<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Models\Job;
use App\Repositories\CampaignRepository;
use App\Repositories\JobAuditRepository;
use App\Repositories\JobRepository;
use App\Repositories\JobTypeRepository;
use App\Services\FileImportService;
use App\Services\GoogleSheetImportService;
use App\ViewModels\JobViewModel;
use Core\Controller;
use Core\Request;
use Core\Response;
use Core\Validator;

class JobController extends Controller
{
    public function index(): Response
    {
        $request = Request::capture();
        $model = new JobViewModel();
        $model->saved   = $request->input('saved') === '1';
        $model->deleted = $request->input('deleted') === '1';

        return $this->view('jobs.index', [
            'model'     => $model,
            'pageTitle' => $model->title,
        ]);
    }

    public function data(): Response
    {
        return $this->json($this->formatJobRows($this->repo()->allWithDetails()));
    }

    public function dataForCampaign(string $campaignId): Response
    {
        return $this->json($this->formatJobRows(
            $this->repo()->allWithDetailsForCampaign((int) $campaignId)
        ));
    }

    public function campaign(string $campaignId): Response
    {
        $campaign = $this->campaignRepo()->findWithType((int) $campaignId);

        if ($campaign === null) {
            return $this->redirect('/campaigns');
        }

        return $this->view('jobs.campaign', [
            'campaign'  => $campaign,
            'jobTypes'  => $this->loadJobTypes(),
            'pageTitle' => 'Campaign #' . $campaignId . ' Jobs',
        ]);
    }

    public function googleSheetsList(string $campaignId): Response
    {
        if ($this->campaignRepo()->find((int) $campaignId) === null) {
            return Response::json(['error' => 'Campaign not found.'], 404);
        }

        $request = Request::capture();
        if (!verify_csrf_token((string) $request->input('_token', ''))) {
            return Response::json(['error' => 'Your form session expired. Please refresh and try again.'], 419);
        }

        $url = trim((string) $request->input('sheet_url', ''));
        if ($url === '') {
            return Response::json(['error' => 'Enter a Google Sheets URL.'], 422);
        }

        try {
            return Response::json($this->googleSheets()->sheets($url));
        } catch (\Throwable $e) {
            return Response::json(['error' => $e->getMessage()], 422);
        }
    }

    public function importGoogleSheet(string $campaignId): Response
    {
        if ($this->campaignRepo()->find((int) $campaignId) === null) {
            return Response::json(['error' => 'Campaign not found.'], 404);
        }

        $request = Request::capture();
        if (!verify_csrf_token((string) $request->input('_token', ''))) {
            return Response::json(['error' => 'Your form session expired. Please refresh and try again.'], 419);
        }

        $url = trim((string) $request->input('sheet_url', ''));
        $gid = trim((string) $request->input('sheet_gid', ''));
        $jobTypeId = (int) $request->input('job_type_id', 0);
        $jobType = $this->jtRepo()->find($jobTypeId);

        if ($url === '' || $gid === '' || $jobType === null) {
            return Response::json(['error' => 'Select a Google Sheets file, sheet, and job type.'], 422);
        }

        try {
            $sheet = $this->googleSheets()->rows($url, $gid);
            $attributes = json_decode((string) ($jobType['attributes'] ?? '[]'), true) ?? [];
            $result = $this->importRows(
                (int) $campaignId,
                $jobTypeId,
                $attributes,
                $sheet['headers'],
                $sheet['rows']
            );

            return Response::json($result);
        } catch (\Throwable $e) {
            return Response::json(['error' => $e->getMessage()], 422);
        }
    }

    public function create(): Response
    {
        $model = new JobViewModel();
        $model->title    = 'New Job';
        $model->campaigns = $this->loadCampaigns();
        $model->jobTypes  = $this->loadJobTypes();

        return $this->view('jobs.create', [
            'model'     => $model,
            'pageTitle' => $model->title,
        ]);
    }

    public function store(): Response
    {
        $request = Request::capture();
        $model   = new JobViewModel();
        $model->title     = 'New Job';
        $model->campaigns = $this->loadCampaigns();
        $model->jobTypes  = $this->loadJobTypes();

