-- Run this explicitly through -*- Lua -*-

-- Copyright 2017 Daniel Silverstone <dsilvers@digital-scurf.org>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
--    notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
--    documentation and/or other materials provided with the distribution.
-- 3. Neither the name of the author nor the names of their contributors
--    may be used to endorse or promote products derived from this software
--    without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.

local infiles = {...}

local stats = require("luacov.stats")

local instpfx = assert(io.popen("pwd", "r")):read("*l")
if instpfx:sub(-1) ~= "/" then instpfx = instpfx .. "/" end
instpfx = instpfx .. "testing/inst/"

local inst_prefix_map = {
   { "etc/gitano/plugins/", "plugins/" },
   { "lib/gitano/plugins/", "plugins/" },
   { "lib/gitano/bin/../../../bin/", "bin/", ".in" },
   { "lib/gitano/bin/", "bin/", ".in" },
   { "share/lua/5.1/", "lib/" },
}

local noninst_prefix_map = {
   { "hooks/", "bin/gitano-", "-hook.in" },
}

local function remap_prefixes(fname, map)
   for _, mapentry in ipairs(map) do
      local pfx, replace, suffix = mapentry[1], mapentry[2], mapentry[3]
      if fname:sub(1, #pfx) == pfx then
         fname = replace .. fname:sub(#pfx+1, -1)
         if suffix then
            fname = fname .. suffix
         end
      end
   end
   return fname
end

local function remap_fname(fname)
   if fname:sub(1, #instpfx) ~= instpfx then
      return remap_prefixes(fname, noninst_prefix_map)
   end
   fname = fname:sub(#instpfx+1, -1)
   return remap_prefixes(fname, inst_prefix_map)
end

-- Step 1, merge all the coverage files together into a single one...

local merged = {}

function merge_data(fname)
   local subdata = stats.load(fname)
   for fname, fdat in pairs(subdata) do
      fname = remap_fname(fname)
      if not merged[fname] then
         merged[fname] = fdat
      else
         for i = 1, fdat.max do
            merged[fname][i] = (merged[fname][i] or 0) + (fdat[i] or 0)
         end
      end
   end
end

local percent = 0
for i = 1, #infiles do
   merge_data(infiles[i])
   local newpercent = math.floor((i*100) / #infiles)
   if (newpercent - percent > 0) or (newpercent == 100) then
      io.stdout:write(("COVERAGE: %3d%% merged.\r"):format(newpercent))
      percent = newpercent
      io.stdout:flush();
   end
end
io.stdout:write("\n");

-- Step 2, write it all out

print("Saving merged stats")
stats.save("luacov.stats.out", merged)