local M = {}

local OVERLAY_START_RETRY_DELAY_SECONDS = 0.2
local OVERLAY_START_MAX_ATTEMPTS = 6
local AUTO_PLAY_READY_TIMEOUT_SECONDS = 15

function M.create(ctx)
	local mp = ctx.mp
	local opts = ctx.opts
	local state = ctx.state
	local binary = ctx.binary
	local environment = ctx.environment
	local options_helper = ctx.options_helper
	local subminer_log = ctx.log.subminer_log
	local show_osd = ctx.log.show_osd
	local normalize_log_level = ctx.log.normalize_log_level

	local function resolve_visible_overlay_startup()
		local raw_visible_overlay = opts.auto_start_visible_overlay
		if raw_visible_overlay == nil then
			raw_visible_overlay = opts["auto-start-visible-overlay"]
		end
		return options_helper.coerce_bool(raw_visible_overlay, false)
	end

	local function resolve_pause_until_ready()
		local raw_pause_until_ready = opts.auto_start_pause_until_ready
		if raw_pause_until_ready == nil then
			raw_pause_until_ready = opts["auto-start-pause-until-ready"]
		end
		return options_helper.coerce_bool(raw_pause_until_ready, false)
	end

	local function normalize_socket_path(path)
		if type(path) ~= "string" then
			return nil
		end
		local trimmed = path:match("^%s*(.-)%s*$")
		if trimmed == "" then
			return nil
		end
		return trimmed
	end

	local function has_matching_mpv_ipc_socket(target_socket_path)
		local expected_socket = normalize_socket_path(target_socket_path or opts.socket_path)
		local active_socket = normalize_socket_path(mp.get_property("input-ipc-server"))
		if expected_socket == nil or active_socket == nil then
			return false
		end
		return expected_socket == active_socket
	end

	local function resolve_backend(override_backend)
		local selected = override_backend
		if selected == nil or selected == "" then
			selected = opts.backend
		end
		if selected == "auto" then
			return environment.detect_backend()
		end
		return selected
	end

	local function clear_auto_play_ready_timeout()
		local timeout = state.auto_play_ready_timeout
		if timeout and timeout.kill then
			timeout:kill()
		end
		state.auto_play_ready_timeout = nil
	end

	local function disarm_auto_play_ready_gate()
		clear_auto_play_ready_timeout()
		state.auto_play_ready_gate_armed = false
	end

	local function release_auto_play_ready_gate(reason)
		if not state.auto_play_ready_gate_armed then
			return
		end
		disarm_auto_play_ready_gate()
		mp.set_property_native("pause", false)
		show_osd("Subtitle annotations loaded")
		subminer_log("info", "process", "Resuming playback after startup gate: " .. tostring(reason or "ready"))
	end

	local function arm_auto_play_ready_gate()
		if state.auto_play_ready_gate_armed then
			clear_auto_play_ready_timeout()
		end
		state.auto_play_ready_gate_armed = true
		mp.set_property_native("pause", true)
		show_osd("Loading subtitle annotations...")
		subminer_log("info", "process", "Pausing playback until SubMiner overlay/tokenization readiness signal")
		state.auto_play_ready_timeout = mp.add_timeout(AUTO_PLAY_READY_TIMEOUT_SECONDS, function()
			if not state.auto_play_ready_gate_armed then
				return
			end
			subminer_log(
				"warn",
				"process",
				"Startup readiness signal timed out; resuming playback to avoid stalled pause"
			)
			release_auto_play_ready_gate("timeout")
		end)
	end

	local function notify_auto_play_ready()
		release_auto_play_ready_gate("tokenization-ready")
	end

	local function build_command_args(action, overrides)
		overrides = overrides or {}
		local args = { state.binary_path }

		table.insert(args, "--" .. action)
		local log_level = normalize_log_level(overrides.log_level or opts.log_level)
		if log_level ~= "info" then
			table.insert(args, "--log-level")
			table.insert(args, log_level)
		end

		if action == "start" then
			local backend = resolve_backend(overrides.backend)
			if backend and backend ~= "" then
				table.insert(args, "--backend")
				table.insert(args, backend)
			end

			local socket_path = overrides.socket_path or opts.socket_path
			table.insert(args, "--socket")
			table.insert(args, socket_path)

