spikard-cli 0.16.0

//! PHP Protobuf code generator.
//!
//! This generator produces type-safe PHP code for Protobuf message and service definitions.
//! Generated code uses PHP 8.1+ typed properties and PHPStan-compatible type annotations
//! with the google/protobuf library.

use super::ProtobufGenerator;
use super::base::{escape_string, map_proto_type_to_language, sanitize_identifier, to_camel_case};
use crate::codegen::protobuf::spec_parser::{FieldLabel, MessageDef, ProtobufSchema, ServiceDef};
use anyhow::Result;

/// PHP Protobuf code generator
#[derive(Default, Debug, Clone, Copy)]
#[allow(dead_code)]
pub struct PhpProtobufGenerator;

impl ProtobufGenerator for PhpProtobufGenerator {
    fn generate_complete(&self, schema: &ProtobufSchema) -> Result<String> {
        let mut code = String::new();
        let namespace = php_namespace(schema.package.as_deref());
        let has_messages = !schema.messages.is_empty() || !schema.enums.is_empty();
        let has_services = !schema.services.is_empty();

        code.push_str("<?php\n");
        code.push_str("// DO NOT EDIT - Auto-generated by Spikard CLI\n");
        code.push_str("//\n");
        code.push_str("// This file was automatically generated from your Protobuf schema.\n");
        code.push_str("// Any manual changes will be overwritten on the next generation.\n\n");
        code.push_str("declare(strict_types=1);\n\n");
        code.push_str(&format!("namespace {namespace};\n\n"));

        if has_messages {
            code.push_str("use Google\\Protobuf\\Internal\\Message;\n");
        }
        if has_services {
            code.push_str("use RuntimeException;\n");
        }
        if has_messages || has_services {
            code.push('\n');
        }

        for message in schema.messages.values() {
            code.push_str(&self.generate_message_class(message));
            code.push_str("\n\n");
        }

        for enum_def in schema.enums.values() {
            code.push_str(&self.generate_enum_class(enum_def));
            code.push_str("\n\n");
        }

        if schema.services.is_empty() {
            code.push_str("// No services defined in this schema.\n");
        } else {
            for service in schema.services.values() {
                code.push_str(&self.generate_service_class(service));
                code.push_str("\n\n");
            }
        }

        Ok(code.trim_end().to_string() + "\n")
    }

    fn generate_messages(&self, schema: &ProtobufSchema) -> Result<String> {
        let mut code = String::new();
        let namespace = php_namespace(schema.package.as_deref());

        // File header
        code.push_str("<?php\n");
        code.push_str("// DO NOT EDIT - Auto-generated by Spikard CLI\n");
        code.push_str("//\n");
        code.push_str("// This file was automatically generated from your Protobuf schema.\n");
        code.push_str("// Any manual changes will be overwritten on the next generation.\n\n");

        code.push_str("declare(strict_types=1);\n\n");

        // Namespace
        code.push_str(&format!("namespace {namespace};\n\n"));

        // Imports
        code.push_str("use Google\\Protobuf\\Internal\\Message;\n\n");

        // Generate message definitions
        for message in schema.messages.values() {
            code.push_str(&self.generate_message_class(message));
            code.push_str("\n\n");
        }

        // Generate enum definitions
        for enum_def in schema.enums.values() {
            code.push_str(&self.generate_enum_class(enum_def));
            code.push_str("\n\n");
        }

        Ok(code.trim_end().to_string() + "\n")
    }

    fn generate_services(&self, schema: &ProtobufSchema) -> Result<String> {
        let mut code = String::new();
        let namespace = php_namespace(schema.package.as_deref());

        // File header
        code.push_str("<?php\n");
        code.push_str("// DO NOT EDIT - Auto-generated by Spikard CLI\n");
        code.push_str("//\n");
        code.push_str("// This file was automatically generated from your Protobuf schema.\n");
        code.push_str("// Any manual changes will be overwritten on the next generation.\n\n");

        code.push_str("declare(strict_types=1);\n\n");

        // Namespace
        code.push_str(&format!("namespace {namespace};\n\n"));

        // Imports
        code.push_str("use RuntimeException;\n\n");

