#include <stdio.h>

#include "strops.hpp"
#include "ui.hpp"
#include "imgui.h"
#include "administration.hpp"
#include "locales.hpp"

static view_state current_view_state = view_state::LIST;
static contact selected_for_removal;

static contact active_contact;

void ui_setup_contacts()
{
    current_view_state = view_state::LIST;
    active_contact = active_contact = administration_create_empty_contact();
    memset(&selected_for_removal, 0, sizeof(contact));
}

bool draw_contact_form(contact* buffer, bool back_button_enabled = true, bool viewing_only = false)
{
    const char* selected_country = NULL;

    if (back_button_enabled)
    {
        if (ImGui::Button(localize("form.back"))) {
            current_view_state = view_state::LIST;
            selected_country = 0;
            return false;
        }
    }
    ImGui::Spacing();
    float widthAvailable = ImGui::GetContentRegionAvail().x;
    
    // 1. Identifier
    //ImGui::BeginDisabled();
    //ImGui::SetNextItemWidth(widthAvailable*0.2f);
    //ImGui::InputText(localize("contact.form.identifier"), buffer->id, IM_ARRAYSIZE(buffer->id));
    //if (!viewing_only) ImGui::EndDisabled();

    // 2. Full name
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.fullname"), localize("contact.form.fullname"), buffer->name, IM_ARRAYSIZE(buffer->name));
    ImGui::SameLine();ui_helper_draw_required_tag();

    // 3. Address line 1
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.address1"), localize("contact.form.address1"), buffer->address.address1, IM_ARRAYSIZE(buffer->address.address1));
    ImGui::SameLine();ui_helper_draw_required_tag();

    // 4. Address line 2
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.address2"), localize("contact.form.address2"), buffer->address.address2, IM_ARRAYSIZE(buffer->address.address2));
    ImGui::SameLine();ui_helper_draw_required_tag();

    // 5. Country dropdown.
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    const char* countries[] = { localize("country.AT"),localize("country.BE"),localize("country.BG"),localize("country.HR"),localize("country.CY"),localize("country.CZ"),localize("country.DK"),localize("country.EE"),localize("country.FI"),localize("country.FR"),localize("country.DE"),localize("country.GR"),localize("country.HU"),localize("country.IE"),localize("country.IT"),localize("country.LV"),localize("country.LT"),localize("country.LU"),localize("country.MT"),localize("country.NL"),localize("country.PL"),localize("country.PT"),localize("country.RO"),localize("country.SK"),localize("country.SI"),localize("country.ES"),localize("country.SE") };
    const char* country_codes[] = {
        "AT", "BE", "BG", "HR", "CY", "CZ", "DK", "EE", "FI", "FR",
        "DE", "GR", "HU", "IE", "IT", "LV", "LT", "LU", "MT", "NL",
        "PL", "PT", "RO", "SK", "SI", "ES", "SE"
    };
    s32 country_count = sizeof(countries) / sizeof(countries[0]);
    if (selected_country == 0) {
        for (int i = 0; i < country_count; i++)
        {
            if (strcmp(country_codes[i], buffer->address.country_code) == 0)
            {
                selected_country = countries[i];
                break;
            }
        }
    }

    int selected_country_index = -1;
    if (ImGui::BeginCombo(localize("contact.form.country"), selected_country))
    {
        for (int n = 0; n < IM_ARRAYSIZE(countries); n++)
        {
            bool is_selected = (selected_country == countries[n]);
            if (ImGui::Selectable(countries[n], is_selected)) {
                selected_country = countries[n];
                selected_country_index = n;
            }
        }
        ImGui::EndCombo();
    }
    if (selected_country_index != -1) {
        strops_copy(buffer->address.country_code, country_codes[selected_country_index], IM_ARRAYSIZE(buffer->address.country_code));
    }
    ImGui::SameLine();ui_helper_draw_required_tag();

    // 6. Contact type dropdown.
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    const char* customer_types[2] = { localize("contact.form.type.business"), localize("contact.form.type.consumer") };
    int currentItem = static_cast<int>(buffer->type);
    if (ImGui::Combo(localize("contact.form.type"), &currentItem, customer_types, IM_ARRAYSIZE(customer_types)))
    {
        buffer->type = static_cast<contact_type>(currentItem);
    }

    // Fields only required for businesses.
    if (buffer->type == contact_type::CONTACT_BUSINESS)
    {
        // 7. Tax number
        ImGui::SetNextItemWidth(widthAvailable*0.5f);
        ImGui::InputTextWithHint(localize("contact.form.taxnumber"), localize("contact.form.taxnumber"), buffer->taxid, IM_ARRAYSIZE(buffer->taxid));
        
        // 8. Business number / Chamber of commerce
        ImGui::SetNextItemWidth(widthAvailable*0.5f);
        ImGui::InputTextWithHint(localize("contact.form.businessnumber"), localize("contact.form.businessnumber"), buffer->businessid, IM_ARRAYSIZE(buffer->businessid));
    }

    // 9. Email
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.email"), localize("contact.form.email"), buffer->email, IM_ARRAYSIZE(buffer->email));
    
    // 10. Phone number
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.phonenumber"), localize("contact.form.phonenumber"), buffer->phone_number, IM_ARRAYSIZE(buffer->phone_number));
    
