const std = @import("std");const app_worker_runtime = @import("app_worker_runtime.zig");const image_attachments = @import("../images/image_attachments.zig");const tool_result_errors = @import("../tooling/tool_result_errors.zig");const task_helpers = @import("../tasks/task_helpers.zig");const types = @import("../shared/types.zig");const worker_runtime = @import("../agent/worker_runtime.zig"); pub fn Runtime(comptime App: type) type {    return struct {        pub fn startWorkerThread(app: *App) !void {            app.worker_thread = try std.Thread.spawn(.{}, workerThreadMain, .{app});        }         /// Starts one queued prompt on a single-threaded host. Prompt admission        /// is presented before agent work can suspend on host transport.        pub fn processNextCooperativePrompt(            app: *App,            on_task_completion: *const fn (*anyopaque, task_helpers.TaskCompletion) void,            event_handlers: app_worker_runtime.WorkerEventHandlers,            flush_frame: *const fn (*App) anyerror!void,        ) !void {            const job = (try app.worker.tryTakeNextPrompt(std.heap.c_allocator)) orelse return;            defer worker_runtime.freeQueuedPrompt(std.heap.c_allocator, job);             try app_worker_runtime.Runtime(App).tick(                app,                on_task_completion,                event_handlers,            );            try flush_frame(app);             app.processQueuedPrompt(job) catch |err| {                if (err != error.RouteRecoveryStopped) {                    const body = try formatErrorBody(std.heap.c_allocator, "request failed", err);                    defer std.heap.c_allocator.free(body);                    try app.worker.pushEvent(std.heap.c_allocator, .{ .error_text = .{                        .topic = "system",                        .tone = .@"error",                        .body = body,                    } });                }            };            app.worker.finishProcessing();        }         pub fn formatToolExecutionError(alloc: std.mem.Allocator, tool_name: []const u8, err: anyerror) ![]u8 {            const error_detail = detailedErrorSummary(err);            const details: []const tool_result_errors.Detail = if (error_detail) |detail|                &[_]tool_result_errors.Detail{                    .{ .name = "error", .value = .{ .string = @errorName(err) } },                    .{ .name = "detail", .value = .{ .string = detail } },                }            else                &[_]tool_result_errors.Detail{                    .{ .name = "error", .value = .{ .string = @errorName(err) } },                };             return tool_result_errors.toolExecutionFailureJson(alloc, .{                .tool_name = tool_name,                .message = if (error_detail != null) "Tool execution failed while parsing or preparing data" else "Tool execution failed",                .details = details,                .suggestion = suggestionForError(err),            });        }         fn detailedErrorSummary(err: anyerror) ?[]const u8 {            return switch (err) {                error.StreamInterrupted => "provider response ended before completion",                error.UnexpectedEndOfInput => "incomplete JSON or internal response while parsing data",                error.SyntaxError => "invalid JSON syntax while parsing data",                error.MissingField => "required field missing while parsing data",                error.InvalidEnumTag => "invalid enum value while parsing data",                error.UnknownField => "unexpected field while parsing data",                error.ImageTooLarge => image_attachments.image_too_large_notice,                error.McpInputTimedOut => tool_result_errors.executionErrorMessage(err),                else => null,            };        }         fn suggestionForError(err: anyerror) ?[]const u8 {            return switch (err) {                error.UnexpectedEndOfInput, error.SyntaxError => "Check that the tool arguments are valid JSON and retry with corrected input.",                error.MissingField => "Add the required input field named by the tool schema, then retry.",                error.InvalidEnumTag, error.UnknownField => "Compare the input fields with the tool schema and retry with supported values.",                error.ImageTooLarge => "Use a smaller image or reduce the image before retrying.",                error.McpInputTimedOut => tool_result_errors.executionErrorSuggestion(err),                else => null,            };        }         fn formatErrorBody(alloc: std.mem.Allocator, context: []const u8, err: anyerror) ![]u8 {            switch (err) {                error.ConnectionSetupTimedOut => return alloc.dupe(u8, "Connection setup timed out after 30 seconds."),                error.TlsInitializationFailed => return alloc.dupe(u8, "Connection setup failed: TLS could not be initialized."),                else => {},            }            if (detailedErrorSummary(err)) |detail| {                return std.fmt.allocPrint(alloc, "{s}: {s} ({s})", .{ context, detail, @errorName(err) });            }             return std.fmt.allocPrint(alloc, "{s}: {s}", .