#!/usr/bin/env bash
# ═══════════════════════════════════════════════════════════════════════════
# GyanDoot v2.0 — Cross-Platform Universal Installer
# ═══════════════════════════════════════════════════════════════════════════
#
# Detects: macOS (arm64/x86_64), Linux (x86_64/aarch64/i686),
#          WSL (Windows Subsystem for Linux), Windows (Git Bash/MSYS2)
#
# Usage:
#   curl -fsSL https://git.gyannetra.in/gnpl_admin/gyandoot-release/raw/main/install.sh | bash
#
# Or locally:
#   ./install.sh
# ═══════════════════════════════════════════════════════════════════════════

set -euo pipefail

# ─── Colors ──────────────────────────────────────────────────────────────
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
CYAN='\033[0;36m'
NC='\033[0m'

info()  { echo -e "${BLUE}[INFO]${NC} $*"; }
ok()    { echo -e "${GREEN}[OK]${NC} $*"; }
warn()  { echo -e "${YELLOW}[WARN]${NC} $*"; }
err()   { echo -e "${RED}[ERR]${NC} $*" >&2; exit 1; }
banner() {
    echo -e "${CYAN}"
    echo '  ______   __ _    _   _ ____   ___   ___ _____ '
    echo ' / ___\ \ / // \  | \ | |  _ \ / _ \ / _ \_   _|'
    echo '| |  _ \ V // _ \ |  \| | | | | | | | | | || |  '
    echo '| |_| | | |/ ___ \| |\  | |_| | |_| | |_| || |  '
    echo ' \____| |_/_/   \_\_| \_|____/ \___/ \___/ |_|  '
    echo -e "${NC}"
    echo -e "${GREEN}  GyanDoot v2.0 — Knowledge Messenger${NC}"
    echo "  Cross-Platform Universal Installer"
    echo ""
}

# ─── Platform Detection ──────────────────────────────────────────────────
detect_architecture() {
    local arch
    arch="$(uname -m)"
    case "$arch" in
        x86_64|amd64)  echo "x86_64" ;;
        aarch64|arm64) echo "aarch64" ;;
        i686|i386)     echo "i686" ;;
        *) err "Unsupported architecture: $arch" ;;
    esac
}

detect_os() {
    local os
    os="$(uname -s)"
    case "$os" in
        Linux)  echo "linux" ;;
        Darwin) echo "darwin" ;;
        CYGWIN*|MINGW*|MSYS*) echo "windows" ;;
        *) err "Unsupported OS: $os" ;;
    esac
}

detect_wsl() {
    if [ -f /proc/version ] && grep -qiE 'microsoft|wsl' /proc/version 2>/dev/null; then
        return 0
    fi
    return 1
}

get_shell_profile() {
    case "$SHELL" in
        */zsh) echo "$HOME/.zshrc" ;;
        */bash) echo "$HOME/.bashrc" ;;
        */fish) echo "$HOME/.config/fish/config.fish" ;;
        *) echo "$HOME/.profile" ;;
    esac
}

# ─── Dependency Installers ───────────────────────────────────────────────

install_rust_if_needed() {
    if ! command -v cargo &>/dev/null; then
        info "Rust toolchain not found. Installing..."
        if [ "$(uname -s)" = "Darwin" ] || [ "$(uname -s)" = "Linux" ]; then
            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
            source "$HOME/.cargo/env"
        elif [[ "$(uname -s)" =~ ^(CYGWIN|MINGW|MSYS) ]]; then
            # Windows: download rustup-init.exe
            powershell -Command "& {Invoke-WebRequest -Uri https://win.rustup.rs -OutFile '%TEMP%\rustup-init.exe'; Start-Process '%TEMP%\rustup-init.exe' -Wait -ArgumentList '-y'}"
            export PATH="$PATH:$HOME/.cargo/bin"
        else
            err "No Rust install method for this platform"
        fi
        ok "Rust installed ($(cargo --version))"
    else
        ok "Rust already installed ($(cargo --version))"
    fi
}

install_node_if_needed() {
    if ! command -v node &>/dev/null; then
        info "Node.js not found. Installing..."
        if command -v nvm &>/dev/null || [ -s "$HOME/.nvm/nvm.sh" ]; then
            [ -s "$HOME/.nvm/nvm.sh" ] && \. "$HOME/.nvm/nvm.sh"
            nvm install 22 2>/dev/null || nvm install node
        elif [ "$(uname -s)" = "Darwin" ]; then
            if command -v brew &>/dev/null; then
                brew install node
            else
                warn "Install Node.js manually: https://nodejs.org"
            fi
        elif [[ "$(uname -s)" =~ ^(CYGWIN|MINGW|MSYS) ]]; then
            warn "Install Node.js from: https://nodejs.org"
        else
            # Linux: use nvm
            curl -fsSL https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.0/install.sh | bash
            [ -s "$HOME/.nvm/nvm.sh" ] && \. "$HOME/.nvm/nvm.sh"
            nvm install 22
        fi
        ok "Node.js installed ($(node --version))"
    else
        ok "Node.js already installed ($(node --version))"
    fi

