import { randomUUID } from "node:crypto";
import type { Request, Response } from "express";
import { createProjectDeviceUpdateProjectCommand } from "../../domain/models/project-device-project-command.model.js";
import {
  createProjectDeviceDeleteProjectCommand,
  createProjectDeviceInsertProjectCommand,
  type ProjectDeviceSnapshot,
} from "../../domain/models/project-device-structure-project-command.model.js";
import { projectDeviceSyncService } from "../composition/project-device-sync-service.js";
import { projectCommandService } from "../composition/project-command-stores.js";
import {
  globalDeviceRepository,
  projectDeviceRepository,
} from "../composition/application-repositories.js";
import {
  createProjectDeviceCommandSchema,
  disconnectProjectDeviceRowsSchema,
  projectDeviceStructureCommandSchema,
  synchronizeProjectDeviceRowsSchema,
  updateProjectDeviceCommandSchema,
} from "../../shared/validation/project-device.schemas.js";
import type { CreateProjectDeviceInput } from "../../shared/validation/project-device.schemas.js";
import { respondWithProjectCommandError } from "./project-command.controller.js";

export async function listProjectDevicesByProject(req: Request, res: Response) {
  const { projectId } = req.params;
  if (typeof projectId !== "string") {
    return res.status(400).json({ error: "Invalid projectId" });
  }
  const rows = await projectDeviceRepository.listByProject(projectId);
  return res.json(rows);
}

export async function createProjectDevice(req: Request, res: Response) {
  const { projectId } = req.params;
  if (typeof projectId !== "string") {
    return res.status(400).json({ error: "Invalid projectId" });
  }
  const parsed = createProjectDeviceCommandSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: parsed.error.flatten() });
  }
  const { expectedRevision, ...input } = parsed.data;
  const projectDevice = toProjectDeviceSnapshot(projectId, randomUUID(), input);

  try {
    const result = projectCommandService.executeUser({
      projectId,
      expectedRevision,
      description: "Projektgerät anlegen",
      command: createProjectDeviceInsertProjectCommand(projectDevice),
    });
    const created = await projectDeviceRepository.findById(projectId, projectDevice.id);
    if (!created) {
      throw new Error("Created project device could not be loaded.");
    }
    return res.status(201).json({ ...result, projectDevice: created });
  } catch (error) {
    return respondWithProjectCommandError(error, res);
  }
}

export async function updateProjectDevice(req: Request, res: Response) {
  const { projectId, projectDeviceId } = req.params;
  if (typeof projectId !== "string" || typeof projectDeviceId !== "string") {
    return res.status(400).json({ error: "Invalid parameters" });
  }

  const parsed = updateProjectDeviceCommandSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: parsed.error.flatten() });
  }
  const { expectedRevision, ...input } = parsed.data;

  try {
    const result = projectCommandService.executeUser({
      projectId,
      expectedRevision,
      description: "Projektgerät bearbeiten",
      command: createProjectDeviceUpdateProjectCommand(
        projectDeviceId,
        toProjectDeviceValues(input)
      ),
    });
    // Linked rows are synchronized only through the explicit review flow.
    // Updating a project device must never silently overwrite local circuit-list values.
    const projectDevice = await projectDeviceRepository.findById(projectId, projectDeviceId);
    if (!projectDevice) {
      throw new Error("Updated project device could not be loaded.");
    }
    return res.json({ ...result, projectDevice });
  } catch (error) {
    return respondWithProjectCommandError(error, res);
  }
}

export async function deleteProjectDevice(req: Request, res: Response) {
  const { projectId, projectDeviceId } = req.params;
  if (typeof projectId !== "string" || typeof projectDeviceId !== "string") {
    return res.status(400).json({ error: "Invalid parameters" });
  }

  const parsed = projectDeviceStructureCommandSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: parsed.error.flatten() });
  }

  try {
    return res.json(
      projectCommandService.executeUser({
        projectId,
        expectedRevision: parsed.data.expectedRevision,
        description: "Projektgerät löschen",
        command: createProjectDeviceDeleteProjectCommand(projectDeviceId, projectId),
      })
    );
  } catch (error) {
    return respondWithProjectCommandError(error, res);
  }
}

export async function copyGlobalDeviceToProject(req: Request, res: Response) {
  const { projectId, globalDeviceId } = req.params;
  if (typeof projectId !== "string" || typeof globalDeviceId !== "string") {
    return res.status(400).json({ error: "Invalid parameters" });
  }
  const parsed = projectDeviceStructureCommandSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: parsed.error.flatten() });
  }

