import type { DungeonDefinition, DungeonBossObjective } from "../dungeonTypes";
import type { PopulationEntityDefinition, StaticMobSpawnDefinition } from "../mobPopulation";
import type { DungeonWorldObjectDefinition } from "../dungeonWorldObjects";
import {
  BITE_SIZED_STOCKADES_DUNGEON_ID,
  STORMWIND_STOCKADE_DUNGEON_ID,
} from "../dungeonContentSource";
import { seededBossIndex } from "./seededBossSelection";

const BOSS_ROOM_POSITION = [-159.582, -25.6062, 1.2531] as const;
const CENTRAL_CORRIDOR_HALF_WIDTH = 15;

export interface BiteSizedStockadesBossCandidate {
  readonly sourceSpawnId: string;
  readonly name: string;
}

export const BITE_SIZED_STOCKADES_BOSS_CANDIDATES: readonly BiteSizedStockadesBossCandidate[] = Object.freeze([
  { sourceSpawnId: "creature-84027", name: "Targorr the Dread" },
  { sourceSpawnId: "creature-79088", name: "Kam Deepfury" },
  { sourceSpawnId: "creature-79098", name: "Hamhock" },
  { sourceSpawnId: "creature-79124", name: "Bazil Thredd" },
  { sourceSpawnId: "creature-79116", name: "Dextren Ward" },
]);

export function biteSizedStockadesBossIndex(seed: string): number {
  return seededBossIndex(seed, BITE_SIZED_STOCKADES_BOSS_CANDIDATES.length);
}

function branchWall(id: string, name: string, z: number): DungeonWorldObjectDefinition {
  return {
    id,
    name,
    kind: "gate",
    position: [-129.17, -22.1, z],
    halfExtents: [6, 5.2, 0.65],
    initialState: "sealed",
    states: [{
      id: "sealed",
      label: "Sealed",
      visible: true,
      blocksMovement: true,
      blocksSight: true,
      interactionEnabled: false,
    }],
    visual: { color: "#332f2b" },
    source: {
      fidelity: "healer-man-authored",
      files: ["src/game/dungeons/biteSizedStockades.ts"],
      note: "Permanent wall for the bite-sized route; the source Stockades geometry remains unchanged.",
    },
  };
}

function sourceBoss(
  source: DungeonDefinition,
  candidate: BiteSizedStockadesBossCandidate,
): { readonly spawn: StaticMobSpawnDefinition; readonly entity: PopulationEntityDefinition } {
  const spawn = source.staticSpawns.find((entry) => entry.id === candidate.sourceSpawnId);
  const entity = spawn ? source.entities[spawn.entityId] : undefined;
  if (!spawn || !entity || entity.kind !== "boss") {
    throw new Error(`Stockades boss source is missing: ${candidate.sourceSpawnId}`);
  }
  return { spawn, entity };
}

/**
 * Builds a one-boss Stockades variant without mutating the generated source definition.
 * The seed controls only boss identity, so saves and online party members can reconstruct
 * the same run while a fresh run receives a new random selection.
 */
export function createBiteSizedStockadesDefinition(
  source: DungeonDefinition,
  seed: string,
): DungeonDefinition {
  if (source.id !== STORMWIND_STOCKADE_DUNGEON_ID) {
    throw new Error(`Bite-sized Stockades requires ${STORMWIND_STOCKADE_DUNGEON_ID}.`);
  }
  const candidate = BITE_SIZED_STOCKADES_BOSS_CANDIDATES[biteSizedStockadesBossIndex(seed)];
  const selected = sourceBoss(source, candidate);
  const sourceBossIds = new Set(BITE_SIZED_STOCKADES_BOSS_CANDIDATES.map((entry) => entry.sourceSpawnId));
  const corridorSpawns = source.staticSpawns.filter((spawn) => (
    !sourceBossIds.has(spawn.id)
    && Math.abs(spawn.position[2]) <= CENTRAL_CORRIDOR_HALF_WIDTH
  ));
  const usedEntityIds = new Set(corridorSpawns.map((spawn) => spawn.entityId));
  const entities = Object.fromEntries([
    ...Object.entries(source.entities).filter(([entityId]) => usedEntityIds.has(entityId)),
    [selected.spawn.entityId, selected.entity],
  ]);
  const boss: DungeonBossObjective = {
    id: candidate.sourceSpawnId,
    name: candidate.name,
    position: BOSS_ROOM_POSITION,
  };

