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const std = @import("std");
const zqlite = @import("zqlite");
const build_options = @import("build_options");
const testing = std.testing;

const StderrReadResult = union(enum) {
    data: []const u8,
    would_block,
    eof,
};

const NonBlockingStderr = struct {
    file: std.fs.File,

    fn init(stderr: std.fs.File) !NonBlockingStderr {
        // Make stderr non-blocking
        const flags = try std.posix.fcntl(stderr.handle, std.posix.F.GETFL, 0);
        _ = try std.posix.fcntl(stderr.handle, std.posix.F.SETFL, flags | 0x800); // O_NONBLOCK = 0x800

        return NonBlockingStderr{ .file = stderr };
    }

    fn readChunk(self: NonBlockingStderr, buffer: []u8) !StderrReadResult {
        const bytes_read = self.file.read(buffer) catch |err| switch (err) {
            error.WouldBlock => return .would_block,
            else => return err,
        };

        if (bytes_read == 0) return .eof;

        return .{ .data = buffer[0..bytes_read] };
    }
};

fn readCurrentStderr(allocator: std.mem.Allocator, child_process: *std.process.Child) ![]const u8 {
    if (child_process.stderr) |stderr| {
        const nb_stderr = NonBlockingStderr.init(stderr) catch |err| {
            std.debug.print("Failed to make stderr non-blocking: {}\n", .{err});
            return &[_]u8{};
        };

        var stderr_buffer = std.ArrayList(u8).init(allocator);
        defer stderr_buffer.deinit();
        var read_buffer: [1024]u8 = undefined;

        while (true) {
            switch (try nb_stderr.readChunk(&read_buffer)) {
                .data => |chunk| {
                    stderr_buffer.appendSlice(chunk) catch break;
                },
                .would_block, .eof => break,
            }
        }

        return stderr_buffer.toOwnedSlice() catch &[_]u8{};
    }
    return &[_]u8{};
}


fn testFileLifecycle(exe_path: []const u8, impl_name: []const u8) !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();
    var arena = std.heap.ArenaAllocator.init(gpa.allocator());
    defer arena.deinit();
    const allocator = arena.allocator();

    std.debug.print("Testing {s} implementation\n", .{impl_name});

    // Create temporary mount point
    var tmp_dir = std.testing.tmpDir(.{});
    defer tmp_dir.cleanup();

    // Create temporary database file
    const test_db_file = try tmp_dir.dir.createFile("test.db", .{});
    test_db_file.close();

    const test_db_path = try tmp_dir.dir.realpathAlloc(allocator, "test.db");

    // Create temporary mount point
    try tmp_dir.dir.makeDir("mount");
    const mount_point = try tmp_dir.dir.realpathAlloc(allocator, "mount");

    // Start sqlitefs process
    var child_process = std.process.Child.init(&.{ exe_path, "-f", mount_point, test_db_path }, allocator);
    child_process.stdout_behavior = .Pipe;
    child_process.stderr_behavior = .Pipe;

    try child_process.spawn();
    defer _ = child_process.kill() catch {};
    errdefer {
        // Clean up FUSE mount point on error
        var cleanup_mount = std.process.Child.init(&.{ "fusermount", "-u", mount_point }, allocator);
        if (cleanup_mount.spawnAndWait()) |cleanup_result| {
            if (cleanup_result.Exited != 0) {
                std.debug.print("Warning: fusermount cleanup failed with exit code: {}\n", .{cleanup_result.Exited});
            }
        } else |err| {
            std.debug.print("Warning: Failed to spawn fusermount cleanup: {}\n", .{err});
        }
    }

