/**
 * FKTRY shared contracts — ORCHESTRATOR-OWNED.
 * Every lane imports from this file. NO lane edits it. If a contract blocks you,
 * write the problem in your lane doc's NOTES and stub around it locally.
 */

export const TICKS_PER_SECOND = 30;
export const TILE = 1; // world units per grid tile

export type Dir = 0 | 1 | 2 | 3; // N E S W (clockwise)
export interface Vec2 { x: number; y: number }

// ---------------------------------------------------------------- data schemas
// These mirror data/*.json (LANE-DATA owns the JSON, orchestrator owns the shape).

export interface ItemDef {
  id: string;          // kebab-case, matches codex name, e.g. "chroma-slurry"
  name: string;        // display, e.g. "CHROMA SLURRY"
  codex: string;       // section ref into docs/FKTRY_LORE.md, e.g. "2:chroma-slurry"
  tier: number;        // 0 raw, 1 refined, 2 product, 3 endgame
  color: string;       // hex, used by renderer placeholders + UI chips
}

export interface RecipeDef {
  id: string;
  machine: string;                  // MachineDef.id that can run it
  inputs: Record<string, number>;   // itemId -> count
  outputs: Record<string, number>;
  ticks: number;                    // duration at speed 1
  bandwidth: number;                // power draw while crafting (negative = generates)
  heat?: number;                    // heat per craft (software decoders etc.)
}

export type MachineKind =
  | 'extractor'   // pulls items from seam tiles, no inputs
  | 'crafter'     // recipe in -> out
  | 'belt'        // moves items
  | 'splitter'    // 1 in, N out round-robin
  | 'power'       // generates bandwidth
  | 'buffer'      // stores bandwidth smoothness (brownout protection)
  | 'shipper';    // consumes items => 'shipped' events => THE SCREEN

export interface MachineDef {
  id: string;
  name: string;
  codex: string;
  kind: MachineKind;
  footprint: Vec2;      // tiles occupied (w,h) before rotation
  recipes: string[];    // RecipeDef.ids this machine may run ([] for belts etc.)
  powerDraw: number;    // idle bandwidth draw
  powerGen?: number;
  beltSpeed?: number;   // tiles/sec, kind==='belt'
  asset: string;        // codex asset key for renderer mesh registry, e.g. "quantizer"
  color?: string;       // v3 RULING: CHASSIS/BODY color (codex §8 grime); the emissive
                        // accent stays derived from outputs. (Was mislabeled "accent".)
  flavor?: string;      // v2: codex one-liner for the inspector (DATA's material)
  heatPerTick?: number; // v2: heat while active (the software decoder's whole bit)
  bufferCap?: number;   // v2: bandwidth storage in bandwidth-SECONDS (see SimSnapshot)
  coolPerTick?: number; // v3: per-machine cooling rate; sim default 0.004
}

export interface TechDef {
  id: string;
  era: 'reel' | 'broadcast' | 'disc' | 'stream' | 'fortress';
  cost: Record<string, number>;     // science-pack itemId -> count
  unlocks: string[];                // machine/recipe ids
}

export interface CommissionDef {
  id: string;
  flavor: string;                   // the fax text — deadpan absurd
  wants: Record<string, number>;
  rewardBandwidth: number;
  repeat?: boolean;                 // v2: standing order — re-activates after completion
}

export interface GameData {
  items: ItemDef[];
  machines: MachineDef[];
  recipes: RecipeDef[];
  tech: TechDef[];
  commissions: CommissionDef[];
}

