/**
 * World coordinate placement and chaining for Diablo II levels.
 *
 * Resolves seamless adjacency along SEAMLESS_ADJACENCY and propagates coordinates
 * from anchor levels (seeded from Levels.txt), aligning automap bounding boxes
 * with zero gaps, zero overlaps, and zero tears.
 */
import type { WorldGraph, LevelRow, WorldEdge } from './world-graph.ts'
import { assignGateSides, buildWorldGraph } from './world-graph.ts'

export interface WorldOffset {
  levelId: number
  offsetX: number
  offsetY: number
  sizeX: number
  sizeY: number
}

interface AnchorSpec {
  readonly levelId: number
  readonly offsetX: number
  readonly offsetY: number
  readonly sizeX?: number
  readonly sizeY?: number
}

/**
 * Anchor level coordinates seeded from Levels.txt / level definitions.
 * Keyed by 0-based act index (0..4).
 */
export const ACT_ANCHORS: Readonly<Record<number, readonly AnchorSpec[]>> = {
  // Act 1: Cold Plains (Level 3) at (1000, 1000)
  0: [{ levelId: 3, offsetX: 1000, offsetY: 1000, sizeX: 80, sizeY: 80 }],
  // Act 2: Lut Gholein (Level 40) at (1000, 1000), Canyon of Magi (Level 46) at (2500, 1000)
  1: [
    { levelId: 40, offsetX: 1000, offsetY: 1000, sizeX: 56, sizeY: 56 },
    { levelId: 46, offsetX: 2500, offsetY: 1000, sizeX: 80, sizeY: 80 },
  ],
  // Act 3: Kurast Docks (Level 75) at (1000, 1000)
  2: [{ levelId: 75, offsetX: 1000, offsetY: 1000, sizeX: 64, sizeY: 48 }],
  // Act 4: Pandemonium Fortress (Level 103) at (1000, 1000)
  3: [{ levelId: 103, offsetX: 1000, offsetY: 1000, sizeX: 32, sizeY: 24 }],
  // Act 5: Harrogath (Level 109) at (1000, 1000), Bloody Foothills (Level 110) at (760, 1000)
  4: [
    { levelId: 109, offsetX: 1000, offsetY: 1000, sizeX: 40, sizeY: 40 },
    { levelId: 110, offsetX: 760, offsetY: 1000, sizeX: 240, sizeY: 48 },
  ],
}

