-- Frontmatter edit surface (tech-spec §8.3): a node buffer opens with an
-- editable YAML block on top, and saving routes each changed field to the right
-- structured RPC (rename / set_attention / set_schedule / set_project /
-- tag.add). The body itself still round-trips through node.update.

local h = require("e2e.helpers")

-- Replace `key: …` in the frontmatter `lines`, or insert it before the closing
-- `---` fence when the key isn't present yet.
local function set_field(lines, key, value)
  for i, line in ipairs(lines) do
    if line:match("^" .. key .. ":") then
      lines[i] = key .. ": " .. value
      return
    end
  end
  local fences = 0
  for i, line in ipairs(lines) do
    if line == "---" then
      fences = fences + 1
      if fences == 2 then
        table.insert(lines, i, key .. ": " .. value)
        return
      end
    end
  end
end

describe("frontmatter edit surface", function()
  local ctx
  before_each(function()
    ctx = h.start()
  end)
  after_each(function()
    h.stop(ctx)
  end)

  it("renders an editable block atop a node body", function()
    local doc = h.create_doc("Roof", "# Roof\n\nnotes")
    local buf = h.open(doc.id)
    local first = vim.api.nvim_buf_get_lines(buf, 0, 1, false)[1]
    assert.are.equal("---", first, "buffer should open with a frontmatter fence")
    assert.is_truthy(h.find(buf, "^title: Roof"), "title not in frontmatter")
    assert.is_truthy(h.find(buf, "# Roof"), "body content missing below frontmatter")
  end)

  it("routes frontmatter edits to structured RPCs on save", function()
    local proj = ctx.q:call("node.create", { kind = "project", title = "Camano" })
    local task = ctx.q:call("task.create", { title = "Fix roof", attention = "red" })
    local ctxid
    for _, l in ipairs(ctx.q:call("links.outgoing", { id = task.node_id })) do
      if l.link_type == "canonical-context" then
        ctxid = l.dst_id
      end
    end

    local buf = h.open(ctxid)
    local lines = vim.api.nvim_buf_get_lines(buf, 0, -1, false)
    set_field(lines, "title", "Fix the roof") -- rename the (doc) node
    set_field(lines, "attention", "blue") -- → task.set_attention
    set_field(lines, "tags", "[roofing]") -- → tag.add on the doc
    set_field(lines, "project", "Camano") -- → task.set_project
    set_field(lines, "do_date", "2026-06-10") -- → task.set_schedule
    vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
    h.save(buf)

    -- The task picked up attention, project, and a do-date.
    local t = ctx.q:call("task.get", { id = task.node_id })
    assert.are.equal("blue", t.attention)
    assert.is_truthy(t.do_date, "do_date should be set")
    local filed = false
    for _, l in ipairs(ctx.q:call("links.outgoing", { id = task.node_id })) do
      if l.link_type == "in-project" and l.dst_id == proj.id then
        filed = true
      end
    end
    assert.is_true(filed, "task should be filed under Camano")

    -- The opened node was renamed and tagged.
    assert.are.equal("Fix the roof", ctx.q:call("node.get", { id = ctxid }).title)
    local tags = ctx.q:call("tag.list", { node_id = ctxid })
    assert.are.equal(1, #tags)
    assert.are.equal("roofing", tags[1])
  end)
end)