-- See Copyright Notice in the file LICENSE

local luatest = require "luatest"
local N = luatest.NT
local unpack = unpack or table.unpack

local function norm(a) return a==nil and N or a end

local function fill (n, m)
  local t = {}
  for i = n, m, -1 do table.insert (t, i) end
  return t
end

local function set_named_subpatterns (lib, flg)
  return {
    Name = "Named Subpatterns",
    Func = function (subj, methodname, patt, name1, name2)
      local r = lib.new (patt)
      local _,_,caps = r[methodname] (r, subj)
      return norm(caps[name1]), norm(caps[name2])
    end,
    --{} N.B. subject is always first element
    { {"abcd", "tfind", "(?P<dog>.)b.(?P<cat>d)", "dog", "cat"},  {"a","d"} },
    { {"abcd", "exec",  "(?P<dog>.)b.(?P<cat>d)", "dog", "cat"},  {"a","d"} },
  }
end

local function set_f_find (lib, flg)
  local cp1251 =
    "ÀÁÂÃÄŨÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäå¸æçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
  local loc = "Russian_Russia.1251"
  return {
  Name = "Function find",
  Func = lib.find,
  --{subj,   patt,      st,cf,ef,lo},        { results }
  { {"abcd", ".+",      5},                  { N   } }, -- failing st
  { {"abcd", ".*?"},                         { 1,0 } }, -- non-greedy
  { {"abc",  "aBC",     N,flg.CASELESS},     { 1,3 } }, -- cf
  { {"abc",  "aBC",     N,"i"         },     { 1,3 } }, -- cf
  { {"abc",  "bc",      N,flg.ANCHORED},     { N   } }, -- cf
  { {"abc",  "bc",      N,N,flg.ANCHORED},   { N   } }, -- ef
--{ {cp1251, "[[:upper:]]+", N,N,N, loc},    { 1,33} }, -- locale
--{ {cp1251, "[[:lower:]]+", N,N,N, loc},    {34,66} }, -- locale
}
end

local function set_f_match (lib, flg)
  return {
  Name = "Function match",
  Func = lib.match,
  --{subj,   patt,      st,cf,ef,lo},        { results }
  { {"abcd", ".+",      5},                  { N    }}, -- failing st
  { {"abcd", ".*?"},                         { ""   }}, -- non-greedy
  { {"abc",  "aBC",     N,flg.CASELESS},     {"abc" }}, -- cf
  { {"abc",  "aBC",     N,"i"         },     {"abc" }}, -- cf
  { {"abc",  "bc",      N,flg.ANCHORED},     { N    }}, -- cf
  { {"abc",  "bc",      N,N,flg.ANCHORED},   { N    }}, -- ef
}
end

local function set_f_gmatch (lib, flg)
  -- gmatch (s, p, [cf], [ef])
  local pCSV = "[^,]*"
  local F = false
  local function test_gmatch (subj, patt)
    local out, guard = {}, 10
    for a, b in lib.gmatch (subj, patt) do
      table.insert (out, { norm(a), norm(b) })
      guard = guard - 1
      if guard == 0 then break end
    end
    return unpack (out)
  end
  return {
    Name = "Function gmatch",
    Func = test_gmatch,
  --{  subj             patt    results }
    { {"a\0c",          "." },  {{"a",N},{"\0",N},{"c",N}} },--nuls in subj
    { {"",              pCSV},  {{"",N}} },
    { {"12",            pCSV},  {{"12",N}} },
    { {",",             pCSV},  {{"", N},{"", N}} },
    { {"12,,45",        pCSV},  {{"12",N},{"",N},{"45",N}} },
    { {",,12,45,,ab,",  pCSV},  {{"",N},{"",N},{"12",N},{"45",N},{"",N},{"ab",N},{"",N}} },
    { {"12345",     "(.)(.)"},  {{"1","2"},{"3","4"}} },
    { {"12345",     "(.)(.?)"}, {{"1","2"},{"3","4"},{"5",""}} },
  }
end

local function set_f_split (lib, flg)
  -- split (s, p, [cf], [ef])
  local function test_split (subj, patt)
    local out, guard = {}, 10
    for a, b, c in lib.split (subj, patt) do
      table.insert (out, { norm(a), norm(b), norm(c) })
      guard = guard - 1
      if guard == 0 then break end
    end
    return unpack (out)
  end
  return {
    Name = "Function split",
    Func = test_split,
  --{  subj             patt      results }
    { {"a,\0,c",       ","},     {{"a",",",N},{"\0",",",N},{"c",N,N},   } },--nuls in subj
    { {"ab",           "$"},     {{"ab","",N}, {"",N,N}                } },
    { {"ab",         "^|$"},     {{"", "", N}, {"ab","",N}, {"",N,N}   } },
    { {"ab45ab","(?<=ab).*?"},   {{"ab","",N}, {"45ab","",N}, {"",N,N} } },
    { {"ab",         "\\b"},     {{"", "", N}, {"ab","",N}, {"",N,N}   } },
    { {"ab",         ".*" },     {{"","ab",N}, {"",N,N}                } },
    { {"ab",         ".*?" },    {{"","",N}, {"a","",N}, {"b","",N}, {"",N,N} } },
    { {"ab;de",      ";*" },     {{"","",N},{"a","",N},{"b",";",N},{"d","",N},{"e","",N},{"",N,N} }},
  }
end