        // Generate service definitions
        if schema.services.is_empty() {
            code.push_str("// No services defined in this schema.\n");
        } else {
            for service in schema.services.values() {
                code.push_str(&self.generate_service_class(service));
                code.push_str("\n\n");
            }
        }

        Ok(code.trim_end().to_string() + "\n")
    }
}

fn php_namespace(package: Option<&str>) -> String {
    package.unwrap_or("Protobuf").replace('.', "\\")
}

impl PhpProtobufGenerator {
    fn phpdoc_field_type(&self, field: &crate::codegen::protobuf::spec_parser::FieldDef) -> String {
        let base_type = map_proto_type_to_language(&field.field_type, "php", false, false);

        match field.label {
            FieldLabel::Repeated => format!("list<{base_type}>"),
            FieldLabel::Optional => format!("{base_type}|null"),
            _ => base_type,
        }
    }

    /// Generate a message class definition
    #[allow(dead_code)]
    fn generate_message_class(&self, message: &MessageDef) -> String {
        let mut code = String::new();

        // Class definition
        code.push_str(&format!("class {} extends Message\n", message.name));
        code.push_str("{\n");

        // Docstring
        if let Some(desc) = &message.description {
            code.push_str(&format!("    /**\n     * {}\n     */\n", escape_string(desc, "php")));
        } else {
            code.push_str("    /**\n     * Generated protocol buffer message.\n     */\n");
        }

        if message.fields.is_empty() {
            code.push_str("}\n");
        } else {
            // Add typed properties
            for field in &message.fields {
                // Field comment if available
                if let Some(desc) = &field.description {
                    code.push_str(&format!("    /**\n     * {}\n     */\n", escape_string(desc, "php")));
                }

                let field_name = sanitize_identifier(&field.name, "php");
                let is_optional = field.label == FieldLabel::Optional;
                let is_repeated = field.label == FieldLabel::Repeated;

                let field_type = map_proto_type_to_language(&field.field_type, "php", is_optional, is_repeated);
                let phpdoc_type = self.phpdoc_field_type(field);

                // Default value based on type
                let default_val = if is_repeated {
                    "[]".to_string()
                } else if is_optional {
                    "null".to_string()
                } else if matches!(
                    field.field_type,
                    crate::codegen::protobuf::spec_parser::ProtoType::String
                        | crate::codegen::protobuf::spec_parser::ProtoType::Bytes
                ) {
                    "''".to_string()
                } else if matches!(field.field_type, crate::codegen::protobuf::spec_parser::ProtoType::Bool) {
                    "false".to_string()
                } else {
                    "0".to_string()
                };

                code.push_str(&format!("    /** @var {phpdoc_type} */\n"));
                code.push_str(&format!("    protected {field_type} ${field_name} = {default_val};\n"));
            }

            code.push_str("}\n");
        }

        code
    }

    /// Generate an enum class definition
    #[allow(dead_code)]
    fn generate_enum_class(&self, enum_def: &crate::codegen::protobuf::spec_parser::EnumDef) -> String {
        let mut code = String::new();

        code.push_str(&format!("class {} extends Message\n", enum_def.name));
        code.push_str("{\n");

        // Docstring
        if let Some(desc) = &enum_def.description {
            code.push_str(&format!("    /**\n     * {}\n     */\n", escape_string(desc, "php")));
        } else {
            code.push_str("    /**\n     * Protobuf enum type.\n     */\n");
        }

        if enum_def.values.is_empty() {
            code.push_str("}\n");
        } else {
            for value in &enum_def.values {
                if let Some(desc) = &value.description {
                    code.push_str(&format!("    /** {} */\n", escape_string(desc, "php")));
                }
                code.push_str(&format!(
                    "    const {} = {};\n",
                    value.name.to_uppercase(),
                    value.number
                ));
            }
            code.push_str("}\n");
        }

        code
    }

    /// Generate a service class definition (server interface)
    #[allow(dead_code)]
    fn generate_service_class(&self, service: &ServiceDef) -> String {
        let mut code = String::new();

        // Service class
        code.push_str(&format!("class {}\n", service.name));
        code.push_str("{\n");