    # Ensure npx is available
    if ! command -v npx &>/dev/null; then
        warn "npx not found. Installing corepack..."
        npm install -g npx 2>/dev/null || true
    fi
}

# ─── Linux System Dependencies ───────────────────────────────────────────
# Camoufox (Playwright-based) needs these on Linux/WSL
CAMOUFOX_LINUX_DEPS=(
    libgtk-3-0 libnss3 libnspr4 libatk1.0-0t64
    libatk-bridge2.0-0t64 libcups2t64 libdrm2
    libxkbcommon0 libxcomposite1 libxdamage1
    libxfixes3 libxrandr2 libgbm1 libpango-1.0-0
    libcairo2 libasound2t64 libxcb-shm0
    libx11-xcb1 libx11-6 libxcb1 libxext6
    libxcursor1 libxi6 libfreetype6 libfontconfig1
    libxshmfence1 libxrender1 libdbus-1-3
)

install_linux_deps() {
    if [ "$(uname -s)" != "Linux" ]; then
        return 0
    fi

    if detect_wsl; then
        info "WSL detected. Installing Linux system dependencies..."
    fi

    local missing=()
    if command -v dpkg-query &>/dev/null; then
        for pkg in "${CAMOUFOX_LINUX_DEPS[@]}"; do
            if ! dpkg-query -W -f='${Status}' "$pkg" 2>/dev/null | grep -q "install ok installed"; then
                local alt_pkg="${pkg%t64}"
                if [ "$alt_pkg" != "$pkg" ] && dpkg-query -W -f='${Status}' "$alt_pkg" 2>/dev/null | grep -q "install ok installed"; then
                    continue
                fi
                missing+=("$pkg")
            fi
        done
    else
        missing=("${CAMOUFOX_LINUX_DEPS[@]}")
    fi

    if [ ${#missing[@]} -eq 0 ]; then
        info "All Linux system dependencies already installed"
        return 0
    fi

    info "Installing ${#missing[@]} missing Linux system dependencies..."
    if command -v apt-get &>/dev/null; then
        if command -v sudo &>/dev/null; then
            sudo apt-get update -qq 2>/dev/null || true
            sudo apt-get install -y -qq "${missing[@]}" 2>/dev/null || {
                warn "Some packages failed. Retrying with fix..."
                sudo apt-get --fix-broken install -y -qq 2>/dev/null || true
                local fallback=()
                for pkg in "${missing[@]}"; do
                    local alt="${pkg%t64}"
                    [ "$alt" != "$pkg" ] && fallback+=("$alt")
                done
                [ ${#fallback[@]} -gt 0 ] && sudo apt-get install -y -qq "${fallback[@]}" 2>/dev/null || true
            }
        else
            apt-get update -qq 2>/dev/null || true
            apt-get install -y -qq "${missing[@]}" 2>/dev/null || true
        fi
        ok "Linux system dependencies installed"
    elif command -v dnf &>/dev/null; then
        sudo dnf install -y nss nspr atk at-spi2-atk cups-libs \
            libdrm libXcomposite libXdamage libXrandr mesa-libgbm \
            pango alsa-lib libxkbcommon libxcb libX11-xcb libX11 \
            libXext libXcursor libXfixes libXi gtk3 cairo-gobject 2>/dev/null || true
        ok "Linux system dependencies installed"
    elif command -v yum &>/dev/null; then
        sudo yum install -y nss nspr atk at-spi2-atk cups-libs \
            libdrm libXcomposite libXdamage libXrandr mesa-libgbm \
            pango alsa-lib libxkbcommon 2>/dev/null || true
        ok "Linux system dependencies installed"
    else
        warn "No supported package manager. Install deps manually."
        warn "Required: ${CAMOUFOX_LINUX_DEPS[*]}"
    fi
}

# ─── Camoufox Browser Installer ──────────────────────────────────────────
install_camoufox_browser() {
    info "Installing Camoufox browser (anti-detection engine)..."