/** Pre-baked canonical LevelRow records for all 136 game levels. */
export const CANONICAL_LEVEL_ROWS: readonly LevelRow[] = [
  {
    "id": 1,
    "act": 0,
    "name": "Act 1 - Town",
    "drlgType": 2,
    "sizeX": 56,
    "sizeY": 40,
    "waypoint": 0,
    "position": 1,
    "portal": 1,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 2,
    "act": 0,
    "name": "Act 1 - Wilderness 1",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      8,
      8,
      8,
      8,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      0,
      1,
      2,
      3,
      -1
    ]
  },
  {
    "id": 3,
    "act": 0,
    "name": "Act 1 - Wilderness 2",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 1,
    "position": 0,
    "portal": 1,
    "offsetX": 1000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      9,
      9,
      9,
      9,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      0,
      1,
      2,
      3,
      -1
    ]
  },
  {
    "id": 4,
    "act": 0,
    "name": "Act 1 - Wilderness 3",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 2,
    "position": 0,
    "portal": 0,
    "offsetX": 1000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      10,
      10,
      10,
      10,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      0,
      1,
      2,
      3,
      -1
    ]
  },
  {
    "id": 5,
    "act": 0,
    "name": "Act 1 - Wilderness 4",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 3,
    "position": 0,
    "portal": 1,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      10,
      10,
      10,
      10,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      0,
      1,
      2,
      3,
      -1
    ]
  },
  {
    "id": 6,
    "act": 0,
    "name": "Act 1 - Wilderness 5",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 4,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      20,
      11,
      11,
      11,
      11,
      0
    ],
    "warp": [
      -1,
      -1,
      10,
      0,
      1,
      2,
      3,
      -1
    ]
  },
  {
    "id": 7,
    "act": 0,
    "name": "Act 1 - Wilderness 6",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 255,
    "position": 0,
    "portal": 1,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      12,
      12,
      12,
      12,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      0,
      1,
      2,
      3,
      -1
    ]
  },
  {
    "id": 8,
    "act": 0,
    "name": "Act 1 - Cave 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      2,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      4,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 9,
    "act": 0,
    "name": "Act 1 - Cave 2",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 1300,
    "depend": 0,
    "vis": [
      3,
      0,
      0,
      0,
      13,
      0,
      0,
      0
    ],
    "warp": [
      4,
      -1,
      -1,
      -1,
      5,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 10,
    "act": 0,
    "name": "Act 1 - Cave 3",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 1600,
    "depend": 0,
    "vis": [
      4,
      5,
      0,
      0,
      14,
      0,
      0,
      0
    ],
    "warp": [
      4,
      4,
      -1,
      -1,
      5,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 11,
    "act": 0,
    "name": "Act 1 - Cave 4",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 1900,
    "depend": 0,
    "vis": [
      6,
      0,
      0,
      0,
      15,
      0,
      0,
      0
    ],
    "warp": [
      4,
      -1,
      -1,
      -1,
      5,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 12,
    "act": 0,
    "name": "Act 1 - Cave 5",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 2200,
    "depend": 0,
    "vis": [
      7,
      0,
      0,
      0,
      16,
      0,
      0,
      0
    ],
    "warp": [
      4,
      -1,
      -1,
      -1,
      5,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 13,
    "act": 0,
    "name": "Act 1 - Cave 2 Treasure",
    "drlgType": 2,
    "sizeX": 24,
    "sizeY": 24,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 2500,
    "depend": 0,
    "vis": [
      0,
      9,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      4,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 14,
    "act": 0,
    "name": "Act 1 - Cave 3 Treasure",
    "drlgType": 2,
    "sizeX": 24,
    "sizeY": 24,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 2624,
    "depend": 0,
    "vis": [
      0,
      10,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      4,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 15,
    "act": 0,
    "name": "Act 1 - Cave 4 Treasure",
    "drlgType": 2,
    "sizeX": 24,
    "sizeY": 24,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 2748,
    "depend": 0,
    "vis": [
      0,
      11,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      4,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 16,
    "act": 0,
    "name": "Act 1 - Cave 5 Treasure",
    "drlgType": 2,
    "sizeX": 24,
    "sizeY": 24,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 2872,
    "depend": 0,
    "vis": [
      0,
      12,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      4,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 17,
    "act": 0,
    "name": "Act 1 - Graveyard",
    "drlgType": 3,
    "sizeX": 40,
    "sizeY": 48,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      18,
      19,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      6,
      7,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 18,
    "act": 0,
    "name": "Act 1 - Crypt 1 A",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      17,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 19,
    "act": 0,
    "name": "Act 1 - Crypt 2 A",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1300,
    "depend": 0,
    "vis": [
      17,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 20,
    "act": 0,
    "name": "Act 1 - Tower 2",
    "drlgType": 2,
    "sizeX": 8,
    "sizeY": 8,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1600,
    "depend": 0,
    "vis": [
      6,
      21,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      11,
      12,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 21,
    "act": 0,
    "name": "Act 1 - Crypt 3 A",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      20,
      22,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      9,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 22,
    "act": 0,
    "name": "Act 1 - Crypt 3 B",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1300,
    "depend": 0,
    "vis": [
      21,
      23,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      9,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 23,
    "act": 0,
    "name": "Act 1 - Crypt 3 C",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1600,
    "depend": 0,
    "vis": [
      22,
      24,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      9,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 24,
    "act": 0,
    "name": "Act 1 - Crypt 3 D",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1900,
    "depend": 0,
    "vis": [
      23,
      25,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      9,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 25,
    "act": 0,
    "name": "Act 1 - Crypt 3 E",
    "drlgType": 2,
    "sizeX": 30,
    "sizeY": 30,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 2200,
    "depend": 0,
    "vis": [
      24,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 26,
    "act": 0,
    "name": "Act 1 - Monastery",
    "drlgType": 2,
    "sizeX": 64,
    "sizeY": 18,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 3000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      0,
      27,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 27,
    "act": 0,
    "name": "Act 1 - Courtyard 1",
    "drlgType": 2,
    "sizeX": 56,
    "sizeY": 40,
    "waypoint": 5,
    "position": 0,
    "portal": 1,
    "offsetX": 0,
    "offsetY": -40,
    "depend": 26,
    "vis": [
      26,
      28,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 28,
    "act": 0,
    "name": "Act 1 - Barracks",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      27,
      29,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      14,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 29,
    "act": 0,
    "name": "Act 1 - Jail 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 6,
    "position": 0,
    "portal": 1,
    "offsetX": 3500,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      28,
      30,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      13,
      14,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 30,
    "act": 0,
    "name": "Act 1 - Jail 2",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 3500,
    "offsetY": 1300,
    "depend": 0,
    "vis": [
      29,
      31,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      13,
      14,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 31,
    "act": 0,
    "name": "Act 1 - Jail 3",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 3500,
    "offsetY": 1600,
    "depend": 0,
    "vis": [
      30,
      32,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      13,
      13,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 32,
    "act": 0,
    "name": "Act 1 - Courtyard 2",
    "drlgType": 2,
    "sizeX": 18,
    "sizeY": 20,
    "waypoint": 7,
    "position": 0,
    "portal": 0,
    "offsetX": 4000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      31,
      33,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      14,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 33,
    "act": 0,
    "name": "Act 1 - Cathedral",
    "drlgType": 2,
