#!/usr/bin/env bash
# ==============================================================================
# F76.WORLD - Linux & Steam Deck 1-Click Optimizer & INI Deployer
# Target: Fallout 76 (Steam AppID: 1151340 / Proton)
# Game Update: Patch 70 "The Slasher" (v1.7.26.13)
# ==============================================================================
set -e

COLOR_GOLD='\033[38;2;255;176;0m'
COLOR_GREEN='\033[38;2;16;185;129m'
COLOR_CYAN='\033[38;2;6;182;212m'
COLOR_RED='\033[38;2;239;68;68m'
COLOR_RESET='\033[0m'
COLOR_BOLD='\033[1m'

echo -e "${COLOR_GOLD}${COLOR_BOLD}"
echo "  ███████╗███████╗ ██████╗     ██╗    ██╗ ██████╗ ██████╗ ██╗     ██████╗ "
echo "  ██╔════╝╚════██║██╔════╝     ██║    ██║██╔═══██╗██╔══██╗██║     ██╔══██╗"
echo "  █████╗      ██╔╝███████╗     ██║ █╗ ██║██║   ██║██████╔╝██║     ██║  ██║"
echo "  ██╔══╝     ██╔╝ ██╔═══██╗    ██║███╗██║██║   ██║██╔══██╗██║     ██║  ██║"
echo "  ██║        ██║  ╚██████╔╝    ╚███╔███╔╝╚██████╔╝██║  ██║███████╗██████╔╝"
echo "  ╚═╝        ╚═╝   ╚═════╝      ╚══╝╚══╝  ╚═════╝ ╚═╝  ╚═╝╚══════╝╚═════╝ "
echo -e "${COLOR_RESET}"
echo -e "${COLOR_CYAN}  Appalachia Steam Deck & Linux Proton Deployer • Patch 70 Ready${COLOR_RESET}"
echo -e "  Authoritative Webhook: https://f76.world\n"

# Parse Flags
DRY_RUN=false
for arg in "$@"; do
    case $arg in
        --dry-run|--test|-t)
            DRY_RUN=true
            shift
            ;;
        --apply|-y)
            DRY_RUN=false
            shift
            ;;
        --help|-h)
            echo "Usage: ./f76-deck-install.sh [--dry-run|--apply]"
            echo "  --dry-run   Simulates directory scan and diff without writing files."
            echo "  --apply     Creates .bak timestamped backup and installs optimized INI."
            exit 0
            ;;
    esac
done

# If executed interactively without flags, prompt the user
if [ "$DRY_RUN" = false ] && [ -t 0 ] && [ "$1" != "--apply" ]; then
    echo -e "Select execution mode:"
    echo -e "  [1] ${COLOR_GREEN}Dry-Run / Test Safe Run${COLOR_RESET} (Inspect paths & diff, ZERO disk changes)"
    echo -e "  [2] ${COLOR_GOLD}Apply Live Optimization${COLOR_RESET} (Backup existing INI & write new config)"
    read -p "Enter choice [1 or 2, default: 1]: " user_choice
    if [ "$user_choice" != "2" ]; then
        DRY_RUN=true
    fi
    echo ""
fi

# Proton Path Resolution (AppID 1151340)
POSSIBLE_PATHS=(
    "$HOME/.steam/steam/steamapps/compatdata/1151340/pfx/drive_c/users/steamuser/Documents/My Games/Fallout 76"
    "$HOME/.local/share/Steam/steamapps/compatdata/1151340/pfx/drive_c/users/steamuser/Documents/My Games/Fallout 76"
    "$HOME/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/compatdata/1151340/pfx/drive_c/users/steamuser/Documents/My Games/Fallout 76"
    "$HOME/Documents/My Games/Fallout 76"
)

TARGET_DIR=""
for p in "${POSSIBLE_PATHS[@]}"; do
    if [ -d "$p" ]; then
        TARGET_DIR="$p"
        break
    fi
done

# Fallback creation path if none found
if [ -z "$TARGET_DIR" ]; then
    TARGET_DIR="$HOME/.steam/steam/steamapps/compatdata/1151340/pfx/drive_c/users/steamuser/Documents/My Games/Fallout 76"
fi

echo -e "[*] Target Proton Documents Directory: ${COLOR_BOLD}$TARGET_DIR${COLOR_RESET}"

