import functools

from state.devstate import DevState
from bootstrap.scd import bootstrap_scd
from framework.conformance import Conformance, render_conformance_check_result
from concrete_syntax.textual_od import parser, renderer
from concrete_syntax.plantuml import renderer as plantuml
from api.od import ODAPI

from examples.semantics.operational.simulator import Simulator, RandomDecisionMaker, InteractiveDecisionMaker, make_actions_pure, filter_valid_actions


state = DevState()
scd_mmm = bootstrap_scd(state) # Load meta-meta-model

### Load (meta-)models ###

# Design meta-model
woods_mm_cs = """
    Animal:Class {
        abstract = True;
    }

    Bear:Class
    :Inheritance (Bear -> Animal)

    Man:Class {
        lower_cardinality = 1;
        upper_cardinality = 2;
        constraint = `get_value(get_slot(this, "weight")) > 20`;
    }
    :Inheritance (Man -> Animal)


    Man_weight:AttributeLink (Man -> Integer) {
        name = "weight";
        optional = False;
    }

    afraidOf:Association (Man -> Animal) {
        source_upper_cardinality = 6;
        target_lower_cardinality = 1;
    }
"""
# Runtime meta-model
woods_rt_mm_cs = woods_mm_cs + """
    AnimalState:Class {
        abstract = True;
    }
    AnimalState_dead:AttributeLink (AnimalState -> Boolean) {
        name = "dead";
        optional = False;
    }    
    of:Association (AnimalState -> Animal) {
        source_lower_cardinality = 1;
        source_upper_cardinality = 1;
        target_lower_cardinality = 1;
        target_upper_cardinality = 1;    
    }

    BearState:Class {
        constraint = `get_type_name(get_target(get_outgoing(this, "of")[0])) == "Bear"`;
    }
    :Inheritance (BearState -> AnimalState)
    BearState_hunger:AttributeLink (BearState -> Integer) {
        name = "hunger";
        optional = False;
        constraint = ```
            val = get_value(get_target(this))
            val >= 0 and val <= 100
        ```;
    }

    ManState:Class {
        constraint = `get_type_name(get_target(get_outgoing(this, "of")[0])) == "Man"`;
    }
    :Inheritance (ManState -> AnimalState)

    attacking:Association (AnimalState -> ManState) {
        # Animal can only attack one Man at a time
        target_upper_cardinality = 1;

        # Man can only be attacked by one Animal at a time
        source_upper_cardinality = 1;

        constraint = ```
            attacker = get_source(this)
            if get_type_name(attacker) == "BearState":
                # only BearState has 'hunger' attribute
                hunger = get_value(get_slot(attacker, "hunger"))
            else:
                hunger = 100 # Man can always attack
            attacker_dead = get_value(get_slot(attacker, "dead"))
            attacked_state = get_target(this)
            attacked_dead = get_value(get_slot(attacked_state, "dead"))
            (
                hunger >= 50 
                and not attacker_dead # cannot attack while dead
                and not attacked_dead # cannot attack whoever is dead
            )
        ```;
    }

    attacking_starttime:AttributeLink (attacking -> Integer) {
        name = "starttime";
        optional = False;
        constraint = ```
            val = get_value(get_target(this))
            _, clock = get_all_instances("Clock")[0]
            current_time = get_slot_value(clock, "time")
            val >= 0 and val <= current_time
        ```;
    }

    # Just a clock singleton for keeping the time
    Clock:Class {
        lower_cardinality = 1;
        upper_cardinality = 1;
    }
    Clock_time:AttributeLink (Clock -> Integer) {
        name = "time";
        optional = False;
        constraint = `get_value(get_target(this)) >= 0`;
    }
"""

# Our design model - the part that doesn't change
woods_m_cs = """
    george:Man {
        weight = 80;
    }
    bill:Man {
        weight = 70;
    }

    teddy:Bear
    mrBrown:Bear

    # george is afraid of both bears
    :afraidOf (george -> teddy)
    :afraidOf (george -> mrBrown)

    # the men are afraid of each other
    :afraidOf (bill -> george)
    :afraidOf (george -> bill)
"""

# Our runtime model - the part that changes with every execution step
woods_rt_initial_m_cs = woods_m_cs + """
    georgeState:ManState {
        dead = False;
    }
    :of (georgeState -> george)

    billState:ManState {
        dead = False;
    }
    :of (billState -> bill)

    teddyState:BearState {
        dead = False;
        hunger = 40;
    }
    :of (teddyState -> teddy)

    mrBrownState:BearState {
        dead = False;
        hunger = 80;
    }
    :of (mrBrownState -> mrBrown)

    clock:Clock {
        time = 0;
    }
"""

def parse_and_check(m_cs: str, mm, descr: str):
    m = parser.parse_od(
        state,
        m_text=m_cs,
        mm=mm)
    conf = Conformance(state, m, mm)
    print(descr, "...", render_conformance_check_result(conf.check_nominal()))
    return m

woods_mm    = parse_and_check(woods_mm_cs,           scd_mmm,     "MM")
woods_rt_mm = parse_and_check(woods_rt_mm_cs,        scd_mmm,     "RT-MM")
woods_m     = parse_and_check(woods_m_cs,            woods_mm,    "M")
woods_rt_m  = parse_and_check(woods_rt_initial_m_cs, woods_rt_mm, "RT-M")

print()


### Semantics ###

# Helpers
def state_of(od, animal):
    return od.get_source(od.get_incoming(animal, "of")[0])
def animal_of(od, state):
    return od.get_target(od.get_outgoing(state, "of")[0])
def get_time(od):
    _, clock = od.get_all_instances("Clock")[0]
    return clock, od.get_slot_value(clock, "time")