        [$form, $errors] = $this->validateForm($request, $model->jobTypes);

        if (!empty($errors)) {
            $model->form   = $form;
            $model->errors = $errors;

            return $this->view('jobs.create', [
                'model'     => $model,
                'pageTitle' => $model->title,
            ]);
        }

        $job                  = new Job();
        $job->campaignId      = (int) $form['campaign_id'];
        $job->jobTypeId       = (int) $form['job_type_id'];
        $job->attributeValues = $form['attribute_values'];

        $this->repo()->create($job);

        $inserted = $this->repo()->findLatestByCampaignAndType($job->campaignId, $job->jobTypeId);
        if ($inserted !== null) {
            $this->auditRepo()->log((int) $inserted['id'], 'I', $this->toAuditFields($inserted), $this->currentUsername());
        }

        return $this->redirect('/jobs?saved=1');
    }

    public function edit(string $id): Response
    {
        $row = $this->repo()->findWithDetails((int) $id);

        if ($row === null) {
            return $this->redirect('/jobs');
        }

        $storedValues = !empty($row['attribute_values'])
            ? (json_decode((string) $row['attribute_values'], true) ?? [])
            : [];

        $model = new JobViewModel();
        $model->title     = 'Edit Job';
        $model->job       = $row;
        $model->saved     = Request::capture()->input('saved') === '1';
        $model->campaigns = $this->loadCampaigns();
        $model->jobTypes  = $this->loadJobTypes();
        $model->form      = [
            'campaign_id'      => (int) $row['campaign_id'],
            'job_type_id'      => (int) $row['job_type_id'],
            'attribute_values' => $storedValues,
        ];

        return $this->view('jobs.edit', [
            'model'     => $model,
            'pageTitle' => $model->title,
        ]);
    }

    public function update(string $id): Response
    {
        $before = $this->repo()->findWithDetails((int) $id);

        if ($before === null) {
            return $this->redirect('/jobs');
        }

        $request = Request::capture();
        $model   = new JobViewModel();
        $model->title     = 'Edit Job';
        $model->job       = $before;
        $model->campaigns = $this->loadCampaigns();
        $model->jobTypes  = $this->loadJobTypes();

        [$form, $errors] = $this->validateForm($request, $model->jobTypes);

        if (!empty($errors)) {
            $model->form   = $form;
            $model->errors = $errors;

            return $this->view('jobs.edit', [
                'model'     => $model,
                'pageTitle' => $model->title,
            ]);
        }

        $job                  = new Job();
        $job->id              = (int) $id;
        $job->campaignId      = (int) $form['campaign_id'];
        $job->jobTypeId       = (int) $form['job_type_id'];
        $job->attributeValues = $form['attribute_values'];

        $this->repo()->update($job);

        $after = $this->repo()->findWithDetails((int) $id);
        $this->auditRepo()->log((int) $id, 'U', [
            'before' => $this->toAuditFields($before),
            'after'  => $this->toAuditFields($after ?? []),
        ], $this->currentUsername());

        return $this->redirect('/jobs/' . $id . '/edit?saved=1');
    }

    public function destroy(string $id): Response
    {
        $row = $this->repo()->findWithDetails((int) $id);

        if ($row !== null) {
            $this->repo()->delete((int) $id);
            $this->auditRepo()->log((int) $row['id'], 'D', $this->toAuditFields($row), $this->currentUsername());
        }

        return $this->redirect('/jobs?deleted=1');
    }

    // ── Helpers ───────────────────────────────────────────────────────────────

    private function loadCampaigns(): array
    {
        return $this->campaignRepo()->allWithType();
    }

    private function loadJobTypes(): array
    {
        return array_map(static function (array $t): array {
            return [
                'id'         => (int)    $t['id'],
                'name'       => (string) $t['name'],
                'attributes' => json_decode((string) ($t['attributes'] ?? '[]'), true) ?? [],
            ];
        }, $this->jtRepo()->allOrderedByName());
    }

    private function attributesForType(int $typeId, array $types): array
    {
        foreach ($types as $type) {
            if ($type['id'] === $typeId) return $type['attributes'];
        }
        return [];
    }

