local runner = require("test-samurai-go-runner")

describe("test-samurai-go-runner", function()
  it("detects Go test files by suffix", function()
    local bufnr1 = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_buf_set_name(bufnr1, "/tmp/go_suffix_test.go")
    assert.is_true(runner.is_test_file(bufnr1))

    local bufnr2 = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_buf_set_name(bufnr2, "/tmp/go_main.go")
    assert.is_false(runner.is_test_file(bufnr2))
  end)

  it("finds subtest when cursor is inside t.Run block", function()
    local bufnr = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_buf_set_name(bufnr, "/tmp/go_subtest_test.go")
    local lines = {
      "package main",
      "import \"testing\"",
      "",
      "func TestFoo(t *testing.T) {",
      "    t.Run(\"first\", func(t *testing.T) {",
      "        -- inside first",
      "    })",
      "",
      "    t.Run(\"second\", func(t *testing.T) {",
      "        -- inside second",
      "    })",
      "}",
    }
    vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)

    local orig_fs_find = vim.fs.find
    vim.fs.find = function(_, _)
      return { "/tmp/go.mod" }
    end

    local row_inside_first = 5
    local spec, err = runner.find_nearest(bufnr, row_inside_first, 0)

    vim.fs.find = orig_fs_find

    assert.is_nil(err)
    assert.is_not_nil(spec)
    assert.equals("TestFoo/first", spec.test_path)
    assert.equals("subtest", spec.scope)
    assert.is_true(spec.file:match("go_subtest_test%.go$") ~= nil)
    assert.is_true(spec.cwd:match("/tmp$") ~= nil)
  end)

  it("falls back to whole test function when between subtests", function()
    local bufnr = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_buf_set_name(bufnr, "/tmp/go_between_test.go")
    local lines = {
      "package main",
      "import \"testing\"",
      "",
      "func TestFoo(t *testing.T) {",
      "    t.Run(\"first\", func(t *testing.T) {",
      "        -- inside first",
      "    })",
      "",
      "    t.Run(\"second\", func(t *testing.T) {",
      "        -- inside second",
      "    })",
      "}",
    }
    vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)

    local orig_fs_find = vim.fs.find
    vim.fs.find = function(_, _)
      return { "/tmp/go.mod" }
    end

    local row_between = 7
    local spec, err = runner.find_nearest(bufnr, row_between, 0)

    vim.fs.find = orig_fs_find

    assert.is_nil(err)
    assert.is_not_nil(spec)
    assert.equals("TestFoo", spec.test_path)
    assert.equals("function", spec.scope)
    assert.is_true(spec.file:match("go_between_test%.go$") ~= nil)
    assert.is_true(spec.cwd:match("/tmp$") ~= nil)
  end)

  it("build_command uses current package and correct run pattern", function()
    local spec_sub = {
      file = "/tmp/project/pkg/foo_test.go",
      cwd = "/tmp/project",
      test_path = "TestFoo/first",
      scope = "subtest",
    }

    local cmd_spec_sub = runner.build_command(spec_sub)
    assert.are.same(
      { "go", "test", "-json", "-v", "./pkg", "-run", "^TestFoo$/^first$" },
      cmd_spec_sub.cmd
    )

    local spec_func = {
      file = "/tmp/project/foo_test.go",
      cwd = "/tmp/project",
      test_path = "TestFoo",
      scope = "function",
    }

    local cmd_spec_func = runner.build_command(spec_func)
    assert.are.same(
      { "go", "test", "-json", "-v", "./", "-run", "^TestFoo$" },
      cmd_spec_func.cmd
    )
  end)

  it("build_file_command uses exact test names from current file", function()
    local bufnr = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_buf_set_name(bufnr, "/tmp/project/get_test.go")
    local lines = {
      "package main",
      "import \"testing\"",
      "",
      "func TestHandleGet(t *testing.T) {",
      "  t.Run(\"returns_200\", func(t *testing.T) {",
      "    -- inside test",
      "  })",
      "}",
    }
    vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)

