-----------------------------------
-- Table defining diferent status effect properties.
-----------------------------------
-- Info
-- Resistance:  https://wiki-ffo-jp.translate.goog/html/1801.html?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc
-- Effects:     https://wiki-ffo-jp.translate.goog/html/1720.html?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc
-- Resist:      https://wiki-ffo-jp.translate.goog/html/795.html?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc
-- Immunobreak: https://wiki-ffo-jp.translate.goog/html/27204.html?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc

-- NOTE: I have yet to find a case where the effect "associated element" isnt determined by the element of the action that causes it.
-- Example: Siren's elegy is wind while spell elegies are earth. Same effect, diferent elements.
-- Unlike sleep, elegy effect doesnt have an associated "effect resistance rank" and uses "element resistance rank" instead.
-----------------------------------
xi = xi or {}
xi.data = xi.data or {}
xi.data.statusEffect = xi.data.statusEffect or {}
-----------------------------------

-- Table column names.
local column =
{
    ALLOWED_RESIST_STATE     =  1, -- The amount of times an status effect can trigger a resist before it will fail. A value higher than 2 (x >= 3) implies it will NEVER fully resist.
    EFFECT_NULLIFIED_ALWAYS  =  2, -- [effect] is nullified by { effect }. In other words, [effect] cant be applied because { effect } is active.
    EFFECT_NULLIFIED_BY_TIER =  3,
    EFFECT_NULLIFIES         =  4, -- TODO: IMPLEMENT. [effect] nullifies { effect }.
    EFFECT_ELEMENT           =  5, -- Players and most effects dont have "effect resistance ranks", so they always use the effect "associated element" "resistance rank".
    EFFECT_IMMUNITY          =  6, -- Detected by "Completely resists" message. Cant immunobreak/resistance-hack it.
    MOD_RESIST_TRAIT         =  7, -- Detected by "Resist!" message. Cant immunobreak/resistance-hack it if triggered.
    MOD_RESIST_RANK          =  8, -- TODO: IMPLEMENT. For mobs, status effects can either: Use an specific status effect ressistance rank OR use their associated element resistance rank.
    MOD_MAGIC_EVASION        =  9,
    MOD_IMMUNOBREAK          = 10,
}