    /**
     * @param  list<array{name?: string, type?: string, order?: int}> $attributes
     * @param  list<string> $headers
     * @param  list<array<string, string>> $rows
     * @return array{imported: int, skipped: int, matched_attributes: list<string>}
     */
    private function importRows(int $campaignId, int $jobTypeId, array $attributes, array $headers, array $rows): array
    {
        $headersByName = [];
        foreach ($headers as $header) {
            $normalized = $this->normalizeImportHeader($header);
            if ($normalized !== '') {
                $headersByName[$normalized] = $header;
            }
        }

        $matchedAttributes = [];
        foreach ($attributes as $attribute) {
            $name = trim((string) ($attribute['name'] ?? ''));
            if ($name === '') {
                continue;
            }

            $header = $headersByName[$this->normalizeImportHeader($name)] ?? null;
            if ($header !== null) {
                $matchedAttributes[$name] = $header;
            }
        }

        if ($matchedAttributes === []) {
            throw new \RuntimeException('No sheet headers matched the selected job type attributes.');
        }

        $imported = 0;
        $skipped = 0;

        foreach ($rows as $row) {
            $attributeValues = [];
            $hasValue = false;

            foreach ($matchedAttributes as $attributeName => $header) {
                $value = trim((string) ($row[$header] ?? ''));
                $attributeValues[$attributeName] = $value;
                $hasValue = $hasValue || $value !== '';
            }

            if (!$hasValue) {
                $skipped++;
                continue;
            }

            $job = new Job();
            $job->campaignId = $campaignId;
            $job->jobTypeId = $jobTypeId;
            $job->attributeValues = $attributeValues;

            $this->repo()->create($job);

            $inserted = $this->repo()->findLatestByCampaignAndType($campaignId, $jobTypeId);
            if ($inserted !== null) {
                $this->auditRepo()->log(
                    (int) $inserted['id'],
                    'I',
                    $this->toAuditFields($inserted),
                    $this->currentUsername()
                );
            }

            $imported++;
        }

        return [
            'imported' => $imported,
            'skipped' => $skipped,
            'matched_attributes' => array_keys($matchedAttributes),
        ];
    }

    private function normalizeImportHeader(string $value): string
    {
        $value = strtolower(trim($value));
        $value = preg_replace('/[^a-z0-9]+/', ' ', $value) ?? '';

        return trim(preg_replace('/\s+/', ' ', $value) ?? '');
    }

    private function googleSheets(): GoogleSheetImportService
    {
        return new GoogleSheetImportService();
    }

    private function fileImport(): FileImportService
    {
        return new FileImportService();
    }

    // ── File upload import ────────────────────────────────────────────────────

    public function fileSheetsList(string $campaignId): Response
    {
        if ($this->campaignRepo()->find((int) $campaignId) === null) {
            return Response::json(['error' => 'Campaign not found.'], 404);
        }

        $request = Request::capture();
        if (!verify_csrf_token((string) $request->input('_token', ''))) {
            return Response::json(['error' => 'Your form session expired. Please refresh and try again.'], 419);
        }

        $upload = $_FILES['import_file'] ?? null;
        if ($upload === null || ($upload['error'] ?? UPLOAD_ERR_NO_FILE) === UPLOAD_ERR_NO_FILE) {
            return Response::json(['error' => 'No file was uploaded.'], 422);
        }

        try {
            $service  = $this->fileImport();
            $filename = $service->store($upload);
            $sheets   = $service->sheets($filename);

            return Response::json(['temp_file' => $filename, 'sheets' => $sheets]);
        } catch (\Throwable $e) {
            return Response::json(['error' => $e->getMessage()], 422);
        }
    }

    public function importFile(string $campaignId): Response
    {
        if ($this->campaignRepo()->find((int) $campaignId) === null) {
            return Response::json(['error' => 'Campaign not found.'], 404);
        }

        $request = Request::capture();
        if (!verify_csrf_token((string) $request->input('_token', ''))) {
            return Response::json(['error' => 'Your form session expired. Please refresh and try again.'], 419);
        }

        $tempFile  = basename(trim((string) $request->input('temp_file', '')));
        $gid       = trim((string) $request->input('sheet_gid', '0'));
        $jobTypeId = (int) $request->input('job_type_id', 0);
        $jobType   = $this->jtRepo()->find($jobTypeId);

        if ($tempFile === '' || $jobType === null) {
            return Response::json(['error' => 'Select a file, sheet, and job type.'], 422);
        }

        try {
            $service    = $this->fileImport();
            $sheet      = $service->rows($tempFile, $gid);
            $attributes = json_decode((string) ($jobType['attributes'] ?? '[]'), true) ?? [];

