export type FileData = string | Uint8Array;

export interface SourceLocation {
  line: number;
  label?: string;
  path?: string; // TODO: make mandatory?
  start?: number;
  end?: number;
}

// actually it's a kind of SourceSnippet .. can have multiple per line
export interface SourceLine extends SourceLocation {
  offset:number;
  insns?:string;
  iscode?:boolean;
  cycles?:number;
}

export class SourceFile {
  lines: SourceLine[];
  text: string;
  offset2loc: Map<number,SourceLine>; //{[offset:number]:number};
  line2offset: Map<number,number>; //{[line:number]:number};
  
  constructor(lines:SourceLine[], text:string) {
    lines = lines || [];
    this.lines = lines;
    this.text = text;
    this.offset2loc = new Map();
    this.line2offset = new Map();
    for (var info of lines) {
      if (info.offset >= 0) {
        this.offset2loc[info.offset] = info;
        this.line2offset[info.line] = info.offset;
      }
    }
  }
  // TODO: smarter about looking for source lines between two addresses
  findLineForOffset(PC:number, lookbehind:number) {
    if (this.offset2loc) {
      for (var i=0; i<=lookbehind; i++) {
        var loc = this.offset2loc[PC];
        if (loc) {
          return loc;
        }
        PC--;
      }
    }
    return null;
  }
  lineCount():number { return this.lines.length; }
}

export interface Dependency {
  path:string,
  filename:string,
  link:boolean,
  data:FileData // TODO: or binary?
}

export interface WorkerFileUpdate {
  path:string,
  data:FileData
};
export interface WorkerBuildStep {
  path?:string
  platform:string
  tool:string
  mainfile?:boolean
};

export interface WorkerMessage extends WorkerBuildStep {
  preload:string,
  reset:boolean,
  code:string,
  updates:WorkerFileUpdate[],
  buildsteps:WorkerBuildStep[]
}

export interface WorkerError extends SourceLocation {
  msg:string,
}

export interface CodeListing {
  lines:SourceLine[],
  asmlines?:SourceLine[],
  text?:string,
  sourcefile?:SourceFile,   // not returned by worker
  assemblyfile?:SourceFile  // not returned by worker
}

export type CodeListingMap = {[path:string]:CodeListing};

// TODO
export type VerilogOutput =
  {program_rom_variable:string, program_rom:Uint8Array, code:string, name:string, ports:any[], signals:any[]};

export type WorkerOutput = Uint8Array | VerilogOutput;

export type Segment = {name:string, start:number, size:number, last?:number, type?:string};

export interface WorkerResult {
  errors:WorkerError[]
  output?:WorkerOutput
  listings?:CodeListingMap
  symbolmap?:{[sym:string]:number}
  params?:{}
  segments?:Segment[]
  unchanged?:boolean
  debuginfo?:{} // optional info
}