#pragma once

#include "LibLsp/lsp/lsTextDocumentIdentifier.h"
#include "LibLsp/lsp/lsVersionedTextDocumentIdentifier.h"
#include "LibLsp/JsonRpc/RequestInMessage.h"
enum class HighlightingKind_clangD
{
    Variable = 0,
    LocalVariable,
    Parameter,
    Function,
    Method,
    StaticMethod,
    Field,
    StaticField,
    Class,
    Interface,
    Enum,
    EnumConstant,
    Typedef,
    Type,
    Unknown,
    Namespace,
    TemplateParameter,
    Concept,
    Primitive,
    Macro,

    // This one is different from the other kinds as it's a line style
    // rather than a token style.
    InactiveCode,

    LastKind = InactiveCode
};
std::string toSemanticTokenType(HighlightingKind_clangD kind);

enum class HighlightingModifier_clangD
{
    Declaration,
    Deprecated,
    Deduced,
    Readonly,
    Static,
    Abstract,
    DependentName,
    DefaultLibrary,

    FunctionScope,
    ClassScope,
    FileScope,
    GlobalScope,

    LastModifier = GlobalScope
};
std::string toSemanticTokenModifier(HighlightingModifier_clangD modifier);

enum SemanticTokenType
{
    ls_namespace = 0, // 'namespace',
    /**
         * Represents a generic type. Acts as a fallback for types which
         * can't be mapped to a specific type like class or enum.
         */
    ls_type, // 'type',
    ls_class, // 'class',
    ls_enum, // 'enum',
    ls_interface, // 'interface',
    ls_struct, // 'struct',
    ls_typeParameter, // 'typeParameter',
    ls_parameter, // 'parameter',
    ls_variable, // 'variable',
    ls_property, // 'property',
    ls_enumMember, // 'enumMember',
    ls_event, // 'event',
    ls_function, // 'function',
    ls_method, // 'method',
    ls_macro, // 'macro',
    ls_keyword, // 'keyword',
    ls_modifier, // 'modifier',
    ls_comment, // 'comment',
    ls_string, // 'string',
    ls_number, // 'number',
    ls_regexp, // 'regexp',
    ls_operator, // 'operator'
    lastKind = ls_operator
};
std::string to_string(SemanticTokenType);
unsigned toSemanticTokenType(std::vector<SemanticTokenType>& modifiers);

enum TokenType_JDT
{
    PACKAGE_JDT = 0,
    CLASS_JDT,
    INTERFACE_JDT,
    ENUM_JDT,
    ENUM_MEMBER_JDT,
    TYPE_JDT,
    TYPE_PARAMETER_JDT,
    ANNOTATION_JDT,
    ANNOTATION_MEMBER_JDT,
    METHOD_JDT,
    PROPERTY_JDT,
    VARIABLE_JDT,
    PARAMETER_JDT
};
std::string to_string(TokenType_JDT);

enum SemanticTokenModifier
{
    ls_declaration = 0, // 'declaration',
    ls_definition, // 'definition',
    ls_readonly, // 'readonly',
    ls_static, // 'static',
    ls_deprecated, // 'deprecated',
    ls_abstract, // 'abstract',
    ls_async, // 'async',
    ls_modification, // 'modification',
    ls_documentation, // 'documentation',
    ls_defaultLibrary, // 'defaultLibrary'
    LastModifier = ls_defaultLibrary
};
std::string to_string(SemanticTokenModifier);
unsigned toSemanticTokenModifiers(std::vector<SemanticTokenModifier>&);
/// Specifies a single semantic token in the document.
/// This struct is not part of LSP, which just encodes lists of tokens as
/// arrays of numbers directly.
struct SemanticToken
{
    /// token line number, relative to the previous token
    unsigned deltaLine = 0;
    /// token start character, relative to the previous token
    /// (relative to 0 or the previous token's start if they are on the same line)
    unsigned deltaStart = 0;
    /// the length of the token. A token cannot be multiline
    unsigned length = 0;
    /// will be looked up in `SemanticTokensLegend.tokenTypes`
    unsigned tokenType = 0;
    /// each set bit will be looked up in `SemanticTokensLegend.tokenModifiers`
    unsigned tokenModifiers = 0;
};
bool operator==(SemanticToken const&, SemanticToken const&);
struct SemanticTokens
{

