extends Control

## #507: WRONG button — full 60-tick capture: ring buffer, snapshot history, replay seed.
## Upgrade of the Sprint 9 MVP (#495).
##
## On F12: pause sim, show one-line prompt, save all ring buffer data, unpause.
## Output: user://bug-reports/gauntlet-t{tick}-{timestamp}/
##   - snapshot.json      — single-tick point-in-time (MVP compat)
##   - render.txt         — client-side text render
##   - description.txt    — tester notes + room/tick/seed metadata
##   - inputs.jsonl       — last 60 ticks of PlayerInput (replay-compatible JSONL)
##   - snapshots.jsonl    — last 60 ticks of ObserverSnapshot (one JSON per line)
##   - seed.txt           — RNG seed for deterministic replay
##   - screenshot.png     — viewport capture taken before dialog opened
##
## Ring buffer: pre-allocated RING_SIZE arrays at startup. record_tick() is the
## public API for main.gd. _push_tick_inputs() / _push_tick_snapshot() are the
## internal implementations, exposed for unit testing (test_bug_report_ring_buffer.gd).
##
## Spec: inputs.jsonl is compatible with tooling/test-client --replay (replay.rs).
## Format: one JSON array per line, each array = Vec<PlayerInput> for that tick.

signal capture_completed
signal capture_cancelled

const BG_COLOR := Color(0.05, 0.05, 0.08, 0.85)
const BORDER_COLOR := Color("#4a9ebb")
const TEXT_COLOR := Color("#c8d0e0")
const FONT_SIZE := 14
const LABEL_FONT_SIZE := 13
const BOX_WIDTH := 500
const BOX_HEIGHT := 120
const PADDING := 16

# #507: Ring buffer capacity — 60 ticks of history
const RING_SIZE := 60

var _line_edit: LineEdit = null
var _active: bool = false
var _captured_screenshot: Image = null

# #507: Pre-allocated ring buffers (no per-tick allocation after _ready).
# Input ring: replay-format PlayerInput arrays, one per tick.
# Snapshot ring: ObserverSnapshot JSON strings, one per tick.
# Separate heads and counts so each buffer can be tested independently.
# Memory ceiling: 60 snapshot JSON strings (each ~2-8KB depending on entity count)
# + 60 input arrays (negligible). Worst case ~480KB resident. Acceptable for a
# debug tool that is always active during Gauntlet play.
var _input_ring: Array = []  # Array[Array] — each slot: Array of {tick, action} dicts
var _input_head: int = 0  # Next write index (0..RING_SIZE-1)
var _input_count: int = 0  # Filled slot count (0..RING_SIZE)

var _snapshot_ring: Array = []  # Array[String] — each slot: JSON-serialized ObserverSnapshot
var _snapshot_head: int = 0
var _snapshot_count: int = 0


func _ready() -> void:
	visible = false
	mouse_filter = Control.MOUSE_FILTER_STOP

	# Pre-allocate ring buffers — resize then fill sentinels.
	# The ring array itself never grows after _ready. Each write replaces the GDScript
	# reference in an existing slot (not a new allocation of the ring), though the input
	# Array stored per slot is a fresh ref each tick.
	_input_ring.resize(RING_SIZE)
	_snapshot_ring.resize(RING_SIZE)
	for i in range(RING_SIZE):
		_input_ring[i] = []
		_snapshot_ring[i] = ""


# ---------------------------------------------------------------------------
# Public API for main.gd: record one tick's data
# ---------------------------------------------------------------------------


## Record one tick. Called from main.gd on every server tick (snapshot arrival).
## - tick: current server tick number
## - snapshot_json: JSON.stringify(GameState.current_snapshot)
## - mapper_inputs: Array of InputMapper dicts (BUG_REPORT/OPEN_MENU excluded).
##   These are in raw InputMapper format and will be converted to replay format.
func record_tick(tick: int, snapshot_json: String, mapper_inputs: Array) -> void:
	# Convert mapper inputs to replay-compatible format, then push both buffers.
	var replay_inputs: Array = []
	for inp in mapper_inputs:
		var ri := _to_replay_format(inp, tick)
		if not ri.is_empty():
			replay_inputs.append(ri)
	_push_tick_inputs(tick, replay_inputs)
	_push_tick_snapshot(snapshot_json)


# ---------------------------------------------------------------------------
# Internal ring buffer operations (also exposed for tests)
# ---------------------------------------------------------------------------