    // Wait for FUSE initialization with timeout
    const init_timeout_ms = 5000;
    const start_time = std.time.milliTimestamp();
    var fuse_initialized = false;
    var all_stderr = std.ArrayList(u8).init(allocator);
    defer all_stderr.deinit();

    if (child_process.stderr) |stderr| {
        const nb_stderr = NonBlockingStderr.init(stderr) catch |err| {
            std.debug.print("Failed to make stderr non-blocking: {}\n", .{err});
            return error.StderrConfigError;
        };

        while (std.time.milliTimestamp() - start_time < init_timeout_ms) {
            var read_buffer: [256]u8 = undefined;
            switch (try nb_stderr.readChunk(&read_buffer)) {
                .data => |chunk| {
                    all_stderr.appendSlice(chunk) catch break;

                    // Check if we've seen the init message
                    if (std.mem.indexOf(u8, all_stderr.items, "FUSE_INIT_COMPLETE")) |_| {
                        fuse_initialized = true;
                        break;
                    }
                },
                .would_block => {
                    // No data available, sleep and try again
                    std.time.sleep(50 * std.time.ns_per_ms);
                    continue;
                },
                .eof => {
                    std.debug.print("Stderr EOF during init\n", .{});
                    break;
                },
            }
        }

        std.debug.print("Child stderr output: {s}\n", .{all_stderr.items});
    }

    if (!fuse_initialized) {
        std.debug.print("FUSE initialization timed out after {}ms\n", .{init_timeout_ms});
        return error.FuseInitTimeout;
    }

    std.debug.print("FUSE initialization completed successfully\n", .{});

    // Check if our specific mount point is actually mounted
    var mount_check = std.process.Child.init(&.{"mount"}, allocator);
    mount_check.stdout_behavior = .Pipe;
    mount_check.stderr_behavior = .Pipe;

    _ = mount_check.spawnAndWait() catch {};
    if (mount_check.stdout) |stdout| {
        const mount_output = try stdout.readToEndAlloc(allocator, 4096);

        // Filter for our specific mount point
        if (std.mem.indexOf(u8, mount_output, mount_point)) |_| {
            std.debug.print("Mount point {s} is mounted\n", .{mount_point});
        } else {
            std.debug.print("Mount point {s} is NOT mounted\n", .{mount_point});
        }

        // Show all mounts for debugging
        std.debug.print("All mounts:\n{s}\n", .{mount_output});
    }

    // Test: Create a file through the filesystem
    const test_file_path = try std.fs.path.join(allocator, &.{ mount_point, "test.txt" });

    const test_content = "Hello, SQLiteFS!";

    // Check if mount point is accessible
    std.debug.print("Attempting to write to: {s}\n", .{test_file_path});
    var mount_dir = std.fs.cwd().openDir(mount_point, .{}) catch |err| {
        std.debug.print("Cannot open mount directory {s}: {}\n", .{ mount_point, err });
        return err;
    };
    mount_dir.close();

    // Write file through filesystem
    std.fs.cwd().writeFile(.{ .sub_path = test_file_path, .data = test_content }) catch |err| {
        std.debug.print("Failed to write file {s}: {}\n", .{ test_file_path, err });
        return err;
    };

    std.debug.print("Successfully wrote file {s}\n", .{test_file_path});

    // Immediately try to read the file back to verify FUSE is working
    const immediate_read = std.fs.cwd().readFileAlloc(allocator, test_file_path, 1024) catch |err| {
        std.debug.print("Cannot read file back immediately: {}\n", .{err});
        std.debug.print("This suggests FUSE mount is not working\n", .{});
        return err;
    };
    std.debug.print("Immediate read back successful, content: '{s}'\n", .{immediate_read});

    // Verify file exists in database
    const db_path_z = try allocator.dupeZ(u8, test_db_path);

    const conn = try zqlite.Conn.init(db_path_z, zqlite.c.SQLITE_OPEN_READONLY);
    errdefer {
        // Create persistent copy of database for debugging
        const debug_db_path = "/tmp/sqlitefs_test_failure.db";
        conn.exec("VACUUM INTO ?", .{debug_db_path}) catch {};

