#!/bin/bash
# build-config.sh - Essential build configuration extracted from 4ed_build.cpp
# This file contains all the platform-specific compiler flags, linker flags, and build settings

# =============================================================================
# Directory Configuration
# =============================================================================

# Get the directory containing this script
CONFIG_SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$CONFIG_SCRIPT_DIR/../.." && pwd)"

# Build directories (absolute paths)
BUILD_DIR="$PROJECT_ROOT/build"
BUILD_TEMP_DIR="$PROJECT_ROOT/build_new/temp"
PACK_DIR="$PROJECT_ROOT/distributions"
SITE_DIR="$PROJECT_ROOT/site"

# Source directories (absolute paths)
CODE_DIR="$PROJECT_ROOT/code"
GENERATED_DIR="$PROJECT_ROOT/code/generated"
CUSTOM_DIR="$PROJECT_ROOT/code/custom"
CUSTOM_GENERATED_DIR="$PROJECT_ROOT/code/custom/generated"
FOREIGN_DIR="$PROJECT_ROOT/non-source/foreign"
SCRIPTS_DIR="$PROJECT_ROOT/build_new/scripts"
HELPERS_DIR="$PROJECT_ROOT/build_new/helpers"

# Include directories
INCLUDES=(
    "$CUSTOM_DIR"
    "$FOREIGN_DIR/freetype2"
)

# =============================================================================
# Platform Detection
# =============================================================================

# Platform codes
PLATFORM_WINDOWS=0
PLATFORM_LINUX=1
PLATFORM_MAC=2

# Architecture codes
ARCH_X64=0
ARCH_X86=1

# =============================================================================
# Build Flags
# =============================================================================

# Build flag bits (matching 4ed_build.cpp)
FLAG_OPTS=$((0x1))           # Compiler warnings/options
FLAG_LIBS=$((0x2))           # Link libraries
FLAG_ICON=$((0x4))           # Windows icon resource
FLAG_SHARED_CODE=$((0x8))    # Build as shared library
FLAG_DEBUG_INFO=$((0x10))    # Debug symbols
FLAG_OPTIMIZATION=$((0x20))  # Optimization level
FLAG_SUPER=$((0x40))         # Super tier features
FLAG_INTERNAL=$((0x80))      # Internal build flags
FLAG_SHIP=$((0x100))         # Shipping build

# =============================================================================
# Compiler Options - Windows (CL equivalent using clang)
# =============================================================================

# Windows compiler options (translated from CL to clang)
CLANG_OPTS_WINDOWS=(
    "-Wall"                           # Enable most warnings
    "-Wno-unused-parameter"           # Disable unused parameter warnings
    "-Wno-unused-variable"            # Disable unused variable warnings
    "-Wno-missing-field-initializers" # Disable missing field initializer warnings
    "-Wno-deprecated-declarations"    # Disable deprecated declarations warnings
    "-Wno-missing-braces"            # Disable missing braces warnings
    "-Wno-tautological-compare"      # Disable tautological compare warnings
    "-Wno-write-strings"             # Disable write strings warnings
    "-Werror"                        # Treat warnings as errors
    "-fno-rtti"                      # Disable RTTI (equivalent to /GR-)
    "-fno-exceptions"                # Disable exceptions (equivalent to /EHa-)
    "-std=c++11"                     # C++11 standard
    "-target x86_64-pc-windows-msvc" # Target Windows with MSVC ABI
)

# Windows libraries
LIBS_WINDOWS=(
    "-luser32"
    "-lwinmm"
    "-lgdi32"
    "-lopengl32"
    "-lcomdlg32"
    "-luserenv"
)

# Windows FreeType libraries
FREETYPE_LIB_WINDOWS_X64="$FOREIGN_DIR/x64/freetype.lib"
FREETYPE_LIB_WINDOWS_X86="$FOREIGN_DIR/x86/freetype.lib"

# Windows icon resource
WINDOWS_ICON="$PROJECT_ROOT/non-source/res/icon.res"

# =============================================================================
# Compiler Options - Linux (GCC equivalent using clang)
# =============================================================================

CLANG_OPTS_LINUX=(
    "-Wno-write-strings"
    "-D_GNU_SOURCE"
    "-fPIC"
    "-fno-threadsafe-statics"
    "-pthread"
    "-Wno-unused-result"
    "-std=c++11"
    "-target x86_64-linux-gnu"    # Target Linux
)

# Linux libraries
LIBS_LINUX=(
    "-lX11"
    "-lpthread"
    "-lm"
    "-lrt"
    "-lGL"
    "-ldl"
    "-lXfixes"
    "-lfreetype"
    "-lfontconfig"
)

