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<link rel="stylesheet" href="../../../coverage.css"/> <title> the_great_game/merchants/strategies/simple.clj </title>
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<span class="covered" title="1 out of 1 forms covered">
001 (ns the-great-game.merchants.strategies.simple
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002 "Default trading strategy for merchants.
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003
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004 The simple strategy buys a single product in the local market if there is
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005 one which can be traded profitably, trades it to the chosen target market,
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006 and sells it there. If there is no commodity locally which can be traded
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007 profitably, moves towards home with no cargo. If at home and no commodity
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008 can be traded profitably, does not move."
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009 (:require [taoensso.timbre :as l :refer [info error spy]]
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010 [the-great-game.utils :refer [deep-merge]]
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011 [the-great-game.gossip.gossip :refer [move-gossip]]
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012 [the-great-game.merchants.planning :refer :all]
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013 [the-great-game.merchants.merchant-utils :refer
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014 [add-stock add-known-prices]]
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015 [the-great-game.world.routes :refer [find-route]]))
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016
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017 (defn plan-and-buy
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018 "Return a world like this `world`, in which this `merchant` has planned
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019 a new trade, and bought appropriate stock for it. If no profitable trade
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020 can be planned, the merchant is simply moved towards their home."
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021 [merchant world]
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022 (let [m (cond
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023 (keyword? merchant)
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<span class="not-covered" title="0 out of 5 forms covered">
024 (-> world :merchants merchant)
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025 (map? merchant)
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026 merchant)
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<span class="not-covered" title="0 out of 3 forms covered">
027 id (:id m)
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028 location (:location m)
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029 market (-> world :cities location)
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030 plan (select-cargo merchant world)]
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031 (l/debug "plan-and-buy: merchant" id)
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032 (cond
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033 (not (empty? plan))
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034 (let
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035 [c (:commodity plan)
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036 p (* (:quantity plan) (:buy-price plan))
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037 q (:quantity plan)]
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038 (l/info "Merchant" id "bought" q "units of" c "at" location "for" p plan)
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039 {:merchants
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040 {id
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<span class="not-covered" title="0 out of 13 forms covered">
041 {:stock (add-stock (:stock m) {c q})
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<span class="not-covered" title="0 out of 6 forms covered">
042 :cash (- (:cash m) p)
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<span class="not-covered" title="0 out of 4 forms covered">
043 :known-prices (add-known-prices m world)
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<span class="not-covered" title="0 out of 1 forms covered">
044 :plan plan}}
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045 :cities
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046 {location
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047 {:stock (assoc (:stock market) c (- (-> market :stock c) q))
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<span class="not-covered" title="0 out of 6 forms covered">
048 :cash (+ (:cash market) p)}}})
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049 ;; if no plan, then if at home stay put
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050 (= (:location m) (:home m))
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051 (do
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052 (l/info "Merchant" id "remains at home in" location)
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053 {})
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054 ;; else move towards home
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055 :else
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056 (let [route (find-route world location (:home m))
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057 next-location (nth route 1)]
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058 (l/info "No trade possible at" location "; merchant" id "moves to" next-location)
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059 (merge
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060 {:merchants
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061 {id
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062 {:location next-location}}}
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063 (move-gossip id world next-location))))))
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064
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065 (defn re-plan
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066 "Having failed to sell a cargo at current location, re-plan a route to
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067 sell the current cargo. Returns a revised world."
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068 [merchant world]
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069 (let [m (cond
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070 (keyword? merchant)
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071 (-> world :merchants merchant)
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072 (map? merchant)
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073 merchant)
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074 id (:id m)
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075 location (:location m)
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076 plan (augment-plan m world (plan-trade m world (-> m :plan :commodity)))]
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077 (l/debug "re-plan: merchant" id)
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078 (deep-merge
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079 world
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080 {:merchants
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081 {id
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082 {:plan plan}}})))
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083
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084 (defn sell-and-buy
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085 "Return a new world like this `world`, in which this `merchant` has sold
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086 their current stock in their current location, and planned a new trade, and
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087 bought appropriate stock for it."
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088 ;; TODO: this either sells the entire cargo, or, if the market can't afford
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089 ;; it, none of it. And it does not cope with selling different commodities
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090 ;; in different markets.
