<?php

namespace App\Http\Controllers;

use App\Enums\PostStatus;
use App\Http\Requests\StorePostRequest;
use App\Http\Requests\UpdatePostRequest;
use App\Jobs\PublishPost;
use App\Models\Post;
use Carbon\Carbon;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Inertia\Inertia;
use Inertia\Response;

class PostController extends Controller
{
    public function index(Request $request): Response|RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        $posts = $workspace->posts()
            ->with(['postPlatforms.socialAccount', 'user'])
            ->latest('scheduled_at')
            ->paginate(20);

        return Inertia::render('posts/Index', [
            'workspace' => $workspace,
            'posts' => $posts,
        ]);
    }

    public function calendar(Request $request): Response|RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        $tz = $workspace->timezone;

        $weekStart = $request->input('week')
            ? Carbon::parse($request->input('week'), $tz)->startOfWeek()
            : Carbon::now($tz)->startOfWeek();

        $weekEnd = $weekStart->copy()->endOfWeek();

        // Convert to UTC for database query
        $weekStartUtc = $weekStart->copy()->utc();
        $weekEndUtc = $weekEnd->copy()->utc();

        $posts = $workspace->posts()
            ->with(['postPlatforms.socialAccount'])
            ->whereBetween('scheduled_at', [$weekStartUtc, $weekEndUtc])
            ->orderBy('scheduled_at')
            ->get()
            ->groupBy(fn ($post) => $post->scheduled_at?->setTimezone($tz)->format('Y-m-d'));

        return Inertia::render('posts/Calendar', [
            'workspace' => $workspace,
            'posts' => $posts,
            'currentWeekStart' => $weekStart->format('Y-m-d'),
        ]);
    }

    public function create(Request $request): RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        $socialAccounts = $workspace->socialAccounts;

        if ($socialAccounts->isEmpty()) {
            session()->flash('flash.banner', 'Connect at least one social network before creating a post.');
            session()->flash('flash.bannerStyle', 'danger');

            return redirect()->route('accounts');
        }

        // Create a draft post - default to today if no date provided
        $date = $request->input('date') ?: Carbon::now($workspace->timezone)->format('Y-m-d');
        $scheduledAt = Carbon::parse($date, $workspace->timezone)
            ->setTime(9, 0)
            ->utc();

        $post = $workspace->posts()->create([
            'user_id' => $request->user()->id,
            'status' => PostStatus::Draft,
            'scheduled_at' => $scheduledAt,
        ]);

        // Create post_platforms for each connected account
        foreach ($socialAccounts as $account) {
            $post->postPlatforms()->create([
                'social_account_id' => $account->id,
                'platform' => $account->platform->value,
                'content' => '',
                'status' => 'pending',
            ]);
        }

        return redirect()->route('posts.edit', $post);
    }

    public function store(StorePostRequest $request): RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        $post = $workspace->posts()->create([
            'user_id' => $request->user()->id,
            'status' => $request->input('status', PostStatus::Draft),
            'scheduled_at' => $request->input('scheduled_at'),
        ]);

        foreach ($request->input('platforms', []) as $platformData) {
            $postPlatform = $post->postPlatforms()->create([
                'social_account_id' => $platformData['social_account_id'],
                'platform' => $platformData['platform'],
                'content' => $platformData['content'],
                'status' => 'pending',
            ]);

            if (! empty($platformData['media_ids'])) {
                $postPlatform->media()->whereIn('id', $platformData['media_ids'])->update([
                    'post_platform_id' => $postPlatform->id,
                ]);
            }
        }

        $route = $request->input('status') === PostStatus::Scheduled->value
            ? 'calendar'
            : 'posts.index';

        session()->flash('flash.banner', 'Post created successfully!');
        session()->flash('flash.bannerStyle', 'success');

        return redirect()->route($route);
    }

    public function show(Request $request, Post $post): Response|RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        if ($post->workspace_id !== $workspace->id) {
            abort(404);
        }

        $post->load(['postPlatforms.socialAccount', 'postPlatforms.media', 'user']);

        return Inertia::render('posts/Show', [
            'workspace' => $workspace,
            'post' => $post,
        ]);
    }

    public function edit(Request $request, Post $post): Response|RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        if ($post->workspace_id !== $workspace->id) {
            abort(404);
        }

        if ($post->status === PostStatus::Published) {
            session()->flash('flash.banner', 'Published posts cannot be edited.');
            session()->flash('flash.bannerStyle', 'danger');

            return redirect()->route('posts.show', $post);
        }

        $post->load(['postPlatforms.socialAccount', 'postPlatforms.media']);
        $socialAccounts = $workspace->socialAccounts;

        $platformConfigs = $socialAccounts->mapWithKeys(function ($account) {
            $platform = $account->platform;

            return [
                $account->id => [
                    'maxContentLength' => $platform->maxContentLength(),
                    'maxImages' => $platform->maxImages(),
                    'allowedMediaTypes' => array_map(fn ($type) => $type->value, $platform->allowedMediaTypes()),
                    'supportsTextOnly' => $platform->supportsTextOnly(),
                ],
            ];
        });

        return Inertia::render('posts/Edit', [
            'workspace' => $workspace,
            'post' => $post,
            'socialAccounts' => $socialAccounts,
            'platformConfigs' => $platformConfigs,
        ]);
    }

    public function update(UpdatePostRequest $request, Post $post): RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        if ($post->workspace_id !== $workspace->id) {
            abort(404);
        }

        if ($post->status === PostStatus::Published) {
            session()->flash('flash.banner', 'Published posts cannot be edited.');
            session()->flash('flash.bannerStyle', 'danger');

            return back();
        }

        $scheduledAt = $post->scheduled_at;
        if ($request->has('scheduled_at') && $request->input('scheduled_at')) {
            $scheduledAt = Carbon::parse($request->input('scheduled_at'), $workspace->timezone)->utc();
        }

        $status = $request->input('status', $post->status);

        $post->update([
            'status' => $status === 'publishing' ? PostStatus::Publishing : $status,
            'scheduled_at' => $scheduledAt,
        ]);

        // Get selected platform IDs
        $selectedPlatformIds = collect($request->input('platforms', []))->pluck('id')->toArray();

        // Update all platforms - disable those not selected, update content for selected ones
        $post->postPlatforms()->update(['enabled' => false]);

        foreach ($request->input('platforms', []) as $platformData) {
            $post->postPlatforms()
                ->where('id', $platformData['id'])
                ->update([
                    'enabled' => true,
                    'content' => $platformData['content'],
                ]);
        }

        // Dispatch publish job if publishing now
        if ($status === 'publishing') {
            PublishPost::dispatch($post);

            session()->flash('flash.banner', 'Post is being published!');
            session()->flash('flash.bannerStyle', 'success');

            return redirect()->route('posts.show', $post);
        }

        session()->flash('flash.banner', 'Post updated successfully!');
        session()->flash('flash.bannerStyle', 'success');

        return redirect()->route('posts.show', $post);
    }

    public function destroy(Request $request, Post $post): RedirectResponse
    {
        $workspace = $request->user()->currentWorkspace;

        if (! $workspace) {
            return redirect()->route('workspaces.create');
        }

        $this->authorize('view', $workspace);

        if ($post->workspace_id !== $workspace->id) {
            abort(404);
        }

        $post->delete();

        session()->flash('flash.banner', 'Post deleted successfully!');
        session()->flash('flash.bannerStyle', 'success');

        return redirect()->route('calendar');
    }
}