using System.Collections.Generic;

namespace LaDOSE.Entity
{
    /// <summary>
    /// One spreadsheet write: the tables to put in it, and which spreadsheet.
    /// Not an entity — never mapped by EF. It arrives as SheetExportRequestDTO and is
    /// mapped by AutoMapper, same pattern as <see cref="MatchStats"/>, so property names
    /// must stay identical to the DTO's.
    ///
    /// The tables are built client-side by $lib/tournaments/cumulative.ts, which reuses the
    /// very same buildRanking() that produces the CSV export. That is deliberate: the sheet
    /// and the CSV cannot drift because one function produces both.
    /// </summary>
    public class SheetExportRequest
    {
        /// <summary>
        /// Resolved by SheetsExportService from configuration — never supplied by the caller,
        /// so a client cannot aim the export at someone else's spreadsheet.
        /// </summary>
        public string SpreadsheetId { get; set; }

        /// <summary>
        /// One tab per selected event, oldest first. Tab N holds events 1..N merged, so the
        /// last tab is the full cumulative ranking for the scope.
        /// </summary>
        public List<SheetTable> Tabs { get; set; } = new List<SheetTable>();
    }

    /// <summary>One tab: a players x games grid with a Total column.</summary>
    public class SheetTable
    {
        /// <summary>Desired tab title, e.g. "Ranking #1301". Sanitised before use.</summary>
        public string Name { get; set; }

        /// <summary>
        /// Provenance and logging only. Tabs are addressed by title, never by this — see the
        /// note on tab identity in SheetsExportService.
        /// </summary>
        public int EventId { get; set; }

        /// <summary>["Players", &lt;game names...&gt;, "Total"].</summary>
        public List<string> Header { get; set; } = new List<string>();

        public List<SheetRow> Rows { get; set; } = new List<SheetRow>();

        /// <summary>
        /// Written below the grid, one line per entry, blank row in between. Carries which
        /// events went into this tab so a stale or incomplete tab identifies itself.
        /// </summary>
        public List<string> Footer { get; set; } = new List<string>();
    }

    public class SheetRow
    {
        public string Player { get; set; }

        /// <summary>Index-aligned with Header[1..^1] — one entry per game column.</summary>
        public List<int> Points { get; set; } = new List<int>();

        public int Total { get; set; }
    }

    public class SheetExportResult
    {
        public string SpreadsheetId { get; set; }
        public string SpreadsheetUrl { get; set; }

        /// <summary>Which ISheetsWriter did the work — "ServiceAccount", "Logging", ...</summary>
        public string Writer { get; set; }

        public List<SheetTabResult> Tabs { get; set; } = new List<SheetTabResult>();

        /// <summary>Anything the user should know but that did not stop the write, e.g. renames.</summary>
        public List<string> Warnings { get; set; } = new List<string>();
    }

    public class SheetTabResult
    {
        /// <summary>The title as asked for, before sanitisation.</summary>
        public string RequestedName { get; set; }

        /// <summary>The title actually written to.</summary>
        public string Name { get; set; }

        public int Rows { get; set; }
        public int Columns { get; set; }

        /// <summary>False when an existing tab of that name was rewritten in place.</summary>
        public bool Created { get; set; }
    }

    /// <summary>What the UI needs to render the export panel. Never carries a secret.</summary>
    public class SheetsConfig
    {
        public string Writer { get; set; }

        /// <summary>The writer has its credentials and a target spreadsheet is configured.</summary>
        public bool Configured { get; set; }

        public string SpreadsheetId { get; set; }
        public int MaxTabs { get; set; }
        public int MaxRowsPerTab { get; set; }
    }

    /// <summary>
    /// Server-side limits and the target spreadsheet, read from the GoogleSheets configuration
    /// section. Constructor-injected rather than IOptions, matching how the Challonge and Smash
    /// providers take their keys.
    /// </summary>
    public class SheetsSettings
    {
        /// <summary>
        /// The spreadsheet everything is written to. Reset each year — see .env.example.
        /// </summary>
        public string SpreadsheetId { get; set; }

        public int MaxTabs { get; set; } = 60;
        public int MaxRowsPerTab { get; set; } = 5000;

        /// <summary>Google caps a tab at 100 chars; this caps the grid width.</summary>
        public int MaxColumns { get; set; } = 200;
    }
}