            $result = $this->importRows(
                (int) $campaignId,
                $jobTypeId,
                $attributes,
                $sheet['headers'],
                $sheet['rows']
            );

            $service->delete($tempFile);

            return Response::json($result);
        } catch (\Throwable $e) {
            return Response::json(['error' => $e->getMessage()], 422);
        }
    }

    /**
     * @param  list<array<string, mixed>> $rows
     * @return list<array<string, mixed>>
     */
    private function formatJobRows(array $rows): array
    {
        return array_map(static function (array $row): array {
            $attrValues = !empty($row['attribute_values'])
                ? (json_decode((string) $row['attribute_values'], true) ?? [])
                : [];
            $jobTypeAttributes = !empty($row['job_type_attributes'])
                ? (json_decode((string) $row['job_type_attributes'], true) ?? [])
                : [];

            $summary = implode(', ', array_map(
                static fn($k, $v) => "{$k}: {$v}",
                array_keys($attrValues),
                array_values($attrValues)
            ));

            return [
                'id'                 => (int)    $row['id'],
                'campaign_id'        => (int)    $row['campaign_id'],
                'campaign_type_name' => (string) $row['campaign_type_name'],
                'job_type_id'        => (int)    $row['job_type_id'],
                'job_type_name'      => (string) $row['job_type_name'],
                'job_type_attributes' => $jobTypeAttributes,
                'attribute_values'    => $attrValues,
                'attributes_summary' => $summary,
                'created_at'         => (string) $row['created_at'],
                'updated_at'         => (string) ($row['updated_at'] ?? ''),
            ];
        }, $rows);
    }

    private function validateForm(Request $request, array $jobTypes): array
    {
        $campaignId      = (int) $request->input('campaign_id', 0);
        $jobTypeId       = (int) $request->input('job_type_id', 0);
        $submittedValues = (array) ($request->input('attribute_values') ?? []);
        $errors          = [];

        if (!verify_csrf_token((string) $request->input('_token', ''))) {
            $errors['_token'][] = 'Your form session expired. Please refresh and try again.';
        }

        if ($campaignId === 0) {
            $errors['campaign_id'][] = 'Please select a campaign.';
        }

        if ($jobTypeId === 0) {
            $errors['job_type_id'][] = 'Please select a job type.';
        }

        $typeAttributes  = $this->attributesForType($jobTypeId, $jobTypes);
        $attributeValues = [];
        foreach ($typeAttributes as $attr) {
            $attributeValues[$attr['name']] = trim((string) ($submittedValues[$attr['name']] ?? ''));
        }

        return [
            ['campaign_id' => $campaignId, 'job_type_id' => $jobTypeId, 'attribute_values' => $attributeValues],
            $errors,
        ];
    }

    private function toAuditFields(array $row): array
    {
        $attrValues = [];
        if (!empty($row['attribute_values'])) {
            $raw        = $row['attribute_values'];
            $attrValues = is_string($raw) ? (json_decode($raw, true) ?? []) : (array) $raw;
        }

        return [
            'campaign_id'        => (int)    ($row['campaign_id']        ?? 0),
            'campaign_type_name' => (string) ($row['campaign_type_name'] ?? ''),
            'job_type_id'        => (int)    ($row['job_type_id']        ?? 0),
            'job_type_name'      => (string) ($row['job_type_name']      ?? ''),
            'attribute_values'   => $attrValues,
            'created_at'         => (string) ($row['created_at']         ?? ''),
            'updated_at'         => (string) ($row['updated_at']         ?? ''),
        ];
    }

    private function currentUsername(): string
    {
        return auth()->user()?->username ?? 'system';
    }

    private function repo(): JobRepository
    {
        return new JobRepository(database());
    }

    private function auditRepo(): JobAuditRepository
    {
        return new JobAuditRepository(database());
    }

    private function campaignRepo(): CampaignRepository
    {
        return new CampaignRepository(database());
    }

    private function jtRepo(): JobTypeRepository
    {
        return new JobTypeRepository(database());
    }
}