/*
|--------------------------------------------------------------------------
| Agência PSI
|--------------------------------------------------------------------------
| Arquivo: src/composables/useContactEmails.js
| Data: 2026-04-21
|
| Gerenciamento polimórfico de emails (patients, medicos, etc).
|--------------------------------------------------------------------------
*/

import { ref } from 'vue';
import { supabase } from '@/lib/supabase/client';
import { tenantDb } from '@/lib/supabase/tenantClient';
import { useTenantStore } from '@/stores/tenantStore';

const EMAIL_RE = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$/i;

function normalizeEmail(raw) {
    return String(raw || '').trim().toLowerCase();
}

// Mesma estratégia do useContactPhones: emails sem entidade ficam em
// memória com id 'pending_*' até flushPending gravar tudo em lote.
const PENDING_PREFIX = 'pending_';
function isPending(id) { return typeof id === 'string' && id.startsWith(PENDING_PREFIX); }
function genPendingId() {
    return `${PENDING_PREFIX}${Date.now()}_${Math.random().toString(36).slice(2, 10)}`;
}

export function useContactEmails() {
    const tenantStore = useTenantStore();

    const types = ref([]);
    const emails = ref([]);
    const loading = ref(false);
    const saving = ref(false);

    async function loadTypes() {
        try {
            const { data } = await tenantDb().from('contact_email_types')
                .select('id, name, slug, icon, is_system, position')
                .order('position', { ascending: true })
                .order('name', { ascending: true });
            types.value = data || [];
        } catch (e) {
            console.error('[useContactEmails] loadTypes:', e?.message);
            types.value = [];
        }
    }

    async function loadEmails(entityType, entityId) {
        if (!entityType || !entityId) {
            emails.value = [];
            return;
        }
        loading.value = true;
        try {
            const { data, error } = await tenantDb().from('contact_emails')
                .select('id, contact_email_type_id, email, is_primary, notes, position, created_at')
                .eq('entity_type', entityType)
                .eq('entity_id', entityId)
                .order('is_primary', { ascending: false })
                .order('position', { ascending: true });
            if (error) throw error;
            emails.value = data || [];
        } catch (e) {
            console.error('[useContactEmails] loadEmails:', e?.message);
            emails.value = [];
        } finally {
            loading.value = false;
        }
    }

    async function unsetOtherPrimaries(entityType, entityId, exceptId = null) {
        const q = tenantDb().from('contact_emails')
            .update({ is_primary: false })
            .eq('entity_type', entityType)
            .eq('entity_id', entityId)
            .eq('is_primary', true);
        if (exceptId) q.neq('id', exceptId);
        await q;
    }

    async function addEmail(entityType, entityId, { contact_email_type_id, email, is_primary = false, notes = null }) {
        const clean = normalizeEmail(email);
        if (!contact_email_type_id) return { ok: false, error: 'Tipo obrigatório' };
        if (!clean || !EMAIL_RE.test(clean)) return { ok: false, error: 'Email inválido' };

        // Modo pendente: entidade ainda não existe — mantém em memória até flushPending.
        if (!entityType || !entityId) {
            const wasFirst = emails.value.length === 0;
            if (is_primary || wasFirst) {
                emails.value.forEach((e) => { e.is_primary = false; });
                is_primary = true;
            }
            const maxPos = emails.value.reduce((m, e) => Math.max(m, e.position || 0), 0);
            const tempEmail = {
                id: genPendingId(),
                contact_email_type_id,
                email: clean,
                is_primary,
                notes,
                position: maxPos + 10,
                created_at: new Date().toISOString()
            };
            emails.value = [...emails.value, tempEmail];
            return { ok: true, email: tempEmail };
        }

        const tenantId = tenantStore.activeTenantId;
        if (!tenantId) return { ok: false, error: 'invalid_context' };

        saving.value = true;
        try {
            if (is_primary) {
                await unsetOtherPrimaries(entityType, entityId);
            } else if (emails.value.length === 0) {
                is_primary = true;
            }

            const maxPos = emails.value.reduce((m, e) => Math.max(m, e.position || 0), 0);
            const { data, error } = await tenantDb().from('contact_emails')
                .insert({
                    entity_type: entityType,
                    entity_id: entityId,
                    contact_email_type_id,
                    email: clean,
                    is_primary,
                    notes,
                    position: maxPos + 10
                })
                .select()
                .single();
            if (error) throw error;
            await loadEmails(entityType, entityId);
            return { ok: true, email: data };
        } catch (e) {
            return { ok: false, error: e?.message || 'add_failed' };
        } finally {
            saving.value = false;
        }
    }

    async function updateEmail(entityType, entityId, id, patch) {
        const sanitized = { ...patch };
        if (sanitized.email !== undefined) {
            sanitized.email = normalizeEmail(sanitized.email);
            if (!sanitized.email || !EMAIL_RE.test(sanitized.email)) {
                return { ok: false, error: 'Email inválido' };
            }
        }

