-- UI coordination module
local M = {}

local buffer_manager = require('notex.ui.buffer')
local view = require('notex.ui.view')
local editor = require('notex.ui.editor')
local query_engine = require('notex.query')
local utils = require('notex.utils')

-- UI state
local ui_state = {
  active_views = {},
  default_options = {
    max_width = 120,
    max_height = 30,
    show_help = true,
    border = "rounded"
  }
}

-- Show query results
function M.show_query_results(query_results, options)
  options = options or {}
  options = vim.tbl_deep_extend("force", ui_state.default_options, options)

  -- Validate query results
  if not query_results.success then
    M.show_error("Query Error", query_results.errors, options)
    return nil, query_results.errors
  end

  -- Create view
  local view_config = view.create_query_view(query_results, options)
  if not view_config then
    return nil, "Failed to create query view"
  end

  -- Store active view
  ui_state.active_views[view_config.buffer_id] = view_config

  -- Setup auto-cleanup
  M.setup_view_cleanup(view_config)

  utils.log("INFO", "Created query view", {
    buffer_id = view_config.buffer_id,
    document_count = #query_results.documents,
    view_type = options.view_type or "table"
  })

  return view_config
end

-- Show error message
function M.show_error(title, errors, options)
  options = options or {}

  local error_lines = {title, string.rep("=", #title), ""}

  if type(errors) == "string" then
    table.insert(error_lines, errors)
  elseif type(errors) == "table" then
    for _, error in ipairs(errors) do
      table.insert(error_lines, "• " .. error)
    end
  end

  table.insert(error_lines, "")
  table.insert(error_lines, "Press any key to close")

  local buffer = vim.api.nvim_create_buf(false, true)
  vim.api.nvim_buf_set_lines(buffer, 0, -1, false, error_lines)
  vim.api.nvim_buf_set_option(buffer, "filetype", "text")
  vim.api.nvim_buf_set_name(buffer, "notex://error")

  local window = vim.api.nvim_open_win(buffer, true, {
    relative = "editor",
    width = math.min(80, vim.api.nvim_get_option_value("columns", {})),
    height = math.min(20, vim.api.nvim_get_option_value("lines", {})),
    row = math.floor((vim.api.nvim_get_option_value("lines", {}) - 20) / 2),
    col = math.floor((vim.api.nvim_get_option_value("columns", {}) - 80) / 2),
    border = "rounded",
    style = "minimal",
    title = " Error "
  })

  -- Close on any key
  vim.api.nvim_create_autocmd("CursorMoved,WinLeave", {
    buffer = buffer,
    once = true,
    callback = function()
      vim.api.nvim_win_close(window, true)
    end
  })

  return {
    buffer_id = buffer,
    window_id = window,
    type = "error"
  }
end

-- Show document details
function M.show_document_details(document_id, options)
  options = options or {}

  -- Get document details
  local indexer = require('notex.index')
  local doc_details, err = indexer.get_document_details(document_id)
  if not doc_details then
    M.show_error("Document Error", {err or "Failed to get document details"})
    return nil
  end

  -- Create detail view
  local buffer = vim.api.nvim_create_buf(false, true)
  vim.api.nvim_buf_set_option(buffer, "filetype", "yaml")
  vim.api.nvim_buf_set_name(buffer, "notex://document-details")

  -- Generate detail content
  local lines = M.generate_document_details(doc_details)
  vim.api.nvim_buf_set_lines(buffer, 0, -1, false, lines)

  -- Create window
  local window = vim.api.nvim_open_win(buffer, true, {
    relative = "editor",
    width = math.min(100, vim.api.nvim_get_option_value("columns", {})),
    height = math.min(40, vim.api.nvim_get_option_value("lines", {})),
    row = 1,
    col = 1,
    border = "rounded",
    style = "minimal",
    title = " Document Details "
  })

  -- Setup mappings
  local mappings = {
    ["<CR>"] = {
      callback = function()
        vim.cmd('edit ' .. doc_details.document.file_path)
        vim.api.nvim_win_close(window, true)
      end,
      description = "Open document"
    },
    ["e"] = {
      callback = function()
        editor.start_edit_mode(buffer, 1, 1)
      end,
      description = "Edit properties"
    },
    ["q"] = {
      callback = function()
        vim.api.nvim_win_close(window, true)
      end,
      description = "Close"
    }
  }

  for key, action in pairs(mappings) do
    vim.keymap.set("n", key, action.callback, {
      buffer = buffer,
      noremap = true,
      silent = true
    })
  end

  return {
    buffer_id = buffer,
    window_id = window,
    type = "document_details",
    document_id = document_id
  }
end

