#!/bin/bash
set -euo pipefail
IFS=$'\n\t'

# Configuration
GIT_REMOTE_NAME="gitea"
GITEA_DOMAIN="gitea.com"
GITEA_SSH="git@$GITEA_DOMAIN"
GITEA_SSH_PORT="22"
GITEA_API="https://$GITEA_DOMAIN/api/v1"
USERNAME="mrhavens"
REPO_ROOT=$(git rev-parse --show-toplevel 2>/dev/null) || { echo "[ERROR] Not inside a git repository. Please run this script from within a git repository." >&2; exit 1; }
REPO_NAME=$(basename "$REPO_ROOT") || { echo "[ERROR] Failed to get repository name" >&2; exit 1; }
MARKDOWN_FILE="$REPO_ROOT/.gitfield/gitea.sigil.md"
DEFAULT_NAME="Mark Randall Havens"
DEFAULT_EMAIL="mark.r.havens@gmail.com"
TOKEN_FILE="$HOME/.gitea_token"
SCRIPT_VERSION="1.0"

# Logging functions
info()  { echo -e "\e[1;34m[INFO]\e[0m $*"; }
warn()  { echo -e "\e[1;33m[WARN]\e[0m $*"; }
error() { echo -e "\e[1;31m[ERROR]\e[0m $*" >&2; exit 1; }

# Check for required tools
info "Checking for required tools..."
for cmd in git curl jq ssh lsb_release; do
  command -v "$cmd" >/dev/null || {
    sudo apt update -qq || warn "Failed to update package lists, continuing..."
    sudo apt install -y git curl jq openssh-client lsb-release || error "Failed to install $cmd"
  }
done

# Handle Gitea token
RESET_TOKEN=false
if [[ "${1:-}" == "--reset-token" ]]; then
  RESET_TOKEN=true
  rm -f "$TOKEN_FILE" 2>/dev/null || warn "Failed to remove token file"
  info "Token reset requested."
fi

if [[ -f "$TOKEN_FILE" && "$RESET_TOKEN" == false ]]; then
  TOKEN=$(cat "$TOKEN_FILE" 2>/dev/null) || error "Failed to read token from $TOKEN_FILE"
  info "Using cached token from $TOKEN_FILE"
else
  echo "🔐 Paste your Gitea Personal Access Token (scopes: write:repository, write:ssh_key)"
  echo "→ Generate at: $GITEA_DOMAIN/user/settings/applications"
  read -rsp "Token: " TOKEN
  echo
  [[ -z "$TOKEN" ]] && error "Token cannot be empty"
  echo "$TOKEN" > "$TOKEN_FILE" || error "Failed to write token to $TOKEN_FILE"
  chmod 600 "$TOKEN_FILE" || error "Failed to set permissions on $TOKEN_FILE"
  info "Token saved at $TOKEN_FILE"
fi

# Set git user info
git config --global user.name "$DEFAULT_NAME" || warn "Failed to set git user name"
git config --global user.email "$DEFAULT_EMAIL" || warn "Failed to set git user email"
info "Git identity set to: $DEFAULT_NAME <$DEFAULT_EMAIL>"

# Ensure at least one commit exists
if ! git rev-parse HEAD &>/dev/null; then
  error "No commits found in the repository. Please add and commit files before running this script."
fi

# SSH setup with default port (22 for Gitea.com)
if [[ ! -f "$HOME/.ssh/id_ed25519" ]]; then
  info "Generating SSH key..."
  ssh-keygen -t ed25519 -C "$DEFAULT_EMAIL" -f "$HOME/.ssh/id_ed25519" -N "" || error "Failed to generate SSH key"
fi

eval "$(ssh-agent -s)" >/dev/null 2>&1 || error "Failed to start ssh-agent"
ssh-add "$HOME/.ssh/id_ed25519" >/dev/null 2>&1 || warn "SSH key already added or could not be added"

# Configure SSH for Gitea.com
SSH_CONFIG_FILE="$HOME/.ssh/config"
if ! grep -q "Host $GITEA_DOMAIN" "$SSH_CONFIG_FILE" 2>/dev/null; then
  mkdir -p "$HOME/.ssh" && chmod 700 "$HOME/.ssh"
  cat >> "$SSH_CONFIG_FILE" <<EOF
Host $GITEA_DOMAIN
  HostName $GITEA_DOMAIN
  User git
  Port $GITEA_SSH_PORT
  IdentityFile $HOME/.ssh/id_ed25519
  StrictHostKeyChecking no
  UserKnownHostsFile /dev/null
EOF
  chmod 600 "$SSH_CONFIG_FILE" || warn "Failed to set permissions on SSH config file"
  info "Added SSH config for $GITEA_DOMAIN with port $GITEA_SSH_PORT"
fi

