import { describe, expect, it } from 'vitest';
import { planSkirting } from '../src/lib/skirting';
import { skirtingCuts } from '../src/lib/cut-list';
import type { Room, SkirtingSettings } from '../src/lib/types';

const settings: SkirtingSettings = { stockLengths: [2400], thickness: 18, minLength: 300, kerf: 3 };
const rectangle = (width = 4000, height = 3000, id = 'r1'): Room => ({
  id,
  name: id,
  direction: 0,
  walls: [width, height, width, height].map((length, index) => ({
    id: `w${index}`,
    length,
    turn: 90,
    doors: [],
  })),
});

describe('skirting cutting plan', () => {
  it('subtracts internal butt thickness and preserves every installed wall run', () => {
    const plan = planSkirting([rectangle()], settings, 5);
    expect(plan.issues.filter((issue) => issue.severity === 'error')).toEqual([]);
    expect(plan.pieces.reduce((sum, piece) => sum + piece.backLength, 0)).toBeCloseTo(
      14_000 - 4 * 18,
    );
    expect(plan.pieces.every((piece) => piece.length >= settings.minLength)).toBe(true);
    expect(skirtingCuts(plan)[0].id).toBe('A1');
    for (let wall = 0; wall < 4; wall++) {
      const pieces = plan.pieces.filter((piece) => piece.wallIndex === wall);
      expect(pieces[0].leftType).toBe('internal');
      expect(pieces.at(-1)?.rightType).toBe('internal');
      expect(
        pieces.every(
          (piece) => Math.abs(piece.leftMitre) < 1e-6 && Math.abs(piece.rightMitre) < 1e-6,
        ),
      ).toBe(true);
    }
  });

  it('removes doors and cuts square at each opening', () => {
    const room = rectangle();
    room.walls[0].doors = [{ id: 'd1', offset: 1000, width: 900 }];
    const plan = planSkirting([room], settings, 5);
    const pieces = plan.pieces.filter((piece) => piece.wallIndex === 0);
    expect(pieces.reduce((sum, piece) => sum + piece.backLength, 0)).toBeCloseTo(4000 - 900 - 18);
    expect(
      pieces.some((piece) => Math.abs(piece.end.x - 1000) < 1e-6 && piece.rightType === 'square'),
    ).toBe(true);
    expect(
      pieces.some((piece) => Math.abs(piece.start.x - 1900) < 1e-6 && piece.leftType === 'square'),
    ).toBe(true);
    expect(
      pieces.every((piece) => piece.end.x <= 1000 + 1e-6 || piece.start.x >= 1900 - 1e-6),
    ).toBe(true);
  });

  it('does not silently produce undersized pieces next to doors', () => {
    const room = rectangle();
    room.walls[0].doors = [{ id: 'd1', offset: 200, width: 900 }];
    const plan = planSkirting([room], settings, 5);
    expect(plan.pieces).toEqual([]);
    expect(
      plan.issues.some((issue) => issue.severity === 'error' && issue.message.includes('minimum')),
    ).toBe(true);
  });

  it('rejects crossing angled end cuts even when the back length meets the minimum', () => {
    const room: Room = {
      id: 'acute',
      name: 'Acute corner',
      direction: 0,
      walls: [1000, 1000, 2000 * Math.sin((5 * Math.PI) / 180)].map((length, index) => ({
        id: `w${index}`,
        length,
        turn: [170, 95, 95][index],
        doors: index === 1 ? [{ id: 'd1', offset: 200, width: 300 }] : [],
      })),
    };
    const plan = planSkirting([room], { ...settings, minLength: 50 }, 5);
    expect(plan.pieces).toEqual([]);
    expect(
      plan.issues.some((issue) => issue.message.includes('shorter than the 50 mm minimum')),
    ).toBe(true);
  });

