#!/usr/bin/env bash
# Illuscape installer
# Usage: ./install.sh [--preset=cc|cs6] [--yes]
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PRESET=""
AUTO_YES=0

# ── Parse args ──────────────────────────────────────────────────────────────
for arg in "$@"; do
    case "$arg" in
        --preset=cc|--preset=cs6) PRESET="${arg#--preset=}" ;;
        --yes|-y)                  AUTO_YES=1 ;;
        --help|-h)
            echo "Usage: ./install.sh [--preset=cc|cs6] [--yes]"
            echo "  --preset=cc   Illustrator CC shortcuts (default)"
            echo "  --preset=cs6  Illustrator CS6 shortcuts"
            echo "  --yes         Skip confirmation prompts"
            exit 0 ;;
        *) echo "Unknown argument: $arg"; exit 1 ;;
    esac
done

# ── Check dependencies ───────────────────────────────────────────────────────
check_deps() {
    if ! command -v inkscape &>/dev/null; then
        echo "✗ Inkscape is not installed. Install Inkscape first, then run Illuscape."
        exit 1
    fi

    local version
    version=$(inkscape --version 2>/dev/null | grep -oP '\d+\.\d+' | head -1)
    local major minor
    IFS='.' read -r major minor <<< "$version"
    # Skip version check if regex couldn't match (non-standard version string)
    if [[ -n "$major" ]] && { (( major < 1 )) || (( major == 1 && minor < 2 )); }; then
        echo "⚠ Inkscape $version detected. Illuscape targets Inkscape 1.2+."
        echo "  Some settings may not apply correctly. Continue anyway? [y/N]"
        [[ $AUTO_YES == 1 ]] || { read -r ans; [[ "$ans" =~ ^[Yy]$ ]] || exit 0; }
    fi

    if ! command -v python3 &>/dev/null; then
        echo "✗ python3 is required. Install it and try again."
        exit 1
    fi
}

# ── Detect platform ──────────────────────────────────────────────────────────
detect_config() {
    source "$SCRIPT_DIR/scripts/detect_platform.sh"
    echo "→ Inkscape config: $INKSCAPE_CONFIG ($INKSCAPE_INSTALL_METHOD)"
}

# ── Backup ───────────────────────────────────────────────────────────────────
backup_config() {
    local backup_dir="${INKSCAPE_CONFIG}.bak-illuscape-$(date +%Y%m%d-%H%M%S)"

    # If any illuscape backup already exists, skip (idempotent)
    if ls "${INKSCAPE_CONFIG}".bak-illuscape-* &>/dev/null; then
        echo "→ Backup already exists — skipping (idempotent)"
        return 0
    fi

    if [[ -d "$INKSCAPE_CONFIG" ]]; then
        cp -r "$INKSCAPE_CONFIG" "$backup_dir"
        echo "→ Backed up to: $backup_dir"
    else
        echo "→ No existing config to back up (fresh install)"
    fi
}

# ── Prompt for preset ────────────────────────────────────────────────────────
choose_preset() {
    [[ -n "$PRESET" ]] && return 0
    echo ""
    echo "Which Illustrator era are you coming from?"
    echo "  [1] CC — current Creative Cloud (default)"
    echo "  [2] CS6 — last perpetual license"
    printf "Choice [1]: "
    if [[ $AUTO_YES == 1 ]]; then
        echo "1 (auto)"
        PRESET="cc"
        return 0
    fi
    read -r choice
    case "${choice:-1}" in
        2) PRESET="cs6" ;;
        *) PRESET="cc"  ;;
    esac
    echo "→ Using preset: $PRESET"
}

# ── Merge preferences ────────────────────────────────────────────────────────
merge_prefs() {
    local prefs_file="$INKSCAPE_CONFIG/preferences.xml"
    python3 "$SCRIPT_DIR/scripts/merge_prefs.py" \
        --prefs "$prefs_file" \
        --patch "$SCRIPT_DIR/config/preferences-patch.xml" \
        --preset "$PRESET"
}

# ── Copy config files ────────────────────────────────────────────────────────
copy_files() {
    mkdir -p \
        "$INKSCAPE_CONFIG/keys" \
        "$INKSCAPE_CONFIG/palettes" \
        "$INKSCAPE_CONFIG/templates" \
        "$INKSCAPE_CONFIG/symbols" \
        "$INKSCAPE_CONFIG/splashscreens"

    cp "$SCRIPT_DIR/config/keys/illustrator-${PRESET}.xml" \
       "$INKSCAPE_CONFIG/keys/"

    cp "$SCRIPT_DIR/config/palettes/"*.gpl "$INKSCAPE_CONFIG/palettes/"
    cp "$SCRIPT_DIR/config/templates/"*.svg "$INKSCAPE_CONFIG/templates/"
    cp "$SCRIPT_DIR/config/symbols/"*.svg   "$INKSCAPE_CONFIG/symbols/"

    echo "→ Config files copied"
}

# ── Install desktop launcher + icons (Linux native only) ─────────────────────
install_desktop() {
    [[ "$INKSCAPE_INSTALL_METHOD" != "native" ]] && return 0

    local app_dir="$HOME/.local/share/applications"
    local icon_src="$SCRIPT_DIR/assets/illuscape.svg"
    local splash_src="$SCRIPT_DIR/assets/splash.svg"
    local icon_sizes=(16 32 48 64 128 256 512)

    mkdir -p "$app_dir"
    cp "$SCRIPT_DIR/assets/org.inkscape.Inkscape.desktop" "$app_dir/"

    # Rasterize icon at each size (prefer rsvg-convert, fall back to Inkscape)
    for size in "${icon_sizes[@]}"; do
        local icon_dir="$HOME/.local/share/icons/hicolor/${size}x${size}/apps"
        mkdir -p "$icon_dir"
        if command -v rsvg-convert &>/dev/null; then
            rsvg-convert -w "$size" -h "$size" "$icon_src" \
                -o "$icon_dir/illuscape.png" 2>/dev/null && continue
        fi
        if command -v inkscape &>/dev/null; then
            # Inkscape 1.x uses --export-filename + --export-type (--export-png removed in 1.0)
            inkscape --export-filename="$icon_dir/illuscape.png" \
                --export-type=png \
                --export-width="$size" --export-height="$size" \
                "$icon_src" 2>/dev/null && continue
        fi
        echo "⚠ Could not rasterize icon at ${size}px (install rsvg-convert for icons)"
    done

    # Splash screen (600x400)
    if command -v rsvg-convert &>/dev/null; then
        rsvg-convert -w 600 -h 400 "$splash_src" \
            -o "$INKSCAPE_CONFIG/splashscreens/illuscape-splash.png" 2>/dev/null || true
    fi

    update-desktop-database "$app_dir" 2>/dev/null || true
    echo "→ Desktop launcher installed"
}

# ── Main ──────────────────────────────────────────────────────────────────────
main() {
    echo "╔══════════════════════════════╗"
    echo "║       Illuscape Installer    ║"
    echo "╚══════════════════════════════╝"
    echo ""

    check_deps
    detect_config
    backup_config
    choose_preset
    merge_prefs
    copy_files
    install_desktop

    echo ""
    echo "✓ Illuscape installed (preset: $PRESET)"
    echo ""
    echo "  Open Inkscape to start using your Illustrator-style workspace."
    echo "  To uninstall: ./uninstall.sh"
    echo ""
}

main