TARGET_INI="$TARGET_DIR/Fallout76Custom.ini"

# Define Optimized INI Payload
read -r -d '' INI_PAYLOAD << 'EOF' || true
; ==============================================================================
; F76.WORLD OPTIMIZED PRESET - PATCH 70 (THE SLASHER) VERIFIED
; Engine Invariant: sResourceArchive2List handles client mods non-destructively
; ==============================================================================

[Display]
iPresentInterval = 0
bFull Screen = 0
bBorderless = 1
fSunUpdateThreshold = 0.5

[Controls]
fMouseHeadingXScale = .021
fMouseHeadingYScale = .021
bMouseAcceleration = 0
fPitchSpeed = 0.0000

[Interface]
fDefaultWorldFOV = 90.0
fDefault1stPersonFOV = 90.0
fSafeZoneX = 15.0
fSafeZoneY = 15.0
fSafeZoneXWide = 64.0
fSafeZoneXWide16x10 = 64.0
fSafeZoneYWide16x10 = 36.0

[General]
sIntroSequence = 
uMainMenuDelayBeforeAllowSkip = 0
bAlwaysActive = 1
uMainMenuMusicAttnmB = 800

[Grass]
iMinGrassSize = 40
bAllowCreateGrass = 1

[ImageSpace]
bMBEnable = 0
bDoRadialBlur = 0

[Pipboy]
fPipboyEffectColorR = 0.1000
fPipboyEffectColorG = 1.0000
fPipboyEffectColorB = 0.3000
fQuickboyEffectColorR = 0.1000
fQuickboyEffectColorG = 1.0000
fQuickboyEffectColorB = 0.3000

[Archive]
bInvalidateOlderFiles = 1
sResourceDataDirsFinal = 
sResourceArchive2List = SeventySix - StaticMeshes.ba2
EOF

if [ "$DRY_RUN" = true ]; then
    echo -e "\n${COLOR_CYAN}[🛡️ DRY-RUN / TEST SAFE RUN ACTIVE]${COLOR_RESET}"
    echo -e "The following configuration WOULD be written to: ${COLOR_BOLD}$TARGET_INI${COLOR_RESET}\n"
    echo -e "${COLOR_GREEN}--- PROPOSED Fallout76Custom.ini ---${COLOR_RESET}"
    echo "$INI_PAYLOAD"
    echo -e "${COLOR_GREEN}-------------------------------------${COLOR_RESET}\n"
    if [ -f "$TARGET_INI" ]; then
        echo -e "${COLOR_GOLD}[i] Existing INI detected.${COLOR_RESET} A backup would be created at: ${TARGET_INI}.bak.$(date +%Y%m%d%H%M%S)"
    else
        echo -e "${COLOR_GOLD}[i] No existing INI file.${COLOR_RESET} File would be created fresh."
    fi
    echo -e "\n${COLOR_GREEN}✔ Dry-run complete. ZERO files modified on disk.${COLOR_RESET}"
    echo -e "To apply these changes, re-run with: ${COLOR_BOLD}curl -sSL https://f76.world/deck | bash -s -- --apply${COLOR_RESET}\n"
    exit 0
fi

# Live Apply Flow
echo -e "\n${COLOR_GOLD}[⚡ APPLYING OPTIMIZATIONS LIVE]${COLOR_RESET}"
mkdir -p "$TARGET_DIR"

if [ -f "$TARGET_INI" ]; then
    BACKUP_FILE="${TARGET_INI}.bak.$(date +%Y%m%d%H%M%S)"
    cp "$TARGET_INI" "$BACKUP_FILE"
    echo -e "${COLOR_GREEN}✔ Created safety backup:${COLOR_RESET} $BACKUP_FILE"
fi

echo "$INI_PAYLOAD" > "$TARGET_INI"
chmod 644 "$TARGET_INI"

echo -e "${COLOR_GREEN}✔ Successfully installed optimized Fallout76Custom.ini!${COLOR_RESET}"
echo -e "  Location: ${COLOR_BOLD}$TARGET_INI${COLOR_RESET}"
echo -e "  Settings: 1:1 Mouse Fix • FPS Unlocked • Intro Skipped • FOV 90 • Safe sResourceArchive2List"
echo -e "\n${COLOR_CYAN}Launch Fallout 76 from Steam to enjoy smooth Appalachian exploration!${COLOR_RESET}\n"