--[[
Copyright 2025 Andrey Stepanov

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--


local S = minetest.get_translator("medical")
local ui = unified_inventory


local _contexts = {}

local function get_context(name)
    local context = _contexts[name] or {}
    _contexts[name] = context
    return context
end

minetest.register_on_leaveplayer(
    function(player)
        _contexts[player:get_player_name()] = nil
    end
)


local pfp = {
    padding = 0.1,
    group_btn_step = 0.9,
    section_bg = "#22222266",
}


local function draw_group_btn(button, active, x)
    local suffix = nil
    if active == true then
        suffix = "active"
    else
        suffix = "inactive"
    end

    local formspec = {
        "image_button[",
            x, ",0;",
            "0.8,0.8;",
            button.name, "_", suffix, ".png;",
            button.name, ";",
            ";",
            "false;",
            "false;",
        "]",
        "tooltip[",
            button.name, ";",
            button.label,
        "]"
    }

    return table.concat(formspec)
end


local groups = {
    {
        name = "triage_card",
        label = S("Triage Card"),
        get_formspec = function()
            local formspec = {
                "label[",
                    pfp.padding, ",", pfp.padding+0.2, ";",
                    S("No entries on this triage card."),
                "]"
            }
            return table.concat(formspec)
        end
    },
    {
        name = "examine_patient",
        label = S("Examine patient"),
    },
    {
        name = "bandage_fracture",
        label = S("Bandage / Fracture"),
    },
    {
        name = "medication",
        label = S("Medication"),
    },
    {
        name = "advanced_treatment",
        label = S("Advanced treatment"),
    },
}


local function draw_groups(active_group_name, groups_width)
    local formspec = {}

    local active_group = nil
    for i, group in ipairs(groups) do
        local is_active = false
        if active_group_name == group.name then
            is_active = true
            active_group = group
        end
        table.insert(formspec, draw_group_btn(group, is_active, pfp.padding+(i-1)*pfp.group_btn_step))
    end
    local groups_bg = {
        "box[",
            "0,", pfp.group_btn_step, ";",
            groups_width - pfp.padding, ",3.2;",
            pfp.section_bg,
        "]"
    }
    table.insert(formspec, table.concat(groups_bg))
    if active_group and active_group.get_formspec then
        local container = {
            "container[",
                "0,", pfp.group_btn_step,
            "]"
        }
        table.insert(
            formspec,
            table.concat(container)
        )
        table.insert(
            formspec,
            active_group.get_formspec()
        )
        table.insert(
            formspec,
            "container_end[]"
        )
    end
    return table.concat(formspec)
end


local function draw_body_part(x, y, w, h, name, caption)
    local formspec = {
        "image_button[",
            x, ",", y, ";",
            w, ",", h, ";",
            name, ".png;", name, ";;",
            "false;false;",
        "]",
        "tooltip[",
            name, ";",
            caption,
        "]"
    }
    return table.concat(formspec)
end


local function draw_body(center_x, scale)
    local leg_w = scale * 0.8
    local leg_offset = scale * 0.02
    local formspec = {
        draw_body_part(
            center_x - scale/2, 0,
            scale, scale,
            "head", S("Head")
        ),
        draw_body_part(
            center_x - scale/2, scale,
            scale, scale*2,
            "torso", S("Torso")
        ),
        draw_body_part(
            center_x - scale*1.5, scale,
            scale, scale*1.8,
            "right_hand", S("Right Hand")
        ),
        draw_body_part(
            center_x + scale/2, scale,
            scale, scale*1.8,
            "left_hand", S("Left Hand")
        ),
        draw_body_part(
            center_x - leg_w - leg_offset, scale*3,
            leg_w, scale*1.8,
            "right_leg", S("Right Leg")
        ),
        draw_body_part(
            center_x + leg_offset, scale*3,
            leg_w, scale*1.8,
            "left_leg", S("Left Leg")
        )
    }
    return table.concat(formspec)
end


ui.register_page(
    "health",
    {
        get_formspec = function(player, perplayer_formspec)
            local active_group_name = get_context(player:get_player_name()).active_group or groups[1].name

            local fp = perplayer_formspec
            local form_width = fp.formw - fp.form_header_x * 2
            local section_width = form_width / 3
            local formspec = {
                perplayer_formspec.standard_inv_bg,
                "container[",
                    fp.form_header_x, ",", fp.form_header_y, ";",
                "]",
                    "box[",
                        "0,0;",
                        form_width, ",", 0.4, ";",
                        "orange",
                    "]",
                    "label[",
                        pfp.padding, ",0.2;",
                        player:get_player_name(),
                    "]",
                    "container[0,0.65]",
                        "label[",
                            pfp.padding, ",0;",
                            S("EXAMINE & TREATMENT"),
                        "]",
                        "label[",
                            section_width + pfp.padding, ",0;",
                            S("STATUS"),
                        "]",
                        "label[",
                            section_width * 2 + pfp.padding, ",0;",
                            S("OVERVIEW"),
                        "]",
                        "box[",
                            "0,0.14;",
                            form_width, ",0.02;",
                            "darkgray",
                        "]",
                        "container[0,0.35]",
                            draw_groups(active_group_name, section_width),
                            draw_body(section_width * 1.5, 0.8),
                            "box[",
                                section_width * 2, ",0;",
                                section_width, ",9;",
                                pfp.section_bg,
                            "]",
                        "container_end[]",
                    "container_end[]",
                "container_end[]"
            }
            return {
                formspec = table.concat(formspec),
                draw_inventory = true,
                draw_item_list = false
            }
        end
    }
)

ui.register_button(
    "health",
    {
        type = "image",
        image = "redcross.png",
        tooltip = S("Medical Menu")
    }
)

minetest.register_on_player_receive_fields(
    function(player, formname, fields)
        if formname ~= "" then
            return
        end

        for _, group in ipairs(groups) do
            if fields[group.name] then
                get_context(player:get_player_name()).active_group = group.name
                ui.set_inventory_formspec(player, "health")
                return
            end
        end
    end
)