#include <stdio.h>

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

static view_state current_view_state = view_state::LIST;
static project selected_for_cancellation;

static project active_project;

void ui_setup_projects()
{
    current_view_state = view_state::LIST;
    active_project = administration_project_create_empty();
}

static void draw_project_form()
{
    static const char* selected_country = NULL;

    if (ImGui::Button(localize("form.back"))) {
        current_view_state = view_state::LIST;
        active_project = administration_project_create_empty();
        selected_country = 0;
        return;
    }
    ImGui::Spacing();

    bool viewing_only = (current_view_state == view_state::VIEW);

    ImGui::BeginDisabled();

    float widthAvailable = ImGui::GetContentRegionAvail().x;
    
    ImGui::SetNextItemWidth(widthAvailable*0.2f);
    ImGui::InputText(localize("project.form.identifier"), active_project.id, IM_ARRAYSIZE(active_project.id));
    if (!viewing_only) ImGui::EndDisabled();

    ImGui::SetNextItemWidth(widthAvailable*0.5f);
    ImGui::InputTextWithHint(localize("project.form.description"), localize("project.form.description"), active_project.description, IM_ARRAYSIZE(active_project.description));
    ImGui::SameLine();ui_helper_draw_required_tag();   

    if (viewing_only) ImGui::EndDisabled();

    if (!viewing_only) {
        bool can_save = administration_project_is_valid(active_project);

        if (!can_save) ImGui::BeginDisabled();
        // Save button
        ImGui::Spacing();
        if (ImGui::Button(localize("form.save"))) {
            if (current_view_state == view_state::CREATE)
                administration_project_add(active_project);

            else if (current_view_state == view_state::EDIT)
                administration_project_update(active_project);

            current_view_state = view_state::LIST;
            selected_country = 0;
            active_project = administration_project_create_empty();
        }
        if (!can_save) ImGui::EndDisabled();
    }
    else {
        // TODO list invoices connected to project.
    }
}

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

    if (ImGui::Button(localize("form.create")))
    {
        current_view_state = view_state::CREATE;
        active_project = administration_project_create_empty();
    }

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

    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);

    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("TableProjects", 4, ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg)) {

        ImGui::TableSetupColumn(localize("project.table.identifier"), ImGuiTableColumnFlags_WidthFixed, 80);
        ImGui::TableSetupColumn(localize("project.table.status"), ImGuiTableColumnFlags_WidthFixed, 140);
        ImGui::TableSetupColumn(localize("project.table.description"), ImGuiTableColumnFlags_WidthStretch);
        ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthFixed, 160);
        ImGui::TableHeadersRow();

        project project_list[items_per_page];
        u32 project_count = administration_project_get_partial_list(current_page, items_per_page, project_list);

        for (u32 i = 0; i < project_count; i++) {
            project c = project_list[i];
            
            ImGui::TableNextRow();
            ImGui::TableSetColumnIndex(0); ImGui::Text(c.id);
            ImGui::TableSetColumnIndex(1); ImGui::Text(localize(administration_project_get_status_string(c)));
            ImGui::TableSetColumnIndex(2); ImGui::Text(c.description);

            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_project = c;
                current_view_state = view_state::VIEW;
            }

            if (c.state == project_state::PROJECT_RUNNING)
            {
                ImGui::SameLine();       
                snprintf(btn_name, sizeof(btn_name), "%s##%d", localize("form.change"), i);
                if (ImGui::Button(btn_name)) {
                    active_project = c;
                    current_view_state = view_state::EDIT;
                }
                     
                ImGui::SameLine();
                snprintf(btn_name, sizeof(btn_name), "%s##%d", localize("form.cancel"), i);
                if (ImGui::Button(btn_name)) {
                    selected_for_cancellation = c;
                    ImGui::OpenPopup("ConfirmCancelProject");
                }
            }
        }

        if (ImGui::BeginPopupModal("ConfirmCancelProject", nullptr, ImGuiWindowFlags_AlwaysAutoResize|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoTitleBar)) {
            ImGui::Text(localize("form.confirmCancelProject"));
            ImGui::Separator();

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

        ImGui::EndTable();
    }
}

void ui_draw_projects()
{
    switch(current_view_state)
    {
        case view_state::LIST: draw_project_list(); break;
        case view_state::CREATE: draw_project_form(); break;
        case view_state::EDIT: draw_project_form(); break;
        case view_state::VIEW: draw_project_form(); break;
    }
}