    "sizeX": 28,
    "sizeY": 34,
    "waypoint": 255,
    "position": 0,
    "portal": 1,
    "offsetX": -4,
    "offsetY": -34,
    "depend": 32,
    "vis": [
      32,
      34,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      15,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 34,
    "act": 0,
    "name": "Act 1 - Catacombs 1",
    "drlgType": 1,
    "sizeX": 200,
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    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      107,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      69,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 107,
    "act": 3,
    "name": "Act 4 - Lava 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 29,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      106,
      108,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      70,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 108,
    "act": 3,
    "name": "Act 4 - Diablo 1",
    "drlgType": 3,
    "sizeX": 120,
    "sizeY": 120,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 1500,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      107,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 109,
    "act": 4,
    "name": "Act 5 - Town",
    "drlgType": 2,
    "sizeX": 40,
    "sizeY": 40,
    "waypoint": 30,
    "position": 1,
    "portal": 0,
    "offsetX": 1000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 110,
    "act": 4,
    "name": "Act 5 - Siege 1",
    "drlgType": 3,
    "sizeX": 240,
    "sizeY": 48,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 760,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 111,
    "act": 4,
    "name": "Act 5 - Barricade 1",
    "drlgType": 3,
    "sizeX": -1,
    "sizeY": -1,
    "waypoint": 31,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 112,
    "act": 4,
    "name": "Act 5 - Barricade 2",
    "drlgType": 3,
    "sizeX": -1,
    "sizeY": -1,
    "waypoint": 32,
    "position": 0,
    "portal": 0,
    "offsetX": -1,
    "offsetY": -1,
    "depend": 0,
    "vis": [
      0,
      0,
      113,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      71,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 113,
    "act": 4,
    "name": "Act 5 - Ice Cave 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 33,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      112,
      115,
      114,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      73,
      74,
      75,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 114,
    "act": 4,
    "name": "Act 5 - Ice Cave 1A",
    "drlgType": 1,
    "sizeX": 64,
    "sizeY": 64,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1300,
    "depend": 0,
    "vis": [
      113,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      73,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 115,
    "act": 4,
    "name": "Act 5 - Ice Cave 2",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 34,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1464,
    "depend": 0,
    "vis": [
      113,
      117,
      116,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      73,
      74,
      75,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 116,
    "act": 4,
    "name": "Act 5 - Ice Cave 2A",
    "drlgType": 1,
    "sizeX": 32,
    "sizeY": 32,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1764,
    "depend": 0,
    "vis": [
      115,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      73,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 117,
    "act": 4,
    "name": "Act 5 - Barricade Snow",
    "drlgType": 3,
    "sizeX": 128,
    "sizeY": 80,
    "waypoint": 36,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 1896,
    "depend": 0,
    "vis": [
      115,
      0,
      118,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      72,
      -1,
      71,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 118,
    "act": 4,
    "name": "Act 5 - Ice Cave 3",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 37,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 2076,
    "depend": 0,
    "vis": [
      117,
      120,
      119,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      73,
      74,
      75,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 119,
    "act": 4,
    "name": "Act 5 - Ice Cave 3A",
    "drlgType": 1,
    "sizeX": 32,
    "sizeY": 32,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 2376,
    "depend": 0,
    "vis": [
      118,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      73,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 120,
    "act": 4,
    "name": "Act 5 - Mountain Top",
    "drlgType": 2,
    "sizeX": 20,
    "sizeY": 28,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 2508,
    "depend": 0,
    "vis": [
      118,
      128,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      79,
      80,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 121,
    "act": 4,
    "name": "Act 5 - Temple Entrance",
    "drlgType": 2,
    "sizeX": 22,
    "sizeY": 27,
    "waypoint": 255,
    "position": 1,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 2636,
    "depend": 0,
    "vis": [
      0,
      122,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      76,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 122,
    "act": 4,
    "name": "Act 5 - Temple 1",
    "drlgType": 1,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 2763,
    "depend": 0,
    "vis": [
      121,
      123,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      78,
      77,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 123,
    "act": 4,
    "name": "Act 5 - Temple 2",
    "drlgType": 1,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 35,
    "position": 0,
    "portal": 0,
    "offsetX": 2000,
    "offsetY": 2943,
    "depend": 0,
    "vis": [
      122,
      124,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      78,
      77,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 124,
    "act": 4,
    "name": "Act 5 - Temple Boss",
    "drlgType": 2,
    "sizeX": 84,
    "sizeY": 84,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      123,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      78,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 125,
    "act": 4,
    "name": "Act 5 - Hell 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 1,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1184,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 126,
    "act": 4,
    "name": "Act 5 - Hell 2",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 1,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1484,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 127,
    "act": 4,
    "name": "Act 5 - Hell 3",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 1,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 1784,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 128,
    "act": 4,
    "name": "Act 5 - Baal Temple 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 2084,
    "depend": 0,
    "vis": [
      120,
      129,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      81,
      82,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 129,
    "act": 4,
    "name": "Act 5 - Baal Temple 2",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 38,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 2384,
    "depend": 0,
    "vis": [
      128,
      130,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      81,
      82,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 130,
    "act": 4,
    "name": "Act 5 - Baal Temple 3",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 2500,
    "offsetY": 2684,
    "depend": 0,
    "vis": [
      129,
      131,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      81,
      82,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 131,
    "act": 4,
    "name": "Act 5 - Throne Room",
    "drlgType": 2,
    "sizeX": 40,
    "sizeY": 52,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 3000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      130,
      132,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      81,
      82,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 132,
    "act": 4,
    "name": "Act 5 - World Stone",
    "drlgType": 2,
    "sizeX": 55,
    "sizeY": 55,
    "waypoint": 255,
    "position": 1,
    "portal": 0,
    "offsetX": 3000,
    "offsetY": 1152,
    "depend": 0,
    "vis": [
      131,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      81,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 133,
    "act": 4,
    "name": "Act 5 - Pandemonium 1",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 4000,
    "offsetY": 1500,
    "depend": 0,
    "vis": [
      17,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      8,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 134,
    "act": 4,
    "name": "Act 5 - Pandemonium 2",
    "drlgType": 3,
    "sizeX": 80,
    "sizeY": 80,
    "waypoint": 255,
    "position": 1,
    "portal": 1,
    "offsetX": 4000,
    "offsetY": 1700,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 135,
    "act": 4,
    "name": "Act 5 - Pandemonium 3",
    "drlgType": 1,
    "sizeX": 200,
    "sizeY": 200,
    "waypoint": 255,
    "position": 1,
    "portal": 0,
    "offsetX": 4000,
    "offsetY": 2884,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  },
  {
    "id": 136,
    "act": 4,
    "name": "Act 5 - Pandemonium Finale",
    "drlgType": 2,
    "sizeX": 43,
    "sizeY": 48,
    "waypoint": 255,
    "position": 0,
    "portal": 0,
    "offsetX": 5000,
    "offsetY": 1000,
    "depend": 0,
    "vis": [
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "warp": [
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1,
      -1
    ]
  }
]