// ---------------------------------------------------------------- live sim state

export interface EntityState {
  id: number;
  def: string;                      // MachineDef.id
  pos: Vec2;                        // tile coords of origin corner
  dir: Dir;
  recipe: string | null;
  progress: number;                 // 0..1 of current craft
  inputBuf: Record<string, number>;
  outputBuf: Record<string, number>;
  jammed: string | null;            // human-readable reason or null
  heat: number;                     // 0..1, throttles >0.7, scrams at 1
  scrammed?: boolean;               // v3: heat-scram latch (heat alone can't show the
                                    // hysteresis window; renderer/UI read this, not 0.5)
}

export interface BeltItem {
  item: string;
  entity: number;                   // belt entity id
  t: number;                        // 0..1 progress along the belt tile
  id: number;                       // v3: stable per-item id (required — sim always stamps)
}

export interface SimSnapshot {
  tick: number;
  paused: boolean;
  entities: ReadonlyArray<EntityState>;
  beltItems: ReadonlyArray<BeltItem>;
  // v3 RULING on units: gen/draw are bandwidth per SECOND; stored is bandwidth-seconds
  // (sim integrates surplus/deficit divided by TICKS_PER_SECOND each tick).
  bandwidth: { gen: number; draw: number; stored: number; brownout: boolean };
  shippedTotal: Record<string, number>;
  activeCommission: string | null;
  commissionQueue?: string[];       // v3: truth for "next in tray" — active first, then
                                    // upcoming in activation order (hardens in v4)
  commissionProgress: Record<string, number>;
}

export type Command =
  | { kind: 'place'; def: string; pos: Vec2; dir: Dir }
  | { kind: 'remove'; pos: Vec2 }
  | { kind: 'rotate'; pos: Vec2 }
  | { kind: 'setRecipe'; entity: number; recipe: string | null }
  | { kind: 'setRecipeAt'; pos: Vec2; recipe: string | null }   // v3: id-free variant
  | { kind: 'setPaused'; paused: boolean };

export type SimEvent =
  | { kind: 'shipped'; item: string; count: number; tick: number }
  | { kind: 'crafted'; entity: number; recipe: string; tick: number }
  | { kind: 'jammed'; entity: number; reason: string; tick: number }
  | { kind: 'brownout'; on: boolean; tick: number }
  | { kind: 'placed'; entity: number; def: string; tick: number }
  | { kind: 'removed'; entity: number; def: string; tick: number }
  | { kind: 'commissionDone'; commission: string; tick: number }
  | { kind: 'scram'; entity: number; on: boolean; tick: number }; // v2: heat shutdown edge

// ---------------------------------------------------------------- module interfaces

export interface Sim {
  init(data: GameData, seed: number): void;
  enqueue(cmd: Command): void;
  tick(): void;                       // advance exactly one tick
  snapshot(): SimSnapshot;            // read-only view; renderer/ui must not mutate
  drainEvents(): SimEvent[];          // events since last drain (main loop fans out)
  save?(): string;                    // v3: full state as JSON, deterministic round-trip
  load?(json: string): void;          // v3: restore a save() blob (hardens in v4)
}

export interface Renderer {
  init(container: HTMLElement, data: GameData): Promise<void>;
  render(snap: SimSnapshot, alpha: number): void;  // alpha: 0..1 interp between ticks
  pickTile(clientX: number, clientY: number): Vec2 | null;
  setGhost(def: string | null, pos: Vec2 | null, dir: Dir): void;
}

export interface UIBus {
  dispatch(cmd: Command): void;
  /** current build selection; renderer ghost + click-to-place read this */
  selectedBuild(): { def: string; dir: Dir } | null;
  /** v2: world picking, plumbed from the renderer — UI's click-to-inspect */
  pickTile(clientX: number, clientY: number): Vec2 | null;
}

export interface UI {
  init(root: HTMLElement, data: GameData, bus: UIBus): void;
  update(snap: SimSnapshot, events: SimEvent[]): void;
}

export interface ScreenFX {
  init(canvas: HTMLCanvasElement, data: GameData): void;
  onEvents(events: SimEvent[]): void;  // shipped items feed the corruption
  frame(timeMs: number, snap?: SimSnapshot): void; // v3: read-only peek for continuous
                                                   // strain (stored, heat); never retain
}