# SSH key upload to Gitea
set +e
info "Testing SSH connection..."
SSH_TEST_OUTPUT=$(ssh -T -p "$GITEA_SSH_PORT" "$GITEA_SSH" 2>&1)
if ! echo "$SSH_TEST_OUTPUT" | grep -q "successfully authenticated"; then
  warn "SSH test failed, attempting to upload SSH key. Output: $SSH_TEST_OUTPUT"
  PUBKEY=$(cat "$HOME/.ssh/id_ed25519.pub" 2>/dev/null) || error "Failed to read SSH public key"
  TITLE="AutoKey-$(hostname)-$(date +%s 2>/dev/null || echo 'unknown')"
  CURL_OUTPUT=$(curl -s --fail -X POST "$GITEA_API/user/keys" \
    -H "Authorization: token $TOKEN" \
    -H "Content-Type: application/json" \
    -d "{\"title\": \"$TITLE\", \"key\": \"$PUBKEY\", \"read_only\": false}" 2>&1)
  if [[ $? -ne 0 ]]; then
    warn "SSH key upload failed: $CURL_OUTPUT"
  else
    info "SSH key uploaded successfully."
    sleep 2
    SSH_TEST_OUTPUT=$(ssh -T -p "$GITEA_SSH_PORT" "$GITEA_SSH" 2>&1)
    if ! echo "$SSH_TEST_OUTPUT" | grep -q "successfully authenticated"; then
      warn "SSH test still failing after key upload. Output: $SSH_TEST_OUTPUT"
    else
      info "SSH test passed after key upload."
    fi
  fi
else
  info "SSH test passed: $SSH_TEST_OUTPUT"
fi
set -e

# Check and create Gitea repository
info "Checking if repository exists..."
EXISTS=$(curl -s -H "Authorization: token $TOKEN" "$GITEA_API/repos/$USERNAME/$REPO_NAME" | jq -r .name 2>/dev/null || echo "")
if [[ "$EXISTS" != "$REPO_NAME" ]]; then
  info "Creating repository $REPO_NAME on Gitea..."
  CURL_OUTPUT=$(curl -s --fail -X POST "$GITEA_API/user/repos" \
    -H "Authorization: token $TOKEN" \
    -H "Content-Type: application/json" \
    -d "{\"name\": \"$REPO_NAME\", \"description\": \"Created via gitfield-gitea\", \"private\": false}" 2>&1) || {
    warn "Failed to create repository: $CURL_OUTPUT"
    error "Repository creation failed. Check token permissions or network."
  }
  info "Repository created successfully."
fi

# Set up git remote
REMOTE_URL="$GITEA_SSH:$USERNAME/$REPO_NAME.git"
if ! git remote get-url "$GIT_REMOTE_NAME" &>/dev/null; then
  info "Adding remote $GIT_REMOTE_NAME..."
  git remote add "$GIT_REMOTE_NAME" "$REMOTE_URL" || error "Failed to add remote $GIT_REMOTE_NAME"
else
  info "Updating remote $GIT_REMOTE_NAME..."
  git remote set-url "$GIT_REMOTE_NAME" "$REMOTE_URL" || error "Failed to set remote URL for $GIT_REMOTE_NAME"
fi

# Generate metadata file
mkdir -p "$(dirname "$MARKDOWN_FILE")" || error "Failed to create directory for $MARKDOWN_FILE"

TIMESTAMP=$(date '+%Y-%m-%d %H:%M:%S') || error "Failed to get timestamp"
DEFAULT_BRANCH=$(git symbolic-ref --short HEAD) || error "Failed to get default branch"
REPO_PATH="$REPO_ROOT"
LATEST_SHA=$(git rev-parse HEAD) || error "Failed to get latest commit SHA"
LAST_COMMIT_MSG=$(git log -1 --pretty=format:"%s" 2>/dev/null || echo "Unknown")
LAST_COMMIT_DATE=$(git log -1 --pretty=format:"%ad" 2>/dev/null || echo "Unknown")
LAST_COMMIT_AUTHOR=$(git log -1 --pretty=format:"%an <%ae>" 2>/dev/null || echo "Unknown")
TOTAL_COMMITS=$(git rev-list --count HEAD 2>/dev/null || echo "Unknown")
TRACKED_FILES=$(git ls-files 2>/dev/null | wc -l 2>/dev/null || echo "Unknown")
UNCOMMITTED=$(if ! git diff --quiet 2>/dev/null || ! git diff --cached --quiet 2>/dev/null; then echo "Yes"; else echo "No"; fi)
LATEST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "None")
HOSTNAME=$(hostname 2>/dev/null || echo "Unknown")
CURRENT_USER=$(whoami 2>/dev/null || echo "Unknown")
TIMEZONE=$(date +%Z 2>/dev/null || echo "Unknown")
OS_NAME=$(uname -s 2>/dev/null || echo "Unknown")
KERNEL_VERSION=$(uname -r 2>/dev/null || echo "Unknown")
ARCHITECTURE=$(uname -m 2>/dev/null || echo "Unknown")
OS_PRETTY_NAME=$(grep PRETTY_NAME /etc/os-release 2>/dev/null | cut -d= -f2 | tr -d '"' || echo "Unknown")
DOCKER_CHECK=$(grep -qE '/docker|/lxc' /proc/1/cgroup 2>/dev/null && echo "Yes" || echo "No")
WSL_CHECK=$(grep -qi microsoft /proc/version 2>/dev/null && echo "Yes" || echo "No")
VM_CHECK=$(systemd-detect-virt 2>/dev/null || echo "Unknown")
UPTIME=$(uptime -p 2>/dev/null || echo "Unknown")
MAC_ADDR=$(ip link 2>/dev/null | awk '/ether/ {print $2}' | head -n 1 2>/dev/null || echo "Unknown")
LOCAL_IP=$(hostname -I 2>/dev/null | awk '{print $1}' 2>/dev/null || echo "Unknown")
CPU_MODEL=$(grep -m1 'model name' /proc/cpuinfo 2>/dev/null | cut -d: -f2 | sed 's/^ //' 2>/dev/null || echo "Unknown")
RAM_GB=$(awk '/MemTotal/ {printf "%.2f", $2/1024/1024}' /proc/meminfo 2>/dev/null || echo "Unknown")
WEB_LINK="https://$GITEA_DOMAIN/$USERNAME/$REPO_NAME"