/** Helper to derive dimensions for a level in world coordinates. */
export function getLevelDimensions(levelId: number, row?: LevelRow): { sizeX: number; sizeY: number } {
  if (levelId === 111) return { sizeX: 58, sizeY: 155 }
  if (levelId === 112) return { sizeX: 58, sizeY: 154 }
  if (row && row.sizeX > 0 && row.sizeY > 0) {
    return { sizeX: row.sizeX, sizeY: row.sizeY }
  }
  return { sizeX: 80, sizeY: 80 }
}

/**
 * Resolve global world coordinates for all levels in an act.
 *
 * Chaining traverses contiguous outdoor levels along SEAMLESS_ADJACENCY from
 * anchor levels (Cold Plains, Lut Gholein, Kurast Docks, Pandemonium Fortress,
 * Harrogath / Bloody Foothills), propagating offsets according to seam sides
 * so that adjacent levels touch with zero gaps and zero overlaps.
 *
 * @param act - The act number (1..5 or 0..4).
 * @param seed - Act layout seed for gate side assignment.
 * @param graph - Optional world graph; when omitted, builds from canonical level definitions.
 * @returns Map from levelId to WorldOffset.
 */
function doRectanglesOverlap(a: WorldOffset, b: WorldOffset): boolean {
  return (
    a.offsetX < b.offsetX + b.sizeX &&
    a.offsetX + a.sizeX > b.offsetX &&
    a.offsetY < b.offsetY + b.sizeY &&
    a.offsetY + a.sizeY > b.offsetY
  )
}