{ context, @errorName(err) });        }         fn workerThreadMain(app: *App) void {            workerLoop(app) catch |err| {                const body = formatErrorBody(std.heap.c_allocator, "worker loop crashed", err) catch return;                defer std.heap.c_allocator.free(body);                app.worker.pushEvent(std.heap.c_allocator, .{ .error_text = .{                    .topic = "system",                    .tone = .@"error",                    .body = body,                } }) catch return;            };        }         fn workerLoop(app: *App) !void {            while (true) {                const job = (try app.worker.waitAndTakeNextPrompt(std.heap.c_allocator)) orelse return;                 defer worker_runtime.freeQueuedPrompt(std.heap.c_allocator, job);                app.processQueuedPrompt(job) catch |err| {                    if (err != error.RouteRecoveryStopped) {                        const body = try formatErrorBody(std.heap.c_allocator, "request failed", err);                        defer std.heap.c_allocator.free(body);                        try app.worker.pushEvent(std.heap.c_allocator, .{ .error_text = .{                            .topic = "system",                            .tone = .@"error",                            .body = body,                        } });                    }                };                 app.worker.finishProcessing();            }        }    };} const DummyApp = struct {    worker: ?void = null,    worker_thread: ?std.Thread = null,}; test "formatToolExecutionError includes tool name" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);    const msg = try Rt.formatToolExecutionError(alloc, "write_file", error.FileNotFound);    defer alloc.free(msg);    try std.testing.expect(std.mem.find(u8, msg, "write_file") != null);    try std.testing.expect(std.mem.find(u8, msg, "FileNotFound") != null);    try std.testing.expect(tool_result_errors.isToolExecutionFailedOutput(msg));} test "formatToolExecutionError includes detail for SyntaxError" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);    const msg = try Rt.formatToolExecutionError(alloc, "edit_file", error.SyntaxError);    defer alloc.free(msg);    try std.testing.expect(std.mem.find(u8, msg, "invalid JSON syntax") != null);    try std.testing.expect(std.mem.find(u8, msg, "edit_file") != null);} test "formatErrorBody describes an interrupted provider response without presentation bytes" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);    const body = try Rt.formatErrorBody(alloc, "request failed", error.StreamInterrupted);    defer alloc.free(body);     try std.testing.expect(std.mem.find(u8, body, "provider response ended before completion") != null);    try std.testing.expect(std.mem.find(u8, body, "StreamInterrupted") != null);    try std.testing.expect(std.mem.find(u8, body, "\x1b[") == null);    try std.testing.expect(!std.mem.endsWith(u8, body, "\n"));} test "formatErrorBody describes terminal connection setup failures plainly" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);     const timeout = try Rt.formatErrorBody(alloc, "request failed", error.ConnectionSetupTimedOut);    defer alloc.free(timeout);    try std.testing.expectEqualStrings("Connection setup timed out after 30 seconds.", timeout);     const tls = try Rt.formatErrorBody(alloc, "request failed", error.TlsInitializationFailed);    defer alloc.free(tls);    try std.testing.expectEqualStrings("Connection setup failed: TLS could not be initialized.", tls);     for ([_][]const u8{ timeout, tls }) |body| {        try std.testing.expect(std.mem.find(u8, body, "\x1b[") == null);        try std.testing.expect(!std.mem.endsWith(u8, body, "\n"));        try std.testing.expect(std.mem.find(u8, body, "ConnectionSetupTimedOut") == null);        try std.testing.expect(std.mem.find(u8, body, "TlsInitializationFailed") == null);    }     const unrelated_timeout = try Rt.formatErrorBody(alloc, "request failed", error.ConnectionTimedOut);    defer alloc.free(unrelated_timeout);    try std.testing.expectEqualStrings("request failed: ConnectionTimedOut", unrelated_timeout);} test "formatToolExecutionError includes detail for MissingField" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);    const msg = try Rt.formatToolExecutionError(alloc, "read_file", error.MissingField);    defer alloc.free(msg);    try std.testing.expect(std.mem.find(u8, msg, "required field missing") != null);} test "formatToolExecutionError includes detail for ImageTooLarge" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);    const msg = try Rt.formatToolExecutionError(alloc, "image_tool", error.ImageTooLarge);    defer alloc.free(msg);    try std.testing.expect(std.mem.find(u8, msg, "image exceeds") != null);} test "formatToolExecutionError generic error has no detail" {    const alloc = std.testing.allocator;    const Rt = Runtime(DummyApp);    const msg = try Rt.formatToolExecutionError(alloc, "run_command", error.OutOfMemory);    defer alloc.free(msg);    try std.testing.expect(tool_result_errors.isToolExecutionFailedOutput(msg));    try std.testing.expect(std.mem.find(u8, msg, "run_command") != null);    try std.testing.expect(std.mem.find(u8, msg, "OutOfMemory") != null);} const TestWorkerApp = struct {    worker: worker_runtime.WorkerRuntime = .