    local orig_fs_find = vim.fs.find
    vim.fs.find = function(_, _)
      return { "/tmp/project/go.mod" }
    end

    local cmd_spec = runner.build_file_command(bufnr)

    vim.fs.find = orig_fs_find

    assert.are.same(
      { "go", "test", "-json", "-v", "./", "-run", "^(TestHandleGet)$" },
      cmd_spec.cmd
    )
    assert.equals("/tmp/project", cmd_spec.cwd)
  end)

  it("parse_results reports subtests and display names", function()
    local output = table.concat({
      vim.json.encode({ Action = "run", Test = "TestFoo" }),
      vim.json.encode({ Action = "pass", Test = "TestFoo/first" }),
      vim.json.encode({ Action = "fail", Test = "TestFoo/second" }),
      vim.json.encode({ Action = "skip", Test = "TestFoo/third" }),
    }, "\n")

    local results = runner.parse_results(output)
    assert.are.same({ "TestFoo/first" }, results.passes)
    assert.are.same({ "TestFoo/second" }, results.failures)
    assert.are.same({ "TestFoo/third" }, results.skips)
    assert.are.same({ "TestFoo/first" }, results.display.passes)
    assert.are.same({ "TestFoo/second" }, results.display.failures)
    assert.are.same({ "TestFoo/third" }, results.display.skips)
  end)

  it("orders parent tests before subtests within each status", function()
    local output = table.concat({
      vim.json.encode({ Action = "fail", Test = "TestHandleGet/returns_200" }),
      vim.json.encode({ Action = "fail", Test = "TestHandleGet" }),
      vim.json.encode({ Action = "pass", Test = "TestOther/alpha" }),
      vim.json.encode({ Action = "pass", Test = "TestOther" }),
    }, "\n")

    local results = runner.parse_results(output)
    assert.are.same({ "TestHandleGet", "TestHandleGet/returns_200" }, results.failures)
    assert.are.same({ "TestOther", "TestOther/alpha" }, results.passes)
    assert.are.same({ "TestHandleGet", "TestHandleGet/returns_200" }, results.display.failures)
    assert.are.same({ "TestOther", "TestOther/alpha" }, results.display.passes)
  end)

  it("parse_test_output groups output per test", function()
    local output = table.concat({
      vim.json.encode({ Action = "output", Test = "TestFoo", Output = "line1\n" }),
      vim.json.encode({ Action = "output", Test = "TestFoo", Output = "line2\n" }),
      vim.json.encode({ Action = "output", Test = "TestFoo/first", Output = "sub1\n" }),
    }, "\n")

    local results = runner.parse_test_output(output)
    assert.are.same({ "line1", "line2" }, results["TestFoo"])
    assert.are.same({ "sub1" }, results["TestFoo/first"])
  end)

  it("build_failed_command narrows to failed tests", function()
    local last_command = {
      cmd = { "go", "test", "-json", "-v", "./", "-run", "^TestFoo($|/)" },
      cwd = "/tmp/project",
    }
    local failures = { "TestFoo/first", "TestBar" }

    local cmd_spec = runner.build_failed_command(last_command, failures, "file")
    assert.are.same(
      { "go", "test", "-json", "-v", "./", "-run", "(^TestFoo$/^first$|^TestBar$)" },
      cmd_spec.cmd
    )
  end)

  it("collect_failed_locations finds subtest positions", function()
    local temp_dir = vim.fn.tempname()
    vim.fn.mkdir(temp_dir, "p")
    local file = temp_dir .. "/sample_test.go"
    local lines = {
      "package main",
      "import \"testing\"",
      "",
      "func TestFoo(t *testing.T) {",
      "  t.Run(\"first\", func(t *testing.T) {",
      "    -- inside test",
      "  })",
      "}",
    }
    vim.fn.writefile(lines, file)

    local items = runner.collect_failed_locations({ "TestFoo/first" }, { cwd = temp_dir }, "all")
    assert.is_true(#items > 0)
    assert.equals(file, items[1].filename)
    assert.equals(5, items[1].lnum)
  end)
end)