local maps        = require("lib-core.maps")
local r_lib       = require("lib-core.render")
local camera      = require("lib-core.camera")
local input       = require("lib-core.input")
local player      = require("lib-core.player_control")
local interaction = require("lib-core.interaction")
local selection   = require("lib-core.selection")
local command    = require("lib-core.command")

local demo_map = maps.load("maps/demo.map.json")
maps.set_current(demo_map)

local m_size = maps.size()
local t_size = maps.tile_size()
local map_center_x = (m_size.w * t_size) / 2
local map_center_y = (m_size.h * t_size) / 2

camera.set_target(map_center_x, map_center_y)
camera.set_zoom(1.0)

-- Bind input actions (string-key-names per lib-core.input v0.2.0)
input.bind("quit",       { "escape" })
input.bind("move_left",  { "a", "left" })
input.bind("move_right", { "d", "right" })
input.bind("move_up",    { "w", "up" })
input.bind("move_down",  { "s", "down" })
input.bind("interact",   { "e" })
-- P.3.5: Free-Cam demo (Tab toggle)
input.bind("toggle_free_cam", { "tab" })
input.bind("pan_drag",        { "mouse_middle" })
-- pan_*-Actions teilen sich die Keys mit move_*-Actions (additive bindings).
input.bind("pan_left",        { "a", "left" })
input.bind("pan_right",       { "d", "right" })
input.bind("pan_up",          { "w", "up" })
input.bind("pan_down",        { "s", "down" })
-- P.3.6: Selection bindings
input.bind("lmb",        { "mouse_left" })
input.bind("mod_add",    { "shift" })
input.bind("mod_toggle", { "ctrl" })

selection.bind_action("lmb")
selection.bind_modifier_add("mod_add")
selection.bind_modifier_toggle("mod_toggle")

-- P.3.7: Command bindings (RMB → move selected units).
input.bind("rmb", { "mouse_right" })

command.bind_move_action("rmb")
command.bind_target_provider(function() return selection.list() end)

camera.bind_pan_keys("pan_left", "pan_right", "pan_up", "pan_down")
camera.bind_pan_drag("pan_drag")
camera.enable_pan_edge()
-- Start in follow-mode: pan_keys aus (drag/edge bleiben enabled, sind aber
-- unsichtbar in follow-mode wegen set_target-override jeden Frame).
camera.set_pan_enabled("keys", false)

-- Configure player: defaults are 24x24 + 200 px/sec; place at map-center
local p_size = player.size()
player.set_position(map_center_x - p_size.w / 2, map_center_y - p_size.h / 2)
player.bind_movement("move_left", "move_right", "move_up", "move_down")

local PLAYER_R, PLAYER_G, PLAYER_B = 200, 60, 80

-- Sign as module-local (actor deferred — see actor-deferral spec)
-- Tile (4,4) center: 4*32+16 = 144 px in walkable grass-area
local sign = { x = 144, y = 144, text = "Hier steht: Willkommen im Spine." }
local SIGN_R, SIGN_G, SIGN_B = 220, 200, 60

-- P.3.6/P.3.7: 6 stones as selectables + movable units (3 speed classes).
local stones = {
    { x =  64, y =  96, w = 20, h = 20, color = {120, 120, 140}, speed = 100 },
    { x = 224, y =  96, w = 20, h = 20, color = {120, 120, 140}, speed = 100 },
    { x =  96, y = 256, w = 20, h = 20, color = {130, 110, 100}, speed = 150 },
    { x = 320, y = 192, w = 20, h = 20, color = {130, 110, 100}, speed = 150 },
    { x = 192, y = 320, w = 20, h = 20, color = {140, 130, 110}, speed = 200 },
    { x = 384, y = 256, w = 20, h = 20, color = {140, 130, 110}, speed = 200 },
}