-- Generate document details content
function M.generate_document_details(doc_details)
  local lines = {}

  -- Header
  table.insert(lines, "Document Details")
  table.insert(lines, string.rep("=", 50))
  table.insert(lines, "")

  -- File information
  table.insert(lines, "## File Information")
  table.insert(lines, string.format("Path: %s", doc_details.document.file_path))
  table.insert(lines, string.format("Created: %s", os.date("%Y-%m-%d %H:%M:%S", doc_details.document.created_at)))
  table.insert(lines, string.format("Modified: %s", os.date("%Y-%m-%d %H:%M:%S", doc_details.document.updated_at)))
  table.insert(lines, string.format("Content Hash: %s", doc_details.document.content_hash))
  table.insert(lines, string.format("File Exists: %s", doc_details.file_exists and "Yes" or "No"))
  table.insert(lines, "")

  -- Properties
  table.insert(lines, "## Properties")
  if doc_details.properties and #doc_details.properties > 0 then
    for _, prop in ipairs(doc_details.properties) do
      local value_str = tostring(prop.value)
      if #value_str > 100 then
        value_str = value_str:sub(1, 97) .. "..."
      end
      table.insert(lines, string.format("%s: %s (%s)", prop.key, value_str, prop.value_type))
    end
  else
    table.insert(lines, "No properties found")
  end
  table.insert(lines, "")

  -- Parse information
  if doc_details.parse_result and doc_details.parse_result.success then
    table.insert(lines, "## Analysis")
    local analysis = doc_details.parse_result.markdown_analysis
    table.insert(lines, string.format("Word Count: %d", analysis.word_count))
    table.insert(lines, string.format("Character Count: %d", analysis.character_count))
    table.insert(lines, string.format("Line Count: %d", analysis.line_count))
    table.insert(lines, string.format("Reading Time: %d minutes", analysis.reading_time_minutes))

    if #analysis.headings > 0 then
      table.insert(lines, "")
      table.insert(lines, "### Headings")
      for _, heading in ipairs(analysis.headings) do
        local indent = string.rep("  ", heading.level)
        table.insert(lines, indent .. heading.title)
      end
    end

    if #analysis.links > 0 then
      table.insert(lines, "")
      table.insert(lines, "### Links")
      for i, link in ipairs(analysis.links) do
        if i <= 5 then -- Limit to 5 links
          table.insert(lines, string.format("• %s → %s", link.text, link.url))
        end
      end
      if #analysis.links > 5 then
        table.insert(lines, string.format("... and %d more", #analysis.links - 5))
      end
    end
  end

  table.insert(lines, "")
  table.insert(lines, "Press <Enter> to open document, e to edit, q to close")

  return lines
end

-- Switch view type
function M.switch_view_type(new_view_type)
  local current_buffer = vim.api.nvim_get_current_buf()
  local success, result = view.switch_view_type(current_buffer, new_view_type)

  if success then
    vim.notify("Switched to " .. new_view_type .. " view", vim.log.levels.INFO)
  else
    vim.notify("Failed to switch view: " .. result, vim.log.levels.ERROR)
  end
end

-- Show view type menu
function M.show_view_type_menu()
  local view_types = view.get_available_view_types()
  local choices = {}

  for _, view_type in ipairs(view_types) do
    table.insert(choices, string.format("%s %s - %s", view_type.icon, view_type.name, view_type.description))
  end

  vim.ui.select(choices, {
    prompt = "Select view type:",
    format_item = function(item)
      return item
    end
  }, function(choice)
    if choice then
      -- Extract view type name from choice
      local view_type = choice:match("%s(%w+)%s-") or choice:match("(%w+)%s-")
      if view_type then
        M.switch_view_type(view_type)
      end
    end
  end)
end

-- Export view
function M.export_view(format)
  local current_buffer = vim.api.nvim_get_current_buf()
  local success, result = view.export_view(current_buffer, format)

  if success then
    -- Ask user for file location
    local default_filename = "notex_export." .. format
    vim.ui.input({ prompt = "Export to file: ", default = default_filename }, function(filename)
      if filename and filename ~= "" then
        local write_ok, write_err = utils.write_file(filename, result)
        if write_ok then
          vim.notify("Exported to " .. filename, vim.log.levels.INFO)
        else
          vim.notify("Failed to export: " .. write_err, vim.log.levels.ERROR)
        end
      end
    end)
  else
    vim.notify("Failed to export: " .. result, vim.log.levels.ERROR)
  end
end