  it('extends the long point at external fireplace corners and specifies 45° mitres', () => {
    const room: Room = {
      id: 'r1',
      name: 'Fireplace',
      direction: 0,
      walls: [5000, 4000, 2000, 600, 1000, 600, 2000, 4000].map((length, index) => ({
        id: `w${index}`,
        length,
        turn: [90, 90, 90, -90, -90, 90, 90, 90][index],
        doors: [],
      })),
    };
    const plan = planSkirting([room], { ...settings, stockLengths: [6000] }, 5);
    expect(plan.issues.filter((issue) => issue.severity === 'error')).toEqual([]);
    const front = plan.pieces.find((piece) => piece.wallIndex === 4)!;
    expect(front.backLength).toBeCloseTo(1000);
    expect(front.length).toBeCloseTo(1036);
    expect(front.leftMitre).toBeCloseTo(45);
    expect(front.rightMitre).toBeCloseTo(45);
    expect(front.leftType).toBe('external');
    expect(front.leftBevel).toBeCloseTo(-45);
    expect(front.rightBevel).toBeCloseTo(45);
    expect(front.template?.map((point) => Math.round(point.x))).toEqual([18, 1018, 1036, 0]);
    const reversed = { ...room, walls: room.walls.map((wall) => ({ ...wall, turn: -wall.turn })) };
    const reversePlan = planSkirting([reversed], { ...settings, stockLengths: [6000] }, 5);
    const reverseFront = reversePlan.pieces.find((piece) => piece.wallIndex === 4)!;
    expect(reverseFront.length).toBeCloseTo(1036);
    expect(reverseFront.leftBevel).toBeCloseTo(-45);
    expect(reverseFront.rightBevel).toBeCloseTo(45);
  });

  it('packs across rooms with deterministic unique IDs and accounts for kerf', () => {
    const rooms = [rectangle(1800, 1800, 'r1'), rectangle(1800, 1800, 'r2')];
    const options = { ...settings, stockLengths: [1800, 3600], thickness: 0, kerf: 3 };
    const plan = planSkirting(rooms, options, 5);
    expect(plan).toEqual(planSkirting(rooms, options, 5));
    expect(new Set(plan.pieces.map((piece) => piece.id)).size).toBe(plan.pieces.length);
    expect(plan.pieces.every((piece) => piece.id.startsWith('SU'))).toBe(true);
    expect(plan.stockCount).toBe(8);
    expect(plan.cuts).toBe(0);
    expect(plan.waste).toBeCloseTo(0);
    const trimmed = planSkirting(
      [rectangle(1199, 1199)],
      { ...settings, stockLengths: [2400], thickness: 0, minLength: 1199 },
      5,
    );
    expect(trimmed.stockCount).toBe(4); // 1199 + 3 + 1199 cannot fit into 2400.
    expect(trimmed.cuts).toBe(4);
    for (const stock of trimmed.stocks) expect(stock.used + stock.waste).toBeCloseTo(stock.length);
  });

  it('allows the final saw pass to extend beyond a short stock tail', () => {
    const plan = planSkirting(
      [rectangle(1199, 1199)],
      { ...settings, stockLengths: [1200], thickness: 0 },
      5,
    );
    expect(plan.pieces).toHaveLength(4);
    expect(plan.stockCount).toBe(4);
    expect(plan.waste).toBeCloseTo(4);
    expect(plan.cuts).toBe(4);
  });

  it('looks ahead when choosing from different stock lengths', () => {
    const plan = planSkirting(
      [rectangle(1200, 1200)],
      { ...settings, stockLengths: [1800, 2400], thickness: 0, kerf: 0 },
      5,
    );
    expect(plan.stockCount).toBe(2);
    expect(plan.stocks.every((stock) => stock.length === 2400)).toBe(true);
    expect(plan.waste).toBeCloseTo(0);
  });

