# Velox Download Manager — top-level build. Owned by lane PKG/QA.
#
# Lanes land in parallel and merge to main independently, so every add_subdirectory()
# here is guarded by EXISTS on the lane's own CMakeLists.txt: main always configures,
# and a lane's targets light up the moment that lane merges — no coordinated edit here.
#
#   cmake --preset dev && cmake --build --preset dev
#   ctest --preset dev

cmake_minimum_required(VERSION 3.28)

project(velox
    VERSION 0.1.0
    DESCRIPTION "IDM-class download manager for Linux"
    LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

if(NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
endif()

option(VELOX_BUILD_GUI    "Build the Qt 6 GUI client"              ON)
option(VELOX_BUILD_TESTS  "Build unit and integration tests"      ON)
option(VELOX_BUILD_FUZZ   "Build libFuzzer targets (clang only)"  OFF)
option(VELOX_ENABLE_MEDIA "Build the HLS/DASH media grabber (M4)" OFF)
option(VELOX_WERROR       "Treat warnings as errors"              ON)

# Central OS detection (docs/adr/0020-cross-platform-strategy.md). Included early: the
# dependency finds below gate Linux-only libraries on VELOX_OS_LINUX.
include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/platform.cmake)

# Project-wide warning flags. Set via add_compile_options (a directory property), not the
# CMAKE_CXX_FLAGS cache variable, because the dev/tsan presets overwrite that cache var
# wholesale for sanitizer flags — a target's warnings must not ride on it.
add_compile_options(-Wall -Wextra -Wpedantic)
if(VELOX_WERROR)
    add_compile_options(-Werror)
endif()

if(VELOX_BUILD_FUZZ AND NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
    message(WARNING "VELOX_BUILD_FUZZ is ON but the compiler is ${CMAKE_CXX_COMPILER_ID}; "
                    "libFuzzer needs Clang. Fuzz targets will be skipped.")
endif()

# --- Dependencies -------------------------------------------------------------------
# Found once here so a missing -dev package fails at configure with a clear name, rather
# than deep in a lane. Each find is gated on the lane that needs it being present.
find_package(Threads REQUIRED)

if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/core/CMakeLists.txt)
    find_package(CURL 8.0 REQUIRED)
    find_package(OpenSSL REQUIRED)
endif()

if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/daemon/CMakeLists.txt)
    find_package(SQLite3 REQUIRED)
    find_package(nlohmann_json 3.11 REQUIRED)
    # libsecret / Secret Service is Linux-only (docs/adr/0020-cross-platform-strategy.md,
    # docs/08-porting.md): macOS uses Keychain behind the same credential-store seam, so
    # this stays REQUIRED on Linux and simply absent elsewhere — PORT's job is to add the
    # macOS side of that seam, not to touch this find.
    if(VELOX_OS_LINUX)
        find_package(PkgConfig REQUIRED)
        pkg_check_modules(LIBSECRET REQUIRED IMPORTED_TARGET libsecret-1)
    endif()
endif()

if(VELOX_BUILD_GUI AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/gui/CMakeLists.txt)
    # DBus (gui/docs/pkg-qa-requests-m1.md R4) backs the org.freedesktop.portal
    # GlobalShortcuts path — Linux/portal-only, same reasoning as libsecret above.
    if(VELOX_OS_LINUX)
        find_package(Qt6 6.6 REQUIRED COMPONENTS Widgets Svg Network DBus LinguistTools)
    else()
        find_package(Qt6 6.6 REQUIRED COMPONENTS Widgets Svg Network LinguistTools)
    endif()
    qt_standard_project_setup()
endif()

if(VELOX_ENABLE_MEDIA)
    find_package(PkgConfig REQUIRED)
    pkg_check_modules(FFMPEG REQUIRED IMPORTED_TARGET
        libavformat libavcodec libavutil)
endif()

# --- Tests --------------------------------------------------------------------------
if(VELOX_BUILD_TESTS)
    enable_testing()
endif()