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091 [merchant world]
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092 (let [m (cond
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093 (keyword? merchant)
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094 (-> world :merchants merchant)
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095 (map? merchant)
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096 merchant)
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097 id (:id m)
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098 location (:location m)
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099 market (-> world :cities location)
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100 stock-value (reduce
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101 +
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102 (map
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103 #(* (-> m :stock %) (-> market :prices m))
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104 (keys (:stock m))))]
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105 (l/debug "sell-and-buy: merchant" id)
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106 (if
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107 (>= (:cash market) stock-value)
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108 (do
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109 (l/info "Merchant" id "sells" (:stock m) "at" location "for" stock-value)
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110 (plan-and-buy
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111 merchant
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112 (deep-merge
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113 world
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114 {:merchants
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<span class="not-covered" title="0 out of 2 forms covered">
115 {id
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116 {:stock {}
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117 :cash (+ (:cash m) stock-value)
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<span class="not-covered" title="0 out of 4 forms covered">
118 :known-prices (add-known-prices m world)}}
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119 :cities
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120 {location
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121 {:stock (add-stock (:stock m) (:stock market))
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122 :cash (- (:cash market) stock-value)}}})))
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123 ;; else
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124 (re-plan merchant world))))
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125
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126 (defn move-merchant
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127 "Handle general en route movement of this `merchant` in this `world`;
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128 return a (partial or full) world like this `world` but in which the
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129 merchant may have been moved ot updated."
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130 [merchant world]
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131 (let [m (cond
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132 (keyword? merchant)
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133 (-> world :merchants merchant)
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134 (map? merchant)
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135 merchant)
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136 id (:id m)
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137 at-destination? (and (:plan m) (= (:location m) (-> m :plan :destination)))
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138 plan (:plan m)
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139 next-location (if plan
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140 (nth
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141 (find-route
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142 world
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143 (:location m)
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<span class="not-covered" title="0 out of 3 forms covered">
144 (:destination plan))
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145 1)
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146 (:location m))]
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147 (l/debug "move-merchant: merchant" id "at" (:location m)
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<span class="not-covered" title="0 out of 6 forms covered">
148 "destination" (-> m :plan :destination) "next" next-location
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<span class="not-covered" title="0 out of 1 forms covered">
149 "at destination" at-destination?)
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150 (cond
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151 ;; if the merchant is at the destination of their current plan
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152 ;; sell all cargo and repurchase.
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<span class="not-covered" title="0 out of 1 forms covered">
153 at-destination?
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154 (sell-and-buy merchant world)
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<span class="not-tracked" title="0 out of 0 forms covered">
155 ;; if they don't have a plan, seek to create one
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<span class="not-covered" title="0 out of 3 forms covered">
156 (nil? plan)
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<span class="not-covered" title="0 out of 4 forms covered">
157 (plan-and-buy merchant world)
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<span class="not-tracked" title="0 out of 0 forms covered">
158 ;; otherwise, move one step towards their destination
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<span class="not-covered" title="0 out of 11 forms covered">
159 (and next-location (not= next-location (:location m)))
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<span class="not-covered" title="0 out of 1 forms covered">
160 (do
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161 (l/info "Merchant " id " moving from " (:location m) " to " next-location)
</span><br/>
<span class="not-covered" title="0 out of 2 forms covered">
162 (deep-merge
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<span class="not-covered" title="0 out of 2 forms covered">
163 {:merchants
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<span class="not-covered" title="0 out of 2 forms covered">
164 {id
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<span class="not-covered" title="0 out of 4 forms covered">
165 {:location next-location
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166 :known-prices (add-known-prices m world)}}}
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<span class="not-covered" title="0 out of 5 forms covered">
167 (move-gossip id world next-location)))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
168 :else
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<span class="not-covered" title="0 out of 1 forms covered">
169 (do
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170 (l/info "Merchant" id "has plan but no next-location; currently at"
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<span class="not-covered" title="0 out of 6 forms covered">
171 (:location m) ", destination is" (:destination plan))
</span><br/>
<span class="not-covered" title="0 out of 1 forms covered">
172 world))))
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173
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