  it('lets reused tails set wall joints to save a stock length without extra saw cuts', () => {
    const room = rectangle(4000, 4000);
    const plan = planSkirting([room], settings, 5);
    expect(plan).toEqual(planSkirting([room], settings, 5));
    expect(plan.stockCount).toBe(7); // Fixed joints used eight lengths for this simple square.
    expect(plan.cuts).toBe(4);
    expect(plan.waste).toBeCloseTo(7 * 2400 - (16000 - 4 * 18));
    expect(plan.pieces.some((piece) => Math.abs(piece.length - 815) < 1e-6)).toBe(true);
    for (let wallIndex = 0; wallIndex < 4; wallIndex++) {
      const pieces = plan.pieces.filter((piece) => piece.wallIndex === wallIndex);
      expect(pieces.reduce((sum, piece) => sum + piece.backLength, 0)).toBeCloseTo(3982);
      pieces.slice(1).forEach((piece, index) => {
        expect(piece.start.x).toBeCloseTo(pieces[index].end.x);
        expect(piece.start.y).toBeCloseTo(pieces[index].end.y);
      });
    }
    for (const stock of plan.stocks) {
      let available = stock.length;
      for (const id of stock.pieceIds) {
        const piece = plan.pieces.find((piece) => piece.id === id)!;
        expect(piece.length).toBeLessThanOrEqual(available + 1e-6);
        expect(piece.backLength).toBeGreaterThanOrEqual(settings.minLength - 1e-6);
        available = Math.max(0, available - piece.length - settings.kerf);
      }
    }
  });

  it('reserves the shorter front edge when splitting a run at angled internal corners', () => {
    const room: Room = {
      id: 'triangle',
      name: 'Triangle',
      direction: 0,
      walls: [0, 1, 2].map((index) => ({
        id: `w${index}`,
        length: 3100,
        turn: 120,
        doors: [],
      })),
    };
    const plan = planSkirting([room], { ...settings, stockLengths: [311] }, 5);
    expect(plan.issues.filter((issue) => issue.severity === 'error')).toEqual([]);
    expect(plan.pieces).toHaveLength(30);
    for (const piece of plan.pieces) {
      expect(piece.length).toBeLessThanOrEqual(311 + 1e-6);
      expect(piece.backLength).toBeGreaterThanOrEqual(300 - 1e-6);
      expect(piece.template![2].x - piece.template![3].x).toBeGreaterThanOrEqual(300 - 1e-6);
    }
    for (let wallIndex = 0; wallIndex < 3; wallIndex++) {
      expect(
        plan.pieces
          .filter((piece) => piece.wallIndex === wallIndex)
          .reduce((sum, piece) => sum + piece.backLength, 0),
      ).toBeCloseTo(3100 - 18 / Math.sin((120 * Math.PI) / 180));
    }
  });

  it('calculates angled butt cuts and back setbacks for non-square internal corners', () => {
    const room: Room = {
      id: 'triangle',
      name: 'Triangle',
      direction: 0,
      walls: [0, 1, 2].map((index) => ({
        id: `w${index}`,
        length: 3000,
        turn: 120,
        doors: [],
      })),
    };
    const plan = planSkirting([room], { ...settings, stockLengths: [4000] }, 5);
    expect(plan.pieces).toHaveLength(3);
    expect(plan.pieces[0].backLength).toBeCloseTo(3000 - 18 / Math.sin((120 * Math.PI) / 180));
    for (const piece of plan.pieces) {
      expect(piece.leftMitre).toBeCloseTo(30);
      expect(piece.rightMitre).toBeCloseTo(30);
      expect(piece.leftType).toBe('internal');
      expect(piece.leftBevel).toBeCloseTo(30);
      expect(piece.rightBevel).toBeCloseTo(-30);
      expect(piece.template![2].x - piece.template![3].x).toBeGreaterThan(settings.minLength);
    }
    expect(plan.cuts).toBe(9); // Three blank crosscuts and six end bevels.
  });