# Action: Time advances, whoever is being attacked dies, bears become hungrier
def action_advance_time(od):
    msgs = []
    clock, old_time = get_time(od)
    new_time = old_time + 1
    od.set_slot_value(clock, "time", new_time)

    for _, attacking_link in od.get_all_instances("attacking"):
        man_state = od.get_target(attacking_link)
        animal_state = od.get_source(attacking_link)
        if od.get_type_name(animal_state) == "BearState":
            od.set_slot_value(animal_state, "hunger", max(od.get_slot_value(animal_state, "hunger") - 50, 0))
        od.set_slot_value(man_state, "dead", True)
        od.delete(attacking_link)
        msgs.append(f"{od.get_name(animal_of(od, animal_state))} kills {od.get_name(animal_of(od, man_state))}.")

    for _, bear_state in od.get_all_instances("BearState"):
        if od.get_slot_value(bear_state, "dead"):
            continue # bear already dead
        old_hunger = od.get_slot_value(bear_state, "hunger")
        new_hunger = min(old_hunger + 10, 100)
        od.set_slot_value(bear_state, "hunger", new_hunger)
        bear = od.get_target(od.get_outgoing(bear_state, "of")[0])
        bear_name = od.get_name(bear)
        if new_hunger == 100:
            od.set_slot_value(bear_state, "dead", True)
            msgs.append(f"Bear {bear_name} dies of hunger.")
        else:
            msgs.append(f"Bear {bear_name}'s hunger level is now {new_hunger}.")
    return msgs

# Action: Animal attacks Man
# Note: We must use the names of the objects as parameters, because when cloning, the IDs of objects change!
def action_attack(od, animal_name: str, man_name: str):
    msgs = []
    animal = od.get(animal_name)
    man = od.get(man_name)
    animal_state = state_of(od, animal)
    man_state = state_of(od, man)
    attack_link = od.create_link(None, # auto-generate link name
        "attacking", animal_state, man_state)
    _, clock = od.get_all_instances("Clock")[0]
    current_time = od.get_slot_value(clock, "time")
    od.set_slot_value(attack_link, "starttime", current_time)
    msgs.append(f"{animal_name} is now attacking {man_name}")
    return msgs

# Get all actions that can be performed (including those that bring us to a non-conforming state)
def get_all_actions(od):
    def _generate_actions(od):
        # can always advance time:
        yield ("advance time", action_advance_time)

        # if A is afraid of B, then B can attack A:
        for _, afraid_link in od.get_all_instances("afraidOf"):
            man = od.get_source(afraid_link)
            animal = od.get_target(afraid_link)
            animal_name = od.get_name(animal)
            man_name = od.get_name(man)
            man_state = state_of(od, man)
            animal_state = state_of(od, animal)
            descr = f"{animal_name} ({od.get_type_name(animal)}) attacks {man_name} ({od.get_type_name(man)})"
            yield (descr, functools.partial(action_attack, animal_name=animal_name, man_name=man_name))

    return make_actions_pure(_generate_actions(od), od)

# Only get those actions that bring us to a conforming state
def get_valid_actions(od):
    return filter_valid_actions(get_all_actions(od))

# Render our run-time state to a string
def render_woods(od):
    txt = ""
    _, time = get_time(od)
    txt += f"T = {time}.\n"
    txt += "Bears:\n"
    def render_attacking(animal_state):
        attacking = od.get_outgoing(animal_state, "attacking")
        if len(attacking) == 1:
            whom_state = od.get_target(attacking[0])
            whom_name = od.get_name(animal_of(od, whom_state))
            return f" attacking {whom_name}"
        else:
            return ""
    def render_dead(animal_state):
        return 'dead' if od.get_slot_value(animal_state, 'dead') else 'alive'
    for _, bear_state in od.get_all_instances("BearState"):
        bear = animal_of(od, bear_state)
        hunger = od.get_slot_value(bear_state, "hunger")
        txt += f"  🐻 {od.get_name(bear)} (hunger: {hunger}, {render_dead(bear_state)}) {render_attacking(bear_state)}\n"
    txt += "Men:\n"
    for _, man_state in od.get_all_instances("ManState"):
        man = animal_of(od, man_state)
        attacked_by = od.get_incoming(man_state, "attacking")
        if len(attacked_by) == 1:
            whom_state = od.get_source(attacked_by[0])
            whom_name = od.get_name(animal_of(od, whom_state))
            being_attacked = f" being attacked by {whom_name}"
        else:
            being_attacked = ""
        txt += f"  👨 {od.get_name(man)} ({render_dead(man_state)}) {render_attacking(man_state)}{being_attacked}\n"
    return txt

# When should simulation stop?
def termination_condition(od):
    _, time = get_time(od)
    if time >= 10:
        return "Took too long"

    # End simulation when 2 animals are dead
    who_is_dead = []
    for _, animal_state in od.get_all_instances("AnimalState"):
        if od.get_slot_value(animal_state, "dead"):
            animal_name = od.get_name(animal_of(od, animal_state))
            who_is_dead.append(animal_name)
    if len(who_is_dead) >= 2:
        return f"{' and '.join(who_is_dead)} are dead"


sim = Simulator(
    action_generator=get_valid_actions,
    # action_generator=get_all_actions,
    decision_maker=RandomDecisionMaker(seed=0),
    # decision_maker=InteractiveDecisionMaker(),
    termination_condition=termination_condition,
    check_conformance=False,
    verbose=True,
    renderer=render_woods,
)

od = ODAPI(state, woods_rt_m, woods_rt_mm)

sim.run(od)