#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Copyright (c) 2013-2026 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
# Protected by the BSD3 license. Please read bellow for details.
#
# * Redistribution and use in source and binary forms,
# * with or without modification, are permitted provided
# * that the following conditions are met:
# *
# *   Redistributions of source code must retain the above
# *   copyright notice, this list of conditions and the
# *   following disclaimer.
# *
# *   Redistributions in binary form must reproduce the above
# *   copyright notice, this list of conditions and the following
# *   disclaimer in the documentation and/or other materials
# *   provided with the distribution.
# *
# *   Neither the name of the copyright holder nor the names
# *   of any other contributors may be used to endorse or
# *   promote products derived from this software without
# *   specific prior written permission.
# *
# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# * OF SUCH DAMAGE.
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# Save or update a key=value pair in a section of the profile configuration file.
# The user configuration ($HOME/.profile.conf) is updated when it exists,
# otherwise the installation configuration ($PROFILE_CONF or $MYPATH/profile.conf)
# is used.  The section header is created automatically when absent.
#
# Usage: conf_save <section> <key> <value>
#   section : INI section name without brackets, e.g. "prompt" for [prompt]
#   key     : variable name to set (alphanumeric and underscore only)
#   value   : value to assign (may be empty)
conf_save()
{
    if [[ $# -ne 3 ]]; then
        disp E "Usage: conf_save <section> <key> <value>"
        return 1
    fi

    local section="$1" key="$2" value="$3"

    if ! [[ "$section" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]]; then
        disp E "conf_save: invalid section name '${section}' (alphanumeric and underscore only)."
        return 1
    fi
    if ! [[ "$key" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]]; then
        disp E "conf_save: invalid key name '${key}' (alphanumeric and underscore only)."
        return 1
    fi

    local conf_file
    if [[ -f "$HOME/.profile.conf" ]]; then
        conf_file="$HOME/.profile.conf"
    else
        conf_file="${PROFILE_CONF:-${MYPATH}/profile.conf}"
    fi

    local conf_dir="${conf_file%/*}"
    [[ -d "$conf_dir" ]] || mkdir -p "$conf_dir" || {
        disp E "conf_save: unable to create configuration directory: ${conf_dir}"
        return 1
    }

    if [[ ! -e "$conf_file" ]]; then
        {
            printf "[%s]\n" "$section"
            printf "%s=%s\n" "$key" "$value"
        } > "$conf_file" || {
            disp E "conf_save: unable to write configuration file: ${conf_file}"
            return 1
        }
        return 0
    fi

    local tmp_file="${conf_file}.tmp.$$"
    awk -v sec="$section" -v key="$key" -v val="$value" '
        BEGIN {
            in_sec  = 0
            saw_sec = 0
            wrote   = 0
        }

        {
            if ($0 ~ /^\[[^]]+\][[:space:]]*$/) {
                if (in_sec && !wrote) {
                    print key "=" val
                    wrote = 1
                }

                if ($0 ~ ("^\\[" sec "\\][[:space:]]*$")) {
                    in_sec  = 1
                    saw_sec = 1
                } else {
                    in_sec = 0
                }

                print
                next
            }

            if (in_sec && $0 ~ ("^[[:space:]]*" key "[[:space:]]*=")) {
                if (!wrote) {
                    print key "=" val
                    wrote = 1
                }
                next
            }

            print
        }

        END {
            if (in_sec && !wrote) {
                print key "=" val
            }
            if (!saw_sec) {
                print ""
                print "[" sec "]"
                print key "=" val
            }
        }
    ' "$conf_file" > "$tmp_file" || {
        rm -f "$tmp_file"
        disp E "conf_save: unable to update configuration file: ${conf_file}"
        return 1
    }

    mv "$tmp_file" "$conf_file" || {
        rm -f "$tmp_file"
        disp E "conf_save: unable to replace configuration file: ${conf_file}"
        return 1
    }
}
export -f conf_save
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Display the profile configuration file, with optional section and key filters.
# The same file resolution as conf_save is used: $HOME/.profile.conf when
# present, otherwise $PROFILE_CONF or $MYPATH/profile.conf.
#
# Usage: conf_dump [options] [pattern]
#   -s, --section NAME  : Only display the given section
#   pattern             : Only display keys whose name contains this substring
conf_dump()
{
    local section="" key_pattern=""

    local PARSED
    PARSED=$(getopt -o hs: --long help,section: -n 'conf_dump' -- "$@")
    # shellcheck disable=SC2181
    if [[ $? -ne 0 ]]; then
        disp E "Invalid options, use \"conf_dump --help\" to display usage."
        return 1
    fi
    eval set -- "$PARSED"

    while true; do
        case "$1" in
            -h|--help)
                printf "conf_dump: Display the profile configuration file, with optional filters.\n\n"
                printf "Usage: conf_dump [options] [pattern]\n\n"
                printf "Options:\n"
                printf "\t-h, --help\t\tDisplay this help screen\n"
                printf "\t-s, --section NAME\tOnly display the given section\n\n"
                printf "Arguments:\n"
                printf "\tpattern\tOnly display keys whose name contains this substring\n"
                return 0
                ;;
            -s|--section)
                section="$2"
                shift 2
                ;;
            --)
                shift
                break
                ;;
        esac
    done

