/// Integration tests for ZynamoDB
const std = @import("std");

// Import modules from main source
const rocksdb = @import("../src/rocksdb.zig");
const storage = @import("../src/dynamodb/storage.zig");
const types = @import("../src/dynamodb/types.zig");

test "integration: full table lifecycle" {
    const allocator = std.testing.allocator;

    // Setup
    const path = "/tmp/test_integration_lifecycle";
    defer std.fs.deleteTreeAbsolute(path) catch {};

    var engine = try storage.StorageEngine.init(allocator, path);
    defer engine.deinit();

    // Create table
    const key_schema = [_]types.KeySchemaElement{
        .{ .attribute_name = "pk", .key_type = .HASH },
    };
    const attr_defs = [_]types.AttributeDefinition{
        .{ .attribute_name = "pk", .attribute_type = .S },
    };

    const desc = try engine.createTable("Users", &key_schema, &attr_defs);
    try std.testing.expectEqualStrings("Users", desc.table_name);
    try std.testing.expectEqual(types.TableStatus.ACTIVE, desc.table_status);

    // Put items
    try engine.putItem("Users", "{\"pk\":{\"S\":\"user1\"},\"name\":{\"S\":\"Alice\"}}");
    try engine.putItem("Users", "{\"pk\":{\"S\":\"user2\"},\"name\":{\"S\":\"Bob\"}}");
    try engine.putItem("Users", "{\"pk\":{\"S\":\"user3\"},\"name\":{\"S\":\"Charlie\"}}");

    // Get item
    const item = try engine.getItem("Users", "{\"pk\":{\"S\":\"user1\"}}");
    try std.testing.expect(item != null);
    defer allocator.free(item.?);

    // Scan
    const all_items = try engine.scan("Users", null);
    defer {
        for (all_items) |i| allocator.free(i);
        allocator.free(all_items);
    }
    try std.testing.expectEqual(@as(usize, 3), all_items.len);

    // Delete item
    try engine.deleteItem("Users", "{\"pk\":{\"S\":\"user2\"}}");

    // Verify deletion
    const after_delete = try engine.scan("Users", null);
    defer {
        for (after_delete) |i| allocator.free(i);
        allocator.free(after_delete);
    }
    try std.testing.expectEqual(@as(usize, 2), after_delete.len);

    // Delete table
    try engine.deleteTable("Users");

    // Verify table deletion
    const tables = try engine.listTables();
    defer allocator.free(tables);
    try std.testing.expectEqual(@as(usize, 0), tables.len);
}

test "integration: multiple tables" {
    const allocator = std.testing.allocator;

    const path = "/tmp/test_integration_multi_table";
    defer std.fs.deleteTreeAbsolute(path) catch {};

    var engine = try storage.StorageEngine.init(allocator, path);
    defer engine.deinit();

    const key_schema = [_]types.KeySchemaElement{
        .{ .attribute_name = "pk", .key_type = .HASH },
    };
    const attr_defs = [_]types.AttributeDefinition{
        .{ .attribute_name = "pk", .attribute_type = .S },
    };

    // Create multiple tables
    _ = try engine.createTable("Table1", &key_schema, &attr_defs);
    _ = try engine.createTable("Table2", &key_schema, &attr_defs);
    _ = try engine.createTable("Table3", &key_schema, &attr_defs);

    // List tables
    const tables = try engine.listTables();
    defer {
        for (tables) |t| allocator.free(t);
        allocator.free(tables);
    }
    try std.testing.expectEqual(@as(usize, 3), tables.len);

    // Put items in different tables
    try engine.putItem("Table1", "{\"pk\":{\"S\":\"item1\"}}");
    try engine.putItem("Table2", "{\"pk\":{\"S\":\"item2\"}}");
    try engine.putItem("Table3", "{\"pk\":{\"S\":\"item3\"}}");

    // Verify isolation - scan should only return items from that table
    const table1_items = try engine.scan("Table1", null);
    defer {
        for (table1_items) |i| allocator.free(i);
        allocator.free(table1_items);
    }
    try std.testing.expectEqual(@as(usize, 1), table1_items.len);
}

test "integration: table already exists error" {
    const allocator = std.testing.allocator;

    const path = "/tmp/test_integration_exists";
    defer std.fs.deleteTreeAbsolute(path) catch {};

    var engine = try storage.StorageEngine.init(allocator, path);
    defer engine.deinit();

    const key_schema = [_]types.KeySchemaElement{
        .{ .attribute_name = "pk", .key_type = .HASH },
    };
    const attr_defs = [_]types.AttributeDefinition{
        .{ .attribute_name = "pk", .attribute_type = .S },
    };

    // Create table
    _ = try engine.createTable("DuplicateTest", &key_schema, &attr_defs);

    // Try to create again - should fail
    const result = engine.createTable("DuplicateTest", &key_schema, &attr_defs);
    try std.testing.expectError(storage.StorageError.TableAlreadyExists, result);
}

test "integration: table not found error" {
    const allocator = std.testing.allocator;

    const path = "/tmp/test_integration_notfound";
    defer std.fs.deleteTreeAbsolute(path) catch {};

    var engine = try storage.StorageEngine.init(allocator, path);
    defer engine.deinit();

    // Try to put item in non-existent table
    const result = engine.putItem("NonExistent", "{\"pk\":{\"S\":\"item1\"}}");
    try std.testing.expectError(storage.StorageError.TableNotFound, result);
}

test "integration: scan with limit" {
    const allocator = std.testing.allocator;

    const path = "/tmp/test_integration_scan_limit";
    defer std.fs.deleteTreeAbsolute(path) catch {};

    var engine = try storage.StorageEngine.init(allocator, path);
    defer engine.deinit();

    const key_schema = [_]types.KeySchemaElement{
        .{ .attribute_name = "pk", .key_type = .HASH },
    };
    const attr_defs = [_]types.AttributeDefinition{
        .{ .attribute_name = "pk", .attribute_type = .S },
    };

    _ = try engine.createTable("LimitTest", &key_schema, &attr_defs);

    // Add many items
    var i: usize = 0;
    while (i < 10) : (i += 1) {
        var buf: [128]u8 = undefined;
        const item = try std.fmt.bufPrint(&buf, "{{\"pk\":{{\"S\":\"item{d}\"}}}}", .{i});
        try engine.putItem("LimitTest", item);
    }

    // Scan with limit
    const limited = try engine.scan("LimitTest", 5);
    defer {
        for (limited) |item| allocator.free(item);
        allocator.free(limited);
    }
    try std.testing.expectEqual(@as(usize, 5), limited.len);
}