const express = require('express');
const router = express.Router();
const { requireAuth } = require('../middlewares/authMiddleware');
const { createFormMock } = require('../utils/formHelper');

router.use(requireAuth);

// Fallback data si la API estuviera inaccesible (con capacidad física real)
const defaultBuildings = [
    {
        id: 1,
        code: 'CENTRAL',
        name: 'Edificio Central',
        is_active: true,
        is_virtual: false,
        address: 'Tte. Gral. Juan Domingo Perón 802, CABA',
        description: 'Sede central institucional de UniCABA. Aulas de grado, auditorio y laboratorios.',
        floors: 4,
        classrooms_count: 29,
        physical_capacity: 1250,
        total_capacity: 1250,
        capacity_display: '1250'
    },
    {
        id: 2,
        code: 'VIRTUAL',
        name: 'Campus Virtual',
        is_active: true,
        is_virtual: true,
        address: 'campus.unicaba.edu.ar / MS Teams & Moodle',
        description: 'Entorno de aprendizaje digital, aulas sincrónicas y videoconferencias.',
        floors: 0,
        classrooms_count: 2,
        physical_capacity: 0,
        total_capacity: 0,
        capacity_display: 'Ilimitada (Virtual)'
    }
];

// 1. List Buildings
const handleListBuildings = async (req, res) => {
    try {
        const { search = '', status = '' } = req.query;
        let buildings = [];
        let stats = {
            total_buildings: 2,
            total_classrooms: 31,
            physical_classrooms_count: 29,
            total_physical_capacity: 1250,
            total_floors: 4
        };

        try {
            const apiRes = await req.apiClient.get('/buildings', { params: { search, status } });
            if (apiRes.data && apiRes.data.buildings) {
                buildings = apiRes.data.buildings;
                if (apiRes.data.stats) {
                    stats = apiRes.data.stats;
                }
            }
        } catch (apiErr) {
            console.warn('API /buildings notice, using fallback:', apiErr.message);
            buildings = [...defaultBuildings];
        }

        // Si por alguna razón la lista vino vacía de la API y no había filtros de búsqueda, usar default
        if (buildings.length === 0 && !search && !status) {
            buildings = [...defaultBuildings];
        }

        // Asegurar campos calculados consistentes para cada edificio
        buildings = buildings.map(b => {
            const is_virtual = Boolean(b.is_virtual || (b.code && b.code.toUpperCase() === 'VIRTUAL') || (b.name && b.name.toUpperCase().includes('VIRTUAL')));
            return {
                ...b,
                is_virtual,
                capacity_display: is_virtual ? 'Ilimitada (Virtual)' : String(b.physical_capacity !== undefined ? b.physical_capacity : (b.total_capacity || 0)),
                total_capacity: is_virtual ? 0 : (b.physical_capacity !== undefined ? b.physical_capacity : (b.total_capacity || 0)),
                floors_display: is_virtual ? 'Digital' : String(b.floors ?? 1)
            };
        });

        // Capacidad física total: suma exclusiva de sedes presenciales (nunca suma 9999)
        const total_physical_capacity = stats.total_physical_capacity || buildings
            .filter(b => !b.is_virtual)
            .reduce((acc, b) => acc + (b.physical_capacity || b.total_capacity || 0), 0);

        res.render('buildings/list', {
            title: 'Gestión de Edificios - Edu-Space Admin',
            buildings,
            total_classrooms: stats.total_classrooms || buildings.reduce((a, b) => a + (b.classrooms_count || 0), 0),
            total_capacity: total_physical_capacity,
            total_physical_capacity,
            search,
            status_filter: status
        });
    } catch (error) {
        console.error('Error rendering buildings list:', error.message);
        res.render('buildings/list', {
            title: 'Gestión de Edificios - Edu-Space Admin',
            buildings: defaultBuildings,
            total_classrooms: 31,
            total_capacity: 1250,
            total_physical_capacity: 1250,
            search: '',
            status_filter: ''
        });
    }
};

router.get(['/', '/list', '/list_buildings'], handleListBuildings);

