-- squad-injector/snapshot_lineup_tables.lua
-- FIFA Live Editor Lua script (v2 API).
--
-- Dumps every DB table whose name looks lineup/formation/squad-related,
-- full rows + fields, to a timestamped JSON file. Run it once BEFORE using
-- FLE's GUI "Freeze Lineup" feature (Formation Editor -> arrange players on
-- pitch -> tick "Freeze Lineup" -> Data -> Save) and once AFTER, then diff
-- the two snapshots with diff_snapshots.py to find which table/field(s) the
-- GUI feature actually writes.
--
-- This exists because "Freeze Lineup" is a confirmed, documented mechanism
-- for forcing a starting XI (FLE wiki: Formation-Editor.md) but it's GUI-only
-- — its underlying DB write is not documented anywhere. Diffing before/after
-- snapshots is how we find it, the same way export_squad.lua's exhaustive
-- table dump was the oracle for Track C.
--
-- Output: C:\FIFA 23 Live Editor\openfut_snapshot_<unix-ish timestamp>.json

local OUT_DIR = "C:\\FIFA 23 Live Editor\\"

-- Keyword filter, broader than squad-exporter's FUT-table filter — Freeze
-- Lineup is a formation/tactics feature so the write could land in any of
-- these families. "players" is included because position fields on the
-- player row itself may also change.
local KEYWORDS = { "squad", "lineup", "formation", "tactic", "teamsheet", "selection", "players", "teams" }

local function json_val(v)
    local t = type(v)
    if t == "nil" then return "null"
    elseif t == "boolean" then return tostring(v)
    elseif t == "number" then
        if v ~= v then return "null" end
        return string.format("%.6g", v)
    elseif t == "string" then
        return '"' .. v:gsub('\\', '\\\\'):gsub('"', '\\"'):gsub('\n', '\\n') .. '"'
    elseif t == "table" then
        local n = #v
        if n > 0 then
            local parts = {}
            for i = 1, n do parts[i] = json_val(v[i]) end
            return "[" .. table.concat(parts, ",") .. "]"
        else
            local parts = {}
            for k, vv in pairs(v) do
                parts[#parts + 1] = json_val(tostring(k)) .. ":" .. json_val(vv)
            end
            return "{" .. table.concat(parts, ",") .. "}"
        end
    end
    return "null"
end

local function export_table(tbl_name)
    local fields = GetDBTableFields(tbl_name) or {}
    local field_names = {}
    for _, f in ipairs(fields) do field_names[#field_names + 1] = f.name end

    local rows = GetDBTableRows(tbl_name)
    if not rows or #rows == 0 then
        Log("[snapshot] table '" .. tbl_name .. "': empty or not found")
        return { fields = field_names, rows = {} }
    end

    local out_rows = {}
    for _, row in ipairs(rows) do
        local rec = {}
        for _, fname in ipairs(field_names) do
            local cell = row[fname]
            if cell then rec[fname] = cell.value end
        end
        out_rows[#out_rows + 1] = rec
    end
    Log("[snapshot] table '" .. tbl_name .. "': " .. #out_rows .. " rows, " .. #field_names .. " fields")
    return { fields = field_names, rows = out_rows }
end

local all_table_names = GetDBTablesNames()
local matched = {}
for _, tname in ipairs(all_table_names) do
    local lower = tname:lower()
    for _, kw in ipairs(KEYWORDS) do
        if lower:find(kw) then
            matched[#matched + 1] = tname
            break
        end
    end
end

local snapshot = {
    captured_at = os.date("!%Y-%m-%dT%H:%M:%SZ"),
    is_career_mode = IsInCM(),
    matched_table_names = matched,
    tables = {},
}

for _, tname in ipairs(matched) do
    snapshot.tables[tname] = export_table(tname)
end

local out_path = OUT_DIR .. "openfut_snapshot_" .. os.date("!%Y%m%dT%H%M%SZ") .. ".json"
local f = io.open(out_path, "w")
if f then
    f:write(json_val(snapshot))
    f:close()
    Log("[snapshot] written to " .. out_path)
    MessageBox("OpenFUT Snapshot", "Snapshotted " .. #matched .. " tables.\n" .. out_path ..
        "\n\nTake one snapshot BEFORE Freeze Lineup, one AFTER, then run diff_snapshots.py on the two files.")
else
    Log("[snapshot] ERROR: could not open " .. out_path)
    MessageBox("OpenFUT Snapshot", "ERROR writing to " .. out_path)
end