-- Table associating an status effect with their corresponding immunobreak, MEVA and resistance modifiers and immunities.
xi.data.statusEffect.dataTable =
{
    [xi.effect.ADDLE              ] = { 2, 0,                       0,               xi.effect.NOCTURNE, xi.element.FIRE,    xi.immunity.ADDLE,      xi.mod.SLOWRES,     0,                          0,                    xi.mod.ADDLE_IMMUNOBREAK    }, -- Addle cant be immunobroken?
    [xi.effect.AMNESIA            ] = { 2, 0,                       0,               0,                  xi.element.FIRE,    0,                      xi.mod.AMNESIARES,  0,                          xi.mod.AMNESIA_MEVA,  0                           },
    [xi.effect.ATTACK_DOWN        ] = { 3, 0,                       0,               0,                  xi.element.WATER,   0,                      0,                  0,                          0,                    0                           },
    [xi.effect.BIND               ] = { 2, 0,                       0,               0,                  xi.element.ICE,     xi.immunity.BIND,       xi.mod.BINDRES,     xi.mod.BIND_RES_RANK,       xi.mod.BIND_MEVA,     xi.mod.BIND_IMMUNOBREAK     },
    [xi.effect.BIO                ] = { 4, 0,                       xi.effect.DIA,   0,                  xi.element.DARK,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.BLINDNESS          ] = { 1, 0,                       0,               0,                  xi.element.DARK,    xi.immunity.BLIND,      xi.mod.BLINDRES,    xi.mod.BLIND_RES_RANK,      xi.mod.BLIND_MEVA,    xi.mod.BLIND_IMMUNOBREAK    },
    [xi.effect.BURN               ] = { 2, xi.effect.DROWN,         0,               xi.effect.FROST,    xi.element.FIRE,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.CHARM_I            ] = { 1, 0,                       0,               0,                  xi.element.LIGHT,   0,                      xi.mod.CHARMRES,    0,                          xi.mod.CHARM_MEVA,    0                           }, -- TODO: charm should be moved from a mob property to a regular immunity
    [xi.effect.CHOKE              ] = { 2, xi.effect.FROST,         0,               xi.effect.RASP,     xi.element.WIND,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.CURSE_I            ] = { 2, 0,                       0,               0,                  xi.element.DARK,    0,                      xi.mod.CURSERES,    0,                          xi.mod.CURSE_MEVA,    0                           },
    [xi.effect.DEFENSE_DOWN       ] = { 3, 0,                       0,               0,                  xi.element.WIND,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.DIA                ] = { 4, 0,                       xi.effect.BIO,   0,                  xi.element.LIGHT,   0,                      0,                  0,                          0,                    0                           },
    [xi.effect.DROWN              ] = { 2, xi.effect.SHOCK,         0,               xi.effect.BURN,     xi.element.WATER,   0,                      0,                  0,                          0,                    0                           },
    [xi.effect.ELEGY              ] = { 1, 0,                       0,               0,                  xi.element.EARTH,   xi.immunity.ELEGY,      xi.mod.SLOWRES,     0,                          0,                    0                           },
    [xi.effect.EVASION_DOWN       ] = { 3, 0,                       0,               0,                  xi.element.ICE,     0,                      0,                  0,                          0,                    0                           },
    [xi.effect.FLASH              ] = { 1, 0,                       0,               0,                  xi.element.LIGHT,   xi.immunity.BLIND,      xi.mod.BLINDRES,    xi.mod.BLIND_RES_RANK,      xi.mod.BLIND_MEVA,    xi.mod.BLIND_IMMUNOBREAK    },
    [xi.effect.FROST              ] = { 2, xi.effect.BURN,          0,               xi.effect.CHOKE,    xi.element.ICE,     0,                      0,                  0,                          0,                    0                           },
    [xi.effect.HASTE              ] = { 4, 0,                       xi.effect.SLOW,  0,                  xi.element.NONE,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.HELIX              ] = { 3, 0,                       0,               0,                  xi.element.NONE,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.INHIBIT_TP         ] = { 1, 0,                       0,               0,                  xi.element.DARK,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.INUNDATION         ] = { 2, 0,                       0,               0,                  xi.element.LIGHT,   0,                      0,                  0,                          0,                    0                           },
    [xi.effect.MAGIC_EVASION_DOWN ] = { 3, 0,                       0,               0,                  xi.element.DARK,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.MUTE               ] = { 1, 0,                       0,               0,                  xi.element.WIND,    xi.immunity.SILENCE,    xi.mod.SILENCERES,  xi.mod.SILENCE_RES_RANK,    xi.mod.SILENCE_MEVA,  xi.mod.SILENCE_IMMUNOBREAK  },
    [xi.effect.NOCTURNE           ] = { 1, xi.effect.ADDLE,         0,               0,                  xi.element.FIRE,    xi.immunity.ADDLE,      xi.mod.SLOWRES,     0,                          0,                    0                           },
    [xi.effect.NONE               ] = { 1, 0,                       0,               0,                  xi.element.DARK,    xi.immunity.DISPEL,     0,                  0,                          0,                    0                           },
    [xi.effect.PARALYSIS          ] = { 1, 0,                       0,               0,                  xi.element.ICE,     xi.immunity.PARALYZE,   xi.mod.PARALYZERES, xi.mod.PARALYZE_RES_RANK,   xi.mod.PARALYZE_MEVA, xi.mod.PARALYZE_IMMUNOBREAK },
    [xi.effect.PETRIFICATION      ] = { 2, 0,                       0,               0,                  xi.element.EARTH,   xi.immunity.PETRIFY,    xi.mod.PETRIFYRES,  0,                          xi.mod.PETRIFY_MEVA,  xi.mod.PETRIFY_IMMUNOBREAK  },
    [xi.effect.PLAGUE             ] = { 2, 0,                       0,               0,                  xi.element.FIRE,    xi.immunity.PLAGUE,     xi.mod.VIRUSRES,    0,                          xi.mod.VIRUS_MEVA,    0                           },
    [xi.effect.POISON             ] = { 1, 0,                       0,               0,                  xi.element.WATER,   xi.immunity.POISON,     xi.mod.POISONRES,   xi.mod.POISON_RES_RANK,     xi.mod.POISON_MEVA,   xi.mod.POISON_IMMUNOBREAK   },
    [xi.effect.RASP               ] = { 2, xi.effect.CHOKE,         0,               xi.effect.SHOCK,    xi.element.EARTH,   0,                      0,                  0,                          0,                    0                           },
    [xi.effect.REQUIEM            ] = { 1, 0,                       0,               0,                  xi.element.LIGHT,   0,                      0,                  0,                          0,                    0                           },
    [xi.effect.SHOCK              ] = { 2, xi.effect.RASP,          0,               xi.effect.DROWN,    xi.element.THUNDER, 0,                      0,                  0,                          0,                    0                           },
    [xi.effect.SILENCE            ] = { 1, 0,                       0,               0,                  xi.element.WIND,    xi.immunity.SILENCE,    xi.mod.SILENCERES,  xi.mod.SILENCE_RES_RANK,    xi.mod.SILENCE_MEVA,  xi.mod.SILENCE_IMMUNOBREAK  },
    [xi.effect.SLEEP_I            ] = { 1, 0,                       0,               0,                  xi.element.DARK,    xi.immunity.DARK_SLEEP, xi.mod.SLEEPRES,    xi.mod.DARK_SLEEP_RES_RANK, xi.mod.SLEEP_MEVA,    xi.mod.SLEEP_IMMUNOBREAK    },
    [xi.effect.SLOW               ] = { 1, 0,                       xi.effect.HASTE, 0,                  xi.element.EARTH,   xi.immunity.SLOW,       xi.mod.SLOWRES,     xi.mod.SLOW_RES_RANK,       xi.mod.SLOW_MEVA,     xi.mod.SLOW_IMMUNOBREAK     },
    [xi.effect.STUN               ] = { 2, xi.effect.PETRIFICATION, 0,               0,                  xi.element.THUNDER, xi.immunity.STUN,       xi.mod.STUNRES,     xi.mod.STUN_RES_RANK,       xi.mod.STUN_MEVA,     0                           },
    [xi.effect.TERROR             ] = { 2, 0,                       0,               0,                  0,                  xi.immunity.TERROR,     0,                  0,                          0,                    0                           }, -- TODO: implement Resist Terror https://www.bg-wiki.com/ffxi/Resist_Terror, TODO: sometimes Terror has an element, but sometimes it does not. It seems it may only be player based effects?
    [xi.effect.THRENODY           ] = { 1, 0,                       0,               0,                  xi.element.NONE,    0,                      0,                  0,                          0,                    0                           },
    [xi.effect.WEIGHT             ] = { 1, 0,                       0,               0,                  xi.element.WIND,    xi.immunity.GRAVITY,    xi.mod.GRAVITYRES,  xi.mod.GRAVITY_RES_RANK,    xi.mod.GRAVITY_MEVA,  xi.mod.GRAVITY_IMMUNOBREAK  },
}

