class_name TestHarness
extends RefCounted
## Standalone test simulation for client development without a running server.
## Generates mock ObserverSnapshots with movement, LOS, dialogue, and NPC
## interactions. Extracted from sim_bridge.gd to enforce D-020 information
## boundary (no game logic in the production client autoload).

var tick: int = 0
var player_pos: Vector2i = Vector2i(10, 10)
var facing: String = "North"
var input_queue: Array = []
var in_dialogue: bool = false
var gauntlet_mode: bool = false
var npc_relationship: String = "Unknown"


func reset() -> void:
	tick = 0
	player_pos = Vector2i(10, 10)
	facing = "North"
	input_queue.clear()
	in_dialogue = false
	gauntlet_mode = false
	npc_relationship = "Unknown"


func process_input(action_name: String) -> void:
	input_queue.append(action_name)


func process_facing(new_facing: String) -> void:
	facing = new_facing


# -- Snapshot generation -------------------------------------------------------

func snapshot() -> Dictionary:
	tick += 1

	# Process queued inputs
	for action_name in input_queue:
		if action_name == "TeleportToHub":
			player_pos = Vector2i(10, 10)
			in_dialogue = false
			continue
		if action_name == "Interact":
			var npc_pos := Vector2i(12, 9)
			var dist := absi(player_pos.x - npc_pos.x) + absi(player_pos.y - npc_pos.y)
			if dist <= 2 and has_los(player_pos, npc_pos):
				in_dialogue = true
			continue
		var delta := action_to_delta(action_name)
		var new_pos := player_pos + delta
		if _is_walkable(new_pos):
			player_pos = new_pos
			if delta != Vector2i.ZERO:
				if in_dialogue:
					in_dialogue = false
	input_queue.clear()

	var px := player_pos.x
	var py := player_pos.y

	# Build entities — player always visible
	var entities: Array = [{
		"entity_id": 1,
		"x": float(px),
		"y": float(py),
		"z": 0,
		"kind": { "variant": "Player", "data": null },
		"visibility": "Forward",
	}]

	# NPC at (12, 9) — visible if within range and not blocked by wall at (12, 10)
	var npc_pos := Vector2i(12, 9)
	var npc_dist := absi(px - npc_pos.x) + absi(py - npc_pos.y)
	if npc_dist <= 4 and has_los(Vector2i(px, py), npc_pos):
		var sector: String = "Forward" if npc_pos.y <= py else "Peripheral"
		entities.append({
			"entity_id": 2,
			"x": float(npc_pos.x),
			"y": float(npc_pos.y),
			"z": 0,
			"kind": { "variant": "Npc", "data": null },
			"visibility": sector,
			"relationship": npc_relationship,
		})

	# v4: nearby_interactions when NPC is nearby and visible (#404/#405)
	var nearby: Array = []
	if npc_dist <= 2 and has_los(Vector2i(px, py), npc_pos):
		nearby.append({
			"entity_id": 2,
			"entity_type": "Npc",
			"distance": npc_dist,
			"verbs": [
				{"kind": "Talk", "label": "Talk", "priority": 1, "available": true},
				{"kind": "ExamineNpc", "label": "Observe", "priority": 2, "available": true},
			],
		})

	# v5: monologue on first tick (#414)
	var monologue: Variant = null
	if tick == 1:
		monologue = {
			"id": "test_enter_001",
			"text": "Sova Transit District. Population twelve thousand and change.",
			"duration_seconds": 5.0,
		}

	# v7: mock dialogue (#435, D-061/D-062)
	var dialogue: Variant = null
	if in_dialogue:
		dialogue = {
			"npc_name": "Kael",
			"npc_entity_id": 2,
			"speech": "Haven't seen you around the transit hub before. You new to Sova, or just passing through?",
			"options": [
				{"text": "Just arrived. Still getting my bearings.", "response_id": "kael_greet_01", "priority": 1, "confrontation": false},
				{"text": "Passing through. Know where I can find work?", "response_id": "kael_greet_02", "priority": 2, "confrontation": false},
				{"text": "I saw you near the cargo bay last night.", "response_id": "kael_confront_01", "priority": 3, "confrontation": true},
			],
		}