// 2. Add Building (GET & POST)
router.get(['/add', '/add_building'], (req, res) => {
    const form = createFormMock({
        name: '',
        code: '',
        address: '',
        floors: 1,
        description: '',
        is_active: true
    });
    res.render('buildings/form', {
        title: 'Nuevo Edificio - Edu-Space Admin',
        building: null,
        form
    });
});

router.post(['/add', '/add_building'], async (req, res) => {
    try {
        const { name, code, address, floors, description, is_active } = req.body;
        const payload = {
            name: (name || '').trim(),
            code: (code || '').trim().toUpperCase() || null,
            address: (address || '').trim() || null,
            floors: parseInt(floors, 10) || 1,
            description: (description || '').trim() || null,
            is_active: is_active === 'true' || is_active === 'on' || is_active === true || is_active === '1'
        };
        await req.apiClient.post('/buildings', payload);
        res.redirect('/buildings/list_buildings?created=1');
    } catch (err) {
        console.warn('Error creating building:', err.response?.data || err.message);
        res.redirect('/buildings/list_buildings?error=create');
    }
});

// 3. View Building
router.get(['/view/:id', '/view_building', '/:id'], async (req, res) => {
    const id = parseInt(req.params.id || req.query.id, 10) || 1;
    let building = null;
    let classrooms = [];

    try {
        const apiRes = await req.apiClient.get(`/buildings/${id}`);
        if (apiRes.data && apiRes.data.building) {
            building = apiRes.data.building;
            classrooms = apiRes.data.classrooms || [];
        }
    } catch (e) {
        building = defaultBuildings.find(b => b.id === id) || defaultBuildings[0];
    }

    if (!building) {
        return res.redirect('/buildings/list_buildings');
    }

    const is_virtual = Boolean(building.is_virtual || (building.code && building.code.toUpperCase() === 'VIRTUAL') || (building.name && building.name.toUpperCase().includes('VIRTUAL')));
    building = {
        ...building,
        is_virtual,
        capacity_display: is_virtual ? 'Ilimitada (Virtual)' : String(building.physical_capacity || building.total_capacity || 0),
        floors_display: is_virtual ? 'Digital' : String(building.floors ?? 1)
    };

    res.render('buildings/view', {
        title: `Edificio ${building.name} - Edu-Space Admin`,
        building,
        classrooms
    });
});

// 4. Edit Building (GET)
const handleEditBuildingGet = async (req, res) => {
    const id = parseInt(req.params.id || req.query.id, 10) || 1;
    let building = null;

    try {
        const apiRes = await req.apiClient.get(`/buildings/${id}`);
        if (apiRes.data && apiRes.data.building) {
            building = apiRes.data.building;
        }
    } catch (e) {
        building = defaultBuildings.find(b => b.id === id) || defaultBuildings[0];
    }

    if (!building) {
        return res.redirect('/buildings/list_buildings');
    }

    const form = createFormMock({
        name: building.name,
        code: building.code,
        address: building.address,
        floors: building.floors,
        description: building.description,
        is_active: building.is_active
    });

    res.render('buildings/form', {
        title: `Editar Edificio - ${building.name}`,
        building,
        form
    });
};

router.get(['/edit/:id', '/:id/edit', '/edit_building'], handleEditBuildingGet);

// 5. Edit Building (POST)
const handleEditBuildingPost = async (req, res) => {
    const id = parseInt(req.params.id || req.query.id || req.body.id, 10) || 1;
    const { name, code, address, floors, description, is_active } = req.body;

    try {
        const payload = {
            name: (name || '').trim(),
            code: (code || '').trim().toUpperCase() || null,
            address: (address || '').trim() || null,
            floors: parseInt(floors, 10) || 0,
            description: (description || '').trim() || null,
            is_active: is_active === 'true' || is_active === 'on' || is_active === true || is_active === '1'
        };

        await req.apiClient.put(`/buildings/${id}`, payload);
        res.redirect('/buildings/list_buildings?updated=1');
    } catch (err) {
        console.warn('Error updating building:', err.response?.data || err.message);
        res.redirect('/buildings/list_buildings?error=update');
    }
};

router.post(['/edit/:id', '/:id/edit', '/edit_building'], handleEditBuildingPost);

// 6. Toggle Building
router.post(['/toggle/:id', '/:id/toggle', '/toggle_building'], async (req, res) => {
    const id = parseInt(req.params.id || req.query.id || req.body.id, 10) || 1;
    try {
        await req.apiClient.post(`/buildings/${id}/toggle`);
    } catch (e) {
        console.warn('Error toggling building:', e.message);
    }
    res.redirect('/buildings/list_buildings');
});

// 7. Delete Building
router.post(['/delete/:id', '/:id/delete', '/delete_building'], async (req, res) => {
    const id = parseInt(req.params.id || req.query.id || req.body.id, 10);
    try {
        await req.apiClient.delete(`/buildings/${id}`);
    } catch (e) {
        console.warn('Error deleting building:', e.message);
    }
    res.redirect('/buildings/list_buildings');
});

module.exports = router;