-----------------------------------
-- Helper functions to easily fetch table data.
-----------------------------------
xi.data.statusEffect.getLastAllowedResistanceState = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch effect ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.ALLOWED_RESIST_STATE]
    end

    return 0
end

xi.data.statusEffect.getNullificatingEffect = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch effect ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.EFFECT_NULLIFIED_ALWAYS]
    end

    return 0
end

xi.data.statusEffect.getNullificatingEffectByTier = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch effect ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.EFFECT_NULLIFIED_BY_TIER]
    end

    return 0
end

xi.data.statusEffect.getEffectToRemove = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch effect ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.EFFECT_NULLIFIES]
    end

    return 0
end

xi.data.statusEffect.getAssociatedElement = function(effectId, actionElement)
    -- Sanitize fed values
    local effectToCheck  = utils.defaultIfNil(effectId, 0)
    local elementToCheck = utils.defaultIfNil(actionElement, 0)

    -- Sleep exception.
    if effectToCheck == xi.effect.SLEEP_I then
        return elementToCheck
    end

    -- Fetch element from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.EFFECT_ELEMENT]
    end

    -- Assume the effect "element" is the same as the action element.
    return elementToCheck
end

xi.data.statusEffect.getAssociatedImmunity = function(effectId, actionElement)
    -- Sanitize fed values
    local effectToCheck  = utils.defaultIfNil(effectId, 0)
    local elementToCheck = utils.defaultIfNil(actionElement, 0)

