent<{ id: string; fileStr: string }>) => {
  const { id, fileStr } = e.data;
  try {
    const workspace = new Workspace();
    await workspace.loadModuleVersion(() => EpanetEngine());

    if (workspace.version !== 20305) {
      throw new Error(`EPANET 2.3.5가 필요합니다. 로드된 버전: ${workspace.version}`);
    }

    workspace.writeFile('network.inp', fileStr);
    const project = new Project(workspace);
    let networkOpened = false;
    let hydraulicsOpened = false;

    try {
      // Mark opened first: a failed open still holds the files, so close() must run.
      networkOpened = true;
      project.open('network.inp', 'report.rpt', 'output.out');

      const nodeCount = project.getCount(CountType.NodeCount);
      const linkCount = project.getCount(CountType.LinkCount);

      // 1. Collect node metadata
      const nodes: Record<string, NodeResult> = {};
      const nodeIndexToId: Record<number, string> = {};

      for (let index = 1; index <= nodeCount; index += 1) {
        const nodeId = project.getNodeId(index);
        nodeIndexToId[index] = nodeId;
        let coordinates: { x: number; y: number } | null = null;
        try {
          coordinates = project.getCoordinates(index);
        } catch {
          coordinates = null;
        }

        nodes[nodeId] = {
          id: nodeId,
          type: project.getNodeType(index),
          coordinates,
          demand: 0,
          head: 0,
          pressure: 0,
        };
      }

      // 2. Collect link metadata
      const links: Record<string, LinkResult> = {};
      const linkIndexToId: Record<number, string> = {};

      for (let index = 1; index <= linkCount; index += 1) {
        const linkId = project.getLinkId(index);
        linkIndexToId[index] = linkId;
        const { node1, node2 } = project.getLinkNodes(index);
        const vertices: Array<{ x: number; y: number }> = [];

        for (
          let vertexIndex = 1;
          vertexIndex <= project.getVertexCount(index);
          vertexIndex += 1
        ) {
          vertices.push(project.getVertex(index, vertexIndex));
        }

        links[linkId] = {
          id: linkId,
          type: project.getLinkType(index),
          fromNode: project.getNodeId(node1),
          toNode: project.getNodeId(node2),
          vertices,
          flow: 0,
          velocity: 0,
          headloss: 0,
        };
      }

      // 3. Open hydraulics and run full EPS loop (Save hydraulics for water quality)
      project.openH();
      hydraulicsOpened = true;
      project.initH(InitHydOption.Save);

      const timeSteps: number[] = [];
      const nodeSeries: Record<string, { demand: number[]; head: number[]; pressure: number[]; quality: number[] }> = {};
      const linkSeries: Record<string, { flow: number[]; velocity: number[]; headloss: number[]; quality: number[]; energy: number[]; efficiency: number[] }> = {};

      for (const nid of Object.keys(nodes)) {
        nodeSeries[nid] = { demand: [], head: [], pressure: [], quality: [] };
      }
      for (const lid of Object.keys(links)) {
        linkSeries[lid] = { flow: [], velocity: [], headloss: [], quality: [], energy: [], efficiency: [] };
      }

      // epanet-js reports EN_runH warning codes (1-6) only via console.warn;
      // capture them so they count even under [REPORT] MESSAGES NO.
      const engineWarnings: Array<{ time: number; code: number }> = [];
      const pendingWarningCodes: number[] = [];
      const originalWarn = console.warn;
      console.warn = (...args: unknown[]) => {
        const match = /Warning (\d+)/.exec(String(args[0] ?? ''));
        if (match) pendingWarningCodes.push(Number(match[1]));
        originalWarn(...args);
      };

      let tstep = 1;
      try {
      while (tstep > 0) {
        const currentTime = project.runH();
        timeSteps.push(currentTime);
        for (const code of pendingWarningCodes.splice(0)) {
          engineWarnings.push({ time: currentTime, code });
        }

