#!/usr/bin/env bash
# ==============================================================
#  browser - Simple browser dispatcher / launcher
# --------------------------------------------------------------
#  Author   : Kris Yotam
#  Contact  : krisyotam@protonmail.com
#  License  : GNU GPLv3
#  Created  : 2025-10-27
# --------------------------------------------------------------
#  Description:
#    Suckless, functionized launcher that routes URLs to the
#    appropriate browser or lets the user pick a browser from a
#    tiny TUI. Usage:
#      browser                 # interactive chooser
#      browser <name>          # launch specific browser (librewolf, brave, tor, surf)
#      browser <url>           # dispatch URL to the preferred browser
#      browser <name> <url>    # open URL with chosen browser
#
#    Dispatch rules (default):
#      - .onion -> TOR
#      - blog platforms (blogspot, medium, wordpress, ghost) -> surf
#      - otherwise -> librewolf
# ==============================================================

set -euo pipefail

# -------------------- Configuration (like config.py header) -----------------
# Commands (override with env vars if needed)
LIBREWOLF_CMD="${LIBREWOLF_CMD:-librewolf}"
BRAVE_CMD="${BRAVE_CMD:-brave-browser}"
TOR_CMD="${TOR_CMD:-torbrowser-launcher}"
SURF_CMD="${SURF_CMD:-surf}"

# Supported friendly names (lowercase)
BROWSERS=(librewolf brave tor surf)

# ---------------------------------------------------------------------------

print_help() {
    cat <<'HELP'
browser - Simple browser dispatcher / launcher

Usage:
  browser                 # interactive chooser
  browser <name>          # launch specific browser (librewolf, brave, tor, surf)
  browser <url>           # dispatch URL to the preferred browser
  browser <name> <url>    # open URL with chosen browser

Examples:
  browser https://example.com
  browser surf https://blog.example.com
  browser brave

HELP
}

choose_one() {
    # choose_one <prompt> <opt1> <opt2> ...
    local prompt="$1"; shift
    local opts=("$@")
    local i=1
    printf "%s\n" "$prompt"
    for o in "${opts[@]}"; do
        printf "  %d) %s\n" "$i" "$o"
        i=$((i+1))
    done
    printf "Choice [1-%d]: " $((i-1))
    local choice
    IFS= read -r choice || choice=''
    if ! printf '%s' "$choice" | grep -qE '^[0-9]+$'; then
        return 1
    fi
    if [ "$choice" -lt 1 ] || [ "$choice" -ge "$i" ]; then
        return 1
    fi
    echo "${opts[$((choice-1))]}"
}

is_url() {
    # crude URL test: contains :// or starts with www. or contains a dot and no spaces
    local s="$1"
    case "$s" in
        *://*|www.*|*.*) return 0 ;;
        *) return 1 ;;
    esac
}

extract_host() {
    # accept full URL or bare host
    local u="$1"
    # strip protocol
    u="${u#*://}"
    # strip path
    u="${u%%/*}"
    # strip port
    u="${u%%:*}"
    printf '%s' "$u"
}

dispatch_url() {
    local url="$1"
    local host
    host=$(extract_host "$url")

    # lower-case host for pattern matching
    local host_lc
    host_lc=$(printf '%s' "$host" | tr '[:upper:]' '[:lower:]')

    case "$host_lc" in
        *.onion)
            launch_browser "tor" "$url" ;;
        *blogspot.*|*medium.*|*wordpress.*|*ghost.*)
            launch_browser "surf" "$url" ;;
        *)
            launch_browser "librewolf" "$url" ;;
    esac
}

launch_browser() {
    # launch_browser <name> [url]
    local name="$1"
    local url="${2:-}"
    local cmd=""

    case "${name,,}" in
        librewolf)
            cmd="$LIBREWOLF_CMD" ;;
        brave)
            cmd="$BRAVE_CMD" ;;
        tor)
            cmd="$TOR_CMD" ;;
        surf)
            cmd="$SURF_CMD" ;;
        *)
            printf "Unknown browser: %s\n" "$name" >&2
            return 2 ;;
    esac

    if [ -n "$url" ]; then
        # prefer to open in background so script exits
        setsid "$cmd" "$url" >/dev/null 2>&1 &
    else
        setsid "$cmd" >/dev/null 2>&1 &
    fi
}

main() {
    if [ "${1:-}" = "--help" ] || [ "${1:-}" = "-h" ]; then
        print_help
        return 0
    fi

    if [ "$#" -eq 0 ]; then
        # interactive chooser
        local choice
        choice=$(choose_one "Choose browser:" "${BROWSERS[@]}") || {
            printf "No valid choice. Exiting.\n"; return 1
        }
        launch_browser "$choice"
        return 0
    fi

    # If first arg matches a browser name -> explicit launch
    local first="${1,,}"
    if printf '%s\n' "${BROWSERS[@]}" | grep -Fxq -- "$first"; then
        if [ "$#" -ge 2 ]; then
            # browser name + url
            launch_browser "$first" "$2"
        else
            launch_browser "$first"
        fi
        return 0
    fi

    # If first arg looks like a url -> dispatch
    if is_url "$1"; then
        dispatch_url "$1"
        return 0
    fi

    # otherwise assume it's a hostname-like argument; dispatch
    dispatch_url "$1"
}

# If executed directly, run main with positional args
if [ "${BASH_SOURCE[0]:-}" = "$0" ]; then
    main "$@"
fi