local function set_m_exec (lib, flg)
  return {
  Name = "Method exec",
  Method = "exec",
--{patt,cf,lo},           {subj,st,ef}              { results }
  { {".+"},               {"abcd",5},               { N }    }, -- failing st
  { {".*?"},              {"abcd"},                 {1,0,{}} }, -- non-greedy
  { {"aBC",flg.CASELESS}, {"abc"},                  {1,3,{}} }, -- cf
  { {"aBC","i"         }, {"abc"},                  {1,3,{}} }, -- cf
  { {"bc",flg.ANCHORED},  {"abc"},                  { N }    }, -- cf
  { {"bc"},               {"abc",N, flg.ANCHORED},  { N }    }, -- ef
}
end

local function set_m_tfind (lib, flg)
  return {
  Name = "Method tfind",
  Method = "tfind",
--{patt,cf,lo},           {subj,st,ef}              { results }
  { {".+"},               {"abcd",5},               { N }    }, -- failing st
  { {".*?"},              {"abcd"},                 {1,0,{}} }, -- non-greedy
  { {"aBC",flg.CASELESS}, {"abc"},                  {1,3,{}} }, -- cf
  { {"aBC","i"         }, {"abc"},                  {1,3,{}} }, -- cf
  { {"bc",flg.ANCHORED},  {"abc"},                  { N }    }, -- cf
  { {"bc"},               {"abc",N, flg.ANCHORED},  { N }    }, -- ef
}
end

local function set_m_dfa_exec (lib, flg)
  local ver = tonumber(lib.version():match("%d+%.%d+"))
  local NAP = ver < 8.34 and "" or "(*NO_AUTO_POSSESS)"
  local flag_partial = ver < 10.0 and flg.PARTIAL or flg.PARTIAL_SOFT
  return {
  Name = "Method dfa_exec",
  Method = "dfa_exec",
--{patt,cf,lo},           {subj,st,ef,os,ws}        { results }
  { {NAP..".+"},          {"abcd"},                 {1,{4,3,2,1},4} }, -- [none]
  { {NAP..".+"},          {"abcd",2},               {2,{4,3,2},  3} }, -- positive st
  { {NAP..".+"},          {"abcd",-2},              {3,{4,3},    2} }, -- negative st
  { {".+"},               {"abcd",5},               {N }            }, -- failing st
  { {NAP..".*"},          {"abcd"},                 {1,{4,3,2,1,0},5}}, -- [none]
  { {".*?"},              {"abcd"},                 {1,{4,3,2,1,0},5}}, -- non-greedy
  { {"aBC",flg.CASELESS}, {"abc"},                  {1,{3},1}  }, -- cf
  { {"aBC","i"         }, {"abc"},                  {1,{3},1}  }, -- cf
  { {"bc"},               {"abc"},                  {2,{3},1}  }, -- [none]
  { {"bc",flg.ANCHORED},  {"abc"},                  {N }       }, -- cf
  { {"bc"},               {"abc",N, flg.ANCHORED},  {N }       }, -- ef
  { { "(.)b.(d)"},        {"abcd"},                 {1,{4},1}  }, --[captures]
  { {"abc"},              {"ab"},                   {N }       },
  { {"abc"},              {"ab",N,flag_partial},    {1,{2},flg.ERROR_PARTIAL} },
  { {NAP..".+"}, {string.rep("a",50),N,N,50,50},    {1, fill(50,26), 0}},-- small ovecsize
}
end

local function set_m_fullinfo (lib, flg)
  local r = lib.new("(foo)(bar)")
  local info = r:fullinfo()
  assert(info.CAPTURECOUNT == 2)
end

return function (libname)
  local lib = require (libname)
  local flags = lib.flags ()
  local sets = {
    set_f_match  (lib, flags),
    set_f_find   (lib, flags),
    set_f_gmatch (lib, flags),
    set_f_split  (lib, flags),
    set_m_exec   (lib, flags),
    set_m_tfind  (lib, flags),
    set_m_fullinfo (lib, flags),
  }
  if flags.MAJOR >= 4 then
    table.insert (sets, set_named_subpatterns (lib, flags))
  end
  if flags.MAJOR >= 6 then
    table.insert (sets, set_m_dfa_exec (lib, flags))
  end
  return sets
end