#!/usr/bin/env lua
-- zeta-cli — interactive recipe creation wizard for zeta-makepkg.
--
-- Walks through every recipe field with prompts, validation, and
-- smart defaults. Writes a ready-to-use .recipe file.

local here
if arg and arg[0] and arg[0]:match("[/\\]") then
  here = arg[0]:match("^(.*)[/\\][^/\\]*$")
elseif arg and arg[-1] then
  here = arg[-1]:match("^(.*)[/\\][^/\\]*$")
else
  here = "."
end
if here then
  local f = io.popen("cd " .. here:gsub("'", "'\\''") .. " 2>/dev/null && pwd")
  if f then local real = f:read("*l"); f:close(); if real and real ~= "" then here = real end end
end

-- Library path: works both from the repo tree (../lib/) and when installed
-- via 'make install' (/usr/local/lib/zeta-toolchain/).
package.path = here .. "/../lib/?.lua;"
  .. here .. "/../lib/zeta-toolchain/?.lua;"
  .. package.path

local recipe = require("recipe")
local path   = require("path")

---------------------------------------------------------------------------
-- Terminal helpers
---------------------------------------------------------------------------

local function bold(s)  return "\27[1m" .. s .. "\27[0m" end
local function dim(s)   return "\27[2m" .. s .. "\27[0m" end
local function green(s) return "\27[32m" .. s .. "\27[0m" end
local function red(s)   return "\27[31m" .. s .. "\27[0m" end
local function cyan(s)  return "\27[36m" .. s .. "\27[0m" end

local function prompt(label, default, validator)
  local suffix = ""
  if default and default ~= "" then
    suffix = dim(" [" .. default .. "]")
  end
  io.write(label .. suffix .. ": ")
  io.flush()
  local line = io.read("*l")
  if not line then
    io.write("\n")
    os.exit(0)
  end
  line = line:gsub("^%s+", ""):gsub("%s+$", "")
  if line == "" and default then line = default end
  if validator then
    local ok, err = validator(line)
    if not ok then
      io.write(red("  " .. err .. "\n"))
      return prompt(label, default, validator)
    end
  end
  return line
end

local function confirm(msg)
  io.write(msg .. " [Y/n] ")
  io.flush()
  local line = io.read("*l")
  if not line then io.write("\n"); os.exit(0) end
  line = line:gsub("^%s+", ""):gsub("%s+$", ""):lower()
  return line == "" or line == "y" or line == "yes"
end

local function choose(label, options)
  io.write(bold(label) .. "\n")
  for i, opt in ipairs(options) do
    io.write(string.format("  %d) %s\n", i, opt))
  end
  io.write("  Choice [1]: ")
  io.flush()
  local line = io.read("*l")
  if not line then io.write("\n"); os.exit(0) end
  line = line:gsub("^%s+", ""):gsub("%s+$", "")
  local n = tonumber(line)
  if not n or n < 1 or n > #options then n = 1 end
  return options[n]
end

---------------------------------------------------------------------------
-- Field validators
---------------------------------------------------------------------------

local function valid_name(name)
  if name == "" then return false, "name cannot be empty" end
  if not path.sanitize_name(name) then
    return false, "name must contain only alphanumeric characters, dots, underscores, plus, and hyphens"
  end
  return true
end

local function valid_version(v)
  if v == "" then return false, "version cannot be empty" end
  return true
end

local function valid_summary(s)
  if s == "" then return false, "summary cannot be empty" end
  return true
end

local function valid_url(u)
  if u == "" then return false, "url cannot be empty" end
  return true
end

local function valid_sha256(h)
  if h == "" then return true end  -- ok to skip
  if not h:lower():match("^" .. string.rep("%x", 64) .. "$") then
    return false, "sha256 must be exactly 64 hex characters (or press Enter to skip)"
  end
  return true
end

local function valid_jobs(j)
  if j == "" then return true end
  local n = tonumber(j)
  if not n or n < 1 or n % 1 ~= 0 then
    return false, "jobs must be a positive integer (or press Enter to skip)"
  end
  return true
end

---------------------------------------------------------------------------
-- Render the recipe as Lua source
---------------------------------------------------------------------------

local function render(rcp)
  local lines = { "return {" }
  local function e(s) return s:gsub('"', '\\"'):gsub("\n", "\\n") end

  lines[#lines + 1] = string.format('  name           = "%s",', e(rcp.name))
  lines[#lines + 1] = string.format('  version        = "%s",', e(rcp.version))
  lines[#lines + 1] = string.format('  summary        = "%s",', e(rcp.summary))
  lines[#lines + 1] = string.format('  url            = "%s",', e(rcp.url))

  if rcp.sha256 and rcp.sha256 ~= "" then
    lines[#lines + 1] = string.format('  sha256         = "%s",', rcp.sha256)
  else
    lines[#lines + 1] = "  sha256         = nil,"
  end

  if #rcp.deps > 0 then
    local d = {}
    for _, dep in ipairs(rcp.deps) do d[#d+1] = '"' .. e(dep) .. '"' end
    lines[#lines + 1] = string.format("  deps           = { %s },", table.concat(d, ", "))
  else
    lines[#lines + 1] = "  deps           = {},"
  end

  lines[#lines + 1] = string.format('  build_system   = "%s",', rcp.build_system)

  if rcp.configure_args and #rcp.configure_args > 0 then
    local a = {}
    for _, arg in ipairs(rcp.configure_args) do a[#a+1] = '"' .. e(arg) .. '"' end
    lines[#lines + 1] = string.format("  configure_args = { %s },", table.concat(a, ", "))
  end

  if rcp.build_system == "custom" then
    lines[#lines + 1] = string.format('  build_script   = "%s",', e(rcp.build_script or "build.sh"))
  end