    install_linux_deps

    if ! command -v npx &>/dev/null && ! command -v npm &>/dev/null; then
        warn "Node.js not found. Skipping Camoufox install."
        warn "Install Node.js and re-run: npm install -g camoufox-browser@0.1.0"
        return 0
    fi

    # Step 1: Install npm package
    info "Installing npm package (camoufox-browser@0.1.0)..."
    npm install -g camoufox-browser@0.1.0 2>&1 | tail -3 || {
        warn "npm install failed. Try manually: npm install -g camoufox-browser@0.1.0"
        return 0
    }

    # Step 2: Download browser binary
    info "Downloading Camoufox browser binary (~311MB)..."
    npx --yes camoufox-js@0.11.0 fetch 2>&1 || {
        warn "Download failed. Try manually: npx --yes camoufox-js@0.11.0 fetch"
        return 0
    }

    # Step 3: macOS — remove Gatekeeper quarantine
    if [ "$(uname -s)" = "Darwin" ]; then
        if command -v xattr &>/dev/null; then
            info "Removing macOS quarantine from Camoufox..."
            xattr -dr com.apple.quarantine ~/Library/Caches/camoufox 2>/dev/null || true
        fi
    fi

    # Step 4: Verify
    local cache_dir
    if [ "$(uname -s)" = "Darwin" ]; then
        cache_dir="$HOME/Library/Caches/camoufox"
    else
        cache_dir="$HOME/.cache/camoufox"
    fi

    if [ -f "$cache_dir/version.json" ]; then
        ok "Camoufox browser installed ($(du -sh "$cache_dir" 2>/dev/null | cut -f1))"
    else
        warn "Browser binary not found. Run manually: npx --yes camoufox-js@0.11.0 fetch"
    fi
}

# ─── Build GyanDoot ──────────────────────────────────────────────────────
build_gyandoot() {
    local root_dir
    root_dir="$(cd "$(dirname "$0")" 2>/dev/null && pwd || echo "$PWD")"

    # Find workspace root (where Cargo.toml with [workspace] is)
    cd "$root_dir"
    while [ "$PWD" != "/" ]; do
        if [ -f "Cargo.toml" ] && grep -q '\[workspace\]' Cargo.toml 2>/dev/null; then
            info "Found workspace root at $PWD"
            break
        fi
        cd ..
    done

    if [ "$PWD" = "/" ]; then
        err "Could not find Cargo workspace. Make sure you're in the gyandoot-v2 directory."
    fi

    info "Building GyanDoot v2.0 (release mode)..."
    cargo build --release 2>&1 | tail -5
    ok "Build complete ($(du -sh target/release/gyandoot* 2>/dev/null | cut -f1))"
}

# ─── Install Binary ──────────────────────────────────────────────────────
install_binary() {
    local target_dir="$PWD/target/release"
    local bin_name="gyandoot"

    if [ -f "$target_dir/gyandoot.exe" ]; then
        bin_name="gyandoot.exe"
    fi

    if [ ! -f "$target_dir/$bin_name" ]; then
        err "Binary not found at $target_dir/$bin_name"
    fi

    local os
    os="$(uname -s)"
    local install_dir=""
    local installed_to=""

    case "$os" in
        Darwin|Linux)
            # Priority: ~/.cargo/bin/ → /usr/local/bin → ~/.local/bin/
            if [ -d "$HOME/.cargo/bin" ] && echo "$PATH" | grep -q "$HOME/.cargo/bin"; then
                install_dir="$HOME/.cargo/bin"
            elif [ -d "/usr/local/bin" ]; then
                if [ -w "/usr/local/bin" ]; then
                    install_dir="/usr/local/bin"
                else
                    info "Need sudo to install to /usr/local/bin"
                    sudo cp "$target_dir/$bin_name" "/usr/local/bin/$bin_name"
                    sudo chmod +x "/usr/local/bin/$bin_name"
                    install_dir="/usr/local/bin"
                fi
            elif [ -d "$HOME/.local/bin" ] && echo "$PATH" | grep -q "$HOME/.local/bin"; then
                install_dir="$HOME/.local/bin"
            else
                mkdir -p "$HOME/.cargo/bin"
                install_dir="$HOME/.cargo/bin"
                if ! echo "$PATH" | grep -q "$HOME/.cargo/bin"; then
                    warn "Add ~/.cargo/bin to your PATH in $(get_shell_profile):"
                    echo "  export PATH=\"\$HOME/.cargo/bin:\$PATH\""
                fi
            fi

            if [ -n "$install_dir" ]; then
                cp "$target_dir/$bin_name" "$install_dir/$bin_name"
                chmod +x "$install_dir/$bin_name"
                installed_to="$install_dir/$bin_name"
            fi
            ;;
        CYGWIN*|MINGW*|MSYS*)
            install_dir="/usr/local/bin"
            cp "$target_dir/$bin_name" "$install_dir/$bin_name"
            chmod +x "$install_dir/$bin_name"
            installed_to="$install_dir/$bin_name"
            ;;
        *)
            err "Unsupported OS: $os"
            ;;
    esac

    ok "Installed to $installed_to"

