#!/bin/bash

# Path: scripts/go.sh

set -e

BLUE='\033[1;34m'
YELLOW='\033[1;33m'
GREEN='\033[1;32m'
RED='\033[1;31m'
NC='\033[0m'

# 1. Define Custom GVM Root
export GVM_ROOT="$HOME/.programming/go"
BOOTSTRAP_GO="$GVM_ROOT/bootstrap"

echo -e "${BLUE}    LOG:${YELLOW} Setting up Go and GVM in ${GVM_ROOT}...${NC}"

# 2. Install GVM (Manual Method)
# Check for 'scripts' dir instead of '.git', because we are going to delete .git
if [ ! -d "$GVM_ROOT/scripts" ]; then
    echo -e "${BLUE}    LOG:${YELLOW} Cloning GVM...${NC}"
    git clone https://github.com/moovweb/gvm.git "$GVM_ROOT"
    
    # CRITICAL FIX: Remove git metadata so GVM treats this as a valid installation
    rm -rf "$GVM_ROOT/.git"
    
    # Generate the GVM executable script from default
    echo -e "${BLUE}    LOG:${YELLOW} Configuring GVM scripts...${NC}"
    cp "$GVM_ROOT/scripts/gvm-default" "$GVM_ROOT/scripts/gvm"
    sed -i "s|^GVM_ROOT=.*|GVM_ROOT=\"$GVM_ROOT\"|" "$GVM_ROOT/scripts/gvm"
    
    echo -e "${GREEN}    SUCCESS:${NC} GVM cloned and configured."
else
    echo -e "${GREEN}    SKIP:${NC} GVM already installed."
fi

# 3. Install Universal Bootstrap Go
if [ ! -d "$BOOTSTRAP_GO" ]; then
    echo -e "${BLUE}    LOG:${YELLOW} Downloading Bootstrap Go...${NC}"
    mkdir -p "$BOOTSTRAP_GO"
    
    wget -q https://go.dev/dl/go1.20.5.linux-amd64.tar.gz -O /tmp/go-bootstrap.tar.gz
    tar -C "$BOOTSTRAP_GO" -xzf /tmp/go-bootstrap.tar.gz --strip-components=1
    rm /tmp/go-bootstrap.tar.gz
    
    echo -e "${GREEN}    SUCCESS:${NC} Bootstrap Go installed."
else
    echo -e "${GREEN}    SKIP:${NC} Bootstrap Go already exists."
fi

# 4. Configure Environment for Installation
export PATH="$BOOTSTRAP_GO/bin:$PATH"
export GOROOT_BOOTSTRAP="$BOOTSTRAP_GO"

# Source GVM
set +e
source "$GVM_ROOT/scripts/gvm"
set -e

# Verify GVM loaded correctly
if ! command -v gvm &> /dev/null; then
    echo -e "${RED}    ERROR:${NC} GVM failed to load."
    exit 1
fi

# 5. Install Target Version
TARGET_VER="go1.24.11"

if ! gvm list | grep -q "$TARGET_VER"; then
    echo -e "${BLUE}    LOG:${YELLOW} Installing ${TARGET_VER}...${NC}"
    gvm install "$TARGET_VER" --prefer-binary
fi

gvm use "$TARGET_VER" --default

echo -e "${GREEN}    SUCCESS:${NC} Go setup completed."