        // Bulk reads: one engine call per property instead of one per element.
        const demands = project.getNodeValues(NodeProperty.Demand);
        const heads = project.getNodeValues(NodeProperty.Head);
        const pressures = project.getNodeValues(NodeProperty.Pressure);
        for (let index = 1; index <= nodeCount; index += 1) {
          const nid = nodeIndexToId[index];
          nodeSeries[nid].demand.push(demands[index - 1]);
          nodeSeries[nid].head.push(heads[index - 1]);
          nodeSeries[nid].pressure.push(pressures[index - 1]);
        }

        const flows = project.getLinkValues(LinkProperty.Flow);
        const velocities = project.getLinkValues(LinkProperty.Velocity);
        const headlosses = project.getLinkValues(LinkProperty.Headloss);
        for (let index = 1; index <= linkCount; index += 1) {
          const lid = linkIndexToId[index];
          linkSeries[lid].flow.push(flows[index - 1]);
          linkSeries[lid].velocity.push(velocities[index - 1]);
          linkSeries[lid].headloss.push(headlosses[index - 1]);

          if (links[lid].type === LinkType.Pump) {
            const eKw = project.getLinkValue(index, LinkProperty.Energy);
            const effRatio = project.getLinkValue(index, LinkProperty.PumpEffic);
            linkSeries[lid].energy.push(Math.round(eKw * 100) / 100);
            linkSeries[lid].efficiency.push(Math.round(effRatio * 1000) / 10);
          }
        }
        tstep = project.nextH();
      }
      } finally {
        console.warn = originalWarn;
      }

      // Close hydraulics before water quality simulation
      if (hydraulicsOpened) {
        try {
          project.closeH();
          hydraulicsOpened = false;
        } catch {
          // ignore
        }
      }

      // 4. Check and run Water Quality Simulation (Chemical decay, Water Age, Tracer)
      let qualityInfo: QualityInfo | undefined = undefined;
      let qualityOpened = false;
      let qualityFailed = false;
      let qualityErrorMessage: string | undefined = undefined;
      try {
        const qInfo = project.getQualityInfo();
        if (qInfo && qInfo.qualType > 0) {
          const typeNames = ['NONE', 'CHEMICAL', 'AGE', 'TRACE'] as const;
          const qTypeIdx = qInfo.qualType as number;
          qualityInfo = {
            qualType: qTypeIdx,
            typeName: typeNames[qTypeIdx] ?? 'CHEMICAL',
            chemName: qInfo.chemName || (qTypeIdx === 2 ? 'Age' : 'Quality'),
            chemUnits: qInfo.chemUnits || (qTypeIdx === 2 ? 'hours' : 'mg/L'),
            traceNode: qInfo.traceNode > 0 ? (nodeIndexToId[qInfo.traceNode] ?? '') : undefined,
            status: 'success',
          };

          project.openQ();
          qualityOpened = true;
          project.initQ(InitHydOption.NoSave);

          let tstepQ = 1;
          while (tstepQ > 0) {
            project.runQ();
            for (let index = 1; index <= nodeCount; index += 1) {
              const nid = nodeIndexToId[index];
              const qv = project.getNodeValue(index, NodeProperty.Quality);
              nodeSeries[nid].quality.push(Math.round(qv * 10000) / 10000);
            }

            for (let index = 1; index <= linkCount; index += 1) {
              const lid = linkIndexToId[index];
              const lqv = project.getLinkValue(index, LinkProperty.LinkQual);
              linkSeries[lid].quality.push(Math.round(lqv * 10000) / 10000);
            }
            tstepQ = project.nextQ();
          }
        }
      } catch (err: unknown) {
        qualityFailed = true;
        qualityErrorMessage = err instanceof Error ? err.message : String(err);
        if (qualityInfo) {
          qualityInfo.status = 'failed';
          qualityInfo.errorMessage = qualityErrorMessage;
        }
      } finally {
        if (qualityOpened) {
          try {
            project.closeQ();
          } catch {
            // ignore
          }
        }
      }

