#!/bin/bash
set -e

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

print_status() { echo -e "${BLUE}[INFO]${NC} $1"; }
print_success() { echo -e "${GREEN}[SUCCESS]${NC} $1"; }
print_warning() { echo -e "${YELLOW}[WARNING]${NC} $1"; }
print_error() { echo -e "${RED}[ERROR]${NC} $1"; }

# Global variables
COMMIT_MESSAGE=""
RELEASE_MODE=false

show_usage() {
    echo "C-Relay Increment and Push Script"
    echo ""
    echo "Usage:"
    echo "  $0 \"commit message\"           - Default: increment patch, commit & push"
    echo "  $0 -r \"commit message\"        - Release: increment minor, create release"
    echo ""
    echo "Examples:"
    echo "  $0 \"Fixed event validation bug\""
    echo "  $0 --release \"Major release with new features\""
    echo ""
    echo "Default Mode (patch increment):"
    echo "  - Increment patch version (v1.2.3 → v1.2.4)"
    echo "  - Git add, commit with message, and push"
    echo ""
    echo "Release Mode (-r flag):"
    echo "  - Increment minor version, zero patch (v1.2.3 → v1.3.0)"
    echo "  - Git add, commit, push, and create Gitea release"
    echo ""
    echo "Requirements for Release Mode:"
    echo "  - Gitea token in ~/.gitea_token for release uploads"
}

# Parse command line arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        -r|--release)
            RELEASE_MODE=true
            shift
            ;;
        -h|--help)
            show_usage
            exit 0
            ;;
        *)
            # First non-flag argument is the commit message
            if [[ -z "$COMMIT_MESSAGE" ]]; then
                COMMIT_MESSAGE="$1"
            fi
            shift
            ;;
    esac
done

# Validate inputs
if [[ -z "$COMMIT_MESSAGE" ]]; then
    print_error "Commit message is required"
    echo ""
    show_usage
    exit 1
fi

# Check if we're in a git repository
check_git_repo() {
    if ! git rev-parse --git-dir > /dev/null 2>&1; then
        print_error "Not in a git repository"
        exit 1
    fi
}

# Function to get current version and increment appropriately
increment_version() {
    local increment_type="$1"  # "patch" or "minor"

    print_status "Getting current version..."

    # Get the highest version tag (not chronologically latest)
    LATEST_TAG=$(git tag -l 'v*.*.*' | sort -V | tail -n 1 || echo "")
    if [[ -z "$LATEST_TAG" ]]; then
        LATEST_TAG="v0.0.0"
        print_warning "No version tags found, starting from $LATEST_TAG"
    fi

    # Extract version components (remove 'v' prefix)
    VERSION=${LATEST_TAG#v}

    # Parse major.minor.patch using regex
    if [[ $VERSION =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
        MAJOR=${BASH_REMATCH[1]}
        MINOR=${BASH_REMATCH[2]}
        PATCH=${BASH_REMATCH[3]}
    else
        print_error "Invalid version format in tag: $LATEST_TAG"
        print_error "Expected format: v0.1.0"
        exit 1
    fi

    # Increment version based on type
    if [[ "$increment_type" == "minor" ]]; then
        # Minor release: increment minor, zero patch
        NEW_MINOR=$((MINOR + 1))
        NEW_PATCH=0
        NEW_VERSION="v${MAJOR}.${NEW_MINOR}.${NEW_PATCH}"
        print_status "Release mode: incrementing minor version"
    else
        # Default: increment patch
        NEW_PATCH=$((PATCH + 1))
        NEW_VERSION="v${MAJOR}.${MINOR}.${NEW_PATCH}"
        print_status "Default mode: incrementing patch version"
    fi

    print_status "Current version: $LATEST_TAG"
    print_status "New version: $NEW_VERSION"

    # Update version in src/main.h
    update_version_in_header "$NEW_VERSION" "$MAJOR" "${NEW_MINOR:-$MINOR}" "${NEW_PATCH:-$PATCH}"

    # Export for use in other functions
    export NEW_VERSION
}

# Function to update version macros in src/main.h
update_version_in_header() {
    local new_version="$1"
    local major="$2"
    local minor="$3"
    local patch="$4"

    print_status "Updating version in src/main.h..."

    # Check if src/main.h exists
    if [[ ! -f "src/main.h" ]]; then
        print_error "src/main.h not found"
        exit 1
    fi

    # Update VERSION macro
    sed -i "s/#define VERSION \".*\"/#define VERSION \"$new_version\"/" src/main.h

    # Update VERSION_MAJOR macro
    sed -i "s/#define VERSION_MAJOR [0-9]\+/#define VERSION_MAJOR $major/" src/main.h

    # Update VERSION_MINOR macro
    sed -i "s/#define VERSION_MINOR .*/#define VERSION_MINOR $minor/" src/main.h

    # Update VERSION_PATCH macro
    sed -i "s/#define VERSION_PATCH [0-9]\+/#define VERSION_PATCH $patch/" src/main.h

    print_success "Updated version in src/main.h to $new_version"
}

# Function to commit and push changes
git_commit_and_push() {
    print_status "Preparing git commit..."

    # Stage all changes
    if git add . > /dev/null 2>&1; then
        print_success "Staged all changes"
    else
        print_error "Failed to stage changes"
        exit 1
    fi

    # Check if there are changes to commit
    if git diff --staged --quiet; then
        print_warning "No changes to commit"
    else
        # Commit changes
        if git commit -m "$NEW_VERSION - $COMMIT_MESSAGE" > /dev/null 2>&1; then
            print_success "Committed changes"
        else
            print_error "Failed to commit changes"
            exit 1
        fi
    fi