## Push replay-format inputs for one tick. inputs is Array of {tick, action} dicts.
## Overwrites oldest entry when buffer is full (circular eviction).
@warning_ignore("unused_parameter")
func _push_tick_inputs(_tick: int, inputs: Array) -> void:
	_input_ring[_input_head] = inputs
	_input_head = (_input_head + 1) % RING_SIZE
	if _input_count < RING_SIZE:
		_input_count += 1


## Push a JSON-serialized ObserverSnapshot string for one tick.
func _push_tick_snapshot(snapshot_json: String) -> void:
	_snapshot_ring[_snapshot_head] = snapshot_json
	_snapshot_head = (_snapshot_head + 1) % RING_SIZE
	if _snapshot_count < RING_SIZE:
		_snapshot_count += 1


## Format the input ring buffer as JSONL for writing to inputs.jsonl.
## Returns a String with one JSON array per line, oldest to newest.
## Each line: Array of {tick, action} replay-format PlayerInput objects.
func _format_inputs_jsonl() -> String:
	var lines: PackedStringArray = []
	var start := (_input_head - _input_count + RING_SIZE) % RING_SIZE
	for i in range(_input_count):
		var idx := (start + i) % RING_SIZE
		lines.append(JSON.stringify(_input_ring[idx]))
	return "\n".join(lines)


## Format the snapshot ring buffer as JSONL for writing to snapshots.jsonl.
## Returns a String with one JSON string per line, oldest to newest.
func _format_snapshots_jsonl() -> String:
	var lines: PackedStringArray = []
	var start := (_snapshot_head - _snapshot_count + RING_SIZE) % RING_SIZE
	for i in range(_snapshot_count):
		var idx := (start + i) % RING_SIZE
		lines.append(_snapshot_ring[idx])
	return "\n".join(lines)


## Return the RNG seed for seed.txt. Never returns null.
## Uses GameState.rng_seed if available; falls back to "unavailable" string.
## Note: rng_seed is u64 on the server. JSON encodes u64 as a number, which
## loses precision above 2^53 via float intermediary. When the server field
## lands, consider string-encoding the seed to preserve all 64 bits.
func _get_current_seed() -> Variant:
	if GameState.rng_seed != null:
		return GameState.rng_seed
	return "unavailable"


## Convert one InputMapper dict to replay-compatible PlayerInput dict.
## Returns empty dict for client-only actions (BUG_REPORT, OPEN_MENU).
## Replay format: {"tick": N, "action": "MoveNorth"} or
##                {"tick": N, "action": {"Interact": {"target_entity_id": ..., "verb": ...}}}
func _to_replay_format(input: Dictionary, tick: int) -> Dictionary:
	var action_enum: int = input.get("action", -1)
	var wire: String = SimBridge.action_enum_to_wire(action_enum)
	if wire.is_empty():
		return {}  # Client-only action (BUG_REPORT, OPEN_MENU)

	var result := {"tick": tick}
	var action_data: Variant = input.get("action_data")

	match wire:
		"Interact":
			# Rust PlayerAction::Interact { target_entity_id, verb }
			result["action"] = {"Interact": action_data if action_data is Dictionary else {}}
		"SetFacing":
			# Rust PlayerAction::SetFacing(String) — wrap direction string
			var facing := ""
			if action_data is Dictionary:
				facing = str(action_data.get("facing", ""))
			result["action"] = {"SetFacing": facing}
		_:
			# Simple enum variants: "MoveNorth", "Pause", "TeleportToHub", etc.
			result["action"] = wire

	return result


# ---------------------------------------------------------------------------
# Test-accessible accessors (ring buffer introspection)
# ---------------------------------------------------------------------------


func _get_buffer_capacity() -> int:
	return RING_SIZE


func _get_snapshot_buffer_capacity() -> int:
	return RING_SIZE


func _get_input_buffer() -> Array:
	return _input_ring


func _get_filled_input_count() -> int:
	return _input_count


func _get_filled_snapshot_count() -> int:
	return _snapshot_count


# ---------------------------------------------------------------------------
# UI / capture flow
# ---------------------------------------------------------------------------


func start_capture() -> void:
	if _active:
		return
	# Capture screenshot BEFORE showing the dialog overlay
	_captured_screenshot = get_viewport().get_texture().get_image()
	_active = true
	visible = true

	# Pause the simulation
	(
		SimBridge
		. send_input(
			{
				"action": InputMapper.Action.PAUSE,
				"timestamp_msec": Time.get_ticks_msec(),
			}
		)
	)

