#!/usr/bin/env bash
INSTALLED_CBUILD_VERSION=2.1.3

# set \t size to 4 spaces
tabs 4

# exit on errors
set -eo pipefail

function version_parse {
    local value="$1"
    var_name="$2"
    IFS_backup="$IFS"
    IFS='.'
    local v_array=($value)
    IFS="$IFS_backup"
    eval ${var_name}_version_major=${v_array[0]}
    eval ${var_name}_version_minor=${v_array[1]}
    eval ${var_name}_version_patch=${v_array[2]}
}

version_parse $INSTALLED_CBUILD_VERSION installed
if [ -z "$CBUILD_INSTALL_DIR" ]; then
    CBUILD_INSTALL_DIR="$HOME/.local/share/cbuild/${installed_version_major}.${installed_version_minor}"
    if [ ! -f "$CBUILD_INSTALL_DIR/cbuild.sh" ]; then
        CBUILD_INSTALL_DIR="/usr/local/share/cbuild/${installed_version_major}.${installed_version_minor}"
        if [ ! -f "$CBUILD_INSTALL_DIR/cbuild.sh" ]; then
            echo "CBUILD_INSTALL_DIR '$CBUILD_INSTALL_DIR' doesn't exist" 
            exit 1
        fi
    fi
fi

function include {
    local script_path="$1"
    if [[ "$script_path" == cbuild/* ]]; then
        script_path="$CBUILD_INSTALL_DIR/$(echo $script_path | sed 's,^cbuild/,,')"
    fi
    # echp "including script $script_path"
    . "$script_path"
}

include "cbuild/myprint.sh"
include "cbuild/functions.sh"
include "cbuild/config.sh"

function print_help {
    myprint "cbuild v$INSTALLED_CBUILD_VERSION"
    myprint "C/C++ project build system written in bash."
    myprint "Usage: cbuild [OPTIONS] [TASKS]"
    myprint "Options:"
    myprint "    -h, --help               Show this message"
    myprint "    -v, --version            Shows version"
    myprint "    -c, --config FILE        Set project config file path (default=./project.config)"
    myprint "    -n, --new-project [DIR]  Initialize new cbuild project directory (default=./)"
}

# parse command line arguments
project_config_path="./project.config"
args=($@)
args_count=${#args[@]}
selected_tasks_array=()
i=0
if [ $args_count -eq 0 ]; then
    print_help
    exit 1
fi

while [ $i -lt $args_count ]
do
    case "${args[i]}" in
        '-h' | '--help')
            print_help
            exit 0
            ;;
        '-v' | '--version')
            myprint "cbuild v$INSTALLED_CBUILD_VERSION"
            exit 0
            ;;
        '-c' | '--config')
            i=$((i+1))
            project_config_path="${args[i]}"
            ;;
        '-n' | '--new-project')
            i=$((i+1))
            new_project_dir="${args[i]}"
            if [ -z "$new_project_dir" ]; then
                new_project_dir="."
            else
                mkdir -p "$new_project_dir"
            fi
            if ask_yn "create default cbuild project config?"; then
                project_config_path="$new_project_dir/project.config"
                cp "$CBUILD_INSTALL_DIR/default.config" "$project_config_path"
                myprint "Enter project name: "
                read -r project_name
                sed -i "s,\%PROJECT_NAME\%,$project_name,g" "$project_config_path"
                myprint "${GREEN}created config at '$project_config_path'"
            fi
            if ask_yn "Copy default .gitignore?"; then
                cp "$CBUILD_INSTALL_DIR/.gitignore" "$new_project_dir/"
            fi
            exit 0
            ;;
        *)
            selected_tasks_array+=(${args[i]})
            ;;
    esac
    i=$((i+1))
done

function call_task {
    local project_config_path="$1"
    local task="$2"
    TASK_ARGS="$3"

    print_header "${CYAN}" "─" "$PROJECT/$task"
    load_config "$project_config_path" "$task" true

    if [ ! -z "$PRE_TASK_SCRIPT" ]; then
        myprint "${BLUE}executing ${WHITE}$TASK_SCRIPT"
        include "$PRE_TASK_SCRIPT"
    fi

    myprint "${BLUE}executing ${WHITE}$TASK_SCRIPT"
    include "$TASK_SCRIPT"

    if [ ! -z "$POST_TASK_SCRIPT" ]; then
        myprint "${BLUE}executing ${WHITE}$POST_TASK_SCRIPT"
        include "$POST_TASK_SCRIPT"
    fi
}

function call_tasks {
    local tasks="$@"
    load_config "$project_config_path" "" false
    print_header "${WHITE}" "═" "$PROJECT"
    project_dir="$(pwd)"
    for task_str in $tasks ; do
        task=$(safeprint "$task_str" | sed 's/=.*//g')
        local args_str=$(safeprint "$task_str" | grep -oP '(?<=\=).*' || echo "")
        IFS_backup="$IFS"
        IFS=',;'
        args_array=($args_str)
        IFS="$IFS_backup"
        call_task "$project_config_path" "$task" "${args_array[@]}"
        cd "$project_dir"
    done
}

print_hline "${WHITE}" "═"
selected_tasks_count=${#selected_tasks_array[@]}
if [ $selected_tasks_count -gt 0 ]; then
    call_tasks "${selected_tasks_array[@]}"
fi