-- sporel-module-vagrant-skeleton v0.1.0
-- F.vagrant Tier-1 Phase 1: single-player + puppet + WASD + maps v0.1.

local input  = require("lib-core.input")
local camera = require("lib-core.camera")
local r_lib  = require("lib-core.render")
local maps   = require("lib-core.maps")
local puppet = require("lib-core.puppet")

local M = {}

local state = {
    player = nil,
    player_speed = 120,
    map = nil,
}

-- CI hook gating (mirrors squad-prototype convention)
local CI_FRAME_PERF = (os.getenv("SPOREL_CI") == "1")
local ci_frame_count = 0
local ci_t_start     = nil

local function set_walk_or_idle(moving)
    if moving then
        if not puppet.is_playing(state.player, "walk") then
            puppet.stop(state.player, "idle")
            puppet.play(state.player, "walk", { loop = true })
        end
    else
        if not puppet.is_playing(state.player, "idle") then
            puppet.stop(state.player, "walk")
            puppet.play(state.player, "idle", { loop = true })
        end
    end
end

function M.init(ctx)
    state.map = maps.load("maps/vagrant_test.map.json")
    maps.set_current(state.map)

    -- Load puppet rig + animations
    local rig = puppet.load_rig("rigs/humanoid.rig.json")
    state.player = puppet.spawn(rig, { x = 320, y = 240 })

    local idle = puppet.load_animation("animations/idle.anim.json", rig)
    local walk = puppet.load_animation("animations/walk.anim.json", rig)
    puppet.register_animation(state.player, idle)
    puppet.register_animation(state.player, walk)
    puppet.play(state.player, "idle", { loop = true })

    -- Input bindings (WASD direct movement + ESC)
    input.bind("walk_left",  { "a" })
    input.bind("walk_right", { "d" })
    input.bind("walk_up",    { "w" })
    input.bind("walk_down",  { "s" })
    input.bind("quit_to_launcher", { "escape" })

    -- Camera follows player position (no manual pan in vagrant-style)
    camera.set_target_provider(function()
        return puppet.position(state.player)
    end)

    if CI_FRAME_PERF then
        ci_t_start = engine.time.now()
    end
end

function M.update(ctx, dt)
    if input.was_action_pressed("quit_to_launcher") then
        engine.switch_module("lib-sporel.launcher")
        return
    end

    local dx, dy = 0, 0
    if input.is_action_down("walk_left")  then dx = dx - 1 end
    if input.is_action_down("walk_right") then dx = dx + 1 end
    if input.is_action_down("walk_up")    then dy = dy - 1 end
    if input.is_action_down("walk_down")  then dy = dy + 1 end

    local moving = (dx ~= 0 or dy ~= 0)
    if moving then
        local len = math.sqrt(dx * dx + dy * dy)
        local pos = puppet.position(state.player)
        puppet.move_to(state.player,
            pos.x + dx / len * state.player_speed * dt,
            pos.y + dy / len * state.player_speed * dt)
    end
    set_walk_or_idle(moving)

    -- Headtrack: head looks at mouse world-position
    local mx, my = engine.input.get_mouse_pos()
    local wx, wy = camera.screen_to_world(mx, my)
    puppet.set_look_target(state.player, wx, wy)

    camera.update(dt)
    puppet.update(dt)

    -- CI: perf canary. After 60 frames emit avg ms, exit.
    if CI_FRAME_PERF and ci_t_start then
        ci_frame_count = ci_frame_count + 1
        if ci_frame_count == 60 then
            local elapsed_ms = (engine.time.now() - ci_t_start) * 1000.0
            local avg = elapsed_ms / 60.0
            print(string.format("vagrant: frame_avg_ms=%.2f", avg))
            engine.exit(0)
        end
    end
end

function M.draw(ctx)
    r_lib.draw_map()
    puppet.render(state.player)
    -- Render-hook trace for smoke (P0-S25a). MUST emit from render(), not update().
    -- Lesson from P.4.c: smoke stages that exit in update never prove the render
    -- hook works.
    if CI_FRAME_PERF then
        engine.print("vagrant: render_frame_ok")
    end
end

-- ====================================================================
-- Engine lifecycle hooks (global functions; engine calls these by name)
-- See P.4.c discovery: engine looks up lua_getglobal "init", "update",
-- "render" — not M.init etc. The module-table pattern is bridged here.
-- ====================================================================
function init(ctx)    M.init(ctx)        end
function update(ctx, dt) M.update(ctx, dt) end
function render(ctx)  M.draw(ctx)        end

return M