import {
  BadRequestException,
  Body,
  Controller,
  Get,
  NotFoundException,
  Param,
  Post,
} from '@nestjs/common';
import {
  ApiOperation,
  ApiProperty,
  ApiResponse,
  ApiTags,
} from '@nestjs/swagger';
import { BROADCAST_ADDR } from './codec.js';
import { MeshService } from './mesh.service.js';

export class SendTextDto {
  @ApiProperty({ description: 'Message text', example: 'hello' })
  text!: string;
  @ApiProperty({
    required: false,
    description:
      'Decimal node number, "!b", or "broadcast" (defaults to broadcast)',
    example: '!b',
  })
  to?: string | number;
}

// tag description is set via DocumentBuilder.addTag in main.ts (v12 ApiTagOptions has no description)
@ApiTags('Mesh')
@Controller()
export class MeshController {
  constructor(private readonly mesh: MeshService) {}

  @Get('status')
  @ApiOperation({
    summary: 'Bridge connection status',
    description:
      'Whether the bot is connected to the meshtastic-serial-bridge and which node number this device has.',
  })
  @ApiResponse({
    status: 200,
    description: 'Connection status',
    example: {
      connected: true,
      myNodeNum: 123456789,
      host: '192.168.1.4',
      port: 4403,
    },
  })
  status() {
    return this.mesh.status();
  }

  @Post('send')
  @ApiOperation({
    summary: 'Send a text message over the mesh',
    description:
      'Queues a TEXT_MESSAGE_APP packet on the pinned test channel (index 2, "testowy" — never the primary channel). Returns the Meshtastic packet id.',
  })
  @ApiResponse({
    status: 200,
    description: 'Packet queued',
    example: { id: 123456789 },
  })
  @ApiResponse({ status: 400, description: 'Invalid text or target' })
  @ApiResponse({ status: 503, description: 'Bridge not connected' })
  async send(@Body() body: SendTextDto) {
    if (typeof body?.text !== 'string' || body.text.length === 0) {
      throw new BadRequestException('text must be a non-empty string');
    }
    let to = BROADCAST_ADDR;
    const t = body.to;
    if (t !== undefined && t !== '!b' && t !== 'broadcast') {
      const n = typeof t === 'number' ? t : Number(String(t));
      if (!Number.isFinite(n))
        throw new BadRequestException(
          'to must be a decimal node number, "!b", or "broadcast"',
        );
      to = n;
    }
    return { id: await this.mesh.sendText(to, body.text) };
  }

  @Get('channels')
  @ApiOperation({
    summary: "The device's Meshtastic channels (keys redacted)",
    description:
      'Channel table streamed during the initial sync; empty until it completes. psk/keys are never exposed.',
  })
  @ApiResponse({
    status: 200,
    description: 'Channels sorted by index',
    example: [
      { index: 0, name: 'Default', uplinkEnabled: true, downlinkEnabled: true },
      {
        index: 2,
        name: 'testowy',
        uplinkEnabled: false,
        downlinkEnabled: false,
      },
    ],
  })
  channels() {
    return this.mesh.channels();
  }

  @Get('messages')
  @ApiOperation({
    summary: 'Message history (last 100)',
    description:
      'Inbound text messages and our sends, newest first. tx records start "pending" and move to "delivered"/"failed" when the routing ACK/NACK arrives; broadcasts stay "pending" because firmware strips want_ack before TX. History is in-memory only (last 100) and resets on every bridge reconnect.',
  })
  @ApiResponse({
    status: 200,
    description: 'Messages newest first',
    example: [
      {
        id: 456789,
        dir: 'tx',
        to: 42,
        text: 'hello testowy',
        channel: 2,
        at: 1758000123456,
        status: 'delivered',
      },
      {
        id: 123456,
        dir: 'rx',
        from: 987654321,
        text: 'ping',
        channel: 2,
        at: 1758000000000,
      },
    ],
  })
  messages() {
    return this.mesh.messages();
  }

  @Get('nodes')
  @ApiOperation({
    summary: 'Known mesh nodes (lean summaries)',
    description:
      'Node database collected during the initial sync plus live POSITION_APP updates; reset on every bridge reconnect. Names, hwModel and batteryLevel appear only when the device reported them.',
  })
  @ApiResponse({
    status: 200,
    description: 'Nodes sorted by node number',
    example: [
      {
        num: 123456789,
        longName: 'Kamil SP8MK/P',
        shortName: 'KK',
        hwModel: 'TBEAM',
        batteryLevel: 87,
        lastHeard: 1758000000,
        position: { lat: 52.1049637, lon: 20.9833152, alt: 123 },
      },
    ],
  })
  async nodes() {
    return this.mesh.nodes();
  }

  @Get('nodes/:id')
  @ApiOperation({
    summary: 'Look up one node by number or name',
    description:
      'Exact node number first (numbers and numeric strings), then case-insensitive exact long/short name, else the unique case-insensitive substring match across names. 404 when nothing or more than one node matches.',
  })
  @ApiResponse({
    status: 200,
    description: 'The matching node',
    example: {
      num: 123456789,
      longName: 'Kamil SP8MK/P',
      shortName: 'KK',
      lastHeard: null,
    },
  })
  @ApiResponse({
    status: 404,
    description: 'No node (or more than one) matching the given id or name',
  })
  async node(@Param('id') id: string) {
    const n = await this.mesh.node(id);
    if (!n) throw new NotFoundException(`no node matching '${id}'`);
    return n;
  }
}