alef-e2e 0.2.0

//! PHP e2e test generator using PHPUnit.
//!
//! Generates `e2e/php/composer.json`, `e2e/php/phpunit.xml`, and
//! `tests/{Category}Test.php` files from JSON fixtures, driven entirely by
//! `E2eConfig` and `CallConfig`.

use crate::config::E2eConfig;
use crate::escape::{escape_php, sanitize_filename};
use crate::field_access::FieldResolver;
use crate::fixture::{Assertion, Fixture, FixtureGroup};
use alef_core::backend::GeneratedFile;
use alef_core::config::AlefConfig;
use anyhow::Result;
use heck::ToUpperCamelCase;
use std::fmt::Write as FmtWrite;
use std::path::PathBuf;

use super::E2eCodegen;

/// PHP e2e code generator.
pub struct PhpCodegen;

impl E2eCodegen for PhpCodegen {
    fn generate(
        &self,
        groups: &[FixtureGroup],
        e2e_config: &E2eConfig,
        alef_config: &AlefConfig,
    ) -> Result<Vec<GeneratedFile>> {
        let lang = self.language_name();
        let output_base = PathBuf::from(&e2e_config.output).join(lang);

        let mut files = Vec::new();

        // Resolve call config with overrides.
        let call = &e2e_config.call;
        let overrides = call.overrides.get(lang);
        let function_name = overrides
            .and_then(|o| o.function.as_ref())
            .cloned()
            .unwrap_or_else(|| call.function.clone());
        let class_name = overrides
            .and_then(|o| o.class.as_ref())
            .cloned()
            .unwrap_or_else(|| alef_config.crate_config.name.to_upper_camel_case());
        let namespace = overrides.and_then(|o| o.module.as_ref()).cloned().unwrap_or_else(|| {
            if call.module.is_empty() {
                "Kreuzberg".to_string()
            } else {
                call.module.to_upper_camel_case()
            }
        });
        let result_var = &call.result_var;

        // Resolve package config.
        let php_pkg = e2e_config.packages.get("php");
        let pkg_name = php_pkg
            .and_then(|p| p.name.as_ref())
            .cloned()
            .unwrap_or_else(|| format!("kreuzberg/{}", alef_config.crate_config.name));
        let pkg_path = php_pkg
            .and_then(|p| p.path.as_ref())
            .cloned()
            .unwrap_or_else(|| "../../packages/php".to_string());

        // Generate composer.json.
        files.push(GeneratedFile {
            path: output_base.join("composer.json"),
            content: render_composer_json(&pkg_name, &pkg_path),
            generated_header: false,
        });

        // Generate phpunit.xml.
        files.push(GeneratedFile {
            path: output_base.join("phpunit.xml"),
            content: render_phpunit_xml(),
            generated_header: false,
        });

        // Generate test files per category.
        let tests_base = output_base.join("tests");
        let field_resolver = FieldResolver::new(&e2e_config.fields, &e2e_config.fields_optional);

        for group in groups {
            let active: Vec<&Fixture> = group
                .fixtures
                .iter()
                .filter(|f| f.skip.as_ref().is_none_or(|s| !s.should_skip(lang)))
                .collect();

            if active.is_empty() {
                continue;
            }

            let test_class = format!("{}Test", sanitize_filename(&group.category).to_upper_camel_case());
            let filename = format!("{test_class}.php");
            let content = render_test_file(
                &group.category,
                &active,
                &namespace,
                &class_name,
                &function_name,
                result_var,
                &test_class,
                &e2e_config.call.args,
                &field_resolver,
            );
            files.push(GeneratedFile {
                path: tests_base.join(filename),
                content,
                generated_header: true,
            });
        }

        Ok(files)
    }

    fn language_name(&self) -> &'static str {
        "php"
    }
}

// ---------------------------------------------------------------------------
// Rendering
// ---------------------------------------------------------------------------

fn render_composer_json(pkg_name: &str, pkg_path: &str) -> String {
    format!(
        r#"{{
  "name": "kreuzberg/e2e-php",
  "description": "E2e tests for PHP bindings",
  "type": "project",
  "require-dev": {{
    "phpunit/phpunit": "^11.0",
    "{pkg_name}": "*"
  }},
  "repositories": [
    {{
      "type": "path",
      "url": "{pkg_path}"
    }}
  ],
  "autoload-dev": {{
    "psr-4": {{
      "Kreuzberg\\E2e\\": "tests/"
    }}
  }}
}}
"#
    )
}

fn render_phpunit_xml() -> String {
    r#"<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.0/phpunit.xsd"
         bootstrap="vendor/autoload.php"
         colors="true"
         failOnRisky="true"
         failOnWarning="true">
    <testsuites>
        <testsuite name="e2e">
            <directory>tests</directory>
        </testsuite>
    </testsuites>
</phpunit>
"#
    .to_string()
}

#[allow(clippy::too_many_arguments)]
fn render_test_file(
    category: &str,
    fixtures: &[&Fixture],
    namespace: &str,
    class_name: &str,
    function_name: &str,
    result_var: &str,
    test_class: &str,
    args: &[crate::config::ArgMapping],
    field_resolver: &FieldResolver,
) -> String {
    let mut out = String::new();
    let _ = writeln!(out, "<?php");
    let _ = writeln!(out);
    let _ = writeln!(out, "declare(strict_types=1);");
    let _ = writeln!(out);
    let _ = writeln!(out, "namespace Kreuzberg\\E2e;");
    let _ = writeln!(out);
    let _ = writeln!(out, "use PHPUnit\\Framework\\TestCase;");
    let _ = writeln!(out, "use {namespace}\\{class_name};");
    let _ = writeln!(out);
    let _ = writeln!(out, "/** E2e tests for category: {category}. */");
    let _ = writeln!(out, "final class {test_class} extends TestCase");
    let _ = writeln!(out, "{{");

