#include <stdio.h>

#include "views.hpp"
#include "imgui.h"
#include "../administration.hpp"

typedef enum {
    VIEW,
    EDIT,
    CREATE,
    INSPECT,
} contact_view_state;

contact_view_state view_state = VIEW;
static int selected_for_removal = -1; // Index in contact list selected for removal.

static contact edit_contact;

static void draw_required_tag()
{
    ImDrawList* draw_list = ImGui::GetWindowDrawList();

    const char* text = localize("form.required");
    ImVec2 text_pos = ImGui::GetCursorScreenPos();
    ImVec2 text_size = ImGui::CalcTextSize(text);
    text_pos.y += text_size.y/4.0f;

    ImVec4 bg_color = ImVec4(0.9f, 0.235f, 0.235f, 0.4f);  // Blue background
    ImVec4 text_color = ImVec4(1.0f, 1.0f, 1.0f, 1.0f); // White text
    float rounding = 2.0f;
    float padding = 2.0f;

    // Background rectangle
    ImVec2 bg_min = ImVec2(text_pos.x - padding, text_pos.y - padding);
    ImVec2 bg_max = ImVec2(text_pos.x + text_size.x + padding, text_pos.y + text_size.y + padding);
    draw_list->AddRectFilled(bg_min, bg_max, ImColor(bg_color), rounding);

    // Foreground text
    ImGui::PushStyleColor(ImGuiCol_Text, text_color);
    ImGui::TextUnformatted(text);
    ImGui::PopStyleColor();
}

static void show_edit_contact()
{
    if (ImGui::Button(localize("form.back"))) {
        view_state = contact_view_state::VIEW;
        memset(&edit_contact, 0, sizeof(contact));
    }
    ImGui::Spacing();

    // Input fields
    ImGui::BeginDisabled();

    float widthAvailable = ImGui::GetContentRegionAvail().x;
    
    ImGui::SetNextItemWidth(widthAvailable*0.2f);
    ImGui::InputText(localize("contact.form.identifier"), edit_contact.id, IM_ARRAYSIZE(edit_contact.id));
    ImGui::EndDisabled();

    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.fullname"), localize("contact.form.fullname"), edit_contact.name, IM_ARRAYSIZE(edit_contact.name));
    ImGui::SameLine();draw_required_tag();

    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.address1"), localize("contact.form.address1"), edit_contact.address1, IM_ARRAYSIZE(edit_contact.address1));
    ImGui::SameLine();draw_required_tag();

    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.address2"), localize("contact.form.address2"), edit_contact.address2, IM_ARRAYSIZE(edit_contact.address2));
    ImGui::SameLine();draw_required_tag();
    
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.taxnumber"), localize("contact.form.taxnumber"), edit_contact.taxid, IM_ARRAYSIZE(edit_contact.taxid));
    
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.businessnumber"), localize("contact.form.businessnumber"), edit_contact.businessid, IM_ARRAYSIZE(edit_contact.businessid));
    
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.email"), localize("contact.form.email"), edit_contact.email, IM_ARRAYSIZE(edit_contact.email));
    
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.phonenumber"), localize("contact.form.phonenumber"), edit_contact.phone_number, IM_ARRAYSIZE(edit_contact.phone_number));
    
    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("contact.form.bankaccount"), localize("contact.form.bankaccount"), edit_contact.bank_account, IM_ARRAYSIZE(edit_contact.bank_account));

    bool can_save = strlen(edit_contact.name) > 0 && strlen(edit_contact.address1) > 0 && strlen(edit_contact.address2) > 0;

    if (!can_save) ImGui::BeginDisabled();

    // Save button
    ImGui::Spacing();
    if (ImGui::Button(localize("form.save"))) {
        if (view_state == contact_view_state::CREATE)
            create_contact(edit_contact);

        else if (view_state == contact_view_state::EDIT)
            update_contact(edit_contact);

        memset(&edit_contact, 0, sizeof(contact));
        view_state = contact_view_state::VIEW;
    }

    if (!can_save) ImGui::EndDisabled();
}

void show_contacts()
{
    if (view_state == contact_view_state::CREATE || view_state == contact_view_state::EDIT) {
        show_edit_contact();
        return;
    }
    
    if (ImGui::Button(localize("form.create")))
    {
        view_state = contact_view_state::CREATE;
        memset(&edit_contact, 0, sizeof(contact));
        snprintf(edit_contact.id, IM_ARRAYSIZE(edit_contact.id), "C/%d", g_administration.next_id);
    }
    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, 120);
        ImGui::TableHeadersRow();

        list_iterator_start(&g_administration.contacts);
        while (list_iterator_hasnext(&g_administration.contacts)) {
            contact c = *(contact *)list_iterator_next(&g_administration.contacts);
            
            ImGui::TableNextRow();
            ImGui::TableSetColumnIndex(0); ImGui::Text(c.id);
            ImGui::TableSetColumnIndex(1); ImGui::Text(c.name);
            ImGui::TableSetColumnIndex(2); ImGui::Text("%s %s", c.address1, c.address2);

            ImGui::TableSetColumnIndex(3);
            
            char btn_name[20];
            sprintf(btn_name, "%s##%d", localize("form.change"), g_administration.contacts.iter_pos);
            if (ImGui::Button(btn_name)) {
                edit_contact = c;
                view_state = contact_view_state::EDIT;
            }

            ImGui::SameLine();

            // @TODO check to make sure no invoices are connected to this contact.
            sprintf(btn_name, "%s##%d", localize("form.delete"), g_administration.contacts.iter_pos);
            if (ImGui::Button(btn_name)) {
                selected_for_removal = g_administration.contacts.iter_pos;
                ImGui::OpenPopup("ConfirmDeletePopup");
            }
        }
        list_iterator_stop(&g_administration.contacts);      

        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))) { 
                remove_contact(selected_for_removal-1);
                ImGui::CloseCurrentPopup();
            }
            ImGui::SameLine();
            if (ImGui::Button(localize("form.no"), ImVec2(120, 0))) {
                ImGui::CloseCurrentPopup();
            }
            ImGui::EndPopup();
        }

        ImGui::EndTable();
    }
}