#include "power_setpoint_executor.h"

#include "charger_config.h"
#include "charger_control.h"
#include "debug.h"
#include "psu_control.h"
#include "serial.h"

static PowerSetpoint_t applied;
static PowerSetpoint_t pending;
static PowerSetpoint_t fd_target;
static uint8_t setpoint_dirty;
static uint8_t fd_active;
static uint8_t power_delivery_latched;
static uint8_t fast_discharge_count;
static uint32_t last_fast_discharge_ms;
static uint32_t measured_high_current_since_ms;

static uint8_t session_ended_state(CONN_State_t state)
{
	return (state == Unknown) || (state == Unplugged) || (state == Finished) ||
	       (state == FinishedEV) || (state == FinishedEVSE);
}

void PowerSetpoint_Init(void)
{
	applied.voltage_V = PSU_MIN_VOLTAGE;
	applied.current_0p1A = 0u;
	pending = applied;
	fd_target = applied;
	setpoint_dirty = 0u;
	fd_active = 0u;
	power_delivery_latched = 0u;
	fast_discharge_count = 0u;
	last_fast_discharge_ms = 0u;
	measured_high_current_since_ms = 0u;
}

void PowerSetpoint_OnCommand(uint16_t voltage_V, uint16_t current_0p1A)
{
#if PSD_ENABLE
	pending.voltage_V = voltage_V;
	pending.current_0p1A = current_0p1A;
	setpoint_dirty = 1u;
#else
	(void)voltage_V;
	(void)current_0p1A;
#endif
}

void PowerSetpoint_UpdateDeliveryLatch(void)
{
#if PSD_ENABLE
	uint32_t now = HAL_GetTick();

	if (!CONN.EnableOutput || !CONN.EvConnected || session_ended_state(CCS_EvseState)) {
		power_delivery_latched = 0u;
		fast_discharge_count = 0u;
		last_fast_discharge_ms = 0u;
		measured_high_current_since_ms = 0u;
		return;
	}

	if (CONN.WantedCurrent > PSD_MAX_CMD_CURRENT_0P1A) {
		power_delivery_latched = 1u;
	}

	if (CCS_EvseState == Charging) {
		power_delivery_latched = 1u;
	}

	if (CONN.MeasuredCurrent >= PSD_MAX_MEASURED_CURRENT_0P1A) {
		if (measured_high_current_since_ms == 0u) {
			measured_high_current_since_ms = now;
		} else if ((now - measured_high_current_since_ms) >= PSD_MEASURED_LATCH_MS) {
			power_delivery_latched = 1u;
		}
	} else {
		measured_high_current_since_ms = 0u;
	}
#endif
}

uint8_t PowerSetpoint_HasPending(void)
{
#if PSD_ENABLE
	return setpoint_dirty;
#else
	return 0u;
#endif
}

uint8_t PowerSetpoint_IsBusy(void)
{
#if PSD_ENABLE
	if (!fd_active) {
		return 0u;
	}
	switch (PSU0.state) {
	case PSU_FAST_DISCHARGE_OFF:
	case PSU_FAST_DISCHARGE_WAIT:
	case PSU_FAST_DISCHARGE_SET:
	case PSU_FAST_DISCHARGE_ON:
	case PSU_FAST_DISCHARGE_ON_WAIT:
		return 1u;
	default:
		return 0u;
	}
#else
	return 0u;
#endif
}

static PowerPathContext_t build_context(void)
{
	PowerPathContext_t ctx;

	ctx.dc_contactor_closed = PSU0.CONT_enabled;
	ctx.psu_hv_enabled = PSU0.PSU_enabled;
	ctx.measured_voltage_V = CONN.MeasuredVoltage;
	ctx.measured_current_0p1A = (uint16_t)CONN.MeasuredCurrent;
	ctx.power_delivery_active = power_delivery_latched;
	ctx.enable_output = CONN.EnableOutput;
	ctx.psu_state_connected = (PSU0.state == PSU_CONNECTED) ? 1u : 0u;
	ctx.psu_cont_fault = PSU0.cont_fault;
	ctx.psu_fault = PSU0.psu_fault;
	ctx.fast_discharge_count = fast_discharge_count;
	ctx.last_fast_discharge_ms = last_fast_discharge_ms;
	ctx.now_ms = HAL_GetTick();
	return ctx;
}

PowerSetpointTryResult_t PowerSetpoint_TryApply(void)
{
#if PSD_ENABLE
	PowerPathContext_t ctx;
	PowerSetpointAction_t action;

	if (!setpoint_dirty || fd_active) {
		return PSD_TRY_IDLE;
	}

	ctx = build_context();
	action = PowerSetpoint_Decide(&applied, &pending, &ctx);

	if (action == POWER_SETPOINT_FAST_DISCHARGE) {
		fd_target = pending;
		fd_active = 1u;
		setpoint_dirty = 0u;
		log_printf(LOG_INFO, "Fast discharge trigger %u->%u I=%u\n",
		           (unsigned)applied.voltage_V,
		           (unsigned)fd_target.voltage_V,
		           (unsigned)fd_target.current_0p1A);
		return PSD_TRY_START_FAST_DISCHARGE;
	}

	if (!PSU0.ready) {
		return PSD_TRY_IDLE;
	}

	PSU_SetVoltageCurrent(0, pending.voltage_V, pending.current_0p1A);
	applied = pending;
	setpoint_dirty = 0u;
	return PSD_TRY_APPLIED_NORMAL;
#else
	return PSD_TRY_IDLE;
#endif
}

void PowerSetpoint_GetFastDischargeTarget(PowerSetpoint_t *target)
{
	if (target != 0) {
		*target = fd_target;
	}
}

void PowerSetpoint_OnFastDischargeComplete(void)
{
#if PSD_ENABLE
	applied = fd_target;
	fd_active = 0u;
	fast_discharge_count++;
	last_fast_discharge_ms = HAL_GetTick();
	log_printf(LOG_INFO, "Fast discharge complete, V=%u\n", (unsigned)CONN.MeasuredVoltage);
#endif
}

void PowerSetpoint_OnFastDischargeAbort(void)
{
#if PSD_ENABLE
	fd_active = 0u;
	pending = fd_target;
	setpoint_dirty = 1u;
	log_printf(LOG_WARN, "Fast discharge aborted, V=%u\n", (unsigned)CONN.MeasuredVoltage);
#endif
}