# Linux platform includes
PLATFORM_INCLUDES_LINUX=(
    "platform_all"
    "platform_unix"
)

# =============================================================================
# Compiler Options - macOS (Clang native)
# =============================================================================

CLANG_OPTS_MACOS=(
    "-Wno-write-strings"
    "-Wno-deprecated-declarations"
    "-Wno-comment"
    "-Wno-switch"
    "-Wno-null-dereference"
    "-Wno-tautological-compare"
    "-Wno-unused-result"
    "-Wno-missing-declarations"
    "-Wno-nullability-completeness"
    "-std=c++11"
    # Target will be set based on architecture
)

# macOS frameworks (equivalent to libraries)
FRAMEWORKS_MACOS=(
    "-lc++"
    "-lobjc"
    -framework Cocoa
    -framework QuartzCore
    -framework CoreServices
    -framework OpenGL
    -framework IOKit
    -framework Metal
    -framework MetalKit
)

# macOS FreeType libraries
FREETYPE_LIB_MACOS_X64="$FOREIGN_DIR/x64/libfreetype-mac.a"
FREETYPE_LIB_MACOS_X86="$FOREIGN_DIR/x86/libfreetype-mac.a"

# macOS platform includes
PLATFORM_INCLUDES_MACOS=(
    "platform_all"
    "platform_unix"
)

# =============================================================================
# Architecture-specific flags
# =============================================================================

# 64-bit architecture
ARCH_FLAGS_X64=(
    "-m64"
    "-DFTECH_64_BIT"
)

# 32-bit architecture
ARCH_FLAGS_X86=(
    "-m32"
    "-DFTECH_32_BIT"
)

# =============================================================================
# Build Mode Flags
# =============================================================================

# Debug flags
DEBUG_FLAGS=(
    "-g"                          # Debug symbols
    "-O0"                         # No optimization
    "-DDO_CRAZY_EXPENSIVE_ASSERTS" # Enable expensive assertions
)

# Release flags
RELEASE_FLAGS=(
    "-O2"    # Optimization level 2 (clang equivalent to -O3 for performance)
)

# =============================================================================
# File Lists (from 4ed_build.cpp)
# =============================================================================

# Platform layer files
PLATFORM_FILES_WINDOWS=("platform_win32/win32_4ed.cpp")
PLATFORM_FILES_LINUX=("platform_linux/linux_4ed.cpp")
PLATFORM_FILES_MACOS=("platform_mac/mac_4ed.mm")

# Custom layer default target
DEFAULT_CUSTOM_TARGET="$CUSTOM_DIR/4coder_default_bindings.cpp"

# =============================================================================
# Build Defines
# =============================================================================

# Function to get defines from flags (equivalent to get_defines_from_flags in 4ed_build.cpp)
get_defines_from_flags() {
    local flags=$1
    local defines=()

    if (( flags & FLAG_SHIP )); then
        defines+=("-DSHIP_MODE")
    fi

    if (( flags & FLAG_INTERNAL )); then
        defines+=("-DFRED_INTERNAL")
    fi

    if (( flags & FLAG_SUPER )); then
        defines+=("-DFRED_SUPER")
    fi

    echo "${defines[@]}"
}

# =============================================================================
# Build Outputs
# =============================================================================

# Main executable names
EXECUTABLE_WINDOWS="4ed.exe"
EXECUTABLE_LINUX="4ed"
EXECUTABLE_MACOS="4ed"

# Shared library names
SHARED_LIB_WINDOWS="4ed_app.dll"
SHARED_LIB_LINUX="4ed_app.so"
SHARED_LIB_MACOS="4ed_app.so"

# Custom layer library names
CUSTOM_LIB_WINDOWS="custom_4coder.dll"
CUSTOM_LIB_LINUX="custom_4coder.so"
CUSTOM_LIB_MACOS="custom_4coder.so"

# =============================================================================
# Utility Functions
# =============================================================================

# Get platform-specific settings
get_platform_settings() {
    local platform=$1
    case $platform in
        "windows"|"win32")
            echo "PLATFORM_WINDOWS"
            ;;
        "linux")
            echo "PLATFORM_LINUX"
            ;;
        "macos"|"mac")
            echo "PLATFORM_MAC"
            ;;
        *)
            echo "UNKNOWN_PLATFORM"
            return 1
            ;;
    esac
}

# Get architecture-specific settings
get_arch_settings() {
    local arch=$1
    case $arch in
        "x64"|"x86_64")
            echo "ARCH_X64"
            ;;
        "x86"|"i386")
            echo "ARCH_X86"
            ;;
        *)
            echo "UNKNOWN_ARCH"
            return 1
            ;;
    esac
}

# Check if flag is set
has_flag() {
    local flags=$1
    local flag=$2
    (( flags & flag ))
}