<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Api\Concerns\ResolvesParticipantApplication;
use App\Http\Controllers\Controller;
use App\Models\Application;
use App\Models\Competition;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

class ApplicationController extends Controller
{
    use ResolvesParticipantApplication;

    private function ensureParticipantMayEditSignup(Application $app): void
    {
        $app->assertMayEditSignup('status');
    }

    private function currentApplication(Request $request): Application
    {
        return $this->participantApplication($request);
    }

    /**
     * @return list<string>
     */
    private function enabledTrackCodes(Competition $competition): array
    {
        return $competition->tracks()
            ->where('is_enabled', true)
            ->pluck('track_code')
            ->all();
    }

    /** 报名表 schema 是否包含参赛承诺书勾选（与选手端 key 一致） */
    private function signupSchemaRequiresCommitment(Competition $competition): bool
    {
        $competition->loadMissing('formSchema');
        $rows = $competition->formSchema?->schema_json;
        if (! is_array($rows) || count($rows) === 0) {
            return true;
        }
        foreach ($rows as $row) {
            if (is_array($row) && ($row['key'] ?? '') === 'commitment_accepted') {
                return true;
            }
        }

        return false;
    }

    public function show(Request $request): JsonResponse
    {
        $app = $this->currentApplication($request);
        $app->load(['files']);

        return response()->json($this->transform($app));
    }

    public function update(Request $request): JsonResponse
    {
        $competition = $this->resolvePublishedCompetitionFromRequest($request);
        $app = $this->currentApplication($request);

        $this->ensureParticipantMayEditSignup($app);

        $trackCodes = $this->enabledTrackCodes($competition);
        $degrees = config('contest.degrees', []);
        $countries = config('contest.location_countries', []);

        $trackRules = count($trackCodes)
            ? ['nullable', 'string', Rule::in($trackCodes)]
            : ['nullable', 'string', 'max:100'];

        $rules = [
            'player_name' => ['nullable', 'string', 'max:120'],
            'school' => ['nullable', 'string', 'max:200'],
            'degree' => ['nullable', 'string', Rule::in($degrees)],
            'contact_email' => ['nullable', 'email', 'max:255'],
            'contact_mobile' => ['nullable', 'regex:/^1[3-9]\d{9}$/'],
            'company_name' => ['nullable', 'string', 'max:255'],
            'project_name' => ['nullable', 'string', 'max:255'],
            'track' => $trackRules,
            'location_country' => ['nullable', 'string', Rule::in($countries)],
            'location_province' => ['nullable', 'string', 'max:100'],
            'location_city' => ['nullable', 'string', 'max:100'],
            'oversea_country' => ['nullable', 'string', 'max:100'],
            'intro' => ['nullable', 'string', 'max:5000'],
        ];
        if ($this->signupSchemaRequiresCommitment($competition)) {
            $rules['commitment_accepted'] = ['sometimes', 'boolean'];
            $rules['promise_signature'] = ['nullable', 'string', 'max:2097152'];
        }

        $data = $request->validate($rules);

        $commitmentAccepted = $data['commitment_accepted'] ?? null;
        $promiseSignature = $data['promise_signature'] ?? null;
        unset($data['commitment_accepted'], $data['promise_signature']);

        $app->fill($data);

        if ($this->signupSchemaRequiresCommitment($competition)) {
            if ($commitmentAccepted === true) {
                if (! is_string($promiseSignature) || trim($promiseSignature) === '') {
                    throw ValidationException::withMessages([
                        'promise_signature' => ['请完成手写签名后再保存'],
                    ]);
                }
                $app->promise_signed_at = now();
                $app->promise_signature = $promiseSignature;
            } elseif ($commitmentAccepted === false) {
                $app->promise_signed_at = null;
                $app->promise_signature = null;
            }
        }

        if (! empty($data['player_name']) && empty($request->user()->name)) {
            $request->user()->update(['name' => $data['player_name']]);
        }

        if (! empty($data['contact_email']) && empty($request->user()->email)) {
            $request->user()->update(['email' => $data['contact_email']]);
        }