cat > "$MARKDOWN_FILE" <<EOF
# 🔗 Gitea Repository Link

- **Repo Name**: \`$REPO_NAME\`
- **Gitea User**: \`$USERNAME\`
- **Remote URL**: [$WEB_LINK]($WEB_LINK)
- **Local Repo Path**: \`$REPO_PATH\`
- **Remote Label**: \`$GIT_REMOTE_NAME\`
- **Default Branch**: \`$DEFAULT_BRANCH\`
- **Repo Created**: \`$TIMESTAMP\`

---

## 📦 Commit Info

- **This Commit Timestamp**: \`$TIMESTAMP\`
- **Last Commit SHA**: \`$LATEST_SHA\`
- **Last Commit Message**: \`$LAST_COMMIT_MSG\`
- **Last Commit Author**: \`$LAST_COMMIT_AUTHOR\`
- **Last Commit Date**: \`$LAST_COMMIT_DATE\`
- **This Commit URL**: [$WEB_LINK/commit/$LATEST_SHA]($WEB_LINK/commit/$LATEST_SHA)

---

## 📊 Repo Status

- **Total Commits**: \`$TOTAL_COMMITS\`
- **Tracked Files**: \`$TRACKED_FILES\`
- **Uncommitted Changes**: \`$UNCOMMITTED\`
- **Latest Tag**: \`$LATEST_TAG\`

---

## 🧭 Environment

- **Host Machine**: \`$HOSTNAME\`
- **Current User**: \`$CURRENT_USER\`
- **Time Zone**: \`$TIMEZONE\`
- **Script Version**: \`$SCRIPT_VERSION\`

---

## 🧬 Hardware & OS Fingerprint

- **OS Name**: \`$OS_NAME\`
- **OS Version**: \`$OS_PRETTY_NAME\`
- **Kernel Version**: \`$KERNEL_VERSION\`
- **Architecture**: \`$ARCHITECTURE\`
- **Running in Docker**: \`$DOCKER_CHECK\`
- **Running in WSL**: \`$WSL_CHECK\`
- **Virtual Machine**: \`$VM_CHECK\`
- **System Uptime**: \`$UPTIME\`
- **MAC Address**: \`$MAC_ADDR\`
- **Local IP**: \`$LOCAL_IP\`
- **CPU Model**: \`$CPU_MODEL\`
- **Total RAM (GB)**: \`$RAM_GB\`

---

_Auto-generated by \`gitfield-gitea\` push script._
EOF
[[ $? -eq 0 ]] || error "Failed to write metadata to $MARKDOWN_FILE"

# Commit and push
set +e
info "Committing markdown file..."
git add "$MARKDOWN_FILE" || warn "Failed to add markdown file"
git commit -m "Gitea metadata link commit at $TIMESTAMP — $WEB_LINK/commit/$LATEST_SHA" || warn "No changes to commit"

info "Pushing to Gitea..."
if ! git config --get branch."$DEFAULT_BRANCH".remote &>/dev/null; then
  git push -u "$GIT_REMOTE_NAME" "$DEFAULT_BRANCH" || {
    warn "Push to Gitea failed. Check SSH setup or network."
    warn "Run 'ssh -T -p $GITEA_SSH_PORT git@$GITEA_DOMAIN' to debug."
  }
else
  git push "$GIT_REMOTE_NAME" "$DEFAULT_BRANCH" || {
    warn "Push to Gitea failed. Check SSH setup or network."
    warn "Run 'ssh -T -p $GITEA_SSH_PORT git@$GITEA_DOMAIN' to debug."
  }
fi
set -e

info "✅ Gitea push complete."
echo -e "\n🔗 View in browser: $WEB_LINK\n"