			-- Keep auto-start --start requests idempotent for second-instance handling.
			-- Visibility is applied as a separate control command after startup.
			if overrides.auto_start_trigger ~= true then
				local should_show_visible = resolve_visible_overlay_startup()
				if should_show_visible then
					table.insert(args, "--show-visible-overlay")
				else
					table.insert(args, "--hide-visible-overlay")
				end
			end
		end

		return args
	end

	local function run_control_command_async(action, overrides, callback)
		local args = build_command_args(action, overrides)
		subminer_log("debug", "process", "Control command: " .. table.concat(args, " "))
		mp.command_native_async({
			name = "subprocess",
			args = args,
			playback_only = false,
			capture_stdout = true,
			capture_stderr = true,
		}, function(success, result, error)
			local ok = success and (result == nil or result.status == 0)
			if callback then
				callback(ok, result, error)
			end
		end)
	end

	local function parse_start_script_message_overrides(...)
		local overrides = {}
		for i = 1, select("#", ...) do
			local token = select(i, ...)
			if type(token) == "string" and token ~= "" then
				local key, value = token:match("^([%w_%-]+)=(.+)$")
				if key and value then
					local normalized_key = key:lower()
					if normalized_key == "backend" then
						local backend = value:lower()
						if backend == "auto" or backend == "hyprland" or backend == "sway" or backend == "x11" or backend == "macos" then
							overrides.backend = backend
						end
					elseif normalized_key == "socket" or normalized_key == "socket_path" then
						overrides.socket_path = value
					elseif normalized_key == "texthooker" or normalized_key == "texthooker_enabled" then
						local parsed = options_helper.coerce_bool(value, nil)
						if parsed ~= nil then
							overrides.texthooker_enabled = parsed
						end
					elseif normalized_key == "log-level" or normalized_key == "log_level" then
						overrides.log_level = normalize_log_level(value)
					end
				end
			end
		end
		return overrides
	end

	local function build_texthooker_args()
		local args = { state.binary_path, "--texthooker", "--port", tostring(opts.texthooker_port) }
		local log_level = normalize_log_level(opts.log_level)
		if log_level ~= "info" then
			table.insert(args, "--log-level")
			table.insert(args, log_level)
		end
		return args
	end

	local function ensure_texthooker_running(callback)
		if not opts.texthooker_enabled then
			callback()
			return
		end

		if state.texthooker_running then
			callback()
			return
		end

		local args = build_texthooker_args()
		subminer_log("info", "texthooker", "Starting texthooker process: " .. table.concat(args, " "))
		state.texthooker_running = true

		mp.command_native_async({
			name = "subprocess",
			args = args,
			playback_only = false,
			capture_stdout = true,
			capture_stderr = true,
		}, function(success, result, error)
			if not success or (result and result.status ~= 0) then
				state.texthooker_running = false
				subminer_log(
					"warn",
					"texthooker",
					"Texthooker process exited unexpectedly: " .. (error or (result and result.stderr) or "unknown error")
				)
			end
		end)

		-- Start overlay immediately; overlay start path retries on readiness failures.
		callback()
	end

	local function start_overlay(overrides)
		overrides = overrides or {}

		if not binary.ensure_binary_available() then
			subminer_log("error", "binary", "SubMiner binary not found")
			show_osd("Error: binary not found")
			return
		end

		if state.overlay_running then
			if overrides.auto_start_trigger == true then
				subminer_log("debug", "process", "Auto-start ignored because overlay is already running")
				return
			end
			subminer_log("info", "process", "Overlay already running")
			show_osd("Already running")
			return
		end

		local texthooker_enabled = overrides.texthooker_enabled
		if texthooker_enabled == nil then
			texthooker_enabled = opts.texthooker_enabled
		end
		local socket_path = overrides.socket_path or opts.socket_path
		local should_pause_until_ready = (
			overrides.auto_start_trigger == true
			and resolve_visible_overlay_startup()
			and resolve_pause_until_ready()
			and has_matching_mpv_ipc_socket(socket_path)
		)
		if should_pause_until_ready then
			arm_auto_play_ready_gate()
		else
			disarm_auto_play_ready_gate()
		end

		local function launch_overlay_with_retry(attempt)
			local args = build_command_args("start", overrides)
			if attempt == 1 then
				subminer_log("info", "process", "Starting overlay: " .. table.concat(args, " "))
			else
				subminer_log(
					"warn",
					"process",
					"Retrying overlay start (attempt " .. tostring(attempt) .. "): " .. table.concat(args, " ")
				)
			end

			if attempt == 1 then
				show_osd("Starting...")
			end
			state.overlay_running = true

			mp.command_native_async({
				name = "subprocess",
				args = args,
				playback_only = false,
				capture_stdout = true,
				capture_stderr = true,
			}, function(success, result, error)
				if not success or (result and result.status ~= 0) then
					local reason = error or (result and result.stderr) or "unknown error"
					if attempt < OVERLAY_START_MAX_ATTEMPTS then
						mp.add_timeout(OVERLAY_START_RETRY_DELAY_SECONDS, function()
							launch_overlay_with_retry(attempt + 1)
						end)
						return
					end