      // Assign initial values (t=0) and full timeSeries
      const numSteps = timeSteps.length;
      const hasValidQuality = qualityInfo && qualityInfo.status === 'success' && !qualityFailed;

      for (const nid of Object.keys(nodes)) {
        if (!hasValidQuality || nodeSeries[nid].quality.length !== numSteps) {
          nodeSeries[nid].quality = [];
        }
        nodes[nid].demand = nodeSeries[nid].demand[0] ?? 0;
        nodes[nid].head = nodeSeries[nid].head[0] ?? 0;
        nodes[nid].pressure = nodeSeries[nid].pressure[0] ?? 0;
        nodes[nid].quality = hasValidQuality ? (nodeSeries[nid].quality[0] ?? 0) : undefined;
        nodes[nid].timeSeries = nodeSeries[nid];
      }

      for (const lid of Object.keys(links)) {
        if (!hasValidQuality || linkSeries[lid].quality.length !== numSteps) {
          linkSeries[lid].quality = [];
        }
        links[lid].flow = linkSeries[lid].flow[0] ?? 0;
        links[lid].velocity = linkSeries[lid].velocity[0] ?? 0;
        links[lid].headloss = linkSeries[lid].headloss[0] ?? 0;
        links[lid].quality = hasValidQuality ? (linkSeries[lid].quality[0] ?? 0) : undefined;
        links[lid].timeSeries = linkSeries[lid];
      }


      // 5. Pump energy metrics (shared definitions: resultPostProcess.ts)
      const pumpSeries: Record<string, { energy: number[]; efficiency: number[] }> = {};
      for (const lid of Object.keys(links)) {
        if (links[lid].type === LinkType.Pump) pumpSeries[lid] = linkSeries[lid];
      }
      const { perPump, summary: energySummary } = computePumpEnergy(timeSteps, pumpSeries, links);
      for (const [lid, metrics] of Object.entries(perPump)) {
        links[lid].energy = linkSeries[lid].energy[0] ?? 0;
        links[lid].efficiency = linkSeries[lid].efficiency[0] ?? 0;
        links[lid].totalKwh = metrics.totalKwh;
        links[lid].peakKw = metrics.peakKw;
        links[lid].avgKw = metrics.avgKw;
        links[lid].utilization = metrics.utilization;
      }
      const flowUnitIndex = project.getFlowUnits();
      const reportStart = project.getTimeParameter(TimeParameter.ReportStart);
      const reportStep = project.getTimeParameter(TimeParameter.ReportStep);
      const pressureUnitIndex = project.getOption(25 as Option);
      const pressureUnitNames = ['psi', 'kPa', 'm', 'bar', 'ft'];

      // Close project to flush report
      if (hydraulicsOpened) {
        try {
          project.closeH();
          hydraulicsOpened = false;
        } catch {
          // ignore
        }
      }
      if (networkOpened) {
        try {
          project.close();
          networkOpened = false;
        } catch {
          // ignore
        }
      }

      let reportText = '';
      try {
        reportText = workspace.readFile('report.rpt');
      } catch {
        reportText = '';
      }

      const result: SimulationResult = {
        engine: { runtime: 'wasm', version: '2.3.5' },
        timeSeconds: timeSteps[0] ?? 0,
        timeSteps,
        units: {
          flow: FlowUnits[flowUnitIndex] ?? 'Unknown',
          pressure: pressureUnitNames[pressureUnitIndex] ?? 'Unknown',
        },
        nodes,
        links,
        reportText,
        qualityInfo,
        energySummary,
        engineWarnings,
        reportStart,
        reportStep,
      };

      self.postMessage({ id, result });
    } finally {
      if (hydraulicsOpened) {
        try {
          project.closeH();
        } catch {
          // ignore
        }
      }
      if (networkOpened) {
        try {
          project.close();
        } catch {
          // ignore
        }
      }
    }
  } catch (error: unknown) {
    const message = error instanceof Error ? error.message : String(error);
    self.postMessage({ id, error: message });
  }
};