	# v7: mock pending_recognitions (#431, D-059/D-060)
	var pending_recs: Array = []
	var cycle_pos := tick % 12
	if cycle_pos < 6:
		var total_delay := 6
		var remaining := total_delay - cycle_pos
		pending_recs.append({
			"entity_id": 100,
			"x": 13.5,
			"y": 12.5,
			"z": 0,
			"remaining_ticks": remaining,
			"total_delay_ticks": total_delay,
		})

	# #535: Mock overheard NPC-NPC conversation (D-078)
	var conv_events: Array = []
	var conv_ended: Array = []
	var conv_start := 3
	var conv_lines := [
		{"speaker": "Mira", "target": "Soren", "line": "The cargo manifests don't add up. Three containers unaccounted for."},
		{"speaker": "Soren", "target": "Mira", "line": "Could be a logging error. Happens every... cycle."},
		{"speaker": "Mira", "target": "Soren", "line": "Not like this. Someone moved them after... check."},
		{"speaker": "Soren", "target": "Mira", "line": "You're reading too much into it. The docks are... these days."},
		{"speaker": "Mira", "target": "Soren", "line": "Then explain the weight discrepancy. Two hundred kilos... just gone."},
		{"speaker": "Soren", "target": "Mira", "line": "Fine. I'll pull the bay... tonight. But keep this between us."},
	]
	var conv_tick_interval := 5
	var conv_total_ticks := conv_lines.size() * conv_tick_interval
	if tick >= conv_start and tick < conv_start + conv_total_ticks:
		var conv_index := (tick - conv_start) / conv_tick_interval
		var within_tick := (tick - conv_start) % conv_tick_interval
		if within_tick == 0 and conv_index < conv_lines.size():
			var cl: Dictionary = conv_lines[conv_index]
			conv_events.append({
				"speaker_id": 10,
				"target_id": 11,
				"speaker_name": cl.speaker,
				"target_name": cl.target,
				"occluded_line": cl.line,
			})
	elif tick == conv_start + conv_total_ticks:
		conv_ended.append({"speaker_id": 10, "target_id": 11})

	return {
		"tick": tick,
		"version": Protocol.PROTOCOL_VERSION,
		"game_time": {
			"day": 0,
			"time_of_day": tick * 10,
			"day_phase": "Morning",
			"tick_rate": "Full",
		},
		"player_facing": facing,
		"player_stance": "Walk",
		"player_inventory": [],
		"entities": entities,
		"visible_tiles": _visible_tiles(),
		"nearby_interactions": nearby,
		"current_monologue": monologue,
		"current_dialogue": dialogue,
		"pending_recognitions": pending_recs,
		"gauntlet_mode": gauntlet_mode,
		"conversation_events": conv_events,
		"conversation_ended": conv_ended,
		"save_result": null,
	}


# -- Map generation ------------------------------------------------------------

func _tiles() -> Array:
	var tiles: Array = []
	var room_x := 7
	var room_y := 7
	var room_w := 8
	var room_h := 8

	for x in range(room_x, room_x + room_w):
		for y in range(room_y, room_y + room_h):
			var is_edge := (x == room_x or x == room_x + room_w - 1
				or y == room_y or y == room_y + room_h - 1)
			var tile_type: String
			if is_edge:
				if y == room_y + room_h - 1 and x == room_x + room_w / 2:
					tile_type = "door"
				else:
					tile_type = "wall"
			else:
				tile_type = "floor"
			tiles.append({"x": x, "y": y, "z": 0, "type": tile_type})

	var door_x := room_x + room_w / 2
	for y in range(room_y + room_h, room_y + room_h + 4):
		tiles.append({"x": door_x - 1, "y": y, "z": 0, "type": "wall"})
		tiles.append({"x": door_x, "y": y, "z": 0, "type": "floor"})
		tiles.append({"x": door_x + 1, "y": y, "z": 0, "type": "wall"})