{},    worker_thread: ?std.Thread = null,    first_process_error: ?anyerror = null,    shutdown_after_count: usize = 1,    processed_count: usize = 0,    successful_count: usize = 0,    saw_recovery_prompt: bool = false,     fn deinit(self: *TestWorkerApp) void {        if (self.worker_thread) |thread| {            self.worker.requestShutdown();            thread.join();            self.worker_thread = null;        }        self.worker.deinit(std.heap.c_allocator);    }     fn processQueuedPrompt(self: *TestWorkerApp, job: worker_runtime.QueuedPrompt) !void {        self.processed_count += 1;        if (self.processed_count >= self.shutdown_after_count) self.worker.requestShutdown();        if (self.processed_count == 1) {            if (self.first_process_error) |err| return err;        }        self.successful_count += 1;        self.saw_recovery_prompt = std.mem.eql(u8, job.prompt, "recovery");    }}; fn makeQueuedPrompt(alloc: std.mem.Allocator, text: []const u8) !worker_runtime.QueuedPrompt {    return .{        .prompt = try alloc.dupe(u8, text),        .images = &.{},        .model = try alloc.dupe(u8, "test-model"),        .api_key = try alloc.dupe(u8, "test-key"),        .permission_mode = .ask,        .history = try alloc.alloc(types.HistoryTurn, 0),        .grants = try alloc.alloc(types.PermissionGrant, 0),    };} fn queuePrompt(app: *TestWorkerApp, text: []const u8) !void {    const prompt = try makeQueuedPrompt(std.heap.c_allocator, text);    errdefer worker_runtime.freeQueuedPrompt(std.heap.c_allocator, prompt);    try app.worker.enqueuePrompt(std.heap.c_allocator, prompt);} test "startWorkerThread processes queued prompt and exits on shutdown" {    var app = TestWorkerApp{};    defer app.deinit();     try Runtime(TestWorkerApp).startWorkerThread(&app);    try queuePrompt(&app, "hello");     const thread = app.worker_thread.?;    thread.join();    app.worker_thread = null;     try std.testing.expectEqual(@as(usize, 1), app.processed_count);    const snapshot = try app.worker.snapshotState(std.testing.allocator);    defer snapshot.deinit(std.testing.allocator);    try std.testing.expect(!snapshot.processing);    try std.testing.expectEqual(@as(usize, 0), snapshot.queued_count);} test "worker thread reports queued prompt failures as worker events" {    var app = TestWorkerApp{ .first_process_error = error.SyntaxError };    defer app.deinit();     try Runtime(TestWorkerApp).startWorkerThread(&app);    try queuePrompt(&app, "bad json");     const thread = app.worker_thread.?;    thread.join();    app.worker_thread = null;     var events = app.worker.takeEvents();    defer events.deinit(std.heap.c_allocator);    defer for (events.items) |event| worker_runtime.freeWorkerEvent(std.heap.c_allocator, event);     var saw_error = false;    for (events.items) |event| {        switch (event) {            .error_text => |notice| {                saw_error = true;                try std.testing.expectEqualStrings("system", notice.topic);                try std.testing.expectEqual(types.NoticeTone.@"error", notice.tone);                try std.testing.expect(std.mem.find(u8, notice.body, "request failed") != null);                try std.testing.expect(std.mem.find(u8, notice.body, "invalid JSON syntax") != null);                try std.testing.expect(std.mem.find(u8, notice.body, "SyntaxError") != null);            },            else => {},        }    }     try std.testing.expect(saw_error);} test "worker continues after project context selector failures" {    const errors = [_]anyerror{        error.OutOfMemory,        error.NoSpaceLeft,        error.WriteFailed,    };     for (errors) |expected_error| {        var app = TestWorkerApp{            .first_process_error = expected_error,            .shutdown_after_count = 2,        };        defer app.deinit();         try queuePrompt(&app, "selector failure");        try queuePrompt(&app, "recovery");        try Runtime(TestWorkerApp).startWorkerThread(&app);         const thread = app.worker_thread.?;        thread.join();        app.worker_thread = null;         try std.testing.expectEqual(@as(usize, 2), app.processed_count);        try std.testing.expectEqual(@as(usize, 1), app.successful_count);        try std.testing.expect(app.saw_recovery_prompt);         const snapshot = try app.worker.snapshotState(std.testing.allocator);        defer snapshot.deinit(std.testing.allocator);        try std.testing.expect(!snapshot.processing);        try std.testing.expectEqual(@as(usize, 0), snapshot.queued_count);         var events = app.worker.takeEvents();        defer events.deinit(std.heap.c_allocator);        defer for (events.items) |event| worker_runtime.freeWorkerEvent(std.heap.c_allocator, event);         var error_count: usize = 0;        for (events.items) |event| switch (event) {            .error_text => |notice| {                error_count += 1;                try std.testing.expect(std.mem.find(u8, notice.body, "request failed") != null);                try std.testing.expect(std.mem.find(u8, notice.body, @errorName(expected_error)) != null);            },            else => {},        };        try std.testing.expectEqual(@as(usize, 1), error_count);    }}