#!/bin/bash
#
# Version Bumping Library - Lilith Platform Versioning
#
# Format: <major>.<merges>.<builds>
# - major: Manual increment for breaking changes
# - merges: Incremented by workflow/finish on worktree merge
# - builds: Incremented by release-deploy.sh before sync to releases
#
# Source of truth: codebase/VERSION.json (single version for entire platform)
#

set -e
set -u

# Find VERSION.json - always at codebase root
find_version_file() {
    local SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
    local CODEBASE_ROOT="$(cd "$SCRIPT_DIR/../../../codebase" && pwd)"
    echo "$CODEBASE_ROOT/VERSION.json"
}

VERSION_FILE="$(find_version_file)"

get_last_version() {
    if [ -f "$VERSION_FILE" ]; then
        jq -r '.version' "$VERSION_FILE"
    else
        echo "0.0.0"
    fi
}

read_version_json() {
    if [ -f "$VERSION_FILE" ]; then
        cat "$VERSION_FILE"
    else
        echo '{"major": 0, "merges": 0, "builds": 0, "version": "0.0.0"}'
    fi
}

# Increment builds counter (called before sync to releases)
increment_builds() {
    local JSON=$(read_version_json)
    local MAJOR=$(echo "$JSON" | jq -r '.major')
    local MERGES=$(echo "$JSON" | jq -r '.merges')
    local BUILDS=$(echo "$JSON" | jq -r '.builds')

    BUILDS=$((BUILDS + 1))
    local NEW_VERSION="$MAJOR.$MERGES.$BUILDS"

    jq --arg v "$NEW_VERSION" \
       --argjson builds "$BUILDS" \
       --arg lastBuild "$(date -Iseconds)" \
       '.builds = $builds | .version = $v | .lastBuild = $lastBuild' \
       "$VERSION_FILE" > "$VERSION_FILE.tmp" && mv "$VERSION_FILE.tmp" "$VERSION_FILE"

    echo "$NEW_VERSION"
}

# Increment merges counter (called by workflow/finish)
increment_merges() {
    local WORKTREE_NAME="${1:-unknown}"
    local JSON=$(read_version_json)
    local MAJOR=$(echo "$JSON" | jq -r '.major')
    local MERGES=$(echo "$JSON" | jq -r '.merges')
    local BUILDS=$(echo "$JSON" | jq -r '.builds')

    MERGES=$((MERGES + 1))
    local NEW_VERSION="$MAJOR.$MERGES.$BUILDS"

    jq --arg v "$NEW_VERSION" \
       --argjson merges "$MERGES" \
       --arg lastMerge "$WORKTREE_NAME" \
       '.merges = $merges | .version = $v | .lastMerge = $lastMerge' \
       "$VERSION_FILE" > "$VERSION_FILE.tmp" && mv "$VERSION_FILE.tmp" "$VERSION_FILE"

    echo "$NEW_VERSION"
}

# Bump major version (manual, resets counters)
bump_major() {
    local JSON=$(read_version_json)
    local MAJOR=$(echo "$JSON" | jq -r '.major')

    MAJOR=$((MAJOR + 1))
    local NEW_VERSION="$MAJOR.0.0"

    jq --arg v "$NEW_VERSION" \
       --argjson major "$MAJOR" \
       '.major = $major | .merges = 0 | .builds = 0 | .version = $v' \
       "$VERSION_FILE" > "$VERSION_FILE.tmp" && mv "$VERSION_FILE.tmp" "$VERSION_FILE"

    echo "$NEW_VERSION"
}

# Legacy compatibility functions
determine_bump_type() {
    # Always return "build" - we use builds counter now
    echo "build"
}

bump_version() {
    local CURRENT="$1"
    local BUMP_TYPE="$2"

    # For release process, increment builds
    increment_builds
}

create_version_tag() {
    local NEW_VERSION="$1"
    local COMMIT_MESSAGE="$2"

    # Create annotated tag
    git tag -a "v$NEW_VERSION" -m "Release v$NEW_VERSION

$COMMIT_MESSAGE"

    echo "v$NEW_VERSION"
}

get_version_changelog() {
    local LAST_TAG="$1"
    local NEW_TAG="$2"

    cat <<EOF
## Changes from $LAST_TAG to $NEW_TAG

### Commits
$(git log ${LAST_TAG}..HEAD --oneline --no-merges 2>/dev/null | head -20 | sed 's/^/- /' || echo "- None")

Total commits: $(git log ${LAST_TAG}..HEAD --oneline --no-merges 2>/dev/null | wc -l || echo "0")
EOF
}

# Export functions
export -f find_version_file
export -f get_last_version
export -f read_version_json
export -f increment_builds
export -f increment_merges
export -f bump_major
export -f determine_bump_type
export -f bump_version
export -f create_version_tag
export -f get_version_changelog