	return tiles


func _visible_tiles() -> Array:
	var vtiles: Array = []
	var px := player_pos.x
	var py := player_pos.y
	var radius := 5
	var room_x := 7
	var room_y := 7
	var room_w := 8
	var room_h := 8

	for x in range(px - radius, px + radius + 1):
		for y in range(py - radius, py + radius + 1):
			var dist := absf(x - px) + absf(y - py)
			if dist <= radius:
				if x >= room_x and x < room_x + room_w and y >= room_y and y < room_y + room_h:
					var sector: String = "Forward" if y <= py else "Peripheral"
					vtiles.append({"x": x, "y": y, "z": 0, "visibility": sector, "type": _get_tile_type(x, y)})
	return vtiles


func _get_tile_type(x: int, y: int) -> String:
	var room_x := 7
	var room_y := 7
	var room_w := 8
	var room_h := 8
	var is_edge := (x == room_x or x == room_x + room_w - 1
		or y == room_y or y == room_y + room_h - 1)
	if is_edge:
		if y == room_y + room_h - 1 and x == room_x + room_w / 2:
			return "door"
		return "wall"
	return "floor"


# -- Spatial helpers -----------------------------------------------------------

const _WALLS: Array = [
	# Room walls (8x8 room from (7,7) to (14,14))
	Vector2i(7,7), Vector2i(8,7), Vector2i(9,7), Vector2i(10,7),
	Vector2i(11,7), Vector2i(12,7), Vector2i(13,7), Vector2i(14,7),
	Vector2i(7,14), Vector2i(8,14), Vector2i(9,14), Vector2i(10,14),
	Vector2i(11,14), Vector2i(12,14), Vector2i(13,14), Vector2i(14,14),
	Vector2i(7,8), Vector2i(7,9), Vector2i(7,10), Vector2i(7,11),
	Vector2i(7,12), Vector2i(7,13),
	Vector2i(14,8), Vector2i(14,9), Vector2i(14,10), Vector2i(14,11),
	Vector2i(14,12), Vector2i(14,13),
	# Interior wall blocking NPC
	Vector2i(12, 10),
]


func _is_walkable(pos: Vector2i) -> bool:
	return not _WALLS.has(pos)


func has_los(from: Vector2i, to: Vector2i) -> bool:
	var dx := absi(to.x - from.x)
	var dy := absi(to.y - from.y)
	var sx := 1 if from.x < to.x else -1
	var sy := 1 if from.y < to.y else -1
	var err := dx - dy
	var cx := from.x
	var cy := from.y
	while true:
		if cx == to.x and cy == to.y:
			return true
		if Vector2i(cx, cy) != from and not _is_walkable(Vector2i(cx, cy)):
			return false
		var e2 := 2 * err
		if e2 > -dy:
			err -= dy
			cx += sx
		if e2 < dx:
			err += dx
			cy += sy
	return true


static func action_to_delta(action_name: String) -> Vector2i:
	match action_name:
		"MoveNorth": return Vector2i(0, -1)
		"MoveNortheast": return Vector2i(1, -1)
		"MoveEast": return Vector2i(1, 0)
		"MoveSoutheast": return Vector2i(1, 1)
		"MoveSouth": return Vector2i(0, 1)
		"MoveSouthwest": return Vector2i(-1, 1)
		"MoveWest": return Vector2i(-1, 0)
		"MoveNorthwest": return Vector2i(-1, -1)
		_: return Vector2i.ZERO


static func delta_to_facing(delta: Vector2i) -> String:
	match delta:
		Vector2i(0, -1): return "North"
		Vector2i(1, -1): return "Northeast"
		Vector2i(1, 0): return "East"
		Vector2i(1, 1): return "Southeast"
		Vector2i(0, 1): return "South"
		Vector2i(-1, 1): return "Southwest"
		Vector2i(-1, 0): return "West"
		Vector2i(-1, -1): return "Northwest"
		_: return "North"