# --- Lane targets (guarded; see header) -------------------------------------------
foreach(lane IN ITEMS core daemon cli nmhost)
    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${lane}/CMakeLists.txt)
        add_subdirectory(${lane})
    else()
        message(STATUS "velox: lane '${lane}' has not landed a CMakeLists yet — skipping.")
    endif()
endforeach()

if(VELOX_BUILD_GUI)
    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/gui/CMakeLists.txt)
        add_subdirectory(gui)
    else()
        message(STATUS "velox: lane 'gui' has not landed a CMakeLists yet — skipping.")
    endif()
endif()

foreach(toolset tools/testserver tools/bench tools/fuzz tools/mockd)
    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${toolset}/CMakeLists.txt)
        add_subdirectory(${toolset})
    endif()
endforeach()

if(VELOX_BUILD_TESTS)
    foreach(suite tests/conformance tests/integration tests/e2e)
        if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${suite}/CMakeLists.txt)
            add_subdirectory(${suite})
        endif()
    endforeach()
endif()

# --- Install rules (M6 packaging; docs/07-packaging.md; owned by PKG/QA) ------------
#
# Guarded by `if(TARGET ...)`, not by editing each lane's own CMakeLists.txt: install()
# is a packaging concern, and reaching into daemon/CMakeLists.txt (DAEMON's), cli's build
# file (also DAEMON's) or gui/CMakeLists.txt (GUI's) to add it there would cross a lane
# boundary CLAUDE.md draws on purpose. Every target below is defined by its own lane;
# this only says where the packaged binary already built by that lane's rules goes.
#
# libveloxcore is intentionally absent here: it stays a static library linked into each
# binary (user decision, see docs/07-packaging.md) — there is no .so to install.
#
# CMAKE_INSTALL_LIBDIR is multiarch-adjusted (lib/x86_64-linux-gnu/) by GNUInstallDirs on
# Debian; systemd user units and the Mozilla native-messaging directory are NOT
# architecture-specific paths, so those two destinations are written literally
# (lib/systemd/user, lib/mozilla/...) rather than built from that variable.
include(GNUInstallDirs)

if(TARGET veloxd)
    install(TARGETS veloxd RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
    install(FILES ${CMAKE_SOURCE_DIR}/packaging/man/veloxd.8
            DESTINATION ${CMAKE_INSTALL_MANDIR}/man8)
    # velox.socket ships alongside velox.service: DAEMON wired real sd_listen_fds()
    # socket activation (daemon/src/rpc/systemd_activation.cpp) — see
    # packaging/systemd/README.md for the pair's own rationale.
    install(FILES ${CMAKE_SOURCE_DIR}/packaging/systemd/velox.service
                  ${CMAKE_SOURCE_DIR}/packaging/systemd/velox.socket
            DESTINATION lib/systemd/user)
endif()

if(TARGET velox)
    install(TARGETS velox RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
    # DAEMON owns cli/ and its man page (CLAUDE.md); packaging only installs it.
    install(FILES ${CMAKE_SOURCE_DIR}/cli/man/velox.1
            DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
endif()

if(TARGET velox-gui)
    install(TARGETS velox-gui RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
    install(FILES ${CMAKE_SOURCE_DIR}/packaging/man/velox-gui.1
            DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
    install(FILES ${CMAKE_SOURCE_DIR}/packaging/desktop/velox.desktop
            DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
    foreach(iconsize 16 22 24 32 48 64 128 256)
        install(FILES
                ${CMAKE_SOURCE_DIR}/packaging/icons/hicolor/${iconsize}x${iconsize}/apps/velox.png
                DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/${iconsize}x${iconsize}/apps)
    endforeach()
endif()

# nmhost and its manifest are DAEMON's (CLAUDE.md: nmhost/ and packaging/nativehost/).
# This lights up the moment DAEMON's target exists, the same way the add_subdirectory()
# guards above do — no coordinated edit needed when it lands.
if(TARGET velox-nmhost)
    install(TARGETS velox-nmhost RUNTIME DESTINATION libexec/velox)
    install(FILES ${CMAKE_SOURCE_DIR}/packaging/nativehost/com.velox.host.json
            DESTINATION lib/mozilla/native-messaging-hosts)
else()
    message(STATUS "velox: nmhost has not landed yet — native-messaging manifest not installed.")
endif()