    /**
        * Tokens in a file are represented as an array of integers. The position of each token is expressed relative to
        * the token before it, because most tokens remain stable relative to each other when edits are made in a file.
        *
        * ---
        * In short, each token takes 5 integers to represent, so a specific token `i` in the file consists of the following array indices:
        *  - at index `5*i`   - `deltaLine`: token line number, relative to the previous token
        *  - at index `5*i+1` - `deltaStart`: token start character, relative to the previous token (relative to 0 or the previous token's start if they are on the same line)
        *  - at index `5*i+2` - `length`: the length of the token. A token cannot be multiline.
        *  - at index `5*i+3` - `tokenType`: will be looked up in `SemanticTokensLegend.tokenTypes`. We currently ask that `tokenType` < 65536.
        *  - at index `5*i+4` - `tokenModifiers`: each set bit will be looked up in `SemanticTokensLegend.tokenModifiers`
        *
        * ---
        * ### How to encode tokens
        *
        * Here is an example for encoding a file with 3 tokens in a uint32 array:
        * ```
        *    { line: 2, startChar:  5, length: 3, tokenType: "property",  tokenModifiers: ["private", "static"] },
        *    { line: 2, startChar: 10, length: 4, tokenType: "type",      tokenModifiers: [] },
        *    { line: 5, startChar:  2, length: 7, tokenType: "class",     tokenModifiers: [] }
        * ```
        *
        * 1. First of all, a legend must be devised. This legend must be provided up-front and capture all possible token types.
        * For this example, we will choose the following legend which must be passed in when registering the provider:
        * ```
        *    tokenTypes: ['property', 'type', 'class'],
        *    tokenModifiers: ['private', 'static']
        * ```
        *
        * 2. The first transformation step is to encode `tokenType` and `tokenModifiers` as integers using the legend. Token types are looked
        * up by index, so a `tokenType` value of `1` means `tokenTypes[1]`. Multiple token modifiers can be set by using bit flags,
        * so a `tokenModifier` value of `3` is first viewed as binary `0b00000011`, which means `[tokenModifiers[0], tokenModifiers[1]]` because
        * bits 0 and 1 are set. Using this legend, the tokens now are:
        * ```
        *    { line: 2, startChar:  5, length: 3, tokenType: 0, tokenModifiers: 3 },
        *    { line: 2, startChar: 10, length: 4, tokenType: 1, tokenModifiers: 0 },
        *    { line: 5, startChar:  2, length: 7, tokenType: 2, tokenModifiers: 0 }
        * ```
        *
        * 3. The next step is to represent each token relative to the previous token in the file. In this case, the second token
        * is on the same line as the first token, so the `startChar` of the second token is made relative to the `startChar`
        * of the first token, so it will be `10 - 5`. The third token is on a different line than the second token, so the
        * `startChar` of the third token will not be altered:
        * ```
        *    { deltaLine: 2, deltaStartChar: 5, length: 3, tokenType: 0, tokenModifiers: 3 },
        *    { deltaLine: 0, deltaStartChar: 5, length: 4, tokenType: 1, tokenModifiers: 0 },
        *    { deltaLine: 3, deltaStartChar: 2, length: 7, tokenType: 2, tokenModifiers: 0 }
        * ```
        *
        * 4. Finally, the last step is to inline each of the 5 fields for a token in a single array, which is a memory friendly representation:
        * ```
        *    // 1st token,  2nd token,  3rd token
        *    [  2,5,3,0,3,  0,5,4,1,0,  3,2,7,2,0 ]
        * ```
        */
    std::vector<int32_t> data;
    static std::vector<int32_t> encodeTokens(std::vector<SemanticToken>& tokens);

    /**
         * An optional result id. If provided and clients support delta updating
         * the client will include the result id in the next semantic token request.
         * A server can then instead of computing all semantic tokens again simply
         * send a delta.
         */
    optional<std::string> resultId;
    MAKE_SWAP_METHOD(SemanticTokens, data, resultId)
};
MAKE_REFLECT_STRUCT(SemanticTokens, data, resultId)

/// Body of textDocument/semanticTokens/full request.
struct SemanticTokensParams
{
    /// The text document.
    lsTextDocumentIdentifier textDocument;
    MAKE_REFLECT_STRUCT(SemanticTokensParams, textDocument)
};
MAKE_REFLECT_STRUCT(SemanticTokensParams, textDocument)

/// Body of textDocument/semanticTokens/full/delta request.
/// Requests the changes in semantic tokens since a previous response.
struct SemanticTokensDeltaParams
{
    /// The text document.
    lsTextDocumentIdentifier textDocument;
    /**
         * The result id of a previous response. The result Id can either point to
         * a full response or a delta response depending on what was received last.
         */
    std::string previousResultId;

    MAKE_REFLECT_STRUCT(SemanticTokensDeltaParams, textDocument, previousResultId)
};
MAKE_REFLECT_STRUCT(SemanticTokensDeltaParams, textDocument, previousResultId)

/// Describes a a replacement of a contiguous range of semanticTokens.
struct SemanticTokensEdit
{
    // LSP specifies `start` and `deleteCount` which are relative to the array
    // encoding of the previous tokens.
    // We use token counts instead, and translate when serializing this struct.
    unsigned startToken = 0;
    unsigned deleteTokens = 0;
    std::vector<int32_t> tokens; // encoded as a flat integer array

    MAKE_REFLECT_STRUCT(SemanticTokensEdit, startToken, deleteTokens, tokens)
};
MAKE_REFLECT_STRUCT(SemanticTokensEdit, startToken, deleteTokens, tokens)

/// This models LSP SemanticTokensDelta | SemanticTokens, which is the result of
/// textDocument/semanticTokens/full/delta.
struct SemanticTokensOrDelta
{
    optional<std::string> resultId;
    /// Set if we computed edits relative to a previous set of tokens.
    optional<std::vector<SemanticTokensEdit>> edits;
    /// Set if we computed a fresh set of tokens.
    /// Set if we computed edits relative to a previous set of tokens.
    optional<std::vector<int32_t>> tokens; // encoded as integer array
    MAKE_REFLECT_STRUCT(SemanticTokensOrDelta, resultId, edits, tokens)
};
MAKE_REFLECT_STRUCT(SemanticTokensOrDelta, resultId, edits, tokens)

struct SemanticTokensLegend
{
    std::vector<std::string> tokenTypes;
    std::vector<std::string> tokenModifiers;
    MAKE_REFLECT_STRUCT(SemanticTokensLegend, tokenTypes, tokenModifiers)
};
MAKE_REFLECT_STRUCT(SemanticTokensLegend, tokenTypes, tokenModifiers)

DEFINE_REQUEST_RESPONSE_TYPE(
    td_semanticTokens_full, SemanticTokensParams, optional<SemanticTokens>, "textDocument/semanticTokens/full"
)
DEFINE_REQUEST_RESPONSE_TYPE(
    td_semanticTokens_full_delta, SemanticTokensDeltaParams, optional<SemanticTokensOrDelta>,
    "textDocument/semanticTokens/full/delta"
)