    # Create new git tag
    if git tag "$NEW_VERSION" > /dev/null 2>&1; then
        print_success "Created tag: $NEW_VERSION"
    else
        print_warning "Tag $NEW_VERSION already exists"
    fi

    # Push changes and tags
    print_status "Pushing to remote repository..."
    if git push > /dev/null 2>&1; then
        print_success "Pushed changes"
    else
        print_error "Failed to push changes"
        exit 1
    fi

    # Push only the new tag to avoid conflicts with existing tags
    if git push origin "$NEW_VERSION" > /dev/null 2>&1; then
        print_success "Pushed tag: $NEW_VERSION"
    else
        print_warning "Tag push failed, trying force push..."
        if git push --force origin "$NEW_VERSION" > /dev/null 2>&1; then
            print_success "Force-pushed updated tag: $NEW_VERSION"
        else
            print_error "Failed to push tag: $NEW_VERSION"
            exit 1
        fi
    fi
}

# Function to commit and push changes without creating a tag (tag already created)
git_commit_and_push_no_tag() {
    print_status "Preparing git commit..."

    # Stage all changes
    if git add . > /dev/null 2>&1; then
        print_success "Staged all changes"
    else
        print_error "Failed to stage changes"
        exit 1
    fi

    # Check if there are changes to commit
    if git diff --staged --quiet; then
        print_warning "No changes to commit"
    else
        # Commit changes
        if git commit -m "$NEW_VERSION - $COMMIT_MESSAGE" > /dev/null 2>&1; then
            print_success "Committed changes"
        else
            print_error "Failed to commit changes"
            exit 1
        fi
    fi

    # Push changes and tags
    print_status "Pushing to remote repository..."
    if git push > /dev/null 2>&1; then
        print_success "Pushed changes"
    else
        print_error "Failed to push changes"
        exit 1
    fi

    # Push only the new tag to avoid conflicts with existing tags
    if git push origin "$NEW_VERSION" > /dev/null 2>&1; then
        print_success "Pushed tag: $NEW_VERSION"
    else
        print_warning "Tag push failed, trying force push..."
        if git push --force origin "$NEW_VERSION" > /dev/null 2>&1; then
            print_success "Force-pushed updated tag: $NEW_VERSION"
        else
            print_error "Failed to push tag: $NEW_VERSION"
            exit 1
        fi
    fi
}

# Function to create Gitea release
create_gitea_release() {
    print_status "Creating Gitea release..."

    # Check for Gitea token
    if [[ ! -f "$HOME/.gitea_token" ]]; then
        print_warning "No ~/.gitea_token found. Skipping release creation."
        print_warning "Create ~/.gitea_token with your Gitea access token to enable releases."
        return 0
    fi

    local token=$(cat "$HOME/.gitea_token" | tr -d '\n\r')
    local api_url="https://git.laantungir.net/api/v1/repos/laantungir/c-relay"

    # Create release
    print_status "Creating release $NEW_VERSION..."
    local response=$(curl -s -X POST "$api_url/releases" \
         -H "Authorization: token $token" \
         -H "Content-Type: application/json" \
         -d "{\"tag_name\": \"$NEW_VERSION\", \"name\": \"$NEW_VERSION\", \"body\": \"$COMMIT_MESSAGE\"}")

    if echo "$response" | grep -q '"id"'; then
        print_success "Created release $NEW_VERSION"
        return 0
    elif echo "$response" | grep -q "already exists"; then
        print_warning "Release $NEW_VERSION already exists"
        return 0
    else
        print_error "Failed to create release $NEW_VERSION"
        print_error "Response: $response"

        # Try to check if the release exists anyway
        print_status "Checking if release exists..."
        local check_response=$(curl -s -H "Authorization: token $token" "$api_url/releases/tags/$NEW_VERSION")
        if echo "$check_response" | grep -q '"id"'; then
            print_warning "Release exists but creation response was unexpected"
            return 0
        else
            print_error "Release does not exist and creation failed"
            return 1
        fi
    fi
}

# Main execution
main() {
    print_status "C-Relay Increment and Push Script"

    # Check prerequisites
    check_git_repo

    if [[ "$RELEASE_MODE" == true ]]; then
        print_status "=== RELEASE MODE ==="

        # Increment minor version for releases
        increment_version "minor"

        # Create new git tag BEFORE compilation so version.h picks it up
        if git tag "$NEW_VERSION" > /dev/null 2>&1; then
            print_success "Created tag: $NEW_VERSION"
        else
            print_warning "Tag $NEW_VERSION already exists, removing and recreating..."
            git tag -d "$NEW_VERSION" > /dev/null 2>&1
            git tag "$NEW_VERSION" > /dev/null 2>&1
        fi

        # Commit and push (but skip tag creation since we already did it)
        git_commit_and_push_no_tag

        # Create Gitea release
        if create_gitea_release; then
            print_success "Release $NEW_VERSION completed successfully!"
        else
            print_error "Release creation failed"
        fi

    else
        print_status "=== DEFAULT MODE ==="

        # Increment patch version for regular commits
        increment_version "patch"

        # Create new git tag BEFORE compilation so version.h picks it up
        if git tag "$NEW_VERSION" > /dev/null 2>&1; then
            print_success "Created tag: $NEW_VERSION"
        else
            print_warning "Tag $NEW_VERSION already exists, removing and recreating..."
            git tag -d "$NEW_VERSION" > /dev/null 2>&1
            git tag "$NEW_VERSION" > /dev/null 2>&1
        fi

        # Commit and push (but skip tag creation since we already did it)
        git_commit_and_push_no_tag

        print_success "Increment and push completed successfully!"
        print_status "Version $NEW_VERSION pushed to repository"
    fi
}

# Execute main function
main