  if rcp.test and rcp.test ~= "" then
    lines[#lines + 1] = string.format('  test           = "%s",', e(rcp.test):gsub("${DESTDIR}", "${DESTDIR}"))
  end

  if rcp.files and #rcp.files > 0 then
    local f = {}
    for _, file in ipairs(rcp.files) do f[#f+1] = '"' .. e(file) .. '"' end
    lines[#lines + 1] = string.format("  files          = { %s },", table.concat(f, ", "))
  end

  lines[#lines + 1] = "}"
  return table.concat(lines, "\n") .. "\n"
end

---------------------------------------------------------------------------
-- Wizard
---------------------------------------------------------------------------

local function wizard()
  io.write("\n")
  io.write(bold("  ═══ zeta-makepkg recipe wizard ═══") .. "\n\n")

  local rcp = {}

  -- 1. Name
  rcp.name = prompt("Package name", nil, valid_name)

  -- 2. Version
  rcp.version = prompt("Version", nil, valid_version)

  -- 3. Summary
  rcp.summary = prompt("Summary", nil, valid_summary)

  -- 4. URL
  rcp.url = prompt("Source URL", nil, valid_url)

  -- 5. SHA256
  rcp.sha256 = prompt("Source SHA256", "", valid_sha256)

  -- 6. Dependencies
  io.write("Dependencies" .. dim(" [comma-separated, e.g. libfoo, libbar>=2.0]") .. ": ")
  io.flush()
  local deps_line = io.read("*l")
  if not deps_line then io.write("\n"); os.exit(0) end
  deps_line = deps_line:gsub("^%s+", ""):gsub("%s+$", "")
  rcp.deps = {}
  if deps_line ~= "" then
    for raw in deps_line:gmatch("[^,]+") do
      local dep = raw:gsub("^%s+", ""):gsub("%s+$", "")
      if dep ~= "" then rcp.deps[#rcp.deps + 1] = dep end
    end
  end

  -- 7. Build system
  rcp.build_system = choose("Build system:", {
    "autotools  (./configure && make && make install)",
    "cmake      (cmake -B build && cmake --build && cmake --install)",
    "meson      (meson setup build && ninja && ninja install)",
    "make       (make && make install)",
    "cargo      (cargo build --release)",
    "custom     (run build_script)",
  })

  -- Map the selected string back to the key
  rcp.build_system = rcp.build_system:match("^(%S+)")

  -- 8. Configure args (skip for cargo)
  rcp.configure_args = {}
  if rcp.build_system ~= "cargo" then
    io.write("Configure args" .. dim(" [comma-separated, e.g. --enable-feature, --without-x]") .. ": ")
    io.flush()
    local args_line = io.read("*l")
    if not args_line then io.write("\n"); os.exit(0) end
    args_line = args_line:gsub("^%s+", ""):gsub("%s+$", "")
    if args_line ~= "" then
      for raw in args_line:gmatch("[^,]+") do
        local arg = raw:gsub("^%s+", ""):gsub("%s+$", "")
        if arg ~= "" then rcp.configure_args[#rcp.configure_args + 1] = arg end
      end
    end
  end

  -- 9. Build script (custom only)
  if rcp.build_system == "custom" then
    rcp.build_script = prompt("Build script path", "build.sh")
  end

  -- 10. Test command
  io.write("Test command" .. dim(" [${DESTDIR} = install staging dir, Enter to skip]") .. "\n")
  io.write("  Example: ${DESTDIR}/usr/bin/" .. rcp.name .. " --version\n")
  rcp.test = prompt("  Test", "")
  if rcp.test == "" then rcp.test = nil end

  -- 11. Files whitelist
  io.write("Files whitelist" .. dim(" [comma-separated relative paths, Enter = all files]") .. "\n")
  io.write("  Example: usr/bin/" .. rcp.name .. ", usr/lib/lib" .. rcp.name .. ".so\n")
  io.write("  Files: ")
  io.flush()
  local files_line = io.read("*l")
  if not files_line then io.write("\n"); os.exit(0) end
  files_line = files_line:gsub("^%s+", ""):gsub("%s+$", "")
  if files_line ~= "" then
    rcp.files = {}
    for raw in files_line:gmatch("[^,]+") do
      local file = raw:gsub("^%s+", ""):gsub("%s+$", ""):gsub("^/*", "")
      if file ~= "" then rcp.files[#rcp.files + 1] = file end
    end
  end

  -- 12. Preview
  io.write("\n")
  io.write(bold("  ═══ Preview ═══") .. "\n\n")
  io.write(render(rcp))
  io.write("\n")

  if not confirm("Write this recipe?") then
    io.write("Aborted.\n")
    os.exit(0)
  end

  -- 13. Output path
  local default_path = rcp.name .. ".recipe"
  local out_path = prompt("Save as", default_path)

  local f, err = io.open(out_path, "w")
  if not f then
    io.write(red("Error: ") .. tostring(err) .. "\n")
    os.exit(1)
  end
  f:write(render(rcp))
  f:close()

  -- Final validation pass
  local ok, verr = pcall(recipe.load, out_path)
  if not ok then
    io.write(red("Warning: generated recipe fails validation: ") .. tostring(verr) .. "\n")
  end

  io.write("\n" .. green("  recipe written to " .. out_path) .. "\n")
end

---------------------------------------------------------------------------
-- Main
---------------------------------------------------------------------------

local args = {}
for i = 1, #arg do args[i] = arg[i] end

local ok, err = pcall(wizard)
if not ok then
  io.write(red("Error: ") .. tostring(err) .. "\n")
  os.exit(1)
end