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from typing import List, Optional

from schemas import CodeTaskType, RetrievedEvidence


def clean_text(value: Optional[str], fallback: str = "None") -> str:
    if value is None:
        return fallback
    text = str(value).strip()
    return text if text else fallback


def format_evidence(evidence_list: Optional[List[RetrievedEvidence]]) -> str:
    if not evidence_list:
        return "No external technical evidence provided."

    lines = []
    for index, item in enumerate(evidence_list, start=1):
        lines.append(f"Source {index}")
        lines.append(f"Type: {item.source_type}")
        lines.append(f"Title: {item.title}")
        lines.append(f"Snippet: {item.snippet}")
        if item.url:
            lines.append(f"URL: {item.url}")
        if item.score is not None:
            lines.append(f"Score: {item.score}")
        lines.append("")

    return "\n".join(lines).strip()


def build_shared_context(
    message: str,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    code: Optional[str] = None,
    error_message: Optional[str] = None,
    previous_context: Optional[str] = None,
    evidence_list: Optional[List[RetrievedEvidence]] = None,
) -> str:
    parts = [
        f"User Request:\n{clean_text(message, '')}",
        f"Language:\n{clean_text(language, 'Not specified')}",
        f"Framework:\n{clean_text(framework, 'Not specified')}",
        f"Previous Context:\n{clean_text(previous_context, 'None')}",
        f"Error Message:\n{clean_text(error_message, 'None')}",
        f"Code:\n{clean_text(code, 'No code provided')}",
        f"Technical Evidence:\n{format_evidence(evidence_list)}",
    ]
    return "\n\n".join(parts)


def build_generate_prompt(
    message: str,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    previous_context: Optional[str] = None,
) -> str:
    shared = build_shared_context(
        message=message,
        language=language,
        framework=framework,
        previous_context=previous_context,
    )

    return (
        "You are a senior software engineer.\n"
        "Your task is to generate code based on the user's request.\n"
        "Follow these rules:\n"
        "1. Generate clean, correct, production-style code.\n"
        "2. Match the requested language and framework if provided.\n"
        "3. If the language or framework is missing, infer a reasonable default from the request.\n"
        "4. Keep the explanation concise and practical.\n"
        "5. Return code that is directly usable.\n"
        "6. Do not include unnecessary long prose.\n"
        "7. Do not include multiple alternative implementations unless the user asks.\n"
        "8. Do not add unrelated features or speculative improvements.\n\n"
        f"{shared}\n\n"
        "Output Format:\n"
        "Explanation:\n"
        "<one short explanation>\n\n"
        "Code:\n"
        "<generated code>"
    )


def build_fix_prompt(
    message: str,
    code: Optional[str] = None,
    error_message: Optional[str] = None,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    previous_context: Optional[str] = None,
    evidence_list: Optional[List[RetrievedEvidence]] = None,
) -> str:
    shared = build_shared_context(
        message=message,
        language=language,
        framework=framework,
        code=code,
        error_message=error_message,
        previous_context=previous_context,
        evidence_list=evidence_list,
    )

    return (
        "You are a senior software engineer and debugging expert.\n"
        "Your task is to fix the user's code.\n"
        "Follow these rules:\n"
        "1. Identify the most likely root cause.\n"
        "2. Preserve the user's intended logic where possible.\n"
        "3. Use the provided technical evidence if relevant.\n"
        "4. If the error details are incomplete, make the safest reasonable fix and mention assumptions.\n"
        "5. Make the minimum necessary changes to solve the issue.\n"
        "6. Do not change variable names, function names, class names, signatures, public interfaces, or structure unless absolutely necessary.\n"
        "7. Do not rewrite unrelated parts of the code.\n"
        "8. Return corrected code that is directly usable.\n"
        "9. Keep the explanation concise and practical.\n\n"
        f"{shared}\n\n"
        "Output Format:\n"
        "Root Cause:\n"
        "<one short root cause>\n\n"
        "Explanation:\n"
        "<clear but concise explanation>\n\n"
        "Code:\n"
        "<fixed code>"
    )


def build_explain_prompt(
    message: str,
    code: Optional[str] = None,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    previous_context: Optional[str] = None,
) -> str:
    shared = build_shared_context(
        message=message,
        language=language,
        framework=framework,
        code=code,
        previous_context=previous_context,
    )