    # ── Verify PATH resolution ──────────────────────────────────────────
    local cmd_path
    cmd_path="$(command -v gyandoot 2>/dev/null || true)"
    if [ -z "$cmd_path" ]; then
        warn "'gyandoot' not found in PATH. Use: $installed_to"
    elif [ "$cmd_path" != "$installed_to" ]; then
        warn "OLD binary at '$cmd_path' takes priority over '$installed_to'."
        warn "Remove old: sudo rm $cmd_path || rm $cmd_path"
        warn "Then 'gyandoot run' will use the new version."
    else
        ok "'gyandoot' resolves to the newly installed binary."
    fi
}

# ─── Post-Install Summary ────────────────────────────────────────────────
print_post_install() {
    echo ""
    ok "GyanDoot v2.0 installed successfully!"
    echo ""
    echo "╔═══════════════════════════════════════════════════════════╗"
    echo "║  Quick Start                                            ║"
    echo "╠═══════════════════════════════════════════════════════════╣"
    echo "║  gyandoot --help         Show all commands              ║"
    echo "║  gyandoot setup          Interactive config wizard      ║"
    echo "║  gyandoot run            Start interactive agent        ║"
    echo "╠═══════════════════════════════════════════════════════════╣"
    echo "║  Browser Tools (anti-detection):                        ║"
    echo "║  gyandoot browser health  Check Camoufox status         ║"
    echo "║  gyandoot browser search  Search the web                ║"
    echo "║  gyandoot browser browse  Visit a website               ║"
    echo "╠═══════════════════════════════════════════════════════════╣"
    echo "║  Service Management:                                    ║"
    echo "║  gyandoot service install  Auto-start on boot           ║"
    echo "║  gyandoot service status   Check service status         ║"
    echo "╚═══════════════════════════════════════════════════════════╝"
    echo ""

    if [ "$(uname -s)" = "Darwin" ]; then
        echo "  🍎 macOS — Camoufox Gatekeeper (one-time):"
        echo "     xattr -dr com.apple.quarantine ~/Library/Caches/camoufox"
        echo ""
    fi

    if detect_wsl; then
        echo "  ⚠️  WSL detected — Node.js must be installed INSIDE WSL."
        echo "     (The Windows-side Node.js is not accessible from WSL.)"
        echo ""
    fi
}

# ─── Service Installation Prompt ─────────────────────────────────────────
prompt_service_install() {
    echo "────────────────────────────────────────────"
    echo "  Optional: Auto-start GyanDoot on Boot?"
    echo "────────────────────────────────────────────"
    echo "  GyanDoot can run as a system service and"
    echo "  start automatically when your computer boots."
    echo ""
    echo "  (You can also do this later: gyandoot service install)"
    echo ""
    read -r -p "  Install system service? [y/N]: " response
    case "$response" in
        [yY]|[yY][eE][sS])
            info "Installing GyanDoot system service..."
            gyandoot service install 2>&1 || warn "Service install failed (run later: gyandoot service install)"
            ;;
        *)
            info "Skipping service install"
            ;;
    esac
}

# ═══════════════════════════════════════════════════════════════════════════
# MAIN
# ═══════════════════════════════════════════════════════════════════════════
main() {
    banner

    local os arch
    os=$(detect_os)
    arch=$(detect_architecture)
    info "Detected: $os / $arch"

    if detect_wsl; then
        info "WSL (Windows Subsystem for Linux) detected"
    fi

    # ── Install dependencies ───────────────────────────────────────────
    info "Phase 1: Checking prerequisites..."
    install_rust_if_needed
    install_node_if_needed

    # ── Install Camoufox browser ───────────────────────────────────────
    info "Phase 2: Installing Camoufox browser..."
    install_camoufox_browser

    # ── Build from source ──────────────────────────────────────────────
    info "Phase 3: Building GyanDoot..."
    build_gyandoot

    # ── Install binary ─────────────────────────────────────────────────
    info "Phase 4: Installing binary..."
    install_binary

    # ── Optional: system service ───────────────────────────────────────
    info "Phase 5: Service setup..."
    prompt_service_install

    # ── Done ───────────────────────────────────────────────────────────
    print_post_install
}

main "$@"