	# Create the LineEdit dynamically
	_line_edit = LineEdit.new()
	_line_edit.placeholder_text = "Describe the issue..."
	_line_edit.size = Vector2(BOX_WIDTH - PADDING * 2, 30)
	_line_edit.position = Vector2(
		(get_viewport_rect().size.x - BOX_WIDTH) / 2.0 + PADDING,
		(get_viewport_rect().size.y - BOX_HEIGHT) / 2.0 + 50
	)
	_line_edit.add_theme_font_size_override("font_size", FONT_SIZE)
	_line_edit.text_submitted.connect(_on_text_submitted)
	add_child(_line_edit)
	_line_edit.grab_focus()


func _on_text_submitted(text: String) -> void:
	_save_report(text)
	_close()
	capture_completed.emit()


func _unhandled_input(event: InputEvent) -> void:
	if not _active:
		return
	if event is InputEventKey and event.pressed and event.keycode == KEY_ESCAPE:
		_close()
		capture_cancelled.emit()
		get_viewport().set_input_as_handled()


func _close() -> void:
	_active = false
	visible = false
	if _line_edit:
		_line_edit.release_focus()
		_line_edit.queue_free()
		_line_edit = null

	_captured_screenshot = null

	# Unpause the simulation
	(
		SimBridge
		. send_input(
			{
				"action": InputMapper.Action.UNPAUSE,
				"timestamp_msec": Time.get_ticks_msec(),
			}
		)
	)


func _save_report(description: String) -> void:
	var tick := GameState.current_tick
	var timestamp := Time.get_datetime_string_from_system().replace(":", "-").replace("T", "_")
	var dir_name := "gauntlet-t%d-%s" % [tick, timestamp]
	var base_path := "user://bug-reports/" + dir_name

	# Ensure directory exists
	var dir_err := DirAccess.make_dir_recursive_absolute(base_path)
	if dir_err != OK:
		push_error("BugReport: failed to create directory %s (error %d)" % [base_path, dir_err])
		return

	var files_saved := 0

	# 1. snapshot.json — single-tick point-in-time (MVP compat, #495)
	var snapshot_path := base_path + "/snapshot.json"
	var snapshot_file := FileAccess.open(snapshot_path, FileAccess.WRITE)
	if snapshot_file:
		snapshot_file.store_string(JSON.stringify(GameState.current_snapshot, "\t"))
		snapshot_file.close()
		files_saved += 1
	else:
		push_error("BugReport: failed to write %s" % snapshot_path)

	# 2. render.txt — simplified client-side text render of snapshot
	var render_path := base_path + "/render.txt"
	var render_file := FileAccess.open(render_path, FileAccess.WRITE)
	if render_file:
		render_file.store_string(_render_snapshot_text())
		render_file.close()
		files_saved += 1
	else:
		push_error("BugReport: failed to write %s" % render_path)

	# 3. description.txt — tester description + metadata
	# Room: uses GameState.room_id (v0.1: room name is the map identifier)
	var desc_path := base_path + "/description.txt"
	var desc_file := FileAccess.open(desc_path, FileAccess.WRITE)
	if desc_file:
		desc_file.store_string("Description: %s\n" % description)
		desc_file.store_string("Tick: %d\n" % tick)
		desc_file.store_string(
			"Room: %s\n" % str(GameState.room_id if GameState.room_id else "none")
		)
		desc_file.store_string("Stance: %s\n" % GameState.player_stance)
		desc_file.store_string("Facing: %s\n" % GameState.player_facing)
		desc_file.store_string("Position: %s\n" % str(GameState.player_position))
		desc_file.store_string("Timestamp: %s\n" % Time.get_datetime_string_from_system())
		desc_file.store_string("RingBufferTicks: %d\n" % _input_count)
		desc_file.close()
		files_saved += 1
	else:
		push_error("BugReport: failed to write %s" % desc_path)

	# 4. inputs.jsonl — last N ticks of PlayerInput (replay-compatible)
	# One JSON array per line. Empty array = idle tick.
	# Compatible with tooling/test-client --replay (replay.rs).
	var inputs_path := base_path + "/inputs.jsonl"
	var inputs_file := FileAccess.open(inputs_path, FileAccess.WRITE)
	if inputs_file:
		inputs_file.store_string(_format_inputs_jsonl())
		inputs_file.close()
		files_saved += 1
	else:
		push_error("BugReport: failed to write %s" % inputs_path)

	# 5. snapshots.jsonl — last N ticks of ObserverSnapshot, oldest to newest.
	var snaps_path := base_path + "/snapshots.jsonl"
	var snaps_file := FileAccess.open(snaps_path, FileAccess.WRITE)
	if snaps_file:
		snaps_file.store_string(_format_snapshots_jsonl())
		snaps_file.close()
		files_saved += 1
	else:
		push_error("BugReport: failed to write %s" % snaps_path)