  return {
    ...source,
    id: BITE_SIZED_STOCKADES_DUNGEON_ID,
    title: "Stormwind Stockade: Cellblock Rush",
    lfgDungeonIds: [],
    presentation: {
      ...source.presentation,
      location: "Stormwind Stockade · Central Cellblock",
      theme: "Bite-Sized Dungeon",
      summary: "Race through the central cellblock and defeat one surprise warden chosen from the five Stockades bosses.",
      loadingMessage: "Sealing the side wings and choosing a cellblock warden...",
      unchartedAreaName: "Central Cellblock",
    },
    areas: [
      { ...source.entrance, id: "entrance", center: source.entrance.footPosition, radius: 35 },
      { id: "bite-sized-boss-room", name: `${candidate.name}'s Cell`, center: BOSS_ROOM_POSITION, radius: 32 },
    ],
    entities,
    staticSpawns: [
      ...corridorSpawns,
      {
        id: candidate.sourceSpawnId,
        entityId: selected.spawn.entityId,
        sourceCreatureGuid: selected.spawn.sourceCreatureGuid,
        position: BOSS_ROOM_POSITION,
        yaw: selected.spawn.yaw,
        spawnMask: selected.spawn.spawnMask,
      },
    ],
    roamingPacks: [],
    bosses: [boss],
    objectiveOrder: [boss],
    finalBossDurability: "standard",
    // Keep the complete reviewed Stockades navigation graph connected. The
    // physical branch walls, not navmesh pruning, close the unused wings.
    navigationLinks: source.navigationLinks,
    traversalRamps: source.traversalRamps,
    encounters: [{
      id: `${BITE_SIZED_STOCKADES_DUNGEON_ID}:boss-progression`,
      dungeonId: BITE_SIZED_STOCKADES_DUNGEON_ID,
      initialPhase: "progression",
      initialState: { flags: { "dungeon-complete": false } },
      resetPolicy: { bossWipePhase: "progression", checkpointPhase: "progression" },
      source: {
        fidelity: "healer-man-authored",
        scope: "boss-progression",
        files: ["src/game/dungeons/biteSizedStockades.ts"],
        reviewedBehavior: "A single seeded Stockades boss completes the bite-sized run in the first boss room.",
        adaptations: [
          "Each seeded run retains the selected source boss objective ID so saves, loot, guides, and leaderboards report the correct variant.",
          "The one-boss run uses standard boss durability instead of the campaign-finale health floor.",
          "The side-wing stairs retain their navigation bridges so the central route stays on the retained navmesh component; physical walls seal both unused wings.",
        ],
        remainingGaps: [],
      },
      rules: [
        {
          id: "boss-defeated",
          trigger: { kind: "entities-dead", entityIds: [candidate.sourceSpawnId] },
          actions: [
            { id: "record-boss", kind: "complete-objective", objectiveId: candidate.sourceSpawnId, persistence: "run" },
            { id: "checkpoint-boss", kind: "set-checkpoint", checkpointId: candidate.sourceSpawnId, persistence: "checkpoint" },
          ],
        },
        {
          id: "complete-run",
          trigger: { kind: "tick" },
          guards: [{ kind: "objective-complete", objectiveId: candidate.sourceSpawnId, equals: true }],
          actions: [
            { id: "mark-dungeon-complete", kind: "set-flag", flagId: "dungeon-complete", value: true, persistence: "run" },
            { id: "enter-complete-phase", kind: "set-phase", phase: "complete", persistence: "run" },
          ],
        },
      ],
    }],
    encounterSpawnGroups: [],
    serverGameObjects: [
      ...source.serverGameObjects.filter((object) => Math.abs(object.position[2]) <= CENTRAL_CORRIDOR_HALF_WIDTH),
      branchWall("bite-sized-stockades-north-wall", "Sealed North Wing", 16.4),
      branchWall("bite-sized-stockades-south-wall", "Sealed South Wing", -16.4),
    ],
    validation: {
      ...source.validation,
      warnings: [
        ...source.validation.warnings,
        "Bite-sized layout and branch walls are Healer Man-authored; environment and combat assets are shared with Stormwind Stockade.",
      ],
    },
  };
}