use alef_backend_kotlin::KotlinBackend;
use alef_core::backend::Backend;
use alef_core::config::{AlefConfig, CrateConfig};
use alef_core::ir::{
    ApiSurface, CoreWrapper, EnumDef, EnumVariant, ErrorDef, ErrorVariant, FieldDef, FunctionDef, ParamDef,
    PrimitiveType, TypeDef, TypeRef,
};

fn make_field(name: &str, ty: TypeRef, optional: bool) -> FieldDef {
    FieldDef {
        name: name.to_string(),
        ty,
        optional,
        default: None,
        doc: String::new(),
        sanitized: false,
        is_boxed: false,
        type_rust_path: None,
        cfg: None,
        typed_default: None,
        core_wrapper: CoreWrapper::None,
        vec_inner_core_wrapper: CoreWrapper::None,
        newtype_wrapper: None,
    }
}

fn make_param(name: &str, ty: TypeRef) -> ParamDef {
    ParamDef {
        name: name.to_string(),
        ty,
        optional: false,
        default: None,
        sanitized: false,
        typed_default: None,
        is_ref: false,
        is_mut: false,
        newtype_wrapper: None,
        original_type: None,
    }
}

fn make_basic_api() -> ApiSurface {
    ApiSurface {
        crate_name: "demo".into(),
        version: "0.1.0".into(),
        types: vec![TypeDef {
            name: "Config".to_string(),
            rust_path: "demo::Config".to_string(),
            original_rust_path: String::new(),
            fields: vec![
                make_field("value", TypeRef::Primitive(PrimitiveType::I32), false),
                make_field("label", TypeRef::String, false),
                make_field("tag", TypeRef::Optional(Box::new(TypeRef::String)), true),
            ],
            methods: vec![],
            is_opaque: false,
            is_clone: true,
            is_copy: false,
            doc: "A demo configuration struct.".to_string(),
            cfg: None,
            is_trait: false,
            has_default: false,
            has_stripped_cfg_fields: false,
            is_return_type: false,
            serde_rename_all: None,
            has_serde: false,
            super_traits: vec![],
        }],
        functions: vec![FunctionDef {
            name: "process".into(),
            rust_path: "demo::process".into(),
            original_rust_path: String::new(),
            params: vec![
                make_param("input", TypeRef::String),
                make_param("count", TypeRef::Primitive(PrimitiveType::U32)),
            ],
            return_type: TypeRef::String,
            is_async: false,
            error_type: Some("DemoError".to_string()),
            doc: "Process input and return a result.".to_string(),
            cfg: None,
            sanitized: false,
            return_sanitized: false,
            returns_ref: false,
            returns_cow: false,
            return_newtype_wrapper: None,
        }],
        enums: vec![EnumDef {
            name: "Status".to_string(),
            rust_path: "demo::Status".to_string(),
            original_rust_path: String::new(),
            variants: vec![
                EnumVariant {
                    name: "Active".to_string(),
                    fields: vec![],
                    is_tuple: false,
                    doc: "Active state.".to_string(),
                    is_default: false,
                    serde_rename: None,
                },
                EnumVariant {
                    name: "Inactive".to_string(),
                    fields: vec![],
                    is_tuple: false,
                    doc: "Inactive state.".to_string(),
                    is_default: false,
                    serde_rename: None,
                },
            ],
            doc: "Processing status.".to_string(),
            cfg: None,
            is_copy: false,
            has_serde: false,
            serde_tag: None,
            serde_rename_all: None,
        }],
        errors: vec![ErrorDef {
            name: "DemoError".to_string(),
            rust_path: "demo::DemoError".to_string(),
            original_rust_path: String::new(),
            variants: vec![
                ErrorVariant {
                    name: "InvalidInput".to_string(),
                    message_template: Some("invalid input provided".to_string()),
                    fields: vec![],
                    has_source: false,
                    has_from: false,
                    is_unit: true,
                    doc: "Input validation failed.".to_string(),
                },
                ErrorVariant {
                    name: "ProcessingFailed".to_string(),
                    message_template: Some("processing failed".to_string()),
                    fields: vec![],
                    has_source: false,
                    has_from: false,
                    is_unit: true,
                    doc: "Processing encountered an error.".to_string(),
                },
            ],
            doc: "Errors emitted by demo operations.".to_string(),
        }],
    }
}

fn make_basic_config() -> AlefConfig {
    AlefConfig {
        version: None,
        crate_config: CrateConfig {
            name: "demo".to_string(),
            sources: vec![],
            version_from: "Cargo.toml".to_string(),
            core_import: None,
            workspace_root: None,
            skip_core_import: false,
            features: vec![],
            path_mappings: std::collections::HashMap::new(),
            auto_path_mappings: Default::default(),
            extra_dependencies: Default::default(),
            source_crates: vec![],
            error_type: None,
            error_constructor: None,
        },
        languages: vec![],
        exclude: Default::default(),
        include: Default::default(),
        output: Default::default(),
        python: None,
        node: None,
        ruby: None,
        php: None,
        elixir: None,
        wasm: None,
        ffi: None,
        gleam: None,
        go: None,
        java: Some(alef_core::config::JavaConfig {
            package: Some("dev.kreuzberg".to_string()),
            ffi_style: "panama".to_string(),
            features: None,
            serde_rename_all: None,
            rename_fields: Default::default(),
            run_wrapper: None,
            extra_lint_paths: Vec::new(),
            project_file: None,
        }),
        kotlin: Some(alef_core::config::KotlinConfig {
            package: Some("dev.kreuzberg".to_string()),
            features: None,
            serde_rename_all: None,
            rename_fields: Default::default(),
            exclude_functions: Vec::new(),
            exclude_types: Vec::new(),
            run_wrapper: None,
            extra_lint_paths: Vec::new(),
            target: alef_core::config::KotlinTarget::Jvm,
        }),
        dart: None,
        swift: None,
        csharp: None,
        r: None,
        zig: None,
        scaffold: None,
        readme: None,
        lint: None,
        update: None,
        test: None,
        setup: None,
        clean: None,
        build_commands: None,
        publish: None,
        custom_files: None,
        adapters: vec![],
        custom_modules: alef_core::config::CustomModulesConfig::default(),
        custom_registrations: alef_core::config::CustomRegistrationsConfig::default(),
        opaque_types: std::collections::HashMap::new(),
        generate: alef_core::config::GenerateConfig::default(),
        generate_overrides: std::collections::HashMap::new(),
        dto: Default::default(),
        sync: None,
        e2e: None,
        trait_bridges: vec![],
        tools: alef_core::config::ToolsConfig::default(),
        format: alef_core::config::FormatConfig::default(),
        format_overrides: std::collections::HashMap::new(),
    }
}

#[test]
fn snapshot_basic_struct_function_enum_error() {
    let api = make_basic_api();
    let config = make_basic_config();
    let files = KotlinBackend.generate_bindings(&api, &config).unwrap();
    for file in &files {
        insta::assert_snapshot!(
            format!("snapshot_basic__{}", file.path.display().to_string().replace('/', "__")),
            &file.content
        );
    }
}