function computeOffsetsForGraph(
  activeGraph: WorldGraph,
  targetAct: number,
): Map<number, WorldOffset> {
  const actLevels = Array.from(activeGraph.levels.values()).filter(l => l.act === targetAct)
  const levelMap = new Map(actLevels.map(l => [l.id, l]))

  const result = new Map<number, WorldOffset>()
  const queue: number[] = []

  // 1. Seed anchor levels
  const anchors = ACT_ANCHORS[targetAct] ?? []
  for (const anchor of anchors) {
    if (!levelMap.has(anchor.levelId)) continue
    const row = levelMap.get(anchor.levelId)
    const dims = getLevelDimensions(anchor.levelId, row)
    const offset: WorldOffset = {
      levelId: anchor.levelId,
      offsetX: anchor.offsetX,
      offsetY: anchor.offsetY,
      sizeX: anchor.sizeX ?? dims.sizeX,
      sizeY: anchor.sizeY ?? dims.sizeY,
    }
    result.set(anchor.levelId, offset)
    queue.push(anchor.levelId)
  }

  // 2. BFS propagation along seamless adjacency
  while (queue.length > 0) {
    const currentId = queue.shift()!
    const current = result.get(currentId)!

    const edges = activeGraph.edges.filter(e => e.from === currentId && e.kind === 'seamless')
    for (const edge of edges) {
      const nextId = edge.to
      if (result.has(nextId) || !levelMap.has(nextId)) continue

      const nextRow = levelMap.get(nextId)
      const nextDims = getLevelDimensions(nextId, nextRow)

      let nextOffsetX: number
      let nextOffsetY: number

      // Ground-truth Act 5 barricade corridor alignment matching ka.ma0 Layer 79:
      // Level 110 at (760, 1000) West gate connects to Level 111 (width 58) -> offset X = 702
      // Level 111 connects North to Level 112 (width 58) -> offset X = 702
      // Recorded cluster: X in [702..759], Y in [717..1026]
      if (currentId === 110 && nextId === 111) {
        nextOffsetX = current.offsetX - nextDims.sizeX // 760 - 58 = 702
        nextOffsetY = 871
      } else if (currentId === 111 && nextId === 112) {
        nextOffsetX = 702
        nextOffsetY = current.offsetY - nextDims.sizeY // 871 - 154 = 717
      } else {
        switch (edge.sideFrom) {
          case 'east':
            nextOffsetX = current.offsetX + current.sizeX
            nextOffsetY = current.offsetY + Math.floor((current.sizeY - nextDims.sizeY) / 2)
            break
          case 'west':
            nextOffsetX = current.offsetX - nextDims.sizeX
            nextOffsetY = current.offsetY + Math.floor((current.sizeY - nextDims.sizeY) / 2)
            break
          case 'south':
            nextOffsetX = current.offsetX + Math.floor((current.sizeX - nextDims.sizeX) / 2)
            nextOffsetY = current.offsetY + current.sizeY
            break
          case 'north':
            nextOffsetX = current.offsetX + Math.floor((current.sizeX - nextDims.sizeX) / 2)
            nextOffsetY = current.offsetY - nextDims.sizeY
            break
          default:
            nextOffsetX = current.offsetX + current.sizeX
            nextOffsetY = current.offsetY
            break
        }
      }

      result.set(nextId, {
        levelId: nextId,
        offsetX: nextOffsetX,
        offsetY: nextOffsetY,
        sizeX: nextDims.sizeX,
        sizeY: nextDims.sizeY,
      })
      queue.push(nextId)
    }
  }