    return (
        "You are a senior software engineer.\n"
        "Your task is to explain the user's code or technical question clearly.\n"
        "Follow these rules:\n"
        "1. Explain in a simple and structured way.\n"
        "2. Focus on the most important logic.\n"
        "3. If code is provided, explain what it does, why it works, and any important edge cases.\n"
        "4. Keep the explanation practical and concise.\n"
        "5. Do not output changed code unless the user explicitly asks for changes.\n"
        "6. Do not rewrite the code.\n\n"
        f"{shared}\n\n"
        "Output Format:\n"
        "Explanation:\n"
        "<clear structured explanation>"
    )


def build_refactor_prompt(
    message: str,
    code: Optional[str] = None,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    previous_context: Optional[str] = None,
) -> str:
    shared = build_shared_context(
        message=message,
        language=language,
        framework=framework,
        code=code,
        previous_context=previous_context,
    )

    return (
        "You are a senior software engineer.\n"
        "Your task is to refactor the user's code.\n"
        "Follow these rules:\n"
        "1. Preserve the original behavior unless the user explicitly asked for functional changes.\n"
        "2. Preserve all existing function names, class names, method names, parameters, argument order, return behavior, and public interfaces.\n"
        "3. You must keep the original callable names exactly the same.\n"
        "4. Do not rename variables, parameters, functions, classes, or methods unless absolutely necessary.\n"
        "5. Improve readability, maintainability, and structure only.\n"
        "6. If the code is already simple and acceptable, make only minimal improvements.\n"
        "7. Do not rewrite unrelated sections.\n"
        "8. Return improved code that remains easy to compare with the original.\n\n"
        f"{shared}\n\n"
        "Output Format:\n"
        "Explanation:\n"
        "<short explanation>\n\n"
        "Code:\n"
        "<refactored code>"
    )


def build_review_prompt(
    message: str,
    code: Optional[str] = None,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    previous_context: Optional[str] = None,
) -> str:
    shared = build_shared_context(
        message=message,
        language=language,
        framework=framework,
        code=code,
        previous_context=previous_context,
    )

    return (
        "You are a senior software engineer performing a code review.\n"
        "Your task is to review the user's code and identify issues or improvements.\n"
        "Follow these rules:\n"
        "1. Focus on correctness, readability, maintainability, edge cases, and possible bugs.\n"
        "2. Be specific and practical.\n"
        "3. Prefer review comments and suggestions over rewriting the code.\n"
        '4. Only provide improved code if a small correction is truly necessary and helpful.\n'
        '5. If no rewrite is necessary, do not include a "Code" section.\n'
        "6. Keep the output review-oriented, not refactor-oriented.\n"
        "7. Mention important risks and concrete suggestions.\n\n"
        f"{shared}\n\n"
        "Output Format:\n"
        "Review:\n"
        "<review points>\n\n"
        "Suggestions:\n"
        "<practical suggestions>\n\n"
        "Code:\n"
        "<optional improved code only if needed>"
    )


def build_prompt(
    task_type: CodeTaskType,
    message: str,
    code: Optional[str] = None,
    error_message: Optional[str] = None,
    language: Optional[str] = None,
    framework: Optional[str] = None,
    previous_context: Optional[str] = None,
    evidence_list: Optional[List[RetrievedEvidence]] = None,
) -> str:
    if task_type == CodeTaskType.GENERATE:
        return build_generate_prompt(
            message=message,
            language=language,
            framework=framework,
            previous_context=previous_context,
        )

    if task_type == CodeTaskType.FIX:
        return build_fix_prompt(
            message=message,
            code=code,
            error_message=error_message,
            language=language,
            framework=framework,
            previous_context=previous_context,
            evidence_list=evidence_list,
        )

    if task_type == CodeTaskType.EXPLAIN:
        return build_explain_prompt(
            message=message,
            code=code,
            language=language,
            framework=framework,
            previous_context=previous_context,
        )

    if task_type == CodeTaskType.REFACTOR:
        return build_refactor_prompt(
            message=message,
            code=code,
            language=language,
            framework=framework,
            previous_context=previous_context,
        )

    if task_type == CodeTaskType.REVIEW:
        return build_review_prompt(
            message=message,
            code=code,
            language=language,
            framework=framework,
            previous_context=previous_context,
        )

    return build_explain_prompt(
        message=message,
        code=code,
        language=language,
        framework=framework,
        previous_context=previous_context,
    )