  const source = await globalDeviceRepository.findById(globalDeviceId);
  if (!source) {
    return res.status(404).json({ error: "Global device not found" });
  }

  const projectDevice = toProjectDeviceSnapshot(projectId, randomUUID(), {
    name: source.name,
    displayName: source.displayName,
    phaseType: source.phaseCount === 3 ? "three_phase" : "single_phase",
    category: source.category ?? undefined,
    quantity: source.quantity,
    powerPerUnit: source.installedPowerPerUnitKw,
    simultaneityFactor: source.demandFactor,
    cosPhi: source.powerFactor ?? undefined,
    remark: source.note ?? undefined,
    voltageV: source.voltageV ?? undefined,
  });

  try {
    const result = projectCommandService.executeUser({
      projectId,
      expectedRevision: parsed.data.expectedRevision,
      description: "Globales Gerät ins Projekt übernehmen",
      command: createProjectDeviceInsertProjectCommand(projectDevice),
    });
    const created = await projectDeviceRepository.findById(projectId, projectDevice.id);
    if (!created) {
      throw new Error("Imported project device could not be loaded.");
    }
    return res.status(201).json({ ...result, projectDevice: created });
  } catch (error) {
    return respondWithProjectCommandError(error, res);
  }
}

function toProjectDeviceSnapshot(
  projectId: string,
  id: string,
  input: CreateProjectDeviceInput
): ProjectDeviceSnapshot {
  return {
    id,
    projectId,
    ...toProjectDeviceValues(input),
  };
}

function toProjectDeviceValues(input: CreateProjectDeviceInput) {
  return {
    name: input.name,
    displayName: input.displayName,
    phaseType: input.phaseType,
    connectionKind: input.connectionKind ?? null,
    costGroup: input.costGroup ?? null,
    category: input.category ?? null,
    quantity: input.quantity,
    powerPerUnit: input.powerPerUnit,
    simultaneityFactor: input.simultaneityFactor,
    cosPhi: input.cosPhi ?? null,
    remark: input.remark ?? null,
    voltageV: input.voltageV ?? null,
  };
}

export async function getProjectDeviceSyncPreview(req: Request, res: Response) {
  const { projectId, projectDeviceId } = req.params;
  if (typeof projectId !== "string" || typeof projectDeviceId !== "string") {
    return res.status(400).json({ error: "Invalid parameters" });
  }
  try {
    const preview = await projectDeviceSyncService.getPreview(projectId, projectDeviceId);
    return res.json(preview);
  } catch (error) {
    return res.status(400).json({ error: error instanceof Error ? error.message : "Failed to load sync preview." });
  }
}

export async function synchronizeProjectDeviceRows(req: Request, res: Response) {
  const { projectId, projectDeviceId } = req.params;
  if (typeof projectId !== "string" || typeof projectDeviceId !== "string") {
    return res.status(400).json({ error: "Invalid parameters" });
  }
  const parsed = synchronizeProjectDeviceRowsSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: parsed.error.flatten() });
  }
  try {
    const command = await projectDeviceSyncService.createSynchronizeCommand(
      projectId,
      projectDeviceId,
      parsed.data.rowIds,
      parsed.data.fields
    );
    const result = projectCommandService.executeUser({
      projectId,
      expectedRevision: parsed.data.expectedRevision,
      description: "Projektgerät in Stromkreiszeilen synchronisieren",
      command,
    });
    const preview = await projectDeviceSyncService.getPreview(
      projectId,
      projectDeviceId
    );
    return res.json({ ...result, preview });
  } catch (error) {
    return respondWithProjectCommandError(error, res);
  }
}

export async function disconnectProjectDeviceRows(req: Request, res: Response) {
  const { projectId, projectDeviceId } = req.params;
  if (typeof projectId !== "string" || typeof projectDeviceId !== "string") {
    return res.status(400).json({ error: "Invalid parameters" });
  }
  const parsed = disconnectProjectDeviceRowsSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: parsed.error.flatten() });
  }
  try {
    const command = await projectDeviceSyncService.createDisconnectCommand(
      projectId,
      projectDeviceId,
      parsed.data.rowIds
    );
    const result = projectCommandService.executeUser({
      projectId,
      expectedRevision: parsed.data.expectedRevision,
      description: "Projektgerät-Verknüpfungen trennen",
      command,
    });
    const preview = await projectDeviceSyncService.getPreview(
      projectId,
      projectDeviceId
    );
    return res.json({ ...result, preview });
  } catch (error) {
    return respondWithProjectCommandError(error, res);
  }
}