    // 11. Bank account.
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.bankaccount"), localize("contact.form.bankaccount"), buffer->bank_account, IM_ARRAYSIZE(buffer->bank_account));

    if (viewing_only) ImGui::EndDisabled();

    if (!viewing_only) {
        bool can_save = strlen(buffer->name) > 0 && strlen(buffer->address.address1) > 0 && 
            strlen(buffer->address.address2) > 0 && strlen(buffer->address.country_code) > 0;

        if (!can_save) ImGui::BeginDisabled();
        // Save button
        ImGui::Spacing();
        if (ImGui::Button(localize("form.save"))) {
            return true;
        }
        if (!can_save) ImGui::EndDisabled();
    }
    else {
        // TODO list invoices connected to contact.
    }
    return false;
}

static void draw_contact_list()
{
    const u32 items_per_page = 50;
    static s32 current_page = 0;
    s32 max_page = (administration_get_contact_count() + items_per_page - 1) / items_per_page;
    if (max_page == 0) max_page = 1;

    // Table header controls: create button and pagination.
    if (ImGui::Button(localize("form.create")))
    {
        current_view_state = view_state::CREATE;
        active_contact = administration_create_empty_contact();
    }

    if (current_page >= max_page-1) current_page = max_page-1;
    if (current_page < 0) current_page = 0;

    // Navigate to prev page button.
    ImGui::SameLine();
    bool enable_prev = current_page > 0;
    if (!enable_prev) ImGui::BeginDisabled();
    if (ImGui::Button("<< Prev") && current_page > 0) current_page--;
    if (!enable_prev) ImGui::EndDisabled();

    ImGui::SameLine();
    ImGui::Text("(%d/%d)", current_page+1, max_page);

    // Navigate to next page button.
    ImGui::SameLine();
    bool enable_next = current_page < max_page-1;
    if (!enable_next) ImGui::BeginDisabled();
    if (ImGui::Button("Next >>") && current_page < max_page-1) current_page++;
    if (!enable_next) ImGui::EndDisabled();

    ImGui::Spacing();

    if (ImGui::BeginTable("TableContacts", 4, ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg)) {

        ImGui::TableSetupColumn(localize("contact.table.identifier"), ImGuiTableColumnFlags_WidthFixed, 80);
        ImGui::TableSetupColumn(localize("contact.table.name"), ImGuiTableColumnFlags_WidthStretch);
        ImGui::TableSetupColumn(localize("contact.table.address"), ImGuiTableColumnFlags_WidthStretch);
        ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthFixed, 160);
        ImGui::TableHeadersRow();

        contact contact_list[items_per_page];
        u32 contact_count = administration_get_contacts(current_page, items_per_page, contact_list);

        for (u32 i = 0; i < contact_count; i++) {
            contact c = contact_list[i];
            
            ImGui::TableNextRow();
            ImGui::TableSetColumnIndex(0); ImGui::Text(c.id);
            ImGui::TableSetColumnIndex(1); ImGui::Text(c.name);
            ImGui::TableSetColumnIndex(2); ImGui::Text("%s %s", c.address.address1, c.address.address2);

            ImGui::TableSetColumnIndex(3);
            
            char btn_name[20];
            snprintf(btn_name, sizeof(btn_name), "%s##%d", localize("form.view"), i);
            if (ImGui::Button(btn_name)) {
                active_contact = c;
                current_view_state = view_state::VIEW;
            }

            ImGui::SameLine();

            snprintf(btn_name, sizeof(btn_name), "%s##%d", localize("form.change"), i);
            if (ImGui::Button(btn_name)) {
                active_contact = c;
                current_view_state = view_state::EDIT;
            }

            ImGui::SameLine();
            if (administration_can_contact_be_deleted(c))
            {
                snprintf(btn_name, sizeof(btn_name), "%s##%d", localize("form.delete"), i);
                if (ImGui::Button(btn_name)) {
                    selected_for_removal = c;
                    ImGui::OpenPopup("ConfirmDeletePopup");
                }
            }
        }

        // Confirmation popup before contact is deleted definitively.
        if (ImGui::BeginPopupModal("ConfirmDeletePopup", nullptr, ImGuiWindowFlags_AlwaysAutoResize|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoTitleBar)) {
            ImGui::Text(localize("form.confirmDelete"));
            ImGui::Separator();

            if (ImGui::Button(localize("form.yes"), ImVec2(120, 0))) { 
                administration_remove_contact(selected_for_removal);
                ImGui::CloseCurrentPopup();
            }
            ImGui::SameLine();
            if (ImGui::Button(localize("form.no"), ImVec2(120, 0))) {
                ImGui::CloseCurrentPopup();
            }
            ImGui::EndPopup();
        }

        ImGui::EndTable();
    }
}

void ui_draw_contacts()
{
    switch(current_view_state)
    {
        case view_state::LIST: draw_contact_list(); break;
        case view_state::CREATE: 
            if (draw_contact_form(&active_contact)) 
            {
                administration_create_contact(active_contact);
                current_view_state = view_state::LIST;
            } 
            break;
        case view_state::EDIT: 
        if (draw_contact_form(&active_contact)) 
        {
            administration_update_contact(active_contact);
            current_view_state = view_state::LIST;
        } 
        break;
        case view_state::VIEW: draw_contact_form(&active_contact, true, true); break;
    }
}