    for (i, fixture) in fixtures.iter().enumerate() {
        render_test_method(
            &mut out,
            fixture,
            class_name,
            function_name,
            result_var,
            args,
            field_resolver,
        );
        if i + 1 < fixtures.len() {
            let _ = writeln!(out);
        }
    }

    let _ = writeln!(out, "}}");
    out
}

fn render_test_method(
    out: &mut String,
    fixture: &Fixture,
    class_name: &str,
    function_name: &str,
    result_var: &str,
    args: &[crate::config::ArgMapping],
    field_resolver: &FieldResolver,
) {
    let method_name = sanitize_filename(&fixture.id);
    let description = &fixture.description;
    let expects_error = fixture.assertions.iter().any(|a| a.assertion_type == "error");

    let args_str = build_args_string(&fixture.input, args);

    let _ = writeln!(out, "    /** {description} */");
    let _ = writeln!(out, "    public function test_{method_name}(): void");
    let _ = writeln!(out, "    {{");

    if expects_error {
        let _ = writeln!(out, "        $this->expectException(\\Exception::class);");
        let _ = writeln!(out, "        {class_name}::{function_name}({args_str});");
        let _ = writeln!(out, "    }}");
        return;
    }

    let _ = writeln!(
        out,
        "        ${result_var} = {class_name}::{function_name}({args_str});"
    );

    for assertion in &fixture.assertions {
        render_assertion(out, assertion, result_var, field_resolver);
    }

    let _ = writeln!(out, "    }}");
}

fn build_args_string(input: &serde_json::Value, args: &[crate::config::ArgMapping]) -> String {
    if args.is_empty() {
        return json_to_php(input);
    }

    let parts: Vec<String> = args
        .iter()
        .filter_map(|arg| {
            let val = input.get(&arg.field)?;
            if val.is_null() && arg.optional {
                return None;
            }
            Some(json_to_php(val))
        })
        .collect();

    parts.join(", ")
}

fn render_assertion(out: &mut String, assertion: &Assertion, result_var: &str, field_resolver: &FieldResolver) {
    let field_expr = match &assertion.field {
        Some(f) if !f.is_empty() => field_resolver.accessor(f, "php", &format!("${result_var}")),
        _ => format!("${result_var}"),
    };

    match assertion.assertion_type.as_str() {
        "equals" => {
            if let Some(expected) = &assertion.value {
                let php_val = json_to_php(expected);
                let _ = writeln!(out, "        $this->assertEquals({php_val}, trim({field_expr}));");
            }
        }
        "contains" => {
            if let Some(expected) = &assertion.value {
                let php_val = json_to_php(expected);
                let _ = writeln!(
                    out,
                    "        $this->assertStringContainsString({php_val}, {field_expr});"
                );
            }
        }
        "contains_all" => {
            if let Some(values) = &assertion.values {
                for val in values {
                    let php_val = json_to_php(val);
                    let _ = writeln!(
                        out,
                        "        $this->assertStringContainsString({php_val}, {field_expr});"
                    );
                }
            }
        }
        "not_contains" => {
            if let Some(expected) = &assertion.value {
                let php_val = json_to_php(expected);
                let _ = writeln!(
                    out,
                    "        $this->assertStringNotContainsString({php_val}, {field_expr});"
                );
            }
        }
        "not_empty" => {
            let _ = writeln!(out, "        $this->assertNotEmpty({field_expr});");
        }
        "is_empty" => {
            let _ = writeln!(out, "        $this->assertEmpty({field_expr});");
        }
        "starts_with" => {
            if let Some(expected) = &assertion.value {
                let php_val = json_to_php(expected);
                let _ = writeln!(out, "        $this->assertStringStartsWith({php_val}, {field_expr});");
            }
        }
        "ends_with" => {
            if let Some(expected) = &assertion.value {
                let php_val = json_to_php(expected);
                let _ = writeln!(out, "        $this->assertStringEndsWith({php_val}, {field_expr});");
            }
        }
        "min_length" => {
            if let Some(val) = &assertion.value {
                if let Some(n) = val.as_u64() {
                    let _ = writeln!(
                        out,
                        "        $this->assertGreaterThanOrEqual({n}, strlen({field_expr}));"
                    );
                }
            }
        }
        "max_length" => {
            if let Some(val) = &assertion.value {
                if let Some(n) = val.as_u64() {
                    let _ = writeln!(out, "        $this->assertLessThanOrEqual({n}, strlen({field_expr}));");
                }
            }
        }
        "not_error" => {
            // Already handled by the call succeeding without exception.
        }
        "error" => {
            // Handled at the test method level.
        }
        other => {
            let _ = writeln!(out, "        // TODO: unsupported assertion type: {other}");
        }
    }
}

/// Convert a `serde_json::Value` to a PHP literal string.
fn json_to_php(value: &serde_json::Value) -> String {
    match value {
        serde_json::Value::String(s) => format!("\"{}\"", escape_php(s)),
        serde_json::Value::Bool(true) => "true".to_string(),
        serde_json::Value::Bool(false) => "false".to_string(),
        serde_json::Value::Number(n) => n.to_string(),
        serde_json::Value::Null => "null".to_string(),
        serde_json::Value::Array(arr) => {
            let items: Vec<String> = arr.iter().map(json_to_php).collect();
            format!("[{}]", items.join(", "))
        }
        serde_json::Value::Object(map) => {
            let items: Vec<String> = map
                .iter()
                .map(|(k, v)| format!("\"{}\" => {}", escape_php(k), json_to_php(v)))
                .collect();
            format!("[{}]", items.join(", "))
        }
    }
}