-- P.3.5: Free-Cam-Mode state
local free_cam_mode = false

local frames = 0
local TARGET_FRAMES = 60

function init(ctx)
    engine.print("spine-prototype init: maps loaded")
    engine.print(string.format("map size: %dx%d", m_size.w, m_size.h))
    local corner = maps.tile_at(0, 0)
    local interior = maps.tile_at(5, 5)
    engine.print("tile at (0,0): " .. corner.id)
    engine.print("tile at (5,5): " .. interior.id)
    engine.print("walkable at (0,0): " .. tostring(maps.is_walkable(0, 0)))
    engine.print("walkable at (5,5): " .. tostring(maps.is_walkable(5, 5)))
    engine.print(string.format("render: %d tiles per frame", m_size.w * m_size.h))
    local t = camera.target()
    engine.print(string.format("camera: target=(%d,%d) zoom=%.2f", t.x, t.y, camera.zoom()))
    engine.print(string.format("input: %d actions bound", input.action_count()))
    local p = player.position()
    local s = player.size()
    engine.print(string.format("player: pos=(%d,%d) size=%dx%d speed=%d",
        p.x, p.y, s.w, s.h, player.speed()))

    interaction.register(sign.x, sign.y, 40, "interact", function(info)
        engine.print(sign.text)
    end)
    engine.print(string.format("interaction: %d trigger(s) registered",
        interaction.trigger_count()))
    -- P.3.6/P.3.7: Register each stone as selectable AND movable.
    for _, s in ipairs(stones) do
        s.sel_handle = selection.register(function()
            return { x = s.x, y = s.y, w = s.w, h = s.h }
        end)
        s.cmd_handle = command.register(
            function() return { x = s.x, y = s.y } end,
            function(nx, ny) s.x = nx; s.y = ny end,
            s.speed
        )
    end
    engine.print(string.format("selection: %d selectables registered",
        selection.count_registered()))
    engine.print(string.format("command: %d movable units registered",
        command.count_registered()))
end

function render(ctx)
    engine.render.clear_color(engine.render.rgb(20, 20, 30))
    camera.begin()
        maps.draw_map_pre_entities()
        -- draw sign on top of map
        engine.render.draw_rect(sign.x - 6, sign.y - 6, 12, 12,
            engine.render.rgb(SIGN_R, SIGN_G, SIGN_B))
        -- P.3.6: draw stones
        for _, s in ipairs(stones) do
            engine.render.draw_rect(s.x, s.y, s.w, s.h,
                engine.render.rgb(s.color[1], s.color[2], s.color[3]))
        end
        -- draw player on top of map/stones
        local p = player.position()
        local sz = player.size()
        engine.render.draw_rect(p.x, p.y, sz.w, sz.h,
            engine.render.rgb(PLAYER_R, PLAYER_G, PLAYER_B))
        -- P.3.6: highlights over selected entities (world-space)
        selection.render_highlights()
        maps.draw_map_post_entities()
    camera.finish()
    -- P.3.6: drag-box overlay (screen-space, after camera.finish)
    selection.render_drag_box()
end

function update(ctx, dt)
    if input.was_action_pressed("quit") then
        -- ADR-0028: ESC returns to launcher per P.3.4.
        engine.switch_module("lib-sporel.launcher")
        return
    end

    -- P.3.5: Tab toggles between follow-cam and free-cam.
    if input.was_action_pressed("toggle_free_cam") then
        free_cam_mode = not free_cam_mode
        camera.set_pan_enabled("keys", free_cam_mode)
    end

    -- Player + interaction nur in follow-mode (in free-cam ist player pausiert).
    if not free_cam_mode then
        player.update(dt)
        local p = player.position()
        local s = player.size()
        interaction.update(p.x + s.w / 2, p.y + s.h / 2)
    end

    -- Pan-Summation jeden Frame (keys nur wenn enabled; drag + edge always-on).
    camera.update(dt)
    selection.update(dt)
    command.update(dt)

    if not free_cam_mode then
        -- Follow-cam: set_target jeden Frame -> drag/edge "drift" wird unsichtbar.
        local p = player.position()
        local s = player.size()
        camera.set_target(p.x + s.w / 2, p.y + s.h / 2)
    end

    -- CI-conditional self-exit (unverändert aus P.0):
    frames = frames + 1
    if os.getenv("SPOREL_CI") == "1" and frames >= TARGET_FRAMES then
        engine.exit(0)
    end
end

function cleanup(ctx)
    engine.print("spine-prototype cleanup: total_frames=" .. frames)
end