	# 6. seed.txt — RNG seed for deterministic replay.
	# Server must include "rng_seed" (u64) in ObserverSnapshot for this to be populated.
	# If absent: includes a note on the required protocol change.
	var seed_path := base_path + "/seed.txt"
	var seed_file := FileAccess.open(seed_path, FileAccess.WRITE)
	if seed_file:
		var seed_val: Variant = _get_current_seed()
		seed_file.store_string(str(seed_val) + "\n")
		if seed_val == "unavailable":
			(
				seed_file
				. store_string(
					"# Server protocol change required: add 'rng_seed' (u64) field to ObserverSnapshot.\n"
				)
			)
		seed_file.close()
		files_saved += 1
	else:
		push_error("BugReport: failed to write %s" % seed_path)

	# 7. screenshot.png — viewport capture taken before dialog opened
	if _captured_screenshot:
		var screenshot_path := base_path + "/screenshot.png"
		var img_err := _captured_screenshot.save_png(screenshot_path)
		if img_err == OK:
			files_saved += 1
		else:
			push_error("BugReport: failed to write %s (error %d)" % [screenshot_path, img_err])

	print(
		(
			"BugReport: saved %d/7 files to %s (ring: %d ticks)"
			% [files_saved, base_path, _input_count]
		)
	)


## Simplified client-side text render of the current snapshot.
## MVP version — full fidelity via server's format_snapshot_text() is a stretch goal.
func _render_snapshot_text() -> String:
	var lines: PackedStringArray = []
	lines.append("=== Snapshot t%d ===" % GameState.current_tick)
	lines.append(
		(
			"Player: %s facing %s (%s)"
			% [str(GameState.player_position), GameState.player_facing, GameState.player_stance]
		)
	)

	if GameState.game_time.size() > 0:
		lines.append(
			(
				"Time: day %s, %s, %s"
				% [
					str(GameState.game_time.get("day", "?")),
					str(GameState.game_time.get("day_phase", "?")),
					str(GameState.game_time.get("tick_rate", "?"))
				]
			)
		)

	lines.append("")
	lines.append("Entities (%d):" % GameState.visible_entities.size())
	for entity in GameState.visible_entities:
		var kind_str: String = ""
		if entity.has("kind") and entity.kind is Dictionary:
			kind_str = entity.kind.get("variant", "?")
		elif entity.has("kind") and entity.kind is String:
			kind_str = entity.kind
		var vis: String = entity.get("visibility", "?")
		lines.append(
			(
				"  #%s %s at (%s, %s) [%s]"
				% [
					str(entity.get("entity_id", "?")),
					kind_str,
					str(entity.get("x", "?")),
					str(entity.get("y", "?")),
					vis
				]
			)
		)

	lines.append("")
	lines.append("Visible tiles: %d" % GameState.visible_tiles.size())

	if GameState.current_monologue != null:
		lines.append("Monologue: %s" % str(GameState.current_monologue.get("text", "")))
	if GameState.current_dialogue != null:
		lines.append(
			(
				"Dialogue: %s says '%s'"
				% [
					str(GameState.current_dialogue.get("npc_name", "?")),
					str(GameState.current_dialogue.get("speech", ""))
				]
			)
		)

	return "\n".join(lines)


func _draw() -> void:
	if not _active:
		return
	var viewport_size := get_viewport_rect().size
	# Full-screen dim
	draw_rect(Rect2(Vector2.ZERO, viewport_size), BG_COLOR)

	# Center box
	var box_pos := Vector2(
		(viewport_size.x - BOX_WIDTH) / 2.0, (viewport_size.y - BOX_HEIGHT) / 2.0
	)
	var box_rect := Rect2(box_pos, Vector2(BOX_WIDTH, BOX_HEIGHT))
	draw_rect(box_rect, Color(0.08, 0.08, 0.12, 0.95))
	draw_rect(box_rect, BORDER_COLOR, false, 1.0)

	# Title
	var font := ThemeDB.fallback_font
	draw_string(
		font,
		box_pos + Vector2(PADDING, 24),
		"WRONG — Describe the issue (Enter to save, Esc to cancel):",
		HORIZONTAL_ALIGNMENT_LEFT,
		-1,
		LABEL_FONT_SIZE,
		TEXT_COLOR
	)


# ---------------------------------------------------------------------------
# Public API
# ---------------------------------------------------------------------------


func is_active() -> bool:
	return _active