        // Docstring
        if let Some(desc) = &service.description {
            code.push_str(&format!(
                "    /**\n     * Server handler interface for {}.\n     * {}\n     */\n",
                service.name,
                escape_string(desc, "php")
            ));
        } else {
            code.push_str(&format!(
                "    /**\n     * Server handler interface for {}.\n     */\n",
                service.name
            ));
        }

        if service.methods.is_empty() {
            code.push_str("}\n");
        } else {
            for method in &service.methods {
                code.push('\n');

                // Method docstring
                if let Some(desc) = &method.description {
                    code.push_str(&format!("    /**\n     * {}\n", escape_string(desc, "php")));
                } else {
                    code.push_str("    /**\n");
                }

                // Build method signature
                let sanitized_name = sanitize_identifier(&method.name, "php");
                let method_name = to_camel_case(&sanitized_name);
                let request_type = &method.input_type;
                let response_type = &method.output_type;

                code.push_str(&format!("     * @param {request_type} $request\n"));
                code.push_str(&format!("     * @return {response_type}\n"));
                code.push_str("     */\n");

                // Use fixed parameter name $request to avoid indexing issues
                code.push_str(&format!(
                    "    public function {method_name}({request_type} $request): {response_type}\n"
                ));

                code.push_str("    {\n");
                code.push_str("        throw new RuntimeException('Not implemented');\n");
                code.push_str("    }\n");
            }

            code.push_str("}\n");
        }

        code
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::codegen::protobuf::spec_parser::{FieldDef, FieldLabel, MessageDef, ProtoType};

    #[test]
    fn test_generate_simple_message() {
        let message = MessageDef {
            name: "User".to_string(),
            fields: vec![
                FieldDef {
                    name: "id".to_string(),
                    number: 1,
                    field_type: ProtoType::String,
                    label: FieldLabel::None,
                    default_value: None,
                    description: None,
                },
                FieldDef {
                    name: "name".to_string(),
                    number: 2,
                    field_type: ProtoType::String,
                    label: FieldLabel::None,
                    default_value: None,
                    description: Some("User's full name".to_string()),
                },
            ],
            nested_messages: std::collections::HashMap::new(),
            nested_enums: std::collections::HashMap::new(),
            description: Some("Represents a user".to_string()),
        };

        let generator = PhpProtobufGenerator;
        let code = generator.generate_message_class(&message);

        assert!(code.contains("class User extends Message"));
        assert!(code.contains("Represents a user"));
        assert!(code.contains("protected string $id = ''"));
        assert!(code.contains("protected string $name = ''"));
    }

    #[test]
    fn test_generate_message_with_optional_field() {
        let message = MessageDef {
            name: "User".to_string(),
            fields: vec![FieldDef {
                name: "email".to_string(),
                number: 3,
                field_type: ProtoType::String,
                label: FieldLabel::Optional,
                default_value: None,
                description: None,
            }],
            nested_messages: std::collections::HashMap::new(),
            nested_enums: std::collections::HashMap::new(),
            description: None,
        };

        let generator = PhpProtobufGenerator;
        let code = generator.generate_message_class(&message);

        assert!(code.contains("protected ?string $email = null"));
    }

    #[test]
    fn test_generate_message_with_repeated_field() {
        let message = MessageDef {
            name: "User".to_string(),
            fields: vec![FieldDef {
                name: "tags".to_string(),
                number: 4,
                field_type: ProtoType::String,
                label: FieldLabel::Repeated,
                default_value: None,
                description: None,
            }],
            nested_messages: std::collections::HashMap::new(),
            nested_enums: std::collections::HashMap::new(),
            description: None,
        };

        let generator = PhpProtobufGenerator;
        let code = generator.generate_message_class(&message);

        assert!(code.contains("protected array $tags = []"));
    }

    #[test]
    fn test_generate_typed_properties() {
        let message = MessageDef {
            name: "TestMessage".to_string(),
            fields: vec![
                FieldDef {
                    name: "count".to_string(),
                    number: 1,
                    field_type: ProtoType::Int32,
                    label: FieldLabel::None,
                    default_value: None,
                    description: None,
                },
                FieldDef {
                    name: "enabled".to_string(),
                    number: 2,
                    field_type: ProtoType::Bool,
                    label: FieldLabel::None,
                    default_value: None,
                    description: None,
                },
                FieldDef {
                    name: "value".to_string(),
                    number: 3,
                    field_type: ProtoType::Float,
                    label: FieldLabel::None,
                    default_value: None,
                    description: None,
                },
            ],
            nested_messages: std::collections::HashMap::new(),
            nested_enums: std::collections::HashMap::new(),
            description: None,
        };

        let generator = PhpProtobufGenerator;
        let code = generator.generate_message_class(&message);

        assert!(code.contains("protected int $count = 0"));
        assert!(code.contains("protected bool $enabled = false"));
        assert!(code.contains("protected float $value = 0"));
    }