-- Show export menu
function M.show_export_menu()
  local formats = {
    {name = "Markdown", extension = "md", description = "Markdown format"},
    {name = "CSV", extension = "csv", description = "Comma-separated values"},
    {name = "JSON", extension = "json", description = "JSON format"}
  }

  local choices = {}
  for _, format in ipairs(formats) do
    table.insert(choices, string.format("%s (%s) - %s", format.name, format.extension, format.description))
  end

  vim.ui.select(choices, {
    prompt = "Select export format:"
  }, function(choice)
    if choice then
      local format_name = choice:match("(%w+)%s+%(")
      if format_name then
        M.export_view(format_name:lower())
      end
    end
  end)
end

-- Show query prompt
function M.show_query_prompt(initial_query)
  initial_query = initial_query or ""

  vim.ui.input({
    prompt = "Query: ",
    default = initial_query,
    completion = "customlist,require('notex.ui').get_query_completions"
  }, function(query_string)
    if query_string and query_string ~= "" then
      M.execute_query_and_show_results(query_string)
    end
  end)
end

-- Execute query and show results
function M.execute_query_and_show_results(query_string, options)
  options = options or {}

  vim.notify("Executing query...", vim.log.levels.INFO)

  -- Execute query
  local result = query_engine.execute_query(query_string, options)

  if result.success then
    -- Show results
    local view_config = M.show_query_results(result, options)
    if view_config then
      utils.log("INFO", "Query executed successfully", {
        document_count = #result.documents,
        execution_time_ms = result.execution_time_ms
      })
    end
  else
    M.show_error("Query Failed", result.errors, options)
  end
end

-- Get query completions
function M.get_query_completions()
  local suggestions = query_engine.get_suggestions("", 0)

  local completions = {}

  -- Property suggestions
  for _, prop in ipairs(suggestions.properties or {}) do
    table.insert(completions, prop .. ":")
  end

  -- Value suggestions for common properties
  for prop, values in pairs(suggestions.values or {}) do
    for _, value in ipairs(values) do
      table.insert(completions, prop .. ' = "' .. value .. '"')
    end
  end

  -- Operator suggestions
  for _, op in ipairs(suggestions.operators or {}) do
    table.insert(completions, "WHERE " .. op)
  end

  table.sort(completions)

  return completions
end

-- Setup view cleanup
function M.setup_view_cleanup(view_config)
  local group = vim.api.nvim_create_augroup("NotexViewCleanup_" .. view_config.buffer_id, {clear = true})

  vim.api.nvim_create_autocmd({"BufLeave", "WinLeave"}, {
    buffer = view_config.buffer_id,
    once = true,
    callback = function()
      -- Give user time to interact, then cleanup
      vim.defer_fn(function()
        if vim.api.nvim_buf_is_valid(view_config.buffer_id) then
          ui_state.active_views[view_config.buffer_id] = nil
        end
      end, 1000)
    end
  })
end

-- Get UI status
function M.get_ui_status()
  local active_views = buffer_manager.get_active_buffers()
  local active_editors = editor.get_active_editors()

  return {
    active_views_count = vim.tbl_count(active_views),
    active_editors_count = vim.tbl_count(active_editors),
    total_windows = vim.tbl_count(vim.api.nvim_list_wins()),
    current_buffer = vim.api.nvim_get_current_buf(),
    current_window = vim.api.nvim_get_current_win()
  }
end

-- Cleanup all UI components
function M.cleanup_all()
  -- Close all notex buffers
  local buffers = vim.api.nvim_list_bufs()
  for _, buf in ipairs(buffers) do
    local buf_name = vim.api.nvim_buf_get_name(buf)
    if buf_name:match("^notex://") then
      if vim.api.nvim_buf_is_valid(buf) then
        vim.api.nvim_buf_delete(buf, {force = true})
      end
    end
  end

  -- Clear state
  ui_state.active_views = {}
  buffer_manager.cleanup_buffers()

  utils.log("INFO", "Cleaned up all UI components")
end

-- Initialize UI system
function M.init()
  -- Set up global keymaps if not already set
  local global_keymaps = {
    ["<leader>nq"] = {
      callback = function() M.show_query_prompt() end,
      description = "New query"
    },
    ["<leader>nv"] = {
      callback = function() M.show_view_type_menu() end,
      description = "Switch view type"
    },
    ["<leader>ne"] = {
      callback = function() M.show_export_menu() end,
      description = "Export view"
    }
  }

  for key, action in pairs(global_keymaps) do
    if not vim.fn.hasmapto(key, "n") then
      vim.keymap.set("n", key, action.callback, {
        noremap = true,
        silent = true,
        desc = action.description
      })
    end
  end

  utils.log("INFO", "UI system initialized")
  return true, "UI system initialized successfully"
end

return M