    [[ $# -gt 0 ]] && key_pattern="$1"

    local conf_file
    if [[ -f "$HOME/.profile.conf" ]]; then
        conf_file="$HOME/.profile.conf"
    else
        conf_file="${PROFILE_CONF:-${MYPATH}/profile.conf}"
    fi

    if [[ ! -f "$conf_file" ]]; then
        disp E "conf_dump: configuration file not found: ${conf_file}"
        return 1
    fi

    # Colours are passed via ENVIRON to avoid awk -v escape interpretation.
    _CONF_DUMP_SEC="${Blue:-}" \
    _CONF_DUMP_KEY="${BIWhite:-}" \
    _CONF_DUMP_RST="${RESETCOL:-}" \
    awk -v sec_filter="$section" -v key_filter="$key_pattern" '
        BEGIN {
            c_sec = ENVIRON["_CONF_DUMP_SEC"]
            c_key = ENVIRON["_CONF_DUMP_KEY"]
            c_rst = ENVIRON["_CONF_DUMP_RST"]
            in_target  = 0
            current_sec = ""
            hdr_printed = 0
            found       = 0
        }

        {
            sub(/\r$/, "")

            if ($0 ~ /^\[[^]]+\][[:space:]]*$/) {
                current_sec = $0
                sub(/^\[/, "",              current_sec)
                sub(/\][[:space:]]*$/, "",  current_sec)
                in_target   = (sec_filter == "" || current_sec == sec_filter)
                hdr_printed = 0
                next
            }

            if (!in_target) next
            if ($0 !~ /^[[:space:]]*[A-Za-z_][A-Za-z0-9_]*[[:space:]]*=/) next

            key = $0; sub(/[[:space:]]*=.*$/, "", key); sub(/^[[:space:]]*/, "", key)
            val = $0; sub(/^[^=]*=/, "", val)

            if (key_filter != "" && index(key, key_filter) == 0) next

            if (!hdr_printed) {
                if (found) print ""
                print c_sec "[" current_sec "]" c_rst
                hdr_printed = 1
                found = 1
            }
            print "  " c_key key c_rst "=" val
        }
    ' "$conf_file"
}
export -f conf_dump
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Set TERM to the best terminal capability available on this system.
# Called automatically at sourcing time.
#
# If TERM is already set to a specific value (not empty, not the sentinel
# "smart"), it is honoured as-is — standard Unix behaviour.
# If TERM is empty or set to "smart", terminal emulator hints are checked first
# (COLORTERM, TERM_PROGRAM, VTE_VERSION, WT_SESSION, TMUX, STY), then terminfo
# is probed in preference order: xterm-256color → xterm-color → xterm → vt100.
#
# Usage: term_set
term_set()
{
    local _current="${TERM:-}"

    # Specific value already set — nothing to do.
    if [[ -n "$_current" && "$_current" != "smart" ]]; then
        export TERM="$_current"
        return 0
    fi

    # Return true when terminfo has an entry for the given terminal type.
    local _term_has
    _term_has() { tput -T "$1" longname >/dev/null 2>&1; }

    local _candidate=""

    # 1. Explicit truecolor hint set by modern terminal emulators.
    if [[ "${COLORTERM:-}" == "truecolor" || "${COLORTERM:-}" == "24bit" ]]; then
        local _t
        for _t in xterm-direct xterm-256color; do
            _term_has "$_t" && { _candidate="$_t"; break; }
        done
    fi

    # 2. Terminal programme name hints.
    if [[ -z "$_candidate" ]]; then
        case "${TERM_PROGRAM:-}" in
            iTerm.app)
                _term_has "xterm-256color" && _candidate="xterm-256color"
                ;;
            WezTerm)
                _term_has "wezterm"        && _candidate="wezterm"
                [[ -z "$_candidate" ]] && _term_has "xterm-256color" && _candidate="xterm-256color"
                ;;
            Hyper|vscode)
                _term_has "xterm-256color" && _candidate="xterm-256color"
                ;;
        esac
    fi

    # 3. VTE-based terminals (GNOME Terminal, Tilix, Xfce Terminal, …).
    if [[ -z "$_candidate" && -n "${VTE_VERSION:-}" ]]; then
        _term_has "vte-256color"  && _candidate="vte-256color"
        [[ -z "$_candidate" ]] && _term_has "xterm-256color" && _candidate="xterm-256color"
    fi

    # 4. Windows Terminal.
    if [[ -z "$_candidate" && -n "${WT_SESSION:-}" ]]; then
        _term_has "xterm-256color" && _candidate="xterm-256color"
    fi

    # 5. tmux — prefer tmux-256color, fall back to screen-256color.
    if [[ -z "$_candidate" && -n "${TMUX:-}" ]]; then
        _term_has "tmux-256color"  && _candidate="tmux-256color"
        [[ -z "$_candidate" ]] && _term_has "screen-256color" && _candidate="screen-256color"
    fi

    # 6. GNU screen — prefer screen-256color, fall back to screen.
    if [[ -z "$_candidate" && -n "${STY:-}" ]]; then
        _term_has "screen-256color" && _candidate="screen-256color"
        [[ -z "$_candidate" ]] && _term_has "screen" && _candidate="screen"
    fi

    # 7. Generic terminfo probe in preference order.
    if [[ -z "$_candidate" ]]; then
        local _t
        for _t in xterm-256color xterm-color xterm vt100; do
            _term_has "$_t" && { _candidate="$_t"; break; }
        done
    fi

    unset -f _term_has

    export TERM="${_candidate:-vt100}"
}
export -f term_set
# ------------------------------------------------------------------------------


term_set


# EOF