  it('can leave a minimum-sized final piece without making a tiny join', () => {
    const plan = planSkirting([rectangle(2500, 2000)], { ...settings, thickness: 0 }, 5);
    expect(plan.issues.filter((issue) => issue.severity === 'error')).toEqual([]);
    expect(plan.pieces.every((piece) => piece.backLength >= 300 - 1e-6)).toBe(true);
    for (const wall of [0, 2])
      expect(
        plan.pieces
          .filter((piece) => piece.wallIndex === wall)
          .reduce((sum, piece) => sum + piece.backLength, 0),
      ).toBeCloseTo(2500);
  });

  it('refuses invalid outlines and stock settings', () => {
    const room = rectangle();
    room.walls[3].length += 100;
    expect(planSkirting([room], settings, 5).pieces).toEqual([]);
    expect(
      planSkirting([rectangle()], { ...settings, stockLengths: [] }, 5).issues[0].severity,
    ).toBe('error');
    expect(
      planSkirting([rectangle()], { ...settings, minLength: 1e-10 }, 5).issues[0].severity,
    ).toBe('error');
  });

  it('numbers visible cuts continuously per room and remaps stock references', () => {
    const rooms = [rectangle(4000, 3000, 'one'), rectangle(4000, 3000, 'two')];
    const plan = planSkirting(rooms, settings, 5);
    const cuts = skirtingCuts(plan);
    expect(plan.pieces.length).toBeGreaterThan(cuts.length);
    for (const [roomIndex, room] of rooms.entries()) {
      const ids = cuts.filter((piece) => piece.roomId === room.id).map((piece) => piece.id);
      expect(ids.length).toBeGreaterThan(0);
      expect(ids).toEqual(ids.map((_, index) => `${roomIndex === 0 ? 'A' : 'B'}${index + 1}`));
    }
    const ids = plan.pieces.map((piece) => piece.id);
    expect(new Set(ids).size).toBe(ids.length);
    expect(plan.stocks.flatMap((stock) => stock.pieceIds).sort()).toEqual([...ids].sort());
    expect(plan).toEqual(planSkirting(rooms, settings, 5));
  });

  it('keeps valid rooms when another room has an undersized run or unclosed outline', () => {
    const valid = rectangle(4000, 3000, 'valid');
    const small = rectangle(4000, 3000, 'small');
    small.walls[0].doors = [{ id: 'door', offset: 200, width: 900 }];
    const open = rectangle(4000, 3000, 'open');
    open.walls[0].length += 100;
    const plan = planSkirting([valid, small, open], settings, 5);
    expect(plan.pieces.length).toBeGreaterThan(0);
    expect(plan.pieces.every((piece) => piece.roomId === valid.id)).toBe(true);
    expect(
      plan.issues.filter((issue) => issue.severity === 'error').map((issue) => issue.roomId),
    ).toEqual(['small', 'open']);
    expect(plan.stockCount).toBe(planSkirting([valid], settings, 5).stockCount);
    expect(
      planSkirting([valid], { ...settings, stockLengths: [] }, 5).issues[0].roomId,
    ).toBeUndefined();
  });

  it('attributes corner stock-fit failures to the affected room', () => {
    const valid = rectangle(4000, 3000, 'valid');
    const triangle: Room = {
      id: 'triangle',
      name: 'Triangle',
      direction: 0,
      walls: [0, 1, 2].map((index) => ({ id: `w${index}`, length: 3000, turn: 120, doors: [] })),
    };
    const plan = planSkirting(
      [valid, triangle],
      { ...settings, stockLengths: [500], minLength: 490 },
      5,
    );
    expect(plan.pieces.length).toBeGreaterThan(0);
    expect(plan.pieces.every((piece) => piece.roomId === valid.id)).toBe(true);
    const failures = plan.issues.filter((issue) => issue.severity === 'error');
    expect(failures.length).toBeGreaterThan(0);
    expect(
      failures.every(
        (issue) => issue.roomId === triangle.id && issue.message.includes('stock lengths'),
      ),
    ).toBe(true);
  });
});