#!/bin/bash
# validate-dependencies.sh - Service dependency validation
# Part of: lib/
# Purpose: Validate service dependencies before compose up
#
# Expects: SERVICE_IDS, SERVICE_DEPENDS, SERVICE_COMPOSE (from service-registry.sh)
# Provides: validate_service_dependencies()

# Validate that all service dependencies are satisfied
# Returns 0 if all dependencies are met, 1 if any are missing
validate_service_dependencies() {
    local errors=0
    local warnings=0

    # Build list of enabled services (have compose files)
    local -A enabled_services
    for sid in "${SERVICE_IDS[@]}"; do
        local cf="${SERVICE_COMPOSE[$sid]}"
        if [[ -n "$cf" && -f "$cf" ]]; then
            enabled_services[$sid]=1
        fi
    done

    # Core services defined in docker-compose.base.yml are always enabled
    # (they have no extension manifest, so the registry does not know about them)
    local _base_compose="${INSTALL_DIR:-$SCRIPT_DIR}/docker-compose.base.yml"
    if [[ -f "$_base_compose" ]]; then
        local _svc
        while IFS= read -r _svc; do
            enabled_services[$_svc]=1
        done < <(sed -n 's/^  \([a-z][a-z0-9_-]*\):.*/\1/p' "$_base_compose" 2>/dev/null)
    fi

    # Check each enabled service's dependencies
    for sid in "${SERVICE_IDS[@]}"; do
        [[ -z "${enabled_services[$sid]:-}" ]] && continue

        local deps="${SERVICE_DEPENDS[$sid]:-}"
        [[ -z "$deps" ]] && continue

        # Parse space-separated dependency list
        for dep in $deps; do
            if [[ -z "${enabled_services[$dep]:-}" ]]; then
                echo "ERROR: Service '$sid' depends on '$dep', but '$dep' is not enabled" >&2
                errors=$((errors + 1))
            fi
        done
    done

    if [[ $errors -gt 0 ]]; then
        echo "" >&2
        echo "Dependency validation failed: $errors missing dependencies" >&2
        echo "Fix by enabling required services or disabling dependent services" >&2
        return 1
    fi

    return 0
}