        // Read any remaining stderr output for debugging
        const current_stderr = readCurrentStderr(allocator, &child_process) catch &[_]u8{};

        std.debug.print("Error opening database. Debug copy saved to: {s}\n", .{debug_db_path});
        std.debug.print("Additional stderr output: {s}\n", .{current_stderr});
    }
    defer conn.close();

    var rows = try conn.rows("SELECT filecontent FROM files WHERE filename = ?", .{"test.txt"});
    defer rows.deinit();

    if (rows.next()) |row| {
        const result = row.get([]const u8, 0);
        try testing.expectEqualStrings(test_content, result);
    } else {
        // Create persistent copy of database for debugging
        const debug_db_path = "/tmp/sqlitefs_test_failure.db";
        conn.exec("VACUUM INTO ?", .{debug_db_path}) catch {};

        // Read any remaining stderr output for debugging
        const current_stderr = readCurrentStderr(allocator, &child_process) catch &[_]u8{};

        std.debug.print("No row found for 'test.txt'. Debug copy saved to: {s}\n", .{debug_db_path});
        std.debug.print("Additional stderr output: {s}\n", .{current_stderr});
        try testing.expect(false); // No row found
    }

    // Verify file can be read back through filesystem
    const read_content = try std.fs.cwd().readFileAlloc(allocator, test_file_path, 1024);

    try testing.expectEqualStrings(test_content, read_content);

    // Test: Delete the file
    std.debug.print("Testing file deletion...\n", .{});
    std.fs.cwd().deleteFile(test_file_path) catch |err| {
        std.debug.print("Failed to delete file {s}: {}\n", .{ test_file_path, err });
        return err;
    };

    std.debug.print("File deleted successfully\n", .{});

    // Verify file no longer exists in filesystem
    if (std.fs.cwd().readFileAlloc(allocator, test_file_path, 1024)) |_| {
        std.debug.print("ERROR: File still readable after deletion!\n", .{});
        try testing.expect(false);
    } else |err| switch (err) {
        error.FileNotFound => {
            std.debug.print("Confirmed: File not found in filesystem after deletion\n", .{});
        },
        else => {
            std.debug.print("Unexpected error reading deleted file: {}\n", .{err});
            return err;
        },
    }

    // Verify file was removed from database (while FUSE process is still running)
    const db_path_z_concurrent = try allocator.dupeZ(u8, test_db_path);
    const conn_concurrent = try zqlite.Conn.init(db_path_z_concurrent, zqlite.c.SQLITE_OPEN_READONLY);
    defer conn_concurrent.close();

    var rows_after_delete_concurrent = try conn_concurrent.rows("SELECT filename FROM files WHERE filename = ?", .{"test.txt"});
    defer rows_after_delete_concurrent.deinit();

    if (rows_after_delete_concurrent.next()) |_| {
        std.debug.print("ERROR: File still exists in database after deletion (concurrent check)!\n", .{});
        try testing.expect(false);
    } else {
        std.debug.print("Confirmed: File removed from database after deletion (concurrent check)\n", .{});
    }

    // Kill the child process
    _ = child_process.kill() catch {};
    _ = try child_process.wait();


    // Clean up FUSE mount point (especially important for Haskell implementation)
    var fusermount_cleanup = std.process.Child.init(&.{ "fusermount", "-u", mount_point }, allocator);
    if (fusermount_cleanup.spawnAndWait()) |cleanup_result| {
        if (cleanup_result.Exited != 0) {
            std.debug.print("Warning: fusermount cleanup failed with exit code: {}\n", .{cleanup_result.Exited});
        }
    } else |err| {
        std.debug.print("Warning: Failed to spawn fusermount cleanup: {}\n", .{err});
    }
}

test "file lifecycle (zig)" {
    const exe_path = build_options.sqlitefs_zig_exe_path;
    try testFileLifecycle(exe_path, "Zig");
}

test "file lifecycle (haskell)" {
    const haskell_exe_path = build_options.sqlitefs_haskell_exe_path;
    try testFileLifecycle(haskell_exe_path, "Haskell");
}