        // Pending: muta no array local, sem DB
        if (isPending(id) || !entityType || !entityId) {
            const idx = emails.value.findIndex((e) => e.id === id);
            if (idx === -1) return { ok: false, error: 'not_found' };
            if (sanitized.is_primary === true) {
                emails.value.forEach((e, i) => { if (i !== idx) e.is_primary = false; });
            }
            emails.value[idx] = { ...emails.value[idx], ...sanitized };
            emails.value = [...emails.value];
            return { ok: true };
        }

        saving.value = true;
        try {
            if (sanitized.is_primary === true) {
                await unsetOtherPrimaries(entityType, entityId, id);
            }
            const { error } = await tenantDb().from('contact_emails').update(sanitized).eq('id', id);
            if (error) throw error;
            await loadEmails(entityType, entityId);
            return { ok: true };
        } catch (e) {
            return { ok: false, error: e?.message || 'update_failed' };
        } finally {
            saving.value = false;
        }
    }

    async function removeEmail(entityType, entityId, id) {
        // Pending: tira do array + promove próximo a primary se necessário
        if (isPending(id) || !entityType || !entityId) {
            const wasPrimary = emails.value.find((e) => e.id === id)?.is_primary;
            emails.value = emails.value.filter((e) => e.id !== id);
            if (wasPrimary && emails.value.length > 0) {
                const remaining = [...emails.value].sort((a, b) => (a.position || 0) - (b.position || 0));
                emails.value = emails.value.map((e) =>
                    e.id === remaining[0].id ? { ...e, is_primary: true } : e
                );
            }
            return { ok: true };
        }

        saving.value = true;
        try {
            const wasPrimary = emails.value.find((e) => e.id === id)?.is_primary;
            const { error } = await tenantDb().from('contact_emails').delete().eq('id', id);
            if (error) throw error;
            if (wasPrimary) {
                const remaining = emails.value.filter((e) => e.id !== id).sort((a, b) => (a.position || 0) - (b.position || 0));
                if (remaining.length > 0) {
                    await tenantDb().from('contact_emails').update({ is_primary: true }).eq('id', remaining[0].id);
                }
            }
            await loadEmails(entityType, entityId);
            return { ok: true };
        } catch (e) {
            return { ok: false, error: e?.message || 'remove_failed' };
        } finally {
            saving.value = false;
        }
    }

    // Grava em lote os emails que estavam em modo pendente.
    async function flushPending(entityType, entityId) {
        if (!entityType || !entityId) return { ok: false, error: 'missing_entity' };
        const tenantId = tenantStore.activeTenantId;
        if (!tenantId) return { ok: false, error: 'invalid_context' };
        const pendingItems = emails.value.filter((e) => isPending(e.id));
        if (pendingItems.length === 0) return { ok: true, count: 0 };
        saving.value = true;
        try {
            const rows = pendingItems.map((e) => ({
                entity_type: entityType,
                entity_id: entityId,
                contact_email_type_id: e.contact_email_type_id,
                email: normalizeEmail(e.email),
                is_primary: !!e.is_primary,
                notes: e.notes || null,
                position: e.position
            }));
            const { error } = await tenantDb().from('contact_emails').insert(rows);
            if (error) throw error;
            await loadEmails(entityType, entityId);
            return { ok: true, count: rows.length };
        } catch (e) {
            return { ok: false, error: e?.message || 'flush_failed' };
        } finally {
            saving.value = false;
        }
    }

    async function setPrimary(entityType, entityId, id) {
        return updateEmail(entityType, entityId, id, { is_primary: true });
    }

    function typeBySlug(slug) { return types.value.find((t) => t.slug === slug); }
    function typeById(id) { return types.value.find((t) => t.id === id); }

    return {
        types,
        emails,
        loading,
        saving,
        loadTypes,
        loadEmails,
        addEmail,
        updateEmail,
        removeEmail,
        setPrimary,
        flushPending,
        typeBySlug,
        typeById
    };
}