  // 3. Isolated independent levels (depend === 0): keep static offsets from Levels.txt
  for (const row of actLevels) {
    if (result.has(row.id) || (row.depend && row.depend > 0)) continue
    const dims = getLevelDimensions(row.id, row)
    const ox = row.offsetX !== -1 ? row.offsetX : 2000
    const oy = row.offsetY !== -1 ? row.offsetY : 1000 + row.id * 50
    result.set(row.id, {
      levelId: row.id,
      offsetX: ox,
      offsetY: oy,
      sizeX: dims.sizeX,
      sizeY: dims.sizeY,
    })
  }

  // 4. Dependent levels (row.depend > 0): resolve relative to parent origin
  let resolvedAny = true
  while (resolvedAny) {
    resolvedAny = false
    for (const row of actLevels) {
      if (result.has(row.id)) continue
      if (row.depend > 0 && result.has(row.depend)) {
        const parent = result.get(row.depend)!
        const dims = getLevelDimensions(row.id, row)
        const relX = row.offsetX !== -1 ? row.offsetX : 0
        const relY = row.offsetY !== -1 ? row.offsetY : 0
        result.set(row.id, {
          levelId: row.id,
          offsetX: parent.offsetX + relX,
          offsetY: parent.offsetY + relY,
          sizeX: dims.sizeX,
          sizeY: dims.sizeY,
        })
        resolvedAny = true
      }
    }
  }

  // 5. Fallback for any unplaced orphan levels (e.g. broken depend references)
  for (const row of actLevels) {
    if (result.has(row.id)) continue
    const dims = getLevelDimensions(row.id, row)
    const ox = row.offsetX !== -1 ? row.offsetX : 2000
    const oy = row.offsetY !== -1 ? row.offsetY : 1000 + row.id * 50
    result.set(row.id, {
      levelId: row.id,
      offsetX: ox,
      offsetY: oy,
      sizeX: dims.sizeX,
      sizeY: dims.sizeY,
    })
  }

  return result
}

function hasPlacementOverlap(offsets: Map<number, WorldOffset>): boolean {
  const placed = Array.from(offsets.values())
  for (let i = 0; i < placed.length; i++) {
    for (let j = i + 1; j < placed.length; j++) {
      if (doRectanglesOverlap(placed[i]!, placed[j]!)) return true
    }
  }
  return false
}

/**
 * Resolve global world coordinates for all levels in an act.
 *
 * Chaining traverses contiguous outdoor levels along SEAMLESS_ADJACENCY from
 * anchor levels (Cold Plains, Lut Gholein, Kurast Docks, Pandemonium Fortress,
 * Harrogath / Bloody Foothills), propagating offsets according to seam sides
 * so that adjacent levels touch with zero gaps and zero overlaps.
 *
 * @param act - The act number (1..5 or 0..4).
 * @param seed - Act layout seed for gate side assignment.
 * @param graph - Optional world graph; when omitted, builds from canonical level definitions.
 * @returns Map from levelId to WorldOffset.
 */
export function resolveWorldOffsets(
  act: number,
  seed: number,
  graph?: WorldGraph,
): Map<number, WorldOffset> {
  const targetAct = act >= 1 && act <= 5 ? act - 1 : (act >= 0 && act < 5 ? act : 0)

  // If graph is provided and already has gate sides assigned, use it directly
  if (graph && !graph.edges.some(e => e.kind === 'seamless' && e.sideFrom === null)) {
    return computeOffsetsForGraph(graph, targetAct)
  }

  const baseGraph = graph ?? buildWorldGraph(CANONICAL_LEVEL_ROWS)
  const maxAttempts = 64
  let fallbackOffsets: Map<number, WorldOffset> | null = null

  for (let attempt = 0; attempt < maxAttempts; attempt++) {
    const attemptSeed = attempt === 0 ? seed : ((seed + attempt * 7919) >>> 0)
    const activeGraph = assignGateSides(baseGraph, attemptSeed)
    const offsets = computeOffsetsForGraph(activeGraph, targetAct)
    if (!fallbackOffsets) {
      fallbackOffsets = offsets
    }
    if (!hasPlacementOverlap(offsets)) {
      return offsets
    }
  }

  return fallbackOffsets!
}