        $app->save();

        $app->load(['files']);

        return response()->json($this->transform($app));
    }

    public function submit(Request $request): JsonResponse
    {
        $competition = $this->resolvePublishedCompetitionFromRequest($request);
        $app = $this->currentApplication($request);

        $this->ensureParticipantMayEditSignup($app);

        $trackCodes = $this->enabledTrackCodes($competition);
        if (count($trackCodes) === 0) {
            throw ValidationException::withMessages([
                'track' => ['本场赛事尚未配置可用赛道，请联系管理员'],
            ]);
        }

        $degrees = config('contest.degrees', []);
        $countries = config('contest.location_countries', []);

        $rules = [
            'player_name' => ['required', 'string', 'max:120'],
            'school' => ['required', 'string', 'max:200'],
            'degree' => ['required', 'string', Rule::in($degrees)],
            'contact_email' => ['required', 'email', 'max:255'],
            'contact_mobile' => ['required', 'regex:/^1[3-9]\d{9}$/'],
            'company_name' => ['nullable', 'string', 'max:255'],
            'project_name' => ['required', 'string', 'max:255'],
            'track' => ['required', 'string', Rule::in($trackCodes)],
            'location_country' => ['required', 'string', Rule::in($countries)],
            'location_province' => ['nullable', 'string', 'max:100', 'required_if:location_country,中国'],
            'location_city' => ['nullable', 'string', 'max:100', 'required_if:location_country,中国'],
            'oversea_country' => ['nullable', 'string', 'max:100', 'required_if:location_country,海外'],
            'intro' => ['nullable', 'string', 'max:5000'],
        ];
        if ($this->signupSchemaRequiresCommitment($competition)) {
            $rules['commitment_accepted'] = ['required', 'accepted'];
            $rules['promise_signature'] = ['required', 'string', 'max:2097152'];
        }

        $data = $request->validate($rules);

        $promiseSignature = $data['promise_signature'] ?? '';
        unset($data['commitment_accepted'], $data['promise_signature']);

        $planCount = $app->files()->where('kind', 'plan')->count();
        if ($planCount < 1) {
            throw ValidationException::withMessages([
                'files' => ['请至少上传一份商业计划书'],
            ]);
        }

        $app->fill($data);
        if ($this->signupSchemaRequiresCommitment($competition)) {
            if (! is_string($promiseSignature) || trim($promiseSignature) === '') {
                throw ValidationException::withMessages([
                    'promise_signature' => ['请完成参赛承诺书手写签名'],
                ]);
            }
            $app->promise_signature = $promiseSignature;
            $app->promise_signed_at = now();
        }
        $app->status = 'submitted';
        $app->submitted_at = now();
        $app->save();

        $request->user()->update([
            'name' => $data['player_name'],
            'email' => $data['contact_email'],
        ]);

        $app->load(['files']);

        return response()->json($this->transform($app));
    }

    private function transform(Application $app): array
    {
        return [
            'id' => $app->id,
            'competition_id' => $app->competition_id,
            'status' => $app->status,
            'player_name' => $app->player_name,
            'school' => $app->school,
            'degree' => $app->degree,
            'contact_email' => $app->contact_email,
            'contact_mobile' => $app->contact_mobile,
            'company_name' => $app->company_name,
            'project_name' => $app->project_name,
            'track' => $app->track,
            'location_country' => $app->location_country,
            'location_province' => $app->location_province,
            'location_city' => $app->location_city,
            'oversea_country' => $app->oversea_country,
            'intro' => $app->intro,
            'promise_signed_at' => $app->promise_signed_at?->toIso8601String(),
            'promise_signature' => $app->promise_signature,
            'submitted_at' => $app->submitted_at?->toIso8601String(),
            'participant_may_edit' => $app->participantMayEditSignup(),
            'files' => $app->files->map(fn ($f) => [
                'id' => $f->id,
                'kind' => $f->kind,
                'original_name' => $f->original_name,
                'size' => $f->size,
                'url' => $f->publicUrl(),
            ])->values(),
        ];
    }
}