#!/usr/bin/env bash
CBUILD_VERSION=2.1.2
CONFIG_VERSION=7

PROJECT="GraphC"
CMP_C="gcc"
CMP_CPP="g++"
STD_C="c11"
STD_CPP="c++17"
WARN_C="-Wall -Wno-discarded-qualifiers -Wextra -Wno-unused-parameter"
WARN_CPP="-Wall -Wextra -Wno-unused-parameter"
SRC_C="$(find src -name '*.c')"
SRC_CPP="$(find src -name '*.cpp')"

# Directory with dependency configs.
# See cbuild/example_dependency_configs
DEPENDENCY_CONFIGS_DIR='dependencies'
# List of dependency config files in DEPENDENCY_CONFIGS_DIR separated by space.
ENABLED_DEPENDENCIES='precompiled kerep imgui imnodes'

# OBJDIR structure:
#  ├── objects/      - Compiled object files. Cleans on each call of build task
#  ├── static_libs/  - Symbolic links to static libraries used by linker. Cleans on each call of build task.
#  ├── static_libs/  - Symbolic links to dynamic libraries used by linker. Cleans on each call of build task.
#  └── profile/      - gcc *.gcda profiling info files
OBJDIR="obj"
OUTDIR="bin"
STATIC_LIB_FILE="lib$PROJECT.a"

# header include directories
INCLUDE="-I./dependencies/imgui -I./dependencies/include/SDL2"

# OS-specific options
case "$OS" in
    WINDOWS)
        EXEC_FILE="$PROJECT.exe"
        SHARED_LIB_FILE="$PROJECT.dll"
        LINKER_LIBS="-lopengl32 -lpthread -lws2_32"
        ;;
    LINUX)
        EXEC_FILE="$PROJECT"
        SHARED_LIB_FILE="$PROJECT.so"
        LINKER_LIBS="-lSDL2 -lGL"
        ;;
    *)
        error "operating system $OS has no configuration variants"
        ;;
esac

# TASKS
case "$TASK" in
    # writes ttf fonts fron ./fonts/ to C compressed arrays in C source files
    # builds static library from font arrays definitions
    embed_fonts)
        SRC_CPP=""
        SRC_C=""
        C_ARGS="-O0 -fpic"
        WARN_C="-Wno-unused-const-variable"
        CPP_ARGS="$C_ARGS"
        STATIC_LIB_FILE="fonts_embedded.a"
        TASK_SCRIPT=tasks/embed_fonts.sh
        ;;

    # creates executable using profile info generated by build_profile
    build_exec)
        # -flto applies more optimizations across object files
        # -flto=auto is needed to multithreaded copilation
        # -fuse-linker-plugin is required to use static libs with lto, it strips away all
        C_ARGS="-O2 -flto=auto -fuse-linker-plugin"
        #-fprofile-use -fprofile-prefix-path=$(realpath $OBJDIR)/objects
        CPP_ARGS="$C_ARGS"
        LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
        PRE_TASK_SCRIPT=
        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
        ;;
    # creates executable with debug info and no optimizations
    build_exec_dbg)
        C_ARGS="-O0 -g -DDEBUG=1"
        CPP_ARGS="$C_ARGS"
        LINKER_ARGS="$CPP_ARGS $LINKER_LIBS"
        PRE_TASK_SCRIPT=
        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
        ;;
    # executes $EXEC_FILE
    exec)
        TASK_SCRIPT=cbuild/default_tasks/exec.sh
        ;;
     # executes $EXEC_FILE with valgrind memory checker
    valgrind)  
        VALGRIND_ARGS="-s --log-file=valgrind.log --read-var-info=yes --track-origins=yes --fullpath-after=$(pwd) --leak-check=full --show-leak-kinds=all" 
        TASK_SCRIPT=cbuild/default_tasks/valgrind.sh
        ;;
    # generates profiling info
    profile)
        OUTDIR="$OUTDIR/profile"
        # -flto applies more optimizations across object files
        # -flto=auto is needed to multithreaded copilation
        # -fuse-linker-plugin is required to use static libs with lto
        # -pg adds code to executable, that generates file containing function call info (gmon.out)
        # -fprofile-generate generates executable with profiling code
        # -fprofile-prefix-path sets path where profiling info about objects will be saved
        C_ARGS="-O2 -flto=auto -fuse-linker-plugin -fprofile-generate -fprofile-prefix-path=$(realpath $OBJDIR)/objects"
        CPP_ARGS="$C_ARGS"
        LINKER_ARGS="$CPP_ARGS"
        PRE_TASK_SCRIPT=
        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
        POST_TASK_SCRIPT=cbuild/default_tasks/profile.sh
        ;;
    # compiles program with -pg and runs it with gprof
    # uses gprof2dot python script to generate function call tree (pip install gprof2dot)
    # requires graphviz (https://www.graphviz.org/download/source/)
    gprof)
        OUTDIR="$OUTDIR/gprof"
        # -pg adds code to executable, that generates file containing function call info (gmon.out)
        C_ARGS="-O2 -flto=auto -fuse-linker-plugin -pg"
        CPP_ARGS="$C_ARGS"
        LINKER_ARGS="$CPP_ARGS"
        PRE_TASK_SCRIPT=
        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
        POST_TASK_SCRIPT=cbuild/default_tasks/gprof.sh
        ;;
    # compiles executable with sanitizers and executes it to find errors and warnings
    sanitize)
        OUTDIR="$OUTDIR/sanitize"
        C_ARGS="-O0 -g3 -fsanitize=undefined,address"
        CPP_ARGS="$C_ARGS"
        LINKER_ARGS="$CPP_ARGS"
        PRE_TASK_SCRIPT=
        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
        POST_TASK_SCRIPT=cbuild/default_tasks/exec.sh
        ;;
    # compiles program and runs it with callgrind (part of valgrind)
    # uses gprof2dot python script to generate function call tree (pip install gprof2dot)
    # requires graphviz (https://www.graphviz.org/download/source/)
    # P.S. detailed results can be viewed in KCacheGrind
    callgrind)
        OUTDIR="$OUTDIR/callgrind"
        # -pg adds code to executable, that generates file containing function call info (gmon.out)
        C_ARGS="-O2 -flto=auto -fuse-linker-plugin"
        CPP_ARGS="$C_ARGS"
        LINKER_ARGS="$CPP_ARGS"
        PRE_TASK_SCRIPT=
        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
        POST_TASK_SCRIPT=cbuild/default_tasks/callgrind.sh
        ;;
    # deletes generated files
    clean)
        TASK_SCRIPT=cbuild/default_tasks/clean.sh
        POST_TASK_SCRIPT=tasks/clean_additions.sh
        ;;
    # nothing to do
    "" | no_task)
        ;;
    # unknown task
    *)
        error "task <$TASK> not found"
    ;;
esac