    -- Sleep exception.
    if
        effectToCheck == xi.effect.SLEEP_I and
        elementToCheck == xi.element.LIGHT
    then
        return xi.immunity.LIGHT_SLEEP
    end

    -- Fetch immunity from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.EFFECT_IMMUNITY]
    end

    return 0
end

xi.data.statusEffect.getAssociatedResistTraitModifier = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch modifier ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.MOD_RESIST_TRAIT]
    end

    return 0
end

xi.data.statusEffect.getAssociatedResistanceRankModifier = function(effectId, actionElement)
    -- Sanitize fed value
    local effectToCheck  = utils.defaultIfNil(effectId, 0)
    local elementToCheck = utils.defaultIfNil(actionElement, 0)

    -- Sleep exception.
    if
        effectToCheck == xi.effect.SLEEP_I and
        elementToCheck == xi.element.LIGHT
    then
        return xi.mod.LIGHT_SLEEP_RES_RANK
    end

    -- Fetch modifier ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.MOD_RESIST_RANK]
    end

    return 0
end

xi.data.statusEffect.getAssociatedMagicEvasionModifier = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch modifier ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.MOD_MAGIC_EVASION]
    end

    return 0
end

xi.data.statusEffect.getAssociatedImmunobreakModifier = function(effectId)
    -- Sanitize fed value
    local effectToCheck = utils.defaultIfNil(effectId, 0)

    -- Fetch modifier ID from table if entry exists.
    if xi.data.statusEffect.dataTable[effectToCheck] then
        return xi.data.statusEffect.dataTable[effectToCheck][column.MOD_IMMUNOBREAK]
    end

    return 0
end

-----------------------------------
-- Helper functions to check target effect nullification.
-----------------------------------
xi.data.statusEffect.isResistRateSuccessfull = function(effectId, resistRate, resistRateBypass)
    local allowedResistState = resistRateBypass > 0 and resistRateBypass or xi.data.statusEffect.getLastAllowedResistanceState(effectId)
    if resistRate >= 1 / 2 ^ allowedResistState then
        return true
    end

    return false
end

xi.data.statusEffect.isTargetImmune = function(target, effectId, actionElement)
    if not target:isMob() then
        return false
    end

    local immunityId = xi.data.statusEffect.getAssociatedImmunity(effectId, actionElement)
    if
        immunityId > 0 and
        target:hasImmunity(immunityId)
    then
        return true
    end

    return false
end

xi.data.statusEffect.isTargetResistant = function(actor, target, effectId)
    local modifierId = xi.data.statusEffect.getAssociatedResistTraitModifier(effectId)
    if modifierId == 0 then
        return false
    end

    local resistancePower = target:getMod(modifierId) + target:getMod(xi.mod.STATUSRES) + 5
    if resistancePower <= 5 then
        return false
    end

    -- TODO: Investigate if this happens always or not. Ex: Terror.
    if actor:isNM() then
        resistancePower = math.floor(resistancePower / 2)
    end

    if math.randomInt(1, 100) <= resistancePower then
        return true
    end

    return false
end

xi.data.statusEffect.isEffectNullified = function(target, effectId, effectTier)
    -- Check effects that always block current effect from being applied.
    local nullificatingEffect = xi.data.statusEffect.getNullificatingEffect(effectId)
    if
        nullificatingEffect > 0 and
        target:hasStatusEffect(nullificatingEffect)
    then
        return true
    end

    if effectTier == 0 then
        return false
    end

    -- Check if current effect is in place with a higher tier.
    if target:hasStatusEffect(effectId) then
        if target:getStatusEffect(effectId):getTier() >= effectTier then
            return true
        end
    end

    -- Check effects that can block current effect from being applied, based on tier.
    local tierNullificatingEffect = xi.data.statusEffect.getNullificatingEffectByTier(effectId)
    if
        tierNullificatingEffect > 0 and
        target:hasStatusEffect(tierNullificatingEffect)
    then
        if target:getStatusEffect(tierNullificatingEffect):getTier() >= effectTier then
            return true
        end
    end

    return false
end