--[[
--  Handles random Dvaered Patrol missions.
--
--  Stage 1: Travelling.
--  Stage 2: Must clear enemies.
--  Stage 3: Continue travelling.
--]]

lang = lephisto.lang()
if lang == "es" then
  -- Not translated atm.
else -- Default English.
  misn_desc     = {}
  misn_desc[1]  = "Patrol %d systems for hostiles: "
  misn_desc[2]  = "Travel to the %s system and check for hostiles."
  misn_desc[3]  = "Return to %s in the %s system for payment."
  misn_reward   = "%d credits"
  title         = {}
  title[1]      = "DV: Routine %d sector patrol"
  title[2]      = "DV: Patrol %d sectors"
  title[3]      = "DV: Scan of %d sectors"
  accpet_title  = "Mission Accepted"
  msg_title     = {}
  msg_msg       = {}
  msg_title[1]  = "Mission Success"
  msg_msg[1]    = "You are greeted by a Dvaered official and recieve your payment of %d credits for your contribution in keeping Dvaered systems clean."
  msg_msg[2]    = "DV: Engage hostiles."
  msg_msg[3]    = "MISSION FAILED: Fled from the heat of battle."
  msg_msg[5]    = "DV: Patrol finished, return to base."
end

-- Create the mission.
function create()
  -- Get systems to patrol.
  num_systems = rnd.int(2, 4)
  systems = {}
  s = space.getSystem():adjacentSystems()
  systems[1] = s[rnd.int(1, #s)]
  for i = 2, num_systems do
    s = systems[i-1]:adjacentSystems()
    systems[i] = s[rnd.int(1, #s)]
  end
  system1, system2, system3, system4 = unpack(systems)
  base, base_sys = space_getPlanet()
  misn_setMarker(systems[1])

  -- Create the description.
  desc = string.format(misn_desc[1], num_systems) .. systems[1]:name()
  for i = 2, num_systems-1 do
    desc = desc ..", " .. systems[i]:name()
  end
  desc = desc .. " and " .. systems[num_systems]:name() .. "."

  -- Set mission stage.
  misn_stage  = 1
  visited     = 0

  -- Calculate reward.
  reward = 10000
  for i = 1, num_systems do
    reward = reward + 15000 + 5000 * rnd.twosigma()
  end

  -- Set some details.
  misn.setTitle(string.format(title[rnd.int(1, 3)], num_systems))
  misn.setDesc(desc)
  misn_setReward(string.format(misn_reward, reward))
end

-- Mission is accepted.
function accept()
  if misn.accept() then

    -- Update the description.
    misn.setDesc(string.format(misn_desc[2], systems[1]:name()))

    -- Set the hooks.
    hook.land("land")
    hook.enter("jump")
  end
end

-- Jump hook.
function jump()
  if misn_stage == 1 then
    sys = space.getSystem()

    -- Hack in case it wasn't saved.
    if systems == nil then
      systems = { system1, system2, system3, system4 }
    end

    -- Check to see if system is next.
    if sys == systems[visited+1] then
      visited = visited + 1

      -- Get the next goal.
      setNextGoal()
    end
  elseif misn_stage == 3 then
    player.msg(msg_msg[3])
    misn.finish(false)
  end
end

-- Set the next goal.
function setNextGoal()
  -- Check to see if there are enemies.
  f = faction.get("Dvaered")
  enemies = pilot.get(f:enemies())
  hostiles = #enemies
  if hostiles > 0 then
    misn_stage = 3

    -- Set hooks.
    for k,v in ipairs(enemies) do
      v:setHostile() -- Should be hostile to player.
      hook.pilot(v, "disable", "death")
      hook.pilot(v, "jump", "death")
    end

    -- Update description and send messages.
    player.msg(msg_msg[2])
    misn.setDesc(string.format(misn_desc[4], sys:name()))

  -- No hostiles, continue route.
  else
    -- Finished visiting systems.
    if visited >= #systems then
      misn_stage = 2
      player.msg(msg_msg[5])
      misn.setDesc(string.format(misn_desc[3], base:name(), base_sys:name()))
      misn.setMarker(base_sys)

    -- Need to visit more systems.
    else
      player.msg(msg_msg[4])
      misn.setDesc(string.format(misn_desc[2], systems[visited+1]:name()))
      misn.setMarker(systems[visited+1])
    end
  end
end

-- Pilot death hook.
function death()
  hostiles = hostiles - 1
  if hostiles <= 0 then
    misn_stage = 1
    setNextGoal()
  end
end

-- land hook.
function land()
  landed = space.getPlanet()
  if misn_stage == 2 and landed == base then
    player.pay(reward)
    tk.msg(msg_title[1], string.format(msg_msg[1], reward))

    -- Modify the faction standing.
    if player.getFaction("Dvaered") < 70 then
      player.modFaction("Dvaered", rnd.rnd(1, num_systems/2));
    end

    misn.finish(true)
  end
end