					state.overlay_running = false
					subminer_log("error", "process", "Overlay start failed after retries: " .. reason)
					show_osd("Overlay start failed")
					release_auto_play_ready_gate("overlay-start-failed")
					return
				end

				if overrides.auto_start_trigger == true then
					local visibility_action = resolve_visible_overlay_startup()
							and "show-visible-overlay"
						or "hide-visible-overlay"
					run_control_command_async(visibility_action, {
						log_level = overrides.log_level,
					})
				end

			end)
		end

		if texthooker_enabled then
			ensure_texthooker_running(function()
				launch_overlay_with_retry(1)
			end)
		else
			launch_overlay_with_retry(1)
		end
	end

	local function start_overlay_from_script_message(...)
		local overrides = parse_start_script_message_overrides(...)
		start_overlay(overrides)
	end

	local function stop_overlay()
		if not binary.ensure_binary_available() then
			subminer_log("error", "binary", "SubMiner binary not found")
			show_osd("Error: binary not found")
			return
		end

		run_control_command_async("stop", nil, function(ok, result)
			if ok then
				subminer_log("info", "process", "Overlay stopped")
			else
				subminer_log(
					"warn",
					"process",
					"Stop command returned non-zero status: " .. tostring(result and result.status or "unknown")
				)
			end
		end)

		state.overlay_running = false
		state.texthooker_running = false
		disarm_auto_play_ready_gate()
		show_osd("Stopped")
	end

	local function toggle_overlay()
		if not binary.ensure_binary_available() then
			subminer_log("error", "binary", "SubMiner binary not found")
			show_osd("Error: binary not found")
			return
		end

		run_control_command_async("toggle", nil, function(ok)
			if not ok then
				subminer_log("warn", "process", "Toggle command failed")
				show_osd("Toggle failed")
			end
		end)
	end

	local function open_options()
		if not binary.ensure_binary_available() then
			subminer_log("error", "binary", "SubMiner binary not found")
			show_osd("Error: binary not found")
			return
		end

		run_control_command_async("settings", nil, function(ok)
			if ok then
				subminer_log("info", "process", "Options window opened")
				show_osd("Options opened")
			else
				subminer_log("warn", "process", "Failed to open options")
				show_osd("Failed to open options")
			end
		end)
	end

	local function restart_overlay()
		if not binary.ensure_binary_available() then
			subminer_log("error", "binary", "SubMiner binary not found")
			show_osd("Error: binary not found")
			return
		end

		subminer_log("info", "process", "Restarting overlay...")
		show_osd("Restarting...")

		run_control_command_async("stop", nil, function()
			state.overlay_running = false
			state.texthooker_running = false
			disarm_auto_play_ready_gate()

			ensure_texthooker_running(function()
				local start_args = build_command_args("start")
				subminer_log("info", "process", "Starting overlay: " .. table.concat(start_args, " "))

				state.overlay_running = true
				mp.command_native_async({
					name = "subprocess",
					args = start_args,
					playback_only = false,
					capture_stdout = true,
					capture_stderr = true,
				}, function(success, result, error)
					if not success or (result and result.status ~= 0) then
						state.overlay_running = false
						subminer_log(
							"error",
							"process",
							"Overlay start failed: " .. (error or (result and result.stderr) or "unknown error")
						)
						show_osd("Restart failed")
					else
						show_osd("Restarted successfully")
					end
				end)
			end)
		end)
	end

	local function check_status()
		if not binary.ensure_binary_available() then
			show_osd("Status: binary not found")
			return
		end

		local status = state.overlay_running and "running" or "stopped"
		show_osd("Status: overlay is " .. status)
		subminer_log("info", "process", "Status check: overlay is " .. status)
	end

	local function check_binary_available()
		return binary.ensure_binary_available()
	end

	return {
		build_command_args = build_command_args,
		has_matching_mpv_ipc_socket = has_matching_mpv_ipc_socket,
		run_control_command_async = run_control_command_async,
		parse_start_script_message_overrides = parse_start_script_message_overrides,
		ensure_texthooker_running = ensure_texthooker_running,
		start_overlay = start_overlay,
		start_overlay_from_script_message = start_overlay_from_script_message,
		stop_overlay = stop_overlay,
		toggle_overlay = toggle_overlay,
		open_options = open_options,
		restart_overlay = restart_overlay,
		check_status = check_status,
		check_binary_available = check_binary_available,
		notify_auto_play_ready = notify_auto_play_ready,
		disarm_auto_play_ready_gate = disarm_auto_play_ready_gate,
	}
end

return M