<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use App\Models\SpatialPlanning;
use App\Models\RetributionProposal;
use App\Services\RetributionProposalService;
use Illuminate\Support\Facades\DB;
use Exception;

class CalculateRetributionProposalsCommand extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'retribution:calculate-proposals 
                            {--force : Force recalculate existing proposals}
                            {--limit= : Limit number of spatial plannings to process}
                            {--skip-existing : Skip spatial plannings that already have proposals}
                            {--dry-run : Show what would be processed without actually creating proposals}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Calculate retribution proposals for all spatial plannings';

    protected RetributionProposalService $proposalService;

    public function __construct(RetributionProposalService $proposalService)
    {
        parent::__construct();
        $this->proposalService = $proposalService;
    }

    /**
     * Execute the console command.
     */
    public function handle()
    {
        $this->info('🧮 Starting Retribution Proposal Calculation...');
        $this->newLine();

        try {
            // Get processing options
            $force = $this->option('force');
            $limit = $this->option('limit') ? (int) $this->option('limit') : null;
            $skipExisting = $this->option('skip-existing');
            $dryRun = $this->option('dry-run');

            // Build query for spatial plannings
            $query = SpatialPlanning::query();

            if ($skipExisting && !$force) {
                $query->whereDoesntHave('retributionProposals');
            }

            if ($limit) {
                $query->limit($limit);
            }

            $spatialPlannings = $query->get();
            $totalCount = $spatialPlannings->count();

            if ($totalCount === 0) {
                $this->warn('No spatial plannings found to process.');
                return 0;
            }

            // Show processing summary
            $this->info("📊 PROCESSING SUMMARY:");
            $this->info("   Total Spatial Plannings: {$totalCount}");
            $this->info("   Force Recalculate: " . ($force ? 'Yes' : 'No'));
            $this->info("   Skip Existing: " . ($skipExisting ? 'Yes' : 'No'));
            $this->info("   Dry Run: " . ($dryRun ? 'Yes' : 'No'));
            $this->newLine();

            if ($dryRun) {
                $this->showDryRunPreview($spatialPlannings);
                return 0;
            }

            // Confirm processing
            if (!$this->confirm("Process {$totalCount} spatial plannings?")) {
                $this->info('Operation cancelled.');
                return 0;
            }

            // Process spatial plannings
            $this->processRetributionCalculations($spatialPlannings, $force);

            return 0;

        } catch (Exception $e) {
            $this->error('Error during retribution calculation: ' . $e->getMessage());
            return 1;
        }
    }

    /**
     * Show dry run preview
     */
    private function showDryRunPreview($spatialPlannings)
    {
        $this->info('🔍 DRY RUN PREVIEW:');
        $this->newLine();

        $processable = 0;
        $withProposals = 0;
        $withoutFunction = 0;
        $withoutArea = 0;

        foreach ($spatialPlannings as $spatial) {
            $hasProposals = $spatial->retributionProposals()->exists();
            $buildingFunction = $this->proposalService->detectBuildingFunction($spatial->getBuildingFunctionText());
            $area = $spatial->getCalculationArea();

            if ($hasProposals) {
                $withProposals++;
            }

            if (!$buildingFunction) {
                $withoutFunction++;
            }

            if ($area <= 0) {
                $withoutArea++;
            }

            if ($buildingFunction && $area > 0) {
                $processable++;
            }
        }

        $this->table(
            ['Status', 'Count', 'Description'],
            [
                ['✅ Processable', $processable, 'Can create retribution proposals'],
                ['🔄 With Existing Proposals', $withProposals, 'Already have proposals (will skip unless --force)'],
                ['❌ Missing Building Function', $withoutFunction, 'Cannot detect building function'],
                ['❌ Missing Area', $withoutArea, 'Area is zero or missing'],
            ]
        );

        $this->newLine();
        $this->info("💡 To process: php artisan retribution:calculate-proposals");
        $this->info("💡 To force recalculate: php artisan retribution:calculate-proposals --force");
    }

    /**
     * Process retribution calculations
     */
    private function processRetributionCalculations($spatialPlannings, $force)
    {
        $progressBar = $this->output->createProgressBar($spatialPlannings->count());
        $progressBar->start();

        $stats = [
            'processed' => 0,
            'skipped' => 0,
            'errors' => 0,
            'created_proposals' => 0
        ];

        foreach ($spatialPlannings as $spatial) {
            try {
                $result = $this->processSingleSpatialPlanning($spatial, $force);
                
                if ($result['status'] === 'processed') {
                    $stats['processed']++;
                    $stats['created_proposals'] += $result['proposals_created'];
                } elseif ($result['status'] === 'skipped') {
                    $stats['skipped']++;
                } else {
                    $stats['errors']++;
                }

            } catch (Exception $e) {
                $stats['errors']++;
                $this->newLine();
                $this->error("Error processing spatial planning ID {$spatial->id}: " . $e->getMessage());
            }

            $progressBar->advance();
        }

        $progressBar->finish();
        $this->newLine(2);

        // Show final statistics
        $this->showFinalStatistics($stats);
    }

    /**
     * Process single spatial planning
     */
    private function processSingleSpatialPlanning(SpatialPlanning $spatial, $force)
    {
        // Check if already has proposals
        if (!$force && $spatial->retributionProposals()->exists()) {
            return ['status' => 'skipped', 'reason' => 'already_has_proposals'];
        }

        // Detect building function
        $buildingFunction = $this->proposalService->detectBuildingFunction($spatial->getBuildingFunctionText());
        if (!$buildingFunction) {
            return ['status' => 'error', 'reason' => 'no_building_function'];
        }

        // Get area
        $totalArea = $spatial->getCalculationArea();
        if ($totalArea <= 0) {
            return ['status' => 'error', 'reason' => 'no_area'];
        }

        // Get number of floors
        $numberOfFloors = max(1, $spatial->number_of_floors ?? 1);

        // Delete existing proposals if force mode
        if ($force) {
            $spatial->retributionProposals()->delete();
        }

        $proposalsCreated = 0;

        // Create proposals for each floor
        for ($floor = 1; $floor <= $numberOfFloors; $floor++) {
            // Calculate floor area (distribute total area across floors)
            $floorArea = $totalArea / $numberOfFloors;

            // Create retribution proposal
            $proposal = $this->proposalService->createProposalForSpatialPlanning(
                $spatial,
                $buildingFunction->id,
                $floor,
                $floorArea,
                $totalArea,
                "Auto-generated from spatial planning calculation"
            );

            if ($proposal) {
                $proposalsCreated++;
            }
        }

        return [
            'status' => 'processed',
            'proposals_created' => $proposalsCreated
        ];
    }

    /**
     * Show final statistics
     */
    private function showFinalStatistics($stats)
    {
        $this->info('✅ CALCULATION COMPLETED!');
        $this->newLine();

        $this->table(
            ['Metric', 'Count'],
            [
                ['Processed Successfully', $stats['processed']],
                ['Skipped (Already Exists)', $stats['skipped']],
                ['Errors', $stats['errors']],
                ['Total Proposals Created', $stats['created_proposals']],
            ]
        );

        if ($stats['errors'] > 0) {
            $this->newLine();
            $this->warn("⚠️  {$stats['errors']} spatial plannings had errors:");
            $this->warn("   • Missing building function detection");
            $this->warn("   • Missing or zero area");
            $this->warn("   • Other calculation errors");
        }

        if ($stats['processed'] > 0) {
            $this->newLine();
            $this->info("🎉 Successfully created {$stats['created_proposals']} retribution proposals!");
            $this->info("💡 You can view them using: php artisan retribution:list-proposals");
        }
    }
}