    #[test]
    fn test_generate_service_class() {
        let service = ServiceDef {
            name: "UserService".to_string(),
            methods: vec![crate::codegen::protobuf::spec_parser::MethodDef {
                name: "get_user".to_string(),
                input_type: "GetUserRequest".to_string(),
                output_type: "User".to_string(),
                input_streaming: false,
                output_streaming: false,
                description: None,
            }],
            description: Some("User service".to_string()),
        };

        let generator = PhpProtobufGenerator;
        let code = generator.generate_service_class(&service);

        assert!(code.contains("class UserService"));
        assert!(code.contains("public function getUser"));
        assert!(code.contains("GetUserRequest"));
        assert!(code.contains("User"));
        assert!(code.contains("RuntimeException"));
    }

    #[test]
    fn test_generate_messages_with_namespace() {
        let schema = ProtobufSchema {
            package: Some("Example\\Api".to_string()),
            messages: vec![(
                "User".to_string(),
                MessageDef {
                    name: "User".to_string(),
                    fields: vec![FieldDef {
                        name: "id".to_string(),
                        number: 1,
                        field_type: ProtoType::String,
                        label: FieldLabel::None,
                        default_value: None,
                        description: None,
                    }],
                    nested_messages: std::collections::HashMap::new(),
                    nested_enums: std::collections::HashMap::new(),
                    description: None,
                },
            )]
            .into_iter()
            .collect(),
            services: std::collections::HashMap::new(),
            enums: std::collections::HashMap::new(),
            imports: vec![],
            syntax: "proto3".to_string(),
            description: None,
        };

        let generator = PhpProtobufGenerator;
        let code = generator
            .generate_messages(&schema)
            .expect("Failed to generate messages");

        assert!(code.contains("<?php"));
        assert!(code.contains("namespace Example\\Api"));
        assert!(code.contains("use Google\\Protobuf\\Internal\\Message"));
        assert!(code.contains("class User extends Message"));
    }

    #[test]
    fn test_generate_services_with_namespace() {
        let schema = ProtobufSchema {
            package: Some("Example\\Service".to_string()),
            messages: std::collections::HashMap::new(),
            services: vec![(
                "UserService".to_string(),
                ServiceDef {
                    name: "UserService".to_string(),
                    methods: vec![],
                    description: None,
                },
            )]
            .into_iter()
            .collect(),
            enums: std::collections::HashMap::new(),
            imports: vec![],
            syntax: "proto3".to_string(),
            description: None,
        };

        let generator = PhpProtobufGenerator;
        let code = generator
            .generate_services(&schema)
            .expect("Failed to generate services");

        assert!(code.contains("<?php"));
        assert!(code.contains("namespace Example\\Service"));
        assert!(code.contains("use RuntimeException"));
    }

    #[test]
    fn test_enum_class_generation() {
        let enum_def = crate::codegen::protobuf::spec_parser::EnumDef {
            name: "Status".to_string(),
            values: vec![
                crate::codegen::protobuf::spec_parser::EnumValue {
                    name: "UNKNOWN".to_string(),
                    number: 0,
                    description: None,
                },
                crate::codegen::protobuf::spec_parser::EnumValue {
                    name: "ACTIVE".to_string(),
                    number: 1,
                    description: Some("Active status".to_string()),
                },
            ],
            description: Some("Status enumeration".to_string()),
        };

        let generator = PhpProtobufGenerator;
        let code = generator.generate_enum_class(&enum_def);

        assert!(code.contains("class Status extends Message"));
        assert!(code.contains("const UNKNOWN = 0"));
        assert!(code.contains("const ACTIVE = 1"));
        assert!(code.contains("Status enumeration"));
    }
}